30 results about "Condenser (laboratory)" patented technology

The invention discloses a multipurpose small rectification system for a laboratory. The multipurpose small rectification system comprises a feeding device and a rectification tower connected to the feeding device in series. The top of the rectification tower is orderly connected to a condenser and a return tank. A liquid outlet end of the return tank is connected to two pipes, one of the two pipes is provided with a return pump, has a liquid outlet end connected to the top of the rectification tower and is a return pipe, and the other one of the two pipes is connected to a top material tank and is a product pipe. A material outlet at the tower bottom is orderly connected to a bottom material pump and a bottom material tank by pipes. The rectification tower comprises a tower bottom, a tower body and the top of the tower. The tower bottom is connected to the bottom end of the tower body. The top of the tower is connected to the top end of the tower body. The tower body comprises multiple tower sections, each two adjacent tower sections are detachably connected by a connection section, and each one of the tower sections is filled with a filling material. The multipurpose small rectification system can realize industrial production-simulative continuous rectification in a limited space of a laboratory, can carry out a normal-pressure vacuum rectification test, a common continuous rectification test and an extraction rectification test and satisfies requirements on a plurality of tests in the laboratory.

The invention discloses a temperature and humidity working condition adjusting system, which comprises a compressor, a condenser, a throttling valve, a dehumidifying coil, a sensible heat coil, a hot air bypass loop, a humidifying device, a heating device and a temperature and humidity controller, wherein the dehumidifying coil, the sensible heat coil, the compressor, the condenser and the throttling valve are connected end to end in sequence through a conduit to form a main loop; the hot air bypass loop is connected between an outlet of the compressor and an inlet of the sensible heat coil; and the throttling valve, the hot air bypass loop, the humidifying device and the heating device are connected with the temperature and humidity controller respectively. According to the temperature and humidity working condition adjusting system, the adjustability of four working conditions is realized through dehumidification of the hot air bypass loop, cooling adjustment of the throttling valve and the conventional heating and humidifying treatment, the useless cold and dehumidification capacity of the working condition adjusting unit are reduced to the greatest extent, and the aim of reducing operation energy consumption is fulfilled, so that the annual operation energy consumption of a constant temperature and constant humidity laboratory during use of the system can be saved by over 30 percent.

The invention relates to the technical field of laboratory humidity detection devices, and discloses a laboratory humidity detection device with a humidity adjusting function. The laboratory humiditydetection device comprises an indoor cabinet and an outdoor cabinet. A ventilation hole is formed in the top of the indoor cabinet. An evaporator and a water collection case located below the evaporator are fixedly connected in the indoor cabinet. An expansion valve communicating with the right side of the evaporator and a condenser communicating with the right side of the expansion valve are fixedly connected in the outdoor cabinet. A compressor communicating with the left side of the condenser and communicating with the bottom of the evaporator is fixedly connected in the outdoor cabinet. The laboratory humidity detection device with the humidity adjusting function has the advantage of having the humidity adjusting function, and the problems that a constant-temperature and constant-humidity laboratory has the advantage that humidity distribution is more uniform but has no humidity adjusting function, when the humidity of the laboratory is too high, reagents and other objects are prone to going mouldy, and the experiment progress is influenced are solved.

The invention relates to a soil in-situ thermal desorption experiment simulation device, which is characterized in that a stainless steel box body is filled with polluted soil to be tested and is provided with a heating pipe and an extraction pipe; and the heating process of the polluted soil to be tested is adjusted by a digital control system, so that pollutants in the soil are heated and desorbed and are extracted by the extraction pipe; temperature and heat flux data of all positions of soil in the heating desorption process are collected by a temperature sensor and a heat flux sensor andare automatically recorded in a combined computer system, and after a pollutant gas-liquid phase mixture passes through a condenser and a gas-liquid separator, a liquid phase obtained through separation is collected into a water tank to be detected and treated. A gas phase obtained by separation passes through an activated carbon adsorption device and can be normally discharged after the concentration of pollutants in the gas phase is detected to reach the standard. Accurate laboratory simulation is carried out on the in-situ thermal desorption pollution treatment process of an actual pollutedsite, and theoretical and data references are provided for site layout, process parameter determination and other aspects in subsequent engineering application.

The invention provides a process equipment and control engineering comprehensive experiment system. The process equipment and control engineering comprehensive experiment system includes a boiler, a compressor, an expander, a heat exchanger, a condenser, a centrifugal pump and a control box, wherein during the operating process, a cycle fluid and a condenser heat exchange medium take part in the process; the boiler heats the liquid cycle fluid into the steam state; the compressor pressurizes the gaseous state cycle fluid; the expander enables the cycle fluid to do work by expansion; the heat exchanger and the condenser perform condensation cooling on the gaseous state cycle fluid; the centrifugal pump pressurizes the cycle fluid, and sends the cycle fluid to the boiler; and the control boxis used to monitor and control the whole experiment equipment. The process equipment and control engineering comprehensive experiment system is miniature, and various devices in the experiment systemare put in a laboratory. The process equipment and control engineering comprehensive experiment system does not need providing extra heat sources for evaporation of cycle fluid, and is convenient foroperation of the experiment process by electrically heating the cycle fluid. The process equipment and control engineering comprehensive experiment system can achieve the aim of cycling fluid steam at the entrance of the expander generating the specified state parameters in a mode of combining the boiler and the compressor.

The invention discloses a multi-split VOC laboratory freezing control system. The system comprises a test zone and a freezing zone. At least two VOC laboratories are arranged in the test zone. Each one of the VOC laboratories comprises a test chamber jacket and a test chamber. Each one of the test chamber jackets is provided with a gas inlet and a gas outlet. A compressor, a condenser, a throttle valve and an evaporator are arranged in the freezing zone. An outlet of the freezing zone is connected to a gas inlet of each one of the test chamber jackets through an air outlet duct in parallel. The air outlet duct is provided with a blower. An inlet of the freezing zone is connected to a gas outlet of each one of the test chamber jackets through an air inlet duct in parallel. The gas inlet and the gas outlet of each one of the test chamber jackets are respectively provided with switch valves. According to the system, multiple VOC laboratories share one freezing control mechanism so that a space and a cost are saved. The system is suitable for simultaneous operation of VOC laboratories and individual operation of a VOC laboratory and can be conveniently used.

The invention provides a barrel pump refrigerating system. The system comprises a liquid storage barrel, a first pump and a first evaporator which are sequentially and circularly connected to form a first cycle and a first pressure regulating valve, a compressor and a condenser. The first pump is a fluorine pump. The first pressure regulating valve, the compressor, the condenser and the liquid storage barrel are sequentially and circularly connected to form a second cycle. Through the design of the barrel pump refrigerating system, the evaporation temperature higher than 15 DEG C can be formedin the first evaporator, so that under the working conditions of high temperature and high humidity, the refrigerating system does not generate redundant dehumidification spontaneously, the air humidity can be prevented from being too low, a large amount of humidification compensation is avoided, and the operation energy consumption of a laboratory is reduced.

According to an energy-saving enthalpy difference laboratory provided by the invention, through the design of a barrel pump refrigeration system, the evaporation temperature of 15 DEG C or above can be formed on a first evaporator and a second evaporator, so that under the working conditions of high temperature and high humidity, the refrigeration system cannot spontaneously generate redundant dehumidification, and the excessively low air humidity can be prevented, thereby avoiding a large amount of humidification compensation; when the outdoor temperature is low, different evaporation temperatures can be formed indoors and outdoors for cooling through a liquid storage barrel; meanwhile, the room is subjected to heating regulation through heat of a second condenser and a third condenser, so as to take the heat recovery effect and avoid investment of electric heating; and by ultrasonic humidifiers on the indoor side and the outdoor side, the problem of redundant heat of electric humidification is avoided according to the principle of isenthalpic humidification, and the energy-saving effect of the laboratory is greatly improved.

The invention discloses a laboratory air tritium removal system and relates to the technical field of tritium removal purification. The system includes a closable laboratory, wherein the tritium leakage monitoring system is used for monitoring the content of tritium in the closable laboratory; the air tritium removal system is used for treating tritium-containing waste hydrogen; an air inlet and an air outlet of the air tritium removal system are both communicated with the interior of the sealable laboratory; the air tritium removal system sequentially comprises a filter, a refrigeration dryer, a drying bed, a catalytic oxidation bed, a condenser and an adsorption bed from an air inlet to an air outlet, wherein the fan is arranged at any position of air path circulation, and the tritium leakage monitoring system is in signal connection with the fan and a control system capable of sealing a laboratory sealing door. According to the laboratory air tritium removal system, moisture in airis removed firstly, then gaseous tritium and trace organic tritium in waste gas are oxidized into tritiated water through catalytic oxidation, an adsorption bed is adopted for absorbing tritiated water vapor, and the air ,after tritium removal, is subjected to circulation treatment till the air reaches the standard.

The invention discloses a secondary distilled water device in a laboratory, which comprises a first distillation bottle, a second distillation bottle, a first condensation pipe, a second condensation pipe and a collection bottle, and the first distillation bottle and the second distillation bottle are equipped with The water inlet and steam outlet, the first condensing pipe and the second condensing pipe are respectively connected and docked with the first distillation bottle and the second distillation bottle, the distilled water outlet of the first condensing pipe is connected with the second distillation bottle, and the distilled water of the second condensing pipe The outflow port is communicated with the collecting bottle, and the collecting bottle is placed in a water bath dish, and the water bath dish is communicated with the first distillation bottle. With the present invention, the seamless connection between two distillation operations can be realized, the intermediate links can be reduced, the operation steps can be simplified, and the operation time can be shortened, thereby greatly improving work efficiency and reducing work intensity, and the distillation products during use and the cooling after heat exchange The thermal energy of water has been utilized, which improves the comprehensive utilization rate of materials and energy.

The invention relates to the technical field of laboratory humidity detection devices, and discloses a laboratory humidity detection device with a humidity adjustment function, which includes an indoor cabinet and an outdoor cabinet, the top of the indoor cabinet is provided with ventilation holes, and the indoor cabinet has a ventilation hole. An evaporator and a water collection box located below the evaporator are fixedly connected inside. An expansion valve communicating with the right side of the evaporator and a condenser communicating with the right side of the expansion valve are respectively fixedly connected inside the outdoor cabinet. The interior of the cabinet is fixedly connected with a compressor communicating with the left side of the condenser and communicating with the bottom of the evaporator. The laboratory humidity detection device with humidity adjustment function has the advantages of humidity adjustment function and solves the problem that the constant temperature and humidity laboratory has the advantage of making the humidity distribution more uniform, but it does not have the humidity adjustment function. When the humidity in the laboratory is too high, It is easy to cause mildew on reagents and other items, which will affect the progress of the experiment.

The invention discloses an energy-saving method applied to temperature control and humidity control of an air conditioning enthalpy difference laboratory, and belongs to the technical field of temperature control and humidity control of laboratories. The energy-saving method comprises the following steps of firstly, dividing an evaporator of an air handling unit into a dehumidification evaporatorand a cooling evaporator to divide circulating air into two parts; secondly, enabling the dehumidification evaporator to be connected with an auxiliary condensation compression system; thirdly, enabling the cooling evaporator to be connected with the auxiliary condensation compression system, wherein two air inlet pipelines are arranged, one air inlet pipeline is connected with a condenser, and the other air inlet pipeline is connected with an exhaust port of a compressor, wherein an expansion valve is arranged on the air inlet pipeline connected with the condenser, and an energy regulating valve is arranged on the air inlet pipeline connected with the exhaust port of the compressor; and fourthly, forming control logic similar to cascade regulation by using the control signal of the energyregulating valve in the step 3 and the input signal of an electric heating power regulator for dry bulb temperature control, and completing process parameter control regulation by using two sets of actuators. The method is reasonable in design and suitable for optimal design for a control system of the air conditioning enthalpy difference laboratory.

The invention relates to an air-conditioning and ventilation system for a laboratory, which includes an air-conditioning box and a refrigerating unit, the refrigerating unit includes an evaporator, a condenser, a compressor and an electronic expansion valve, and a cooler and a heater are arranged in the air-conditioning box; wherein, During cooling, the cold water is cooled by the evaporator and sent to the cooler, and the cooled air is treated to the point where the cold air is sent; during heating, the fresh water is heated by the condenser and then sent to the heater, and the heated air is treated to At the state point of hot air supply, the treated air is sent to the laboratory by the fan section of the air conditioning box. The invention realizes the independent adjustment of indoor temperature and humidity, precisely controls indoor parameters, and improves the air quality of the air supply; the invention has outstanding energy-saving effects and increases the efficiency of the unit; the air supply and return mode of the invention adopts the air supply side of the orifice plate to send back and forth, and the noise is small , the temperature field and velocity field are uniform, the temperature gradient is small, and the air supply is directly sent to the work area, which ensures the air quality and comfort requirements of the experimenter's work area.

The invention provides a two-way temperature control circulating liquid supply system of laboratory equipment and a control method of the two-way temperature control circulating liquid supply system. The two-way temperature control circulating liquid supply system comprises a first loop used for providing low-temperature circulating liquid for a low-temperature medium cooling device set in a test room, a second loop used for providing normal-temperature circulating liquid for a normal-temperature medium cooling device set in the test room, and a two-temperature circulating water unit connected between the first loop and the second loop. The double-temperature circulating water unit comprises a normal-temperature medium heat exchange tank, a low-temperature medium heat exchange pipe and a low-temperature medium heat exchange tank, the middle of the low-temperature medium heat exchange pipe is located in the normal-temperature medium heat exchange tank, two ports of the low-temperature medium heat exchange pipe are communicated with the low-temperature medium heat exchange tank, and valves are arranged at the ends of the low-temperature medium heat exchange pipe respectively. The double-temperature circulating water unit further comprises a compressor, a condenser, a throttling valve and an evaporator which are communicated with one another, the evaporator is located in the low-temperature medium heat exchange tank, and the condenser is located in the normal-temperature medium heat exchange tank. The cooling efficiency is high, the integration degree is high, the control precision is high, and the application effect is remarkable.

The invention discloses a novel fused salt heat absorber. The novel fused salt heat absorber comprises a distributing header, communicating pipes, heat absorbing pipes, an inlet header, an outlet header and a middle header. The distributing header is connected with the inlet header through the communicating pipes, and the inlet header and the outlet header are of an integrated structure and separated through a partition in the middle. The inlet header and the outlet header are connected through the heat absorbing pipes. The heat absorbing pipes comprise the upper row of heat absorbing pipes and the lower row of heat absorbing pipes. The upper row of heat absorbing pipes and the lower row of heat absorbing pipes are connected through the middle header. The novel fused salt heat absorber iscompact in structure and is close to a real object, the heat radiation absorption rate of the heat absorber for a solar simulative condenser matched in a laboratory is increased as much as possible, meanwhile, the feasibility of manufacturing and machining is considered, preventive measures are taken for the characteristic that fused salt is easily solidified, the situation that the fused salt isaccumulated in the heat absorber when the fused salt is in a cold state is avoided, enough temperature measuring instrument interfaces are reserved in the inlet header, the outlet header and the middle header, and therefore the condition is provided for following experiment fused salt temperature acquisition.

The invention discloses an evaporative condenser performance test method and a system thereof, and the test system mainly consists of the following parts: a test room, a main refrigeration system, an auxiliary air conditioning system, a room heat recovery system, an acquisition system and a control system. The test room is a closed space, a maintenance structure is subjected to heat preservation and damp-proof treatment, and a drainage system is arranged in the test room. According to the method, the heat transfer performance of the evaporative condenser under different environmental conditions can be tested, the heat transfer performance of the evaporative condenser under different working conditions is tested, the method has important guiding significance on engineering design and model selection, the heat recovery system is adopted to recover heat of a room and cold of the main refrigeration system, a high-capacity cooling system does not need to be additionally arranged in the test room to maintain the working condition, so that the construction cost and the operation cost of a laboratory can be greatly reduced.

The invention discloses a tail gas purification device for an activated carbon laboratory test activation furnace, and relates to the field of tail gas treatment of small test instruments. The devicemainly comprises a tail gas buffer (3), a steam-water separator, a condenser and a tail gas purifier, wherein the tail gas buffer (3) comprises a tail gas inlet pipe (1) and an explosion-proof valve (2); the steam-water separator (5) comprises a gas pipe (4) and a filling material (6); the condenser (9) comprises a condensate gas inlet pipe (8), a condensate gas outlet pipe (15), a condensate water inlet pipe (14) and a water outlet pipe (7); the tail gas purifier comprises a purifier filling material (10), a separation net (11), a draught fan (12) and a purified gas outlet pipe (13). The tailgas buffer, the steam-water separator, the condenser and the purifier of the device are integrally designed, and tail gas of the activated carbon lab-scale activation furnace is purified by cooling and then purifying. The device is detachable, and filling materials can be replaced. The design defect that tail gas of an existing activated carbon small-scale activation furnace cannot be treated isovercome, the hidden danger that the tail gas of the activated carbon small-scale activation furnace pollutes seriously and harms the health of detection personnel can be effectively avoided, the problem that activated carbon activation tail gas in a laboratory is difficult to treat is solved, and the purpose of environment-friendly detection is achieved.

The invention provides a condensation temperature controllable dew point corrosion evaluation device, which comprises a heating device (1), a container (2), a hollow corrosion element (3), a sealing cover (4), a condensation pipe (8), an anti-suck-back bottle (10), a tail gas absorption bottle (11), a constant temperature circulation device and a direct current resistance measuring instrument, and is characterized in that the container (2) is heated by the heating device (1), and the sealing cover (4) seals the container (2); the hollow corrosion element (3) and the condensation pipe (8) are arranged on the sealing cover (4), the condensation pipe (8) is communicated with the suck-back prevention bottle (10) through the guide pipe (9), and the suck-back prevention bottle (10) is communicated with the tail gas absorption bottle (11). By establishing the dew point corrosion evaluation device, the dew point corrosion resistance of the material can be evaluated in a laboratory; the surface temperature of the sample can be accurately controlled, and the dew point corrosion resistance of the material at a specific temperature can be evaluated; and the dew point corrosion resistance of the material can be evaluated in real time.

The invention relates to the technical field of separation and purification, and particularly discloses a laboratory biochemical engineering gas separation and purification device, which comprises a condenser, wherein an air inlet is formed in the top of the condenser, the side surface of the condenser communicates with a reflux upper pipe, the condenser is fixedly mounted at the top of a tower top tank, the bottom surface of the tower top tank is funnel-shaped, a liquid outlet is formed in the bottom end of the tower top tank, a tower body is fixedly connected to the bottom of the tower top tank, the liquid outlet is inserted into the top opening of the tower body, the tower kettle is fixedly connected to the bottom of the tower body, a liquid discharging port is formed in the bottom of the tower kettle, and the side surface of the tower kettle is communicated with a reflux lower pipe, the reflux lower pipe is communicated with the reflux upper pipe, a solvent is contained in the tower kettle, and a steam generator is communicated to the side wall of the tower kettle. According to the invention, a seat of a low-temperature rectification system suitable for laboratory research operation is formed by arranging all the components, wherein the structure is simple, the process is reasonable, the operation difficulty is low, the energy consumption is low, and the purity and the efficiency of separation and purification are guaranteed.

A barrel pump refrigeration system, comprising: a liquid storage barrel, a first pump and a first evaporator connected in sequence in a cycle to form a first cycle; the first pump is a fluorine pump; a first pressure regulating valve, a compressor, a condenser, The liquid storage tank, the first pressure regulating valve, the compressor and the condenser are connected cyclically in sequence to form a second cycle. Through the design of the barrel pump refrigeration system, the present invention can form an evaporation temperature above 15°C in the first evaporator, so that under the working conditions of high temperature and high humidity, the refrigeration system will not spontaneously generate redundant dehumidification, which can prevent the air humidity from being too low. , so as to avoid a large amount of humidification compensation and reduce the energy consumption of laboratory operation.

The invention discloses a material isothermal heating system for a laboratory. The material isothermal heating system comprises a heating furnace and a carrier gas circulating system; an external carrier gas source communicates with a carrier gas inlet of the heating furnace through a first carrier gas valve and a second carrier gas valve in sequence; the carrier gas circulating system comprises a gas compressor, a gas storage bag, a filter and a condenser, and a carrier gas outlet of the heating furnace is connected between the two carrier gas valves through the condenser, the filter and the gas compressor in sequence; and an emptying valve and a gas inlet valve of the gas storage bag are also connected between the filter and the gas compressor. According to the system, materials are heated through convection heat exchange by utilizing hot carrier gas, meanwhile, the furnace wall with the same temperature as the carrier gas heats the materials through radiation at the same time, the temperature rise uniformity of the materials is improved, and the heating efficiency of the materials is improved.

The invention belongs to the technical field of laboratory instruments and equipment, and particularly relates to a self-air-return digestion device which comprises a heating device, a heat transfer medium groove is formed in the heating device, a container containing hole is formed in the top end of the heating device, a sealing cover is detachably placed above the heating device, and the heat transfer medium groove is located in the sealing cover. The multiple condensation pipes are inserted into openings in the top ends of the multiple digestion containers respectively, the exhaust pipeline is communicated with the lower end of the air return pipe, the upper portion of the air return pipe is communicated with the upper end of the air adding pipe, and the lower end of the air adding pipe penetrates through the condensation pipes and extends into the digestion containers. Compared with the prior art, volatile gas can be exhausted through the exhaust pipeline on the sealing cover, so that a protection effect can be achieved, and meanwhile, the exhaust pipeline is connected with the gas return pipe, so that the gas returns to the digestion container again to stir a sample.

The invention relates to a plant volatile oil extraction and separation device. The plant volatile oil extraction and separation device comprises a supporting frame, a distillation tank erected on thesupporting frame, a material containing roller arranged in the distillation tank, a driving mechanism used for driving the material containing roller to rotate, a condenser connected with the steam outlet of the distillation tank and a separation device connected with the condenser. A steam communicating pipe is arranged on the distillation tank and used for being connected with a steam generatorand introducing steam into the distillation tank. The device is simple and convenient to operate as a whole, avoids assembling and supporting different glass instruments, is relatively large in capacity, can rotate the material containing roller, ensures that materials are in full contact with steam, and greatly improves the efficiency and yield of traditional Chinese medicine volatile oil extraction in a laboratory.

The invention belongs to the technical field of nuclear power, and particularly relates to heating equipment for preparing a sample. A water sample to be treated is contained in each heating vessel; each heating pot can perform water bath heating on a heating vessel in the heating pot at a preset temperature; a condensing pipe of the condensing equipment is respectively communicated with each heating vessel, the vacuum device and the waste liquid collecting container through pipelines, and the vacuum device can suck to form a negative pressure environment in the condensing pipe in a working state, so that steam generated by heating a water sample to be treated in each heating vessel enters the condensing pipe through the pipeline; and the condensing pipe condenses the entering steam to form condensate which flows into the waste liquid collecting container. A relatively closed loop is formed among the plurality of heating vessels, the condensing pipe, the waste liquid collecting container and the vacuum device, so that steam overflow in the preparation process is greatly reduced, and the humidity of the laboratory environment is effectively reduced.

The present invention discloses a visbreaking thermal residence time estimation method and a reaction apparatus, and belongs to the field of petrochemical industry. The method comprises: adding raw material oil to a viscosity reducing reactor; heating the viscosity reducing reactor so as to make the raw material oil be subjected to visbreaking, wherein the reaction temperature and the industrial visbreaking temperature are the same; collecting light gas oil; after completing the reaction, mixing the viscosity reducing oil in the viscosity reducing reactor and the light gas oil to obtain the viscosity reducing generating oil; and carrying out true boiling point cutting on the viscosity reducing generating oil and industrial viscosity reducing oil, and comparing the kinematic viscosities of the two viscosity reducing residue oils at the same temperature, wherein the reaction time is the thermal residence time of the industrial visbreaking when the relative difference of the kinematic viscosities is within the predetermined value range. The reaction apparatus comprises the viscosity reducing reactor, a heating furnace, a condenser, a receiver and a pressure controller. According to the present invention, with the visbreaking thermal residence time estimation and the laboratory visbreaking optimization results, the basis is provided for the optimization and the improvement on the industrial tower type visbreaking apparatus process conditions and the industrial apparatus, and the science research and production requirements are met.

The invention discloses an energy-saving enthalpy difference laboratory heat exchange system capable of switching modes. The energy-saving enthalpy difference laboratory heat exchange system comprises a first heat exchanger, a second heat exchanger, a first switch assembly, a second switch assembly, a third switch assembly, a fourth switch assembly, a first compressor, a second compressor, a condenser, a pressure adjusting assembly and a fluorine barrel, wherein the first compressor, the condenser and the fluorine barrel are sequentially circulated to form a first circulation; the second compressor, the condenser and the fluorine barrel are sequentially circulated to form a second circulation; the first heat exchanger can be used for accessing and outputting a refrigerant at different positions of the first circulation or the second circulation through the first switch assembly; the second heat exchanger can be used for accessing and outputting the refrigerant at different positions of the first circulation or the second circulation through the second switch assembly; the second compressor can be communicated with an outlet of the fluorine barrel or an outlet of the first heat exchanger through the third switch assembly; the second compressor can be communicated with an inlet of the condenser or an inlet of the fluorine barrel through the fourth switch assembly; the pressure adjusting assembly can be used for adjusting the pressure of the fluorine barrel.

The invention provides an integrated negative pressure square bin air conditioning system and a control method. The integrated negative pressure square bin air conditioning system is characterized in that a fresh air inlet is formed in the side face or the top of a square bin laboratory; a first nylon filter, a first evaporator, a G4 primary filter, a bag type medium efficiency filter, a second evaporator, a first condenser, an electric heater and an air feeder are sequentially arranged on a fresh air channel from the fresh air inlet to the inside, and the air feeder is arranged on an air feeding window; the square bin laboratory is connected with an air return window, and the air return window is inwards sequentially provided with a plurality of layers of disinfecting and filtering parts and an exhaust centrifugal machine; and a second condenser is arranged on the side edge, one side of the second condenser is connected with the environment through a condensation fresh air inlet, and the other side of the second condenser is provided with an axial flow fan. According to the integrated design, indoor air treatment, air conditioner condensation waste heat recycling and an exhaust system are integrated into one unit. The material consumption of an air pipe system is reduced, the free heat recovery design is adopted, the investment of electric heating is reduced, and the purpose of saving energy is achieved.

The invention discloses a temperature and humidity working condition adjusting system, which comprises a compressor, a condenser, a throttling valve, a dehumidifying coil, a sensible heat coil, a hot air bypass loop, a humidifying device, a heating device and a temperature and humidity controller, wherein the dehumidifying coil, the sensible heat coil, the compressor, the condenser and the throttling valve are connected end to end in sequence through a conduit to form a main loop; the hot air bypass loop is connected between an outlet of the compressor and an inlet of the sensible heat coil; and the throttling valve, the hot air bypass loop, the humidifying device and the heating device are connected with the temperature and humidity controller respectively. According to the temperature and humidity working condition adjusting system, the adjustability of four working conditions is realized through dehumidification of the hot air bypass loop, cooling adjustment of the throttling valve and the conventional heating and humidifying treatment, the useless cold and dehumidification capacity of the working condition adjusting unit are reduced to the greatest extent, and the aim of reducing operation energy consumption is fulfilled, so that the annual operation energy consumption of a constant temperature and constant humidity laboratory during use of the system can be saved by over 30 percent.