89results about How to "Prevent liquid hammer" patented technology

The invention provides a heat pump system control method and a heat pump system. The heat pump system comprises a compressor, an outdoor heat exchanger, a four-way reversing valve, a gas-liquid separator, and a heating device for heating the gas-liquid separator. The four-way reversing valve has a first state when the heat pump system is in refrigeration operation and a second state when the heatpump system is in heating operation. The control method comprises the step of after switching on the compressor, and before switching the first state of the four-way reversing value to the second state, controlling the heating device according to a state parameter of a refrigerant in the outdoor heat exchanger. The heating device is used for heating a refrigerant in the gas-liquid separator so asto promote refrigerant gasification, the refrigerant entering the four-way reversing valve from a gas outlet of the compressor is at a gas state, and a liquid-state refrigerant cannot be accumulated in the four-way reversing valve, so that the occurrence of the phenomenon of liquid impact caused when the four-way reversing valve reverses after starting up at a heating mode is avoided, and the four-way reversing valve is prevented from being damaged by liquid impact.

The invention discloses a supercritical-water-oxidation energy recovery system. The supercritical-water-oxidation energy recovery system disclosed by the invention has the beneficial effects that theoutlet end of a supercritical water oxidation reactor is connected with a high-pressure hydrocyclone, inorganic salts in reaction products in the supercritical water oxidation reactor are discharged from a sewage discharging port, high-pressure and high-pressure gas generated is exhausted into a buffering tank to carry out flat-pressing treatment, then the flatly-pressed gas passes through a high-pressure turboexpander and a low-pressure turboexpander in sequence to carry out residual-heat utilization for generating power, an outlet of the low-pressure turboexpander is connected with an evaporator, a Rankine circulation system is connected on the evaporator and is utilized for further utilizing residual heat of fluid passing through the evaporator, so that the energy input of the Rankine circulation system is reduced; the supercritical water oxidation system and a residual-heat and residual-pressure recovery system are fully combined, and heat energy and pressure energy of supercritical water oxidation products are fully utilized, so that the energy recovery and utilization rate of the supercritical water oxidation system is increased; carbon dioxide in the products is separated and recovered by utilizing a gas-liquid separator and a rectifying tower, so that the emission of greenhouse gas is reduced.

The invention provides a control method for uniformly distributing a refrigerant during refrigeration of a modular multi-split air conditioner. The control method comprises the following steps of a) calculating the total capacity requirement N of an indoor unit module for m outdoor unit modules connected in parallel under the refrigeration operation state; b) initially distributing the capacity requirement of each outdoor unit module; c) detecting the bottom temperature Tbi of a compressor of the ith outdoor unit module by using a first temperature sensor; d) detecting the air return temperature Tri of the compressor of the ith outdoor unit module by using a second temperature sensor; e) calculating the air return superheat SHi of the ith outdoor unit module according to a formula that Shi=Tbi-Tri; f) adjusting the capacity requirement Ni of the ith outdoor unit module according to the air return superheat Shi of the ith outdoor unit module, making the air return superheat Shi and the adjusted capacity requirement NI' meet the following function: I=1,2,3,ellipsis,m, wherein NI'=[NI']=min{n belongs to Z and NI' is less than or equal to n}, and repeating steps c, d, e and f every ten minutes. The invention also provides a modular multi-split air conditioner for uniformly distributing a refrigerant during refrigeration. By the control method, the refrigerant in outdoor unit modules is distributed uniformly.

The invention discloses a control method for preventing a multi-unit air conditioner screw compressor from liquid impact. The method comprises the following steps of: (1) closing each electromagnetic valve and closing an electronic expansion valve of each indoor unit when an air conditioning unit is electrified and stands by; (2) when oil temperature of an oil sump reaches a set oil temperature, opening a master liquid supply electromagnetic valve, opening a liquid supply electromagnetic valve on a liquid supply pipe of an indoor unit which receives a power-on instruction, opening the electronic expansion valve of the indoor unit, and loading the screw compressor in a gradient way until the screw compressor is fully loaded; (3) opening an electromagnetic valve on a gas-liquid separator oil return pipe when the total load of the indoor unit is in a partial load condition; (4) closing a liquid supply electromagnetic valve and the electronic expansion valve on the corresponding liquid supply pipe when a certain indoor unit is stopped; and (5) when the indoor unit is stopped, closing the master liquid supply electromagnetic valve, closing the electromagnetic valves and the electronic expansion valves on the liquid supply pipes of all the indoor units, and then stopping the screw compressor. Compared with the conventional method, the method has the characteristic of avoiding liquidimpact phenomenon, along with high operation stability and safety.

The invention relates to a heat collecting device of a water heating system, in particular to a heat collecting board achieving flow channel same-stroke constant pressure distribution. According to the heat collecting board, working media in a flow channel are evenly distributed, and the effective heat collecting area can be enlarged. The heat collecting board comprises a board body and the working medium flow channel formed inside the board body. The working medium flow channel comprises main flow channels and branch flow channels. The board body is provided with a master flow channel inlet and a master flow channel outlet. The master flow channel inlet is connected with the main flow channels through a same-stroke flow divider. The main flow channels are the same in flow stroke. The other end of each main flow channel is connected with the branch flow channels through a same-stroke flow divider. The branch flow channels are the same in flow stroke. Each branch flow channel is provided with a reducing section. The reducing sections are the same in length and diameter. The tail ends of the branch flow channels are gathered and then are connected with the master flow channel outlet. The master flow channel outlet is formed in the upper end of the board body. According to the heat collecting board achieving flow channel same-stroke constant pressure distribution, by means of the same-stroke constant pressure distribution of the working medium flow channel, the working media are evenly distributed in the working medium flow channel, the effective heat collecting area is enlarged, and the heat collecting effect is improved.

The invention discloses a double-circulation refrigerating system of an inverter refrigerator and a control method thereof, and relates to the technical field of refrigerators. The system comprises aninverter compressor, wherein an air outlet of the inverter compressor is sequentially connected with an anti-condensation pipe, a condenser, a filter and a one-inlet and two-outlet electric switchingvalve, and an air inlet of the inverter compressor is connected with a two-inlet and one-outlet electric switching valve; the two-inlet and one-outlet electric switching valve and the one-inlet and two-outlet electric switching valve are connected with a refrigerating branch I and a refrigerating branch II; the refrigerating branch I comprises a first capillary tube, a first evaporator and a first liquid accumulator; and the refrigerating branch II comprises a second capillary tube, a second evaporator and a second liquid accumulator. The liquid accumulators are arranged on the two refrigerating branches arranged in parallel respectively, and the two-inlet and one-outlet electric switching valve and the one-inlet and two-outlet electric switching valve are opened and closed, so that migration of refrigerants in two chambers is controlled, and sufficient utilization of the refrigerants is guaranteed.

The invention discloses a gas-liquid separator and a heat pump unit comprising the same. The gas-liquid separator comprises a casing, a first inlet / outlet pipe and a second inlet / outlet pipe; an inner cavity of the casing comprises a separation cavity; the separation cavity forms a rotating cavity extending vertically along an axis; an oil return port communicating with the separation cavity is formed in the bottom end of the casing; the first inlet / outlet pipe and the second inlet / outlet pipe are connected onto the casing; the first inlet / outlet pipe communicates with the separation cavity in the tangential direction to form a communicating port; the second inlet / outlet pipe extends into the inner cavity from the top end of the casing; and an opening, extending into the inner cavity, of the second inlet / outlet pipe is located below the communicating port. According to the gas-liquid separator, liquid oil drops in an oil-gas mixture are suitable to flow in the first inlet / outlet pipe when separated, so that the purity of a separated gaseous refrigerant can be improved; and a liquid refrigerant contained in a gas-liquid mixture is suitable to flow into the second inlet / outlet pipe when the liquid refrigerant is relatively many, thus, the separation speed can be increased, and the gas-liquid separator further has multiple functions during practical application.

The invention discloses a liquid impact preventing system and method. The liquid impact preventing system comprises a bypass pipeline, an adjustable switch and an electronic expansion valve, wherein the bypass pipeline is connected with an exhaust gas pipeline and a suction gas pipeline of a compressor and is provided with the adjustable switch and the electronic expansion valve; the bypass pipeline is used for extracting exhaust gas of the compressor so that the exhaust gas can sequentially pass through the adjustable switch and the electronic expansion valve to be mixed with suction gas of the compressor, the superheat degree of the suction gas is controlled to meet a preset condition, and liquid impact is prevented; the adjustable switch is used for adjusting the suction volume of the exhaust gas in the bypass pipeline; and the electronic expansion valve is used for carrying out cooling and pressure reducing treatment on the exhaust gas. In this way, the situation that the suction gas of the compressor contains liquid can be avoided, it does not need to arrange a gas-liquid separator, return oil can directly flow into the compressor, and therefore the normal oil returning of thesystem is guaranteed while the liquid impact phenomenon is avoided. The utilization efficiency of lubricating oil is improved, the charge volume of lubricating oil is reduced, and energy sources aresaved.

The invention discloses an air conditioner capable of preventing the liquid impact of a compressor and a control method for preventing the liquid impact of the compressor. The air conditioner capableof preventing the liquid impact of the compressor comprises a refrigerant circulation loop, an outdoor environment temperature sensor and a compressor air return pipe sensor, wherein the refrigerant circulation loop is at least composed of the compressor, a reversing valve, a first heat exchanger, a throttling device, a second heat exchanger and a liquid storage tank which connected in sequence, one end of bypass pipeline is connected to a pipeline between the reversing valve and the first heat exchanger, and the other end of the bypass pipeline is connected to a pipeline between the first heat exchanger and the throttling device; at least one part of the bypass pipeline is coiled on the liquid storage tank or is located at the lower part of the compressor, whether a control valve is opened or not is judged through that the detected actual outdoor environment temperature T is compared with the set outdoor environment temperature T by an air conditioning system, when the detected actualoutdoor environment temperature T is too low to be lower than the set outdoor environment temperature T, the control valve is opened, a part of high-temperature refrigerant discharged from an exhaustport of the compressor enters the bypass pipeline to preheat the compressor, and the phenomenon of liquid impact of the compressor is effectively prevented.

The invention discloses an energy-saving control system of a refrigeration compressor unit. The energy-saving control system comprises a refrigerating unit, a PLC (Programmable Logic Controller), a human-computer interface, a frequency changer and a suction pressure sensor, wherein the refrigerating unit comprises an invariable frequency compressor and a variable frequency compressor, and the frequency changer is used for controlling the rotating speed of the variable frequency compressor, so that suction pressure of the variable frequency compressor is controlled at a numerical value corresponding to the controlled environment temperature; the suction pressure sensor is used for obtaining the suction pressure of a suction opening of the variable frequency compressor in real time and conveying suction pressure data to the PLC, and the PLC is used for adjusting the frequency changer in real time; and the human-computer interface is used for displaying the numerical value and setting a suction pressure starting value.

The invention discloses a heat-pump water heater cold shielding system for protecting a compressor. The heat-pump water heater cold shielding system comprises the compressor, a condenser, a throttling device, an evaporator and a gas-liquid separator which are sequentially connected to form a circulation loop, the throttling device comprises a primary capillary tube and a secondary capillary tube which are parallelly connected, and a real-time flow control device is arranged at a liquid inlet end of the secondary capillary tube. Since the real-time flow control device is arranged at the liquid inlet end of the secondary capillary tube, refrigerant flow passing through the secondary capillary tube is adjusted in real time, appropriate amount of refrigerant flows into the evaporator to be evaporated sufficiently, gaseous refrigerant returned into the compressor is guaranteed not to be mixed with liquid, and influence on service life of the compressor from liquid impact is eliminated to the greatest extent. In addition, since the appropriate amount of the refrigerant participates into evaporation in the evaporator, the gaseous refrigerant returned into the compressor is guaranteed to be sufficient, system efficiency is prevented from being affected by the compressor due to insufficient refrigerant, and even affect on normal work of the compressor is avoided.

The invention relates to the technical field of air conditioners and particularly provides an air-conditioning system. The air-conditioning system aims to solve the problem that the refrigerating or heating effect of an existing air conditioner is not ideal. For this purpose, the air-conditioning system comprises a compressor, an outdoor unit and an indoor unit and further comprises a heat exchanging device. The heat exchanging device is used for enabling a refrigerant flowing out of the indoor unit to be subjected to heat exchanging with a refrigerant flowing out of the outdoor unit. By adopting the air-conditioning system, the refrigerant flowing out of the indoor unit can be subjected to heat exchanging with the refrigerant flowing out of the outdoor unit to increase the vaporization temperature of a low-temperature and low-pressure gaseous refrigerant and decrease the condensing temperature of a high-pressure and high-temperature liquid refrigerant, thus the refrigerating or heating effect of an air conditioner is improved, running away of the refrigerants can further be avoided, the loss of the refrigerating or heating capacity of the air conditioner is avoided, and the use experience of a user is improved accordingly.

The invention discloses a cascade storage temperature refrigerator, which comprises a compressor (21), a condensation evaporator (23), a refrigerating chamber evaporator (34) and an electric control device (36), wherein the condensation evaporator (23) is provided with a low pressure inlet (22C); a bypass pipeline (35) is arranged between a refrigerant pipeline before the inlet of the refrigerating chamber evaporator (34) and the low pressure inlet (22C) of the condensation evaporator (23); and the bypass pipeline (35) is provided with an electromagnetic valve (33) connected with the electric control device (36). When the temperature of a freezing chamber is higher and the temperature of a refrigerating chamber has reached the lower limit, the electromagnetic valve is opened to reduce the refrigerant passing through the refrigerating chamber evaporator, so that the temperature conditions of two chambers of the refrigerator are in the set ranges, and the problems caused by not matched temperatures of the two chambers in the prior art are avoided. The invention also discloses a temperature control method for the cascade storage temperature refrigerator. Corresponding control methods are provided for various temperature conditions of the refrigerating chamber and the freezing chamber, so the temperatures of the two chambers of the refrigerator are better matched.

The invention discloses a refrigerating system. The refrigerating system comprises a compressor, a condenser, a throttling device, an evaporator, a temperature sensing device and an air returning pipe, wherein the compressor is connected with the condenser, the throttling device and the evaporator in sequence; one end of the air returning pipe is connected with an outlet end of the evaporator and the other end of the air returning pipe is connected with an inlet end of the compressor; the temperature sensing device is fixedly mounted on the air returning pipe and an included angle of 45 degrees is formed between the temperature sensing device and the horizontal radial direction of the air returning pipe; a heat preservation sleeve sleeves the temperature sensing device along the axial direction of the air returning pipe; the heat preservation sleeve is wound by a waterproof material. According to the refrigerating system, the influences on the temperature sensing device caused by the fluctuation of refrigerating fluid at the outlet end of the evaporator and the temperature sensing accuracy of a temperature sensing bag caused by the outer environment temperature are greatly reduced; the temperature sensing accuracy is improved and the refrigeration of the refrigerating system is sufficient; the stable operation and the efficient refrigeration of the system are realized. The invention further provides an ice cream maker and the ice cream maker is provided with the refrigerating system.

The invention discloses a vapour liquid separator for a heat pump system. The vapour liquid separator comprises a shell, an inlet pipe, an outlet pipe and an oil return pipe. A containing cavity is defined in shell, and an oil return opening is formed in the shell. The inlet pipe is arranged on the upper portion of the shell. The outlet pipe is arranged at the top of the shell. A first end of the outlet pipe stretches into the containing cavity. The portion, stretching into the containing cavity, of the outlet pipe is a straight pipe. The oil return pipe is connected with the oil return opening and the outlet pipe. At least one part of the oil return pipe forms a capillary tube. According to the vapour liquid separator for the heat pump system, a great amount of liquid refrigerants in the vapour liquid separator are prevented from entering a compressor, meanwhile it is further avoided that the heat pump system generates the liquid impact phenomenon after defrosting is ended, the liquid impact phenomenon with liquid generated after the heat pump system is halted and when the heat pump system is restarted is further avoided, and the safety and stability of the heat pump system with the vapour liquid separator and the compressor connected with the vapour liquid separator are improved.

The invention discloses a recycling machine, and provides a full-automatic four-port recycling machine and a using method thereof. The machine is easy to operate, liquid impact can be avoided during liquid recycling, and a recycling mode and a self-cleaning mode can be automatically switched in the whole process. The technical problems that crash, motor burnout, overload protector burnout and the like are easily caused, time and labor consumption is high during operation, safety accidents are easily caused and the like because liquid impact is easily caused and the whole process is manually operated in the prior art are solved. The machine comprises a shell, and a control valve, a compressor, a condenser and a fan which are arranged in the shell, wherein recycling machine gas and liquid input ports and recycling machine gas and liquid output ports which are connected with a refrigeration system are formed on the control valve; a gas-liquid sensor is arranged at the recycling machine liquid input port; a plurality of electromagnetic valves capable of controlling the on-off of input and output pipelines of the compressor are arranged on the pipelines; and the electromagnetic valves and the gas-liquid sensor are electrically connected to a control circuit and control the on-off of the corresponding pipelines through the control circuit.

The invention discloses a two-stage compression refrigerating system which is a system aiming at reducing losses in the throttling process and improving the system energy efficiency. The exhaust portof a function compressor is connected with the inlet of a condenser, the outlet of the condenser is connected with the inlet end of an expansion machine, the outlet end of the expansion machine is connected with the gas-liquid inlet of a receiver, the liquid outlet of the receiver is connected with the inlet of an evaporator through a restricting element, the outlet of the evaporator is connectedwith the air sucking opening of a booster compressor, the exhaust opening of the booster compressor is connected with the gas inlet of the receiver, the gas outlet of the receiver is connected with the air sucking opening of the function compressor, and the booster compressor is driven by the expansion machine. By means of the system, the expansion machine expands to act to drive the booster compressor to run, the losses of the throttling process are reduced, and the energy efficiency ratio of a refrigerating cycle is improved. Meanwhile, compressor liquid hammering caused by unbalanced liquidsupply amount and evaporation capacity in the evaporator is avoided, and the maintaining cost is reduced. In addition, the structure is simple, installation is convenient, and cost is low.

The invention discloses an air conditioner comprising a refrigerant circulation loop composed of a compressor with a gas-liquid separator, a four-way valve, an outdoor exchanger and an indoor heat exchanger. The air conditioner further comprises a flow control device. An inlet of the flow control device is connected with the four-way valve. An outlet of the flow control device is connected with the gas-liquid separator of the compressor. The invention further discloses an air conditioner control method and device and a computer readable storage medium. The situation that returned refrigerants are all gathered into the gas-liquid separator of the compressor is prevented, overflowing of the refrigerants in the gas-liquid separator to the compressor due to the excessively high liquid level of the refrigerants is avoided, and accordingly the liquid impact phenomenon of the compressor is avoided.

The invention discloses a refrigerant circulation system and refrigeration equipment. The refrigerant circulation system comprises a compressor, a condenser and an evaporator, refrigerants in the compressor pass through the condenser and the evaporator sequentially and then return to the compressor, and an air-returning pipe is connected between the compressor and the evaporator; the refrigerant circulation system further comprises a heating piece which is connected with the air-returning pipe. According to the embodiment, the heating piece is arranged to evaporate liquid-state refrigerants in a capillary pipe and the air-returning pipe, so that the refrigerants sucked into the compressor when the compressor is started are gaseous-state refrigerants; accordingly, the liquid-state refrigerants can be prevented from being sucked into the compressor, the liquid impact phenomenon can be prevented from occurring in the compressor, and the normal operation of the compressor is facilitated, and the service life of the compressor can be prolonged.

The invention provides a vehicle air conditioner fluid storage device, which belongs to the technical field of air conditioners. It solves the problem of inconvenient disassembly of the existing liquid reservoir. The cylinder body of the air conditioner liquid storage device for the vehicle, the cylinder body includes an upper cylinder body and a lower cylinder body; an air intake pipe, which is arranged on the lower surface of the cylinder body, and the air intake pipe includes a connecting part and an installation part; an air outlet pipe, an air outlet pipe It is located in the same vertical plane as the air intake pipe; the sound-absorbing assembly is arranged in the accommodation cavity; the first filter screen is provided with a first annular bracket on the inner side wall of the upper cylinder, and a first annular bracket is opened on the first annular bracket. An annular groove, the first filter screen is clamped in the first annular groove and the first filter screen is located above the sound-absorbing assembly; the second filter screen is provided with a second annular bracket on the inner side wall of the lower cylinder, and the second annular A second annular groove is opened on the bracket, and the second filter net is clamped in the second annular groove. The vehicle air-conditioning liquid storage device has the advantages of convenient disassembly and good noise reduction effect.

The invention provides a low-temperature air energy heat pump unit applying a flash evaporator air supplement circuit to remove frost. The low-temperature air energy heat pump unit is mainly composedof a variable-frequency air supplement compressor, a user side heat exchanger, a air-cooled evaporator, a vapor-liquid separator, a flash evaporator, a four-way valve, an electronic expansion valve, adrying filter, a solenoid valve and all refrigerant pipelines for connecting the components. The problems that under a low temperature environment, the heating capacity of heating and preparing of domestic hot water of an ordinary heat pump is reduced sharply, and under the outdoor low temperature environment with the high relative air humidity, the ordinary heat pump is very prone to frosting, and consequently, the performance of the heat pump unit is affected seriously are mainly solved, and an air energy heat pump operates efficiently and stably for a long time at the low environment temperature.

The invention discloses a defrosting control system comprising a compressor, a four-way valve communicating with the compressor, a condenser, a first one-way valve, a gas-liquid separator, a second one-way valve, a first filter, an electromagnetic valve, a first threaded coupling, a thermal expansion valve, a second filter, an air cooler, a second threaded coupling, a third one-way valve, a third filter, an electronic expansion valve and a fourth filter. The gas-liquid separator communicates with the four-way valve, and the fourth filter communicates with the condenser. The defrosting control system has the effects of enhancing the protection for the compressor and avoiding a liquid impact phenomenon.

The invention relates to a liquid separator, and relates to the technical field of liquid separators. According to the main technical scheme, the liquid separator comprises a barrel body, an air absorbing tube, a filter screen assembly and at least two exhausting tubes, wherein the air absorbing tube is connected to the top end of the barrel body; the filter screen assembly is mounted in the barrel body, comprising a filter screen and a filter screen bracket; a plurality of through holes are formed in the filter screen bracket; each exhausting tube is connected to the bottom end of the barrel body, and each exhausting tube comprises an inner exhausting tube which is arranged in the barrel body and positioned below the filter screen bracket; the direct-facing area between an air inlet of each inner exhausting tube and each through hole in the filter screen bracket is avoided. The liquid separator is mainly used for decreasing the quantity of liquid refrigerants which directly enter the exhausting tubes through the through holes in the filter screen bracket, thus the impact vibration of the liquid refrigerants on the exhausting tubes and a compressor can be reduced, the liquid impact can be prevented, and as a result, the running reliability of the compressor can be improved.

The invention discloses an air conditioning system. The air conditioning system comprises a first refrigerant circulation loop and a second refrigerant circulating loop, wherein the first refrigerantcirculation loop comprises an outdoor heat exchanger, a gas-liquid separator, a first compressor and an indoor heat exchanger which are arranged in series, the second refrigerant circulating loop comprises a first heat exchanger, a throttling device, a second heat exchanger and a second compressor which are sequentially connected in series, and the second heat exchanger is arranged at the periphery and / or the bottom of the gas-liquid separator. The invention further provides a control method of the air conditioning system. rapid heating starting can be achieved through the air conditioning system in a low-temperature environment.

The invention relates to a frostless refrigerated storage of a ternary evaporator for preservation of agricultural products, which comprises a compressive condensing refrigerating unit (1) outside the storage and an air cooler (2) inside the storage, a wall evaporation exhaust tube (3) on the storage wall, a terrace shallow pool (7), an evaporation exhaust tube (4) in the terrace shallow pool (7), and the like. A refrigerating medium is placed in the terrace shallow pool (7); and the compressive condensing refrigerating unit (1), the air cooler (2), the wall evaporation exhaust tube (3), the evaporation exhaust tube (4) and the compressive condensing refrigerating unit (1) are communicated in turn to form a refrigeration and heat exchange cycle. The wall evaporation exhaust tube (3) can arranged on any one wall or multiple walls except the wall provided with the air cooler (2). The frostless refrigerated storage can also be provided with a spray device consisting of a spray pipe (5), a pump (6), and the like. The frostless refrigerated storage has the characteristics of reducing frosting of the air cooler, reducing defrosting operation, and reducing energy consumption, keeping high humidity and comparatively constant temperature of the refrigerated storage, and improving preservation effect of the agricultural products greatly.

The invention discloses an automatic refrigeration storage for fruit and vegetable fresh keeping. A civil assembly combined type storage body is adopted, and no cold bridge building envelope is provided. According to a refrigeration device, a refrigeration unit is arranged outside the refrigeration storage, and a multi-element evaporation device and the refrigeration unit are connected in the storage. According to the automatic refrigeration storage, air temperature in the storage and temperature of an evaporator are monitored respectively and controlled in a combined mode, and external heating is not needed for melting and removing a frost layer on the surface timely molten. Compared with an existing cold air circulation refrigeration storage, operation of the refrigeration unit and a cold air fan is monitored in real time through temperature detection, the degree of automation is high, manual routing inspection is not needed, door opening and closing frequency is reduced, over 30% of energy and 90% of manpower are saved compared with a conventional refrigeration storage, and over 9% of energy is saved compared with external heating frost melting.

The invention discloses an air conditioner and an air conditioner condensation-prevention method, and relates to the technical field of air conditioners. The air conditioner comprises a backheating branch and a controller; the controller is electrically connected with a frequency conversion compressor and an electronic expansion valve, and is used for adjusting the opening degree of the electronicexpansion valve and the frequency of the frequency conversion compressor according to the air suction overheat degree of the frequency conversion compressor and the evaporation temperature of an evaporator, and therefore the evaporation temperature is larger than the environment dew point temperature. One end of the backheating branch is connected with a pipeline enabling a condenser to be connected with a liquid storage tank, the other end of the backheating branch is connected with the liquid storage tank, the backheating branch is provided with a backheating pipe segment and a control valve, the control valve is electrically connected with a controller, the backheating pipe segment is wound on the pipeline between the evaporator and the frequency conversion compressor, and is used forcarrying out heat exchange on a refrigerant before entering the frequency conversion compressor from the evaporator. The liquid hammer phenomenon is avoided while in the work process the evaporator ofthe air conditioner does not generate condensate water.

The invention relates to a multi-pressure-stage air supply type high-temperature heat pump steam system, and belongs to the field of application expansion of high-temperature heat pump systems. The heat pump steam system is composed of assemblies such as a heat source inlet, a heat source throttle valve, an evaporator, a heat source outlet, an air supply compressor, a main body compressor, a condenser, a heat return control valve group, a first heat regenerator, a subcooler, a primary expansion valve, a primary flash evaporator, and a secondary flash evaporator. Through multi-stage pressure regulation and control in the system, the heating effect and the steam production efficiency of the system are effectively improved, and a high-temperature heat pump circulation module partially adoptsfour-stage pressure comprising low pressure, medium pressure, high pressure and air supply pressure, so that the working state of a circulation refrigerant is effectively controlled, the power consumption of a compressor inside the system is reduced, the heating effect of the system is improved, the steam production efficiency is improved, and the structural optimization of the high-temperature heat pump system and the further development of the field of heat pump steam production are facilitated.