39results about How to "Prevent freezing and cracking" patented technology

The invention relates to an automatic control type efficient self sucking pump. The automatic control type efficient self sucking pump comprises a pump body, a motor, an automatic exhausting and vacuumizing device and an intelligent control box; a liquid inlet is formed in the bottom of the pump body and is connected to an inlet elbow, a liquid outlet is formed in the side surface of the pump body and is connected to an automatic blowoff valve, an outlet stand pipe is arranged on the top of a valve body of the automatic blowoff valve, and the bottom of the valve body of the automatic blowoff valve is connected to a return pipeline through a return valve; a rotation shaft of the motor is connected to a pump shaft through a coupling, a pump cover is arranged between the pump body and the motor, a cavity formed by the pump body and the pump cover is a pump cavity, and an impeller is arranged inside the pump cavity; the pump cover is provided with an inductive probe and a vacuumizing and exhausting hole, an exhausting pipeline is installed on the vacuumizing and exhausting hole, the automatic exhausting and vacuumizing device communicates with the pump cavity through the exhausting pipeline, and the motor, the inductive probe and the automatic exhausting and vacuumizing device are electrically connected to the intelligent control box through signal cables. The automatic control type efficient self sucking pump is simple and compact in structure, the self sucking function is realized by the automatic exhausting and vacuumizing device, and the hydraulic efficiency is high.

The invention relates to a method for manufacturing a paper water pipe. The paper water pipe comprises the following raw materials in percentage by weight: 85 to 90 percent of wood pulp paper, 8 to 10 percent of paper tube adhesive, 0.08 to 1 percent of film (PE), 1 to 1.2 percent of aluminum plating film (VMPEP) and 0.05 to 0.08 percent of film (OPE). The method comprises the following steps of: 1, slitting paper strips for later use; 2, arranging the paper strips in order; 3, sizing; 4, thermally sealing a device; and 5, rolling paper tubes. The paper water pipe has the advantages of environmental protection, corrosion resistance, rust resistance, cracking resistance in winter, long service life, light weight, convenient construction, thermal seal connection at a joint, low cost and the like.

The invention belongs to the field of electronics and control technology, specifically relates to a control method for saving energy in water circulating pump in winter. Its specific steps are that preinstall turning frequency, turning delay, the minimum and maximum limit of different temperatures pulse frequency. According to the range of temperature between outlet pipe and return pipe the energy-saving control cabinet adopts the PID algorithm to adjust pump operation frequency, when the pump operating frequency is lower than the turning frequency and the break over delay, and then pump operation frequency will be adjusted to the temperature maximum pulse frequency, and maintain a maximum delay time; pump operation frequency is higher than turning frequency and then adjusting by PID regulator; If the pump operating frequency below the turning frequency after adjustment, returning to the steps at the beginning of re-operation; if operation frequency higher than the break over frequency, entered the PID regulator. The invention adopts pulse working to prevent the water pump electricity motor works in the lower frequency limit for long hours, which cause the pipeline freezing and frost cracking because the end of pipeline can't bear under lower temperature long time and couldn't achieve consumer need. To the PWM technology application, the heating temperature is able to adjust heating temperature real-time in accordance with outdoor free air temperature.

The invention relates to a dual-purpose energy-saving efficient test bed for a heat source tower and a cold and hot water heat pump unit. The dual-purpose energy-saving efficient test bed comprises acold and heat supply system, a unit test system and an intermediate pipeline valve system. The cold and heat supply system comprises a working condition machine, a hot water tank, a cold water tank and a cooling tower. The unit test system comprises an air conditioning cabinet, a cold-side heat exchanger, a hot-side heat exchanger, an expansion water tank, an electric valve, a flowmeter and a water pump. The middle pipeline valve system comprises a butterfly valve and a water pump. The experiment table can realize performance test and scientific research of a heat source tower heat pump all-in-one machine and a cold and hot water heat pump unit product under different high and low temperature working conditions and cold and heat conditions. The experiment table effectively utilizes the cold source of the tested machine, reduces the energy consumption of the working condition machine, and achieves the energy-saving effect. The experiment table is optimally provided with an optimal working condition machine, and the effects of multiple working conditions and low cost are achieved. The experiment table fills the blank of the prior art in the technical field.

The invention relates to an anti-freezing method, an anti-freezing control system and a gas water heater. The anti-freezing method comprises the following steps: obtaining a first detection temperature value on a pipeline of a heat exchanger, and obtaining a second detection temperature value of an environment in which the gas water heater is located; determining whether to enter an anti-freezingworking mode or keeping a standby working mode according to the first detection temperature value; and if it is determined to enter the anti-freezing working mode, determining to enter a first anti-freezing working mode, a second anti-freezing working mode or a third anti-freezing working mode according to the second detection temperature value. According to the anti-freezing method, a proper anti-freezing working mode is determined according to the second detection temperature value of the environment in which the gas water heater is located, anti-freezing gradation is distinct, pipeline icing frost cracks of the gas water heater can be effectively prevented, anti-freezing efficiency is relatively high, and energy waste can be avoided.

The invention discloses an anti-freezing intelligent water meter. The anti-freezing intelligent water meter comprises a sealing pad, a first cavity, a casing, a second protecting device, a first protecting device and a water inlet pipe. By means of arrangement of the sealing pad, the sealing effect of a meter cover on the casing top and an observation window is improved, the anti-freezing and heat-insulation effects on the casing top and the observation window in frost weather are improved, and equipment practicability is improved; the anti-freezing and heat-insulation effects of inside of thecasing are realized by filling the first cavity with sponge and other heat-insulation materials, the condition of freezing of parts in the casing in frost weather is further avoided, normal use of equipment in the frost weather is guaranteed, and anti-freezing and heat-insulation performance of the equipment is improved; nesting of a water outlet pipe is realized by the second protecting device and the first protecting device, so that the protective heat-insulation effect on the water outlet pipe in the frost weather is realized, the condition of freezing in the water outlet pipe is further avoided, and the equipment practicability is improved.

The invention relates to a cold and hot water heat pump and a heat source tower heat pump low-cost test bed operating in a wide working condition. The low-cost test bed comprises a cold and heat supply system, a unit test system and an intermediate pipeline valve system. The cold and heat supply system comprises a working condition machine, a hot water tank, a cold water tank and a cooling tower.The unit test system comprises an air conditioning cabinet, a cold-side heat exchanger, a hot-side heat exchanger, an expansion water tank, an electric valve, a flowmeter and a water pump. The middlepipeline valve system comprises a butterfly valve and a water pump. The experiment table can realize performance test and scientific research of a heat source tower heat pump all-in-one machine and acold and hot water heat pump unit product under different high and low temperature working conditions and cold and heat conditions. The experiment table effectively utilizes the cold source of the tested machine, reduces the energy consumption of the working condition machine, and achieves the energy-saving effect. The experiment table is optimally provided with an optimal working condition machine, and the effects of multiple working conditions and low cost are achieved. The experiment table fills the blank of the prior art in the technical field.

The invention discloses an integrated type anti-freeze and pressure relief valve. The integrated type anti-freeze and pressure relief valve comprises a valve body 1. The valve body 1 is internally provided with a water channel 2 allowing water to flow through. An anti-freeze assembly which can block the water channel 2 is arranged on the valve body 1, and when the environment temperature is lower than the set temperature, the anti-freeze assembly automatically opens the water channel 2 to conduct water draining. Before the temperature of a water route system of a water heater reaches the critical crystallization temperature, the water route system is made in a flow state through the integrated type anti-freeze and pressure relief valve; and after a water route absorbs enough heat energy carried by flowing water and friction heat produced by relative flow, the water route system can be above a critical crystallization temperature point all the time, and freezing and frost cracking of the water route system can be prevented. The valve body 1 is further provided with a pressure relief device which can block the water channel 2, when the water pressure of the water route is higher than the set value, the pressure relief device automatically opens the water channel 2 to conduct water draining and pressure reduction, and thus, the anti-freeze and pressure relief functions are achieved at the same time; and the integrated type anti-freeze and pressure relief valve is simple in structure, safe, reliable and convenient for households to install and use.

The invention belongs to the technical field of PVC pipes, and particularly relates to an environment-friendly PVC pipe. The environment-friendly PVC pipe comprises a pipe body, clamping films are arranged on the two sides of the pipe body at intervals in the vertical direction, two flow guide grooves are formed in the inner wall of the pipe body, the height of the middles of the flow guide grooves is larger than that of the two ends, and two flow guide pipes are arranged in the single flow guide groove. Through the clamping films and the flow guide pipes, during freezing, the clamping films become convex, freezing and cracking caused by expanding of the pipe body can be prevented, meanwhile, the clamping films which become convex can be matched with a fixing clamping ring which is mountedon the wall and used for fixing the pipe body, the clamping films are clamped on the fixing clamping ring, all weight of the frozen pipe body is dispersed on the fixed clamping ring through the clamping films, the dangerousness of the tensile failure of the pipe body is reduced, meanwhile, during defrosting, through the flow guide pipes, defrosted water flows back to ice blocks on the clamping films, melting of the ice blocks on the clamping films can be quickened, and the influence that during defrosting, due to the fact that the clamping films become convex, ice columns cannot fall off is avoided.

The invention provides a strong-effect anti-cracking cable sheath and a preparing method thereof, and relates to the technical field of cable production. The cable sheath is prepared from, by weight,55-65 parts of polyethylene, 25-35 parts of epoxy resin, 12-16 parts of carbon fibers, 8-12 parts of quartz fibers, 4-8 parts of polypropylene fibers, 12-16 parts of titanium dioxide, 8-12 parts of polytetrafluoroethylene, 4-8 parts of polyimide, 2-4 parts of an anti-shrinking agent, 1-2 parts of an anti-ageing agent, 2-4 parts of an accelerating agent, 1-2 parts of a dispersing agent and 1-2 parts of a defoaming agent. According to the strong-effect anti-cracking cable sheath and the preparing method thereof, the shortcomings of the prior art are overcome, the low-temperature resistance and anti-cracking performance of the cable sheath are effectively improved, all the components in the cable sheath are jointed mutually, thus the generation and development of cracks of the cable sheath are effectively prevented, then the situation that the cable sheath is frozen and cracks, and electric leakage and other accidents are caused accordingly is prevented, and the strong-effect anti-cracking cable sheath is high in safety, excellent in performance and suitable for popularization.

The invention discloses a solar water heater device integrating the functions of automatic water loading and automatic water pipe emptying. The solar water heater device comprises a heat-insulating water tank, a temperature-regulating valve and an intelligent control instrument and a tap water pipe, wherein the heat-insulating water tank is communicated with the tap water pipe through a water service pipe; an upper emptying valve and a lower emptying valve are mounted on the water service pipe and are electrically connected with the intelligent control instrument respectively; two limber holes communicated with emptying ports are opened so as to discharge water in an upper water service chamber and a lower water service chamber through the emptying ports of the emptying valves below the upper water service chamber and the lower water service chamber, so that the frost splitting of water pipes are prevented, which guarantees the normal use of solar energy in freezing winter.

The invention provides a face rockfill dam seepage prevention structure. The face rockfill dam seepage prevention structure comprises a bed rock and a toe plate located on the bed rock. A seepage prevention layer flush with the toe plate is mounted on the downstream side of the toe plate, a rockfill material, a transition layer, a cushion material, a geomembrane and a face plate are sequentially mounted upwards from the seepage prevention layer, a construction face is mounted on the side face, facing the downstream part, of the toe plate, and the face plate, the geomembrane, the cushion material, the transition material, the rockfill material and the seepage prevention layer are in contact with the construction face. Compared with the related technology, the face rockfill dam seepage prevention structure combines advantages of a concrete face rockfill dam and a geomembrane face rockfill dam, the face plate, the geomembrane, a water stop copper sheet, the toe plate, the seepage prevention layer, a seepage prevention curtain and the bed rock form a whole seepage prevention system, whole stress performance is improved, and the dam water stop effect is ensured.

A PVC insulating cable disclosed in the invention comprises a cable body and a pulling mechanism, wherein the surface of the cable body is provided with an anti-slip stripe, and the outer part of thecable body is provided with a pulling mechanism, the inner part of the cable body is provided with a power wire core conductor near a center position, the power wire core conductor is arranged aroundthe cable body, and the outer part of the power wire core conductor is wrapped with a first water stop layer. A pull mechanism is provided, the invention is convenient for the worker to pull the position of the cable body by using a pulling mechanism, heat preservation layer is provided, the phenomenon of freezing and cracking on the cable body is avoided, a shield hollow layer, a shielding particle fil layer, a hollow straight column and a shielding liquid adsorbing cotton layer are arrange, that signal interference ability of the cable body is increased, a heat shrinkable outer protective layer is arranged, the cable body can be protected, a flame retardant layer is arranged, and the phenomenon that combustion occurs due to high heat of the power wire core conductor inside the cable bodycan be avoided.

The invention relates to the technical field of gas water heaters, and discloses an anti-freezing method of a gas water heater, and the anti-freezing gas water heater. The anti-freezing method comprises the steps: the temperature of a heat exchanger in an anti-freezing mode and the environment temperature of the gas water heater are obtained; whether the temperature of the heat exchanger is lowerthan a preset first anti-freezing threshold value or not is judged; when the temperature of the heat exchanger is lower than the preset first anti-freezing threshold value, a fan is started; whether the environment temperature is larger than a preset air warming anti-freezing threshold value or nor is judged; if yes, the gas water heater enters into an air warming anti-freezing mode; and if not, acombustion device is started, and the gas water heater enters into a combustion anti-freezing mode, wherein the air warming anti-freezing threshold value is larger than the first anti-freezing threshold value. The anti-freezing method of the gas water heater, and the anti-freezing gas water heater have the beneficial effects that by adopting the fan and combustion combined anti-freezing method, icing of pipelines in the water heater can be effectively prevented, an electric heating anti-freezing device does not need to be additionally arranged, energy can be saved, and the anti-freezing costis lowered.

The invention provides a pipeline component, a heat exchanger component and an air conditioner. The pipeline component comprises a pipeline connector and sleeve pipes, wherein the pipeline connector comprises an inner pipe and an outer pipe which sleeves the inner pipe; the sleeve pipes sleeve the periphery of the pipeline connector; at least one end of the inner pipe sequentially extends out of the outer pipe and the corresponding sleeve pipe; on end of each sleeve pipe is connected with the outer pipe; a clearance is formed between each sleeve pipe and the inner pipe; and the sleeve pipes and / or the inner pipe are separately provided with a damage-prevention structure which is used for preventing the inner pipe from being damaged. By adopting the technical scheme of the invention, the problem in the prior art that the inner pipe is easily cracked due to deformation can be solved.

The invention relates to a control method for preventing failure caused by water flow loss during defrosting of a heat pump unit. The heat pump unit comprises a shell, a compressor, a four-way valve, a water side heat exchanger, an air side heat exchanger, a water outlet temperature sensor, a low-pressure pressure sensor and a refrigerant pipeline, wherein the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger are arranged in the shell, and the refrigerant pipeline communicates with the compressor, the four-way valve, the water side heat exchanger and the air side heat exchanger. The water outlet temperature sensor is arranged at the water drainage end of the water side heat exchanger. The low-pressure pressure sensor is arranged at the air return end of the compressor. The method comprises the following steps that after a defrosting mode is started, the outlet water temperature is obtained through the outlet water temperature sensor, and the low-pressure value is obtained through the low-pressure sensor; and if the outlet water temperature is larger than or equal to the preset temperature threshold value, and within the set first time range, the outlet water temperature is not in the decreasing trend, and the low-pressure value is in the decreasing trend, the defrosting mode is quitted. According to the method, the running reliability of the unit is enhanced, and the safety of the unit during defrosting is improved.

The invention discloses an innovative backwashing filter and an application thereof. The innovative backwashing filter comprises a filter body, a filter screen assembly and a filter element assembly;the filter body is provided with a main water inlet, a first water outlet, a backwashing water outlet and a filter element assembling opening; the filter screen assembly is provided with a filter screen raw water side and a filter screen purified water port, the filter screen raw water side is communicated with the main water inlet, and a rotary drainage blade is arranged at a correspondingly communicated transition position of the filter screen raw water side and the main water inlet; the backwashing water outlet corresponds to the filter screen raw water side; and the filter element assemblyis installed on the filter element assembly opening, the filter screen purified water port is communicated with the raw water side of the filter element assembly through the filter body, and the water purification side of the filter element assembly is communicated with the first water outlet. The innovative backwashing filter ingeniously avoids the backwashing requirement of the filter element assembly, realizes simple, convenient and automatic cleaning of the filter screen assembly, and the filter element part has the advantages of simplicity, material saving and low cost.

The invention relates to a gas disturbance type low-temperature water chiller which comprises a water tank, a plate-shaped evaporator and an air pump, wherein the plate-shaped evaporator is soaked in the water of the water tank, a refrigerant channel is arranged in the plate-shaped evaporator, a water outlet pipe is arranged at the upper part of the plate-shaped evaporator, a water inlet pipe is arranged at the lower part of the plate-shaped evaporator, the water inlet pipe is provided with a water distribution hole, a gas header is installed below the water inlet pipe, a small hole is formed on the gas header, and the gas header is connected with the air pump through windpipes. The gas disturbance type low-temperature water chiller provided by the invention has the advantages that the air pump performs ventilation on the bottom of the water tank, the outer surface of the plate-shaped evaporator is not frozen by virtue of the air disturbance, and the problem of closed evaporator freeze spalling can be avoided; and the heat exchange efficiency of the plate-shaped evaporator is improved, and the low-temperature cold water at the temperature lower than 2 DEG C, and the demands on low-temperature cold water in other industries can be met.

The water pipe structure capable of preventing frost crack features that onto the inner wall, one anticorrosive lining of foamed rubber and / or foamed plastic in the thickness not smaller than 0.06 times the water pipe inner diameter is attached. The lining has smooth surface to avoid water infiltration and seal inner air bubbles. The non-metal foamed material possesses certain compression performance, and in the condition of water freezing, it provides the expansion space for the ice to expand in further temperature lowering so as to avoid frost crack of the water pipe.

The invention provides an air inlet stop valve module, an automatic anti-freezing gas water heater and a control method of the automatic anti-freezing gas water heater, and relates to the technical field of water heaters. The valve body comprises a fluid flow channel, the fluid flow channel is provided with a first port and a second port, and the valve body is provided with a side connector; the stop block is provided with an air flow channel and is slidably connected to the side connector. The check block is in transmission connection with the driving piece, and the driving piece is used for driving the check block to slide inwards or outwards so that the check block can block or open the fluid flow channel; the fluid flow channel and the air flow channel are not communicated at the same time. The automatic anti-freezing gas water heater comprises a gas inlet stop valve module. Through the air inlet stop valve module, the situation that in the prior art, an automatic drainage anti-freezing water heater system cannot ensure that residual water in the heat exchanger is completely drained is relieved, and the technical effects that the residual water in the heat exchanger can be completely drained, and the heat exchanger is prevented from frost cracking are achieved.

The invention discloses a control method of a urea pump and an engine aftertreatment system, and relates to the technical field of catalytic reduction of engine exhaust gas. The control method of the urea dosing pump includes the following steps: after the vehicle is powered off, obtain the minimum ambient temperature in the environment where the vehicle is located within a preset time in the future; determine whether the minimum ambient temperature is greater than or equal to a threshold, and if so, stop the vehicle. In the control method of the urea dosing pump provided by the present invention, when the obtained minimum ambient temperature is greater than or equal to the threshold value, it indicates that there is no risk of freezing in the connecting pipeline, and the urea dosing pump is controlled to skip sucking back and stop directly. The control method of the urea pump can not only keep the connecting pipeline moist and reduce the risk of urea crystallization, but also shorten the time interval from the power off to the shutdown of the vehicle, and optimize the user experience.

The invention discloses a full-automatic energy-saving anti-freezing device which is composed of a heat preservation box body, a control electric appliance and a conversion mechanism; the heat preservation box body is composed of an inner storage box, an outer heat preservation box body and a heat preservation material; the control electric appliance is composed of a bidirectional motor, a suctionswitch assembly, a power combination switch, a liquid level sensor assembly, a temperature sensor W, a thermometer T, a liquid level meter H, a positive rotating coil M1, a reverse rotating coil M2,a variable resistance coil B, a fuse wire R and a suction-pull coil S; the conversion mechanism is composed of a bidirectional pump wheel, a pulling pile-shaped valve, an air inlet valve assembly andan exhaust valve assembly. The device has the advantages of being light and convenient to operate, not only solving the problem of difficulty in winter construction, but also being safe and reliable,being free of pollution, high in working efficiency, low in labor intensity, light and simple in structure, low in manufacturing cost, and easy to install, and the heat in the liquid can be effectively stored and reused, the conventional starting time is shortened, the preheating fuel is saved, and the service life of the machine is prolonged.

The invention relates to a combustion heat exchange assembly and a gas water heater. The combustion heat exchange assembly comprises a combustor body and a pot. The pot is arranged on the combustor body, so that a flame of the combustor body can directly act on the bottom wall of the pot. The pot is provided with a water outlet located at the position in contact with the bottom wall of the pot. The bottom wall of the pot is provided with multiple concave portions which are recessed from the outside face to the inside face, so that the heat exchange area of the bottom wall of the pot is increased, and the heat exchange efficiency is improved. Multiple concave portions are arranged in a spaced manner. A flow guiding passageway is formed between the concave portions on the inner side face ofthe bottom wall and communicates with the water outlet, so that water in the pot can be completely discharged from the water outlet, and the situation that when the temperature is lowered and freezinghappens, the pot is frozen to be cracked is avoided. The situation that since the concave portions are arranged to increase the heat exchange area of the bottom wall of the pot, interruption of the water flow is formed, and the water cannot be completely discharged is avoided; and in this way, the combustion heat exchange assembly can improve the heat exchange efficiency and also can achieve theanti-freezing purpose.

The invention provides a winter anti-freezing and emergency system and method used for workshop fire hoses. The system is installed in each water supply houses. The system includes a manual bypass system and an electric bypass system. The electric bypass system includes a first manual stop valve (15), a water inlet electric valve (11), a pipeline valve (12), a water outlet electric valve (13) and a first check valve (14). The manual bypass system includes a second manual globe valve (16), a second check valve (17) and a third manual check valve (18). The first manual check valve (15) is connected with a new water main pipeline and is then connected with water inlet electric valve (11), the pipeline pump (12), the water outlet electric valve (13) and the first check valve (14) successively. The second bypass check valve (16) is connected with the main water inlet pipe and is then connected with a second check valve (17) and a third manual globe valve (18) successively. The third manual globe valve (18) is connected with the main water inlet pipe of a fire hydrant.

The invention discloses a control method of a urea pump and an engine aftertreatment system, and relates to the technical field of engine exhaust catalytic reduction. The control method of the urea pump comprises the following steps that after a vehicle is powered off, the lowest environment temperature of the environment where the vehicle is located in the future preset time is obtained; and whether the lowest environment temperature is larger than or equal to a threshold value or not is judged, and if yes, the vehicle is stopped. According to the control method of the urea pump, when the obtained lowest environment temperature is larger than or equal to the threshold value, a connecting pipeline has no freezing risk, the urea pump is controlled to skip suck-back, and the vehicle is directly stopped. According to the control method of the urea pump, the interior of the connecting pipeline can be kept wet, and the urea crystallization risk is reduced; and the time interval from powering-off to stopping of the vehicle can be shortened, and the user experience is optimized.

The invention discloses a water meter capable of avoiding freezing cracking. The water meter is characterized in that the water meter shell comprises an inward bent part, and the inward bent part extends outwards when being frozen and extruded. According to the method and the system, the technical problem of how to prevent freezing and cracking through the change of the water meter shell is solved.