195results about How to "Prevent liquid shock" patented technology

The invention discloses a control method of an electronic expansion valve, a radiation air conditioner and a storage medium. After a startup instruction is received, operation mode information in thestartup instruction is obtained; when the operation mode is refrigeration or dehumidification, the openness of the electronic expansion valve is set as preset initial openness; finally, after the radiation air conditioner is operated by a first preset time length according to the preset initial openness, a superheat degree of an evaporator is calculated, and the openness of the electronic expansion valve is adjusted according to the superheat degree, so that liquid impact and damage of the compressor caused by halfway evaporation of a refrigerant in the evaporator are prevented, frequent stopof the compressor caused by higher superheat degree of the evaporator is prevented, the control precision of the superheat degree of the radiation air conditioner is improved, and the operation stability and the life of the compressor are guaranteed.

The invention provides an air-conditioning heat pump system for electric cars. The air-conditioning heat pump system comprises a compressor (1), a four-way valve (2), an outdoor air-cooled heat exchanger (3) with an outdoor fan (4), a one-way valve set, a throttle flow path with a main throttle element (9), and an indoor air-cooled heat exchanger (10) with an indoor fan (11). Therefore, the air-conditioning heat pump system is provided with a refrigerating mode and a first heating mode respectively. The compressor (1) comprises an air supplement inlet (1'). The air-conditioning heat pump system further comprises an air supplement flow path with an air supplement device. One end of the air supplement flow path, in front of the main throttle element, is connected to the throttle flow path, and the other end of the air supplement flow path is connected to the air supplement inlet, so that air hotter and more pressurized than low-temperature low-pressure air is selectively supplied to the compressor so as to achieve a second heating mode.

The invention discloses a method for controlling superheat degree of air-conditioning equipment, which comprises the following steps: detecting compressor suction pressure P1, compressor suction temperature T1, compressor bottom temperature Td and outdoor environment temperature Th; calculating Tb, DeltaTx and DeltaTd; judging whether Th is smaller than or equal to 0 DEG C, and if so, setting the target suction superheat degree DeltaTm as a first target value, wherein the first target value is -1 DEG C to 1 DEG C; and judging whether DeltaTd is smaller than 10 DEG C, if so, giving an alarm, and if not, adjusting the opening of the electronic expansion valve according the magnitudes of DeltaTx and DeltaTm. The practice proves that the suction superheat degree of the invention is 0-1 DEG C when the outdoor environment temperature is smaller than or equal to 0 DEG C, thereby avoiding the phenomenon of carbon deposition due to overhigh exhaust temperature; only when the compressor bottom superheat degree is greater than or equal to 10 DEG C, the invention adjusts the opening of the electronic expansion valve, thereby still preventing the compressor from liquid slugging in practice when the suction superheat degree is 0-1 DEG C. The invention also discloses a system for controlling superheat degree of air-conditioning equipment.

The invention provides a control method of a heat pump system. The control method comprises steps as follows: the liquid pipe temperature at an outlet of a condenser, the discharge pressure of a compressor, the high-pressure saturation temperature corresponding to the discharge pressure and the discharge temperature of the compressor are acquired; the actual super-cooling degree is calculated according to the high-pressure saturation temperature and the liquid pipe temperature at the outlet of the condenser; the actual discharge superheat degree is calculated according to the discharge temperature and the high-pressure saturation temperature; the target super-cooling degree is acquired according to the actual discharge superheat degree of the compressor; whether the actual super-cooling degree is larger than the target super-cooling degree or not is judged, and if the actual super-cooling degree is larger than the target super-cooling degree, the actual super-cooling degree is reduced by adjusting the opening degree of a throttling device; and if the actual super-cooling degree is not larger than the target super-cooling degree, the actual super-cooling degree is increased by adjusting the opening degree of the throttling device. The invention further provides the heat pump system. With the control method of the heat pump system and the heat pump system, the accuracy of gas filling liquid detection and judgment of the system is improved, and the compressor is prevented from producing liquid impact, so that long-time reliable running of the compressor can be guaranteed.

A refrigerating-heating air conditioning system with a heat regenerator comprises an outdoor heat exchanger and an indoor heat exchanger. The heat regenerator is connected between the outdoor heat exchanger and the indoor heat exchanger. During heating, flowing direction of refrigerants is changed through a four-way reversing valve, the indoor heat exchanger is used as a condenser, and the outdoor unit is used as an evaporator. Refrigerant gas is sucked into a compressor and then pressurized to be changed into high-temperature high-pressure refrigerant gas, the high-temperature high-pressure refrigerant gas is condensed and emits heat in the indoor heat exchanger to be changed into intermediate-temperate high-pressure liquid, indoor air passes the surface of the indoor heat exchanger to be heated so as to increase the indoor temperature, the intermediate-temperate high-pressure liquid is subjected to throttling and depressurization of an expansion valve to be changed into low-temperate low-pressure liquid, the low-temperate low-pressure liquid is changed into low-temperate low-pressure gas in the outdoor heat exchanger, outdoor air passes the surface of the outdoor heat exchanger to be cooled, the low-temperate low-pressure gas is sucked into the compressor, and circulation in the way is carried out. Efficiency of the compressor can be improved, liquid impact is prevented, and optimal refrigerant charge of a system is decreased.

The invention discloses a multi-connected air-conditioner unit outdoor unit module and a method for heating and defrosting at the same time through the multi-connected air-conditioner unit outdoor unit module. The module comprises a compressor (1), a four-way reversing valve (2), two outdoor heat exchangers, two outdoor unit electronic expansion valves and five solenoid valves. The compressor (1) is communicated with the four-way reserving valve (2), the first solenoid valve (7) and the second solenoid valve (8). The four-way reserving valve (2) is communicated with the third solenoid valve (9) and the fourth solenoid valve (10). The first solenoid valve (7) and the third solenoid valve (9) are communicated with a first outdoor heat exchanger (3). The second solenoid valve (8) and the fourth solenoid valve (10) are connected with a second outdoor heat exchanger (5). A connection pipe (13) with the fifth solenoid valve (11) is arranged between the two outdoor heat exchangers. The method is characterized in that one outdoor heat exchanger conducts conventional heating circulation while the other outdoor heat exchanger conducts defrosting circulation. By means of the multi-connected air-conditioner unit outdoor unit module and the method, a room can be heated continuously while defrosting is conducted.

The invention discloses a heat pump air conditioning system and a control method thereof. The heat pump air conditioning system comprises a compressor, a four-way valve, an evaporator, a condenser, a first throttling device, a second throttle device, a heat recovery device and a heat exchange device; heat exchange is performed on a refrigerant which is located in a first channel and a refrigerant which is located in a second channel in the heat recovery device; heat exchange is performed on a refrigerant which is located in a third channel and a refrigerant which is located in a fourth channel in the heat exchange device. According to the heat pump air conditioning system, a gaseous refrigerant which is supplied by the heat exchange device is added into the compressor when the heat pump air conditioning system is located in the low temperature state and accordingly the heating capacity is ensured when the heat pump air conditioning system is located in the low temperature state, the displacement of the exhaust opening of the compressor is ensured, the exhaust temperature is reduced, and meanwhile the damage to the compressor due to liquid impact of the refrigerants is prevented.

The invention discloses a low refrigerant charging amount heat pump device and a control method thereof. The device comprises a compressor, a compressor refrigerant gas outlet is sequentially connected with an indoor heat exchanger, a throttling device and an outdoor heat exchanger through a four-way reversing valve, an outlet of the outdoor heat exchanger is connected with an inlet of a liquid storage device through the four-way reversing valve, an outlet of the liquid storage device is connected with an inlet of the compressor, and the device further comprises a bypass pipeline; an inlet of the bypass pipeline is located between the compressor and the four-way reversing valve, an outlet of the bypass pipeline is located between the four-way reversing valve and the liquid storage device or located on the side or bottom of a shell of the liquid storage device, and a bypass electromagnetic valve is located on the bypass pipeline; under the heating condition, when the device stably runs, a refrigerant exhausted out of the compressor flows into the indoor heat exchanger through the four-way reversing valve and then flows back to the compressor through the throttling device, the outdoor heat exchanger, the four-way reversing valve and the liquid storage device, and a heating cycle is formed; and under the refrigerating condition, stable running is opposite to the heating cycle flow path. The control method of the device is further provided. In the cold starting process, the problem that a large number of refrigerants are gathered in the liquid storage device and the compressor, and consequently the pressure of an air inlet of the compressor is too low is solved.

The invention discloses a heat pump air-conditioning system for an electric or hybrid vehicle. The heat pump air-conditioning system for the electric or hybrid vehicle comprises a compressor with the air supplying and enthalpy increasing function, a four-way valve, an external heat exchanger, a bidirectional thermal expansion valve, a middle heat exchanger, an expansion valve, a block valve, an internal heat exchanger, an air return pipeline, an air supplying pipeline, an air blower and an air distributing system. According to the heat pump air-conditioning system for the electric or hybrid vehicle, the flowing direction of refrigeration circulation is made to be opposite to the flowing direction of heating circulation by means of the four-way valve and the bidirectional thermal expansion valve, in this way, both the refrigeration mode and the heating mode are achieved on the electric or hybrid vehicle, PTC heating and electric heating tube heating are not needed for heating, the energy efficiency ratio is high, and the performance is reliable.

The invention provides a method for judging defrosting of a heat pump and a heat pump defrosting system. The method comprises the steps of obtaining a set of heating parameters every a preset time; obtaining the actual heating capacity Q of the heat pump according to the heating parameters; obtaining the heating attenuation rate of the heat pump according to the actual heating capacity Q and the standard heating capacity Q; when the heating attenuation rate is larger than or equal to a heating attenuation rate threshold value, entering a defrosting program. According to the method, by means ofthe heating attenuation rate obtained by conducting calculation according to the environment temperature, the inflow temperature, the outflow temperature and the outflow capacity, the time for the system to enter the defrosting program is more precise, and the defrosting effect and efficiency are improved. The heating attenuation rate threshold value is a fixed numerical value, thus the method issimpler and more convenient and easier to control in actual operation, and the improvement of the defrosting efficiency is facilitated; the defrosting stopping step is determined according to the temperature of a coiler of a fin-type heat exchanger of the heat pump, in this way, actual operation and control are facilitated, and the method is simple and easy to implement.

The invention discloses an injection oil return control method and device for an air-conditioning system and the air-conditioning system. The injection oil return control method comprises the steps that when it is detected that an injection oil return electromagnetic valve is closed, the oil return operating time of a compressor is kept from zero, and the exhaust superheat degree of an exhaust pipe is calculated continuously; if first preset conditions are met, the injection oil return electromagnetic valve is controlled to be opened, and the first preset conditions include that the compressor is at least started for a preset time, the accumulated oil return operating time of the compressor exceeds a second preset time, and the exhaust superheat degree of the exhaust pipe at least reaches a first preset numerical value after operation lasts for a third preset time; and when it is detected that the compressor is stopped or the injection oil return electromagnetic valve is kept open for a fourth preset time, the injection oil return electromagnetic valve is controlled to be closed. By the adoption of the technical scheme, refrigeration oil can be recovered into the compressor in time, the situation that too much refrigerant liquid is brought into the compressor, and consequentially liquid impact of the compressor is caused can also be avoided, and thus the reliability and safety of injection oil return can be improved.

The invention provides a control method for low temperature start-up of an air conditioner of an air-source heat pump system, and the air conditioner, and relates to the technical field of air conditioners. The control method comprises the steps that in response to a start-up heating instruction of the air conditioner, whether the detected ambient temperature is lower than or equal to a preset ambient temperature threshold or nor is judged, and the detected continuous shutdown time of a compressor is greater than or equal to the preset shutdown time is judged; and if the ambient temperature islower than or equal to the preset ambient temperature threshold, and the continuous shutdown time is greater than or equal to the preset shutdown time, so that a four-way valve of the air-source heatpump system is controlled to be switched to be in a refrigeration operation state after the compressor is started up. If the air conditioner meets the preset conditions, the four-way valve is controlled to be switched to be in a heating operation state to enable the air conditioner to conduct normal heating operation. According to the control method for low temperature start-up of the air conditioner of the air-source heat pump system, liquid impact of the compressor can be effectively avoided, thus the start-up reliability of the compressor and the system operation reliability are improved,and the service life of the compressor is prolonged.

The invention discloses a gas-liquid separator. The gas-liquid separator comprises a casing, an air outlet pipe and an oil return assembly. The oil return assembly comprises an oil return valve. The inlet end of the oil return valve communicates with the interior of the casing. The outlet end of the oil return valve communicates with the air outlet pipe. By the adoption of the gas-liquid separator, oil liquid at the bottom of the gas-liquid separator can be pumped into the air outlet pipe and then returns back to a compressor, and the amount of returned oil can be controlled by controlling the action of the oil return valve in the oil return assembly, so that the amount of the returned oil can be adjusted. On the one hand, effective oil return can be achieved in a system, and on the other hand, compressor liquid impact caused by excessive liquid refrigerant absorption in the oil return process can be avoided, so that the reliability of the system can be improved. The invention further discloses the air conditioner system and a control method of the air conditioner system.

The invention discloses a liquid impact preventing air conditioner defrosting system. The liquid impact preventing air conditioner defrosting system comprises a compressor (1), a four-way reversing valve (2), an indoor unit heat exchanger (3), a throttling device (4) and an outdoor unit heat exchanger (5). Four ports of the four-way reversing valve (2) are connected with an outlet of the compressor (1), one end of the indoor unit heat exchanger (3), one end of the outdoor unit heat exchanger (5) and an inlet of the compressor (1) respectively. The two ends of the throttling device (4) are connected with the other end of the indoor unit heat exchanger (3) and the other end of the outdoor unit heat exchanger (5). A liquid storage tank (6) capable of separating gas-liquid two-phase refrigerating fluid is arranged between the four-way reversing valve (2) and the inlet of the compressor (1) and is capable of preventing liquid impact. A heating coil (9) and an electric heater (7) are arranged in the liquid storage tank (6), high-temperature and high-pressure refrigerating fluid gas can be provided for the outdoor unit heat exchanger (5) for defrosting, and it can be guaranteed that the indoor unit heat exchanger (3) can continuously provide heat for a room in the defrosting process.

The invention relates to a tank heat exchanger for a heat pump system. The tank heat exchanger for the heat pump system comprises an outer cylinder, a gas-liquid separator, a heat exchange pipe and a baffle plate, wherein an upper cover plate and a lower cover plate are respectively arranged at the top and the bottom of the outer cylinder; a refrigerant inlet is formed in the bottom of the outer cylinder; a refrigerant outlet is formed in the upper cover plate; the gas-liquid separator includes an inner cylinder; an upper sealing plate and a lower sealing plate are respectively arranged at the top and the bottom of the inner cylinder; the upper sealing plate is provided with an intake pipe and an exhaust pipe; the heat exchange pipe is arranged between the outer cylinder and the inner cylinder, and is spirally coiled out of the inner cylinder; a water outlet and a water inlet are respectively formed in the upper end and the lower end of the heat exchange pipe; and the baffle plate is arranged below the upper cover plate and above the heat exchange pipe. The tank heat exchanger has the advantages of high heat exchange efficiency, low cost, convenience to maintain and clean and excellent freeze preventing function.

The invention discloses an air conditioner and a control method for preventing a compressor from running with liquid. The control method comprises the steps of calculating the air suction superheat degree X and an exhaust superheat degree T of the compressor; carrying out frequency increase operation on the compressor when the air suction superheat degree X of the compressor is smaller than zero,and the exhaust superheat degree T of the compressor is smaller than an exhaust superheat target value T1; and carrying out decrease operation on the opening degree of an electronic expansion valve when the air suction superheat degree X of the compressor is smaller than zero of the exhaust superheat degree T1 of the compressor is smaller than the superheat degree target value T1. According to theair conditioner and the control method for preventing the compressor from running with liquid, the liquid amount of the compressor is controlled by combined action of compressor frequency and the electronic expansion valve, so that the possibility liquid impact of the compressor is reduced, the frequency of compressor damage caused by oil lack is reduced, and the reliability of the compressor andthe whole air conditioner is improved.

The invention provides an air conditioner system comprising an indoor heat exchange device, an outdoor heat exchange device, a four-way valve, a first throttle device, a liquid reservoir and a second throttle device, wherein the indoor heat exchange device and the outdoor heat exchange device are respectively provided with a first and a second refrigerant ports, and the first refrigerant port of the indoor heat exchange device is communicated with the first refrigerant port of the outdoor heat exchange device by a first refrigerant pipe; the first port of the four-way valve is connected with the second refrigerant port of the indoor heat exchange device, the second port is connected with the second refrigerant port of the outdoor heat exchange device, the third port is connected with the exhaust port of a compressor, and the fourth port is connected with the air suction port of the compressor by a second refrigerant pipe; and the first throttle device, the liquid reservoir and the second throttle device are orderly connected to the first refrigerant pipe in series, the second refrigerant pipe is provided with a first pipe section held in the liquid reservoir, and the first pipe section is immersed in refrigerant coming from the first refrigerant pipe in the liquid reservoir, so refrigerant in the second refrigerant pipe exchanges heat with refrigerant in the liquid reservoir. The air conditioner system can simultaneously increase the degree of supercooling and the degree of superheating of cold media in one circulation.

The invention discloses a siphon type gas-liquid separator used for a heat pump, comprising a barrel made of a seamless steal tube, a closing end disposed at the upper portion thereor, a gas return bushing disposed in the internal portion of the barrel center, a vertical gaseous refrigerant gas return tube connected at the upper portion of the gas return bushing, a gas feeding bushing welded in the tangential direction of the barrel, a gas feeding tube connected with the gas feeding bushing, a base welded at the bottom of the barrel, and a low level oil return tube and a high level oil return tube both welded on the internal wall of the gas return bushing. The terminals of both the low level oil return tube and the high level oil return tube extend outside the lower opening of the internal wall. The inventive gas-liquid separator can not only prevent compressor liquid hammer, but also let the lubricant oil carried by the refrigerant enter the compressor to depress gas discharge temperature of the compressor, increase service life of the compressor, and enhance reliability of the system and ability for refrigeration and heating.

The invention relates to the technical field of air conditioners, in particular to a multi-split air conditioning system and a starting control method thereof. The multi-split air conditioning systemand the starting control method thereof aim to solve the problems that in the prior art, when an air conditioning system is started, the air conditioning effect is affected and even the system has ultralow pressure and other faults if the opening degrees of expansion valves of an indoor unit and an outdoor unit are too small, but compressor liquid impact cannot be effectively avoided if the opening degrees are too large. The starting control method of the multi-split air conditioning system includes the following steps of obtaining operation parameters of a compressor in a timed mode in the starting process of the multi-split air conditioning system, obtaining an operation mode of the multi-split air conditioning system, calculating target opening degree values of expansion valves according to the operation mode and the operation parameters, and adjusting the opening degrees of the expansion valves on the outdoor unit side or the indoor unit side according to the operation mode and thetarget opening degree values of the expansion valves. Compared with a method that expansion valves are kept in a fixed opening degree in the starting process in the prior art, the operation effect ofthe multi-split air conditioning system is guaranteed to the maximum extent under the condition of effectively preventing liquid impact, and stable and reliable operation of the system is guaranteed.

The invention discloses an air suction silencer and a compressor, which are used in the compressor field. The air suction silencer comprises a casing, wherein an air inlet and an air outlet are arranged on the casing, the air inlet is arranged on the side wall of the casing to avoid the top end of the casing, and oil leakage holes of the casing are arranged at the bottom of the casing. A guide pipe is connected between the air inlet and the air outlet, and the bottom pipe wall of the guide pipe is provided with an oil leakage hole of the guide pipe. The compressor, including the suction silencer described above. By arranging the guide pipe, the bottom pipe wall of the guide pipe is provided with the oil leakage holes of the guide pipe, and the bottom of the casing is provided with the oilleakage hole of the casing. When liquid lubricating oil enters the air inlet of the silencer, the silencer can separate the sucked lubricating oil and discharge the lubricating oil outside the silencer, thereby ensuring that liquid impact can be effectively avoided, and reducing or avoiding the adverse influence of the liquid impact on the compressor. At the same time, the air inlet avoids the topend of the casing, so that the temperature of the refrigerant sucked through the air inlet is lower, and the cooling capacity and the efficiency of the compressor are improved.

The invention discloses a fault detecting method of a bypass valve of a multi-connected air conditioner system. The fault detecting method comprises the following steps that after the multi-connected air conditioner system receives a detection instruction of the bypass valve, the multi-connected air conditioner system is controlled to enter a test running refrigerating mode; a compressor is controlled to run at preset frequency, and only the bypass valve is controlled to be in a starting state; and the temperature value of an air return opening of the compressor and / or the pressure value of the air return opening of the compressor are / is obtained, and whether a fault happens to the bypass valve or not is judged according to the temperature value and / or the pressure value. According to the method, whether the bypass valve between an exhaust opening and the air return opening of the compressor works normally or not can be effectively and conveniently detected, and therefore the situation that the air return overheating degree of the air return opening of the compressor is too small, consequently, liquid impacts of the compressor are caused, and high-pressure protection happens to outdoor units due to too high exhaust temperature of the compressor can be effectively avoided, and then safe and reliable running of the multi-connected air conditioner system is guaranteed. The invention further discloses the multi-connected air conditioner system.

The invention relates to an anti-liquid impact device for a compressor, in particular to a self-closing and anti-liquid impact device for an air-cooled heat pump air conditioner. The self-closing and anti-liquid impact device comprises a gas-liquid separator, a cross rod, a rope, a floating ball, a vertical rod, a valve core, a hinge, an output pipe, an input pipe, a compressor exhaust pipe and a compressor, wherein the compressor is in closed-loop connection with a condenser, a throttling valve, an evaporator and the gas-liquid separator sequentially; the hinge is fixedly arranged at the bottom of the inner side wall of the gas-liquid separator; and one end of the cross rod is connected to the hinge, and the other end of the cross rod is connected with the floating ball by the rope. The anti-liquid impact device has the advantages that when liquid in the gas-liquid separator is too much, the input pipe is closed to prevent a liquid refrigerant from being absorbed into the compressor so as not to cause liquid impact; the size of the gas-liquid separator is reduced, manufacturing materials are saved, and the space is saved; and the anti-liquid impact device is easy to install and easy to produce and operate.

The invention discloses an electric car air conditioner system which comprises a compressor, a car interior main heat exchanger, a throttling device and a car exterior heat exchanger, and further comprises a flash vessel and a regenerator, wherein the compressor, the car interior main heat exchanger, the throttling device and the car exterior heat exchanger are sequentially connected; the flash vessel is arranged on a connection pipeline between the car exterior heat exchanger and the car interior main heat exchanger and selectively communicates with a compressor air supply opening through an air supply pipeline; and the regenerator is arranged between the compressor and the car interior main heat exchanger and used for conducting heat exchange on coolants entering an air suction opening of the compressor and coolants at an outlet of the car interior main heat exchanger. Enhanced vapor injection is conducted on the compressor through the flash vessel, the regenerator is arranged between the air suction opening of the compressor and the car interior main heat exchanger, the degree of supercooling at an outlet of a condenser and the degree of air suction superheating of the compressor can be effectively improved under the working condition of low temperature heating, and accordingly the heating capacity of the system is improved, liquid impact of the compressor is prevented, and the system reliability is improved. In addition, the invention provides an electric car with the electric car air conditioner system. The driving mileage can be effectively prolonged.

The invention discloses a liquid impact prevention control method and a control device of an air conditioning system and the air conditioning system. The air conditioning system comprises a compressor, a condenser and an evaporator. The method comprises the following steps: the exhaust port temperature of the compressor is detected, and the middle temperature of the condenser and the middle temperature of the evaporator are detected; when the air conditioning system performs the refrigerating operation, the exhaust superheat degree of the compressor is calculated according to the exhaust port temperature and the middle temperature of the condenser; when the air conditioning system performs the heating operation, the exhaust superheat degree of the compressor is calculated according to the exhaust port temperature and the middle temperature of the evaporator; the exhaust superheat degree is monitored in the operation process of the air conditioning system; if the exhaust superheat degree is lower than a first preset value and lasts by first preset time, a timer is controlled to time; and when the time of the timer reaches second preset time, an outdoor unit of the air conditioning system is controlled to stop to prevent liquid impact on the compressor, so that a refrigerant returned to the compressor can be guaranteed in a pure gas state, the liquid impact is prevented, and the detecting precision is improved.

The invention relates to a marine air conditioner liquid supplying control system. The marine air conditioner liquid supplying control system comprises a compressor alternating current contactor and a liquid supplying solenoid valve which are connected to a control power source in parallel. A power-off delay time relay switch is connected to a parallel branch of the compressor alternating current contactor in series. An air conditioner temperature controller is connected to a parallel branch of the liquid supplying solenoid valve in series. A power-on delay time relay and a power-off delay time relay are connected to the liquid supplying solenoid valve in parallel. A compressor alternating current contactor switch is connected to the parallel branch of the liquid supplying solenoid valve in series. A power-on delay time relay switch is connected to a parallel branch of the power-off delay time relay in series. The marine air conditioner liquid supplying control system is simple in structure and reasonable in control, the liquid impact and low-pressure parking problems caused by frequent starting of a compressor can be effectively solved, the using performance of the compressor can be ensured, and the service life of the compressor can be prolonged.

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 a liquid shock preventing control method and device for an air conditioner system and the air conditioner system. The method includes the following steps that the exhaust superheat degree of a compressor is obtained in real time, and the exhaust superheat degree is monitored in the running process of the air conditioner system; if the exhaust superheat degree is smaller than the first preset value and lasts for the first preset time, a timer is controlled to begin to conduct timing; and when the timing time of the timer reaches the second preset time, an outdoor unit of the air conditioner system is controlled to be stopped so as to prevent the liquid shocks from happening to the compressor. Thus, by means of the liquid shock preventing control method of the embodiment, it can be ensured that a refrigerant returning to and sucked by a compressor air returning opening is in a pure gas state by monitoring the exhaust superheat degree in the air conditioner system in real time, and therefore the liquid-state refrigerant is prevented from entering the compressor, and liquid shocks are avoided. In addition, the exhaust superheat value of the embodiment is large, data detection and control are facilitated, the liquid shock preventing control precision is improved, and safety and reliability of running of the air conditioner system are improved.

The invention provides a gas-liquid separator, and belongs to the technical field of air conditioner. The structure of the gas-liquid separator comprises a closed drum body, an air inlet pipe and a U-shaped air outlet pipe. The air inlet end of the air inlet pipe is arranged outside the drum body. The air outlet end of the air inlet pipe is inserted into the drum body. The U-shaped air outlet pipe is arranged on the drum body, and the air outlet end of the U-shaped air outlet pipe is stretched out of the drum body. Two oil return holes which are adjacent and are arranged side by side are formed in one side face of the U-shaped bottom of the U-shaped air outlet pipe. Oil returning is conducted simultaneously, the stable oil return can be achieved, the oil return quantity can be controlled, and backflow quantity of liquid refrigerant is reduced under the regulation of refrigerant oil attenuating, so that the lubricity of the refrigerant oil is guaranteed, the oil return quantity inside the compressor is guaranteed, therefore wear to the running components in the compressor can be reduced, and liquid slugging of the compressor can be prevented effectively at the same time. According to the gas-liquid separator, the principle that the oil return property of the compressor is improved by changing the hole diameter of an oil return hole in the prior art, and an oil return property of the compressor is improved by arranging the two adjacent and abreast oil return holes.

The invention relates to a liquid impact preventing device of a compressor, in particular to a supercooling liquid impact preventing device of an air cooling heat pump air conditioner, comprising a liquid outlet pipe of a condenser, the condenser, an exhaust pipe of a compressor, a liquid outlet pipe of a liquid pump, the liquid pump, an input pipe of a liquid pump, the compressor, a gas suction pipe of the compressor, a gas-liquid separator, a gas inlet pipe of the gas-liquid separator, a controller, a first liquid level sensor and a second liquid level sensor, wherein the liquid outlet pipe of the condenser, the condenser, the exhaust pipe of the compressor, the compressor, the gas suction pipe of the compressor, the gas-liquid separator and the gas inlet pipe of the gas-liquid separator are connected in sequence. The invention has the advantages that liquid is pumped to the condenser when the liquid in the gas-liquid separator is overmuch so that a refrigerant at the bottom of the condenser is supercooled, and the condition that the liquid refrigerant is absorbed in the compressor to cause liquid impact is prevented; the size of the gas-liquid separator is reduced, and the manufacturing material and the space are saved; and the supercooling liquid impact preventing device of the air cooling heat pump air conditioner is simple in installation and easy for production operation.