45results about How to "Avoid aspiration of fluid" patented technology

The invention discloses a frost-less air-source heat pump hot water unit and a proportional-integral-differential control method for the same. The proportional-integral-differential control method includes performing computation according to received air temperature and humidity parameters, received air pressure parameters and received surface temperature parameters of an evaporator when outdoor temperature parameters which are transmitted by a temperature and humidity sensor and are received by a computation controller are lower than 0 DEG C, controlling the opening of an electronic expansion valve according to a computation result and regulating the surface temperature of the evaporator by means of increasing or reducing the opening of the electronic expansion valve so that the surface temperature of the evaporator is constantly higher than a frost formation point; and enabling a silicon-controlled power regulator to judge a suction superheat degree of a compressor according to received suction temperature and suction pressure of the compressor, increasing or reducing the power of an electric heater and maintaining that the suction superheat degree of the compressor only varies within a set value range. The frost-less air-source heat pump hot water unit and the proportional-integral-differential control method have the advantage that adjustment for the opening of the electronic expansion valve is matched with adjustment for the power of the electronic heater, so that the purpose of maintaining safe and efficient running of a system is achieved.

The invention discloses a frostless air handling unit and a proportion-integration-differential control method of the frostless air handling unit. The frostless air handling unit comprises a circulating working return circuit and a controllable silicon power adjuster, wherein the circulating working return circuit is composed of a compressor assembly, a condenser, an electronic expansion valve and an evaporator assembly, the compressor assembly, the condenser, the electronic expansion valve and the evaporator assembly are sequentially connected along the refrigerating fluid flowing direction. When a calculation controller receives an outdoor temperature parameter transmitted by a temperature-humidity sensor and the temperature parameter is lower than 0 DEG C, the calculation controller carries out calculation according to received air temperature and humidity parameters, an air pressure parameter and an evaporator surface temperature parameter, controls the opening degree of the electronic expansion valve according to the calculation results, and adjusts evaporator surface temperature through increase or reduction of the opening degree of the electronic expansion valve. Meanwhile, the controllable silicon power adjuster judges an air suction superheat degree of a compressor through received compressor air suction temperature and air suction pressure, adjusts increase or reduction of electric heater power, and maintains the air suction superheat degree of the compressor to be kept in a preset value range. According to the frostless air handling unit and the proportion-integration- differential control method of the frostless air handling unit, the aim of maintaining safe and high-efficiency operation of the system is achieved.

The invention provides an electronic expansion valve control method and a refrigerant circulation system. The control method comprises the steps of acquiring a current actual degree of superheat delta' and a current actual degree of supercooling epsilon' of the refrigerant circulation system; obtaining a first comparing result by comparing the actual degree of superheat delta' with a preset degree of superheat threshold value delta or a preset degree of superheat range [delta 1, delta 2], wherein the delta 1 is a first degree of superheat threshold value, and the delta 2 is a second degree ofsuperheat threshold value; obtaining a second comparing result by comparing the actual degree of supercooling epsilon' and a preset degree of supercooling threshold value epsilon or a preset degree of supercooling range [epsilon 1, epsilon 2], wherein the epsilon 1 is a first degree of supercooling threshold value, and the epsilon 2 is a second degree of supercooling threshold value; and adjusting the opening degree of an electronic expansion valve by comprehensively comparing the first comparing result and the second comparing result. According to the control method of the electronic expansion valve, heat exchange capacity and energy efficiency of the system can be improved while gas suction with liquid is avoided, the structure of system is not changed, and the production cost of the system is not increased.

The invention provides a control method and device for air-replenishing enthalpy increasing. The method comprises the following steps that the current air-replenishing pressure and temperature of an air-replenishing loop are obtained; and according to the current air-replenishing pressure and temperature, the current superheat degree of the air-replenishing loop is determined. Through the method, according to the difference value of the current superheat degree and a preset superheat degree of the air-replenishing loop, the opening of an electronic control valve is adjusted, the purpose that air suction has an enough superheat degree can be ensured, liquid is prevented from being carried in air suction, and performance of a compressor is improved; and the air-replenishing quantity can be quickly adjusted, it is ensured that a unit can efficiently operate under different working condition loads, and energy saving performance of the unit is greatly improved.

The invention provides a control method of an electronic expansion valve and a heat pump system. The control method comprises the following step: when the current actual air suction superheat degree x of the heat pump system is within a preset range, adjusting the opening degree of the electronic expansion valve according to the current actual supercooling degree gamma of the heat pump system and the current load of a compressor. In the control method provided by the invention, the opening degree of the electronic expansion valve is adjusted according to the actual supercooling degree and the current load when the actual air suction overheat degree is within the preset range, so that the supercooling degree of the heat pump system can be matched with the actual load of the compressor. Accordingly, the heat exchange capacity and the energy efficiency of the heat pump system can be improved when the entrainment of a liquid in air suction is avoided, the own structure of the heat pump system cannot be changed, and the production cost of the heat pump system cannot be increased.

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 provides a finned evaporator and a liquid distribution control method and device thereof. The finned evaporator comprises a plurality of liquid distribution branches, and a refrigerant flow adjusting valve and a temperature sensor are arranged on each liquid distribution branch; and a temperature sensor is arranged on a connecting pipeline of the finned evaporator and a compressor. The technical problem that liquid distribution of an existing finned evaporation heat exchanger is uneven is solved, the heat exchange performance loss of the heat exchanger due to uneven liquid distribution is avoided, and air suction with liquid of the compressor can be avoided under the rated load or the low load.

The invention discloses an improved self-cascading refrigeration cycle system and a control method thereof, which are applied to low-temperature systems such as low-temperature freezers, low-temperature refrigerators, medical low-temperature refrigeration instruments, etc. Compared with the traditional self-cascade system, the regenerator and throttle device are added between the condenser and thegas-liquid separator. The system can not only make the two fluids exchange heat more fully in the evaporative condenser, but also prevent the compressor from sucking in the liquid, raise the evaporative pressure of the whole system, reduce the pressure ratio of the compressor, and improve the efficiency of the compressor, so as to increase the refrigeration capacity of the system and improve theperformance of the circulating system. As such, that present invention has significant advantage over conventional self-cascade cycle using regenerator and throttle valves in front of the gas-liquid separator.

The invention relates to a rectangular dry type shell-and-tube heat exchanger. The rectangular dry type shell-and-tube heat exchanger comprises a tube pass and a broken-line-shaped shell pass, whereinthe tube pass is composed of a channel and U-shaped heat exchange tubes, and the broken-line-shaped shell pass is composed of a shell, a tube sheet and spoilers; a tube pass inlet and a tube pass outlet are formed in the channel; and a shell pass inlet and a shell pass outlet are formed in the shell. The rectangular dry type shell-and-tube heat exchanger is characterized in that the shell is a rectangular shell; one end of the shell is closed; the tube sheet is arranged at the other end surface of the shell; the multiple U-shaped heat exchange tubes are arranged in the shell in a rectangularmode; the end parts of the U-shaped heat exchange tubes are supported by the tube sheet; the channel is arranged on the outer side of the tube sheet and is used for performing shunting on the U-shapedheat exchange tubes; and a rectangular sealing gasket is arranged between the channel and the tube sheet.

The invention provides a heat pump system and a control method thereof. The heat pump system comprises a compressor (1), a first heat exchanger (3), a first gas supplementing pipeline and a first heatregenerator (6); the first end of the first gas supplementing pipeline is connected to a gas supplementing port of the compressor (1); a pipeline between the first heat exchanger (3) and the compressor (1) is a first heat exchanging pipeline; and heat exchanging is performed between the first heat exchanging pipeline and the first gas supplementing pipeline through the first heat regenerator (6).The heat pump system can effectively raise the gas sucking temperature of the compressor, it is avoided that liquid is taken during gas sucking of the compressor, the gas sucking superheat degree isimproved, and the unit heating capacity is increased.

The invention provides a scroll compressor and a heat pump system. The scroll compressor comprises a casing (1), a fixed scroll plate (2) and an air suction pipe (3); the air suction pipe (3) is arranged on the casing (1); the fixed scroll plate (2) is provided with an exhaust port (4); the scroll compressor further comprises an air suction reheating assembly; the air suction reheating assembly isin heat exchange contact with the air suction pipe (3); an air inlet of the air suction reheating assembly communicates with the exhaust port (4); an air outlet of the air suction reheating assemblycommunicates with an exhaust cavity (5) of the casing (1); and at least part of a refrigerant discharged from the exhaust port (4) flows through the air suction reheating assembly and flows to the exhaust cavity (5) after being subjected to heat exchange with a refrigerant flowing through the air suction pipe (3). According to the scroll compressor, the phenomenon that liquid is carried due to airsuction can be effectively avoided, and the operation reliability of the scroll compressor is improved.

The invention relates to the technical field of air conditioners, in particular to a liquid distributor, an evaporator and an air conditioning system. The liquid distributor aims at solving the problem that an existing liquid distributor is not uniform in liquid distribution. In order to achieve the purpose, the liquid distributor comprises an upper cover and an upper shell, a first liquid distribution cavity is defined between the upper cover and the upper surface of the upper shell, a plurality of first liquid distribution holes are formed in the position, located in the first liquid distribution cavity, of the upper shell, and a liquid inlet is formed in the upper cover; the upper cover is arranged in the length direction of the upper shell, the projection of the upper cover on the upper shell is in a trapezoid shape, and the liquid inlet is formed in the side, close to the lower bottom of the trapezoid, of the upper cover. The projection of the upper cover on the upper shell is arranged to be trapezoid, and the liquid inlet is formed in the side, close to the lower bottom of the trapezoid, of the upper cover, so that when a refrigerant flows, the kinetic energy of the refrigerant can be basically kept unchanged, and a better liquid homogenizing effect is achieved.

The invention provides a vertical falling film heat exchanger, comprising: a cylinder vertically arranged and provided with openings at both ends, an air inlet at the upper part of one side for insertion of an intake pipe, and a liquid outlet at the lower part of the other side; an exhaust distribution plate disposed on the inner wall of one side of the cylinder and provided with distribution holes in both sides; upper and lower tube plates respectively disposed on the upper and lower opening ends of the cylinder; a plurality of heat exchange pipes disposed at the inner part of the cylinder, and two ends of which are respectively inserted into the upper and lower tube plates; at least one liquid collecting plate provided with liquid collecting holes in the surface, sleeving the heat exchange pipe and provided with a notch on the outer edge; a water inlet chamber, of which an open end cover is arranged on the upper tube plate, the side wall is provided with a water inlet for insertion of a water inlet pipe, and the closed end is provided with an exhaust port for insertion of an exhaust pipe; a drainage chamber, of which an open end cover is arranged on the lower tube plate and the closed end is provided with a drainage port for insertion of a drainage pipe. The falling film heat exchanger improves the heat exchange performance on both sides of the shell side and pipe side, greatly improves the heat exchange performance, reduces the cost, is simple in structure, avoids aspirating liquid, and improves system reliability.

The invention relates to a parallel sharing system vortex hydraulic filling type direct cooling unit special for the surface treatment industry. The parallel sharing system vortex hydraulic filling type direct cooling unit comprises a shell and tube type condenser, a hydraulic filling type corrosion prevention evaporator, a first pipeline system and a second pipeline system, wherein the first pipeline system and the second pipeline system are connected between the shell and tube type condenser and the hydraulic filling type corrosion prevention evaporator. The first pipeline system and the second pipeline system form a closed loop. The first pipeline system comprises two vortex compressor units which are connected in parallel, and each vortex compressor unit comprises multiple refrigeration compressors which are connected in parallel through pipelines, and an oil separator. The refrigeration compressors are connected with the hydraulic filling type corrosion prevention evaporator, the oil separators are connected with the shell and tube type condenser, and oil return pipelines are further connected between the oil separators and the refrigeration compressors. The second pipeline system comprises a drying filter and control valve sets which are connected in parallel and correspondingly control the different vortex compressor units. The parallel sharing system vortex hydraulic filling type direct cooling unit is reasonable and compact in structure, vortex compressors are connected in parallel to form a large-cooling capacity compressor module, and the function of small unit energy adjustment is achieved.

The invention provides a heat exchanger and an air conditioning unit. The heat exchanger comprises a shell, liquid homogenizing structures and an air return pipe, the air return pipe is arranged in the shell, one end of the air return pipe is communicated with an exhaust port, the other end of the air return pipe is communicated with the interior of the shell, and the periphery of the air return pipe is sleeved with the liquid homogenizing structures. According to the heat exchanger and the air conditioning unit, the multiple liquid homogenizing structures and multiple heat exchange mechanisms are arranged, coil pipe structures are adopted, the length of heat exchange pipes is effectively increased, and therefore the falling film evaporation effect is improved, and the gravity potential difference is greatly increased through the vertical shell. Meanwhile, air return channels are arranged in the middles of the heat exchange mechanisms, so that the heat exchanger is compact in structure, liquid blocking pipes can effectively prevent liquid drops from flowing, the problem of air suction with liquid of the heat exchanger is further avoided, and the falling film heat exchange effect of the heat exchanger is effectively improved.

The invention provides a compressor, an air conditioner and a control method of the compressor. The compressor comprises a compressor body, the compressor body comprises a compressor shell, an air suction pipe and an exhaust pipe, the compressor further comprises a refrigerant circulating device, the refrigerant circulating device comprises an air storage box arranged on the compressor shell, a first pipeline, a second pipeline and an exhaust pipeline, one end of the first pipeline is connected with the air storage box, the other end of the first pipeline is connected with the air suction pipe, and the first pipeline is connected with the air suction pipe in an on-off manner; one end of the second pipeline is connected with the air storage box, the other end of the second pipeline is connected with the exhaust pipe, and the second pipeline is connected with the exhaust pipe in an on-off manner; and one end of the exhaust pipeline is connected with the air storage box, the other end ofthe exhaust pipeline is connected with the air suction pipe, and the exhaust pipeline is connected with the air suction pipe in an on-off manner. The compressor solves the problem that the temperatureof a compressor cannot be adjusted in the prior art.

The invention provides a condensing unit, a liquid spraying control method and device of the condensing unit and an air conditioner. The liquid spraying control method comprises the steps that after the condensing unit starts a first adjusting valve on a main liquid spraying branch to spray liquid, operation parameters of the condensing unit are obtained; judging whether the operation parameters meet preset conditions or not; and when the judgment result is yes, the condensing unit is controlled to open a second adjusting valve on the auxiliary liquid spraying branch to adjust the liquid spraying amount together with the first adjusting valve. According to the liquid spraying control method, the two adjusting valves are used for jointly coordinating to spray liquid, accurate control over the liquid spraying amount of the condensing unit is achieved, compressor shutdown caused by insufficient liquid spraying amount is prevented, and suction liquid carrying caused by excessive liquid spraying amount is prevented; the refrigerating capacity loss caused by too large liquid spraying amount is reduced; and moreover, the liquid spraying amount range is controlled more widely, the adaptability of the unit is improved, and comfortable operation can be maintained under the high-pressure-ratio working condition.