54results about How to "Solve defrosting problems" patented technology

The invention discloses a dual heat-source heat-pump hot water device with an extremely simple refrigerating loop. The device is characterized by mainly comprising a compressor, a hot water condenser, a wind heat exchanger, a water heat exchanger, a four-way valve, a bidirectional throttle and the like, wherein a high pressure inlet of the four-way valve is connected with the outlet of the hot water condenser, and the other three ports thereof are connected with air inlets of the wind heat exchanger, the water heat exchanger and the compressor respectively; other ports of the wind heat exchanger and the water heat exchanger are connected with the bidirectional throttle; the exhaust port of the compressor is connected with the inlet of the hot water condenser, and is connected with high pressure air inlet of an electromagnetic pilot valve of the four-way valve; four functions of manufacturing hot water by utilizing water source or air energy and providing air-conditioning cool water by utilizing air-cooling or heating water can be realized by only switching the four-way valve, defrosting can be performed completely and quickly; and a water pre-heater is added to the device to reclaim the heat of waste hot water. The heat pump has the advantages of dual heat sources compensation and wide application range, has multiple functions, extremely simple structure, extremely convenient switching and over 5 of annual comprehensive energy efficiency ratio, and has great popularization value.

The invention relates to a heat pump hot water unit with in-water cycling heat exchanging loop, comprising refrigerant loop system, water-refrigerant heat exchanging system, signal collection and circuit control system. It is characterized in that the water-refrigerant heat exchanging system adopts forced internal-cycling loop constituted by water-refrigerant heat exchanger, reflux tube and internal-cycling pump or natural internal-cycling loop which uses diversion sleeve to separate spiral heat exchanger in heat storing water tank and water pre-heating device can be collocated; the refrigerant loop system has single cycling of single air heat source, independent cycling of double heat source with four functions and adopts the structure of three-way electromagnetic valve with pneumatic valve, four-way valve and multiple-path restrictor so as to make switch of all cycles convenient; wind-cold heat exchanger also has water fin tube. The unit efficiency of invention is high and defrosting in winter is complete. Pressure can not be overloaded in summer. Hot water in 55deg.C can be supplied quickly and continuously. Waste heat can be reclaimed or solar hot water can be made use of. It can save energy by 70-85% compared with electric water heater in annual average. The independent cycling unit with double heat source has refrigeration, heating, heating water and heating water with refrigeration functions.

The invention discloses a battery pack heat management device by employing a liquid medium. The device has a perfect battery pack heat management function, and according to the device, the heating and radiating of a battery pack can be finished, so that the battery pack always works in an optimal temperature range, the temperature of each battery unit can be accurately managed, and the time required for heating the battery pack is obviously shortened; and therefore, the consistency and good performance of the battery pack can be well guaranteed. The battery pack heat management device employing the liquid medium mainly comprises a liquid cooling box, an electronic fan, a liquid medium, a thermostat, a secondary liquid tank, a semiconductor and temperature sensor unit, a battery box temperature sensor, a battery unit, an outer battery box shell, a battery box insulation layer, an inner battery box shell, an electric pump, a battery management unit, a heating module and the like.

The invention discloses a solution-spraying type air-conditioner heat pump unit, belonging to the field of refrigerating air-conditioning equipment. The solution-spraying type air-conditioner heat pump unit is technically characterized in that with the adoption of the solution spraying, the unit diffuses condensation heat to the environment in summer and takes heat from the outdoor air environment in winter; and the solution is regenerated by the using of exhausted gas of the compressor or hot water manufactured by the unit. Compared with an air source heat pump unit, the solution-spraying type air-conditioner heat pump unit has the obvious characteristics that the refrigeration efficiency is high, the continuous heating operation can be realized without defrosting in winter and the heating efficiency is high, and in addition, the structure of the unit is compact and the early-investment of the equipment is low.

The invention relates to an icebox and a control method thereof. The icebox comprises a box body, a box door, a refrigeration chamber evaporator, a refrigeration chamber blower and a freezing chamber evaporator, wherein a refrigeration chamber, a variable-temperature chamber, a freezing chamber and a refrigeration chamber duct are restricted in the box body, the variable-temperature chamber is arranged between the refrigeration chamber and the freezing chamber and separated from the refrigeration chamber by a variable-temperature chamber separator, the refrigeration chamber duct is arranged behind the refrigeration chamber, the upper end of the refrigeration chamber duct is communicated with the refrigeration chamber by an air outlet of the refrigeration chamber, the lower end of the refrigeration chamber duct is communicated with the variable-temperature chamber by an air return opening of the refrigeration chamber, the front side of the box body is provided with an opening which is opened or closed by the box door mounted on the box body, the refrigeration chamber evaporator is arranged outside the refrigeration chamber duct, the refrigeration chamber blower is arranged at the air outlet, and the freezing chamber evaporator is arranged in the freezing chamber. The icebox can satisfy the user requirement for sorting foods by kinds and storing foods by temperature areas and has simple structure, great storage space, sanitary food storage and low energy consumption, noise and production cost.

The invention relates to a solution spray type heat pump set, belonging to the field of refrigerating and air conditioning equipment. The solution spray type heat pump set has the technical characteristics that the set radiates condensed heat to the environment in summer and takes heat from the outdoor air environment in winter by using solution spray, and the solution is regenerated by using heat released by recooling a high-pressure liquid refrigerant. Compared with an air source heat pump unit, the solution spray type heat pump set has the obvious characteristics of compact set structure, low initial equipment investment, high energy efficiency ratio for refrigeration operation in summer, no need of defrosting in winter, efficient, continuous and stable refrigeration operation and the like.

The invention relates to a dehumidifier dehumidity unit, concretely an entirety type dehumidifier dehumidity unit, comprising fan blade, water collector, compressor, condenser, evaporator, and throttle capillary tube, all of which are linked to construct a dehumidifier dehumidity device, and a precooling condenser is connected in series between the exhaust outlet of condenser and inlet of condenser. The invention whose structure is simple and reasonable can increase condensing effect of the condenser, decrease energy needed and realize high efficient dehumidify, and it can work safely with high efficiency in hot temperature condition; and the added condensation water heat regenerator reuses the power of low temperature condensation water, solving the possible problem that water droplet condensed on waste pipe or water tank falling in room caused by discharging condensation water; the defrosting problem of working under low temperature can also be solved by using defrosting valve or solenoid valve.

The invention relates to a refrigeration system treatment method, a refrigeration system using the refrigeration system treatment method and an electrical appliance with the refrigeration system, wherein the refrigeration system treatment method is mainly characterized in that at least one purpose of combinations of any two or more of enhanced heat transfer, defrosting and frosting control, clearing, moisturizing and refreshment is achieved by the refrigeration system through a gas injection component treatment method; the refrigeration system using the refrigeration system treatment method comprises a heat exchanger and a valve and a compressor which are connected with the heat exchanger and is also provided with a refrigeration system control part and a functional structural part which are matched with the refrigeration system; the refrigeration system has the main characteristic that at least one component in the refrigeration system is provided with one or more treatment nozzles; and compressed gas supply is external compressed gas supply or compressed gas supply from a pressure gas bottle, a fan or a compressor or combination of any two or more thereof respectively and is at least one of the situations.

The invention discloses a hot water air-conditioner. An indoor heat exchanger and an outdoor heat exchanger are connected with a compressor by a first pipeline and a second pipeline selected by a four-way reversing valve; the indoor heat exchanger and the outdoor heat exchanger are connected by a third pipeline; a water-side heat exchanger is arranged on a fourth pipeline in parallel connection with the second pipeline. The invention also comprises a fifth pipeline and a sixth pipeline with one end both connected with the third pipeline and the other end respectively connected with one side of the water-side heat exchanger in the fourth pipeline; a first control valve on the sixth pipeline; a second control valve arranged on the second pipeline and between two node of the fourth pipeline and the second pipeline; a third control valve arranged on the fourth pipeline and between first nodes of the fourth pipeline and the second pipeline and the water-side heat exchanger; a fourth control valve on the fifth pipeline; a fifth control valve arranged on the fourth pipeline and between second nodes of the fourth pipeline and the second pipeline and nodes of the fourth pipeline and the fifth pipeline. The invention achieves the functions of cooling, heating, water heating, cooling + water heating and heating + water heating.

The invention relates to a air-cooled cold water heat pump air-conditioner hot water system which comprises a air-conditioner hot water main system, wherein the air-conditioner hot water main system comprises a compressor, a four-way reversing valve component, a fin heat exchanger, a blower component, an electronic expansion valve component, an air-conditioner side reservoir, an air-conditioner side heat exchanger, a gas-liquid separator, a hot water heat exchanger, a hot water side reservoir and a non-return valve which are in connection through a pipeline, wherein the compressor is a general compressor or an enhanced vapor injection (EVI) compressor. The hot water system not only realizes the functions of refrigeration, heating, air-conditioner refrigeration heat recovery and separated water heating, but also achieves two defrosting manners so as to solve the defrosting problem under different application conditions; meanwhile, as the EVI technology is adopted, the hot water system can normally carry out heating or water heating under an extremely-low temperature environmental of subzero 5 to subzero 25 DEG C, and the heating water temperature can reach 55 DEG C, even 60 DEG C to the highest; and the hot water system, with the characteristic of energy conservation, can replace both electric water heaters and the gas water heaters.

The invention provides a defrosting method of a variable-frequency air source heat pump unit. The defrosting method comprises the following steps that when a defrosting condition is reached, a compressor is reduced to the lowest frequency and kept for 5 seconds, a defrosting mode is started, the frequency of the compressor is increased to the defrosting frequency, the expansion opening degree is adjusted to the defrosting opening degree, then the defrosting frequency is reduced by 5Hz every 30 seconds, the defrosting opening degree is reduced by 4%, and the adjustment is stopped until the frequency is reduced to the defrosting lower limit frequency; and the air exchange temperature, the unit high-pressure value and the defrosting duration are monitored, when any one of the three parametersexceeds a set value, the unit exits the defrosting mode, the frequency of the compressor is reduced to the lowest frequency and kept for 5 seconds, a fan is started and waits for 5 seconds, and the unit is switched back to normal heating. The method can reduce the defrosting switching impact of the air source heat pump, improves the unit safety, and reduces the noise. Meanwhile, the real-time matching of the defrosting heat demand and the unit heat supply can be kept, the total defrosting time is shortened, and the defrosting energy consumption is reduced.

The invention relates to an efficient and intelligent heat pump air conditioning system for an electric automobile. The purpose is that the provided air conditioning system has the characteristics of high efficiency, energy-saving property, low cost and high reliability and heat circulations of an electric automobile drive system and the heat pump air conditioning management system are managed in an integrated way. The technical scheme is that the efficient and intelligent heat pump air conditioning system for the electric automobile is characterized by comprising a motor circulation water main system and an intelligent heat pump air conditioning master controller, wherein the motor circulation water main system is formed in such a way that a water pump, a first three-way solenoid valve, a first electronic expansion valve and a first heat exchanging loop of a motor heat exchanger are in communication with each other in a circulation in sequence through water pipes; circulation water temperature sensors are mounted on the water pipes; and the intelligent heat pump air conditioning master controller obtains the temperature of the circulation water through the circulation water temperature sensors so that the opening degree of the first electronic expansion valve is controlled to realize effective heat radiation of a motor driving system.

The invention discloses an air-energy heat pump water heater. The air-energy heat pump water heater comprises a heat exchanger, namely a heat exchange sleeve, a water storage tank, a water flow sensor, a wall-hanging stove two-position three-way valve, electric control equipment, corresponding connecting pipes and corresponding valve pieces; the heat exchange sleeve is composed of a water pipe and a refrigerant metal pipe, and the refrigerant metal pipe in the heat exchange sleeve penetrates the middle portion of the water pipe of the heat exchange sleeve to be coiled to into a cylinder so as to be arranged outside an inner container of the heat retaining water storage tank in a sleeving manner and arranged in a heat retaining layer of an outer shell of the water storage tank in a sleeved manner; the refrigerant pipe in the heat exchange sleeve of the heat exchanger is connected with a throttle valve, an evaporator and a heat pump compressor through metal pipes, and therefore an overall heat pump heating system loop is formed; and the heat exchange sleeve is further composed of two parts including a high temperature heat energy rapid convection release area and a medium and low temperature heat energy slow liquidation release area. According to the air-energy heat pump water heater, the energy efficiency ratio of hot water produced by a heat pump is high, the water producing temperature within rated power of the heat pump is high, the problem of defrosting of the heat pump water heater in winter is solved, and the air-energy heat pump water heater has the beneficial effects of being small in size of the water storage tank, low in cost, long in service life and the like.

The invention discloses a heat-pump water heater which comprises an indoor portion and an outdoor portion. The indoor portion comprises a water tank with a heat exchanging device and an evaporator connected with the heat exchanging device through a compressor. The outdoor portion is provided with an outdoor evaporator connected with the evaporator in parallel, one node of parallel connection is connected with a pipeline through a two-position three-way valve, and the outdoor portion comprises a temperature sensor for driving the two-position three-way valve to be switched. By means of the heat-pump water heater, a purpose of defrosting the evaporator is achieved.

The invention provides an integrated thermal management system of a pure electric vehicle and the vehicle. The system comprises a controller, a two-position four-way control valve, a passenger compartment thermal management loop, a battery thermal management loop, an electric drive system thermal management loop and a heat dissipation loop, wherein the electric drive system thermal management loop and the heat dissipation loop are communicated. A three-way control valve group connected with the controller is arranged in the passenger compartment thermal management loop so as to change the flowing direction of a refrigerating medium in the passenger compartment thermal management loop; a refrigerating medium channel of the battery thermal management loop is communicated with the passenger compartment thermal management loop through a group of three-way proportional control valves, and a cooling liquid channel of the battery thermal management loop is communicated with the electric driving system thermal management loop through the two-position four-way electromagnetic valve; the controller achieves cooling or heating management of a passenger compartment, cooling or heating management of a battery pack and cooling of an electric drive system by controlling the three-way control valve set, the two-position four-way control valve and the first three-way proportional valve set.

The invention discloses a reversing-defrosting air source heat pump unit and a reversing defrosting method. The reversing-defrosting air source heat pump unit comprises a compressor, outdoor heat exchangers, a fan, an indoor heat exchanger, a gas-liquid separator, a first four-way reversing valve and a throttling mechanism. The outdoor heat exchangers are composed of the first outdoor heat exchanger and the second outdoor heat exchanger. A second four-way reversing valve is arranged in the unit to change the flowing direction of a refrigerant. Connectors of the second four-way reversing valve are connected with the throttling mechanism, the first outdoor heat exchanger, the second outdoor heat exchanger and the first four-way reversing valve correspondingly. By means of the reversing-defrosting air source heat pump unit and the reversing defrosting method, the defect that defrosting and heating cannot be conducted simultaneously according to a traditional defrosting mode of an air source heat pump unit is effectively overcome; during defrosting operation of an air source heat pump, the indoor temperature cannot be lowered, and thus comfortableness of indoor people is effectively improved; and through the second four-way reversing valve, multiple modes including refrigeration, heating, heating and reversing defrosting, and the like can be switched to operate.

The invention provides an air conditioner defrosting control method and device. The air conditioner defrosting control method comprises the steps that under the condition that an air conditioner unitis in the heating mode, the saturation temperature corresponding to the low pressure of the unit is detected; and under the condition that the saturation temperature corresponding to the low pressureis lower than a preset frosting temperature, according to the external environment temperature of the air conditioner unit and the saturation temperature corresponding to the low pressure, whether defrosting is conducted or not is determined. By the adoption of the air conditioner defrosting control method, the technical problem that by the adoption of an existing defrosting control manner, the precision is low is solved, and the purpose of effectively improving the defrosting control precision is achieved; besides, it is avoided that defrosting is conducted once the saturation temperature islower than the preset frosting temperature, whether defrosting is needed or not is further confirmed, and the problem that defrosting is conducted under the condition of no frost is avoided.

At present, the conventional ship fan evaporators use hot air to melt frost, a ship keeps inclination sailing during a period due to waves, and then water gathered in a water holding disc cannot be drained completely, an ice layer will cover the water holding disc after a few of frost melting cycles, the drainage opening will be blocked, and a frost melting system will fail. The ship fan evaporator is different from the conventional an evaporators using hot air to melt frost, and is characterized in that a plurality of seamless tubes as heating coils are arranged under a water holding disc according to the area of the water holding disc, the heating coils heat the water holding disc during a frost melting process all the time so as to prevent frost molten water from freezing, and the frost molten water can be smoothly drained out from a drainage opening.

The invention discloses a self-adaptive ultra-low temperature refrigeration air conditioner, which comprises a refrigeration system formed by a compressor, a condenser, a capillary and a steamer; and an electric control system formed by circuit control board and sensor. Wherein, the electric control chip of said circuit control board is fixed with indoor defrost program; said sensor is a thermal sensitive resistance which is connected to the pin of indoor defrost program. When the air conditioner is in low-temperature refrigeration mode, the thermal sensitive resistance feeds the signal back to the electric control chip, via the change of environment temperature to judge if the indoor steamer is frosted; and when meeting the defrost condition, using the rotational speed of outer motor or changing the operation mode (as from the refrigeration operation mode to heating operation mode) to process defrost operation. The invention has simple structure and lower cost.

A small scale constant temperature freezer is made of frequency changing refrigerating system, second coolant circulation system, temperature compensation and defroster control mechanism, to maintain the constant temperature of the load body, the merit of the frequency changing freezer, meeting the requirement of temperature control precision of the constant temperature freezing system, solving defrosting problem, and arriving the goal of small scale constant temperature control with mutual cooperation.

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 relates to a heating system for garage type dry fermentation and an operation control method thereof. Based on the concept of utilization of energy generated by microbial self-heating, partial utilization of hot water generated by an auxiliary heater, comprehensive utilization of energy cascade and system energy consumption coefficient (COPs) in a dry anaerobic fermentation process, a spiral coil heat exchanger is used for preheating outdoor air led in at the worst operating condition, the auxiliary heater utilizes an electric boiler to heat an auxiliary heating loop, an air source heat pump unit improves a low grade heat source (air) to a high grade heat, and the heating system for the garage type dry anaerobic fermentation can achieve a air source heat pump direct heating mode and an air source heat pump-electric boiler combined heat supply heating mode. The operation control method of the heating system solves the problem that system modes switch optimal operation automatically under different weather conditions so as to achieve economy, energy conservation and environment protection of the whole system, and contributes to promote development and industrialization process of dry anaerobic fermentation engineering rapidly.

The invention discloses a water heat accumulation defrosting type condensation type radiant panel heating device which comprises a heating pipeline and a wall-hung condensation type radiant panel; theheating pipeline comprises a heating dry pipe and a heat regenerative dry pipe, each of which is provided with a branching device, a temperature pressure sensor and a control regulating valve; the wall-hung condensation type radiant panel comprises a shell and a serpentine heating coil which is arranged in the shell; a space between the shell and the serpentine heating coil is a water accumulation layer; the shell is a galvanized steel sheet; the outer surface of the shell is coated with an infrared radiation coating in a brushing manner; an air interlayer is arranged between the rear surfaceof the wall-hung condensation type radiant panel and a wall body; the heating dry pipe is connected with water inlets of a plurality of heating pipes through the branching device; and the heat regenerative dry pipe is connected with water return holes of a plurality of heating pipes through the branching device. By adopting the water heat accumulation defrosting type condensation type radiant panel heating device provided by the invention, the water accumulation layer enables the whole radiant panel to be uniform in temperature, strengthens indoor convective heat transfer and can better meetthe requirement for human thermal comfort; and meanwhile, a unit is avoided from directly absorbing heat from the indoor, and the problem that a temperature in a defrosting room is reduced is eased.

The invention discloses a liquid heat exchange type air source heat pump and relates to the technical field of air source heat pump systems. The liquid heat exchange type air source heat pump comprises a liquid heat source heat pump, a heat source liquid inlet pipeline, a heat source liquid return pipeline, an air liquid heat exchanger and a closed air channel. A heat exchange pipeline in the liquid heat source heat pump communicates with a heat exchange pipeline in the air liquid heat exchanger through the heat source liquid inlet pipeline and the heat source liquid return pipeline. A circulating pump is further arranged in the heat source liquid inlet pipeline or the heat source liquid return pipeline. The circulating pump drives heat exchange liquid to flow from the inside of the heat source liquid return pipeline to the liquid inflow end of the air liquid heat exchanger. An air pre-heat-exchange chamber is arranged at an air inlet of the closed air channel. One part of the heat source liquid return pipeline is arranged in the air pre-heat-exchange chamber. The air liquid heat exchanger is arranged on the non-air-pre-heat-exchange chamber part of the closed air channel. The problems of frosting and freezing of the heat pump and the cold island effect formed when the air source heat pump is arranged on a large scale are solved, large-area heat exchange can be achieved, the popularization degree is high, and practicability is high.

The invention relates to a refrigeration system, in particular to a refrigeration system for a three-door multi-temperature-zone refrigerator. The invention also relates to a refrigerator, in particular to a three-door multi-temperature-zone refrigerator with the refrigeration system. The variation range of temperature of a variable temperature zone is increased, and the defrosting problem and large temperature difference problem are effectively solved. The three-door multi-temperature-zone refrigerator is provided, and the refrigeration effect of the refrigerator is optimized. The three-door multi-temperature-zone refrigerator comprises a fresh-food storage compartment, a variable temperature compartment, a freezer and a refrigeration system, wherein the refrigeration system comprises a refrigeration loop, a variable temperature refrigeration loop and a freezing refrigeration loop, and the three refrigeration loops are respectively used for refrigeration of the fresh-food storage compartment, the variable temperature compartment and the freezer of the refrigerator; and the variable temperature refrigeration loop is at least provided with two branches, one is a refrigeration variable temperature branch, and the other is a freezing variable temperature branch; and the variable temperature branch loops comprise evaporators. The refrigerator provided by the invention has the beneficial effects that the variable temperature compartment refrigeration loop is provided with at least two variable temperature branches, each branch can be controlled for refrigeration according to the actual needs, the defrosting problem and the large temperature difference problem can be effectively solved, and the refrigeration effect of the refrigerator is optimized.

The invention discloses a transcritical carbon dioxide single-stage and double-stage compression hot water system and a control method thereof. The system comprises a first-stage compressor, a first heat exchanger used for exchanging heat with user side cooling water, a second-stage compressor, a second heat exchanger used for exchanging heat with user side cooling water, a third heat exchanger used for exchanging heat with a liquid-phase refrigerant and a gas-phase refrigerant, an expansion valve, a fourth heat exchanger used for exchanging heat with ambient air, a buffer water tank and a first proportional valve. A first proportional valve, a second proportional valve, a third proportional valve, a fourth proportional valve, a defrosting valve, a refrigerant path bypass valve and the like; the system realizes intelligent switching of single-stage and double-stage transcritical operation under variable working conditions, has outstanding heating capacity and energy efficiency ratio under all working conditions, remarkably improves the comprehensive performance of preparing high-temperature hot water under a low-temperature environment, and also solves the defrosting problem and the oil return problem of a double-stage compression hot water system.

The invention provides a low-temperature dehumidifier for a refrigeration house. The low-temperature dehumidifier for the refrigeration house comprises an indoor unit and a machine body. An air supplyopening of the machine body is provided with a centrifugal fan. An outlet pipe of a dehumidification reheater is sequentially connected with a filter, an electromagnetic valve and an expansion valve.An inlet of the expansion valve is connected with the electromagnetic valve, and an outlet of the expansion valve is connected with an evaporator. A defrosting reversing valve is a four-way valve, afirst outlet of the defrosting reversing valve is connected with an exhaust port of a vortex compressor, a second outlet of the defrosting reversing valve is connected with the dehumidification reheater, a third outlet of the dehumidification reheater is connected with an air return pipe of the evaporator, and a fourth outlet of the defrosting reversing valve is connected with an air inlet of thevortex compressor. One end of a high-pressure controller is connected with the defrosting reversing valve, and the other end of the high-pressure controller is connected with the vortex compressor. One end of a gas-liquid separator is connected with the vortex compressor, and the other end of the gas-liquid separator is connected with a low-pressure controller. The application range of the low-temperature dehumidifier is expanded, and the low-temperature dehumidifier can reliably run in the refrigeration house where the temperature ranges from 0 DEG C to 10 DEG C.

The invention discloses a six-way valve. The six-way valve comprises a valve body (12) which is provided with an upper cover (11) and a lower cover (13); the six-way valve is characterized in that the side wall of the valve body (12) is evenly provided with a channel A, a channel B, a channel C, a channel D, a channel E and a channel F, a valve element (14) is arranged in the valve body (12), a fan-shaped positioning ring groove (19) is formed in the lower portion of the valve element (14), and the upper portion of a limiting screw (18) on the upper surface of the lower cover (13) is installed in the positioning ring groove (19); a hole is formed in the middle of the valve element (14), a valve rod (15) is installed in the hole, and the lower end of the valve rod (15) is installed in a blind hole in the lower cover (13); the upper portion of the valve rod (15) is installed in a through hole of the upper cover (11), and a hard sealing piece (8) and a soft sealing piece (9) are installed between the through hole and the valve rod (15); and a sealing cover (16) is installed on the upper cover (11) and tightly presses a sealing gasket (10). The problem of defrosting of an air-conditioner refrigeration house can be solved through one valve, the valve set structure is abandoned, the structure is simpler, installation is easier, and the cost is substantially reduced.