1069 results about "Four-way valve" patented technology

An improved heat pump including an integrated system for the management of refrigerant charge is provided. The integrated system actively adjusts charge allocation and thereby optimizes operational efficiencies in all modes of operation. In one embodiment, the integrated system includes three four-way valves, two expansion valves, two one-way check valves, and a suction line accumulator to optimize charge allocation. The four-way valves dictate the mode switch and refrigerant flow directions, and the expansion valves automatically allocate refrigerant mass in active components and store excess charge in an idle heat exchanger and suction line accumulator by controlling the compressor discharge pressure (equivalent to controlling condenser subcooling degree) as a function of the entering air and water temperatures. The integrated system provides seven working modes and is uniquely suited for spacing cooling, spacing heating, and water heating in both residential and commercial applications.

Disclosed is a hydraulic control system for safe rapid opening or closing of a valve. The hydraulic control system comprises a hydraulic cylinder (71), a pressure oil line (141), an oil return line (151), an oil drain line (161), a quick oil return line (171) and a valve manifold (181), wherein the inside of the valve manifold is provided with a three-position four-way directional control valve (51), a bidirectional hydraulic lock (31), a first two-position four-way directional control valve (61) and an energy accumulator (191); a first cartridge valve (101) is connected between the oil drain line and a rod cavity of the hydraulic cylinder, and a pilot port of the first cartridge valve is connected to a port A of the first two-position four-way valve; an oil inlet of the energy accumulator is connected to each of the pressure oil line and the oil return line, a first check valve (81) is connected between the oil inlet of the energy accumulator and the pressure oil line, and a second cartridge valve (102) is connected between the first check valve and the energy accumulator; and the second cartridge valve is connected to a rodless cavity of the hydraulic cylinder, and a pilot port of the second cartridge valve is connected to the port A of the first two-position four-way directional control valve. The hydraulic control system for safe rapid opening or closing of a valve allows for safe rapid opening or closing of a valve.

The utility model discloses a humidifying and dehumidifying machine, comprising a casing, a compressor installed in the casing, a condenser, an evaporator, a fan assembly, a water tank, a four-way valve and a water sprinkling assembly, wherein the four-way valve is respectively connected to the compressor, the condenser and the evaporator, and the water sprinkling assembly comprises a water pump, a spray head, a water outlet pipe respectively connected to the water pump and the spray head, and a water inlet pipe respectively connected to the water pump and the water tank, the spray head is arranged above the condenser and the evaporator, and the water tank is arranged below the condenser and the evaporator. The utility model has humidifying and dehumidifying functions, a simple structure, good humidifying effect, saves costs for consumers, and reduces occupied space.

The utility model discloses a four-way valve assembly, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The four-way valve assembly comprises a valve body and a filtering device, the valve body comprises a main valve pipe and a first pipe joint, a second pipe joint and a third pipe joint which are connected to the main valve pipe, the first pipe joint is used for communicating with an exhaust port of the compressor, the second pipe joint is used for communicating with an air return port of the compressor, and the third pipe joint is used for communicating with the heat exchanger; the filtering device is installed on the third pipe connector and used for filtering the refrigerant flowing through the third pipe connector. The filtering device is directly installed on the third pipe connector, so that the filtering device can filter a refrigerant flowing through the third pipe connector, a middle pipeline between the filtering device and the third pipe connector is omitted, and therefore the machine body structure of the outdoor unit of the heating and ventilation equipment can be simplified to a certain degree, and the overall size of the machine body is reduced; and a certain production and manufacturing cost can be reduced.

The invention relates to the technical field of automobile heat management, in particular to a multi-loop integrated heat management system and method for an electric automobile. Comprising a first electronic water pump, a second electronic water pump, a refrigerating device, a first temperature sensor, a second temperature sensor, a pressure sensor, a third temperature sensor, a fourth temperature sensor, a fifth temperature sensor, a first pressure temperature sensor, a second pressure temperature sensor, a first electronic expansion valve, a second electronic expansion valve, an evaporator, a fan and a compressor. According to the system, on the basis of an existing whole vehicle air conditioning system, an air-cooled condenser is replaced with the water-cooled condenser, a three-way valve, an integrated battery, the motor, the controller of the motor and a passenger compartment heat management system are removed, the motor is comprehensively utilized for preheating, the energy utilization rate is increased, and the energy consumption is reduced. The endurance mileage of the whole vehicle is improved, and the complexity of the system is reduced.

The invention discloses a crankcase air supply system, a crankcase air supply control method, a controller and a vehicle, and relates to the field of hydrogen internal combustion engines. The crankcase air supply system comprises a first air supply pipeline communicating with an air outlet of a supercharger and a first end of a four-way valve, and a second air supply pipeline communicating with an air outlet of a pressurized air storage tank and a second end of the four-way valve; the air outlet of the air filter of the hydrogen internal combustion engine is communicated with the third end of the four-way valve, the four-way valve is communicated with the air supply port of the crankcase, and when the hydrogen internal combustion engine is in a high-load and high-moisture state, the opening degree of the first flow adjusting valve is controlled to be larger than that of the second flow adjusting valve. The opening degree of the second flow adjusting valve is larger than that of the third flow adjusting valve. The method is implemented on the basis of the supercharger, the pressurized gas storage tank and the air filter, and the opening degree of each flow regulating valve is regulated, so that the inlet gas water content is reduced while the gas supplementing requirement of the crankcase is met, and the aim of improving the operation reliability of the hydrogen internal combustion engine is achieved.

The utility model discloses a silencer and an air conditioner. The silencing device is applied to the air conditioner, the air conditioner comprises an indoor heat exchanger, an outdoor heat exchanger, a four-way valve and a compressor, the inlet end of the silencing device is communicated with the exhaust end of the compressor, the outlet end of the silencing device is connected with the four-way valve, and the silencing device comprises at least two silencing branches. Each silencing branch is correspondingly provided with a silencer, and the connection relation between different silencers can be changed; and the controller is used for controlling the connection relationship between different silencers in the silencing device, so that the silencing parameters of the silencing device are changed, and the silencing amount of the silencing device is changed. By means of the air conditioner, noise of different frequencies can be reduced, the noise between the indoor part and the outdoor part of the air conditioner can meet the noise requirement, and the user experience is improved.

The invention provides a heat pump non-stop defrosting control method and system based on double-evaporator cooperative control, and the method comprises the steps: building a temperature difference response change rate index by collecting the refrigerant inlet and outlet temperatures of two groups of fin heat exchangers in real time, and recognizing a side needing to be defrosted and a heating side; an electronic expansion valve, a fan and an electromagnetic valve are dynamically configured, so that the side needing to be defrosted enters a static defrosting mode, and the heating side continuously supplies heat; the frequency rising of the compressor and the switching of the four-way valve are cooperatively adjusted, and small-flow pre-balancing is executed before reversing so as to restrain pressure impact; and after defrosting is completed, it is judged that defrosting is finished based on the thermal response state and the heat change trend, the side needing defrosting is controlled to be reset, and heating is started again. Uninterrupted heat supply of the user side in the defrosting process is achieved, water temperature fluctuation and energy consumption are remarkably reduced, and the operation stability and energy efficiency of the heat pump in the low-temperature and high-humidity environment are improved.

The invention provides an air source heat pump system. The air source heat pump system comprises a compressor, a fin heat exchanger, a shell tube heat exchanger and a gas-liquid separator, wherein the shell tube heat exchanger comprises a gas tube, a liquid tube, a heat exchange tube and a liquid separating device, the air source heat pump system further comprises a four-way valve, the four-way valve is correspondingly communication with the compressor, the gas-liquid separator, the fin heat exchanger and the gas pipe, the fin heat exchanger is in communication with the liquid separating device through a orifice plate and a first one-way valve; the fin heat exchanger is in communication with the liquid tube through an expansion valve and a second one-way valve; the first one-way valve is used for the one-way conduction of the fin heat exchanger to the liquid separating device; the second one-way valve is used for the one-way conduction of the liquid pipe to the fin heat exchanger. By the adoption of the system, a liquid storage device of the liquid refrigerant does not need to be added in the system, so that the cost is saved; a large amount of liquid refrigerant cannot flow back to the compressor after defrosting is finished; during the refrigeration mode, the refrigerant running shell pass does not need to be subjected to suction superheat, so that the air suction pressure and the operation efficiency of the refrigeration mode are improved; and the overall use valve of the system is less, and the reliability is high.

The invention provides a wide-temperature-range and low-energy-consumption integrated thermal management system for a hovercar. The hovercar integrated heat management system comprises a battery, a motor, an electric controller, an out-cabin radiator, an in-cabin warm air / cold air core body, first to sixth three-way valves, a four-way valve, first to second liquid storage tanks, first to third oil pumps, a gas-liquid separator, a compressor, a condenser, an expansion valve, a plate heat exchanger and the like. Through mutual cooperation and cooperation of the electrically-driven heat dissipation main pipeline, the electrically-driven heat dissipation branch pipeline, the battery heat dissipation main pipeline, the battery heat dissipation first branch pipeline, the battery heat dissipation second branch pipeline and the steam compression circulation pipeline, the heating and heat dissipation requirements of a passenger compartment, the electrically-driven heat dissipation requirement and the battery heat dissipation requirement can be met at the same time, and the system architecture is highly integrated; while the energy utilization efficiency of the whole vehicle is improved, the lightweight level of the whole vehicle is also improved.

The invention relates to the technical field of rare earth ore flotation, in particular to a rare earth ore efficient flotation separation device which comprises a box body and a discharging pipe connected to the box body, an installation plate is fixedly connected to the box body, a feeding pipe located in the box body is fixedly connected to the installation plate, and a four-way valve connected with the feeding pipe is installed on the box body. A baffle is slidably connected to the box body. The stirring shaft and the porous plate rotate to stir ore pulp and a reagent, so that the ore pulp and the reagent are fully contacted and reacted, generated bubbles are fully contacted and mixed with minerals in the ore pulp, the minerals and the bubbles are fully adsorbed, and the bubbles drive the minerals to move upwards and float on the liquid surface to form a foam layer to complete flotation separation; and then the liquid level sensor detects the height of the liquid level and controls the electric lifting frame to move, so that the electric rotating cylinder drives the scraping plate to move up and down to make contact with the foam layer all the time for scraping, the scraping plate is prevented from being separated from the foam layer to affect scraping, and the mineral collecting effect is improved.

The utility model discloses a four-way valve assembly, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The four-way valve assembly comprises a valve body, a plurality of electric appliance parts and a switching part, the plurality of electric appliance parts are in telecommunication connection with the switching part through a first line, and then the switching part is in telecommunication connection with the control device through a second line, so that telecommunication connection between the plurality of electric appliance parts and the control device is achieved. Compared with an original mode that a plurality of electric appliance parts are in one-to-one telecommunication connection with the control device through a plurality of circuits, the complexity of the circuits can be reduced, so that the internal space of a machine body of the outdoor unit of the heating and ventilation equipment is saved, and the size and the production cost of the machine body are reduced.

The present invention discloses a thermal management system and an automobile. The thermal management system includes a refrigerant circuit and a water circuit. The refrigerant circuit contains liquid refrigerant and includes multiple components, including a compressor, a first heat exchanger, a second heat exchanger, a condenser, a first evaporator, a second evaporator, a first expansion valve, a second expansion valve, and a third expansion valve, forming a corresponding circuit as needed. The water circuit contains coolant and includes multiple components, including the first heat exchanger, a first water pump, a drive assembly, a first four-way valve, a second four-way valve, a battery assembly, a second water pump, a three-way valve, and the second heat exchanger, forming a corresponding circuit as needed. The technical solution of the present invention simplifies the thermal management system and reduces overall vehicle energy consumption.

The invention provides air conditioning equipment and a control method and device thereof. The outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchange assembly, a first middle heat exchange assembly and a second middle heat exchange assembly; the refrigerant pipeline comprises a refrigerant main path, a first branch path and a second branch path, the first branch path and the second branch path are connected in parallel and communicate with the refrigerant main path, a first middle heat exchange assembly and a second middle heat exchange assembly are arranged on the first branch path and the second branch path correspondingly, and an outdoor heat exchange assembly is arranged on the refrigerant main path; a plurality of indoor units; the refrigerant pipeline further comprises a third branch, one end of the third branch is connected to the part, located between the four-way valve and the outdoor heat exchange assembly, of the refrigerant main pipeline, and the other end of the third branch is connected to the second branch. The system cost is reduced, the potential safety hazard of refrigerant leakage is avoided, and the operation efficiency is improved. And the refrigerant only circulates on the outdoor side, expensive copper pipes do not need to be used for long-distance piping from the indoor side to the outdoor side, and the cost is further reduced.

The invention provides an outdoor unit of an air conditioner, the air conditioner and a control method and device of the air conditioner. The outdoor unit comprises a compressor, a four-way valve, an oil separator and a gas-liquid separator; an inlet of the oil separator is communicated with an exhaust port of the compressor, a refrigerant outlet of the oil separator is communicated to the four-way valve, and an oil outlet of the oil separator is connected with a first oil return branch and a second oil return branch; wherein the first oil return branch is directly communicated to an air suction port of the compressor, and the second oil return branch flows through a liquid storage area of the gas-liquid separator and is communicated to the air suction port of the compressor; the first oil return branch is provided with a first electromagnetic valve, and the second oil return branch is provided with a second electromagnetic valve. According to the outdoor unit of the air conditioner, the air conditioner and the control method and device of the air conditioner, the second oil return branch passing through the liquid storage area of the gas-liquid separator is arranged, so that the oil return temperature of the air suction port of the compressor is reduced, and the problems that the gas-liquid separator is frosted and the liquid level is too high can be solved.

The invention provides a vehicle thermal management system and a vehicle. The vehicle thermal management system comprises an engine cooling loop, a low-temperature loop, a refrigerant loop, a heating loop, a seven-way valve and a two-position four-way valve. Different valve ports communicated with the seven-way valve and the two-position four-way valve are switched to be communicated with part or all of an engine cooling loop, a heating loop, a low-temperature loop and a refrigerant loop; a seven-way valve and a two-position four-way valve are arranged to be connected with an engine cooling loop, a heating loop, a low-temperature loop and a refrigerant loop, and different valve ports of the seven-way valve and the two-position four-way valve are switched and communicated according to the heat dissipation or heating requirements of all parts and spaces of a vehicle. Therefore, part or all of the engine cooling loop, the heating loop, the low-temperature loop and the refrigerant loop are communicated, multiple heat management modes are achieved, the energy of the whole vehicle is efficiently utilized on the premise that the heat management requirements of all parts of the vehicle are met, the number of the valve bodies is reduced, and the cost is reduced. Therefore, the space requirement and the complexity of the whole thermal management system are reduced.

The invention provides an air conditioner, an air conditioner defrosting control method and a readable storage medium, and is applied to the field of air conditioner control. The method comprises the steps that under the condition that the air conditioner operates in a heating mode, a defrosting signal is received; according to the defrosting signal, defrosting control is conducted on a first four-way valve, and / or a second four-way valve, and / or a first switch valve, and / or a second switch valve, and / or a first electronic expansion valve, and / or a second electronic expansion valve, and / or a third electronic expansion valve; wherein the first sub-passage is a refrigerant passage between the first outdoor heat exchanger and the first electronic expansion valve; and the second sub-passage is a refrigerant passage between the second outdoor heat exchanger and the second electronic expansion valve. According to the air conditioner, the air conditioner defrosting control method and the readable storage medium, the outdoor heat exchange unit is defrosted while continuous heating is achieved through partition defrosting, and defrosting is achieved under the condition that the system does not absorb indoor heat.

The utility model discloses a four-way valve assembly, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The four-way valve assembly comprises a four-way valve body and a first pressure detection piece, the four-way valve body comprises a main valve pipe and a first pipe connector, a second pipe connector, a third pipe connector and a fourth pipe connector which are connected to the main valve pipe, the first pipe connector is used for being connected with an exhaust port of the compressor, and the second pipe connector is used for being connected with an air return port of the compressor; the first pressure detection piece is directly installed on the first pipe joint and communicated with the first pipe joint, and the first pressure detection piece is used for detecting pressure information in the first pipe joint. The first pressure detection piece is directly installed on the first pipe connector, a middle pipeline for connecting the first pressure detection piece and the four-way valve body is omitted, and therefore the machine body structure of the outdoor unit of the heating and ventilation equipment can be simplified to a certain degree, the overall size of the machine body can be reduced, and certain production and manufacturing cost can also be reduced.

The invention provides an air conditioning system and a control method thereof. The outdoor unit comprises a compressor, a four-way valve, an outdoor heat exchange assembly, a first middle heat exchange assembly and a second middle heat exchange assembly; the first branch and the second branch are connected in parallel and communicate with the refrigerant main path, a first middle heat exchange assembly and a second middle heat exchange assembly are arranged on the first branch and the second branch correspondingly, and an outdoor heat exchange assembly is arranged on the refrigerant main path. Each indoor unit comprises an indoor heat exchange assembly connected through a medium pipeline, and the medium pipeline of each indoor unit can selectively flow through the first middle heat exchange assembly or the second middle heat exchange assembly; after the control device receives a defrosting instruction, the obtaining module is used for obtaining a to-be-defrosted component; and the control module is used for controlling and adjusting the working state of the outdoor unit according to the to-be-defrosted component. According to the invention, the refrigerant is prevented from directly entering the indoor space, and effective and rapid defrosting can be ensured, so that the heat exchange efficiency is improved.

The invention provides a fusion thermal management control system and method for a pure electric heavy truck, and belongs to the technical field of new energy vehicles. The system comprises a heat management controller, a cooling fan, a motor cooling system, a battery heat management system and a vehicle refrigerating system. The motor cooling system and the battery thermal management system are connected through a four-way valve; when the four-way valve is closed, the motor cooling system and the battery heat management system are two relatively independent loops, and when the four-way valve is opened, the motor cooling system and the battery heat management system are integrated into a large loop; and the cooling fan is used for refrigerating the condenser and the radiator. By additionally arranging the four-way valve, the compressor is not started to refrigerate the battery under the low-load working condition, frequent starting and stopping of the compressor are avoided, and energy consumption of the whole system is reduced.

A thermal management system and method, a computer device, a vehicle and a storage medium. A four-way valve (17) can regulate the connection relationship between an electric drive circuit and a battery circuit, and a three-way valve can regulate the connection relationship between a heating apparatus, a heating circuit and the battery circuit. Therefore, said system can meet the requirement of the heating circuit selectively heating a passenger compartment and a battery (31) and the requirement of the electric drive circuit using electric drive waste heat to selectively heat the battery and the passenger compartment; and for some scenarios of vehicle use at year-round high temperatures, no heat pump system is required, thus making designed valve parts and system piping simpler, reducing the cost and resource waste of the thermal management system, and lowering the complexity of piping control.

The invention discloses a composite evaporative cooling type heat pump unit which comprises an air cooling fan and an evaporative air cooler which are located at the top of the unit, functional areas of a box body of the unit are distinguished through double-layer grids, the grid on the left side corresponds to an air inlet, the grid in the middle covers filler for evaporative cooling, and a water tank for collecting spray water is arranged at the bottom. A cooling water pump for pushing water circulation is arranged on the side of the water tank; the unit is provided with an evaporative heat exchanger, an air-cooled heat exchanger, a shell and tube evaporator, a compressor, a gas-liquid separator and an oil separator, the evaporative heat exchanger is connected with the air-cooled heat exchanger through a liquid pipe, each template is provided with an independent cut-off ball valve, and a main loop is directly connected with a four-way valve and an electromagnetic valve automatic switching loop; an EVD data collector is arranged at an outlet of the shell and tube evaporator and is directly connected with the four-way valve, and an electromagnetic valve automatic switching loop is connected to an inlet through a copper pipe; the compressor and the four-way valve are adjacently arranged on the lower side of the box body, one end of the gas-liquid separator is connected with an exhaust port of the compressor through a steel pipe, and the other end is connected with the four-way valve; one end of the oil separator is connected with an exhaust port of the compressor through a steel pipe, and the other end is connected with the four-way valve. The problem that an evaporative heat pump unit in a low-temperature environment area in winter is unstable in heating effect is solved, meanwhile, the refrigerating efficiency is higher than that of an air-cooled heat pump, system operation is stable, and energy conservation and emission reduction are achieved.

The utility model discloses a four-way valve assembly, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The four-way valve assembly comprises a four-way valve body and a first pressure detection device, the four-way valve body comprises a main valve pipe and a first pipe joint connected to the main valve pipe, and a one-way valve is arranged at the end, away from the main valve pipe, of the first pipe joint; the first pressure detection device is directly installed on the first pipe joint and communicated with the first pipe joint, and the first pressure detection device is used for detecting pressure information in the first pipe joint. The first pressure detection device is directly installed on the first pipe connector, a middle pipeline connecting the first pressure detection device and the first pipe connector is omitted, meanwhile, the one-way valve is integrated on the first pipe connector, a middle pipeline connecting the one-way valve and the first pipe connector is omitted, and therefore the machine body structure can be simplified to a certain degree, and the cost is reduced. The overall size of the machine body is reduced, and certain production and manufacturing cost can be reduced.

The application discloses an air conditioner and a control method of the air conditioner. The air conditioner comprises: a heat exchange flow path for realizing heat exchange between a domestic water tank and a refrigerant circulation flow path; a control valve group arranged on the refrigerant circulation flow path and used for conducting or cutting off the refrigerant circulation flow path; and a controller connected with the control valve group and a four-way valve. The controller is configured to: acquire a target operation mode of the air conditioner, wherein the target operation mode at least comprises a heating mode, a cooling mode and a cooperative mode in which the heating mode, the cooling mode and a hot water mode are combined; determine that the target operation mode of the air conditioner is the cooperative mode; and control the opening and closing states of the control valve group and the four-way valve according to the cooperative mode, so as to control the operation of the heat exchanger group and adjust the water tank temperature of the domestic water tank. The air conditioner can meet the cooling, heating and hot water demands of users at the same time, and the waste heat generated during the refrigeration or heating is fully utilized to prepare hot water, thereby avoiding energy waste of the air conditioner during the operation.

The invention discloses a thermal management integrated assembly and whole vehicle thermal management equipment, belongs to the technical field of thermal management systems, and is designed for solving the problems that an existing thermal management system is complex in connecting pipeline structure, large in occupied space and the like. The heat management integrated assembly comprises an integrated refrigerant waterway valve plate assembly, one port of a three-way valve is connected to a water outlet connector of a heat dissipation water tank, the other port of the three-way valve is connected to a water outlet connector of a motor, and another port of the three-way valve is connected to a port A of a first four-way valve; the three-way valve, the first four-way valve, the second four-way valve and connecting pipelines between the connectors are all integrated in the integrated refrigerant waterway valve plate assembly. A battery heat exchanger; and a low-temperature heat dissipation water tank. According to the heat management integrated assembly and the whole vehicle heat management equipment, pipelines in a unit are very few, the problem that an existing heat management system is complex in connecting pipeline structure and large in occupied space is solved, the size is compact, and installation and maintenance are convenient and fast.

The rotary four-way arbitrary intercommunication valve comprises a valve body and a valve element, and the valve element extends into the valve body and is in running fit with the valve body. And the valve core is used for switching the communication between any adjacent ports and the communication between the opposite ports every time the valve core rotates by 45 degrees in the valve body through the layered flow channel structure between 0 degree and 180 degrees. The four-way valve is composed of the valve body and the valve element, switching of any two-to-two communication among the four ports is flexibly controlled by rotating the angle of the valve element, mutual communication of the ports with specific flow direction combinations is supported, the function of dynamic random communication of the four ports is achieved, the sealing performance between the valve body and the valve element is improved, and the sealing performance of the valve body and the valve element is improved. The overall structural design is compact and simple, the characteristics of layered flow channels and high sealing performance are achieved, and the leakage rate is greatly reduced. The invention further discloses a rotating method for rotating the four-way arbitrary intercommunication valve.

The utility model discloses a four-way valve assembly, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The four-way valve assembly comprises a valve body and a first temperature detection device, the valve body comprises a main valve pipe and a first pipe joint and a second pipe joint which are connected to the main valve pipe, one of the first pipe joint and the second pipe joint is used for communicating with an exhaust port of the compressor, and the other one of the first pipe joint and the second pipe joint is used for communicating with an air return port of the compressor; the first temperature detection device is installed on the first pipe joint and used for detecting the temperature of the first pipe joint. The first temperature detection device is directly installed on the first pipe connector, a middle pipeline between the first temperature detection device and the first pipe connector is omitted, and therefore the machine body structure of the outdoor unit of the heating and ventilation equipment can be simplified to a certain degree, the overall size of the machine body can be reduced, and certain production and manufacturing cost can also be reduced. In addition, the first temperature detection device can directly detect the temperature of the first pipe joint, the detection is more visual, and the accuracy is higher.

The utility model discloses a heat recovery heat pump system which comprises a compressor, a heat recovery heat exchanger, a high-pressure gas-liquid separator, an outdoor heat exchanger, at least one indoor unit, a four-way valve, a first switch valve and a reversing valve. The heat recovery heat exchanger comprises a first refrigerant inlet and a first refrigerant outlet. The high-pressure gas-liquid separator comprises a second refrigerant inlet, a second refrigerant outlet used for outputting the gaseous refrigerant after gas-liquid separation and a third refrigerant outlet used for outputting the gaseous refrigerant after gas-liquid separation. The heat recovery heat pump system has a refrigeration and total heat recovery domestic hot water making mode and a refrigeration and partial heat recovery domestic hot water making mode, and the reversing valve keeps a second refrigerant outlet of the high-pressure gas-liquid separator to be communicated with the four-way valve in the two modes, so that the reversing valve does not need to be operated during mode switching, only the four-way valve needs to be operated, and the mode switching efficiency is improved. And the automatic flow direction of the refrigerant during mode switching can be realized by utilizing gas-liquid separation of the high-pressure gas-liquid separator, so that the stability of the system is improved.

The utility model discloses a four-way valve, a heating and ventilation equipment outdoor unit and heating and ventilation equipment, and relates to the technical field of heating and ventilation equipment. The four-way valve comprises a valve body, a first pipe connector and a second pipe connector, the first pipe connector comprises a main pipe section and a one-way valve pipe section which are communicated, the main pipe section is located between the valve body and the one-way valve pipe section and connected and communicated with the valve body, and an air inlet is formed in the end, away from the main pipe section, of the one-way valve pipe section and used for being connected with an exhaust port of the compressor. A valve element is arranged in the one-way valve pipe section and used for opening and closing communication between the air inlet and the main pipe section. One end of the second pipe joint is connected and communicated with the valve body, and the other end is connected with an air return port of the compressor. The one-way valve is directly integrated on the first pipe joint, and a middle structure for connecting the one-way valve and the four-way valve body is omitted, so that the structure of a machine body can be simplified to a certain extent, the overall size of the machine body is reduced, and certain production and manufacturing cost can be reduced.

The present invention relates to the technical field of electric vehicle thermal management, and particularly relates to a secondary loop thermal management system and an electric vehicle, which include a refrigerant loop, a passenger compartment water loop, a battery water loop, and a motor water loop. The refrigerant loop includes a water-cooled evaporator and a water-cooled condenser; the passenger compartment water loop includes a first four-way valve and a second four-way valve. The first interface of the first four-way valve is connected to the first end of the water-cooled evaporator, and its second interface is connected to the third end of the water-cooled condenser. The first interface of the second four-way valve is connected to the fourth end of the water-cooled condenser, and its second interface is connected to the second end of the water-cooled evaporator; the battery water loop is respectively connected to the fourth interface of the first four-way valve and the third interface of the second four-way valve; the motor water loop is respectively connected to the third interface of the first four-way valve and the fourth interface of the second four-way valve; the structure of the present invention is simply designed, with low cost, diverse thermal management modes, and the heat exchange efficiency is guaranteed.