Refrigerating unit device for new energy electric refrigerator car with integrated outdoor unit

Abstract

The utility model provides a refrigerating unit device for a new energy electric refrigerator car with an integrated outdoor unit, which belongs to the technical field of refrigerator car refrigeration and comprises a refrigerating unit and a defrosting unit, and the refrigerating unit comprises an outdoor unit assembly, an indoor unit assembly, a pipe group, a refrigerating and heat-insulating carriage and a high-voltage power battery. According to the refrigerating unit of the new energy refrigerator car, the used compressor is the electric compressor, the high-voltage power supply with the same voltage platform as the new energy refrigerator car body is used as a power source of the electric compressor, and the electric compressor is driven to replace a fuel oil belt wheel compressor; and an oil-gas separator, a condenser, a receiver-drier, a thermostatic expansion valve and an evaporator are sequentially arranged on the pipe group between the circulating refrigerant outlet and the circulating refrigerant inlet of the electric compressor. The fuel oil refrigerator car refrigerating unit can solve the problem that a power source is generated due to the fact that an existing traditional fuel oil refrigerator car refrigerating unit depends on work of an engine in the refrigerating process.

Description

Technical Field

[0001] The utility model belongs to the technical field of refrigeration of refrigerated trucks, and specifically is a refrigeration unit device for new energy electric refrigerated trucks with an integrated outdoor unit, which provides a refrigeration cold source for a heat-insulated compartment for fresh-keeping transportation. Background Art

[0002] A refrigerated truck refers to a closed van transport truck used to maintain the temperature of frozen or fresh goods. A refrigerated truck is a special refrigerated transport vehicle equipped with a refrigeration unit and an insulated compartment. It is commonly used to transport frozen foods (refrigerated trucks), dairy products (dairy transport trucks), vegetables and fruits (fresh goods transport trucks), vaccines and medicines (vaccine transport trucks), etc.

[0003] At present, the refrigerated trucks on the market are mainly traditional fuel truck refrigeration units, with the following main features:

[0004] The fuel refrigeration unit is driven by the engine pulley to generate thrust. The unit can only be started after the engine is started. The high engine speed corresponds to the high compressor speed. When the engine stops working, the compressor also stops working. It is completely dependent on the engine as a power source, that is, the engine needs to drive the pulley compressor to work. The engine itself consumes fuel to work, and a considerable amount of exhaust emissions are polluting the environment and affecting air quality to a certain extent. This is contrary to the energy conservation and emission reduction policies advocated by countries around the world. In terms of assembly, the refrigeration units currently used in refrigerated trucks on the market are mainly traditional fuel truck refrigeration units, which have the following problems:

[0005] 1) Traditional fuel vehicle refrigeration units use the engine's power to drive the compressor, which produces a considerable amount of exhaust emissions, polluting the environment and not in line with the development direction of green environmental protection;

[0006] 2) Traditional fuel vehicle refrigeration units use the engine's power to drive the compressor, which consumes a certain amount of engine shaft power. Under a certain power, the power available for vehicle driving becomes less, and fuel consumption increases;

[0007] 3) In traditional fuel vehicle refrigeration units, the engine drives the compressor, and the compressor speed changes with the engine speed. This speed change can cause unstable refrigeration temperature, resulting in temperature fluctuations.

[0008] 4) In traditional fuel-powered vehicle refrigeration units, the refrigerant pipes used to connect the refrigeration system must be connected to the compressor in the engine compartment. This long connecting pipe assembly increases the manufacturing cost of the refrigeration unit and increases the refrigerant flow resistance, thereby reducing refrigeration performance and energy efficiency.

[0009] 5) For the commonly used refrigeration units, when the amount of refrigerant in the refrigeration system is abnormal, the exhaust temperature will be too high or the suction temperature will be too low and liquid will be carried. If there is no protective device, it will lead to insufficient cooling capacity or damage to the seals of the compressor due to high temperature, or damage to the structural parts due to "liquid hammer" caused by low-temperature liquid refrigerant. Utility Model Content

[0010] In view of the above-mentioned deficiencies in the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit.

[0011] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0012] A refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit, the device includes a refrigeration unit and a defrost unit, each of which includes an outdoor unit assembly, an indoor unit assembly, an air conditioning connecting pipe group, a high-voltage power battery, a refrigerated and insulated compartment, and a drain pipe;

[0013] The outdoor unit assembly is installed outside the refrigerated and insulated compartment and is used to convert low-temperature and low-pressure gaseous refrigerant into medium-temperature and high-pressure supercooled liquid refrigerant or high-temperature and high-pressure gaseous refrigerant;

[0014] One end of the high-pressure hose assembly of the air-conditioning connecting pipe group is connected to the outdoor unit assembly, and the other end is connected to the indoor unit assembly, for transporting the medium-temperature and high-pressure supercooled liquid refrigerant to the indoor unit assembly;

[0015] The indoor unit assembly is installed inside the refrigerated and insulated compartment. In the cooling function, it is used to evaporate the medium-temperature and high-pressure supercooled liquid refrigerant and convert it into a low-temperature and low-pressure gaseous refrigerant, absorbing the heat of the surrounding air flowing through, so as to cool the air in the refrigerated and insulated compartment. In the defrosting function, it is used to release heat from the high-temperature and high-pressure gaseous refrigerant and convert it into a medium-temperature and low-temperature gaseous refrigerant, releasing heat to melt the frost attached to the outer tubes and fins of the evaporator of the indoor unit assembly. After the condensed water is converted into condensed water, it is discharged out of the refrigerated and insulated compartment through the drain pipe.

[0016] The high-voltage power battery is installed on the bottom of the refrigerated and insulated compartment body and is used to provide power for the outdoor unit assembly and the entire vehicle.

[0017] As a further improvement of the present invention: the indoor unit assembly includes an evaporator, an expansion valve, an indoor unit cover, an evaporating fan, an air inlet temperature sensor, a defrost temperature sensor and corresponding connected pipes.

[0018] As a further improvement of the present invention: the outdoor unit assembly is installed outside the refrigerated and insulated compartment and on top of the cab;

[0019] The outdoor unit assembly includes an oil-gas separator, a condenser, a liquid storage dryer, an electrical control box, an electric compressor, a condensing fan, a frame and an outdoor unit cover;

[0020] The electric compressor plays the role of compressing and driving the refrigerant in the refrigerant circuit of the refrigeration system. The electric compressor is used to extract the refrigerant from the low-pressure area and send it to the high-pressure area for cooling and condensation after compression;

[0021] The oil-gas separator is used to separate large oil droplets from the gaseous refrigerant compressed by the electric compressor;

[0022] The condenser is used to receive the high-temperature and high-pressure refrigerant gas sent by the electric compressor, flow in the internal closed flow channel, exchange heat with the air on the outer surface, and isobarically cool and condense into liquid under pressure, so that the high-temperature and high-pressure refrigerant gas can be liquefied without changing the saturation temperature and pressure;

[0023] The liquid storage dryer is used in the refrigeration system to store, dry and filter the liquid refrigerant to compensate for and adjust the profit and loss of the liquid refrigerant when the working conditions change. At the same time, it filters the debris and dirt in the flowing refrigerant and absorbs the moisture in the refrigerant.

[0024] The liquid storage dryer is integrated with a high-pressure switch. When the pressure in the refrigeration system pipeline is higher than the set value range, the high-pressure switch trips to change the on-off state of the control element and the refrigeration system stops working.

[0025] The electrical control box contains relays and fuses to control the on / off of electrical components and protect circuits from overcurrent.

[0026] The condensing fan is used to cool and condense the refrigerant in the flow channel of the condenser, so that the high-temperature and high-pressure refrigerant gas can be condensed and liquefied.

[0027] As a further improvement of the present invention: the oil-gas separator is connected to the condenser through a condenser air inlet pipe, and a group of defrost pipes are branched out from the condenser air inlet pipe, and the defrost pipes are refrigerant-connected air-conditioning pipes leading to the defrost solenoid valve.

[0028] As a further improvement of the present invention: a ventilation hole is provided on the front wall of the outdoor unit housing, and a refrigerant sight glass corresponding to the ventilation hole and capable of visual observation is provided inside the outdoor unit housing.

[0029] As a further improvement of the present invention: a high-pressure pressure switch is provided on one side of the liquid storage dryer. When the refrigerant pressure in the refrigeration system pipeline is higher than the set value range, the high-pressure pressure switch trips to change the on-off state of the control element, and the refrigeration system stops working.

[0030] As a further improvement of the present invention, the oil-gas separator is connected to the electric compressor via an oil return pipe, and the oil return pipe is used to introduce the lubricating oil separated from the oil-gas separator into the air intake device of the electric compressor;

[0031] The condenser outlet is connected to the liquid storage dryer via a first liquid outlet pipe;

[0032] The liquid storage dryer is connected to the high-pressure three-way stop valve with a valve core through a second liquid outlet pipe.

[0033] As a further improvement of the present invention: the outdoor unit assembly further includes a low-pressure three-way stop valve with a valve core and a high-pressure three-way stop valve with a valve core, wherein the low-pressure three-way stop valve with a valve core is a stop valve used at the low-pressure flow end of the refrigerant in the refrigeration system, and has two pipe connection ports, a piston valve port and a valve core port; the piston valve port can be screwed or loosened to change the connection and isolation state of the two pipe connection ports; the valve core port can be a transition interface between the low-pressure end of the refrigerant in the refrigeration system and the outside world, for filling the refrigerant or testing the refrigerant operating pressure of the system;

[0034] The high-pressure three-way stop valve with a valve core is a stop valve used at the high-pressure flow end of the refrigerant in the refrigeration system. It has two pipeline connection ports, a piston valve port and a valve core port; the piston valve port can be screwed or loosened to change the connection and isolation status of the two pipeline connection ports; the valve core port can be a transition interface between the high-pressure end of the refrigerant in the refrigeration system and the outside world, used to fill the refrigerant or test the refrigerant operating pressure of the system.

[0035] As a further improvement of the present invention, the air inlet of the electric compressor is connected to the air outlet of the low-pressure three-way stop valve with a valve core through an air inlet pipe of the compressor, and the air inlet of the low-pressure three-way stop valve with a valve core is connected to the air outlet of the evaporator of the indoor unit through a low-pressure hose assembly, so as to transport the gaseous refrigerant of the refrigeration system and provide it to the electric compressor for compression;

[0036] The compressor air inlet pipe is provided with a low-pressure filling interface and a low-pressure pressure switch. When the refrigerant pressure in the refrigeration system pipeline is lower than the set value range, the low-pressure pressure switch will trip to change the on-off state of the control element, and the refrigeration system will stop working; the low-pressure filling interface is a transition interface that connects the low-pressure end of the refrigerant in the refrigeration system with the outside world, and is used to fill the refrigerant or test the refrigerant operating pressure of the system.

[0037] As a further improvement of the present invention, the electric compressor and the oil-gas separator are further connected via a compressor exhaust pipe, and the compressor exhaust pipe is used to transport the high-temperature and high-pressure gaseous refrigerant compressed by the electric compressor to the condenser for cooling, heat exchange and condensation;

[0038] A high-pressure filling interface is provided on the compressor exhaust pipe. The high-pressure filling interface is a transition interface connecting the refrigerant high-pressure end of the refrigeration system with the outside world, and is used to fill the refrigerant or test the refrigerant operating pressure of the system.

[0039] As a further improvement of the present invention: the liquid outlet of the liquid storage dryer is connected to the liquid inlet of the high-pressure three-way stop valve with a valve core through a second liquid outlet pipe, which is used to transport the liquid refrigerant of the refrigeration system and provide the refrigeration medium to the evaporator of the outdoor unit assembly for evaporative cooling.

[0040] Compared with the prior art, the beneficial effects of the present invention are:

[0041] This integrated outdoor unit refrigeration unit for new energy electric refrigerated vehicles utilizes an electric compressor powered by a high-voltage power supply with the same voltage platform as the new energy refrigerated vehicle body, replacing the fuel-powered pulley compressor. The control system is powered by a low-voltage (DC12V / 24V) battery with the same voltage platform as the new energy refrigerated vehicle body. The pipe system between the refrigerant outlet and refrigerant inlet of the electric compressor is equipped with an oil-gas separator, condenser, receiver-drier, expansion valve, and evaporator. Compared to traditional fuel-powered refrigerated vehicle refrigeration units, this unit is purely electric-driven, has no exhaust emissions, and is environmentally friendly, with zero air pollution, complying with national environmental protection policies. This utility model addresses the problem of existing fuel-powered refrigerated vehicle refrigeration units relying on the engine for power.

[0042] The electric compressor can be placed on the outdoor unit assembly frame of the refrigeration unit. The refrigerant air-conditioning pipe used for connection no longer needs to be connected from the engine compartment. The length of the air-conditioning pipe can be greatly shortened, saving pipe costs.

[0043] In addition to the conventional high- and low-pressure charging ports, this device is also equipped with two sets of three-way stop valves with valve pins (one high-pressure valve and one low-pressure valve). During factory inspection and testing, after the required amount of refrigerant (refrigerant) is charged into the refrigeration system, the refrigeration system is operated. The piston valve port of the high-pressure three-way stop valve with valve core is first locked. After 2-3 minutes, the piston valve port of the low-pressure three-way stop valve with valve core is tightened. In this way, all the refrigerant (refrigerant) is locked in the outdoor unit condenser-drying liquid storage-compressor-internal connecting pipe. The outdoor unit assembly can now internally store the required amount of refrigerant for the refrigeration system. During vehicle installation, the connecting pipes are connected to form the refrigeration system and vacuumed to confirm that the system is leak-free. Then, the piston valve ports of the two sets of three-way stop valves with valve pins are loosened to release the rated amount of refrigerant (refrigerant) stored in the outdoor unit. There is no need to bring refrigerant bottles for refrigerant filling on site, which improves the convenience of charging.

[0044] The sight glass faces forward, and there is a ventilation hole just in front of the outdoor unit cover. The spacing of the ventilation holes is suitable as an observation hole, which can be used as both a frontal wind hole and a refrigerant observation hole. When the refrigeration unit is running, you can observe whether the refrigerant status is sufficient. Without opening the outdoor unit cover, you can observe the refrigerant flowing through the condenser outlet on the pipeline or the dry liquid storage tank, and you can judge whether the refrigerant is sufficient more intuitively.

[0045] The surface of the exhaust pipe and intake pipe metal tube connected to the electric compressor is equipped with a normally closed high-temperature and low-temperature protection switch. When the refrigerant is overheated or too low to the set value due to insufficient or excessive refrigerant, the control circuit of the compressor can be cut off, the refrigeration system or defrost system can be stopped, and the compressor can be protected from damage to components caused by excessive temperature or low temperature of the refrigeration system due to abnormal refrigerant in the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 This is a schematic structural diagram of the outdoor unit assembly of the present utility model;

[0047] Figure 2 This is a schematic diagram of the structure of the internal components of the outdoor unit assembly in the present utility model;

[0048] Figure 3 This is a working schematic diagram of the utility model;

[0049] Figure 4 This is a schematic diagram of the refrigerant flow for refrigeration and defrosting in the utility model;

[0050] Figure 4A This is a schematic diagram of the indoor unit assembly structure of the utility model;

[0051] Figure 5 This is a schematic diagram of the loading of the utility model;

[0052] Figure 6 This is the electrical schematic diagram of the utility model. DETAILED DESCRIPTION

[0053] The technical solution of this patent is further described in detail below in conjunction with specific implementation methods.

[0054] The following describes in detail embodiments of the present invention, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0055] See also Figure 1-6 , the present embodiment provides a refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit, the device includes a refrigeration unit and a defrost unit, the refrigeration unit and the defrost unit both include an outdoor unit assembly 10, a drain pipe 20, an indoor unit assembly 30, an air-conditioning connecting pipe group 40, a refrigerated and insulated compartment 50, and a high-voltage power battery 100, the outdoor unit assembly 10 is installed outside the refrigerated and insulated compartment 50 and on the top of the cab, and is used to convert a low-temperature and low-pressure gaseous refrigerant into a medium-temperature and high-pressure supercooled liquid refrigerant or a high-temperature and high-pressure gaseous refrigerant, one end of the air-conditioning connecting pipe group 40 is connected to the outdoor unit assembly 10, and the other end is connected to the indoor unit assembly 30, and is used to transport the medium-temperature and high-pressure supercooled liquid refrigerant or the high-temperature and high-pressure gaseous refrigerant to the indoor unit assembly 30, and the indoor unit assembly 30 is installed inside the refrigerated and insulated compartment 50, and is used to convert the medium-temperature and high-pressure supercooled liquid refrigerant into a medium-temperature and high-pressure gaseous refrigerant. The medium-temperature and high-pressure supercooled liquid refrigerant or high-temperature and high-pressure gaseous refrigerant is converted into a low-temperature and low-pressure gaseous refrigerant or maintained in a high-temperature and high-pressure gaseous refrigerant state to cool or defrost the refrigerated and insulated compartment 50. In the refrigeration function, the indoor unit assembly 30 is used to evaporate the medium-temperature and high-pressure supercooled liquid refrigerant and convert it into a low-temperature and low-pressure gaseous refrigerant, absorbing the heat of the surrounding air flowing through to cool the air in the refrigerated and insulated compartment 50; in the defrost function, the indoor unit assembly 30 is used to release heat from the high-temperature and high-pressure gaseous refrigerant and convert it into a medium- and low-temperature gaseous refrigerant, releasing heat to melt the frost attached to the outer tubes and fins of the evaporator 301 of the indoor unit assembly 30, and after it becomes condensed water, it is discharged out of the refrigerated and insulated compartment 50 through the drain pipe 20. The high-voltage power battery 100 is installed under the refrigerated and insulated compartment 50 and attached to the frame, and is used to provide power for the outdoor unit assembly 10 and the entire vehicle.

[0056] See also Figure 4AIn one embodiment, the indoor unit assembly 30 includes an evaporator 301, an indoor unit housing 302, an expansion valve 303, an evaporating fan 304, an inlet air temperature sensor 305, a defrost temperature sensor 306, and corresponding connected pipes.

[0057] The indoor unit housing 302 is used for the evaporator 301, the expansion valve 303, the evaporating fan 304, the air inlet temperature sensor 305 and the defrost temperature sensor 306, and provides installation and fixing, ventilation, condensation water collection and discharge functions.

[0058] The evaporator fan 304 rotates its blades to blow air in the vehicle cabin through the outer tubes and fins of the evaporator 301 during cooling and defrosting. The air exchanges cold or heat with the outer tubes and fins of the evaporator 301, thereby cooling the vehicle cabin air or melting the frost on the outer tubes and fins of the evaporator 301 into condensed water.

[0059] The air inlet temperature sensor 305 is installed at the air inlet of the evaporating fan 304 and is mainly used to sense and monitor the air temperature in the air flow entering the evaporating fan 304 (i.e., the air temperature in the vehicle compartment). The sensed data is transmitted to the refrigeration unit control panel 60 for data function processing to determine the temperature state of the air in the vehicle compartment.

[0060] The defrost temperature sensor 306 is mounted on the outer tubes and fins of the evaporator 301 and is primarily used to sense and monitor the external temperature of the evaporator 301 (i.e., the evaporator's external surface temperature). The sensed data is transmitted to the refrigeration unit control panel 60 for data processing to determine the external temperature of the evaporator 301 and, therefore, the degree of defrosting progress.

[0061] See also Figure 2 、 Figure 4 、 Figure 4A and Figure 5In one embodiment, the outdoor unit assembly 10 is installed outside the refrigerated and insulated compartment 50 and on the top of the cab. The outdoor unit assembly 10 includes an oil-gas separator 101, a condenser 106, a liquid storage dryer 109, an electrical control box 119, an electric compressor 121, and a condensing fan 124. The electric compressor 121 plays the role of compressing and driving the refrigerant in the refrigerant circuit of the refrigeration system. The electric compressor 121 is used to extract the refrigerant from the low-pressure area, compress it and send it to the high-pressure area for discharge. After the oil droplets are separated by the oil-gas separator 101, the air is blown to the condensing fan 124. The heat sink of the condenser 106 emits heat into the air, and the refrigerant condenses from gas to liquid. After the liquid refrigerant is dried and filtered by the liquid storage dryer 109, the refrigerant flows from the high-pressure area to the low-pressure area of ​​the indoor unit assembly 30. After throttling and pressure reduction by the expansion valve 303, it is sprayed into the evaporator 301. The pressure drops suddenly, and the liquid refrigerant immediately turns into gas, and absorbs a large amount of heat in the air through the heat sink of the evaporator 301. In this way, the electric compressor 121 keeps working, and continuously absorbs the heat at one end of the low-pressure area into the refrigerant and then sends it to the high-pressure area to be dissipated into the air, thereby regulating the temperature.

[0062] The compressor driven by a pulley as a power source is called a pulley compressor, and the compressor driven by an electric motor with an electric power source is called an electric compressor; the oil-gas separator 101 is used to separate the large oil droplets in the gaseous refrigerant compressed by the electric compressor 121. Under the action of air pressure, the large oil droplets flow back to the electric compressor 121 through the oil return pipe 112 to serve as a lubricant for the moving parts of the compressor; while the small oil droplets are mixed in the refrigerant and flow back to the compressor along with the refrigerant flow through the pipe group for the flow of refrigerant to serve as a lubricant for the moving parts of the compressor; the condenser 106 is used to receive the high-temperature and high-pressure refrigerant gas sent by the electric compressor 121, flow in the inner closed flow channel, exchange heat with the air blown by the condensing fan 124 on the outer surface, and isobarically cooled and condensed into liquid under pressure, so that the high-temperature and high-pressure refrigerant gas can be liquefied under the condition of unchanged saturated pressure and temperature, thereby playing a cooling role. The condensed refrigerant liquid passes through the expansion valve 303 Or other throttling elements enter the evaporator and enter the evaporation link; the liquid storage dryer 109 is used for storage, drying and filtering of liquid refrigerant in the refrigeration system to compensate and adjust the profit and loss of liquid refrigerant when the working conditions change, and at the same time filter out debris and dirt in the flowing refrigerant and absorb moisture in the refrigerant. The liquid storage dryer 109 is integrated with a high-pressure pressure switch. When the refrigerant pressure in the refrigeration system pipeline is higher than the set value range, the high-pressure pressure switch trips to change the on-off state of the control element, and the refrigeration system stops working to ensure the smooth circulation of the refrigerant to avoid safety accidents or component failures caused by excessive system pressure; electrical control actuators such as relays and fuses are centrally placed inside the electrical control box 119; the condensing fan 124 uses a fan to force air to flow through the surface of the condenser 106, so that the condenser 106 dissipates heat, cools and condenses the refrigerant in the flow channel of the condenser 106, and allows the refrigerant to be liquefied.

[0063] The outdoor unit assembly 10 and the indoor unit assembly 30 included in the defrost unit are connected by a defrost hose assembly 403 in the air conditioning connecting pipe group 40, and are controlled to be opened and closed by a defrost solenoid valve 105.

[0064] After the outdoor unit assembly 30 receives the defrost operation instruction, the defrost solenoid valve 105 is turned on and the valve is opened. The electric compressor 121 operates under the power supply of the high-voltage power battery 100, compressing the low-temperature and low-pressure gaseous refrigerant into a high-temperature and high-pressure gaseous refrigerant, which enters the defrost hose assembly 403 of the air conditioning connecting pipe group 40;

[0065] One end of the defrost hose assembly 403 is connected to the outdoor unit assembly 10, and the other end is connected to the defrost pipe group interface of the indoor unit assembly 30, for transporting the high-temperature and high-pressure gaseous refrigerant to the indoor unit assembly 30;

[0066] The high-temperature and high-pressure gaseous refrigerant passes through the evaporator 301 of the indoor unit assembly 30, and transfers heat to the outer tubes and fins of the evaporator 301 through heat conduction, melting the frost attached to the outer tubes and fins of the evaporator 301, turning it into condensed water and peeling it off, and then discharged out of the refrigerated and insulated compartment 50 through the drain pipe.

[0067] After the indoor unit assembly 30 releases heat and absorbs the coldness of the frost, the high-temperature and high-pressure gaseous refrigerant becomes a medium-low temperature gaseous refrigerant, and returns to the low-pressure area of ​​the electric compressor 121 through the low-pressure hose assembly 402 in the air-conditioning connecting pipe group 40.

[0068] See also Figure 1 and Figure 5 In one embodiment, the outdoor unit cover 126 is fixedly connected to the outdoor unit frame 125 via a connector (bolt), and the outdoor unit frame 125 is fixedly connected to the refrigerated and heat-insulating compartment 50 via a connector (bolt).

[0069] See also Figure 2 and Figure 4 In one embodiment, the oil-gas separator 101 is connected to the condenser 106 through a condenser air inlet pipe 102. A group of defrost pipes 104 are branched out from the condenser air inlet pipe 102. The defrost pipe 104 is a refrigerant connection air conditioning pipe leading to a defrost solenoid valve 105. When defrosting is required, hot refrigerant is provided to the evaporator 301 to melt the frost on the outer tubes and fins of the evaporator. The defrost solenoid valve 105 is an automated basic component used to control the on and off of the refrigerant fluid, and cooperates with the circuit to achieve the expected valve core switch control.

[0070] See also Figure 1 and Figure 2 In one embodiment, a ventilation hole is provided on the front wall of the outdoor unit cover 126, and a sight glass 110 corresponding to the ventilation hole is provided inside the outdoor unit cover 126 for visual observation. Through the provision of the ventilation hole, on the one hand, heat dissipation of the internal components of the outdoor unit cover 126 can be achieved, and on the other hand, the sight glass 110 can be observed through the ventilation hole, and then the refrigerant condition of the liquid pipeline in the refrigeration system can be observed. According to the vapor-liquid state of the flowing refrigerant, it is more intuitive to judge whether the refrigerant amount is appropriate. For example: when the refrigeration system is working, the refrigerant flowing through the sight glass 110 contains many bubbles or flash gas, indicating that the refrigerant dosage is insufficient, and appropriate filling and replenishing of liquid can be considered. The sight glass 110 is mainly arranged in the liquid refrigerant flow direction pipe in the high-pressure section, and can also be integrated on the liquid storage dryer 109.

[0071] See also Figure 2In one embodiment, a high-pressure pressure switch 108 is provided on one side of the liquid storage dryer 109. When the refrigerant pressure in the refrigeration system pipeline exceeds the set value range (too high), the high-pressure pressure switch 108 is disconnected to change the on-off state of the control element and protect the refrigeration system from damage. When the pressure returns to the normal range, the high-pressure pressure switch 108 returns to the original set on-off state.

[0072] See also Figure 2 In one embodiment, the oil-gas separator 101 is connected to the electric compressor 121 via an oil return pipe 113. The oil return pipe 113 is used to introduce the lubricating oil separated from the oil-gas separator 101 into the intake device of the electric compressor 121. The oil return pipe 113 is generally made of a slender copper pipe with a relatively small inner diameter (generally φ1 to φ2 mm).

[0073] See also Figure 2 In one embodiment, the outlet of the condenser 106 is connected to the liquid storage dryer 109 via a first liquid outlet pipe 107 , and the refrigerant between the outlet of the condenser 106 and the liquid storage dryer 109 flows through the first liquid outlet pipe 107 .

[0074] The liquid storage dryer 109 is connected to the high-pressure three-way stop valve with valve core 114 through a second liquid outlet pipe 111 .

[0075] Please continue reading Figure 2In one embodiment, the outdoor unit assembly 10 further includes a low-pressure three-way stop valve 112 with a valve core and a high-pressure three-way stop valve 114 with a valve core, wherein the low-pressure three-way stop valve 112 with a valve core is a stop valve used at the low-pressure flow end of the refrigerant in the refrigeration system, and has two pipeline connection ports, a piston valve port and a valve core port, with a total of four mutually perpendicular interfaces. The piston valve port can be screwed or loosened to change the connection and isolation state of the two pipeline connection ports; the valve core port can be the refrigerant of the refrigeration system. The transition interface between the low-pressure end of the medium and the outside world is used to charge the refrigerant or test the refrigerant operating pressure of the system. Under normal circumstances, the piston valve port and the valve core port are blocked with nuts. When the valve stem of the piston valve moves down to the top, the two pipe connection ports are cut off, and the pipeline circuits of the indoor unit assembly 30 and the outdoor unit assembly 10 are disconnected; when the valve stem of the piston valve moves up, the two pipe connection ports are connected, and the outdoor unit assembly 10 is connected to the indoor unit assembly 30. When the air conditioner needs to be charged with refrigerant for maintenance, unscrew the valve core port nut and connect the low-pressure pipe joint nut of the fluorine filling meter. The nut, tightening is equivalent to pressing the valve pin, which can connect with the piping of the refrigeration system; the high-pressure three-way stop valve 114 with a valve core is a stop valve used at the high-pressure flow end of the refrigerant in the refrigeration system, and has two pipeline connection ports, a piston valve port and a valve core port, with a total of four mutually perpendicular interfaces. The piston valve port can be screwed or loosened to change the connection and isolation state of the two pipeline connection ports; the valve core port can be a transition interface between the high-pressure end of the refrigerant in the refrigeration system and the outside world, used to charge the refrigerant or test the system Refrigerant operating pressure. Under normal circumstances, the piston valve port and the valve core port are blocked with nuts. When the valve stem of the piston valve moves down to the top, the two pipe connection ports are cut off, and the pipeline circuits of the indoor unit assembly 30 and the outdoor unit assembly 10 are disconnected; when the valve stem of the piston valve moves up, the two pipe connection ports are connected, and the outdoor unit assembly 10 is connected to the indoor unit assembly 30. When the air conditioner needs to be charged with refrigerant for maintenance, unscrew the valve core port nut, connect the high-pressure pipe joint nut of the fluorine charging meter, and tighten it, which is equivalent to pressing the valve pin, so that it can be connected to the piping of the refrigeration system.

[0076] Please continue reading Figure 2 、 Figure 3 、 Figure 4 and Figure 5In one embodiment, the air inlet of the electric compressor 121 and the air outlet of the low-pressure three-way stop valve 112 with a valve core are connected to the air conditioning pipe through the compressor air inlet pipe 118. The air inlet of the low-pressure three-way stop valve 112 with a valve core is connected to the evaporator 301 of the indoor unit assembly 30 through the low-pressure hose assembly 40 in the air conditioning connecting pipe group 40 to transport the gaseous refrigerant of the refrigeration system and provide it to the electric compressor 121 for compression. The compressor air inlet pipe 118 is provided with a low-pressure filling interface 117 and a low-pressure pressure switch 115. When the refrigerant pressure in the refrigeration system pipeline exceeds the set pressure, the low-pressure filling interface 117 and the low-pressure pressure switch 115 are provided. When the pressure is within the set value range (too low), the low-pressure pressure switch 115 will trip to change the on-off state of the control element, and the refrigeration system will stop working, thereby protecting the refrigeration system from damage; when the pressure returns to the normal range, the low-pressure pressure switch 115 will return to the on-off state; the low-pressure filling interface 117 is a transition interface for connecting the low-pressure end of the refrigerant of the refrigeration system with the outside world, which is used to fill the refrigerant or test the refrigerant operating pressure of the system. It is generally manufactured according to national or industry standards and is used for specific brand refrigerant systems. This low-pressure filling interface is designed and manufactured for R134a refrigerant.

[0077] The compressor intake pipe 118 is also provided with a normally closed low-temperature protection switch 116. The normally closed low-temperature protection switch 116 is arranged on the surface of the metal tube of the compressor intake pipe 118 which is relatively close to the air intake port of the electric compressor 121. It is a normally closed type. It is disconnected when the sensing temperature reaches the set value, and returns to the closed state when the return temperature setting is reached, so as to prevent the electric compressor 121 from being sucked into the low-temperature liquid refrigerant and causing the structural parts to be damaged by liquid shock.

[0078] Please continue reading Figure 2 and Figure 3 In one embodiment, the electric compressor 121 and the oil-gas separator 101 are further connected via a compressor exhaust pipe 123. The compressor exhaust pipe 123 is used to transport the high-temperature and high-pressure gaseous refrigerant compressed by the electric compressor 121 to the condenser 106 for cooling, heat exchange and condensation. The compressor exhaust pipe 123 is provided with a high-pressure filling interface 120 and a normally closed high-temperature protection switch 122. The high-pressure filling interface 120 is a transition interface connecting the high-pressure end of the refrigerant in the refrigeration system with the outside world, and is used to fill refrigerant or test the refrigerant operating pressure of the system. It is generally manufactured according to national or industry standards and is applied to specific brand refrigerant systems. This low-pressure filling interface is designed and manufactured for R134a refrigerant. The normally closed high-temperature protection switch 122 is a temperature protection switch disposed on the outer surface of the metal tube of the compressor exhaust pipe 123 relatively close to the exhaust port of the electric compressor 121. It is a normally closed type. It opens when the sensing temperature reaches the set temperature value and returns to the closed state when the hysteresis temperature setting is reached, thereby preventing the electric compressor 121 from being damaged by high temperature and the sealing component.

[0079] See also Figure 4A and Figure 5 In one embodiment, the refrigeration unit further includes a drain pipe 20, a refrigeration unit control panel 60, a vehicle-mounted low-voltage battery 70, a control harness 80, and a high-voltage harness 90; the drain pipe 20 discharges condensed water from the evaporator 301 of the indoor unit 30 during cooling and defrosting; the refrigeration unit control panel 60 is a part of the human-machine communication interface, which is a panel for realizing various functions of the refrigeration unit, such as: power on and off, function selection key, temperature setting key, wind adjustment key, defrost key, parameter increase and decrease key, etc.; the vehicle-mounted low-voltage battery 70 is a low-voltage DC power storage device, which is used to transmit electrical energy to the vehicle body low-voltage electrical appliances and control system through the control harness 80; the high-voltage harness 90 is a harness for transmitting power energy, which is used to transmit the high voltage of the high-voltage power battery 100 to the electric compressor 121.

[0080] Please continue reading Figure 4A and Figure 5 In one embodiment, the air conditioning connecting pipe group 40 includes a high-pressure hose assembly 401, a low-pressure hose assembly 402, and a defrost hose assembly 403. The high-pressure hose assembly 401 is used to transport the medium-temperature and high-pressure supercooled liquid refrigerant to the indoor unit assembly 30. The air inside the refrigerated compartment 50 is evaporated through the evaporator 301 of the indoor unit assembly 30 to obtain refrigerated low-temperature air, and liquid condensed water is precipitated. The condensed water is discharged to the outside of the refrigerated compartment 50 through the drain pipe 20. The evaporated low-temperature and low-pressure gaseous refrigerant passes through the low-pressure hose assembly 402 connected to the evaporator 301 of the indoor unit assembly 30, passes through the low-pressure three-way stop valve 112 with a valve core, and passes through the compressor intake pipe 118 to return to the electric compressor 121.

[0081] See also Figure 2 、 Figure 4 、 Figure 4A and Figure 5In one embodiment, the refrigeration unit includes an outdoor unit assembly 10, a drain pipe 20, an indoor unit assembly 30, an air-conditioning connecting pipe group 40 and a refrigerated and insulated compartment 50. The electric compressor 121 extracts refrigerant from a low-pressure area, compresses it and sends it to a high-pressure area to become a high-temperature and high-pressure gaseous refrigerant, which is discharged to the oil-gas separator 101 through the compressor exhaust pipe 123. After oil and gas separation, the refrigerant is discharged to the defrost pipe 104 through the condenser air inlet pipe 102. When the defrost solenoid valve 105 is energized and opened, the high-temperature and high-pressure gaseous refrigerant is sent to the evaporator 301 through the defrost hose assembly 403 connected to the indoor unit assembly 30. Through heat conduction, the heat is transferred to the outer tubes and fins of the evaporator 301, melting the frost attached to the outer tubes and fins of the evaporator 301, turning it into condensed water and peeling it off, and then discharged out of the refrigerated and insulated compartment 50 through the drain pipe 20. After the high-temperature and high-pressure gaseous refrigerant releases heat and absorbs the coldness of frost in the indoor unit assembly 30, it becomes a medium-low temperature gaseous refrigerant, passes through the low-pressure hose assembly 402 connected to the evaporator 301 of the indoor unit assembly 30, passes through the low-pressure three-way stop valve 112 with a valve core, and returns to the electric compressor 121 through the compressor intake pipe 118.

[0082] This integrated outdoor unit for new energy electric refrigerated trucks uses a high-voltage power supply with the same voltage platform as the new energy refrigerated truck body as the power source for the electric compressor, driving the electric compressor to replace the fuel pulley compressor; the control system power supply uses a low-voltage power supply (DC12V / 24V) with the same voltage platform as the new energy refrigerated truck body. Compared with traditional fuel refrigerated truck refrigeration units, this is fully electric, has no tailpipe emissions, is green and environmentally friendly, and has no air emission pollution, complying with the environmental protection policy advocated by the country;

[0083] This integrated outdoor unit is a new energy electric refrigeration vehicle refrigeration unit. By replacing the fuel-driven pulley compressor with an electric compressor, the refrigeration function is achieved without relying on the power generated by the engine. The flow rate of the refrigerant (coolant) is not directly related to the start and stop of the engine and the high and low speed. The temperature control of the refrigerated compartment is relatively easy to achieve. The refrigeration source can be supplied stably and without fluctuations according to the needs of the refrigerated compartment. The cooling temperature has a good linearity and the refrigeration system is also easier to maintain.

[0084] This integrated outdoor unit of the new energy electric refrigerated truck refrigeration unit uses an electric compressor to drive the fuel pulley compressor instead. The electric compressor can be placed on the outdoor unit frame of the refrigeration unit. The refrigerant air conditioning pipe used for connection no longer needs to be connected from the engine compartment. The length of the air conditioning pipe can be greatly shortened, saving pipe costs, reducing refrigerant flow resistance, improving refrigeration performance, and increasing the refrigeration energy efficiency ratio.

[0085] This integrated outdoor unit is a new energy electric refrigeration vehicle refrigeration unit. The electric compressor is arranged on the outdoor unit frame of the refrigeration unit and integrated with the outdoor unit. It is connected to the terminal interface of the internal intake and exhaust high and low pressure connecting pipes and is equipped with two sets of three-way stop valves with valve pins (one set of high-pressure valves and one set of low-pressure valves). During the factory inspection and test, after the refrigerant (refrigerant) that needs to be filled with the rated amount is charged into the refrigeration system, the refrigeration system is operated, and the piston valve port of the high-pressure three-way stop valve with valve core is locked first. After 2 to 3 minutes, the piston valve port of the low-pressure three-way stop valve with valve core is locked again. Press the piston valve port of the three-way stop valve, so that all the refrigerant (coolant) is locked in the outdoor unit condenser-drying liquid storage-compressor-internal connecting pipeline. The outdoor unit assembly can store the rated amount of refrigerant required for the refrigeration system internally. When loading the vehicle, the connecting pipes form the refrigeration system and vacuum the system to confirm that there is no leakage. Then, loosen the piston valve ports of the two sets of three-way stop valves with valve pins to release the rated amount of refrigerant (coolant) stored in the outdoor unit. There is no need to bring refrigerant bottles to do refrigerant filling operations on site, which improves the convenience of filling work.

[0086] This integrated outdoor unit for new energy electric refrigerated vehicles features quick-fill connectors for R134a refrigerant high and low pressure pipes, and a three-way stop valve with a valve pin and an R12 screw-type filling connector. This allows both filling connectors to be used for vacuuming and refrigerant charging, improving the versatility of filling tools and instruments.

[0087] The refrigeration unit of the new energy electric refrigerated vehicle with this integrated outdoor unit is equipped with a refrigerant sight glass at the flow end of the high-pressure liquid outlet pipe. The sight glass faces forward, and ventilation holes are opened in front of the outdoor unit cover. The spacing of the ventilation holes is suitable as observation holes, which can be used as both windward ventilation holes and refrigerant observation holes. When the refrigeration unit is running, the refrigerant status can be observed to see whether it is sufficient. Without opening the outdoor unit cover, the refrigerant flowing through the condenser outlet on the pipeline or dry liquid storage tank can be observed, and whether the refrigerant is sufficient can be judged more intuitively.

[0088] This integrated outdoor unit for a new energy electric refrigerated vehicle refrigeration unit is equipped with a normally closed high-temperature protection switch on the metal tube surface of the exhaust pipe connected to the electric compressor. The switch is connected in series with the compressor's start-stop control circuit. The set temperature Ths of the high-temperature protection switch is determined by: taking the minimum charge of the calibrated refrigerant as X (g), and under the design maximum load condition, the corresponding temperature Th sensed on the metal tube surface of the compressor exhaust pipe is obtained by experiment, and adding an adjustment constant a, Ths = Th + a, which is the set temperature of the normally closed high-temperature protection switch. Ths < Ty (the thermal protection temperature of the electric compressor). If the refrigerant overheats due to insufficient refrigerant exceeds the set value, the compressor control circuit can be disconnected, stopping the compressor from operating. This facilitates inspection and maintenance of the refrigeration unit and prevents damage to the compressor.

[0089] This integrated outdoor unit, used in new energy electric refrigerated vehicles, features a normally closed low-temperature protection switch on the metal tube of the suction pipe connected to the electric compressor. This switch is connected in series with the compressor's start / stop control circuit. The setting temperature for the low-temperature protection switch is determined by experimentally sensing the corresponding temperature Tx on the metal tube surface of the compressor discharge pipe when the electric compressor's suction superheat, △Tx, is 0 (Note: Suction superheat = actual compressor suction temperature - the refrigerant saturation temperature at actual suction pressure). Adding an adjustment constant, b, yields the setting temperature for the normally closed low-temperature protection switch. Typically, Tx+b > 0, indicating the freezing point, or the economical temperature above 0°C. If components within the refrigeration system are damaged, resulting in incomplete evaporation of the refrigerant and liquid droplets entering the compressor suction pipe, causing the compressor suction temperature to drop too low, the switch disconnects the compressor's control circuit and stops operation when the sensed temperature reaches the set temperature. This facilitates inspection and maintenance of the refrigeration unit and prevents compressor damage from "liquid hammer."

[0090] The above describes in detail the preferred embodiments of this patent, but this patent is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in this field without departing from the purpose of this patent.

Claims

1. A refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit, comprising a refrigeration unit and a defrosting unit, characterized in that: The refrigeration unit and the defrost unit each include an outdoor unit assembly, an indoor unit assembly, an air conditioning connecting pipe group, a high-voltage power battery, a refrigerated and insulated compartment, and a drainage pipe; The outdoor unit assembly is installed outside the refrigerated and insulated compartment and is used to convert low-temperature and low-pressure gaseous refrigerant into medium-temperature and high-pressure supercooled liquid refrigerant or high-temperature and high-pressure gaseous refrigerant; One end of the high-pressure hose assembly of the air-conditioning connecting pipe group is connected to the outdoor unit assembly, and the other end is connected to the indoor unit assembly, for transporting the medium-temperature and high-pressure supercooled liquid refrigerant or the high-temperature and high-pressure gaseous refrigerant to the indoor unit assembly; The indoor unit assembly is installed inside the refrigerated and insulated compartment. In the cooling function, it is used to evaporate the medium-temperature and high-pressure supercooled liquid refrigerant and convert it into a low-temperature and low-pressure gaseous refrigerant, absorbing the heat of the surrounding air flowing through, so as to cool the air in the refrigerated and insulated compartment. In the defrosting function, it is used to release heat from the high-temperature and high-pressure gaseous refrigerant and convert it into a medium-temperature and low-temperature gaseous refrigerant, releasing heat to melt the frost attached to the outer tubes and fins of the evaporator of the indoor unit assembly. After the condensed water is converted into condensed water, it is discharged out of the refrigerated and insulated compartment through the drain pipe. The high-voltage power battery is installed at the bottom of the refrigerated and insulated compartment body and is used to provide power for the outdoor unit assembly and the entire vehicle.

2. A refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 1, characterized in that: The indoor unit assembly includes an evaporator, an expansion valve, an indoor unit cover, an evaporating fan, an inlet air temperature sensor, and a defrost temperature sensor; The indoor unit housing is used for the evaporator, expansion valve, evaporating fan, inlet air temperature sensor, and defrost temperature sensor, providing installation and fixing functions, ventilation and ventilation functions, and receiving and discharging condensed water. The evaporator fan rotates its blades to blow air through the outer tubes and fins of the evaporator during cooling and defrosting. The air in the vehicle cabin is cooled by exchanging cold or heat with the outer tubes and fins of the evaporator, or the frost adhering to the outer tubes and fins of the evaporator is melted and converted into condensed water and peeled off. The air inlet temperature sensor is installed at the air inlet of the evaporator fan and is used to sense and monitor the air temperature in the air flow entering the evaporator fan. The sensed data is transmitted to the refrigeration unit control panel for data function processing to determine the temperature status of the air in the vehicle compartment; The defrost temperature sensor is installed on the surface tubes and fins of the evaporator to sense and monitor the surface temperature of the evaporator. The sensed data is transmitted to the refrigeration unit control panel for data function processing to determine the temperature status of the evaporator surface and thus the degree of defrosting progress.

3. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 1, characterized in that: The outdoor unit assembly is installed outside the refrigerated and insulated compartment and on top of the cab; The outdoor unit assembly includes an oil-gas separator, a condenser, a liquid storage dryer, an electrical control box, an electric compressor, a condensing fan, a frame and an outdoor unit cover; The electric compressor plays the role of compressing and driving the refrigerant in the refrigerant circuit of the refrigeration system. The electric compressor is used to extract the refrigerant from the low-pressure area and send it to the high-pressure area for cooling and condensation after compression; The oil-gas separator is used to separate large oil droplets from the gaseous refrigerant compressed by the electric compressor; The condenser is used to receive the high-temperature and high-pressure refrigerant gas sent by the electric compressor, flow in the internal closed flow channel, exchange heat with the air on the outer surface, and isobarically cool and condense into liquid under pressure, so that the high-temperature and high-pressure refrigerant gas can be liquefied without changing the saturation temperature and pressure; The liquid storage dryer is used in the refrigeration system to store, dry and filter the liquid refrigerant to compensate for and adjust the profit and loss of the liquid refrigerant when the working conditions change. At the same time, it filters the debris and dirt in the flowing refrigerant and absorbs the moisture in the refrigerant. The liquid storage dryer is integrated with a high-pressure pressure switch. When the refrigerant pressure in the refrigeration system pipeline exceeds the set value range, the high-pressure pressure switch trips to change the on-off state of the control element, and the refrigeration system stops working. The electrical control box contains relays and fuses to control the on / off of electrical components and protect circuits from overcurrent. The condensing fan is used to cool and condense the refrigerant in the flow channel of the condenser, so that the high-temperature and high-pressure refrigerant gas can be condensed and liquefied; The frame provides the structural arrangement of the components of the outdoor unit assembly and the fixing of the components in the refrigerated and insulated compartment; The outdoor unit cover provides necessary protection for various components inside the outdoor unit assembly.

4. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 3 is characterized in that: The oil-gas separator is connected to the condenser through a condenser air inlet pipe. A group of defrost pipes are branched out from the condenser air inlet pipe. The defrost pipes are refrigerant-connected air-conditioning pipes leading to the defrost solenoid valve.

5. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 3 is characterized in that: A ventilation hole is provided on the front wall of the outdoor unit housing, and a refrigerant sight glass corresponding to the ventilation hole and capable of visual observation is provided inside the outdoor unit housing.

6. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 3, characterized in that: A high-pressure pressure switch is provided on one side of the liquid storage dryer. When the refrigerant pressure in the refrigeration system pipeline is higher than the set value range, the high-pressure pressure switch trips to change the on-off state of the control element and the refrigeration system stops working.

7. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 3, characterized in that: The oil-gas separator is connected to the electric compressor via an oil return pipe, and the oil return pipe is used to introduce the lubricating oil separated from the oil-gas separator into the air intake device of the electric compressor; The condenser outlet is connected to the liquid storage dryer via a first liquid outlet pipe.

8. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 3, characterized in that: The outdoor unit assembly further includes a low-pressure three-way stop valve with a valve core and a high-pressure three-way stop valve with a valve core, wherein the low-pressure three-way stop valve with a valve core is a stop valve used at the low-pressure flow end of the refrigerant in the refrigeration system, and has two pipe connection ports, a piston valve port and a valve core port; the piston valve port can be screwed or loosened to change the connection and isolation state of the two pipe connection ports; the valve core port can be a transition interface between the low-pressure end of the refrigerant in the refrigeration system and the outside world, for filling the refrigerant or testing the refrigerant operating pressure of the system; The high-pressure three-way stop valve with a valve core is a stop valve used at the high-pressure flow end of the refrigerant in the refrigeration system. It has two pipeline connection ports, a piston valve port and a valve core port; the piston valve port can be screwed or loosened to change the connection and isolation status of the two pipeline connection ports; the valve core port can be a transition interface between the high-pressure end of the refrigerant in the refrigeration system and the outside world, used to fill the refrigerant or test the refrigerant operating pressure of the system.

9. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 3, characterized in that: The air inlet of the electric compressor is connected to the air outlet of the low-pressure three-way stop valve with a valve core through a compressor air inlet pipe, and the air inlet of the low-pressure three-way stop valve with a valve core is connected to the air outlet of the evaporator of the indoor unit through a low-pressure hose assembly, so as to transport the gaseous refrigerant of the refrigeration system and provide it to the electric compressor for compression; The compressor air inlet pipe is provided with a low-pressure filling interface and a low-pressure pressure switch. When the refrigerant pressure in the refrigeration system pipeline is lower than the set value range, the low-pressure pressure switch will trip to change the on-off state of the control element, and the refrigeration system will stop working; the low-pressure filling interface is a transition interface that connects the low-pressure end of the refrigerant in the refrigeration system with the outside world, and is used to fill the refrigerant or test the refrigerant operating pressure of the system.

10. The refrigeration unit device for a new energy electric refrigerated vehicle with an integrated outdoor unit according to claim 8, characterized in that: The electric compressor and the oil-gas separator are also connected via a compressor exhaust pipe, which is used to transport the high-temperature and high-pressure gaseous refrigerant compressed by the electric compressor to the condenser for cooling, heat exchange and condensation; The compressor exhaust pipe is provided with a high-pressure filling interface, which is a transition interface between the high-pressure end of the refrigerant in the refrigeration system and the outside world, and is used to fill the refrigerant or test the refrigerant operating pressure of the system; The electric compressor and the oil-gas separator are connected via a compressor exhaust pipe, and the compressor exhaust pipe is equipped with a normally closed high-temperature protection switch to prevent the electric compressor from being damaged by high temperature. The electric compressor and the low-pressure three-way stop valve with a valve core are also connected through a compressor intake pipe. The compressor intake pipe is equipped with a normally closed low-temperature protection switch to prevent the electric compressor from being sucked into the low-temperature liquid refrigerant, causing "liquid hammer" and damage to the structural parts.

Images