Refrigerating unit and refrigerator car

Abstract

The utility model discloses a refrigerating unit and a refrigerator car, the refrigerating unit comprises a condenser, a liquid storage device, a drying filter and a liquid viewing mirror, the condenser is provided with a refrigerant inlet and a refrigerant outlet, and a refrigerant flows in and out of the condenser through the refrigerant inlet and the refrigerant outlet; the liquid storage device is installed on the condenser and provided with a liquid storage cavity, a cavity inlet and a cavity outlet. The chamber inlet communicates with the condenser and the liquid storage chamber, so that a refrigerant for superheat exchange in the condenser is input into the liquid storage chamber through the chamber inlet; the cavity outlet communicates with the liquid storage cavity and the condenser, so that a refrigerant in the liquid storage cavity is input into the condenser through the cavity outlet; the drying filter is mounted in the liquid storage chamber to filter and dry at least part of the refrigerant flowing through the liquid storage chamber; the liquid viewing mirror is installed on the side wall of the liquid storage device and communicates with the liquid storage cavity. According to the application, pipeline connecting points are reduced, so that the risk of refrigerant leakage among the condenser, the liquid storage device, the drying filter and the liquid viewing mirror can be reduced.

Description

Technical Field

[0001] The present application relates to the field of heat exchange technology, and in particular to a refrigeration unit. The present application also relates to a refrigerated truck comprising the refrigeration unit. Background Art

[0002] In the existing system, some refrigeration units are provided with a condenser, a liquid storage tank, a drying filter, and a liquid sight glass, but the above-mentioned components are separately arranged, so that the above-mentioned components need to be connected through pipelines.

[0003] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art:

[0004] The condenser, liquid receiver, filter drier and sight glass on the refrigeration unit are connected by pipes. There are many pipe connection points in the middle, which increases the risk of refrigerant leakage.

[0005] Therefore, how to reduce the risk of refrigerant leakage between the condenser, liquid receiver, filter drier and sight glass of the refrigeration unit is a technical problem that needs to be solved urgently by those skilled in the art. Utility Model Content

[0006] The purpose of the present application is to provide a refrigeration unit that can reduce the risk of refrigerant leakage between the condenser, the liquid storage tank, the filter drier and the sight glass. Another purpose of the present application is to provide a refrigerated vehicle including the refrigeration unit.

[0007] In order to achieve the above objectives, this application provides the following technical solutions:

[0008] In a first aspect, the present application provides a refrigeration unit, comprising:

[0009] A condenser, provided with a refrigerant inlet and a refrigerant outlet for allowing the refrigerant to flow into and out of the condenser;

[0010] a liquid storage device installed on the condenser, the liquid storage device being provided with a liquid storage chamber, a chamber inlet and a chamber outlet; the chamber inlet being communicated with the condenser and the liquid storage chamber respectively, so that the refrigerant subjected to heat exchange in the condenser is input into the liquid storage chamber through the chamber inlet; the chamber outlet being communicated with the liquid storage chamber and the condenser respectively, so that the refrigerant in the liquid storage chamber is input into the condenser through the chamber outlet;

[0011] a drying filter installed in the liquid storage chamber to filter and dry at least a portion of the refrigerant flowing through the liquid storage chamber;

[0012] A sight glass is installed on the side wall of the liquid reservoir, and the sight glass is communicated with the liquid storage chamber.

[0013] In one possible design, the condenser includes:

[0014] A first header, wherein a first partition is provided therein, wherein the first partition divides the first header into a first pipe section and a second pipe section, wherein the first pipe section is provided with the refrigerant inlet, and the second pipe section is provided with the refrigerant outlet;

[0015] A second header having a second partition plate therein, wherein the second partition plate divides the second header into a third pipe section and a fourth pipe section;

[0016] A heat exchange body, one end of which is respectively connected to the first pipe segment and the second pipe segment, and the other end of which is respectively connected to the third pipe segment and the fourth pipe segment;

[0017] Wherein: the liquid storage device is installed on the second manifold, and the chamber inlet is communicated with the third pipe section, and the chamber outlet is communicated with the fourth pipe section.

[0018] In one possible design,

[0019] The heat exchange body comprises:

[0020] Flat tubes, the first tube section is connected to the third tube section through at least one of the flat tubes, and the second tube section is connected to the fourth tube section through at least one of the flat tubes;

[0021] Fins are provided between adjacent flat tubes.

[0022] In a possible design, the inner wall of the flat tube is provided with a capillary structure and / or a microchannel groove; and / or

[0023] The fins are streamlined, arc-shaped or S-shaped.

[0024] In a possible design, projected along a vertical plane, the top of the projection of the sight glass is not higher than the top of the projection of the dry filter, the bottom of the projection of the sight glass is not lower than the bottom of the projection of the dry filter, the top of the projection of the chamber outlet is lower than the top of the projection of the dry filter, and the bottom of the projection of the chamber outlet is higher than the bottom of the projection of the dry filter.

[0025] In a possible design, the drying filter includes a filter screen and a desiccant contained in the filter screen;

[0026] The drying filter is detachably connected to the liquid reservoir.

[0027] In one possible design, it also includes:

[0028] A compressor, wherein an exhaust port of the compressor is in communication with the refrigerant inlet;

[0029] a first expansion valve, wherein a first end of the first expansion valve is in communication with the refrigerant outlet;

[0030] an evaporator, wherein a first end of the evaporator is communicated with a second end of the first expansion valve, and a second end of the evaporator is communicated with a suction port of the compressor;

[0031] In the cooling mode, the refrigerant flows through the compressor, the condenser, the first expansion valve and the evaporator in sequence, and then flows back to the compressor.

[0032] In a possible design, a three-way valve is further included, wherein the three-way valve is provided with an inlet, a first outlet, and a second outlet, wherein the inlet is communicated with the exhaust port, the first outlet is communicated with the refrigerant inlet, and the second outlet is communicated with the first end of the evaporator;

[0033] In the cooling mode, the three-way valve is operated so that the inlet is connected to the first outlet and the inlet is blocked from the second outlet;

[0034] In the heating mode, the three-way valve is operated so that the inlet is connected to the second outlet and the inlet is blocked from the first outlet.

[0035] In a possible design, it also includes a plate heat exchanger and a second expansion valve, the plate heat exchanger includes a first heat exchange channel and a second heat exchange channel, heat exchange can be performed between the first heat exchange channel and the second heat exchange channel, the two ends of the first heat exchange channel are respectively connected to the refrigerant outlet and the first end of the first expansion valve, the two ends of the second heat exchange channel are respectively connected to the enthalpy increase port of the compressor and the first end of the second expansion valve, and the second end of the second expansion valve is connected to the first end of the first expansion valve.

[0036] In a second aspect, the present application provides a refrigerated vehicle, comprising a vehicle body and a refrigeration unit installed on the vehicle body, wherein the refrigeration unit is any refrigeration unit of the first aspect.

[0037] Compared with the prior art, the refrigeration unit and refrigerated truck provided by the present application have at least the following beneficial effects:

[0038] The refrigeration unit provided in the present application includes a condenser, a liquid reservoir, a filter drier and a sight glass, and is provided with a refrigerant inlet and a refrigerant outlet for the refrigerant to flow into and out of the condenser. The liquid reservoir is installed on the condenser, and the liquid reservoir is provided with a liquid storage chamber, a chamber inlet and a chamber outlet; the chamber inlet is respectively connected with the condenser and the liquid reservoir chamber, so that the refrigerant that has undergone heat exchange in the condenser is input into the liquid storage chamber through the chamber inlet; the chamber outlet is respectively connected with the liquid storage chamber and the condenser, so that the refrigerant in the liquid storage chamber is input into the condenser through the chamber outlet. The filter drier is installed in the liquid storage chamber to filter and dry at least part of the refrigerant flowing through the liquid storage chamber. The sight glass is installed on the side wall of the liquid reservoir, and the sight glass is connected with the liquid storage chamber.

[0039] It can be seen from the above description that in the refrigeration unit provided in the present application, by integrally installing the filter drier and the sight glass on the liquid reservoir and then connecting the liquid reservoir with the condenser, the connecting pipes can be reduced, thereby reducing the pipe connection points, thereby reducing the risk of refrigerant leakage between the condenser, the liquid reservoir, the filter drier and the sight glass.

[0040] The refrigerated vehicle provided in the present application includes the refrigeration unit, and thus has the same beneficial effects as the refrigeration unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying any creative work.

[0042] Figure 1 A schematic diagram of the three-dimensional structure of a refrigeration unit provided in an embodiment of the present application;

[0043] Figure 2 A schematic diagram of the three-dimensional structure of the refrigeration unit provided in an embodiment of the present application from another perspective;

[0044] Figure 3 A system schematic diagram of a refrigeration unit provided in an embodiment of the present application;

[0045] Figure 4 A cross-sectional view of the combined structure consisting of a condenser, a liquid reservoir, a drying filter, and a sight glass provided in an embodiment of the present application.

[0046] in Figure 1-4In: 1- compressor, 2- sensor, 3- three-way valve, 4- first expansion valve, 5- second expansion valve, 6- control module, 7- plate heat exchanger, 8- condenser, 9- evaporating fan, 10- evaporator, 11- filter, 12- desiccant, 13- sight glass, 14- liquid storage tank, 15- refrigerant inlet, 16- refrigerant outlet, 17- flat tube, 18- first chamber inlet, 19- second chamber inlet, 20- chamber outlet, 21- first collecting pipe, 22- second collecting pipe, 23- first partition, 24- second partition, 25- first pipe section, 26- second pipe section, 27- third pipe section, 28- fourth pipe section. DETAILED DESCRIPTION

[0047] The core of the present application is to provide a refrigeration unit that can reduce the risk of refrigerant leakage between the condenser, the liquid reservoir, the filter drier and the sight glass. Another core of the present application is to provide a refrigerated vehicle including the above refrigeration unit.

[0048] In order to enable those skilled in the art to better understand the technical solution of the present application, the present application is further described in detail below in conjunction with the accompanying drawings and implementation methods.

[0049] Please refer to Figures 1 to 4 .

[0050] In a specific embodiment, the refrigeration unit provided in the specific embodiment of the present application includes a condenser 8, a liquid storage tank 14, a drying filter and a sight glass 13. The condenser 8 is provided with a refrigerant inlet 15 and a refrigerant outlet 16 for the refrigerant to flow into and out of the condenser 8.

[0051] The liquid reservoir 14 is mounted on the condenser 8. The liquid reservoir 14 can be mounted on the condenser 8 by welding or the like. The liquid reservoir 14 is provided with a liquid storage chamber, a chamber inlet and a chamber outlet 20. Figure 4 As shown, there are two chamber inlets, namely a first chamber inlet 18 and a second chamber inlet 19; the chamber inlets are respectively connected to the condenser 8 and the liquid storage chamber, so that the refrigerant undergoing heat exchange in the condenser 8 is input into the liquid storage chamber through the chamber inlet; the chamber outlet 20 is respectively connected to the liquid storage chamber and the condenser 8, so that the refrigerant in the liquid storage chamber is input into the condenser 8 through the chamber outlet 20.

[0052] The filter drier is installed in the liquid storage chamber to filter and dry at least part of the refrigerant flowing through the liquid storage chamber. The sight glass 13 is installed on the side wall of the liquid storage chamber 14, and the sight glass 13 is connected to the liquid storage chamber. Specifically, the sight glass 13 can be installed at the bottom of the liquid storage chamber 14. Check whether the refrigerant is clean through the sight glass 13 and replace the refrigerant in time. Specifically, the sight glass 13 can be installed on the outer wall of the liquid storage chamber 14 by welding or the like.

[0053] It can be seen from the above description that in the refrigeration unit provided in the present application, by integrally installing the filter drier and the sight glass 13 on the liquid reservoir 14 and then connecting the liquid reservoir 14 with the condenser 8, the connecting pipes can be reduced, thereby reducing the pipe connection points, and therefore, the risk of refrigerant leakage between the condenser 8, the liquid reservoir 14, the filter drier and the sight glass 13 can be reduced.

[0054] When the system does not need a full supply of refrigerant, excess refrigerant can be temporarily stored in the accumulator 14. When more refrigerant is needed, the refrigerant in the accumulator 14 will also be added to the system to ensure heat exchange efficiency.

[0055] By directly integrating the filter drier and the sight glass 13 on the liquid reservoir 14, the outer shell and the fixed bracket can be reduced, thereby reducing the weight of the entire machine and improving the space utilization of the system, which is convenient for wide promotion and use.

[0056] In a specific embodiment, the condenser 8 includes a first collecting pipe 21, a second collecting pipe 22 and a heat exchange body. A first partition 23 is provided in the first collecting pipe 21. The first partition 23 separates the first collecting pipe 21 into a first pipe section 25 and a second pipe section 26. The first pipe section 25 is provided with a refrigerant inlet 15, and the second pipe section 26 is provided with a refrigerant outlet 16.

[0057] The refrigerant flows into the condenser 8 through the refrigerant inlet 15 , and the refrigerant flows out of the condenser 8 through the refrigerant outlet 16 .

[0058] A second partition plate 24 is disposed in the second header 22 , and the second partition plate 24 divides the second header 22 into a third pipe section 27 and a fourth pipe section 28 .

[0059] One end of the heat exchange body is communicated with the first pipe segment 25 and the second pipe segment 26 respectively, and the other end is communicated with the third pipe segment 27 and the fourth pipe segment 28 respectively.

[0060] The liquid storage tank 14 is installed on the second manifold 22 , and the chamber inlet is connected to the third pipe section 27 , and the chamber outlet 20 is connected to the fourth pipe section 28 .

[0061] In a specific embodiment, the heat exchange body includes flat tubes 17 and fins, the first tube segment 25 is connected to the third tube segment 27 through at least one flat tube 17, and the second tube segment 26 is connected to the fourth tube segment 28 through at least one flat tube 17. Preferably, the inner wall of the flat tube 17 is provided with a capillary structure and / or a microchannel groove.

[0062] Fins are provided between adjacent flat tubes 17. Preferably, the fins are streamlined, arc-shaped or S-shaped to increase the heat exchange area and improve the heat exchange efficiency.

[0063] In a specific embodiment, along the vertical plane projection, the top of the projection of the sight glass 13 is not higher than the top of the projection of the filter dryer, the bottom of the projection of the sight glass 13 is not lower than the bottom of the projection of the filter dryer, the top of the projection of the chamber outlet 20 is lower than the top of the projection of the filter dryer, and the bottom of the projection of the chamber outlet 20 is higher than the bottom of the projection of the filter dryer. The vertical plane is a plane perpendicular to the horizontal plane. Such an arrangement facilitates the refrigerant flowing out through the refrigerant outlet 16 to be more fully dried and filtered.

[0064] The drying filter includes a filter screen 11 and a desiccant 12 contained in the filter screen 11 .

[0065] Preferably, the filter screen 11 is a metal structure, and the filter screen 11 can be attached to the inner wall of the liquid storage container 14. Of course, the filter screen 11 can also be replaced with other filters. The refrigerant in the system is dried and filtered by the drying filter to ensure the cleanliness of the refrigerant in the system.

[0066] In order to facilitate replacement of the filter drier, preferably, the filter drier is detachably connected to the liquid reservoir 14 .

[0067] In order to improve assembly efficiency and further reduce the refrigerant leakage problem, preferably, the second manifold 22 and the liquid reservoir 14 are integrally formed, or the liquid reservoir 14 can be installed on one side of the second manifold 22 by welding or the like.

[0068] The refrigeration unit provided in the present application further includes a compressor 1 , a first expansion valve 4 , a sensor 2 and an evaporator 10 , the exhaust port of the compressor 1 is connected to the refrigerant inlet 15 , and the first end of the first expansion valve 4 is connected to the refrigerant outlet 16 .

[0069] The first end of the evaporator 10 is communicated with the second end of the first expansion valve 4 , and the second end of the evaporator 10 is communicated with the suction port of the compressor 1 .

[0070] In the cooling mode, the refrigerant flows through the compressor 1 , the condenser 8 , the first expansion valve 4 and the evaporator 10 in sequence, and then flows back to the compressor 1 .

[0071] The refrigeration unit provided in the present application also includes a three-way valve 3, which is provided with an inlet, a first outlet and a second outlet. The inlet is connected to the exhaust port, the first outlet is connected to the refrigerant inlet 15, and the second outlet is connected to the first end of the evaporator 10.

[0072] In the cooling mode, by operating the three-way valve 3, the inlet is connected to the first outlet, and the inlet is blocked from the second outlet.

[0073] In the heating mode, by operating the three-way valve 3, the inlet is connected to the second outlet, and the inlet is cut off from the first outlet. In order to reduce labor intensity and improve operation accuracy, preferably, the refrigeration unit also includes a control module 6, and the three-way valve 3 is connected to the control module 6 signal to control the action of the three-way valve 3 and control the refrigeration unit to perform the refrigeration mode or the heating mode. In the refrigeration mode, the flow path of the refrigerant is: compressor 1 → three-way valve 3 → condenser 8 → first expansion valve 4 → evaporator 10 → compressor 1. In the heating mode, the flow path of the refrigerant is: compressor 1 → three-way valve 3 → evaporator 10 → compressor 1. By switching the flow direction of the three-way valve 3, the flow direction of the system refrigerant is switched, and the switching of the heating and cooling functions is achieved.

[0074] The three-way valve 3 is set to connect the compressor 1 with the evaporator 10. When the heating mode is in progress, the high-temperature and high-pressure refrigerant flows to the evaporator 10, and the air exchanges heat with the evaporator 10. When the refrigeration unit is used in a refrigerated truck, the indoor heating of the refrigerated truck can be realized, that is, the indoor heating can be realized by the existing refrigeration unit of the refrigerated truck, and there is no need to set up a heating structure separately, that is, the switching of the heating and cooling functions of the whole machine is realized by the three-way valve 3, which is simple and convenient, and does not require separate power supply for heating, so there is no need to separately connect cables to the heating module, thereby reducing the safety risk of the whole vehicle. Therefore, the refrigeration unit provided by the present application can improve the operating safety of the refrigerated truck.

[0075] The refrigeration unit further includes an evaporation fan 9, through which forced convection heat exchange between indoor air and evaporator 10 can be achieved, and the heat exchange efficiency is high. Preferably, evaporation fan 9 is an adjustable speed fan. It can be understood that evaporation fan 9 refers to the indoor side fan.

[0076] The refrigeration unit also includes a condensing fan, through which forced convection heat exchange between the atmosphere and the condenser 8 can be achieved, with high heat exchange efficiency. Preferably, the condensing fan is a speed-adjustable fan.

[0077] The refrigeration unit provided in the present application also includes a plate heat exchanger 7 and a second expansion valve 5. The plate heat exchanger 7 includes a first heat exchange channel and a second heat exchange channel. Heat exchange can be performed between the first heat exchange channel and the second heat exchange channel. The two ends of the first heat exchange channel are respectively connected to the refrigerant outlet 16 and the first end of the first expansion valve 4. The two ends of the second heat exchange channel are respectively connected to the enthalpy increase port of the compressor 1 and the first end of the second expansion valve 5. The second end of the second expansion valve 5 is connected to the first end of the first expansion valve 4. After the liquid refrigerant passes through the condenser 8 and the first heat exchange channel of the plate heat exchanger 7, one path of the refrigerant is transported to the first expansion valve 4, and the first expansion valve 4 flows to the evaporator 10 after throttling. The other path of the refrigerant is transported to the second expansion valve 5, and the second expansion valve 5 flows to the second heat exchange channel of the plate heat exchanger 7 after throttling, absorbs the heat of the refrigerant in the first heat exchange channel of the plate heat exchanger 7, evaporates into gas and returns to the compressor 1, and realizes the air replenishment and enthalpy increase of the compressor 1, so as to improve the energy efficiency and safety and reliability of the compressor 1.

[0078] The present application provides a refrigerated vehicle including a vehicle body and a refrigeration unit installed on the vehicle body, wherein the refrigeration unit is any of the above refrigeration units. The above text describes the specific structure of the refrigeration unit, and the present application includes the above refrigeration unit and also has the above technical effects.

[0079] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0080] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A refrigeration unit, characterized in that: include: The condenser (8) is provided with a refrigerant inlet (15) and a refrigerant outlet (16) for allowing the refrigerant to flow into and out of the condenser (8); A liquid storage device (14) is installed on the condenser (8), and the liquid storage device (14) is provided with a liquid storage chamber, a chamber inlet and a chamber outlet (20); the chamber inlet is respectively connected to the condenser (8) and the liquid storage chamber, so that the refrigerant that has undergone heat exchange in the condenser (8) is input into the liquid storage chamber through the chamber inlet; the chamber outlet (20) is respectively connected to the liquid storage chamber and the condenser (8), so that the refrigerant in the liquid storage chamber is input into the condenser (8) through the chamber outlet (20); a drying filter installed in the liquid storage chamber to filter and dry at least a portion of the refrigerant flowing through the liquid storage chamber; A sight glass (13) is installed on the side wall of the liquid storage container (14), and the sight glass (13) is connected to the liquid storage chamber.

2. The refrigeration unit according to claim 1, characterized in that: The condenser (8) comprises: A first header (21) having a first partition (23) therein, wherein the first partition (23) divides the first header (21) into a first pipe section (25) and a second pipe section (26), wherein the first pipe section (25) is provided with the refrigerant inlet (15), and the second pipe section (26) is provided with the refrigerant outlet (16); A second header (22) is provided with a second partition (24) therein, wherein the second partition (24) divides the second header (22) into a third pipe section (27) and a fourth pipe section (28); A heat exchange body, one end of which is respectively connected to the first pipe section (25) and the second pipe section (26), and the other end of which is respectively connected to the third pipe section (27) and the fourth pipe section (28); Wherein: the liquid storage device (14) is installed on the second manifold (22), and the chamber inlet is connected to the third pipe section (27), and the chamber outlet (20) is connected to the fourth pipe section (28).

3. The refrigeration unit according to claim 2, characterized in that: The heat exchange body comprises: flat tubes (17), the first tube section (25) being connected to the third tube section (27) through at least one of the flat tubes (17), and the second tube section (26) being connected to the fourth tube section (28) through at least one of the flat tubes (17); Fins are provided between adjacent flat tubes (17).

4. The refrigeration unit according to claim 3, characterized in that: The inner wall of the flat tube (17) is provided with a capillary structure and / or a microchannel groove; and / or The fins are streamlined, arc-shaped or S-shaped.

5. The refrigeration unit according to claim 1, characterized in that: Projected along a vertical plane, the top of the projection of the sight glass (13) is not higher than the top of the projection of the dry filter, and the bottom of the projection of the sight glass (13) is not lower than the bottom of the projection of the dry filter. The top of the projection of the chamber outlet (20) is lower than the top of the projection of the dry filter, and the bottom of the projection of the chamber outlet (20) is higher than the bottom of the projection of the dry filter.

6. The refrigeration unit according to claim 1, characterized in that: The drying filter comprises a filter screen (11) and a desiccant (12) contained in the filter screen (11); The drying filter is detachably connected to the liquid storage container (14).

7. The refrigeration unit according to claim 1, characterized in that: Also includes: A compressor (1), wherein an exhaust port of the compressor (1) is in communication with the refrigerant inlet (15); a first expansion valve (4), wherein a first end of the first expansion valve (4) is in communication with the refrigerant outlet (16); an evaporator (10), wherein a first end of the evaporator (10) is in communication with a second end of the first expansion valve (4), and a second end of the evaporator (10) is in communication with an air intake port of the compressor (1); In the refrigeration mode, the refrigerant flows through the compressor (1), the condenser (8), the first expansion valve (4) and the evaporator (10) in sequence, and then flows back to the compressor (1).

8. The refrigeration unit according to claim 7, characterized in that: It also includes a three-way valve (3), the three-way valve (3) being provided with an inlet, a first outlet and a second outlet, the inlet being communicated with the exhaust port, the first outlet being communicated with the refrigerant inlet (15), and the second outlet being communicated with the first end of the evaporator (10); In the cooling mode, the three-way valve (3) is operated so that the inlet is connected to the first outlet and the inlet is blocked from the second outlet; In the heating mode, by operating the three-way valve (3), the inlet is connected to the second outlet, and the inlet is blocked from the first outlet.

9. The refrigeration unit according to claim 8, characterized in that: The invention also comprises a plate heat exchanger (7) and a second expansion valve (5), wherein the plate heat exchanger (7) comprises a first heat exchange channel and a second heat exchange channel, wherein heat exchange can be performed between the first heat exchange channel and the second heat exchange channel, wherein two ends of the first heat exchange channel are respectively connected to the refrigerant outlet (16) and the first end of the first expansion valve (4), and two ends of the second heat exchange channel are respectively connected to the enthalpy increase port of the compressor (1) and the first end of the second expansion valve (5), and the second end of the second expansion valve (5) is connected to the first end of the first expansion valve (4).

10. A refrigerated vehicle, comprising a vehicle body and a refrigeration unit mounted on the vehicle body, characterized in that: The refrigeration unit is the refrigeration unit according to any one of claims 1 to 9.

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