Refrigerating unit and refrigerator car

Abstract

The refrigerating unit comprises a condenser, a compressor, an evaporator, a first expansion valve and a flow path switching device, the flow path switching device is provided with an inlet, a first outlet and a second outlet, the inlet communicates with an exhaust port of the compressor, the first outlet communicates with the first end of the condenser, and the second outlet communicates with the second end of the condenser; the second end of the condenser communicates with the first end of the first expansion valve, the second end of the first expansion valve communicates with the first end of the evaporator, the second end of the evaporator communicates with an air suction port of the compressor, and the second outlet communicates with the first end of the evaporator; in the refrigeration mode, the flow path switching device is operated, so that the inlet is communicated with the first outlet, and the inlet is cut off from the second outlet; and in the heating mode, the flow path switching device is operated, so that the inlet is communicated with the second outlet, and the inlet is cut off from the first outlet. Compared with the condition that a heating module is externally arranged on a traditional refrigerating unit and power is supplied independently, an external heating module and a leading cable are not needed, and the operation safety of the refrigerator car is improved.

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 refrigerated trucks are provided with a refrigeration unit and a heating module on their bodies. Specifically, the heating module is placed outside the refrigeration unit, and the refrigeration unit is used to cool the compartment of the refrigerated truck, and the heating module is used to heat the compartment of the refrigerated truck.

[0003] In the process of implementing the present application, the inventors found that there are at least the following problems in the conventional technology:

[0004] The external heating module on the refrigeration unit requires an additional control structure and a separate power supply, and a separate cable needs to be connected to the heating module, which poses a major safety hazard and electromagnetic interference, resulting in lower operating safety of the refrigerated truck.

[0005] Therefore, how to improve the operating safety of refrigerated trucks 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 and a refrigerated truck, which can improve the operating safety of the refrigerated truck.

[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, including a condenser, a compressor, an evaporator, a first expansion valve, and a flow path switching device, wherein the flow path switching device is provided with an inlet, a first outlet, and a second outlet, wherein the inlet is communicated with an exhaust port of the compressor, the first outlet is communicated with a first end of the condenser, the second end of the condenser is communicated with a first end of the first expansion valve, the second end of the first expansion valve is communicated with a first end of the evaporator, the second end of the evaporator is communicated with an air intake port of the compressor, and the second outlet is communicated with the first end of the evaporator;

[0009] in:

[0010] In the cooling mode, the flow path switching device is operated so that the inlet is connected to the first outlet and the inlet is blocked from the second outlet;

[0011] In the heating mode, the flow path switching device is operated so that the inlet is connected to the second outlet and the inlet is blocked from the first outlet.

[0012] In a possible design, the flow path switching device includes a three-way valve, the three-way valve is provided with the inlet, the first outlet, and the second outlet, and the inlet is connected to either the first outlet or the second outlet.

[0013] In one possible design, the flow path switching device includes:

[0014] A first connecting pipe, provided with an outlet and the inlet;

[0015] a first switch valve, wherein the first switch valve is provided with a first inlet and the first outlet, and the first inlet is communicated with the outlet of the first connecting pipe;

[0016] a second connecting pipe connected between the outlet of the first connecting pipe and the inlet;

[0017] The second switch valve is provided with a second inlet and the second outlet, and the second inlet is communicated with the second connecting pipe.

[0018] In a possible design, a control module is further included, and the flow path switching device is connected to the control module signal to control the action of the flow path switching device and control the refrigeration unit to execute a cooling mode or a heating mode.

[0019] 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 second end of the condenser and the first end of the first expansion valve, and 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. The second end of the second expansion valve is connected to the first end of the first expansion valve.

[0020] In a possible design, the first expansion valve and / or the second expansion valve is an electronic expansion valve.

[0021] In a possible design, an evaporation fan is also included, and the evaporation fan is an adjustable speed fan.

[0022] In one possible design, the condenser is a microchannel heat exchanger.

[0023] In a possible design, a condensing fan is also included, and the condensing fan is a speed-adjustable fan.

[0024] 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 the refrigeration unit described in any one of the first aspects.

[0025] Compared with the prior art, the refrigeration unit and refrigerated truck provided by the present application have at least the following beneficial effects:

[0026] The refrigeration unit provided in the present application includes a condenser, a compressor, an evaporator, a first expansion valve and a flow switching device, wherein the flow switching device is provided with an inlet, a first outlet and a second outlet, wherein the inlet is connected to the exhaust port of the compressor, the first outlet is connected to the first end of the condenser, the second end of the condenser is connected to the first end of the first expansion valve, the second end of the first expansion valve is connected to the first end of the evaporator, the second end of the evaporator is connected to the air intake port of the compressor, and the second outlet is connected to the first end of the evaporator. In the cooling mode, the inlet is connected to the first outlet by operating the flow switching device, and the inlet is cut off from the second outlet. In the heating mode, the inlet is connected to the second outlet by operating the flow switching device, and the inlet is cut off from the first outlet.

[0027] It can be known from the above description that in the refrigeration unit provided in the present application, by operating the flow switching device, in the cooling mode, the flow of the refrigerant is compressor-flow switching device-condenser-first expansion valve-evaporator-compressor, and in the heating mode, the flow of the refrigerant is compressor-flow switching device-evaporator-compressor. That is, a flow switching device is added to the traditional refrigeration unit to realize the heating work of the refrigeration unit. Compared with the external heating module and the independent power supply on the traditional refrigeration unit, there is no need for an external heating module, and there is no need for additional wiring cables, thereby reducing safety hazards and electromagnetic interference. That is, the refrigeration unit provided by the present application is applied to refrigerated trucks, which can improve the operating safety of refrigerated trucks.

[0028] 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

[0029] 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.

[0030] Figure 1 A three-dimensional structural diagram of a refrigeration unit provided in an embodiment of the present application;

[0031] Figure 2 A three-dimensional structural diagram of a refrigeration unit from another perspective provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of the layout of the refrigeration unit provided in an embodiment of the present application.

[0033] in Figure 1-3 In: 1-compressor, 2-sensor, 3-flow switching device, 4-first expansion valve, 5-second expansion valve, 6-control module, 7-plate heat exchanger, 8-condenser, 9-evaporating fan, 10-evaporator, 11-first pipeline, 12-third pipeline, 13-second pipeline. DETAILED DESCRIPTION

[0034] The core of the present application is to provide a refrigeration unit, which can improve the operating safety of a refrigerated truck.

[0035] 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.

[0036] Please refer to Figures 1 to 3 .

[0037] In a specific embodiment, the refrigeration unit provided in the specific embodiment of the present application includes a condenser 8, a compressor 1, an evaporator 10, a first expansion valve 4 and a flow switching device 3, the flow switching device 3 is provided with an inlet, a first outlet and a second outlet, the inlet is connected to the exhaust port of the compressor 1, the first outlet is connected to the first end of the condenser 8, the second end of the condenser 8 is connected to the first end of the first expansion valve 4, the second end of the first expansion valve 4 is connected to the first end of the evaporator 10, the second end of the evaporator 10 is connected to the suction port of the compressor 1, and the second outlet is connected to the first end of the evaporator 10.

[0038] In the cooling mode, the flow path switching device 3 is operated so that the inlet is connected to the first outlet and the inlet is blocked from the second outlet.

[0039] In the heating mode, the flow path switching device 3 is operated so that the inlet is connected to the second outlet and the inlet is blocked from the first outlet.

[0040] Among them, in order to reduce labor intensity and improve operation accuracy, preferably, the refrigeration unit also includes a control module 6, and the flow switching device 3 is connected to the control module 6 signal to control the action of the flow switching device 3 and control the refrigeration unit to execute the cooling mode or the heating mode.

[0041] In a specific embodiment, the flow path switching device 3 includes a three-way valve, which is provided with an inlet, a first outlet, and a second outlet, and the inlet is connected to either the first outlet or the second outlet.

[0042] The three-way valve may be an electric three-way valve, and the operation of the three-way valve may be controlled by the control module 6. The three-way valve is connected to the control module 6 by signals, and the control module 6 controls the refrigeration unit to execute a cooling mode or a heating mode.

[0043] During specific assembly, the inlet of the three-way valve is connected to the compressor 1 through the third pipeline 12, the first outlet of the three-way valve is connected to the condenser 8 through the second pipeline 13, and the second outlet of the three-way valve is connected to the evaporator 10 through the first pipeline 11. Specifically, the third pipeline 12 is provided with a sensor 2, which can be a high-pressure pressure sensor.

[0044] When the refrigeration unit is in cooling mode, the inlet of the three-way valve is connected to the first outlet of the three-way valve, and the inlet of the three-way valve is blocked from the second outlet of the three-way valve. When the refrigeration unit is in heating mode, the inlet of the three-way valve is connected to the second outlet of the three-way valve, and the inlet of the three-way valve is blocked from the first outlet of the three-way valve.

[0045] It can be understood that the flow path of the refrigerant in the cooling mode is: compressor 1 → three-way valve → condenser 8 → first expansion valve 4 → evaporator 10 → compressor 1. The flow path of the refrigerant in the heating mode is: compressor 1 → three-way valve → evaporator 10 → compressor 1. By switching the flow direction of the three-way valve, the flow direction of the system refrigerant is realized, and the switching of the heating and cooling functions is achieved.

[0046] In another specific embodiment, the flow path switching device 3 includes a first connecting pipe, a first switch valve, a second connecting pipe and a second switch valve; the first connecting pipe is provided with an outlet and an inlet; the first switch valve is provided with a first inlet and a first outlet, and the first inlet is connected to the outlet of the first connecting pipe; the second connecting pipe is connected between the outlet and the inlet of the first connecting pipe; the second switch valve is provided with a second inlet and a second outlet, and the second inlet is connected to the second connecting pipe.

[0047] Specifically, the opening and closing of the first switch valve and the second switch valve can be controlled by the control module 6. Specifically, in the cooling mode, the control module 6 controls the first switch valve to open and the second switch valve to close. In the heating mode, the control module 6 controls the first switch valve to close and the second switch valve to open.

[0048] In the refrigeration unit provided in the specific embodiment of the present application, a three-way valve is provided to connect the compressor 1 and 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 to achieve indoor heating of the refrigerated truck. That is, the indoor heating can be achieved through the existing refrigeration unit of the refrigerated truck, and there is no need to set up a separate heating structure. That is, the switching of the heating and cooling functions of the whole machine is achieved through the three-way valve, which is simple and convenient, and does not require separate power supply for heating. Therefore, 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.

[0049] On the other hand, the present application realizes that the heating and cooling units of the whole machine use a set of evaporators 10, and can effectively reduce electromagnetic interference, reduce the weight of the whole vehicle, make the air duct smoother, and increase the cooling and heating efficiency.

[0050] In a specific embodiment, the refrigeration unit further comprises an evaporating fan 9, through which forced convection heat exchange between the indoor air and the evaporator 10 can be achieved, and the heat exchange efficiency is high. Preferably, the evaporating fan 9 is an adjustable speed fan.

[0051] Specifically, the evaporator fan 9 is located indoors (i.e., in the compartment of the refrigerated truck). The gas circulation power provided by the evaporator fan 9 can realize the gas circulation flow indoors, so that the air and the evaporator 10 are forced to exchange heat by convection, so as to achieve the effect of cooling or heating. Specifically, the evaporator fan 9 can use the PWM speed regulation function to make the temperature accuracy of the refrigeration unit more efficiently controlled.

[0052] In order to further improve the cooling and heating efficiency, preferably, a plurality of evaporation fans 9 can be provided, and the evaporation fans 9 are arranged in sequence along the length direction of the evaporator 10. Preferably, two adjacent evaporation fans 9 are equally spaced. The evaporation fans 9 can be located upstream of the chamber where the evaporator 10 is located.

[0053] In order to prevent impurities from clogging the evaporator 10, a filter screen may be provided to filter the air. Specifically, the filter screen is detachably connected to the housing of the evaporator 10, or the filter screen and the housing of the evaporator 10 are integrally formed.

[0054] The refrigeration unit also includes a condensing fan, which is an adjustable speed fan.

[0055] In order to reduce the weight of the refrigeration unit, preferably, the inner channel of the condenser 8 is an aluminum alloy tube. In a specific embodiment, the condenser 8 is a microchannel condenser, which makes the refrigeration of the refrigeration unit more efficient and reduces the weight of the whole machine. Specifically, the condenser 8 uses a microchannel heat exchanger 7 of an aluminum alloy tube to improve the refrigeration efficiency.

[0056] In a specific embodiment, the refrigeration unit further includes a plate heat exchanger 7 and a second expansion valve 5. By using the plate heat exchanger 7, the refrigerant in the condenser 8 is supercooled, and the evaporated refrigerant returns to the compressor 1, thereby achieving the purpose of replenishing air and increasing enthalpy.

[0057] The plate heat exchanger 7 includes a first heat exchange channel and a second heat exchange channel, and 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 second end of the condenser 8 and the first end of the first expansion valve 4, and 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, and the second end of the second expansion valve 5 is connected to the first end of the first expansion valve 4.

[0058] For ease of control, preferably, at least one of the first expansion valve 4 and the second expansion valve 5 is an electronic expansion valve.

[0059] It can be understood that 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, and the other path of the refrigerant passes through 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, thereby realizing 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.

[0060] The control module 6 may be a main controller capable of controlling the operation of the entire refrigeration unit. Specifically, the control module 6 controls the switching of the flow direction of the three-way valve. During specific operation, in the heating mode, the high-temperature and high-pressure refrigerant flows to the evaporator 10 to achieve the heating function. In the cooling mode, the high-temperature and high-pressure refrigerant flows to the microchannel condenser 8, is throttled by the expansion valve, and evaporates in the evaporator 10 to achieve the cooling function. By controlling the operation of the three-way valve through the control module 6 of the refrigerant unit, there is no need to set up a separate three-way valve control structure to reduce costs and reduce the overall volume.

[0061] From the above description, it can be seen that compared with the external heating module and independent power supply on the traditional refrigeration unit, the present application does not require an external heating module, and no additional cables are required, thereby reducing safety hazards and electromagnetic interference. That is, the refrigeration unit provided by the present application is applied to refrigerated trucks, which can improve the operating safety of refrigerated trucks.

[0062] 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.

[0063] 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.

[0064] 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: The invention comprises a condenser (8), a compressor (1), an evaporator (10), a first expansion valve (4) and a flow path switching device (3), wherein the flow path switching device (3) is provided with an inlet, a first outlet and a second outlet, wherein the inlet is communicated with an exhaust port of the compressor (1), the first outlet is communicated with a first end of the condenser (8), the second end of the condenser (8) is communicated with a first end of the first expansion valve (4), the second end of the first expansion valve (4) is communicated with a first end of the evaporator (10), the second end of the evaporator (10) is communicated with an air intake port of the compressor (1), and the second outlet is communicated with the first end of the evaporator (10); in: In the cooling mode, the flow path switching device (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 flow path switching device (3), the inlet is connected to the second outlet, and the inlet is blocked from the first outlet.

2. The refrigeration unit according to claim 1, characterized in that: The flow path switching device (3) comprises a three-way valve, the three-way valve is provided with the inlet, the first outlet, and the second outlet, and the inlet is connected to either the first outlet or the second outlet.

3. The refrigeration unit according to claim 1, characterized in that: The flow path switching device (3) comprises: A first connecting pipe, provided with an outlet and the inlet; a first switch valve, wherein the first switch valve is provided with a first inlet and the first outlet, and the first inlet is communicated with the outlet of the first connecting pipe; a second connecting pipe connected between the outlet of the first connecting pipe and the inlet; The second switch valve is provided with a second inlet and the second outlet, and the second inlet is communicated with the second connecting pipe.

4. The refrigeration unit according to claim 2 or 3, characterized in that: It also includes a control module (6), and the flow path switching device (3) is connected to the control module (6) by signal so as to control the action of the flow path switching device (3) and control the refrigeration unit to execute a cooling mode or a heating mode.

5. The refrigeration unit according to claim 1, characterized in that: The heat exchanger (7) further 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 second end of the condenser (8) 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).

6. The refrigeration unit according to claim 5, characterized in that: The first expansion valve (4) and / or the second expansion valve (5) are electronic expansion valves.

7. The refrigeration unit according to claim 1, characterized in that: It also comprises an evaporation fan (9), wherein the evaporation fan (9) is a speed-adjustable fan.

8. The refrigeration unit according to claim 1, characterized in that: The condenser (8) is a microchannel heat exchanger.

9. The refrigeration unit according to claim 1, characterized in that: It also includes a condensing fan, which is a speed-adjustable fan.

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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