Refrigerator car

Abstract

The invention belongs to the technical field of refrigerator cars, and discloses a refrigerator car which comprises a chassis, a refrigerator compartment, a refrigerating unit and a plurality of evaporating units, the refrigerator compartment is located above the chassis, and the refrigerator compartment can abut against and be away from the chassis in the height direction. The refrigerating unit is installed below the chassis and comprises a compressor and a condenser. The multiple evaporation units are installed on the top in the refrigerator compartment and evenly distributed in the length direction of the refrigerator compartment, the refrigerating unit is communicated with all the evaporation units through a pipeline system, each evaporation unit comprises an expansion valve and an evaporator, and the compressor, the condenser, the expansion valve and the evaporator are sequentially communicated in a circulating mode. The refrigerator car overcomes the disadvantage that the air supply distance of a refrigerator compartment is too large, so that the refrigeration temperature field in the compartment is more uniform.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerated trucks, and in particular to a refrigerated truck. Background Art

[0002] With the increase in civil aviation passenger business, aviation food refrigerated trucks are required to frequently travel between airports and catering stations. The fixed working area, short travel distance, and strong working regularity of civil aviation equipment determine the strong feasibility of using new energy airport equipment. Aviation food refrigerated trucks generally adopt an operation mode of loading cargo at the rear of the car and unloading from the front after lifting the car body. The cargo storage and transportation and turnover channels run through the front and rear of the car body, and the deployment of each unit of the refrigeration machine needs targeted consideration.

[0003] Most existing refrigerated trucks fix the evaporator on the side wall at the front end of the car. Due to the long box body and the single refrigeration point, the temperature at the front end of the car close to the refrigeration point is lower, and the temperature at the rear end of the car far from the refrigeration point is relatively higher. The temperature distribution in the refrigerated car is uneven, which affects the refrigeration effect and reduces the refrigeration quality.

[0004] Therefore, a refrigerated vehicle is needed urgently to solve the above problems. Summary of the invention

[0005] The object of the present invention is to provide a refrigerated vehicle which can make the refrigeration temperature field in the vehicle compartment more uniform.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] A refrigerated vehicle is provided, comprising:

[0008] A chassis and a refrigerated compartment, wherein the refrigerated compartment is located above the chassis and can abut against and move away from the chassis in a height direction;

[0009] A refrigeration unit, the refrigeration unit is installed below the chassis, and the refrigeration unit includes a compressor and a condenser;

[0010] Multiple evaporator units are installed on the top of the refrigerated compartment, and the multiple evaporator units are evenly distributed in the length direction of the refrigerated compartment. The refrigeration unit is connected to all the evaporator units through a pipeline system. The evaporator unit includes an expansion valve and an evaporator. The compressor, the condenser, the expansion valve and the evaporator are cyclically connected in sequence.

[0011] As an optional solution for the refrigerated truck, the refrigerated truck also includes a defrost unit, which includes a defrost valve and a first connecting pipe, the first connecting pipe is connected to the liquid outlet of the compressor and the liquid inlet of the evaporator, and the defrost valve is connected to the first connecting pipe.

[0012] As an optional solution for the refrigerated truck, the refrigeration unit further includes a first separator, and the first separator is connected between the compressor and the evaporator.

[0013] As an optional solution for the refrigerated truck, the refrigeration unit further includes a second separator, and the second separator is connected between the compressor and the condenser.

[0014] As an optional solution for the refrigerated vehicle, the refrigeration unit further includes a refrigeration valve, and the refrigeration valve is arranged on a pipeline connecting the second separator and the condenser.

[0015] As an optional solution for the refrigerated truck, the refrigeration unit further includes a first fan, and the first fan is arranged toward the condenser.

[0016] As an optional solution for the refrigerated vehicle, the refrigeration unit further includes a liquid storage device, and the liquid storage device is connected between the condenser and the expansion valve.

[0017] As an optional solution for the refrigerated truck, the refrigeration unit further includes a filtering device, and the filtering device is connected between the condenser and the expansion valve.

[0018] As an optional solution for a refrigerated truck, the filtering device further includes a sight glass.

[0019] As an optional solution for the refrigerated vehicle, the evaporator unit further includes a second fan, and the second fan is arranged toward the evaporator.

[0020] Beneficial effects of the present invention:

[0021] The present invention provides a refrigerated vehicle, in which a plurality of evaporating units are installed on the top of the refrigerated compartment, and the plurality of evaporating units are evenly distributed in the length direction of the refrigerated compartment, so that the air supply distance in the length direction can be shortened in the narrow and long refrigerated compartment, and the problem of uneven temperature in the compartment caused by different air supply distances at different positions in the refrigerated compartment due to the installation of a single evaporator is avoided, so that the refrigeration temperature field in the refrigerated compartment is more uniform. The refrigerated vehicle integrates the refrigeration unit under the chassis, which can not only save the space above the chassis, reserve space for the refrigerated compartment, and expand the storage capacity of the refrigerated compartment, but also reduce obstacles on the path of loading and unloading goods in the refrigerated vehicle, ensure smooth turnover of loading and unloading items, and improve turnover efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a structural schematic diagram of the refrigerated vehicle provided by the present invention;

[0023] Figure 2It is a system diagram of a refrigeration unit of a refrigerated vehicle provided by the present invention;

[0024] Figure 3 It is a system diagram of the evaporating unit of the refrigerated truck provided by the present invention.

[0025] In the figure:

[0026] 1. Chassis; 2. Refrigerated compartment; 3. Cockpit; 4. Wheels;

[0027] 100, refrigeration unit; 101, compressor; 102, condenser; 103, first separator; 104, second separator; 105, refrigeration valve; 106, first fan; 107, liquid storage device; 108, filter device; 109, pressure regulating valve; 110, low pressure control switch; 111, high pressure control switch; 112, check valve; 113, pressure relief valve;

[0028] 200, evaporation unit; 201, expansion valve; 202, evaporator; 203, second fan;

[0029] 300. Pipeline system;

[0030] 400, defrost unit; 401, defrost valve; 402, first connecting pipe; 403, second connecting pipe; 404, one-way valve. DETAILED DESCRIPTION

[0031] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0032] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0033] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0034] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0035] like Figures 1 to 3 As shown, the refrigerated truck of this embodiment includes a chassis 1, a refrigerated compartment 2, a cab 3, wheels 4 and a lifting support frame (not shown in the figure). The cab 3 is connected to the front end of the chassis 1, the refrigerated compartment 2 is located above the chassis 1, and the lifting support frame is connected between the chassis 1 and the refrigerated compartment 2. The lifting support frame can support the refrigerated compartment 2 to abut against and away from the chassis 1 in the height direction, and the height direction is a direction perpendicular to the chassis 1 ( Figure 1 X direction), that is, the refrigerated compartment 2 can be lifted and moved on the chassis 1. When the refrigerated compartment 2 needs to be loaded, the lifting support frame descends so that the refrigerated compartment 2 abuts against the chassis 1. At this time, the refrigerated compartment 2 drops to the lowest point, reducing the lifting height of the goods during loading; when the refrigerated compartment 2 needs to be unloaded, the lifting support frame raises the height of the refrigerated compartment 2 so that the height of the refrigerated compartment 2 is higher than the height of the cab 3, thereby avoiding the cab 3 from obstructing the unloading of goods. A plurality of wheels 4 are provided, and a plurality of wheels 4 are connected to the chassis 1 or the bottom of the cab 3 to support and drive the refrigerated truck. A certain height is also retained below the chassis 1 to prevent the chassis 1 from being bumped and worn when passing through a raised or concave road surface.

[0036] The refrigerated vehicle further includes a refrigeration unit 100 and a plurality of evaporation units 200. The refrigeration unit 100 is integrated and installed under the chassis 1 through reasonable shape and size design, wherein the refrigeration unit 100 at least includes a compressor 101 and a condenser 102. The plurality of evaporation units 200 are all installed on the top of the refrigerated compartment 2, and the plurality of evaporation units 200 are evenly distributed in the length direction of the refrigerated compartment 2, wherein the length direction is the forward direction of the refrigerated vehicle ( Figure 1The refrigeration unit 100 is connected to all evaporation units 200 through a pipeline system 300. The evaporation unit 200 includes an expansion valve 201 and an evaporator 202. The compressor 101, the condenser 102, the expansion valve 201 and the evaporator 202 are cyclically connected in sequence.

[0037] Based on the above design, the refrigerated truck provided in this embodiment is equipped with multiple evaporator units 200 on the top of the refrigerated compartment 2, and the multiple evaporator units 200 are evenly distributed in the length direction of the refrigerated compartment 2, which can shorten the air supply distance in the length direction in the narrow and long refrigerated compartment 2, avoiding the problem of different air supply distances at different positions in the refrigerated compartment 2 caused by setting a single evaporator, and then causing uneven temperature in the compartment, making the refrigeration temperature field in the refrigerated compartment 2 more uniform. The refrigerated truck integrates the refrigeration unit 100 under the chassis 1, which can not only save space above the chassis 1, reserve enough space for the refrigerated compartment 2, and expand the storage capacity of the refrigerated compartment 2, but also reduce obstacles on the path of loading and unloading goods in the refrigerated truck, ensure smooth turnover of loading and unloading goods, and improve turnover efficiency.

[0038] It should be noted that since the refrigerated compartment 2 needs to be lifted and moved, the distance between the refrigeration unit 100 and the evaporator unit 200 will also change. Therefore, the pipeline system 300 is set to multiple hoses, and the pipeline system 300 is connected to the lifting support frame so that the hose can change the bending angle as the lifting support frame is deformed, thereby ensuring the flexible bending of the pipeline system 300 and extending the service life of the pipeline system 300.

[0039] When the refrigeration unit 100 and the evaporator unit 200 are working, the compressor 101 inhales the low-temperature and low-pressure refrigerant gas from the evaporator 202, compresses it into a high-temperature and high-pressure gas, and then flows into the core of the condenser 102. The refrigerant releases heat to the ambient air and condenses into a liquid with a certain degree of supercooling; the refrigerant liquid passes through the expansion valve 201, throttles and reduces the pressure before entering the core of the evaporator 202; the low-temperature and low-pressure refrigerant liquid continuously vaporizes and evaporates in the core of the evaporator 202, absorbs the heat in the insulation box, and reaches the temperature requirement of the insulation box.

[0040] Preferably, the refrigeration unit 100 includes a first fan 106, which is arranged toward the condenser 102 and can blow air toward the condenser 102, thereby accelerating the air flow speed on the surface of the condenser 102 core, improving the heat exchange efficiency between the refrigerant in the condenser 102 core and the external air, and thereby improving the cooling efficiency of the refrigeration unit 100.

[0041] Preferably, the evaporator unit 200 includes a second fan 203, which is arranged toward the evaporator 202 and can blow air toward the evaporator 202, thereby accelerating the air flow speed on the surface of the evaporator 202 core, improving the heat exchange efficiency between the refrigerant in the evaporator 202 core and the air in the refrigerated compartment 2, and ensuring the temperature stability in the refrigerated compartment 2.

[0042] Furthermore, the refrigeration unit 100 further includes a first separator 103, which is connected between the evaporator 202 and the compressor 101. The refrigerant flowing out of the evaporator 202 enters the first separator 103, which is a gas-liquid separator that can separate the refrigerant gas and liquid so that the refrigerant gas can continue to flow to the compressor 101.

[0043] Optionally, the refrigeration unit 100 further includes a pressure regulating valve 109 and a low pressure control switch 110, which are connected between the evaporator 202 and the compressor 101. Along the refrigerant flow direction, the first separator 103, the pressure regulating valve 109 and the low pressure control switch 110 are connected in sequence. The pressure regulating valve 109 is used to adjust the pressure of the refrigerant gas flowing out of the first separator 103, and adjust the gas pressure of the refrigerant to be within a predetermined gas pressure range. When the refrigerant gas pressure meets the preset gas pressure range, the low pressure control switch 110 is turned on to allow the refrigerant gas to enter the compressor 101.

[0044] Furthermore, the refrigeration unit 100 further includes a second separator 104, which is connected between the compressor 101 and the condenser 102. The second separator 104 is an oil-liquid separator, which is used to separate the high-temperature and high-pressure refrigerant gas and lubricating oil flowing out of the compressor 101, so that the refrigerant gas enters the condenser 102, and the separated lubricating oil can be returned to the first separator 103 to maintain the good lubrication and sealing performance of the first separator 103.

[0045] Optionally, the refrigeration unit 100 further includes a high-pressure control switch 111, which is disposed on a pipeline connecting the liquid outlet of the compressor 101 and the liquid inlet of the second separator 104 to prevent the refrigerant pressure from being too high and causing damage to the refrigeration unit 100.

[0046] Optionally, the refrigeration unit 100 further includes a refrigeration valve 105 , which is disposed on a pipeline connecting the second separator 104 and the condenser 102 , and is used to control the opening and closing of a passage between the second separator 104 and the condenser 102 .

[0047] Furthermore, the refrigeration unit 100 further includes a liquid storage device 107, which is connected between the condenser 102 and the expansion valve 201 and is used to store liquid components in the refrigerant, which helps to reduce the load of the condenser 102 and prevents excessive accumulation of condensate in the condenser 102, thereby affecting the heat transfer effect of the condenser 102. In addition, the liquid storage device 107 can also adjust the supply of refrigerant according to the change of the load of the evaporator 202, ensuring that the supply of refrigerant adapts to the load change of the evaporator 202.

[0048] Optionally, a check valve 112 and a pressure relief valve 113 are further provided between the condenser 102 and the liquid storage device 107. The check valve 112 is connected to the outlet of the condenser 102 to prevent the refrigerant flowing out of the condenser 102 from flowing back, thereby ensuring the safe use of the condenser 102. The pressure relief valve 113 is connected between the check valve 112 and the liquid storage device 107. When the pressure of the refrigeration unit 100 is too high, the pressure relief valve 113 will automatically open to release the excess pressure, thereby preventing the equipment from being damaged due to excessive pressure.

[0049] Furthermore, the refrigeration unit 100 also includes a filtering device 108, which is connected between the condenser 102 and the expansion valve 201. In the present embodiment, the filtering device 108 is a drying filter, which can absorb moisture contained in the refrigeration unit 100, prevent ice blockage of the expansion valve 201, and reduce the corrosion of moisture on accessories in the refrigeration unit 100. The filtering device 108 can also filter out impurities in the refrigeration unit, such as rust, dirt, metal particles, etc., to prevent these impurities from damaging the compressor 101, while avoiding clogging of the filter screen and the expansion valve 201.

[0050] Optionally, the filtering device 108 further includes a sight glass (not shown in the figure), through which the flow state of the refrigerant and the gas-liquid phase change can be observed, which helps to detect the water vapor content in the refrigerant and thus determine the operating state of the refrigeration unit 100.

[0051] Furthermore, the refrigerated vehicle further includes a defrost unit 400, which includes an evaporator 202, a compressor 101, a defrost valve 401 and a first connecting pipe 402, wherein the first connecting pipe 402 is connected to the liquid outlet of the compressor 101 and the liquid inlet of the evaporator 202, and the defrost valve 401 is connected to the first connecting pipe 402. When the evaporator 202 needs to be defrosted, the defrost valve 401 is opened and the refrigeration valve 105 is closed, so that the high-temperature and high-pressure refrigerant gas flowing out of the compressor 101 flows into the core of the evaporator 202 through the first connecting pipe 402, thereby achieving defrosting of the core of the evaporator 202. When defrosting is completed, the defrost valve 401 is closed and the refrigeration valve 105 is opened to continue the refrigeration operation.

[0052] In this embodiment, the liquid outlet of the second separator 104 is connected to two branches, one branch is provided with a refrigeration valve 105 and is connected to the condenser 102, and the other branch is provided with a defrost valve 401 and is connected to the evaporator 202. Preferably, the defrost unit 400 is integrated in the refrigeration unit 100 to save space and reduce manufacturing costs.

[0053] Optionally, the defrost unit 400 further includes a second connecting pipe 403, one end of which is connected to the first connecting pipe 402, and the other end of which is connected to the outlet of the check valve 112, so as to recover the excess refrigerant in the first connecting pipe 402 and avoid waste caused by residual refrigerant in the first connecting pipe 402. Preferably, a one-way valve 404 is also provided on the second connecting pipe 403 to prevent the refrigerant from flowing back.

[0054] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A refrigerated vehicle, characterized in that: include: A chassis (1) and a refrigerated compartment (2), wherein the refrigerated compartment (2) is located above the chassis (1), and the refrigerated compartment (2) is capable of abutting against and moving away from the chassis (1) in a height direction; A refrigeration unit (100), the refrigeration unit (100) being installed below the chassis (1), the refrigeration unit (100) comprising a compressor (101) and a condenser (102); A plurality of evaporator units (200), wherein the plurality of evaporator units (200) are all installed on the top of the refrigerated compartment (2), and the plurality of evaporator units (200) are evenly distributed in the length direction of the refrigerated compartment (2); the refrigeration unit (100) is connected to all the evaporator units (200) via a pipeline system (300); the evaporator unit (200) comprises an expansion valve (201) and an evaporator (202); the compressor (101), the condenser (102), the expansion valve (201) and the evaporator (202) are connected in a circular manner in sequence.

2. The refrigerated vehicle according to claim 1, characterized in that: The refrigerated truck also includes a defrost unit (400), the defrost unit (400) includes a defrost valve (401) and a first connecting pipe (402), the first connecting pipe (402) is connected to the liquid outlet of the compressor (101) and the liquid inlet of the evaporator (202), and the defrost valve (401) is connected to the first connecting pipe (402).

3. The refrigerated vehicle according to claim 1, characterized in that: The refrigeration unit (100) further comprises a first separator (103), wherein the first separator (103) is connected between the compressor (101) and the evaporator (202).

4. The refrigerated vehicle according to claim 1, characterized in that: The refrigeration unit (100) further comprises a second separator (104), wherein the second separator (104) is connected between the compressor (101) and the condenser (102).

5. The refrigerated vehicle according to claim 4, characterized in that: The refrigeration unit (100) further comprises a refrigeration valve (105), wherein the refrigeration valve (105) is arranged on a pipeline connecting the second separator (104) and the condenser (102).

6. The refrigerated vehicle according to claim 1, characterized in that: The refrigeration unit (100) further comprises a first fan (106), wherein the first fan (106) is arranged toward the condenser (102).

7. The refrigerated vehicle according to claim 1, characterized in that: The refrigeration unit (100) further comprises a liquid storage device (107), wherein the liquid storage device (107) is connected between the condenser (102) and the expansion valve (201).

8. The refrigerated vehicle according to claim 1, characterized in that: The refrigeration unit (100) further comprises a filtering device (108), wherein the filtering device (108) is connected between the condenser (102) and the expansion valve (201).

9. The refrigerated vehicle according to claim 8, characterized in that: The filtering device (108) further comprises a sight glass.

10. The refrigerated vehicle according to claim 1, characterized in that: The evaporator unit (200) further comprises a second fan (203), wherein the second fan (203) is arranged toward the evaporator (202).

Images