A refrigeration device that enables dual-temperature cold storage in refrigerated trucks.

Abstract

A refrigeration device capable of achieving dual-temperature cold storage in refrigerated trucks includes several refrigerated cold storage plates and several frozen cold storage plates, a first liquid supply line and a second liquid supply line connected in parallel to the refrigerant outlet of the refrigeration unit of the refrigeration truck, and a first return line and a second return line connected in parallel to the refrigerant inlet of the refrigeration unit of the refrigeration truck. The first liquid supply line is equipped with a first valve and a refrigerated expansion valve, and the refrigerant outlet of the first liquid supply line is connected in parallel to the refrigerant inlet of each refrigerated cold storage plate. The second liquid supply line is equipped with a second valve and a frozen expansion valve, and the refrigerant outlet of the second liquid supply line is connected in parallel to the refrigerant inlet of each frozen cold storage plate. The refrigerant inlet of the first return line is connected in parallel to the refrigerant outlet of each refrigerated cold storage plate, and the refrigerant inlet of the second return line is connected in parallel to the refrigerant outlet of each frozen cold storage plate. This invention features low cost, light load capacity, and good cold storage effect.

Description

Technical Field

[0001] This utility model relates to the field of cold storage refrigerated vehicle technology, specifically, to a refrigeration device that can realize dual-temperature cold storage in cold storage refrigerated vehicles. Background Technology

[0002] A refrigerated truck with cold storage is a special vehicle used for cold chain transportation of goods, and its cold storage equipment includes components such as cold storage plates.

[0003] Traditional cold storage equipment consists of only one cold storage plate, which can usually only be filled with one type of cold storage agent to achieve the purpose of cold storage within a certain temperature range.

[0004] Traditional cold storage equipment can only achieve one target cold storage temperature, meaning a single refrigerated truck can only transport goods within a single temperature range. This means that transporting refrigerated goods cannot also transport frozen goods, as the cold storage temperature cannot reach the freezing standard; similarly, very low cold storage temperatures cannot transport refrigerated goods. If these problems are not addressed, it may lead to vehicle idleness, resource waste, uneven distribution of transport capacity, low transport efficiency, and an inability to improve economic benefits.

[0005] Chinese invention patent CN202110924406.9 discloses a portable phase change refrigerator capable of achieving a single-zone dual-cold storage mode, comprising: multi-stage freezing cold storage plates and a first heat exchange pipe connecting the multi-stage freezing cold storage plates; multi-stage refrigeration cold storage plates and a second heat exchange pipe connecting the multi-stage refrigeration cold storage plates; a first inlet connector and a first outlet connector connected to the first heat exchange pipe; a second inlet connector and a second outlet connector connected to the second heat exchange pipe; and a rapid charging device externally connected to the first inlet connector, the first outlet connector, the second inlet connector, and the second outlet connector to charge the freezing cold storage plates and refrigeration cold storage plates at each stage. This invention enables switching between refrigeration and freezing modes within the same phase change refrigerator according to actual needs, improving the space utilization and flexibility of the phase change refrigerator. However, the aforementioned patent requires the use of two different refrigerants, which necessitates the inclusion of two compression refrigeration systems in the rapid charging device. This increases equipment costs, inevitably occupies more vehicle space, increases load, and consequently affects the refrigerated truck's range. Furthermore, the refrigerant flow paths of the multi-stage refrigeration and cold storage plates are connected in series. Therefore, when the rapid charging device charges the refrigeration and cold storage plates at each stage, the refrigerant must flow sequentially through each stage of the refrigeration and cold storage plates. This results in the earlier stages of the refrigeration and cold storage plates reaching the target temperature quickly, while the later stages reach the target temperature relatively slowly, leading to poor cold storage performance. Utility Model Content

[0006] The purpose of this invention is to address the shortcomings of existing technologies by providing a refrigeration device that enables dual-temperature cold storage in refrigerated trucks. This invention requires only one compression refrigeration system to achieve both refrigeration and freezing cold storage modes. It features low equipment cost, small footprint, low load capacity, effectively ensures the refrigerated truck's range, provides excellent cold storage performance, and simplifies mode switching.

[0007] To achieve the above objectives, the technical solution adopted by this utility model is as follows: a refrigeration device capable of realizing dual-temperature cold storage in a refrigerated truck, comprising several refrigerated cold storage plates and several frozen cold storage plates installed in the cargo compartment of the refrigerated truck, a first liquid supply pipeline and a second liquid supply pipeline connected in parallel with the refrigerant outlet of the refrigeration unit of the refrigeration truck, and a first return pipeline and a second return pipeline connected in parallel with the refrigerant inlet of the refrigeration unit of the refrigeration truck; a first valve and a refrigeration expansion valve are sequentially arranged along the fluid flow direction on the first liquid supply pipeline, the first valve being used to control the on / off state of the first liquid supply pipeline, the evaporation temperature of the refrigeration expansion valve being lower than the target cold storage temperature of the refrigerated cold storage plates, and the refrigerant outlet of the first liquid supply pipeline being connected in parallel with the refrigerant inlet of each refrigerated cold storage plate; the second liquid supply pipeline is arranged along the fluid flow direction... The moving part is sequentially equipped with a second valve and a refrigeration expansion valve. The second valve is used to control the opening and closing of the second liquid supply line. The evaporation temperature of the refrigeration expansion valve is lower than the target refrigeration storage temperature of the refrigeration storage plate. The refrigerant outlet of the second liquid supply line is connected in parallel with the refrigerant inlet of each refrigeration storage plate. The refrigerant inlet of the first return line is connected in parallel with the refrigerant outlet of each refrigeration storage plate, and the refrigerant inlet of the second return line is connected in parallel with the refrigerant outlet of each refrigeration storage plate. Commonly, the target refrigeration storage temperature of the refrigeration storage plate is 0℃~5℃, that is, the refrigeration storage plate is filled with a refrigerant with a phase change temperature of 0℃~5℃, while the target refrigeration storage temperature of the refrigeration storage plate is below -18℃, that is, the refrigeration storage plate is filled with a refrigerant with a phase change temperature below -18℃.

[0008] Beneficial effects: This utility model designs two independent cold storage plate systems: several refrigerated cold storage plates and several frozen cold storage plates. The refrigerant flow path of each refrigerated cold storage plate is connected to the refrigeration unit of the refrigerated truck in parallel via a first liquid supply line and a first return line. The refrigerant flow path of each frozen cold storage plate is connected to the refrigeration unit of the refrigerated truck in parallel via a second liquid supply line and a second return line. The first and second liquid supply lines are connected in parallel to achieve refrigerant diversion from the refrigeration unit of the refrigeration truck. The first liquid supply line is controlled by a first valve. When the refrigerant expands through the expansion valve on the first liquid supply line, its temperature drops to the evaporation temperature of the expansion valve, meeting the temperature range required for refrigeration mode. Then, it simultaneously enters the refrigerant flow path of each refrigeration storage plate, causing the refrigerant within each plate to crystallize and quickly reach the target refrigeration storage temperature. The refrigerant then flows out from the refrigerant outlet of each plate and returns to the refrigeration unit of the refrigerated truck through the first return line. Similarly, the second liquid supply line is controlled by the second valve, and the refrigerant flows through the second liquid supply line... After the expansion valve expands, the refrigerant temperature drops to the evaporation temperature of the expansion valve, meeting the temperature range required for refrigeration mode. Then, it simultaneously enters the refrigerant flow path of each refrigeration storage plate, causing the refrigerant within each plate to crystallize and quickly reach the target refrigeration storage temperature. The refrigerant then flows out from the refrigerant outlet of each plate and returns to the refrigeration unit of the refrigerated truck through the second return pipe. Thus, this invention requires only one compression refrigeration system to achieve both refrigeration and freezing storage modes, resulting in low equipment cost and avoiding the need for additional equipment. The vehicle has a large interior space, reducing load and ensuring the refrigerated truck's driving range. Furthermore, the switching between refrigeration and freezing cold storage modes can be easily achieved by controlling the on / off state of the first and second valves. Since the refrigerant flow paths of each refrigeration and freezing cold storage plate are connected in parallel, refrigerant can simultaneously and rapidly enter and exit the refrigerant flow paths of each refrigeration or freezing cold storage plate, allowing each plate to reach the target cold storage temperature synchronously and quickly, resulting in excellent cold storage performance.

[0009] Based on the above, a third valve is installed on both the first and second return lines to prevent refrigerant from flowing in reverse.

[0010] Beneficial effect: The third valve is designed to prevent refrigerant flowing out of the refrigeration cold storage plate from flowing back into the freezing cold storage plate, or vice versa.

[0011] Based on the above, the refrigerated cold storage plates and the frozen cold storage plates are arranged alternately.

[0012] Beneficial effects: The staggered arrangement of refrigerated and frozen cold storage plates ensures that the cold storage areas are consistent and overlap in space, improving space utilization and avoiding reducing the storage space for goods. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model.

[0014] In the diagram: 1. Refrigerated cold storage plate; 2. Frozen cold storage plate; 3. Main liquid supply line; 4. T-junction; 5. First liquid supply line; 6. Second liquid supply line; 7. First valve; 8. Refrigerated expansion valve; 9. First distributor pipe; 10. Second valve; 11. Frozen expansion valve; 12. Second distributor pipe; 13. First reflux line; 14. Second reflux line; 15. First reflux branch pipe; 16. Second reflux branch pipe; 17. Third valve. Detailed Implementation

[0015] The technical solution of this utility model will be further described in detail below through specific embodiments.

[0016] like Figure 1 As shown, a refrigeration device that can realize dual-temperature cold storage in refrigerated trucks includes several refrigerated cold storage plates 1, several frozen cold storage plates 2, a main liquid supply pipeline 3, a first liquid supply pipeline 5, a second liquid supply pipeline 6, a first return pipeline 13, and a second return pipeline 14. The refrigerated cold storage plate 1 and the frozen cold storage plate 2 are installed alternately in the cargo compartment of the refrigerated truck, which can ensure that the cold storage areas are consistent and overlap in space, improve space utilization, and avoid reducing the cargo storage space. The refrigerant inlet of the main liquid supply line 3 is connected to the refrigerant outlet of the refrigeration unit of the refrigeration truck. The refrigerant outlet of the main liquid supply line 3 is connected in parallel with the refrigerant inlets of the first liquid supply line 5 and the second liquid supply line 6 via a tee 4. A first valve 7 and a refrigeration expansion valve 8 are sequentially installed on the first liquid supply line 5 along the fluid flow direction. The first valve 7 controls the opening and closing of the first liquid supply line 5. The evaporation temperature of the refrigeration expansion valve 8 is lower than the target refrigeration temperature of the refrigeration storage plate. The refrigerant outlet of the first liquid supply line 5 is connected in parallel with the refrigerant inlets of each refrigeration storage plate 1 via a first distributor pipe 9. A second valve 10 and a freezing expansion valve 11 are sequentially installed on the second liquid supply line 6 along the fluid flow direction. The second valve 10 controls the opening and closing of the second liquid supply line 6. The evaporation temperature of the expansion valve 11 is lower than the target temperature for refrigeration storage of the cold storage plate. The refrigerant outlet of the second liquid supply line 6 is connected in parallel with the refrigerant inlet of each cold storage plate 2 through the second liquid distribution pipe 12. The refrigerant outlets of the first return line 13 and the second return line 14 are connected in parallel with the refrigerant inlet of the refrigeration unit of the refrigeration vehicle. The refrigerant inlet of the first return line 13 is connected in parallel with the refrigerant outlet of each cold storage plate 1 through the first return branch pipe 15. The refrigerant inlet of the second return line 14 is connected in parallel with the refrigerant outlet of each cold storage plate 2 through the second return branch pipe 16. Each cold storage plate 1 constitutes one cold storage plate system, and each cold storage plate 2 constitutes another cold storage plate system. The two cold storage plate systems operate independently of each other. Both the first return line 13 and the second return line 14 are equipped with a third valve 17 to prevent refrigerant from flowing back. The third valve 17 is designed to prevent refrigerant flowing out of the refrigeration cold storage plate 1 from flowing back to the freezing cold storage plate 2, or refrigerant flowing out of the freezing cold storage plate 2 from flowing back to the refrigeration cold storage plate 1, thus ensuring that the two cold storage plate systems are independent.

[0017] In this embodiment, the first valve 7 and the second valve 10 are both shut-off valves, or other valves with the same function as shut-off valves can be used; the third valve 17 is a check valve, or a shut-off valve can be used to control the opening and closing of the first return pipeline 13 or the second return pipeline 14 to achieve the purpose.

[0018] Commonly, the target temperature for refrigerated cold storage plates is 0℃~5℃, meaning that the refrigerated cold storage plates are filled with a refrigerant with a phase change temperature of 0℃~5℃, while the target temperature for frozen cold storage plates is below -18℃, meaning that the frozen cold storage plates are filled with a refrigerant with a phase change temperature below -18℃.

[0019] In this embodiment, the target temperature for cold storage of the cold storage plate 1 is set to 0°C, and the target temperature for cold storage of the frozen plate 2 is set to -18°C.

[0020] The specific working principle of this utility model is as follows: When the refrigeration unit of the refrigeration truck is turned on, the refrigeration system begins to circulate. The tee 4 on the main liquid supply line 3 divides the refrigerant pumped out by the refrigeration unit of the refrigeration truck into two paths. When transporting refrigerated goods, the first valve 7 is opened, and the refrigerant expands through the refrigeration expansion valve 8 on the first liquid supply line 5 and then enters the refrigerant flow path of each refrigeration cold storage plate 1 through the first liquid distribution pipe 9. At this time, the refrigerant temperature drops to the evaporation temperature of the refrigeration expansion valve 8, and the refrigerant exchanges heat with the cold storage agent in each refrigeration cold storage plate 1, causing the cold storage agent in each refrigeration cold storage plate 1 to crystallize, quickly reaching the target refrigeration cold storage temperature. The refrigerant then flows out from the refrigerant outlet of each refrigeration cold storage plate 1 and is collected through the first return branch pipe 15 to the first The refrigerant flows back to the refrigeration unit of the refrigerated truck through the first return pipe 13. Similarly, when transporting frozen goods, the second valve 10 is opened, and the refrigerant expands through the refrigeration expansion valve 11 on the second liquid supply pipe 6 and then enters the refrigerant flow path of each refrigeration storage plate 2 through the second liquid distribution pipe. At this time, the refrigerant temperature drops to the evaporation temperature of the refrigeration expansion valve 11. The refrigerant exchanges heat with the cold storage agent in each refrigeration storage plate 2, causing the cold storage agent in each refrigeration storage plate 2 to crystallize and quickly reach the target temperature for refrigeration storage. The refrigerant then flows out from the refrigerant outlet of each refrigeration storage plate 2 and is collected in the second return branch pipe 16 to the second return pipe 14, and then flows back to the refrigeration unit of the refrigerated truck through the second return pipe 14.

[0021] This invention enables a single refrigerated truck to transport both refrigerated and frozen goods, solving the problem that refrigerated trucks on the market can only store cold at a single temperature. This maximizes vehicle utilization, saves resources, and increases transport capacity.

[0022] Thus, this utility model only requires one compression refrigeration system to achieve both refrigeration and freezing cold storage modes, resulting in low equipment cost, avoiding the occupation of a large space in the vehicle, reducing load, and ensuring the driving range of the refrigerated truck. Moreover, the refrigeration and freezing cold storage modes can be switched at any time by controlling the opening and closing of the first valve 7 and the second valve 10, making mode switching simple. Since the refrigerant flow paths of each refrigeration cold storage plate 1 and each freezing cold storage plate 2 are connected in parallel, the refrigerant can simultaneously and quickly enter and exit the refrigerant flow paths of each refrigeration cold storage plate 1 or each freezing cold storage plate 2, so that each refrigeration cold storage plate 1 or each freezing cold storage plate 2 can reach the target cold storage temperature synchronously and quickly, resulting in good cold storage effect.

[0023] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of this utility model and not to limit it; although the utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of this utility model or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solution of this utility model, and all such modifications and substitutions should be covered within the scope of the technical solution claimed by this utility model.

Claims

1. A refrigeration device capable of achieving dual-temperature cold storage in refrigerated trucks, characterized in that: This includes several refrigerated cold storage plates and several frozen cold storage plates installed inside the refrigerated truck's cargo compartment; a first liquid supply line and a second liquid supply line connected in parallel to the refrigerant outlet of the refrigeration unit of the refrigeration truck; and a first return line and a second return line connected in parallel to the refrigerant inlet of the refrigeration unit of the refrigeration truck. A first valve and a refrigerated expansion valve are sequentially installed along the fluid flow direction on the first liquid supply line. The first valve controls the on / off state of the first liquid supply line. The evaporation temperature of the refrigerated expansion valve is lower than the target refrigeration temperature of the refrigerated cold storage plates. The refrigerant outlet of the first liquid supply line is connected to each of the following: The refrigerant inlets of the cold storage plates are connected in parallel; a second valve and a refrigeration expansion valve are sequentially installed along the fluid flow direction on the second liquid supply line. The second valve is used to control the opening and closing of the second liquid supply line. The evaporation temperature of the refrigeration expansion valve is lower than the target refrigeration storage temperature of the cold storage plate. The refrigerant outlet of the second liquid supply line is connected in parallel with the refrigerant inlet of each cold storage plate. The refrigerant inlet of the first return line is connected in parallel with the refrigerant outlet of each cold storage plate, and the refrigerant inlet of the second return line is connected in parallel with the refrigerant outlet of each cold storage plate.

2. The refrigeration device for realizing dual-temperature cold storage in refrigerated trucks according to claim 1, characterized in that: Both the first and second return lines are equipped with a third valve to prevent refrigerant from flowing backward.

3. The refrigeration device for realizing dual-temperature cold storage in refrigerated trucks according to claim 1 or 2, characterized in that: Refrigerated cold storage plates and frozen cold storage plates are arranged alternately.

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