Double-loop agricultural machinery thermal management system and electric agricultural machinery

Abstract

The invention discloses a double-loop agricultural machine heat management system and an electric agricultural machine, which comprises a compression branch, a refrigeration branch, a first heat exchange branch, a battery pack heat management loop, a second heat exchange branch, a medium conveying branch, a third heat exchange branch, an air blower, a first connecting branch, a second connecting branch, a third connecting branch and a reversing valve, the first connecting branch is connected with the backflow end of the compression branch and the first heat exchange branch, the second connecting branch is connected with the first heat exchange branch and the second heat exchange branch, the third connecting branch is connected with the first heat exchange branch and the medium conveying branch, and the cab and the battery pack share one set of heat management system. Three operation conditions of battery pack cooling during cab heating, simultaneous cooling of the cab and the battery pack, and cab heating and battery pack preheating are realized, the heat exchange efficiency is high, the structure is simple, the battery pack works normally, the energy consumption is low, and lasting operation of the electric agricultural machinery is facilitated.

Description

Technical Field

[0001] This invention relates to the field of agricultural machinery technology, and in particular, to a dual-circuit agricultural machinery thermal management system. Furthermore, this invention also relates to an electric agricultural machine comprising the aforementioned dual-circuit agricultural machinery thermal management system. Background Technology

[0002] With the increasing adoption of electrification in agricultural machinery, the demand for efficient heat dissipation for the entire machine is becoming more and more urgent. As the main energy-consuming components of electric agricultural machinery, the thermal management solutions for power batteries and air conditioning systems are particularly important for improving the overall energy consumption distribution and operational reliability of the machine.

[0003] In existing electric agricultural machinery, the thermal management of the air conditioning system and the battery pack is usually relatively independent, resulting in low integration of the overall vehicle thermal management system, low heat exchange efficiency, and complex structure. In some electric agricultural machinery, when the air conditioning system and battery pack are coupled, it is impossible to cool the battery pack when the air conditioning system is heating, leading to excessively high battery pack temperatures and malfunction. If a PTC plate is used to preheat the battery pack, the energy consumption is high, which is not conducive to the sustained operation of the electric agricultural machinery. Summary of the Invention

[0004] This invention provides a dual-loop agricultural machinery thermal management system and electric agricultural machinery to solve the technical problems of low integration, low heat exchange efficiency, complex structure, or inability to achieve battery cooling when the air conditioning system is heating in existing electric agricultural machinery, and high energy consumption for battery pack preheating.

[0005] According to one aspect of the present invention, a dual-loop agricultural machinery thermal management system is provided, comprising a compression branch, a refrigeration branch, a first heat exchange branch, a battery pack thermal management circuit, a second heat exchange branch, a media conveying branch, a third heat exchange branch, a blower, a first connecting branch, a second connecting branch, a third connecting branch, and a reversing valve. The compression branch is used to compress and drive the refrigerant flow. The refrigeration branch is connected to both the compression branch and the first heat exchange branch and is used for refrigerant condensation and controlling whether the refrigerant flows through the refrigeration branch to the first heat exchange branch. The first heat exchange branch is used to exchange heat between the refrigerant and the coolant in the battery pack thermal management circuit. The battery pack thermal management circuit is used to drive the coolant to circulate for cooling or preheating the battery pack. The second heat exchange branch is used for refrigerant evaporation or condensation. The media conveying branch is connected to the third heat exchange branch and is used for refrigerant transport. The third heat exchange branch is used to exchange heat between the refrigerant and the air surrounding the blower. The blower is used to deliver cold or hot air to the cab. The first connecting branch is connected to the return end of the compression branch and the first heat exchange branch respectively, and is used to control whether the return end of the compression branch and the first heat exchange branch are connected. The second connecting branch is connected to the first heat exchange branch and the second heat exchange branch respectively, and is used to control whether the first heat exchange branch and the second heat exchange branch are connected. The third connecting branch is connected to the first heat exchange branch and the media conveying branch respectively, and is used to control whether the first heat exchange branch and the second heat exchange branch are connected. The reversing valve is connected to the output end of the compression branch, the return end of the compression branch, the second heat exchange branch and the media conveying branch respectively, and is used to control the direction of refrigerant flow so that the conveying end of the compression branch is connected to the second heat exchange branch and the return end of the compression branch is connected to the media conveying branch, or the conveying end of the compression branch is connected to the media conveying branch and the return end of the compression branch is connected to the second heat exchange branch.

[0006] As a further improvement to the above technical solution:

[0007] Furthermore, the first heat exchange branch includes a heat exchange branch pipe connected to the refrigeration branch, the first connecting branch, the second connecting branch and the third connecting branch respectively, and an expansion valve, a heat exchanger and a solenoid valve arranged sequentially on the heat exchange branch pipe. The heat exchange end of the heat exchanger is connected to the battery pack thermal management circuit.

[0008] Furthermore, the battery pack thermal management circuit includes a circulation pipeline connected to the heat exchange end of heat exchanger one, an expansion tank connected to the circulation pipeline, and a circulation pump and a battery pack water jacket arranged sequentially on the circulation pipeline.

[0009] Furthermore, the third heat exchange branch includes a heat exchange branch pipe three connected to the second heat exchange branch and the media transmission branch respectively, and an expansion valve two, a heat exchanger two and a solenoid valve two arranged sequentially on the heat exchange branch pipe three. The heat exchanger two is used to exchange heat with the air around the blower.

[0010] Furthermore, the refrigeration branch includes a refrigeration branch pipe connected to the compression branch and the first heat exchange branch respectively, a solenoid valve three installed on the refrigeration branch pipe, and a heat exchanger three installed on the refrigeration branch pipe.

[0011] Furthermore, the second heat exchange branch includes a second heat exchange branch pipe connected to the reversing valve, the first connecting branch, and the third heat exchange branch, respectively, and a fourth heat exchanger arranged on the second heat exchange branch pipe.

[0012] Furthermore, the compression branch includes a compression branch pipe, a compressor installed on the compression branch pipe, and a gas-liquid separator installed on the compression branch pipe.

[0013] Furthermore, the first connecting branch includes a connecting branch pipe 1 connected to the return end of the compression branch and the first heat exchange branch respectively, and a solenoid valve 4 installed on the connecting branch pipe 1; and / or the second connecting branch includes a connecting branch pipe 2 connected to the first heat exchange branch and the second heat exchange branch respectively, and a solenoid valve 5 installed on the connecting branch pipe 2; and / or the third connecting branch includes a connecting branch pipe 3 connected to the first heat exchange branch and the media conveying branch respectively, and a solenoid valve 6 installed on the connecting branch pipe 3.

[0014] Furthermore, the media transmission branch includes a media transmission branch pipe connected to the reversing valve, the third connecting branch, and the third heat exchange branch, respectively, as well as a solenoid valve seven installed on the media transmission branch pipe.

[0015] According to another aspect of the present invention, an electric agricultural machine is also provided, which includes the above-described dual-circuit agricultural machinery thermal management system.

[0016] The present invention has the following beneficial effects:

[0017] The dual-loop agricultural machinery thermal management system of the present invention has the following characteristics under various operating conditions: When the cab needs heating and the battery pack needs cooling, the first connecting branch controls the return end of the compression branch to connect with the first heat exchange branch; the second connecting branch controls the first heat exchange branch and the second heat exchange branch to disconnect; and the third connecting branch controls the first heat exchange branch and the second heat exchange branch to disconnect. A reversing valve connects the delivery end of the compression branch with the media delivery branch, and the return end of the compression branch with the second heat exchange branch. The compression branch compresses and drives the refrigerant to flow, with a portion of the refrigerant circulating along the delivery end of the compression branch, the refrigeration branch, the first heat exchange branch, the first connecting branch, and the return end of the compression branch. The system operates by condensing and cooling the refrigerant in the refrigeration branch, then exchanging heat with the coolant in the battery pack thermal management circuit via the first heat exchange branch. This drives the coolant circulation through the battery pack thermal management circuit to cool the battery pack. Other refrigerant circulates along the delivery end of the compression branch, the reversing valve, the refrigerant delivery branch, the third heat exchange branch, the second heat exchange branch, the reversing valve, and the return end of the compression branch. It exchanges heat with the air around the blower via the third heat exchange branch, thus delivering hot air to the cab via the blower to heat the cab. The refrigerant condenses and cools in the second heat exchange branch, achieving refrigerant recycling. When operating conditions require simultaneous cooling of both the cab and the battery pack... The first connecting branch controls the return end of the compression branch to be disconnected from the first heat exchange branch. The second connecting branch controls the first and second heat exchange branches to be connected. The third connecting branch controls the first and second heat exchange branches to be connected. The reversing valve connects the delivery end of the compression branch to the media supply branch, and the return end of the compression branch to the second heat exchange branch. The compression branch compresses and drives the refrigerant to flow. The refrigerant flows along the delivery end of the compression branch, sequentially through the reversing valve and the second heat exchange branch. Part of the refrigerant is then transported through the second connecting branch to the first heat exchange branch to exchange heat with the battery pack thermal management circuit to achieve battery pack cooling. The refrigerant is then transported back to the compression branch through the third connecting branch, the media supply branch, and the reversing valve. At the return end, other refrigerant flows into the third heat exchange branch to exchange heat with the air around the blower. The blower then delivers cold air to the cab to cool the cab. The refrigerant is then transported to the return end of the compression branch through the media supply branch and the reversing valve to achieve refrigerant recycling. When the cab needs heating and the battery pack needs preheating, the first connecting branch controls the return end of the compression branch to be disconnected from the first heat exchange branch. The second connecting branch controls the first heat exchange branch and the second heat exchange branch to be connected. The third connecting branch controls the first heat exchange branch and the second heat exchange branch to be connected. The reversing valve connects the delivery end of the compression branch to the media supply branch and the return end of the compression branch to the second heat exchange branch.The compression branch compresses and drives the refrigerant flow. The refrigerant flows sequentially through the reversing valve and the refrigerant supply branch at the delivery end of the compression branch. Part of the refrigerant is then transported to the first heat exchange branch via the third connecting branch, where it exchanges heat with the battery pack thermal management circuit to preheat the battery pack. The refrigerant is then transported to the return end of the compression branch via the second connecting branch, the second heat exchange branch, and the reversing valve. The remaining refrigerant flows into the third heat exchange branch to exchange heat with the air around the blower. The blower then delivers hot air to the cab, achieving cab heating. The refrigerant is then transported back to the return end of the compression branch via the second heat exchange branch and the reversing valve, achieving refrigerant recycling. Compared to existing technologies, this solution allows the cab and battery pack to share a single thermal management system, enabling three operating conditions: cab heating with battery pack cooling, simultaneous cab and battery pack cooling, and cab heating with battery pack preheating. It features high heat exchange efficiency, a simple structure, normal battery pack operation, and low energy consumption, which is beneficial for the long-term operation of electric agricultural machinery. It is highly practical and suitable for widespread promotion and application. ;

[0018] In addition to the objectives, features, and advantages described above, the present invention has other objectives, features, and advantages. The invention will now be described in further detail with reference to the figures. Attached Figure Description

[0019] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings:

[0020] Figure 1 This is a schematic diagram of the structure of a dual-loop agricultural machinery thermal management system according to a preferred embodiment of the present invention;

[0021] Figure 2 This is a partial structural schematic diagram of the dual-loop agricultural machinery thermal management system according to a preferred embodiment of the present invention;

[0022] Figure 3 This is a partial structural schematic diagram of the dual-loop agricultural machinery thermal management system according to a preferred embodiment of the present invention.

[0023] Legend:

[0024] 11. Blower; 12. Reversing valve; 13. Heat exchanger four; 14. Solenoid valve four; 15. Solenoid valve five; 16. Solenoid valve six; 17. Solenoid valve seven; 21. Expansion valve one; 22. Heat exchanger one; 23. Solenoid valve one; 31. Expansion tank; 32. Circulating water pump; 33. Battery pack water jacket; 41. Expansion valve two; 42. Heat exchanger two; 43. Solenoid valve two; 51. Solenoid valve three; 52. Heat exchanger three; 61. Compressor; 62. Gas-liquid separator. Detailed Implementation

[0025] The embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, the present invention can be implemented in many different ways as defined and covered below.

[0026] like Figure 1 As shown, the dual-loop agricultural machinery thermal management system of this embodiment includes a compression branch, a refrigeration branch, a first heat exchange branch, a battery pack thermal management circuit, a second heat exchange branch, a media conveying branch, a third heat exchange branch, a blower 11, a first connecting branch, a second connecting branch, a third connecting branch, and a reversing valve 12. The compression branch is used to compress and drive the refrigerant flow. The refrigeration branch is connected to the compression branch and the first heat exchange branch respectively and is used for refrigerant condensation and controlling whether the refrigerant flows to the first heat exchange branch via the refrigeration branch. The first heat exchange branch is used to exchange heat between the refrigerant and the coolant in the battery pack thermal management circuit. The battery pack thermal management circuit is used to drive the coolant to circulate to cool or preheat the battery pack. The second heat exchange branch is used for refrigerant evaporation or condensation. The media conveying branch is connected to the third heat exchange branch and is used for refrigerant transport. The third heat exchange branch is used to exchange heat between the refrigerant and the air around the blower 11. The machine 11 is used to supply cold or hot air to the cab. The first connecting branch is connected to the return end of the compression branch and the first heat exchange branch respectively, and is used to control whether the return end of the compression branch and the first heat exchange branch are connected. The second connecting branch is connected to the first heat exchange branch and the second heat exchange branch respectively, and is used to control whether the first heat exchange branch and the second heat exchange branch are connected. The third connecting branch is connected to the first heat exchange branch and the media conveying branch respectively, and is used to control whether the first heat exchange branch and the second heat exchange branch are connected. The reversing valve 12 is connected to the output end of the compression branch, the return end of the compression branch, the second heat exchange branch and the media conveying branch respectively, and is used to control the direction of refrigerant flow so that the conveying end of the compression branch is connected to the second heat exchange branch and the return end of the compression branch is connected to the media conveying branch, or the conveying end of the compression branch is connected to the media conveying branch and the return end of the compression branch is connected to the second heat exchange branch.

[0027] like Figure 2As shown, the dual-loop agricultural machinery thermal management system of the present invention has the following operating conditions: When the cab needs heating and the battery pack needs cooling, the first connecting branch controls the return end of the compression branch to be connected to the first heat exchange branch; the second connecting branch controls the first heat exchange branch and the second heat exchange branch to be disconnected; the third connecting branch controls the first heat exchange branch and the second heat exchange branch to be disconnected; the reversing valve 12 connects the delivery end of the compression branch to the media delivery branch, and the return end of the compression branch to the second heat exchange branch; the compression branch compresses and drives the refrigerant to flow, wherein a portion of the refrigerant flows along the delivery end of the compression branch, the refrigeration branch, the first heat exchange branch, the first connecting branch, and the compression branch. The refrigerant circulates at the return end of the compression branch so that after the refrigerant condenses and cools down in the refrigeration branch, it exchanges heat with the coolant in the battery pack thermal management circuit through the first heat exchange branch, thereby driving the coolant to circulate through the battery pack thermal management circuit to cool the battery pack. Other refrigerants circulate along the delivery end of the compression branch, the reversing valve 12, the refrigerant delivery branch, the third heat exchange branch, the second heat exchange branch, the reversing valve 12, and the return end of the compression branch, so that they exchange heat with the air around the blower 11 through the third heat exchange branch, thereby delivering hot air to the cab through the blower 11 to heat the cab. The refrigerant condenses and cools down in the second heat exchange branch, realizing the recycling of the refrigerant.

[0028] like Figure 3 As shown, when operating under conditions requiring simultaneous cooling of the cab and battery pack, the first connecting branch controls the return end of the compression branch to be disconnected from the first heat exchange branch; the second connecting branch controls the first and second heat exchange branches to be connected; and the third connecting branch controls the first and second heat exchange branches to be connected. The reversing valve 12 connects the delivery end of the compression branch to the media delivery branch, and the return end of the compression branch to the second heat exchange branch. The compression branch compresses and drives the refrigerant flow, and the refrigerant flows sequentially through the reversing valve along the delivery end of the compression branch. After the second heat exchange branch, part of the refrigerant is transported to the first heat exchange branch via the second connecting branch to exchange heat with the battery pack thermal management circuit to achieve battery pack cooling. The refrigerant is then transported to the return end of the compression branch via the third connecting branch, the refrigerant supply branch, and the reversing valve 12. The remaining refrigerant flows into the third heat exchange branch to exchange heat with the air around the blower 11. The blower 11 then delivers cold air to the cab to achieve cab cooling. The refrigerant is then transported to the return end of the compression branch via the refrigerant supply branch and the reversing valve 12 to achieve refrigerant recycling.

[0029] like Figure 3As shown, when the cab needs heating and the battery pack needs preheating, the first connecting branch controls the return end of the compression branch and the first heat exchange branch to be disconnected; the second connecting branch controls the first heat exchange branch and the second heat exchange branch to be connected; the third connecting branch controls the first heat exchange branch and the second heat exchange branch to be connected; the reversing valve 12 connects the delivery end of the compression branch to the media delivery branch, and the return end of the compression branch to the second heat exchange branch; the compression branch compresses and drives the refrigerant to flow, and the refrigerant flows sequentially through the reversing valve 12 along the delivery end of the compression branch. After the refrigerant is connected to the media supply branch, part of the refrigerant is transported to the first heat exchange branch via the third connecting branch to exchange heat with the battery pack thermal management circuit to preheat the battery pack. The refrigerant is then transported to the return end of the compression branch via the second connecting branch, the second heat exchange branch, and the reversing valve 12. The remaining refrigerant flows into the third heat exchange branch to exchange heat with the air around the blower 11. Hot air is then delivered to the cab via the blower 11 to heat the cab. The refrigerant is then transported to the return end of the compression branch via the second heat exchange branch and the reversing valve 12 to achieve the recycling of the refrigerant.

[0030] Compared with existing technologies, this solution uses a shared thermal management system for the cab and battery pack, and achieves three operating conditions: cooling the battery pack while the cab is heated, cooling both the cab and battery pack simultaneously, and preheating the battery pack while the cab is heated. It has high heat exchange efficiency, simple structure, normal battery pack operation, and low energy consumption, which is conducive to the long-term operation of electric agricultural machinery. It is highly practical and suitable for widespread promotion and application.

[0031] In this embodiment, the operating condition that requires heating of the cab and cooling of the battery pack is the first operating condition, the operating condition that requires cooling of both the cab and the battery pack is the second operating condition, and the operating condition that requires heating of the cab and preheating of the battery pack is the third operating condition.

[0032] like Figure 1-3As shown, in this embodiment, the first heat exchange branch includes a heat exchange branch pipe connected to the refrigeration branch, the first connecting branch, the second connecting branch, and the third connecting branch, respectively, and an expansion valve 21, a heat exchanger 22, and a solenoid valve 23 arranged sequentially on the heat exchange branch pipe. The heat exchange end of the heat exchanger 22 is connected to the battery pack thermal management circuit. Specifically, when the refrigerant enters the heat exchange branch pipe through the refrigeration branch and the second connecting branch, the refrigerant first flows through the expansion valve 21 and then through the heat exchanger 22, which allows the refrigerant to absorb heat and evaporate, thereby reducing the temperature of the coolant in the battery pack thermal management circuit and cooling the battery pack. The refrigerant flows into the return end of the compression branch through the solenoid valve 23 and the first connecting branch, or flows into the media transmission branch through the solenoid valve 23, the third connecting branch, the media transmission branch, and the reversing valve 12, thereby realizing the recycling of the refrigerant. When the refrigerant flows into the heat exchange branch pipe through the third connecting branch, the refrigerant flows sequentially through the expansion valve 21, the heat exchanger 22, and the solenoid valve 23. Solenoid valve 23 and heat exchanger 22 are used to cause the refrigerant to release heat and condense, thereby increasing the temperature of the coolant in the battery pack thermal management circuit and preheating the battery pack. The refrigerant flows through expansion valve 21 and then through the second connecting branch to the third heat exchange branch. The refrigerant can absorb heat from the outside and evaporate, and then flow into the return end of the compression branch through reversing valve 12. Solenoid valve 23 controls the refrigerant flow rate in heat exchange branch pipe 1 to control the opening and closing of heat exchange branch pipe 1, which can control whether thermal management of the battery pack is required. That is, by closing solenoid valve 23, the cab can be cooled or heated separately.

[0033] like Figure 1-3 As shown, in this embodiment, the battery pack thermal management circuit includes a circulation pipeline connected to the heat exchange end of heat exchanger 22, an expansion tank 31 connected to the circulation pipeline, and a circulation pump 32 and a battery pack water jacket 33 arranged sequentially on the circulation pipeline. Specifically, the circulation pump 32 drives the coolant to circulate in the circulation pipeline to exchange heat with the refrigerant in the heat exchange branch pipe, and then flows through the battery pack water jacket 33 to cool the battery pack or preheat it. The expansion tank 31 replenishes water, maintains pressure, and vents air from the circulation pipeline.

[0034] like Figure 1-3As shown, in this embodiment, the third heat exchange branch includes a heat exchange branch pipe three connected to the second heat exchange branch and the media transmission branch respectively, and an expansion valve two 41, a heat exchanger two 42, and a solenoid valve two 43 arranged sequentially on the heat exchange branch pipe three. The heat exchanger two 42 is used to exchange heat with the air around the blower 11. Specifically, when the refrigerant is cooled by the second heat exchange branch and flows into the heat exchange branch pipe three, the refrigerant first flows through the expansion valve two 41 and then through the heat exchanger two 42, which allows the refrigerant to absorb heat and evaporate, thereby reducing the temperature of the air in the area around the blower 11. This allows the blower 11 to deliver cold air to the cab. The refrigerant then flows into the return end of the compression branch through the solenoid valve two 43, the media transmission branch, and the reversing valve 12, realizing the recycling of the refrigerant. When the refrigerant flows into the heat exchange branch pipe three through the media transmission branch, the refrigerant flows sequentially through the solenoid valve two 43 and the heat exchanger two 42. The refrigerant releases heat and condenses, thereby increasing the temperature of the air around the blower 11, which allows the blower 11 to deliver hot air into the cab. When the refrigerant flows through the expansion valve 2 41 and then through the third heat exchange branch, it can absorb heat from the outside and evaporate. Then it flows into the return end of the compression branch through the reversing valve 12. The solenoid valve 2 43 controls the refrigerant flow rate in the heat exchange branch 3 to control the opening and closing of the heat exchange branch 3, which can control whether thermal management of the cab is required. That is, by closing the solenoid valve 2 43, the battery pack can also be cooled or preheated separately.

[0035] like Figure 2 As shown, in this embodiment, the refrigeration branch includes a refrigeration branch pipe connected to the delivery end of the compression branch and the first heat exchange branch, a solenoid valve 51 arranged on the refrigeration branch pipe, and a heat exchanger 52 arranged on the refrigeration branch pipe. Specifically, when in the first operating condition, the solenoid valve 51 is opened so that the refrigerant flowing out of the delivery end of the compression branch can flow into the refrigeration branch pipe, condense and release heat in the heat exchanger 52, and then flow into the first heat exchange branch to exchange heat with the battery pack thermal management circuit.

[0036] In this embodiment, heat exchanger 352 is an outdoor air-cooled radiator.

[0037] like Figure 3 As shown, in this embodiment, the second heat exchange branch includes a second heat exchange branch pipe connected to the reversing valve 12, the first connecting branch, and the third heat exchange branch, respectively, and a fourth heat exchanger 13 arranged on the second heat exchange branch pipe. Specifically, when in the second operating condition, the refrigerant flowing through the second heat exchange branch pipe is condensed through the fourth heat exchanger 13, so that the cab and the battery pack are cooled simultaneously when the refrigerant flows through the first and third heat exchange branches; when in the third operating condition, the refrigerant flowing through the second heat exchange branch pipe is evaporated and absorbs heat through the fourth heat exchanger 13, so that the cab is heated and the battery pack is preheated when the refrigerant flows through the first and third heat exchange branches.

[0038] In this embodiment, heat exchanger 413 is an outdoor air-cooled radiator.

[0039] like Figure 1-3 As shown, in this embodiment, the compression branch includes a compression branch pipe, a compressor 61 installed on the compression branch pipe, and a gas-liquid separator 62 installed on the compression branch pipe. Specifically, the compressor 61 compresses and delivers gaseous refrigerant, while the gas-liquid separator 62 is used to separate liquid refrigerant, ensuring that only gaseous refrigerant enters the compressor 61 and protecting the compressor 61 from damage by liquid refrigerant.

[0040] like Figure 1-3 As shown, in this embodiment, the first connecting branch includes a connecting branch pipe 1 connected to the return end of the compression branch and the first heat exchange branch respectively, and a solenoid valve 14 arranged on the connecting branch pipe 1. Specifically, the solenoid valve 14 controls the refrigerant flow rate in the connecting branch pipe 1 to control the opening and closing of the connecting branch pipe 1. Under the first operating condition, the solenoid valve 14 is open to realize the recycling of refrigerant; under other operating conditions, the solenoid valve 14 is closed.

[0041] like Figure 1-3 As shown, in this embodiment, the second connecting branch includes a connecting branch pipe 2 connected to the first heat exchange branch and the second heat exchange branch respectively, and a solenoid valve 5 15 arranged on the connecting branch pipe 2. Specifically, the solenoid valve 5 15 controls the refrigerant flow rate in the connecting branch pipe 2 to control the opening and closing of the connecting branch pipe 2. Under the second or third operating conditions, the solenoid valve 5 15 is open to realize the recycling of refrigerant, while under other operating conditions, the solenoid valve 5 15 is closed.

[0042] like Figure 1-3 As shown, in this embodiment, the third connecting branch includes a connecting branch pipe three connected to the first heat exchange branch and the media conveying branch respectively, and a solenoid valve six 16 arranged on the connecting branch pipe three. Specifically, the solenoid valve six 16 controls the refrigerant flow rate in the connecting branch pipe three to control the opening and closing of the connecting branch pipe three. Under the second or third operating conditions, the solenoid valve six 16 is open to realize the recycling of refrigerant, while under other operating conditions, the solenoid valve six 16 is closed.

[0043] like Figure 1-3 As shown, in this embodiment, the media transmission branch includes a media transmission branch pipe connected to the reversing valve 12, the third connecting branch, and the third heat exchange branch, respectively, and a solenoid valve 7 17 installed on the media transmission branch pipe. Specifically, the flow rate of refrigerant in the media transmission branch pipe is controlled by the solenoid valve 7 17 to control the on / off state of the media transmission branch pipe.

[0044] The electric agricultural machinery of this embodiment includes the aforementioned dual-loop agricultural machinery thermal management system. Specifically, by employing the highly integrated dual-loop agricultural machinery thermal management system in the electric agricultural machinery, heat exchange efficiency is improved, the structure is simplified, the battery pack can operate normally, energy consumption is reduced, and the range is increased. It is highly practical and suitable for widespread promotion and application.

[0045] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

[0046] The terms "first" and "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, not to describe a particular order.

[0047] It should be noted that, in this document, the terms “comprising,” “including,” or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0048] This document uses specific examples to illustrate the principles and implementation methods of this application. The examples are merely for the purpose of helping to understand the method and core ideas of this application. The above descriptions are only preferred embodiments of this application. It should be noted that due to the limitations of written expression, and the existence of an infinite number of specific structures, those skilled in the art can make various improvements, modifications, or variations without departing from the principles of this application, and can also combine the above technical features in an appropriate manner. These improvements, modifications, variations, or combinations, or the direct application of the concept and technical solution of this application to other situations without modification, should all be considered as protected by this application.

Claims

1. A dual-loop agricultural machinery thermal management system, characterized in that, The system includes a compression branch, a refrigeration branch, a first heat exchange branch, a battery pack thermal management circuit, a second heat exchange branch, a media conveying branch, a third heat exchange branch, a blower (11), a first connecting branch, a second connecting branch, a third connecting branch, and a reversing valve (12). The compression branch is used to compress and drive the refrigerant flow. The refrigeration branch is connected to the compression branch and the first heat exchange branch respectively and is used for refrigerant condensation and controlling whether the refrigerant flows to the first heat exchange branch via the refrigeration branch. The first heat exchange branch is used to exchange heat between the refrigerant and the coolant in the battery pack thermal management circuit. The battery pack thermal management circuit is used to drive the coolant to circulate to cool or preheat the battery pack. The second heat exchange branch is used for refrigerant evaporation or condensation. The media conveying branch is connected to the third heat exchange branch and is used for refrigerant delivery. The third heat exchange branch is used to exchange heat between the refrigerant and the air around the blower (11). The blower (11) is used to deliver the refrigerant to the air around the blower (11). The cab delivers cold or hot air. The first connecting branch is connected to the return end of the compression branch and the first heat exchange branch respectively and is used to control whether the return end of the compression branch and the first heat exchange branch are connected. The second connecting branch is connected to the first heat exchange branch and the second heat exchange branch respectively and is used to control whether the first heat exchange branch and the second heat exchange branch are connected. The third connecting branch is connected to the first heat exchange branch and the media supply branch respectively and is used to control whether the first heat exchange branch and the second heat exchange branch are connected. The reversing valve (12) is connected to the output end of the compression branch, the return end of the compression branch, the second heat exchange branch and the media supply branch respectively and is used to control the direction of refrigerant flow so that the supply end of the compression branch is connected to the second heat exchange branch and the return end of the compression branch is connected to the media supply branch, or the supply end of the compression branch is connected to the media supply branch and the return end of the compression branch is connected to the second heat exchange branch.

2. The dual-loop agricultural machinery thermal management system according to claim 1, characterized in that, The first heat exchange branch includes a heat exchange branch pipe connected to the refrigeration branch, the first connecting branch, the second connecting branch and the third connecting branch respectively, and an expansion valve (21), a heat exchanger (22) and a solenoid valve (23) arranged sequentially on the heat exchange branch pipe. The heat exchange end of the heat exchanger (22) is connected to the battery pack thermal management circuit.

3. The dual-loop agricultural machinery thermal management system according to claim 2, characterized in that, The battery pack thermal management circuit includes a circulation pipeline connected to the heat exchange end of heat exchanger 1 (22), an expansion tank (31) connected to the circulation pipeline, and a circulation pump (32) and a battery pack water jacket (33) arranged sequentially on the circulation pipeline.

4. The dual-loop agricultural machinery thermal management system according to any one of claims 1-3, characterized in that, The third heat exchange branch includes a heat exchange branch pipe three connected to the second heat exchange branch and the media transmission branch respectively, and an expansion valve two (41), a heat exchanger two (42) and a solenoid valve two (43) arranged sequentially on the heat exchange branch pipe three. The heat exchanger two (42) is used to exchange heat with the air around the blower (11).

5. The dual-loop agricultural machinery thermal management system according to any one of claims 1-3, characterized in that, The refrigeration branch includes a refrigeration branch pipe connected to the delivery end of the compression branch and the first heat exchange branch, a solenoid valve three (51) installed on the refrigeration branch pipe, and a heat exchanger three (52) installed on the refrigeration branch pipe.

6. The dual-loop agricultural machinery thermal management system according to any one of claims 1-3, characterized in that, The second heat exchange branch includes a second heat exchange branch pipe connected to the reversing valve (12), the first connecting branch and the third heat exchange branch respectively, and a fourth heat exchanger (13) arranged on the second heat exchange branch pipe.

7. The dual-loop agricultural machinery thermal management system according to any one of claims 1-3, characterized in that, The compression branch includes a compression branch pipe, a compressor (61) installed on the compression branch pipe, and a gas-liquid separator (62) installed on the compression branch pipe.

8. The dual-loop agricultural machinery thermal management system according to any one of claims 1-3, characterized in that, The first connecting branch includes a connecting branch pipe 1 that is connected to the return end of the compression branch and the first heat exchange branch respectively, and a solenoid valve 4 (14) installed on the connecting branch pipe 1; and / or The second connecting branch includes a connecting branch pipe two that is connected to the first heat exchange branch and the second heat exchange branch respectively, and a solenoid valve five (15) installed on the connecting branch pipe two; and / or The third connecting branch includes a connecting branch pipe three that is connected to the first heat exchange branch and the media transmission branch respectively, and a solenoid valve six (16) installed on the connecting branch pipe three.

9. The dual-loop agricultural machinery thermal management system according to any one of claims 1-3, characterized in that, The media transmission branch includes a media transmission branch pipe that is connected to the reversing valve (12), the third connection branch and the third heat exchange branch respectively, and a solenoid valve seven (17) installed on the media transmission branch pipe.

10. An electric agricultural machine, characterized in that, Includes the dual-loop agricultural machinery thermal management system as described in any one of claims 1-9.

Images