Low-carbon drying and refrigerating all-in-one machine

Abstract

The utility model relates to the technical field of drying and refrigerating, in particular to a low-carbon drying and refrigerating all-in-one machine which comprises an air source heat pump module, an energy storage module connected with the air source heat pump module and a working cavity connected with the energy storage module. The air source heat pump module comprises a fluid separator, a compressor connected with an outlet of the fluid separator, a four-way reversing valve connected with an outlet of the compressor, a first heat exchanger and a second heat exchanger, wherein the first heat exchanger and the second heat exchanger are connected with the four-way reversing valve. Wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are respectively connected with different ports of the four-way reversing valve; the energy storage module comprises an energy storage tank with an inlet connected with the first heat exchanger, a pump connected with an outlet of the energy storage tank, and a third heat exchanger connected with the pump. The third heat exchanger is also connected with the first heat exchanger; and the working chamber is connected with the third heat exchanger through a recovery pipeline.

Description

Technical Field

[0001] This utility model relates to the field of drying and refrigeration technology, and in particular to a low-carbon integrated drying and refrigeration machine. Background Technology

[0002] Traditional drying technologies generally suffer from drawbacks such as high energy consumption, complex operation, and long drying cycles. Furthermore, these methods often fail to ensure product quality and nutritional value, and their energy utilization efficiency is low. In addition, drying and refrigeration are routine technical requirements for food and agricultural product processing. Currently, the most commonly used and mature technologies are ammonia systems and pure fluorine systems. However, these traditional refrigeration technologies still have shortcomings in terms of applicability, energy efficiency, and environmental friendliness. For example, ammonia systems must be used rationally while meeting safety requirements, while pure fluorine systems, due to the large-scale use of refrigerants with high ODP and high GWP, have poor environmental performance.

[0003] Carbon dioxide is a naturally occurring, environmentally friendly refrigerant with stable chemical and thermodynamic properties. Even at high temperatures, it does not decompose into harmful gases, and any leaks pose no harm to humans, food, or the environment. When used as a refrigerant, carbon dioxide has low viscosity, low flow resistance, and better heat transfer performance than Freon-based refrigerants. Using carbon dioxide as a refrigerant directly consumes carbon dioxide; in a sense, large-scale use of carbon dioxide as a refrigerant is the optimal path for the development of refrigeration and drying technologies under the dual-carbon objective.

[0004] In response, CN110822761A discloses a refrigeration and heating system based on a four-way reversing valve. This system uses the four-way reversing valve to switch between refrigeration and heating in a carbon dioxide system, thus requiring only one compressor to achieve both functions. However, this disclosed technology requires multiple four-way reversing valves in the overall system, resulting in a complex piping structure.

[0005] Therefore, from the perspective of simplifying the integrated carbon dioxide refrigeration and drying equipment, further optimization and improvement of its overall pipeline structure design are still needed. Utility Model Content

[0006] The purpose of this invention is to provide a low-carbon drying and refrigeration integrated machine to solve the technical problem of optimizing its pipeline structure.

[0007] The low-carbon drying and refrigeration integrated machine of this utility model is implemented as follows:

[0008] A low-carbon integrated drying and refrigeration unit includes: an air source heat pump module, an energy storage module connected to the air source heat pump module, and a working chamber connected to the energy storage module; wherein...

[0009] The air source heat pump module includes a fluid separator, a compressor connected to the outlet of the fluid separator, a four-way reversing valve connected to the outlet of the compressor, and a first heat exchanger and a second heat exchanger respectively connected to the four-way reversing valve; wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are respectively connected to different ports of the four-way reversing valve.

[0010] The energy storage module includes an energy storage tank with its inlet connected to a first heat exchanger, a pump connected to the outlet of the energy storage tank, and a third heat exchanger connected to the pump; wherein the third heat exchanger is also connected to the first heat exchanger.

[0011] The working chamber is connected to the third heat exchanger via a recovery pipeline.

[0012] In an optional embodiment of this invention, the outlet of the first heat exchanger is connected to the inlet of the first pressure reducing valve and the left end of the first rotary valve, respectively.

[0013] In an optional embodiment of this utility model, the outlet of the first pressure-reducing valve and the right end of the first rotary valve converge and are then connected to the inlet of the second pressure-reducing valve and the right end of the second rotary valve, respectively; and

[0014] The outlet of the second pressure reducing valve and the left end of the second rotary valve converge and are connected to the second heat exchanger.

[0015] In an optional embodiment of this invention, the energy storage module further includes an energy storage medium suitable for circulation between the first heat exchanger storage tank and the third heat exchanger.

[0016] In an optional embodiment of this utility model, in heating mode, the four-way reversing valve connects the compressor outlet to the first heat exchanger and the second heat exchanger to the fluid separator. Low-temperature, low-pressure carbon dioxide gas is transformed into high-temperature, high-pressure supercritical carbon dioxide or superheated carbon dioxide gas by the compressor. It then enters the first heat exchanger through the four-way reversing valve and is transformed into low-temperature, high-pressure liquid carbon dioxide. The first rotary valve is opened, and the gas is transformed into low-temperature, low-pressure gas-liquid two-phase carbon dioxide by the second pressure reducing valve. It then passes through the second heat exchanger and is transformed into low-temperature, low-pressure gas carbon dioxide gas. Finally, it flows through the fluid separator via the four-way reversing valve back to the compressor.

[0017] In an optional embodiment of this utility model, in heating mode, the energy storage medium absorbs heat through the first heat exchanger and enters the energy storage tank for storage. When the heat reaches its lowest value, the energy storage medium stores the heat in the energy storage tank. When the energy reaches its peak value, the heat is released into the working chamber by a pump flowing through the third heat exchanger.

[0018] In an optional embodiment of this utility model, in refrigeration mode, the four-way reversing valve connects the compressor outlet to the second heat exchanger and the first heat exchanger to the fluid separator. Low-temperature, low-pressure carbon dioxide gas is transformed into high-temperature, high-pressure supercritical carbon dioxide or superheated carbon dioxide gas by the compressor. It then enters the second heat exchanger through the four-way reversing valve and is transformed into high-temperature, high-pressure liquid carbon dioxide. The second rotary valve is opened, and the gas is transformed into low-temperature, low-pressure gas-liquid two-phase carbon dioxide by the first pressure reducing valve. It then passes through the first heat exchanger and is transformed into low-temperature, low-pressure gas carbon dioxide gas. Finally, it flows through the fluid separator via the four-way reversing valve back to the compressor.

[0019] In an optional embodiment of this utility model, in the cooling mode, the energy storage medium absorbs cold energy through the first heat exchanger and enters the energy storage tank for storage. When the heat reaches its lowest value, the energy storage medium stores the cold energy in the energy storage tank. When the energy reaches its peak value, the cold energy is released into the working chamber by the pump flowing through the third heat exchanger.

[0020] In an optional embodiment of this invention, the third heat exchanger is connected to the first heat exchanger via a shut-off valve.

[0021] In an optional embodiment of this invention, an induced draft fan is provided in the recovery pipeline.

[0022] By adopting the above technical solution, this utility model has the following beneficial effects: The low-carbon drying and refrigeration integrated machine of this utility model, through a four-way reversing valve, changes the circulation path of the carbon dioxide working fluid in the carbon dioxide air source heat pump system. This allows the first heat exchanger to freely switch between acting as an air cooler for heating during the drying stage and as an evaporator for cooling during the refrigeration stage, meeting the needs of different materials for heat and cold sources, enabling the system to operate across seasons, achieving high-efficiency energy utilization, reducing energy consumption and carbon emissions, and simultaneously improving the quality and efficiency of product drying and refrigeration. Furthermore, through optimized pipeline design, the entire low-carbon drying and refrigeration integrated machine only requires one compressor and one four-way reversing valve to meet usage requirements. Attached Figure Description

[0023] Figure 1 The diagram shown is a structural schematic of the low-carbon drying and refrigeration integrated machine of this utility model in heating mode.

[0024] Figure 2 The diagram shown is a structural schematic of the low-carbon drying and refrigeration integrated machine of this utility model in refrigeration mode.

[0025] In the diagram: Air source heat pump module 1, fluid separator 12, compressor 11, four-way reversing valve 13, first heat exchanger 15, first rotary valve 18, first pressure reducing valve 19, second rotary valve 16, second pressure reducing valve 17, second heat exchanger 14, energy storage tank 23, pump 22, third heat exchanger 21, shut-off valve 24, drying chamber 31, cold storage chamber 32, energy storage module, working chamber 3. Detailed Implementation

[0026] To make the contents of this utility model easier to understand, the present utility model will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0027] Please see Figure 1 and Figure 2 As shown, this embodiment provides a low-carbon drying and refrigeration integrated machine, including: an air source heat pump module 22 1, an energy storage module 2 connected to the air source heat pump module 22 1, and a working chamber 3 connected to the energy storage module 2. The working chamber 3, depending on the actual working conditions, can be used as a refrigeration chamber 32 or a drying chamber 31, thereby enabling the low-carbon drying and refrigeration integrated machine of this embodiment to meet the needs of different material heat and cold sources and achieve cross-seasonal operation of the system.

[0028] Specifically, the air source heat pump module 22 1 includes a fluid separator 12, a compressor 11 connected to the outlet of the fluid separator 12, a four-way reversing valve 13 connected to the outlet of the compressor 11, and a first heat exchanger 15 and a second heat exchanger 14 connected to the four-way reversing valve 13, respectively. The compressor 11, fluid separator 12, first heat exchanger, and second heat exchanger are connected to different ports of the four-way reversing valve 13. The first heat exchanger 15 acts as a heat exchanger during the drying stage of heating and as an evaporator during the refrigeration stage of cooling. In this embodiment, the air source heat pump module 22 1 is a carbon dioxide refrigeration and heating module using carbon dioxide as the medium.

[0029] It should be noted that the structure and implementation principle of the four-way reversing valve 13 in this embodiment are not absolutely limited. It can adopt any mature means in the prior art. That is, as long as the circulation path of carbon dioxide working fluid in the carbon dioxide air source heat pump 22 system can be changed by the four-way reversing valve 13, the usage requirements of this embodiment are met.

[0030] Secondly, the energy storage module 2 includes an energy storage tank 23 connected to the inlet of the first heat exchanger 15, a pump 22 connected to the outlet of the energy storage tank 23, and a third heat exchanger 21 connected to the pump 22; wherein the third heat exchanger 21 is also connected to the first heat exchanger 15; the working chamber 3 here is connected to the third heat exchanger 21 through a recovery pipeline. The third heat exchanger 21 is connected to the first heat exchanger 15 through a shut-off valve 24. An induced draft fan is provided in the recovery pipeline.

[0031] Based on the above, further, the outlet of the first heat exchanger 15 is connected to the inlet of the first pressure-reducing valve 19 and the left end of the first rotary valve 18, respectively. Here, the first pressure-reducing valve 19 and the first rotary valve 18 are connected in parallel. Accordingly, the outlet of the first pressure-reducing valve 19 and the right end of the first rotary valve 18 converge and are then connected to the inlet of the second pressure-reducing valve 17 and the right end of the second rotary valve 16, respectively; and the outlet of the second pressure-reducing valve 17 and the left end of the second rotary valve 16 converge and are then connected to the second heat exchanger 14. Here, the second pressure-reducing valve 17 and the second rotary valve 16 are connected in parallel.

[0032] It should also be noted that the energy storage module 2 includes an energy storage medium suitable for circulation between the first heat exchanger energy storage tank 23 and the third heat exchanger 21. The energy storage medium here can be, for example, but not limited to, ethylene glycol. Using an ethylene glycol solution as the energy storage medium can ensure the normal operation of the equipment under more environmental conditions. Practical use has shown that by using the energy storage module 2 to store the energy generated by the air source heat pump 22 module 1, and using an ethylene glycol solution as the energy storage medium, accurate regulation of energy release and storage during peak and off-peak periods is achieved, reducing system energy consumption by approximately 20% and system carbon emissions by approximately 15%.

[0033] Based on the above structure, it is also necessary to explain that in heating mode, the four-way reversing valve connects the outlet of compressor 11 to the first heat exchanger 15 and the second heat exchanger 14 to the fluid separator 12. Low-temperature, low-pressure carbon dioxide gas is transformed into high-temperature, high-pressure supercritical carbon dioxide or superheated carbon dioxide gas through compressor 11. It then enters the first heat exchanger 15 through the four-way reversing valve 13 and is transformed into low-temperature, high-pressure carbon dioxide liquid. The first rotary valve 18 is opened (at this time, the second rotary valve 16 is closed), and the gas is transformed into low-temperature, low-pressure carbon dioxide gas-liquid two-phase gas through the second pressure reducing valve 17. It is then transformed into low-temperature, low-pressure carbon dioxide gas through the second heat exchanger 14 and finally flows back to compressor 11 through the four-way reversing valve 13 and the fluid separator 12. Based on this, in the heating mode, the energy storage medium absorbs heat through the first heat exchanger 15 and enters the energy storage tank 23 for storage. When the heat reaches the trough, the energy storage medium stores the heat in the energy storage tank 23. When the energy reaches the peak, the heat is released into the working chamber 3 by the pump 22 through the third heat exchanger 21.

[0034] Furthermore, in cooling mode, the four-way reversing valve connects the outlet of compressor 11 to the second heat exchanger 14 and the first heat exchanger 15 to the fluid separator 12. Low-temperature, low-pressure carbon dioxide gas is transformed into high-temperature, high-pressure supercritical carbon dioxide or superheated carbon dioxide gas by compressor 11. It then enters the second heat exchanger 14 through the four-way reversing valve 13 and is converted into high-temperature, high-pressure liquid carbon dioxide. The second rotary valve 16 is opened (at this time, the first rotary valve 18 is closed), and the gas is converted into low-temperature, low-pressure two-phase carbon dioxide gas through the first pressure reducing valve 19. It is then converted back into low-temperature, low-pressure carbon dioxide gas through the first heat exchanger 15 and finally flows back to compressor 11 through the four-way reversing valve 13 and the fluid separator 12. Based on this, in cooling mode, the energy storage medium absorbs cold energy through the first heat exchanger 15 and enters the energy storage tank 23 for storage. When the heat reaches its lowest value, the energy storage medium stores the cold energy in the energy storage tank 23. When the energy reaches its peak value, the cold energy is released into the working chamber 3 by pump 22 through the third heat exchanger 21.

[0035] In summary, for the low-carbon drying and refrigeration integrated machine of this embodiment, the circulation path of the carbon dioxide working fluid in the carbon dioxide air source heat pump 22 system is changed by the four-way reversing valve 13, so that the first heat exchanger 15 can freely switch between acting as an air cooler for heating during the drying stage and as an evaporator for cooling during the refrigeration stage. This meets the needs of different materials for heat and cold sources, enables the system to operate across seasons, achieves high-efficiency energy utilization, reduces energy consumption and carbon emissions, and improves the quality and efficiency of product drying and refrigeration.

[0036] The above specific embodiments further illustrate the purpose, technical solution, and beneficial effects of this utility model. It should be understood that the above are only specific embodiments of this utility model and are not intended to limit this utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

[0037] In the description of this utility model, it should be understood that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0038] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0039] In this invention, unless otherwise expressly specified and limited, "above or below" the first feature may include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on" the first feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the first feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

Claims

1. A low-carbon dry refrigeration all-in-one machine, characterized in that, Comprise: An air source heat pump module, an energy storage module connected to the air source heat pump module, and a working chamber connected to the energy storage module; Wherein The air source heat pump module comprises a fluid separator, a compressor connected to the outlet of the fluid separator, a four-way reversing valve connected to the outlet of the compressor, and a first heat exchanger and a second heat exchanger connected to the four-way reversing valve respectively; wherein the compressor, the fluid separator, the first heat exchanger and the second heat exchanger are connected to different ports of the four-way reversing valve respectively; The energy storage module comprises an energy storage tank connected to the first heat exchanger, a pump connected to the outlet of the energy storage tank, and a third heat exchanger connected to the pump; wherein the third heat exchanger is also connected to the first heat exchanger; The working chamber is connected to the third heat exchanger through a recovery pipeline.

2. The low-carbon dry-chilling all-in-one machine according to claim 1, characterized in that, The outlet of the first heat exchanger is connected to the inlet of the first pressure reducing valve and the left end of the first screw valve respectively.

3. The low-carbon dry-chilling all-in-one machine according to claim 2, characterized in that, The outlet of the first pressure reducing valve and the right end of the first screw valve are connected to the inlet of the second pressure reducing valve and the right end of the second screw valve respectively; and The outlet of the second pressure reducing valve and the left end of the second screw valve are connected to the second heat exchanger.

4. The low-carbon dry-chilling all-in-one machine according to claim 3, characterized in that, The energy storage module further comprises an energy storage medium adapted to flow between the first heat exchanger, the energy storage tank and the third heat exchanger.

5. The low-carbon dry-chilling all-in-one machine according to claim 4, characterized in that, In heating mode, the four-way reversing valve connects the outlet of the compressor to the first heat exchanger and connects the second heat exchanger to the fluid separator; low-temperature and low-pressure carbon dioxide gas becomes high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas after being compressed by the compressor, enters the first heat exchanger through the four-way reversing valve, and is converted into low-temperature and high-pressure carbon dioxide liquid; the first screw valve is opened, the low-temperature and low-pressure carbon dioxide gas-liquid two-phase is converted into low-temperature and low-pressure carbon dioxide gas through the second pressure reducing valve, and the low-temperature and low-pressure carbon dioxide gas is converted into low-temperature and low-pressure carbon dioxide gas through the second heat exchanger, and finally flows through the fluid separator back to the compressor through the four-way reversing valve.

6. The low-carbon dry-chilling all-in-one machine according to claim 5, characterized in that, In heating mode, the energy storage medium absorbs heat through the first heat exchanger and stores it in the energy storage tank; when the heat reaches the valley, the energy storage medium stores the heat in the energy storage tank; when the energy reaches the peak, the heat is released to the working chamber through the pump and the third heat exchanger.

7. The low-carbon dry-chilling all-in-one machine according to any one of claims 4-6, characterized in that, In cooling mode, the four-way reversing valve connects the outlet of the compressor to the second heat exchanger and connects the first heat exchanger to the fluid separator; low-temperature and low-pressure carbon dioxide gas becomes high-temperature and high-pressure supercritical carbon dioxide or carbon dioxide superheated gas after being compressed by the compressor, enters the second heat exchanger through the four-way reversing valve, and is converted into high-temperature and high-pressure carbon dioxide liquid; the second screw valve is opened, the low-temperature and low-pressure carbon dioxide gas-liquid two-phase is converted into low-temperature and low-pressure carbon dioxide gas through the first pressure reducing valve, and the low-temperature and low-pressure carbon dioxide gas is converted into low-temperature and low-pressure carbon dioxide gas through the first heat exchanger, and finally flows through the fluid separator back to the compressor through the four-way reversing valve.

8. The low-carbon dry-chilling all-in-one machine according to claim 7, characterized in that, In cooling mode, the energy storage medium absorbs cold through the first heat exchanger and stores it in the energy storage tank; when the heat reaches the valley, the energy storage medium stores the cold in the energy storage tank; when the energy reaches the peak, the cold is released to the working chamber through the pump and the third heat exchanger.

9. The low-carbon dry-chilling all-in-one machine according to any one of claims 1-4, characterized in that, The third heat exchanger is connected to the first heat exchanger through a stop valve.

10. The low-carbon dry-chilling all-in-one machine according to claim 1, characterized in that, A fan is arranged in the recovery pipeline.

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