A double-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food fresh-keeping freezer

Abstract

This invention discloses a dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food freezers, belonging to the field of waste heat recovery equipment. It includes a condenser and heat exchange components. The heat exchange components include a heat exchange frame, a liquid delivery pipe, an air duct, a heat exchange box, and a heating tank. The heat exchange frame is tightly engaged with the condenser via a slot. The liquid delivery pipe connects to the heat exchange frame through a first liquid outlet pipe. The air duct extends through the liquid delivery pipe to the heat exchange box, and its input end is equipped with an air duct with an exhaust fan. The heat exchange box contains a heat exchange tank and an insulation cavity. The liquid delivery pipe connects to the heat exchange tank, and the air duct outlet pipe leads into the insulation cavity. The heat exchange tank returns liquid via a second liquid outlet pipe equipped with a first water pump. The heating tank contains a gas tank with protrusions, and a heating pipe with a spiral heat exchange section extends into the heat exchange tank, forming a dual-loop system with an exhaust pipe and a vent pipe. This invention is compact, easy to install, and the dual-loop system improves waste heat recovery efficiency, reduces heat loss and energy consumption, does not affect refrigeration and freshness preservation, allows for secondary utilization of waste heat, and is suitable for the needs of pre-prepared food freezers.

Description

Technical Field

[0001] This invention relates to the field of waste heat recovery devices, and more specifically, to a dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food freezers. Background Technology

[0002] Pre-prepared food preservation requires extremely high temperature stability. Cold storage facilities, as the core storage infrastructure, rely heavily on refrigeration equipment to maintain a low-temperature environment to inhibit the growth of microorganisms and preserve the original flavor and nutrients of the food. Currently, most refrigeration equipment used in pre-prepared food preservation cold storage facilities employs a single-loop refrigeration structure. During operation, the condenser continuously releases a large amount of waste heat. If this waste heat is directly discharged into the external environment, it will not only cause serious energy waste but also raise the ambient temperature around the cold storage, indirectly increasing the operating load on the refrigeration equipment and further increasing energy consumption.

[0003] To address the aforementioned energy waste issues, some existing refrigeration equipment with waste heat recovery capabilities has emerged. However, these devices generally suffer from low waste heat recovery efficiency and unreasonable structural design, making it difficult to meet the actual needs of pre-prepared food preservation freezers. Specifically, the heat exchange structure of existing waste heat recovery refrigeration equipment is mostly a single heat exchange path, with insufficient connection between heat exchange components. The waste heat released by the condenser cannot fully contact the heat exchange medium, resulting in a large amount of waste heat not being effectively recovered and utilized, with a waste heat recovery conversion rate typically below 30%. Furthermore, the heat exchange components of existing equipment lack reasonable flow guidance and insulation design, leading to heat loss during the heat exchange process, further reducing waste heat recovery efficiency. Additionally, the poor circulation of the heat exchange medium hinders efficient transfer and secondary utilization of waste heat. Summary of the Invention

[0004] In order to overcome the shortcomings of the prior art, the technical problem to be solved by the present invention is to provide a dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food freezers, which can reuse the waste heat generated during the operation of the refrigeration unit and improve the waste heat recovery efficiency.

[0005] To achieve this objective, the present invention adopts the following technical solution: This invention provides a dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food freezers, including a condenser and a heat exchange component. The heat exchange component includes a heat exchange frame, a liquid delivery pipe, an air guide pipe, and a heat exchange box. A slot is provided in the middle of the heat exchange frame, and the condenser is snapped into the slot and tightly connected to the slot. One end of the liquid delivery pipe is located on one side of the condenser. One side of the heat exchange frame is connected to the liquid delivery pipe through multiple first liquid outlet pipes. The air guide pipe passes through one side of the liquid delivery pipe and extends into the interior of the liquid delivery pipe. Both the liquid delivery pipe and the air guide pipe extend into the heat exchange box.

[0006] In a preferred embodiment of the present invention, an air guide hopper is provided at the input end of the air guide duct, and an exhaust fan is provided inside the air guide hopper, with the exhaust fan located on one side of the condenser.

[0007] In a preferred embodiment of the present invention, a heat exchange tank is further provided inside the heat exchange box. The heat exchange tank is fixed inside the heat exchange box by a bracket. There is an insulation cavity between the heat exchange tank and the heat exchange box. The other end of the infusion pipe passes through the bottom wall of the heat exchange box and is connected to the bottom of the heat exchange tank. The output end of the air guide pipe is connected to multiple air outlet pipes. The air outlet pipes pass through the side wall of the infusion pipe and extend into the insulation cavity. A second liquid outlet pipe is connected to the top of the heat exchange tank. The second liquid outlet pipe passes through the top of the heat exchange box and is connected to the other side of the heat exchange frame. A first water pump is provided on the second liquid outlet pipe.

[0008] In a preferred embodiment of the present invention, the heat exchange component further includes a heating tank and a heating tube. The heating tank is disposed on one side of the heat exchange box, and the two ends of the heating tube are connected to the heating tank. The middle part of the heating tube passes through the heat exchange box and the heat exchange tank and extends into the interior of the heat exchange tank. A second water pump is provided on the heating tube.

[0009] In a preferred embodiment of the present invention, a heat exchange section is provided on the heating tube, the heat exchange section is formed by spirally arranging the heating tube from top to bottom, and the heat exchange section is disposed inside the heat exchange tank.

[0010] In a preferred embodiment of the present invention, a gas tank is provided inside the heating tank; one end of a first exhaust pipe is connected to the top of the heat exchange box, the other end of the first exhaust pipe passes through the heating tank and is connected to the bottom of the gas tank, a second exhaust pipe is connected to the top of the gas tank, the second exhaust pipe extends to the top of the heating tank, and an exhaust valve is connected to the upper end of the second exhaust pipe.

[0011] In a preferred embodiment of the present invention, the gas tank is provided with a protrusion for increasing the contact area, the protrusion extending outward from the side wall of the gas tank, and the protrusion being inclined downward from the middle of the gas tank.

[0012] In a preferred embodiment of the present invention, a first vent pipe is connected to the first exhaust pipe via a first three-way valve, and a second vent pipe is connected to the air duct via a second three-way valve.

[0013] The beneficial effects of this invention are as follows: This invention provides a dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food freezers, significantly improving waste heat recovery efficiency and achieving efficient energy recycling. The invention utilizes an integrated heat exchange component, with the condenser securely fitted into the slot of the heat exchange frame. This ensures that the waste heat released by the condenser is quickly conducted to the heat exchange frame and then evenly transferred to the delivery pipe through multiple liquid outlet pipes. Simultaneously, an air guide pipe extends through the delivery pipe into the interior, allowing the hot airflow to fully contact the heat exchange medium within the delivery pipe, significantly increasing the heat exchange contact area. Combined with the insulation cavity design within the heat exchange box, heat loss during the heat exchange process is effectively reduced, preventing waste heat leakage. Furthermore, the spiral heat exchange section on the heating tube further extends the heat exchange path, improving the sufficiency of heat exchange between waste heat and the heating medium. Compared to existing single-heat-exchange-path devices, this fully recovers and utilizes the waste heat generated during the refrigeration process, reducing the overall energy consumption of the pre-prepared food freezer and achieving energy savings.

[0014] This equipment features a reasonable and compact structural design, making it easy to install and requiring minimal space. The invention integrates components such as the condenser, heat exchange frame, liquid delivery pipe, air duct, and heat exchange box, replacing the separate structure of the refrigeration equipment and waste heat recovery components in existing technologies. This not only simplifies the overall structure of the equipment, facilitating installation and disassembly, but also significantly reduces the space occupied, making it suitable for pre-prepared food freezers of different specifications. Furthermore, the tight connections between components, such as the snap-fit ​​structure between the heat exchange frame and the condenser, and the connection structure between the liquid delivery pipe and the liquid outlet pipe, ensure the stability of the equipment's operation, reduce heat leakage caused by gaps in component connections, and further guarantee the waste heat recovery effect.

[0015] This invention constructs a dual-loop waste heat recovery system. On the one hand, through a loop formed by the infusion pipe, heat exchange tank, and return pipe, it achieves preliminary recovery and recycling of waste heat. On the other hand, through a loop formed by the heating tank, heating pipe, and gas tank, it achieves secondary recovery and efficient utilization of waste heat. The dual loops work together, which not only does not affect the cooling effect of the refrigeration equipment on the cold storage, ensuring that the cold storage maintains a stable low-temperature preservation environment, but also efficiently recovers waste heat for other scenarios that require heat (such as auxiliary heating of the cold storage, hot water supply, etc.), realizing the dual functions of refrigeration and waste heat recovery, perfectly adapting to the actual use needs of pre-prepared food preservation cold storage. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the structure of a dual-loop waste heat recovery refrigeration integrated device for pre-prepared food freezers, provided in a specific embodiment of the present invention. Figure 2 yes Figure 1 Enlarged view of point A in the middle; Figure 3 yes Figure 1 Enlarged diagram of point B in the middle.

[0017] In the picture: 1. Condenser; 21. Heat exchange frame; 22. Liquid delivery pipe; 23. Air duct; 231. Air outlet pipe; 232. Second three-way valve; 233. Second vent pipe; 24. Heat exchange box; 25. Heat exchange tank; 26. Air guide duct; 27. Exhaust fan; 28. First liquid outlet pipe; 29. ​​Second liquid outlet pipe; 20. First water pump; 31. Heating tank; 32. Heating tube; 33. Heat exchange section; 34. First exhaust pipe; 35. First three-way valve; 36. First vent pipe; 37. Second exhaust pipe; 38. Exhaust valve; 39. Second water pump; 30. Gas tank; 301. Protrusion. Detailed Implementation

[0018] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0019] like Figures 1-3 As shown in the embodiment, a dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food freezers is provided, including a condenser 1 and 33 heat exchange units. The 33 heat exchange units include a heat exchange frame 21, a liquid delivery pipe 22, an air guide pipe 23, and a heat exchange box 24. A slot is provided in the middle of the heat exchange frame 21, and the condenser 1 is snapped into the slot and tightly connected to the slot. One end of the liquid delivery pipe 22 is located on one side of the condenser 1. One side of the heat exchange frame 21 is connected to the liquid delivery pipe 22 through multiple first liquid outlet pipes 28. The air guide pipe 23 passes through one side of the liquid delivery pipe 22 and extends into the liquid delivery pipe 22. Both the liquid delivery pipe 22 and the air guide pipe 23 extend into the heat exchange box 24.

[0020] The equipment consists of a condenser 1 and 33 heat exchange components. These 33 components, serving as the core carrier for waste heat recovery, integrate a heat exchange frame 21, a liquid delivery pipe 22, an air duct 23, and a heat exchange box 24. These components work together to achieve efficient collection, conduction, and recovery of waste heat. A pre-drilled slot in the center of the heat exchange frame 21, compatible with the condenser 1, is inserted into this slot during assembly, ensuring a tight fit between the condenser 1 and the inner wall of the slot without any noticeable gaps. This tight fit minimizes leakage of waste heat released by the condenser 1 during conduction, allowing the large amount of waste heat generated during condenser 1's operation to be quickly conducted to the entire heat exchange frame 21, laying the foundation for subsequent waste heat recovery.

[0021] One end of the infusion pipe 22 is arranged on one side of the condenser 1 for conveying the heat exchange medium. One side of the heat exchange frame 21 is connected to the infusion pipe 22 through multiple first outlet pipes 28. The uniform arrangement of the multiple first outlet pipes 28 can ensure that the waste heat collected on the heat exchange frame 21 is evenly transferred to the heat exchange medium in the infusion pipe 22, avoiding local overheating and underheating of the heat exchange medium, and improving the heat exchange uniformity. The air guide duct 23 runs through one side of the infusion pipe 22 and extends into the interior of the infusion pipe 22. Both the infusion pipe 22 and the air guide duct 23 extend continuously into the interior of the heat exchange box 24. This structural design allows the hot airflow in the air guide duct 23 to directly contact the heat exchange medium in the infusion pipe 22, further enhancing the heat exchange effect and ensuring that the waste heat can be fully absorbed by the heat exchange medium.

[0022] Furthermore, an air guide hopper 26 is provided at the inlet end of the air guide duct 23, and an exhaust fan 27 is provided inside the air guide hopper 26. The exhaust fan 27 is located on one side of the condenser 1.

[0023] To improve the efficiency of hot air collection, a guide hopper 26 is installed at the inlet of the guide duct 23. The guide hopper 26 is flared to expand the collection range of hot air. An exhaust fan 27 is installed inside the guide hopper 26, located on one side of the condenser 1. During operation, the exhaust fan 27 runs continuously, rapidly drawing the hot air emanating from the surface of the condenser 1 into the guide hopper 26, and then transporting it through the guide duct 23 to subsequent structures. This prevents the hot air from accumulating around the condenser 1, reducing natural heat loss and accelerating heat conduction, further improving waste heat recovery efficiency. Furthermore, a heat exchange tank 25 is also provided inside the heat exchange box 24. The heat exchange tank 25 is fixed inside the heat exchange box 24 by a bracket. There is an insulation cavity between the heat exchange tank 25 and the heat exchange box 24. The other end of the infusion pipe 22 passes through the bottom wall of the heat exchange box 24 and is connected to the bottom of the heat exchange tank 25. The output end of the air guide pipe 23 is connected to multiple air outlet pipes 231. The air outlet pipes 231 pass through the side wall of the infusion pipe 22 and extend into the insulation cavity. The top of the heat exchange tank 25 is connected to a second liquid outlet pipe 29. The second liquid outlet pipe 29 passes through the top of the heat exchange box 24 and is connected to the other side of the heat exchange frame 21. A first water pump 20 is provided on the second liquid outlet pipe 29.

[0024] A heat exchange tank 25 is also installed inside the heat exchange box 24. The heat exchange tank 25 is fixed inside the heat exchange box 24 by a bracket. The bracket ensures that the heat exchange tank 25 remains stable during equipment operation and prevents the heat exchange tank 25 from colliding with other components or loosening connections due to vibration. A gap is reserved between the heat exchange tank 25 and the heat exchange box 24 to form an insulation cavity. The insulation cavity can effectively prevent heat loss from the heat exchange tank 25 to the outside, reduce heat loss during the heat exchange process, and ensure the stability of waste heat recovery. The other end of the infusion tube 22 passes through the bottom wall of the heat exchange box 24 and is connected to the bottom of the heat exchange tank 25, so that the heat exchange medium that has absorbed the waste heat in the infusion tube 22 can flow smoothly into the heat exchange tank 25 for subsequent waste heat transfer and secondary recovery; the output end of the air duct 23 is connected to multiple air outlet pipes 231, which pass through the side wall of the infusion tube 22 and extend into the insulation cavity, so that the waste heat that has not been fully absorbed in the air duct 23 can be released into the insulation cavity through the air outlet pipes 231, which plays an auxiliary role in heat preservation of the heat exchange tank 25, while further utilizing the waste heat and avoiding waste of waste heat.

[0025] The top of the heat exchange tank 25 is connected to a second outlet pipe 29. The second outlet pipe 29 passes through the top of the heat exchange box 24, extends and connects to the other side of the heat exchange frame 21, forming a complete heat exchange medium circulation loop. A first water pump 20 is installed on the second outlet pipe 29. The first water pump 20 provides power for the circulation of the heat exchange medium, ensuring that the heat exchange medium can continuously circulate between the delivery pipe 22, the heat exchange tank 25, the second outlet pipe 29 and the heat exchange frame 21, so as to realize the continuous recovery and recycling of waste heat. That is, the initial recovery of waste heat is completed through this loop.

[0026] Furthermore, the heat exchange unit 33 also includes a heating tank 31 and a heating tube 32. The heating tank 31 is located on one side of the heat exchange box 24. The two ends of the heating tube 32 are connected to the heating tank 31, and the middle part of the heating tube 32 passes through the heat exchange box 24 and the heat exchange tank 25 and extends into the interior of the heat exchange tank 25. A second water pump 39 is provided on the heating tube 32.

[0027] To achieve secondary recovery and efficient utilization of waste heat, the heat exchange unit 33 also includes a heating tank 31 and a heating tube 32. The heating tank 31 is located on one side of the heat exchange box 24 and works in conjunction with the heat exchange box 24 to complete secondary waste heat recovery. Both ends of the heating tube 32 are connected to the heating tank 31 to form a circulation loop for the heating medium. The middle part of the heating tube 32 passes through the heat exchange box 24 and the heat exchange tank 25 and extends into the interior of the heat exchange tank 25, allowing the heating tube 32 to directly contact the heat exchange medium inside the heat exchange tank 25 and absorb the waste heat in the heat exchange medium. At the same time, a second water pump 39 is installed on the heating tube 32 to provide power for the circulation of the heating medium, ensuring that the heating medium can continuously circulate between the heating tank 31 and the heating tube 32, and efficiently absorb waste heat.

[0028] To further extend the contact time between the heating tube 32 and the heat exchange medium in the heat exchange tank 25 and expand the contact area, a heat exchange section 33 is provided on the heating tube 32. The heat exchange section 33 is formed by spirally winding the heating tube 32 from top to bottom, and the entire heat exchange section 33 is located inside the heat exchange tank 25. The spiral heat exchange section 33 can significantly increase the contact area of ​​the heating tube 32 in the heat exchange tank 25, while slowing down the flow speed of the heating medium in the heating tube 32, so that the heating medium can fully absorb the waste heat in the heat exchange medium in the heat exchange tank 25, further improving the waste heat recovery conversion rate. Compared with the existing single heat exchange path equipment, it can significantly improve the waste heat recovery effect.

[0029] A gas tank 30 is installed inside the heating tank 31. The gas tank 30 is used to collect the gas generated during the heat exchange process, preventing the gas from accumulating inside the heating tank 31 and affecting the circulation of the heating medium and the waste heat absorption effect. The top of the heat exchange box 24 is connected to one end of a first exhaust pipe 34. The other end of the first exhaust pipe 34 passes through the side wall of the heating tank 31 and is connected to the bottom of the gas tank 30, so that the gas generated in the hot air flow in the heat exchange box 24 can enter the gas tank 30 for collection through the first exhaust pipe 34. The top of the gas tank 30 is connected to a second exhaust pipe 37, which extends to the top of the heating tank 31. An exhaust valve 38 is installed at the upper end of the second exhaust pipe 37. When the gas in the gas tank 30 accumulates to a certain amount, the exhaust valve 38 can be opened to discharge the gas through the second exhaust pipe 37, ensuring the stability of the equipment operation. At the same time, the small amount of waste heat carried in the discharged gas can be further absorbed by the heating medium in the heating tank 31, avoiding waste heat.

[0030] To improve the heat exchange effect between the gas tank 30 and the heating medium in the heating tank 31, a protrusion 301 is provided on the gas tank 30 to increase the contact area. The protrusion 301 extends outward from the side wall of the gas tank 30 and is inclined downward from the middle of the gas tank 30. The inclined protrusion 301 can not only expand the contact area between the gas tank 30 and the heating medium, so that the waste heat carried by the gas in the gas tank 30 can be fully transferred to the heating medium, but also prevent the heating medium from accumulating on the surface of the protrusion 301, ensuring the smooth circulation of the heating medium and further enhancing the secondary waste heat recovery effect.

[0031] Furthermore, a first vent pipe 36 is connected to the first exhaust pipe 34 via a first three-way valve 35, and a second vent pipe 233 is connected to the air duct 23 via a second three-way valve 232. When the air temperature in the first exhaust pipe 34 is detected to be too low and not valuable for recycling, the end of the first three-way valve 35 connected to the first exhaust pipe 34 can be closed, and the end connected to the first vent pipe 36 can be opened. The low-temperature air is then discharged in advance through the first vent pipe 36 to prevent it from entering the gas tank 30 and the heating tank 31, thus avoiding interference with the residual heat absorption effect of the heating medium. Similarly, a second vent pipe 233 is connected to the air duct 23 via a second three-way valve 232. When the temperature of the hot airflow in the air duct 23 does not reach the preset standard and subsequent heat exchange and recovery are not required, the end of the second three-way valve 232 connected to the main body of the air duct 23 can be closed, and the end connected to the second vent pipe 233 can be opened. The low-temperature hot airflow is then discharged in advance through the second vent pipe 233 to prevent it from being introduced into the heat exchange box 24. This ensures that the heat exchange process in the heat exchange box 24 is not affected by the low-temperature airflow, ensuring the high efficiency of waste heat recovery. At the same time, this structure also facilitates equipment maintenance and troubleshooting, improving the ease of equipment operation and maintenance.

[0032] During operation, the condenser 1 runs continuously, providing refrigeration for the pre-prepared food freezer, while simultaneously releasing a large amount of waste heat. The exhaust fan 27 starts, drawing the hot airflow from the surface of the condenser 1 into the air duct 26, which then transports it through the air duct 23. Part of the hot airflow contacts the heat exchange medium inside the liquid delivery pipe 22, transferring the waste heat to the medium. The other part of the hot airflow enters the insulation chamber through the air outlet duct 231, insulating the heat exchange tank 25. After absorbing the waste heat, the heat exchange medium flows into the heat exchange tank 25 through the liquid delivery pipe 22, where it exchanges heat with the heating medium in the heating tube 32, transferring the waste heat to the heat exchange medium. Heat is transferred to the heating medium, completing the initial recovery of waste heat. Driven by the second water pump 39, the heating medium circulates between the heating pipe 32 and the heating tank 31. The absorbed waste heat can be used for scenarios requiring heat, such as auxiliary heating of cold storage and hot water supply, completing the secondary recovery of waste heat. Driven by the first water pump 20, the heat exchange medium in the heat exchange tank 25 flows back to the heat exchange frame 21 through the second liquid outlet pipe 29, and absorbs the waste heat transferred by the condenser 1 again, forming a cycle. The gas generated during the heat exchange process enters the gas tank 30 through the first exhaust pipe 34 for collection. After accumulating to a certain amount, it is discharged through the second exhaust pipe 37 to ensure stable operation of the equipment.

[0033] Through the synergistic cooperation of the above structures, this equipment constructs a dual-loop waste heat recovery system, realizing both preliminary and secondary waste heat recovery. The waste heat recovery conversion rate is significantly improved compared to existing equipment, effectively solving the problems of waste heat waste and low recovery efficiency in existing refrigeration equipment. At the same time, the integrated design of each component results in a compact structure, convenient installation, and small space occupation. It is suitable for pre-prepared food preservation freezers of different specifications, and the tight connection of each component ensures stable operation. It can reduce overall energy consumption while ensuring the low-temperature preservation effect of the freezer, achieving efficient energy recycling and perfectly meeting the actual use needs of pre-prepared food preservation freezers.

[0034] Other techniques in this embodiment are based on existing technologies.

[0035] This invention has been described through preferred embodiments. Those skilled in the art will understand that various changes or equivalent substitutions can be made to these features and embodiments without departing from the spirit and scope of the invention. This invention is not limited to the specific embodiments disclosed herein; other embodiments falling within the scope of the claims are also within the protection scope of this invention.

Claims

1. A dual-loop waste heat recovery refrigeration integrated device suitable for pre-prepared food preservation freezing storage, characterized in that: It includes a condenser (1) and a heat exchange component (33), wherein the heat exchange component (33) includes a heat exchange frame (21), a liquid delivery pipe (22), an air duct (23), and a heat exchange box (24). The heat exchange frame (21) has a slot in the middle, the condenser (1) is snapped into the slot and the condenser (1) is tightly connected to the slot. One end of the infusion pipe (22) is located on one side of the condenser (1). One side of the heat exchange frame (21) is connected to the infusion pipe (22) through multiple first liquid outlet pipes (28). The air guide pipe (23) passes through one side of the infusion pipe (22) and extends into the inside of the infusion pipe (22). Both the infusion pipe (22) and the air guide pipe (23) extend into the heat exchange box (24).

2. The dual-loop waste heat recovery refrigeration integrated equipment for pre-prepared food preservation freezing storage as described in claim 1, characterized in that: The air duct (23) has an air duct (26) at its input end, and an exhaust fan (27) is installed inside the air duct (26). The exhaust fan (27) is located on one side of the condenser (1).

3. The dual-loop waste heat recovery refrigeration integrated equipment for pre-prepared food preservation freezing storage as described in claim 2, characterized in that: The heat exchange box (24) is also equipped with a heat exchange tank (25). The heat exchange tank (25) is fixed inside the heat exchange box (24) by a bracket. There is a heat insulation cavity between the heat exchange tank (25) and the heat exchange box (24). The other end of the infusion pipe (22) passes through the bottom wall of the heat exchange box (24) and is connected to the bottom of the heat exchange tank (25). The output end of the air guide pipe (23) is connected to multiple air outlet pipes (231). The air outlet pipes (231) pass through the side wall of the infusion pipe (22) and extend into the heat insulation cavity. The top of the heat exchange tank (25) is connected to a second liquid outlet pipe (29). The second liquid outlet pipe (29) passes through the top of the heat exchange box (24) and is connected to the other side of the heat exchange frame (21). A first water pump (20) is installed on the second liquid outlet pipe (29).

4. The dual-loop waste heat recovery refrigeration integrated equipment for pre-prepared food preservation freezing storage as described in claim 3, characterized in that: The heat exchange unit (33) also includes a heating tank (31) and a heating tube (32). The heating tank (31) is located on one side of the heat exchange box (24). The two ends of the heating tube (32) are connected to the heating tank (31), and the middle part of the heating tube (32) extends through the heat exchange box (24) and the heat exchange tank (25) into the interior of the heat exchange tank (25). A second water pump (39) is provided on the heating tube (32).

5. The dual-loop waste heat recovery refrigeration integrated equipment for pre-prepared food preservation freezing storage as described in claim 4, characterized in that: The heating tube (32) is provided with a heat exchange section (33), which is formed by spirally arranging the heating tube (32) from top to bottom, and the heat exchange section (33) is located inside the heat exchange tank (25).

6. The dual-loop waste heat recovery refrigeration integrated equipment for pre-prepared food preservation freezing storage as described in claim 5, characterized in that: A gas tank (30) is installed inside the heating tank (31); The top of the heat exchange box (24) is connected to one end of the first exhaust pipe (34), the other end of the first exhaust pipe (34) passes through the heating tank (31) and is connected to the bottom of the gas tank (30), the top of the gas tank (30) is connected to the second exhaust pipe (37), the second exhaust pipe (37) extends to the top of the heating tank (31), and the upper end of the second exhaust pipe (37) is connected to an exhaust valve (38).

7. The dual-loop waste heat recovery refrigeration integrated equipment for pre-prepared food preservation freezing storage as described in claim 6, characterized in that: The gas tank (30) is provided with a protrusion (301) for increasing the contact area. The protrusion (301) extends outward from the side wall of the gas tank (30) and is inclined downward from the middle of the gas tank (30).

8. A dual-loop waste heat recovery refrigeration integrated device for pre-prepared food preservation freezing storage as described in claim 7, characterized in that: The first exhaust pipe (34) is connected to the first vent pipe (36) via the first three-way valve (35), and the air guide pipe (23) is connected to the second vent pipe (233) via the second three-way valve (232).

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