Large-temperature-difference heat pump unit

Abstract

The utility model relates to the field of heat pumps, in particular to a large-temperature-difference heat pump unit which comprises a first circulation pipeline and a second circulation pipeline which conduct heat convection through a medium-temperature evaporative condenser. A refrigerant in the first circulating pipeline passes through the low-temperature evaporator after being cooled by the medium-temperature evaporative condenser, and exchanges heat with the cold circulating pipeline; a cooling medium in the cold-using circulating pipeline is cooled by the low-temperature evaporator and then is conveyed to the cold-using end to supply cold to the outside; a refrigerant in the second circulating pipeline passes through the high-temperature condenser after being heated by the medium-temperature evaporative condenser, and exchanges heat with the heat-using circulating pipeline; and a high-temperature medium in the heat utilization circulating pipeline is heated through the high-temperature condenser and then is conveyed to the heat utilization end to supply heat to the outside. The cold and heat combined supply system capable of refrigerating and heating is established, different temperature requirements in the production process of a lithium battery factory are met, and the energy utilization efficiency is greatly improved.

Description

Technical Field

[0001] The utility model relates to the field of heat pumps, in particular to a large temperature difference heat pump unit. Background Art

[0002] In the production process of lithium battery factories, stable and efficient energy supply is a key factor in ensuring product quality and production efficiency. For example, in the production line of ternary lithium batteries, drying and aging processes are involved, and these processes require the use of heat sources to complete the drying operation; before assembling the battery module, a plasma system cleaning is required to remove dirt on the battery surface in preparation for the next step of battery surface gluing. In this process, maintaining the appropriate temperature of the battery module is crucial to ensure the colloid adhesion effect, so proper cooling is required.

[0003] At present, the existing cooling and heating method of lithium battery factories, as described in patent number "CN221035718U", is that the high-temperature boiler steam condensate of the lithium battery factory is connected to the high-temperature steam condensate pool for collection, and the high-temperature steam condensate pool is connected to a part of the single-rotor dehumidifier for preheating, and the return condensate of this part of the single-rotor dehumidifier is sent to the medium-temperature steam condensate pool, and the medium-temperature steam condensate pool is connected to another part of the single-rotor dehumidifier for preheating, and the return condensate of this part of the single-rotor dehumidifier is sent to the low-temperature steam condensate pool, and the low-temperature steam condensate pool is connected to the cooling tower. It can be seen that the cooling tower that the entire heat recovery process relies on will take up a lot of space, and the operation process is also accompanied by water resource consumption and environmental pollution. At the same time, the cooling water pump relied on during refrigeration will also continue to consume a lot of electricity, increasing the energy cost of the enterprise. Since the energy supply for cooling and heating in the factory operates independently, the comprehensive energy utilization rate is low, and the cooling and heating energy supply systems need to be maintained independently, which further increases production costs, so it needs to be solved urgently. Utility Model Content

[0004] In order to avoid and overcome the technical problems existing in the prior art, the utility model provides a large temperature difference heat pump unit. The utility model establishes a combined cooling and heating system that can both cool and heat, meet the different temperature requirements in the production process of lithium battery factories, and greatly improve energy utilization efficiency.

[0005] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0006] A large temperature difference heat pump unit comprises a first circulation pipeline and a second circulation pipeline for convective heat exchange through a medium temperature evaporation condenser;

[0007] The refrigerant in the first circulation pipeline is cooled by the medium-temperature evaporation condenser and then passes through the low-temperature evaporator, where it exchanges heat with the cold-using circulation pipeline; the cooling medium in the cold-using circulation pipeline is cooled by the low-temperature evaporator and then transported to the cold-using end to supply cold outward.

[0008] The refrigerant in the second circulation pipeline is heated by the medium-temperature evaporation condenser and then passes through the high-temperature condenser, where it exchanges heat with the heat-using circulation pipeline; the high-temperature medium in the heat-using circulation pipeline is heated by the high-temperature condenser and then transported to the heat-using end to supply heat outward.

[0009] As a further solution of the present utility model: along the refrigerant transportation direction, the high-temperature condenser, the high-temperature expansion valve, the medium-temperature evaporation condenser, and the screw high-temperature compressor are arranged in sequence to form the second circulation pipeline.

[0010] As a further solution of the present utility model: at least two groups of the second circulation pipelines are arranged, and each group of the second circulation pipelines shares a group of medium-temperature evaporation condensers.

[0011] As a further solution of the present utility model: the number of the heat-using circulation pipelines corresponds to that of the second circulation pipelines.

[0012] As a further solution of the present utility model: along the refrigerant transportation direction, the low-temperature evaporator, the centrifugal low-temperature compressor, the medium-temperature evaporation condenser, and the low-temperature expansion valve are arranged in sequence to form the first circulation pipeline.

[0013] As a further solution of the present utility model: the refrigerant in the first circulation pipeline is R134a refrigerant.

[0014] As a further solution of the present utility model: the refrigerant in the second circulation pipeline is R245fa refrigerant or R1233zd refrigerant.

[0015] As a further solution of the present utility model: the high-temperature medium at the heat-using end passes through the steam flash tank and the water heat exchanger in sequence and then returns to the heat-using circulation pipeline for recycling.

[0016] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0017] 1. Through the collaborative work of the first circulation pipeline and the second circulation pipeline, the present utility model forms a combined cooling and heating supply system that can both refrigerate and heat, meets the different temperature requirements in the production process of the lithium battery factory, greatly improves the energy utilization efficiency, and realizes energy conservation, emission reduction, and sustainable development.

[0018] 2. During the entire refrigeration and heating processes of the present utility model, there is no need to introduce a cooling tower and a cooling water pump, which greatly reduces the equipment cost, floor area, and maintenance workload. The entire combined cooling and heating supply system operates synchronously. While achieving combined cooling and heating supply with a large temperature difference, the system is reliable and stable, improving product quality and production efficiency, and effectively reducing the energy consumption and operation cost of the lithium battery factory.

[0019] 3. The present utility model uses different types of refrigerants to work within a temperature range, improving the energy conversion efficiency and system performance. Each unit operates in coordination and is intelligently regulated to ensure the stability and continuity of energy supply, meeting the production requirements of the lithium battery factory. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 is a schematic structural diagram of the present utility model.

[0021] In the figure:

[0022] 1. Low-temperature evaporator; 2. Medium-temperature evaporative condenser;

[0023] 21. First circulation pipeline; 211. Centrifugal low-temperature compressor; 212. Low-temperature expansion valve;

[0024] 3. High-temperature condenser; 31. Second circulation pipeline;

[0025] 311. Screw high-temperature compressor; 312. High-temperature expansion valve;

[0026] 4. Cold-using end; 41. Cold-using circulation pipeline;

[0027] 5. Heat-using end; 51. Heat-using circulation pipeline. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0029] Please refer to Figure 1 , in the embodiment of the present utility model, a large-temperature-difference heat pump unit includes a first circulation pipeline 21 and a second circulation pipeline 31. The first circulation pipeline 21 and the second circulation pipeline 31 exchange heat through a medium-temperature evaporative condenser 2. The refrigerant in the first circulation pipeline 21 cools down after passing through the medium-temperature evaporative condenser 2, and the refrigerant in the second circulation pipeline 31 heats up after passing through the medium-temperature evaporative condenser 2.

[0030] The low-temperature evaporator 1, the centrifugal low-temperature compressor 211, the medium-temperature evaporation condenser 2, and the low-temperature expansion valve 212 are arranged in sequence along the refrigerant conveying direction, thus forming a first circulation pipeline 21. The refrigerant in the first circulation pipeline 21 is the R134a refrigerant.

[0031] The high-temperature condenser 3, the high-temperature expansion valve 312, the medium-temperature evaporation condenser 2, and the screw high-temperature compressor 311 are arranged in sequence along the refrigerant conveying direction, thus forming a second circulation pipeline 31. The refrigerant in the second circulation pipeline 31 is the R245fa refrigerant or the R1233zd refrigerant.

[0032] This large temperature difference heat pump unit further includes a cold end 4 and a heat end 5. The cold end 4 is communicated with the cold-use circulation pipeline 41, and the heat end 5 is communicated with the heat-use circulation pipeline 51. After the chilled water in the cold-use circulation pipeline 41 passes through the cold end 4, it is used for workshop refrigeration; the hot water, hot steam or hot water in the heat-use circulation pipeline 51 is connected to the steam flash tank to generate high-temperature steam, and then the steam is transported to the heating equipment through a pipeline. The water generated by the flash evaporation returns to the water heat exchanger for repeated heating use.

[0033] The first circulation pipeline 21 exchanges heat with the cold-use circulation pipeline 41 through the low-temperature evaporator 1. The refrigerant in the first circulation pipeline 21 is heated after passing through the low-temperature evaporator 1, and the refrigerant in the cold-use circulation pipeline 41 is cooled after passing through the low-temperature evaporator 1. The temperature range of the refrigerant in the first circulation pipeline 21 is 60°C to 65°C, and the temperature range of the chilled water in the cold-use circulation pipeline 41 is 7°C to 12°C. The R134a refrigerant is in a low-pressure and low-temperature state in the low-temperature evaporator 1. Through heat exchange with the chilled water flowing through the low-temperature evaporator 1, it quickly evaporates and absorbs heat, reducing the temperature of the water and producing 7°C chilled water for workshop refrigeration. The evaporated low-pressure and low-temperature R134a refrigerant steam is sucked in and compressed by the centrifugal low-temperature compressor 211, and the pressure and temperature increase, becoming high-temperature and high-pressure gas. Subsequently, these high-temperature and high-pressure gases enter the medium-temperature evaporation condenser 2 and exchange heat with the refrigerant from the second circulation pipeline 31, condensing and releasing heat, and the refrigerant turns into high-temperature and high-pressure liquid. After that, through the throttling and pressure reduction effect of the low-temperature expansion valve 212, the refrigerant becomes low-temperature and low-pressure liquid again and returns to the low-temperature evaporator 1 to complete the refrigeration cycle.

[0034] The second circulation pipeline 31 exchanges heat with the heat-using circulation pipeline 51 through the high-temperature condenser 3. The refrigerant in the second circulation pipeline 31 cools down after passing through the high-temperature condenser 3, and the hot water in the heat-using circulation pipeline 51 heats up after passing through the high-temperature condenser 3. The temperature range of the hot water in the heat-using circulation pipeline 51 is 100° to 130°. The R245fa or R1233zd refrigerant is in a low-pressure state in the medium-temperature evaporator condenser 2, absorbs heat and evaporates to become low-temperature and low-pressure steam. The low-temperature and low-pressure steam is sucked in and compressed by the screw high-temperature compressor 311, and the pressure and temperature are further increased. Then, the high-temperature and high-pressure steam enters the high-temperature condenser 3, exchanges heat with the medium to be heated, releases a large amount of heat, and produces hot steam or hot water at 120°C - 130°C. After releasing heat, the high-temperature and high-pressure refrigerant steam condenses into high-temperature and high-pressure liquid, and then passes through the high-temperature expansion valve 312 to throttle and depressurize, becoming low-temperature and low-pressure liquid, and returning to the medium-temperature evaporation condenser 2 to start absorbing heat and evaporating again, completing the heating cycle. The second circulation pipeline 31 is preferably provided with two groups, and the two groups of second circulation pipelines 31 respectively exchange heat with the two groups of heat-using circulation pipelines 51, and the two groups of heat-using circulation pipelines 51 are jointly connected to the heat-using end 5.

[0035] The basic principles of the present application have been described in conjunction with specific embodiments. However, it should be noted that the advantages, benefits, effects, etc. mentioned in the present application are only examples and not limitations. It cannot be considered that these advantages, benefits, effects, etc. are essential for each embodiment of the present application. In addition, the above-disclosed specific details are only for the purposes of illustration and facilitating understanding, rather than limitations. The above details do not limit the present application to necessarily adopt the above specific details to implement.

[0036] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present application are only illustrative examples and do not intend to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any way. Words such as "including", "comprising", "having", etc. are open-ended terms, meaning "including but not limited to", and can be used interchangeably with each other. The word "or" and "and" used herein refer to the word "and / or", and can be used interchangeably with each other, unless the context clearly indicates otherwise. The word "such as" used herein refers to the phrase "such as but not limited to", and can be used interchangeably with each other.

Claims

1. A large temperature difference heat pump unit, characterized in that: It comprises a first circulation pipeline (21) and a second circulation pipeline (31) for convective heat exchange through a medium-temperature evaporative condenser (2); The refrigerant in the first circulation pipeline (21) is cooled by the medium-temperature evaporative condenser (2) and then passes through the low-temperature evaporator (1) to exchange heat with the cold circulation pipeline (41); the cooling medium in the cold circulation pipeline (41) is cooled by the low-temperature evaporator (1) and then transported to the cold end (4) to supply cold to the outside; The refrigerant in the second circulation pipeline (31) is heated by the medium-temperature evaporative condenser (2) and then passes through the high-temperature condenser (3) to exchange heat with the heat-using circulation pipeline (51); the high-temperature medium in the heat-using circulation pipeline (51) is heated by the high-temperature condenser (3) and then transported to the heat-using end (5) to supply heat externally.

2. A large temperature difference heat pump unit according to claim 1, characterized in that: Along the refrigerant conveying direction, the high-temperature condenser (3), the high-temperature expansion valve (312), the medium-temperature evaporative condenser (2) and the screw high-temperature compressor (311) are arranged in sequence to form a second circulation pipeline (31).

3. A large temperature difference heat pump unit according to claim 2, characterized in that: The second circulation pipelines (31) are arranged in at least two groups, and each second circulation pipeline (31) shares a group of medium-temperature evaporative condensers (2).

4. A large temperature difference heat pump unit according to claim 3, characterized in that: The number of the heat circulation pipelines (51) corresponds to the number of the second circulation pipelines (31).

5. A large temperature difference heat pump unit according to any one of claims 1 to 4, characterized in that: Along the refrigerant conveying direction, the low-temperature evaporator (1), the centrifugal low-temperature compressor (211), the medium-temperature evaporative condenser (2) and the low-temperature expansion valve (212) are arranged in sequence to form a first circulation pipeline (21).

6. A large temperature difference heat pump unit according to any one of claims 1 to 4, characterized in that: The refrigerant in the first circulation pipeline (21) is R134a type refrigerant.

7. A large temperature difference heat pump unit according to any one of claims 1 to 4, characterized in that: The refrigerant in the second circulation pipeline (31) is R245fa refrigerant or R1233zd refrigerant.

8. A large temperature difference heat pump unit according to any one of claims 1 to 4, characterized in that: The high-temperature medium at the hot end (5) passes through the steam flash drum and the water heat exchanger in sequence and then returns to the heat circulation pipeline (51) for recycling.

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