Ultra-long gravity assisted heat pipe direct-driven refrigerating system applied to deep mine

Abstract

The utility model discloses a super-long gravity assisted heat pipe direct-driven refrigerating system applied to a deep mine, which relates to a deep mine refrigerating technology and mainly comprises a super-long gravity assisted heat pipe, an air cooler, a heat pump compressor, a condenser and an oil separation device. The evaporation section of the super-long gravity heat pipe extends to a mine tunneling layer, the air cooler is connected with the bottom of the super-long gravity heat pipe through a pipeline, and heat in mine air is transferred to a heat pipe working medium to be evaporated. And the heat pump compressor compresses the gaseous working medium into high-temperature and high-pressure steam, the high-temperature and high-pressure steam is conveyed to the condenser to be condensed, and next circulation is carried out. The ultra-long gravity heat pipe drives circulation of the internal refrigeration working medium through the steam pressure difference and the gravity effect, an extra pump is not needed to serve as a power source of working medium circulation, underground equipment is simplified, and the system efficiency is improved. In addition, an oil separation device arranged in the system can effectively separate engine oil, and stable operation of circulation is ensured.

Description

Technical Field

[0001] The utility model relates to a deep mine refrigeration technology, in particular to an ultra-long gravity heat pipe direct-driven refrigeration system applied to deep mines. Background Art

[0002] With the gradual depletion of shallow mineral resources, advancements in mining technology, and increased mining capacity, the global mining industry is shifting its focus to deeper layers to meet the growing demand for resources. As mining depth increases, the temperature of the surrounding rock within the mine increases, creating an increasingly serious problem of heat damage. The high temperatures encountered in deep-shaft mining have become one of the major technical challenges in mining production.

[0003] High temperatures not only pose a serious threat to miners' health, leading to fatigue, decreased efficiency, and occupational diseases, but also significantly increase the probability of accidents and exacerbate the wear and tear of mining equipment. Excessive temperatures can cause equipment failures, interrupt production, and even endanger the overall safety of the mine. Therefore, addressing high temperatures and creating a suitable working environment have become critical tasks for ensuring the safety and efficiency of deep-shaft mining.

[0004] The level of technology used to manage heat damage in mines directly determines the depth and economic viability of a mine. Failure to effectively control underground temperatures will significantly hinder the extraction of deep-level resources. Therefore, developing efficient and cost-effective heat damage management technologies is crucial for improving deep-well mining capacity and ensuring safe mine production.

[0005] Current mainstream mine cooling technology typically relies on surface-mounted refrigeration units to transport low-temperature cooling downhole to control the working face temperature. This solution is technically mature and widely used. However, as mines deepen, the cooling source must be transported over long distances, resulting in significant cooling losses and failing to achieve the desired cooling effect. Furthermore, while placing the refrigeration unit underground shortens the cooling source transmission distance, it also presents the challenge of condensation heat dissipation. Due to the enclosed underground space, heat dissipation efficiency is low, compromising the overall cooling effect.

[0006] On the other hand, the unique environment of deep mines places higher demands on refrigeration systems. To improve heat exchange efficiency, specialized heat exchange equipment must be installed. However, this equipment is not only costly but also generates energy losses during the heat exchange process, further reducing system efficiency. Overall, the application of traditional refrigeration solutions in deep mines faces numerous technical bottlenecks, including cold source transmission losses, heat removal difficulties, and low energy efficiency of heat exchange equipment. This makes improving mine refrigeration technology a pressing issue. Utility Model Content

[0007] In response to at least one shortcoming in the prior art, the present invention provides an ultra-long gravity heat pipe direct-drive refrigeration system for use in deep mines. The gaseous working medium flows to the top of the heat pipe due to the steam pressure difference, while the liquid working medium flows to the bottom due to gravity. No additional pump needs to be installed during the process, which greatly simplifies the underground refrigeration equipment. The system can be applied to deep mines and has a high cooling efficiency.

[0008] To achieve the above purpose, the present invention can adopt the following technical solutions:

[0009] An ultra-long gravity heat pipe direct-drive refrigeration system, comprising:

[0010] an extra-long gravity heat pipe, at least the bottom of which extends into the mine;

[0011] an air cooler, which is disposed in the mine and exchanges heat with the bottom of the ultra-long gravity heat pipe;

[0012] A heat pump compressor and a condenser, wherein the upstream pipeline of the heat pump compressor is connected to the top outlet of the ultra-long gravity heat pipe, the downstream pipeline of the heat pump compressor is connected to the upstream pipeline of the condenser, and the downstream pipeline of the condenser is connected to the top inlet of the ultra-long gravity heat pipe;

[0013] The heat pipe working fluid absorbs heat at the bottom of the ultra-long gravity heat pipe to form a gaseous working fluid. The gaseous working fluid flows upward and flows out at the top outlet of the ultra-long gravity heat pipe. The outflowing gaseous working fluid is compressed by the heat pump compressor and transported to the condenser. After being condensed into liquid working fluid in the condenser, it is returned to the top inlet of the ultra-long gravity heat pipe, and the cycle is repeated continuously.

[0014] The ultra-long gravity heat pipe direct-drive refrigeration system as described above further includes a gas-liquid separator, which is arranged on the pipeline connecting the upstream pipeline of the heat pump compressor and the top outlet of the ultra-long gravity heat pipe.

[0015] The ultra-long gravity heat pipe direct-drive refrigeration system as described above further includes a first oil separation device and a first oil cache tank, the upstream pipe of the first oil separation device is connected to the bottom outlet of the ultra-long gravity heat pipe, the downstream pipe of the first oil separation device is connected to the upstream pipe of the first oil cache tank, and the downstream pipe of the first oil cache tank is connected to the gas-liquid separator.

[0016] As described above, the ultra-long gravity heat pipe direct-drive refrigeration system further comprises a first oil booster pump provided on the pipeline between the first oil separation device and the first oil buffer tank.

[0017] The ultra-long gravity heat pipe direct-drive refrigeration system as described above further includes a second oil separation device and a second oil cache tank. The second oil separation device is arranged in a pipeline between the heat pump compressor and the condenser. The upstream pipeline of the second oil cache tank is connected to the second oil separation device, and the downstream pipeline of the second oil cache tank is connected to the gas-liquid separator.

[0018] As described above, the ultra-long gravity heat pipe direct-drive refrigeration system, further, the pipeline between the second oil separation device and the second oil buffer tank is further provided with a second oil boost pump.

[0019] The ultra-long gravity heat pipe direct-drive refrigeration system as described above further includes a throttle valve, which is arranged on the pipeline connecting the downstream pipeline of the condenser and the top inlet of the ultra-long gravity heat pipe.

[0020] The ultra-long gravity heat pipe direct-drive refrigeration system as described above further includes an explosion-proof axial flow fan. The bottom of the ultra-long gravity heat pipe extends into the excavation layer of the mine, and the explosion-proof axial flow fan is arranged in the excavation layer of the mine.

[0021] The ultra-long gravity heat pipe direct-drive refrigeration system as described above, further, the oil buffer tank is provided with an observation port for observing the oil storage amount.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. By effectively combining ultra-long gravity heat pipes with air coolers, underground equipment configuration is simplified. Ultra-long gravity heat pipes transport the refrigerant, eliminating the need for additional drive equipment and reducing operating costs. Compared to other deep mine refrigeration technologies, this utility model uses direct-drive refrigeration technology. The refrigeration equipment and ultra-long gravity heat pipes in the system use the same refrigerant, eliminating the need for additional heat exchange equipment. This reduces equipment investment and cooling losses during the heat exchange process, improving system energy efficiency and reducing system operating costs.

[0024] 2. The utility model adopts an oil separation device to effectively separate the heat pump compressor oil in the heat pipe working medium, and stores and transports it to the heat pump compressor inlet, reducing the interference of the heat pump compressor oil on the system performance; a gas-liquid separator is provided to prevent the heat pump compressor from being mechanically damaged by the impact caused by the inhalation of liquid heat pump working medium, thereby ensuring the long-term stability and reliability of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0026] Figure 1 It is a structural schematic diagram of an embodiment of the present utility model.

[0027] The meanings of the reference numerals in the figure are: 1. Extra-long gravity heat pipe; 201. First oil separation device; 202. First oil booster pump; 203. First oil buffer tank; 3. Air cooler; 4. Explosion-proof axial flow fan; 5. Gas-liquid separator; 6. Heat pump compressor; 701. Second oil separation device; 702. Second oil booster pump; 703. Second oil buffer tank; 8. Condenser; 9. Throttle valve. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0029] Example:

[0030] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present invention described herein can be implemented in an order other than those illustrated or described herein. In addition, the terms "including" and "having" in the embodiments of the present invention and any variations thereof are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0031] In the description of this utility model, "plurality" means at least two, such as two or three, unless otherwise specifically defined. Furthermore, unless otherwise specified or defined, the terms "mounted," "connected," and "connected" should be understood broadly, meaning, for example, fixed, removable, or integral; mechanical or electrical; direct or indirect through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model in their respective contexts.

[0032] See also Figure 1 An ultra-long gravity heat pipe direct-drive refrigeration system includes: an ultra-long gravity heat pipe 1, an air cooler 3, a heat pump compressor 6, and a condenser 8. Specifically, the ultra-long gravity heat pipe 1 extends at least to the bottom into the mine; the air cooler 3 is disposed in the mine and performs heat exchange with the bottom of the ultra-long gravity heat pipe 1; the upstream pipe of the heat pump compressor 6 is connected to the top outlet of the ultra-long gravity heat pipe 1, the downstream pipe of the heat pump compressor 6 is connected to the upstream pipe of the condenser 8, and the downstream pipe of the condenser 8 is connected to the top inlet of the ultra-long gravity heat pipe 1; wherein the heat pipe working fluid absorbs heat at the bottom of the ultra-long gravity heat pipe 1 to form a gaseous working fluid, which flows upward and flows out of the top outlet of the ultra-long gravity heat pipe 1. The flowing gaseous working fluid is compressed by the heat pump compressor 6 and transported to the condenser 8. After being condensed into a liquid working fluid in the condenser 8, it is reinjected into the top inlet of the ultra-long gravity heat pipe 1, and the cycle is repeated continuously.

[0033] In practice, the ultra-long gravity heat pipe 1 can be flexibly deployed within existing ventilation shafts within the mine system, or at a suitable location based on actual conditions, depending on the specific structure and ventilation requirements of the mine. This flexible deployment allows the system to adapt to the complex environment within the mine to the greatest extent possible, while fully utilizing the existing ventilation system for coordinated cooling.

[0034] Among them, by effectively combining the ultra-long gravity heat pipe 1 with the air cooler 3, the underground equipment configuration is simplified. The ultra-long gravity heat pipe 1 is used to transport the refrigerant, and no other driving equipment is required, which reduces operating costs. Compared with other deep mine refrigeration technologies, this utility model adopts direct-drive refrigeration technology. The refrigeration equipment and the ultra-long gravity heat pipe 1 in the system use the same working fluid, and no additional heat exchange equipment is required, which reduces equipment investment and cooling loss during the heat exchange process, improves system energy efficiency, and reduces system operating costs.

[0035] In certain embodiments, a gas-liquid separator 5 is further included, which is disposed on a pipeline connecting the upstream pipeline of the heat pump compressor 6 and the top outlet of the ultra-long gravity heat pipe 1. In a specific implementation, the gas-liquid separator 5 is used to separate the gaseous heat pipe working fluid, preventing the heat pump compressor 6 from being mechanically damaged by the impact caused by the inhalation of liquid heat pump working fluid, thereby ensuring the long-term stability and reliability of the system. The gaseous heat pipe working fluid is then mixed with the engine oil of the heat pump compressor 6 and transported to the inlet of the heat pump compressor 6.

[0036] In certain embodiments, a first oil separation device 201 and a first oil buffer tank 203 are further included, wherein the upstream pipeline of the first oil separation device 201 is connected to the bottom outlet of the ultra-long gravity heat pipe 1, the downstream pipeline of the first oil separation device 201 is connected to the upstream pipeline of the first oil buffer tank 203, and the downstream pipeline of the first oil buffer tank is connected to the gas-liquid separator 5. In a specific implementation, the first oil separation device 201 is used to separate the oil of the heat pump compressor 6 contained in the heat pipe working fluid, and store and transport it to the inlet of the heat pump compressor 6. Furthermore, the pipeline between the first oil separation device 201 and the first oil buffer tank 203 is also provided with a first oil boost pump 202. In a specific implementation, the first oil boost pump 202 is used to inject the separated oil of the heat pump compressor 6 into the first oil buffer tank 203, and provide the necessary pressure to maintain the stable operation of the system.

[0037] In certain embodiments, a second oil separation device 701 and a second oil buffer tank 703 are further included. The second oil separation device 701 is arranged in the pipeline between the heat pump compressor 6 and the condenser 8. The upstream pipeline of the second oil buffer tank 703 is connected to the second oil separation device 701, and the downstream pipeline of the second oil buffer tank 703 is connected to the gas-liquid separator 5. In a specific implementation, the second oil separation device 701 is used to separate the oil of the heat pump compressor 6 contained in the heat pipe working medium, and store and transport it to the inlet of the heat pump compressor 6. Furthermore, a second oil boost pump 702 is also provided in the pipeline between the second oil separation device 701 and the second oil buffer tank 703. In a specific implementation, the second oil boost pump 702 is used to inject the separated oil of the heat pump compressor 6 into the second oil buffer tank 703, and provide the necessary pressure to maintain the stable operation of the system.

[0038] In some embodiments, a throttle valve 9 is further included, which is disposed on a pipeline connecting the downstream pipeline of the condenser 8 and the top inlet of the ultra-long gravity heat pipe 1. In a specific implementation, the throttle valve 9 is used to adjust the fluid flow rate in the pipeline connecting the downstream pipeline of the condenser 8 and the top inlet of the ultra-long gravity heat pipe 1.

[0039] In some embodiments, an explosion-proof axial flow fan 4 is further included. The bottom of the ultra-long gravity heat pipe 1 extends into the mine's excavation layer, and the explosion-proof axial flow fan 4 is installed in the mine's excavation layer. In a specific implementation, the explosion-proof axial flow fan 4 is installed in the excavation layer to enhance heat exchange between the air in the underground mine and the air cooler 3 through forced convection heat exchange, thereby enhancing the cooling effect.

[0040] In some embodiments, the oil buffer tank is equipped with an observation port for observing the oil storage amount. In a specific implementation, the oil storage amount of the heat pump compressor 6 in the oil buffer tank can be observed through the observation port to control the start and stop of the oil booster pump.

[0041] As a preferred example, Figure 1 The present invention shows an ultra-long gravity heat pipe direct-drive refrigeration system for deep mines, which may include: a ground heat pump module, an ultra-long gravity heat pipe, an underground refrigeration module and an oil separation device. The ground heat pump module includes a heat pump compressor 6, a condenser 8 and a throttle 9; the underground refrigeration module includes an air cooler 3 and an explosion-proof axial flow fan 4; the oil separation device includes a first oil separation device 201, a first oil booster pump 202, a first oil buffer tank 203, a second oil separation device 701, a second oil booster pump 702, a second oil buffer tank 703 and a gas-liquid separator 5.

[0042] Among them, the heat pipe working fluid absorbs heat from the underground environment through the air cooler 3 at the bottom of the ultra-long gravity heat pipe 1 and evaporates into a gaseous working fluid, flows upward to the top of the ultra-long gravity heat pipe 1, is heated and pressurized by the heat pump compressor 6, and is transported to the condenser 8 for condensation and liquefaction into a liquid working fluid, and then is injected back into the ultra-long gravity heat pipe 1 through the throttle valve 9. The liquid heat pipe working fluid flows back to the bottom of the ultra-long gravity heat pipe 1 for the next cycle.

[0043] The steam at the top of the ultra-long gravity heat pipe 1 is directly transported to the heat pump compressor 6 without the need for heat exchange with other equipment or media.

[0044] An oil separator is provided in the underground refrigeration module, and an oil separator is provided at the connection between the bottom of the ultra-long gravity heat pipe 1 and the air cooler 3 to separate the heat pump compressor oil from the liquid heat pipe working fluid. The liquid heat pipe working fluid separated by the oil separator is transported to the air cooler 3. The oil separator also includes a first oil booster pump 202 and a first oil buffer tank 203. The oil booster pump pumps the separated heat pump compressor oil into the first oil buffer tank 203. The first oil buffer tank 203 is connected to the gas-liquid separator 5 via a pipeline, where it is mixed with the gaseous heat pump working fluid and enters the heat pump compressor 6.

[0045] An oil separator is provided in the above-ground heat pump module, and a second oil separator 701 is provided at the connection between the heat pump compressor 6 and the condenser 8 for separating the heat pump compressor oil from the gaseous heat pipe working fluid. The gaseous heat pipe working fluid separated by the oil separator is transported to the condenser 8. The oil separator also includes a second oil booster pump 702 and a second oil buffer tank 703. The oil booster pump injects the separated heat pump compressor oil into the second oil buffer tank 703. The second oil buffer tank 703 is connected to the gas-liquid separator 5 via a pipeline, where it is mixed with the gaseous heat pump working fluid and enters the heat pump compressor 6.

[0046] Among them, the oil separation device can effectively separate the heat pump compressor oil mixed in the liquid heat pipe working fluid and the gaseous heat pump working fluid, can effectively recover the oil and improve the operating efficiency of the refrigeration system.

[0047] The first oil boost pump 202 and the second oil boost pump 702 can control the start and stop of the boost pump by observing the oil storage amount of the heat pump compressor in the first oil cache tank 203 and the second oil cache tank 703, thereby reducing the power consumption of the boost pump.

[0048] The top outlet of the ultra-long gravity heat pipe 1, the first oil buffer tank 203, and the second oil buffer tank 703 are connected to the gas-liquid separator 5 via pipelines. The gas-liquid separator 5 separates the gaseous heat pipe working fluid from the liquid heat pipe working fluid, preventing mechanical damage to the heat pump compressor 6 caused by the impact of the liquid heat pump working fluid. The gas-liquid separator 5 mixes the heat pump compressor oil delivered from the first oil buffer tank 203 and the second oil buffer tank 703 with the gaseous heat pipe working fluid and delivers it to the heat pump compressor 6.

[0049] The condenser 8 can be combined with other heat exchange equipment to utilize heat, such as providing heating to users.

[0050] The number, diameter, and length of the ultra-long gravity heat pipes 1 , the number of air coolers 3 , and the number of heat pump compressors 6 are selected according to the actual cooling load of the underground environment.

[0051] Among them, the ultra-long gravity heat pipe 1, air cooler 3, heat pump compressor 6, and condenser 8 all use the same working fluid, that is, the ultra-long gravity heat pipe direct-drive refrigeration system used in deep mines uses the same medium in the system during operation; the selection of heat pipe working fluid needs to consider multiple factors such as the actual underground environmental cooling load, price, and safety.

[0052] The air cooler 3 further includes an explosion-proof axial flow fan 4, which is combined with the air cooler 3 to enhance heat exchange between the air in the underground space and the air cooler 3 through forced convection.

[0053] The outer surface of the super-long gravity heat pipe 1 and the heat exchange circulation loop, or / and the outer surface are covered with thermal insulation materials to reduce the loss of cold and improve the energy efficiency of the system.

[0054] It can be seen that the utility model uses an extra-long gravity heat pipe to directly transport the heat in the underground mine space to the ground heat pump unit. During the transportation process, no pump is required to drive the working fluid flow in the heat pipe, which is energy-saving and efficient; no additional heat exchange process is required, the heat exchange efficiency is improved, and the system structure is simple.

[0055] As mining depths increase, deep mines face the severe challenge of high temperatures. Traditional refrigeration methods for deep mines require the use of power pumps to transport refrigerant to the mine floor or to transport the refrigerant, after absorbing heat, to surface units. This increases system power consumption. Ultra-long gravity heat pipes utilize internal heat pipe fluids, which flow toward the top of the pipe in gaseous form due to vapor pressure differences and to the bottom of the pipe in liquid form due to gravity. This process eliminates the need for pumps, effectively reducing system energy consumption and simplifying underground equipment.

[0056] In addition, in the process of heating and compressing the gaseous heat pipe working fluid, the heat pump compressor needs to be mixed with the heat pump compressor oil in order to reduce the resistance and friction between the compressor and ensure its sealing performance. However, the vaporization temperature of the oil is much higher than the vaporization temperature of the heat pipe working fluid. When the heat pipe working fluid is transported to the air cooler 3 via the ultra-long gravity heat pipe 1 to absorb heat and transform into a saturated gas, the oil will precipitate due to temperature changes, be transported to the ultra-long gravity heat pipe 1, and settle to the bottom of the heat pipe. This process causes the oil to gradually accumulate at the bottom of the heat pipe and in the air cooler 3, affecting the operating efficiency of the system, causing blockage, and resulting in loss and waste of oil.

[0057] To address this issue, the present invention installs a first oil separator 201 and a second oil separator 701 at the junction of the bottom of the ultra-long gravity heat pipe 1 and the air cooler 3, and at the junction of the heat pump compressor 6 and the condenser 8. These separators utilize the density difference between the heat pump compressor oil and the heat pipe working fluid for separation. The separated heat pump compressor oil is then re-injected into the inlet of the heat pump compressor 6 via a pipeline, ensuring that the heat pump compressor receives the required oil. This reduces the oil's impact on the ultra-long gravity heat pipe 1 and air cooler 3, improving the efficiency and reliability of the system's circulation.

[0058] It should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0059] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0060] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0061] The above embodiments are intended only to illustrate the technical concepts and features of the present invention. Their purpose is to enable those skilled in the art to understand the contents of the present invention and implement them accordingly. They are not intended to limit the scope of protection of the present invention. Any equivalent changes or modifications based on the essence of the present invention are intended to be included in the scope of protection of the present invention.

Claims

1. An ultra-long gravity heat pipe direct-drive refrigeration system, characterized in that: include: an extra-long gravity heat pipe, at least the bottom of which extends into the mine; an air cooler, which is disposed in the mine and exchanges heat with the bottom of the ultra-long gravity heat pipe; A heat pump compressor and a condenser, wherein the upstream pipeline of the heat pump compressor is connected to the top outlet of the ultra-long gravity heat pipe, the downstream pipeline of the heat pump compressor is connected to the upstream pipeline of the condenser, and the downstream pipeline of the condenser is connected to the top inlet of the ultra-long gravity heat pipe.

2. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 1, characterized in that: It also includes a gas-liquid separator, which is arranged on a pipeline connecting the upstream pipeline of the heat pump compressor and the top outlet of the super-long gravity heat pipe.

3. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 2, characterized in that: It also includes a first oil separation device and a first oil cache tank. The upstream pipe of the first oil separation device is connected to the bottom outlet of the super-long gravity heat pipe, the downstream pipe of the first oil separation device is connected to the upstream pipe of the first oil cache tank, and the downstream pipe of the first oil cache tank is connected to the gas-liquid separator.

4. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 3, characterized in that: A first oil boost pump is further provided in the pipeline between the first oil separation device and the first oil buffer tank.

5. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 2, characterized in that: It also includes a second oil separation device and a second oil cache tank. The second oil separation device is arranged in a pipeline between the heat pump compressor and the condenser. The upstream pipeline of the second oil cache tank is connected to the second oil separation device, and the downstream pipeline of the second oil cache tank is connected to the gas-liquid separator.

6. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 5, characterized in that: A second oil boost pump is further provided in the pipeline between the second oil separation device and the second oil buffer tank.

7. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 1, characterized in that: It also includes a throttle valve, which is arranged on a pipeline connecting a downstream pipeline of the condenser and a top inlet of the super-long gravity heat pipe.

8. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 1, characterized in that: It also includes an explosion-proof axial flow fan. The bottom of the super-long gravity heat pipe extends into the excavation layer of the mine, and the explosion-proof axial flow fan is arranged in the excavation layer of the mine.

9. The ultra-long gravity heat pipe direct-drive refrigeration system according to claim 3 or 5, characterized in that: The oil buffer tank is equipped with an observation port for observing the oil storage amount.

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