Oil-free air source cold water heat pump unit

Abstract

The invention discloses an oil-free air source cold water heat pump unit which comprises a condenser, the condenser comprises a condensing cabinet internally provided with fins and radiating pipes, a fan is assembled at the top end of the condensing cabinet, and two oppositely distributed penetrating faces are arranged on the side wall of the condensing cabinet; fixing frames are fixed to the two penetrating faces of the condensing cabinet, plate frames are movably embedded in the fixing frames, first filter screens are assembled in the plate frames, the tops of the plate frames penetrate through the top walls of the fixing frames, and driving mechanisms used for driving the plate frames to ascend and descend are arranged on the fixing frames. And an ash scraping mechanism for scraping and cleaning the rising first filter screen is arranged at the top of the fixed frame. The air source cold water heat pump unit is reasonable in overall structure, has the automatic dust removal function and the oil return prevention performance, facilitates dust removal and scraper replacement, ensures efficient heat exchange of the condenser and improves the overall operation performance of the air source cold water heat pump unit.

Description

Technical Field

[0001] The invention relates to the technical field of cold water (heat pump), in particular to an oil-free air source cold water heat pump unit. Background Art

[0002] Air source chilled water heat pump unit, also known as air source heat pump or air-cooled heat pump unit, is a central air conditioning unit that uses the heat energy in the air for cooling or heating. It is mainly composed of compressor, four-way reversing valve, air side heat exchanger, water side heat exchanger, gas-liquid separator, liquid storage tank, dry filter, throttle valve and other components. In cooling mode, the unit absorbs heat from the air and transfers it to the water side heat exchanger through the refrigerant to reduce the water temperature and provide cold water; in heating mode, hot water is supplied through the reverse process.

[0003] With the increasing global concern about the energy crisis and environmental pollution, the demand for clean, efficient and energy-saving energy solutions in the industrial and civil fields is increasing. Air source heat pumps, with their energy-saving and environmentally friendly characteristics, have become one of the important ways to solve energy problems. Compared with traditional heating and cooling methods, air source heat pumps can significantly reduce energy consumption and reduce pollutant emissions, which meets the requirements of sustainable development. Therefore, they are widely used in industrial production, building heating and cooling and other fields. However, in actual applications, it is found that during the operation of the air source chilled water heat pump unit, the air flow around the condenser is large, and dust in the air can easily enter the condenser and adhere to the heat exchange fins, reducing the heat exchange efficiency of the condenser, thereby affecting the operating performance of the entire unit. For this reason, the present invention proposes an oil-free air source chilled water heat pump unit. Summary of the invention

[0004] The object of the present invention is to provide an oil-free air source chilled water heat pump unit with a reasonable overall structure, automatic dust cleaning function and anti-oil return performance, and easy dust cleaning and scraper replacement, thereby ensuring efficient heat exchange of the condenser and improving the overall operating performance of the air source chilled water heat pump unit.

[0005] To achieve the above object, the present invention provides the following technical solutions:

[0006] An oil-free air source chilled water heat pump unit comprises a condenser, wherein the condenser comprises a condensing cabinet with fins and heat dissipation pipes installed inside, a fan is installed on the top of the condensing cabinet, and two relatively distributed through surfaces are provided on the side wall of the condensing cabinet; a fixing frame is fixed on both through surfaces of the condensing cabinet, a plate frame is movably embedded in the fixing frame, a first filter is installed in the plate frame, the top of the plate frame passes through the top wall of the fixing frame, a driving mechanism for driving the plate frame to rise and fall is arranged on the fixing frame, and a scraping mechanism for scraping and cleaning the rising first filter is arranged on the top of the fixing frame.

[0007] Preferably, the fixing frame is configured as an inverted U-shaped structure, and the scraping mechanism includes a sleeve fixed to the top of the fixing frame away from the condensing cabinet and a scraper movably embedded in the sleeve, and the bottom of the scraper has a scraping blade abutting against the surface of the first filter.

[0008] Preferably, a card slot is provided on the sleeve plate, the card slot passes through the bottom of the sleeve plate, a rubber sleeve is glued to the inner wall of the card slot, and a card column capable of being embedded in the card slot is provided on the scraper.

[0009] Preferably, a side of the scraping blade facing the first filter screen is in contact with a surface of the first filter screen, and a side of the scraping blade away from the first filter screen is configured as an inclined surface.

[0010] Preferably, an ash tray is provided on a side of the bottom of the plate frame away from the condensing cabinet, and a baffle is provided on the bottom of the through-surface of the condensing cabinet.

[0011] Preferably, a movable strip is movably provided on one side of the ash tray away from the plate frame, and both ends of the movable strip are provided with blocks movably plugged with the side wall of the ash tray.

[0012] Preferably, the first filter is installed on a side of the plate frame away from the condensing cabinet, and a second filter is installed on a side of the plate frame facing the condensing cabinet, and the mesh number of the second filter is greater than the mesh number of the first filter.

[0013] Preferably, a base is provided at the bottom of the condenser, and ear blocks connected to the base and the condensing cabinet with bolts are provided at the bottom and top of the fixing frame.

[0014] Preferably, the driving mechanism includes a slider fixed to the bottom of the side wall of the plate frame, a driving slide groove provided on the opposite sides of the two vertical arms of the fixed frame, and a screw column vertically rotatably installed in the driving slide groove, the slider is slidably engaged with the driving slide groove, and the slider is threadedly sleeved with the screw column, an assembly groove is provided on the base, a driving motor for driving the screw column to rotate is installed in the assembly groove, and a guide groove that can accommodate the side wall of the plate frame to be embedded and slide is also provided on the opposite sides of the two vertical arms of the fixed frame.

[0015] Preferably, the oil-free air source chiller (heat pump) unit also includes a four-way valve, a vapor-liquid separator, an evaporator, a compression device, an expansion valve, a filter, a liquid reservoir, a low-pressure switch and a high-pressure switch, wherein the compression device is an oil-free compressor.

[0016] Compared with the prior art, the present invention has the following beneficial effects:

[0017] The present invention adopts an oil-free compressor through the compression equipment. Compared with the traditional compressor, no refrigerant oil is required in the compressor cylinder. The oil separator can be reduced in the refrigeration system, making the pipeline of the refrigeration system simpler, reducing the welding points of the pipeline, and reducing the risk of leakage. At the same time, it also avoids the dilemma of oil return and puts an end to various compressor failures caused by poor oil return. During the operation of the unit, the discharged refrigerant does not contain oil and gas, thereby ensuring the purity of the refrigerant, and preventing the refrigerant oil from generating an oil film inside the heat exchanger, affecting the effective heat exchange between the heat exchanger and the fluid, and causing the heat transfer coefficient of the heat exchanger to decrease. The phenomenon ensures efficient heat exchange between the evaporator 4 and the condenser 1, and improves the overall operating performance of the air source chilled water heat pump unit. In addition, the unit will not generate oil mist and oil pollution when operating in an outdoor environment, thereby avoiding pollution to the environment and being more energy-saving and environmentally friendly.

[0018] The present invention can perform double filtering on the air flowing through the condensing cabinet by setting the first filter screen and utilizing the first filter screen and the second filter screen in the plate frame, thereby effectively filtering out dust impurities in the air, preventing dust impurities from entering the condensing cabinet and adhering to the fins to affect the heat exchange efficiency, and ensuring efficient heat exchange of the condenser. The first filter screen is driven up by the driving mechanism, and during the rising process of the first filter screen, the scraping blade at the bottom of the scraper can scrape off the dust filtered out from the surface of the first filter screen, thereby achieving scraping and cleaning of the first filter screen, thereby ensuring that the condensing cabinet penetrates the surface The air circulation at the place ensures efficient heat exchange of the condenser and improves the performance of the unit. The dust scraped off by the scraper can fall into the ash tray for collection. After driving the plate frame down, the unit can run again. The movable strips can be pulled out of the ash tray to quickly remove the dust in the ash tray. The scraper can be plugged in and replaced by connecting the card column and the card slot. The overall structure is reasonable, with automatic dust cleaning function, and it is easy to clean the dust and replace the scraper, ensuring efficient heat exchange of the condenser and improving the overall operating performance of the air source chilled water heat pump unit.

[0019] Of course, any product implementing the present invention does not necessarily need to achieve all of the advantages described above at the same time. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0021] Figure 2 It is a structural schematic diagram of the condenser of the present invention;

[0022] Figure 3 It is a structural schematic diagram of the fixing frame and the plate frame of the present invention;

[0023] Figure 4 For the present invention Figure 2 A in the enlarged view;

[0024] Figure 5 It is a structural schematic diagram of the plate frame of the present invention;

[0025] Figure 6 It is a schematic diagram of the internal structure of the plate frame of the present invention;

[0026] Figure 7 For the present invention Figure 3 The enlarged view of point B in the figure;

[0027] Figure 8 It is a schematic diagram of the end structure of the scraper of the present invention;

[0028] Fig. 9 For the present invention Figure 5 Enlarged view of point C in the figure.

[0029] In the figure: 1. condenser; 2. four-way valve; 3. vapor-liquid separator; 4. evaporator; 5. compression equipment; 6. expansion valve; 7. filter; 8. liquid storage tank; 9. low-pressure switch; 10. high-pressure switch; 11. condensing cabinet; 12. base; 13. baffle; 14. fixing frame; 15. plate frame; 16. first filter screen; 17. scraper mechanism; 18. driving mechanism; 19. second filter screen; 20. fan; 21. protective mesh cover; 22. ash tray; 23. guide groove; 24. driving slide groove; 25. screw column; 26. ear block; 27. assembly groove; 28. driving motor; 29. ​​sleeve plate; 30. scraper; 31. scraper blade; 32. card slot; 33. card column; 34. rubber sleeve; 35. movable strip plate; 36. card block; 37. slider. DETAILED DESCRIPTION

[0030] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as limiting the present invention. The following describes various embodiments of the present invention in detail in conjunction with the drawings.

[0031] Example

[0032] See also Figures 1 to 9 , the present invention preferably provides a technical solution:

[0033] An oil-free air source chilled water heat pump unit comprises a condenser 1, a four-way valve 2, a vapor-liquid separator 3, an evaporator 4, a compression device 5, an expansion valve 6, a filter 7, a liquid reservoir 8, a low-pressure switch 9 and a high-pressure switch 10, wherein the compression device 5 is an oil-free compressor, the condenser 1, the four-way valve 2, the vapor-liquid separator 3, the evaporator 4, the compression device 5, the expansion valve 6, the filter 7, the liquid reservoir 8, the low-pressure switch 9 and the high-pressure switch 10 constitute an air source chilled water (heat pump) unit, which can use the heat energy in the air for cooling or heating to meet the needs of cooling and heating, wherein the compression device 5 adopts an oil-free compressor. Compared with a traditional compressor, no refrigeration oil is required in the compressor cylinder, and the compressor cylinder is used for heating. The oil separator can be reduced in the refrigeration system, making the refrigeration system pipeline more concise, reducing the welding points of the pipeline, and reducing the risk of leakage. At the same time, it also avoids the dilemma of oil return and prevents various compressor failures caused by poor oil return. During the operation of the unit, the discharged refrigerant does not contain oil and gas, ensuring the purity of the refrigerant, and preventing the refrigeration oil from forming an oil film inside the heat exchanger, affecting the effective heat exchange between the heat exchanger and the fluid, and causing the heat transfer coefficient of the heat exchanger to decrease. This ensures efficient heat exchange between the evaporator 4 and the condenser 1, and improves the overall operating performance of the air source chilled water heat pump unit. In addition, the unit will not generate oil mist and oil stains when operating in an outdoor environment, avoiding pollution to the environment, and is more energy-saving and environmentally friendly.

[0034] In a further embodiment, the condenser 1 includes a condensing cabinet 11 with fins and heat pipes installed inside, a fan 20 is installed on the top of the condensing cabinet 11, a protective mesh cover 21 is installed on the top of the fan 20, and the side wall of the condensing cabinet 11 has two relatively distributed through surfaces; a fixing frame 14 is fixed on the two through surfaces of the condensing cabinet 11, a plate frame 15 is movably embedded in the fixing frame 14, a first filter 16 is installed in the plate frame 15, the first filter 16 is installed on the side of the plate frame 15 away from the condensing cabinet 11, and a second filter 19 is installed on the side of the plate frame 15 facing the condensing cabinet 11, and the mesh number of the second filter 19 is greater than the mesh number of the first filter 16. During the operation of the unit, the fan 20 on the top of the condensing cabinet 11 is started, and the air is pumped into and flows through the condensing cabinet 11 from the penetration surface of the condensing cabinet 11, and heat is exchanged with the fins and heat pipes in the condensing cabinet 11. In this process, the first filter 16 and the second filter 19 in the plate frame 15 can be used to perform double filtration on the air flowing through the condensing cabinet 11, effectively filtering out dust and impurities in the air, preventing dust and impurities from entering the condensing cabinet 11 and adhering to the fins to affect the heat exchange efficiency, thereby ensuring efficient heat exchange of the condenser 1 and further improving the overall operating performance of the oil-free air source chilled water heat pump unit.

[0035] In a further embodiment, the top of the plate frame 15 passes through the top wall of the fixing frame 14, and a driving mechanism 18 for driving the plate frame 15 to rise and fall is provided on the fixing frame 14. A scraping mechanism 17 for scraping and cleaning the rising first filter 16 is provided on the top of the fixing frame 14. The fixing frame 14 is configured as an inverted U-shaped structure. The scraping mechanism 17 includes a sleeve plate 29 fixed to the top of the fixing frame 14 away from the condensing cabinet 11 and a scraper 30 movably embedded in the sleeve plate 29, and the bottom of the scraper 30 has a scraping blade 31 abutting against the surface of the first filter 16.

[0036] In this embodiment, the driving mechanism 18 includes a slider 37 fixed to the bottom of the side wall of the plate frame 15, a driving slot 24 provided on the opposite sides of the two vertical arms of the fixed frame 14, and a screw 25 vertically rotatably installed in the driving slot 24. The slider 37 is slidably engaged with the driving slot 24, and the slider 37 is threadedly sleeved with the screw 25. The base 12 is provided with an assembly slot 27, and a driving motor 28 for driving the screw 25 to rotate is installed in the assembly slot 27. The two vertical arms of the fixed frame 14 are also provided on the opposite sides. A guide groove 23 is provided in which the side wall of the plate frame 15 can be embedded and slide. The drive motor 28 is started to drive the screw column 25 to rotate. The screw column 25 drives the slider 37 to drive the plate frame 15 and the first filter screen 16 to rise. During the rising process of the first filter screen 16, the scraping blade 31 at the bottom of the scraper 30 can scrape off the dust filtered out from the surface of the first filter screen 16, so as to scrape and clean the first filter screen 16, thereby ensuring the air circulation at the through-surface of the condensing cabinet 11, that is, ensuring the efficient heat exchange of the condenser 1 and improving the performance of the unit.

[0037] In this embodiment, a slot 32 is provided on the sleeve 29, the slot 32 runs through the bottom of the sleeve 29, a rubber sleeve 34 is glued to the inner wall of the slot 32, and a post 33 capable of being inserted into the slot 32 is provided on the scraper 30, and the scraper 30 can be replaced by plugging and unplugging. The scraper blade 31 contacts the first filter screen 16 with one side facing the first filter screen 16, and the scraper blade 31 is arranged as an inclined surface away from the first filter screen 16, so that the dust on the rising first filter screen 16 can be scraped and cleaned more effectively.

[0038] In this embodiment, an ash tray 22 is provided on the side of the bottom of the plate frame 15 away from the condensing cabinet 11, and a movable strip 35 is movably provided on the side of the ash tray 22 away from the plate frame 15. Both ends of the movable strip 35 are provided with blocks 36 movably plugged with the side wall of the ash tray 22. The dust scraped by the scraper 31 can fall into the ash tray 22 for collection. The movable strip 35 is pulled away from the ash tray 22 to quickly remove the dust in the ash tray 22. A baffle 13 is provided at the bottom of the through surface of the condensing cabinet 11 for blocking water.

[0039] In this embodiment, a base 12 is provided at the bottom of the condenser 1 , and ear blocks 26 connected to the base 12 and the condensing cabinet 11 with bolts are provided at the bottom and top of the fixing frame 14 for assembling and fixing the fixing frame 14 .

[0040] When in use, the condenser 1, the four-way valve 2, the vapor-liquid separator 3, the evaporator 4, the compression device 5, the expansion valve 6, the filter 7, the liquid storage 8, the low-pressure switch 9 and the high-pressure switch 10 constitute an air source chiller (heat pump) unit, which can use the heat energy in the air for cooling or heating to meet the needs of cooling and heating. The compression device 5 adopts an oil-free compressor. Compared with the traditional compressor, no refrigerant oil is used in the compressor cylinder. The oil separator can be reduced in the refrigeration system, making the pipeline of the refrigeration system simpler, reducing the welding points of the pipeline, and reducing the risk of leakage. It also avoids the dilemma of oil return and prevents various compressor failures caused by poor oil return. During the operation of the unit, the discharged refrigerant does not contain oil and gas, ensuring the purity of the refrigerant and preventing the refrigeration oil from producing an oil film inside the heat exchanger, affecting the effective heat exchange between the heat exchanger and the fluid, and causing the heat transfer coefficient of the heat exchanger to decrease. It ensures efficient heat exchange between the evaporator 4 and the condenser 1 and improves the overall operating performance of the air source chilled water heat pump unit. In addition, the unit will not generate oil mist and oil stains when operating in an outdoor environment, avoiding pollution to the environment and being more energy-saving and environmentally friendly.

[0041] Furthermore, during the operation of the unit, the fan 20 on the top of the condensing cabinet 11 is started, and the air is pumped into and flows through the condensing cabinet 11 from the penetration surface of the condensing cabinet 11, and heat is exchanged with the fins and heat pipes in the condensing cabinet 11. In this process, the first filter 16 and the second filter 19 in the plate frame 15 can be used to perform double filtration on the air flowing through the condensing cabinet 11, effectively filtering out dust and impurities in the air, preventing dust and impurities from entering the condensing cabinet 11 and adhering to the fins to affect the heat exchange efficiency, thereby ensuring efficient heat exchange of the condenser 1 and further improving the overall operating performance of the oil-free air source chilled water heat pump unit. By starting the driving motor 28 to drive the screw 25 to rotate, the screw 25 drives the slider 37 to drive the plate frame 15 and the first filter 16 to rise. During the rising process of the first filter 16, the scraper blade 31 at the bottom of the scraper 30 can scrape off the dust filtered out of the surface of the first filter 16, so as to scrape and clean the first filter 16, thereby ensuring the air flow at the through-surface of the condensing cabinet 11, that is, ensuring the efficient heat exchange of the condenser 1 and improving the performance of the unit. Among them, the dust scraped off by the scraper blade 31 can fall into the ash tray 22 for collection. After driving the plate frame 15 to descend, the unit can be operated again, and the movable strip 35 can be pulled out of the ash tray 22 to quickly remove the dust in the ash tray 22. The scraper 30 can be plugged in and replaced by the clamping connection between the clamping column 33 and the clamping slot 32. The overall structure is reasonable, with automatic dust cleaning function, and it is convenient to clean the dust and replace the scraper 30, ensuring the efficient heat exchange of the condenser 1 and improving the overall operation performance of the air source chilled water heat pump unit.

[0042] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. There are many ways of detachable installation, for example, it can be through the method of plug-in and snap-on matching, and for example, through the method of bolt connection, etc.

[0043] The above clearly and completely describes the concept, specific structure and technical effects of the present invention in combination with the embodiments and drawings, so as to fully understand the purpose, characteristics and effects of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, other embodiments obtained by technicians in this field without creative work are all within the scope of protection of the present invention. In addition, all the connection / connection relationships mentioned in the text do not refer to the direct connection of components, but refer to the fact that a better connection structure can be formed by adding or reducing connection accessories according to the specific implementation situation.

[0044] The specific description of the present invention in the above embodiments is only used to further illustrate the present invention and cannot be understood as limiting the scope of protection of the present invention. Technical engineers in this field may make some non-essential improvements and adjustments to the present invention based on the contents of the above invention, which fall within the scope of protection of the present invention.

Claims

1. An oil-free air-source chilled water heat pump unit, comprising a condenser (1), characterized in that: The condenser (1) comprises a condensing cabinet (11) with fins and heat dissipation pipes installed inside, a fan (20) is installed on the top of the condensing cabinet (11), and the side wall of the condensing cabinet (11) has two oppositely distributed through surfaces; A fixing frame (14) is fixed on both through surfaces of the condensing cabinet (11), a plate frame (15) is movably embedded in the fixing frame (14), a first filter screen (16) is installed in the plate frame (15), the top of the plate frame (15) passes through the top wall of the fixing frame (14), a driving mechanism (18) for driving the plate frame (15) to rise and fall is arranged on the fixing frame (14), and a scraping mechanism (17) for scraping and cleaning the rising first filter screen (16) is arranged on the top of the fixing frame (14).

2. The oil-free air-source chilled water heat pump unit according to claim 1, characterized in that: The fixing frame (14) is configured as an inverted U-shaped structure, and the scraping mechanism (17) comprises a sleeve (29) fixed to a side of the top of the fixing frame (14) away from the condensing cabinet (11), and a scraper (30) movably embedded in the sleeve (29), wherein the bottom of the scraper (30) has a scraping blade (31) that abuts against the surface of the first filter screen (16).

3. The oil-free air-source chilled water heat pump unit according to claim 2, characterized in that: The sleeve plate (29) is provided with a slot (32) which passes through the bottom of the sleeve plate (29). A rubber sleeve (34) is glued to the inner wall of the slot (32). The scraper (30) is provided with a post (33) which can be embedded in the slot (32).

4. The oil-free air-source chilled water heat pump unit according to claim 3, characterized in that: The scraping blade (31) has a side facing the first filter screen (16) in surface contact with the first filter screen (16), and the side of the scraping blade (31) away from the first filter screen (16) is arranged as an inclined surface.

5. The oil-free air-source chilled water heat pump unit according to claim 1, characterized in that: An ash tray (22) is provided at a side of the bottom of the plate frame (15) away from the condensing cabinet (11), and a baffle (13) is provided at the bottom of the penetrating surface of the condensing cabinet (11).

6. The oil-free air-source chilled water heat pump unit according to claim 5, characterized in that: A movable strip plate (35) is movably provided on one side of the ash tray (22) away from the plate frame (15), and clamping blocks (36) movably plugged into the side wall of the ash tray (22) are provided at both ends of the movable strip plate (35).

7. The oil-free air-source chilled water heat pump unit according to claim 1, characterized in that: The first filter screen (16) is mounted on a side of the plate frame (15) away from the condensing cabinet (11), and a second filter screen (19) is mounted on a side of the plate frame (15) facing the condensing cabinet (11), wherein the mesh number of the second filter screen (19) is greater than the mesh number of the first filter screen (16).

8. The oil-free air-source chilled water heat pump unit according to claim 2, characterized in that: The bottom of the condenser (1) is provided with a base (12), and the bottom and top of the fixing frame (14) are provided with ear blocks (26) which are bolted to the base (12) and the condensing cabinet (11).

9. The oil-free air-source chilled water heat pump unit according to claim 8, characterized in that: The driving mechanism (18) comprises a slider (37) fixed to the bottom of the side wall of the plate frame (15), a driving slide groove (24) provided on the opposite sides of the two vertical arms of the fixed frame (14), and a threaded column (25) vertically rotatably installed in the driving slide groove (24), the slider (37) and the driving slide groove (24) are slidably engaged, and the slider (37) and the threaded column (25) are threadedly sleeved, the base (12) is provided with an assembly groove (27), and a driving motor (28) for driving the threaded column (25) to rotate is installed in the assembly groove (27), and the two vertical arms of the fixed frame (14) are also provided with a guide groove (23) capable of accommodating the side wall of the plate frame (15) to be embedded and slide.

10. The oil-free air-source chilled water heat pump unit according to claim 1, characterized in that: The oil-free air source chiller (heat pump) unit further comprises a four-way valve (2), a vapor-liquid separator (3), an evaporator (4), a compression device (5), an expansion valve (6), a filter (7), a liquid storage device (8), a low-pressure switch (9) and a high-pressure switch (10), wherein the compression device (5) is an oil-free compressor.

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