Air supply device of pneumatic equipment

Abstract

The utility model discloses a gas supply device of pneumatic equipment. The gas supply device comprises a reciprocating compressor, a fluid distribution piece, an oil-gas separation assembly, a recirculation device and a one-way valve. Wherein the fluid distribution part divides an oil-gas mixture discharged by the compressor into two paths, oil of a main pipeline enters the oil-gas separation assembly to be separated, separated gas is output through the one-way valve to provide a power source for the gas supply equipment, and the separated oil flows back to the compressor; oil in the branch pipeline directly flows back through the recirculation device, and a pressure buffering channel is formed to adjust the load of the compressor. And the recycling device and an oil discharge outlet of the oil-gas separation assembly are both communicated with an oil inlet of the compressor, and oil liquid recycling is achieved. According to the device, through the double-path shunting arrangement, the air supply cleanliness is guaranteed, the oil liquid recovery efficiency is improved, the oil liquid high-temperature oxidation risk is reduced, the service life of the compressor is prolonged, and the problems that a traditional single path is low in separation efficiency and insufficient in oil liquid recovery are solved.

Description

Technical Field

[0001] This utility model relates to the field of pneumatic equipment technology, and specifically to an air supply device for pneumatic equipment. Background Technology

[0002] In modern industrial production and the operation of various automated equipment, pneumatic equipment is widely used in many fields such as machinery manufacturing, automobile assembly, and food packaging due to its advantages such as rapid response, ease of operation, and zero pollution. As the core power source of pneumatic equipment, the performance of the air supply device directly affects the stability and reliability of the entire pneumatic system. Among them, reciprocating compressors have become the preferred equipment for many air supply devices due to their high-efficiency compression and low noise characteristics.

[0003] However, during operation, reciprocating compressors inevitably discharge internal refrigerant oil used for cooling and lubrication along with the compressed gas. If this refrigerant oil cannot be effectively recovered and recycled, it will not only waste oil and increase operating costs, but also lead to problems such as accelerated wear, decreased efficiency, and even damage to the compressor due to oil shortage. Currently, existing oil-gas separation and oil recovery technologies suffer from defects such as incomplete separation, low recovery efficiency, complex structure, and inconvenient maintenance, making it difficult to achieve efficient recovery and precise circulation of refrigerant oil. Although some devices have oil-gas separation functions, the separated oil cannot reliably flow back to the compressor, resulting in poor oil circulation; some oil-gas separation components, due to unreasonable design, have poor adaptability to different operating conditions and cannot meet diverse usage needs. Therefore, developing a pneumatic air supply device that can efficiently separate oil and gas and stably achieve oil recycling has become an urgent technical problem to be solved. Utility Model Content

[0004] Therefore, this utility model provides an air supply device for pneumatic equipment to solve the above-mentioned problems in the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution:

[0006] According to a first aspect of the present invention, an air supply device for a pneumatic device includes:

[0007] A reciprocating compressor has an oil inlet and an oil outlet;

[0008] A fluid distribution component, the oil inlet of which is connected to the oil outlet of the reciprocating compressor;

[0009] An oil-gas separation assembly, the oil inlet of which is connected to the main pipeline outlet of the fluid distribution component;

[0010] The recirculation device has its inlet connected to the outlet of the branch pipe of the fluid distribution unit;

[0011] A one-way valve is provided at the outlet of the oil-gas separation component;

[0012] The oil outlet of the recirculation device and the oil outlet of the oil-gas separation component are both connected to the oil inlet of the reciprocating compressor.

[0013] Furthermore, the oil-gas separation assembly includes a housing, a first filter screen, a second filter screen, and a first solenoid valve;

[0014] The housing is a hollow chamber that provides space for oil-gas separation. The oil inlet of the oil-gas separation component is located in the middle of the hollow chamber, and the oil inlet of the oil-gas separation component communicates with the hollow chamber.

[0015] The filter screen is detachably mounted on the top of the hollow chamber, and the air outlet of the oil-gas separation component is connected to the top of the hollow chamber.

[0016] The second filter screen is detachably installed at the bottom of the hollow chamber, and the oil outlet of the oil-gas separation component is connected to the bottom of the hollow chamber;

[0017] The oil outlet of the oil-gas separation component is connected to the oil inlet of the first solenoid valve, and the oil outlet of the first solenoid valve is connected to the oil inlet of the reciprocating compressor.

[0018] Furthermore, the mesh size and mesh density of the second filter screen are both greater than those of the first filter screen.

[0019] Furthermore, it also includes a baffle plate disposed on the inner wall of the hollow chamber, the baffle plate dividing the hollow chamber into a first chamber and a second chamber, the bottoms of the first chamber and the second chamber being interconnected, a first filter screen disposed on the top of the first chamber, the baffle plate and the bottom of the hollow chamber being spaced apart, and the second filter screen being located at the bottom of the baffle plate.

[0020] Furthermore, the filter screen two has an oil guide hole in the middle. When the power is off, the front end of the valve core of the solenoid valve one seals against the oil guide hole; when the power is on, the valve core and the oil guide hole separate, allowing the oil at the bottom of the hollow chamber to flow back into the reciprocating compressor.

[0021] Furthermore, the recirculation device includes a second solenoid valve and a pressure relief valve; the inlet of the second solenoid valve is connected to the oil drain port of the branch pipe of the fluid distribution component, the drain port of the second solenoid valve is connected to the inlet of the pressure relief valve, and the drain port of the pressure relief valve is connected to the inlet of the reciprocating compressor.

[0022] Furthermore, the fluid distribution component is a tee fitting, a multi-channel distributor, or a flow splitting structure integrated into the reciprocating compressor housing.

[0023] Furthermore, the oil inlet of the reciprocating compressor is also connected to an oil cooler for cooling the return oil.

[0024] This utility model has the following advantages:

[0025] This invention uses a fluid distribution component to divide the oil-gas mixture discharged from the reciprocating compressor into two paths. The main pipeline enters the oil-gas separation component for fine separation, while the branch pipeline uses a recirculation device to allow some oil to flow back directly. This ensures the cleanliness of the supplied air, improves the oil recovery efficiency, and extends the service life of the compressor.

[0026] When the reciprocating compressor is working, the mixture of compressed gas and refrigerant oil enters the fluid distributor through the oil drain port. The fluid distributor divides it into two paths: the main pipeline's oil-gas mixture enters the oil-gas separation component, where oil-gas separation is completed. The separated gas is output through a one-way valve for use by pneumatic equipment, while the separated oil flows back to the compressor's oil inlet; the oil in the branch pipeline flows directly back to the compressor through a recirculation device, forming a cycle. The one-way valve prevents gas backflow and ensures the stability of the gas supply system.

[0027] When the reciprocating compressor is started, the oil-gas mixture is split by the fluid distributor and enters the oil-gas separation component and the recirculation device respectively. The separated gas is delivered to the pneumatic equipment through a one-way valve, while the separated oil and the oil from the recirculation device flow back to the compressor inlet, realizing the recycling of oil.

[0028] In traditional gas supply systems, the oil-gas mixture typically undergoes only a single separation path, resulting in limited separation efficiency and insufficient oil recovery. This invention addresses this by implementing a dual-path recovery system, utilizing fluid distribution components to divert and process the oil-gas mixture. The precise separation in the main pipeline ensures the cleanliness of the output gas, while the direct return flow in the branch pipeline reduces the residence time of the oil in the separation components, lowering the risk of oil oxidation due to high temperatures, thereby improving the overall system efficiency and reliability. Attached Figure Description

[0029] To more clearly illustrate the embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings in the following description are merely exemplary, and those skilled in the art can derive other embodiments based on the provided drawings without creative effort.

[0030] The structures, proportions, sizes, etc. illustrated in this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed herein, and are not intended to limit the implementation conditions of this utility model. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size, without affecting the effects and objectives that this utility model can produce, should still fall within the scope of the technical content disclosed in this utility model.

[0031] Figure 1 This is a perspective view of an air supply device for a pneumatic equipment provided in some embodiments of the present utility model.

[0032] Figure 2 An exploded view of an air supply device for a pneumatic equipment provided in some embodiments of this utility model.

[0033] Figure 3 This is a perspective view of an oil-gas separation assembly provided in some embodiments of the present invention.

[0034] Figure 4 This is a front view of an oil-gas separation assembly provided in some embodiments of the present invention.

[0035] Figure 5 This is a cross-sectional view of an oil-gas separation assembly provided in some embodiments of the present invention.

[0036] Figure 6 Provided for some embodiments of this utility model Figure 5 Enlarged view of part A.

[0037] Figure 7 This is a schematic diagram of a filter screen provided in some embodiments of the present invention.

[0038] Figure 8 This is a schematic diagram of a filter screen 2 provided in some embodiments of the present invention.

[0039] Figure 9 Another schematic diagram of a reciprocating compressor provided for some embodiments of this utility model.

[0040] In the picture:

[0041] 1. Reciprocating compressor; 2. Main pipeline; 3. Branch pipeline; 4. Check valve; 5. Housing; 6. Filter screen one; 7. Filter screen two; 701. Oil guide hole; 8. Solenoid valve one; 801. Valve core; 9. Baffle plate; 901. Chamber one; 902. Chamber two; 10. Solenoid valve two. Detailed Implementation

[0042] The following specific embodiments illustrate the implementation of this utility model. Those skilled in the art can easily understand other advantages and effects of this utility model from the content disclosed in this specification. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0043] like Figures 1 to 8 As shown, an air supply device for a pneumatic device according to a first aspect embodiment of the present invention includes:

[0044] The reciprocating compressor 1 has an oil inlet and an oil outlet;

[0045] A fluid distribution component, the oil inlet of which is connected to the oil outlet of the reciprocating compressor 1;

[0046] The oil-gas separation component has its oil inlet connected to the oil outlet of the main pipeline 2 of the fluid distribution component, which accounts for 80%-90% of the flow.

[0047] The recirculation device has its oil inlet connected to the oil outlet of the branch pipe 3 of the fluid distribution component. The branch pipe 3 accounts for 10%-20% of the flow and serves as a pressure buffer channel to adjust the load of the reciprocating compressor 1 in real time.

[0048] One-way valve 4 is located at the outlet of the oil-gas separation component, which provides a power source for starting the equipment.

[0049] The oil drain ports of the recirculation unit and the oil-gas separation component are both connected to the oil inlet of the reciprocating compressor 1.

[0050] 1. Compressor type

[0051] Compressor type reciprocating compressor Rated voltage frequency 220-240V~50Hz refrigerant R600a Applicable Low back pressure (LBP) Cooling state Natural cooling Throttling device capillary Motor type RSIR running capacitor none

[0052] 2. Working conditions

[0053] Ambient temperature 0～43℃ Evaporation temperature -35～-15℃ Voltage range 187～254V Maximum exhaust pressure 0.87 MPa (abs) Maximum condensation temperature 65℃ Maximum winding temperature rise 120℃ Maximum casing temperature 95℃ Maximum exhaust temperature 110℃ Starting performance 187V [0.3 / 0.3Mpa(abs)] Minimum pressure resistance of the housing 2.5Mpa

[0054] 3. Compressor Mechanical Guide

[0055]

[0056] 4. Electrical characteristics

[0057] type reciprocating compressor Electrical Wiring Diagram (RSIR) Insulation class "B”130℃ Maximum starting current 13A Electrical safety Conforms to GB4706.17 / IEC335-2-34

[0058] It should be noted that the oil-gas mixture discharged from the reciprocating compressor 1 is divided into two paths by the fluid distribution component. The main pipeline 2 enters the oil-gas separation component for fine separation, while the branch pipeline 3 achieves direct return of some oil through the recirculation device. This not only ensures the cleanliness of the supplied air but also improves the oil recovery efficiency and extends the service life of the compressor.

[0059] When the reciprocating compressor 1 is working, the mixture of compressed gas and refrigeration oil enters the fluid distribution unit through the oil drain port. The fluid distribution unit divides it into two paths: the oil-gas mixture in the main pipeline 2 enters the oil-gas separation component, where oil-gas separation is completed. The separated gas is output through the one-way valve 4 for use by pneumatic equipment, while the separated oil flows back to the compressor inlet; the oil in the branch pipeline 3 flows directly back to the compressor through the recirculation device, forming a cycle. The one-way valve 4 is designed to prevent gas backflow and ensure the stability of the gas supply system.

[0060] When the reciprocating compressor 1 is started, the oil-gas mixture is split by the fluid distributor and enters the oil-gas separation component and the recirculation device respectively. The separated gas is delivered to the pneumatic equipment through the one-way valve 4, while the separated oil and the oil from the recirculation device flow back to the compressor inlet, realizing the recycling of oil.

[0061] In traditional gas supply systems, the oil-gas mixture typically undergoes only a single separation path, resulting in limited separation efficiency and insufficient oil recovery. This invention addresses this issue by implementing a dual-path recovery system, utilizing fluid distribution components to divert and process the oil-gas mixture. The fine separation in the main pipeline 2 ensures the cleanliness of the output gas, while the direct return flow in the branch pipeline 3 reduces the residence time of the oil in the separation components, lowering the risk of oil oxidation due to high temperatures, thereby improving the overall system efficiency and reliability.

[0062] As an optional embodiment of this utility model, such as Figures 2 to 6 As shown, the oil-gas separation assembly includes a housing 5, a first filter screen 6, a second filter screen 7, and a first solenoid valve 8. The housing 5 is a hollow chamber that provides space for oil-gas separation. The oil inlet of the oil-gas separation assembly is located in the middle of the hollow chamber and is connected to the hollow chamber. The first filter screen 6 is detachably installed at the top of the hollow chamber, and the air outlet of the oil-gas separation assembly is connected to the top of the hollow chamber. The second filter screen 7 is detachably installed at the bottom of the hollow chamber, and the oil outlet of the oil-gas separation assembly is connected to the bottom of the hollow chamber. The oil outlet of the oil-gas separation assembly is connected to the oil inlet of the first solenoid valve, and the oil outlet of the first solenoid valve is connected to the oil inlet of the reciprocating compressor 1.

[0063] It should be noted that after the oil-gas mixture enters the hollow chamber from the middle of shell 5, larger oil droplets settle directly to the bottom under gravity. Smaller oil droplets rise with the airflow, are intercepted and aggregated by the top filter screen 6, and flow back to the bottom. The separated gas is discharged from the top outlet, providing a power source for gas supply equipment such as pneumatic nail guns and brick / tile vacuum extruders. The oil at the bottom is further filtered for impurities by filter screen 7 and then flows back to the compressor inlet under the control of solenoid valve 1. During normal operation, solenoid valve 1 is energized, valve core 801 separates from oil guide hole 701, and oil can flow back freely. When maintenance or repair is required, solenoid valve 1 is closed, and valve core 801 seals oil guide hole 701 to prevent oil leakage. Filter screens 6 and 7 should be disassembled periodically for cleaning or replacement to ensure separation efficiency. By using filter screen 6 to intercept smaller oil droplets and filter screen 7 to filter impurities, the separation efficiency is significantly improved. The solenoid valve enables controllable oil backflow, avoids disordered oil flow, and improves system stability.

[0064] As an optional embodiment of this utility model, such as Figure 7 and Figure 8 As shown, filter screen 7 has a larger mesh size and mesh density than filter screen 6. Filter screen 6 has a looser mesh structure, while filter screen 7, with its finer and more compact mesh, achieves higher filtration accuracy. Filter screen 6 has approximately 60% fewer meshes per inch than filter screen 7, resulting in a larger effective flow area. Filter screen 7, with its higher mesh count and denser mesh arrangement, has a significantly higher proportion of fluid passages per unit area due to its larger mesh size and finer mesh. Filter screen 7, with its thicker mesh and denser mesh, has a lower open area ratio and improved filtration accuracy. Filter screen 6, with its larger mesh size and lower density, experiences less pressure loss and higher flow efficiency. Filter screen 7, with its finer mesh and higher density, achieves finer filtration, but with relatively increased flow resistance.

[0065] It should be noted that filters 6 and 7 are typically circular sheet structures. By setting the mesh size and density of filter 7 to be larger than those of filter 6, staged filtration of the oil is achieved, ensuring separation efficiency and extending the service life of the filters. The small pore size and high density design of filter 6 effectively intercepts tiny oil droplets, ensuring the cleanliness of the output gas. The large pore size and low density design of filter 7 are mainly used to filter impurities in the oil, preventing impurities from entering the compressor, while also avoiding excessive oil flow resistance due to excessively small mesh size. After the oil-gas mixture enters the hollow chamber, it first passes through the fine filtration of filter 6 to separate oil droplets from the gas. After the oil settles to the bottom, it passes through the impurity filtration of filter 7 and finally flows back to the compressor. Regularly check the clogging of filters 6 and 7, and clean or replace them as needed. If the mesh size and density of filter 7 are the same as those of filter 6, it will lead to increased oil flow resistance and affect the system's operating efficiency. By using a multi-stage filtration system, filter screen 6 focuses on oil droplet separation, while filter screen 7 focuses on impurity filtration. This not only improves separation efficiency but also reduces the risk of filter screen clogging and extends their service life.

[0066] An oil guide hole 701 is provided in the middle of filter screen 2 7. When power is off, the front end of the valve core 801 of solenoid valve 1 seals against the oil guide hole 701. When power is on, the valve core 801 and the oil guide hole 701 separate, allowing the oil at the bottom of the hollow chamber to flow back into the reciprocating compressor 1. By providing an oil guide hole 701 in the middle of filter screen 2 7 and cooperating with the valve core 801 of solenoid valve 1, automatic sealing is achieved when power is off, preventing oil leakage and improving system safety. During normal operation, solenoid valve 1 is energized, the valve core 801 is lifted and separated from the oil guide hole 701, allowing oil to flow back to the compressor through the oil guide hole 701 and solenoid valve 1. When the system is powered off, solenoid valve 1 is de-energized, and the valve core 801 falls under the action of spring force, sealing against the oil guide hole 701 and preventing further oil flow. No special operation is required during normal system operation. When maintenance or a sudden power outage is required, solenoid valve 1 automatically closes to prevent oil leakage. After maintenance is completed and power is restored, solenoid valve 1 reopens, restoring oil backflow. In the event of a power outage, without an automatic sealing device, oil may continue to flow, leading to leakage and potential environmental contamination. This invention achieves automatic sealing during power outages through the cooperation of solenoid valve 1 and the oil guide hole 701, improving the system's safety and reliability.

[0067] As an optional embodiment of this utility model, in addition to the above, such as Figure 5As shown, it also includes a baffle plate 9, which is disposed on the inner wall of the hollow chamber. The baffle plate 9 divides the hollow chamber into a first chamber 901 and a second chamber 902. The bottoms of the first chamber 901 and the second chamber 902 are connected to each other. A first filter screen 6 is disposed on the top of the first chamber 901. The baffle plate 9 and the bottom of the hollow chamber are spaced apart. A second filter screen 7 is located at the bottom of the baffle plate 9.

[0068] It should be noted that by setting baffle 9, the flow path of the oil-gas mixture within the hollow chamber is extended, increasing the settling time of oil droplets and further improving the oil-gas separation efficiency. Baffle 9 divides the hollow chamber into chamber one 901 and chamber two 902. After entering chamber two 902, the oil-gas mixture needs to bypass the bottom of baffle 9 before entering chamber one 901. During this process, oil droplets have more time to settle to the bottom. The separated gas is discharged from filter screen one 6 at the top of chamber one 901, while the oil is collected in the area of ​​filter screen two 7 through the bottom connection. After entering the hollow chamber, the oil-gas mixture flows along the path formed by baffle 9, completing the oil-gas separation. The fixation of baffle 9 should be checked regularly to ensure its separation effect. A straight-flowing oil-gas mixture has a short residence time in the hollow chamber, resulting in insufficient oil droplet settling. The setting of baffle 9 changes the airflow direction, extends the flow path, and gives oil droplets more opportunities to collide with the inner wall of the chamber and settle, thereby improving the separation efficiency.

[0069] As an optional embodiment of this utility model, the recirculation device includes a second solenoid valve 10 and a pressure relief valve (not shown in the figure); the inlet of the second solenoid valve 10 is connected to the oil outlet of the branch pipe 3 of the fluid distribution component, the outlet of the second solenoid valve 10 is connected to the inlet of the pressure relief valve, and the outlet of the pressure relief valve is connected to the inlet of the reciprocating compressor 1.

[0070] It should be noted that the recirculation device, consisting of solenoid valve 210 and a pressure relief valve, achieves precise control of the oil flow rate and pressure protection in branch line 3, preventing system overload. The oil in branch line 3 first enters solenoid valve 210, which controls the oil flow rate and on / off state according to system requirements. When the oil pressure exceeds the set value, the pressure relief valve automatically opens to release excess pressure and ensure system pressure stability. After adjustment and pressure protection, the oil flows back to the compressor inlet. Precise control of the oil flow rate is achieved by adjusting the opening of solenoid valve 210 according to the compressor's operating status and oil demand. The pressure relief valve's operating status is checked regularly to ensure it opens normally when the pressure is too high. Excessive or insufficient oil flow rate in branch line 3 will affect the normal operation of the compressor. Solenoid valve 210 enables precise flow control, while the pressure relief valve provides pressure protection to prevent system damage due to excessive pressure. Together, they improve the system's stability and reliability.

[0071] As an optional embodiment of this utility model, the fluid distribution component can be a tee fitting, a multi-channel distributor, or a flow-dividing structure integrated into the housing of the reciprocating compressor 1. The user selects a suitable fluid distribution component based on the structure of the reciprocating compressor 1 and the application scenario of the air supply device. A tee fitting has a simple structure and is suitable for small air supply devices; a multi-channel distributor can achieve multiple flow paths and is suitable for complex systems; a flow-dividing structure integrated into the compressor housing reduces external connecting pipes, improving the system's compactness and reliability.

[0072] As an optional embodiment of this utility model, the oil inlet of the reciprocating compressor 1 is also connected to an oil cooler (not shown in the figure) for cooling the return oil. By setting up the oil cooler, the temperature of the return oil is reduced, ensuring the stability of the refrigeration oil performance and improving the cooling and lubrication effect of the compressor. The oil returning from the oil-gas separation component and recirculation device has a high temperature. When passing through the oil cooler, it exchanges heat with the cooling medium, and the temperature is reduced before entering the compressor oil inlet. The cooled oil can more effectively absorb the heat generated by the compressor while maintaining good lubrication performance. During the operation of the gas supply device, the oil cooler works continuously to cool the return oil. The cooling effect of the oil cooler and the liquid level of the cooling medium are checked regularly to ensure its normal operation. High temperature will cause the viscosity of the refrigeration oil to decrease, the lubrication performance to deteriorate, and accelerate the oxidation and deterioration of the oil. The setting of the oil cooler reduces the oil temperature, ensures the stability of the oil performance, thereby improving the cooling and lubrication effect of the compressor and extending the service life of the compressor.

[0073] Although the present invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of the present invention fall within the scope of protection claimed by the present invention.

[0074] The terms such as "upper," "lower," "left," "right," and "middle" used in this specification are merely for clarity of description and are not intended to limit the scope of implementation of this utility model. Any changes or adjustments to their relative relationships, without substantially altering the technical content, shall also be considered within the scope of implementation of this utility model.

Claims

1. A gas supply device for a pneumatic apparatus, characterized by, include: A reciprocating compressor (1) has an oil inlet and an oil outlet; A fluid distribution component, the oil inlet of which is connected to the oil outlet of the reciprocating compressor (1); The oil-gas separation component has its oil inlet connected to the oil outlet of the main pipeline (2) of the fluid distribution component; The recirculation device has its inlet connected to the outlet of the branch pipe (3) of the fluid distribution component; A one-way valve (4) is provided at the outlet of the oil-gas separation assembly; The oil outlet of the recirculation device and the oil outlet of the oil-gas separation component are both connected to the oil inlet of the reciprocating compressor (1).

2. An air supply for a pneumatic device according to claim 1, wherein The oil-gas separation assembly includes a housing (5), a first filter screen (6), a second filter screen (7), and a first solenoid valve (8); The housing (5) is a hollow chamber used to provide space for oil-gas separation. The oil inlet of the oil-gas separation component is located in the middle of the hollow chamber, and the oil inlet of the oil-gas separation component is connected to the hollow chamber. The filter screen (6) is detachably installed on the top of the hollow chamber, and the outlet of the oil-gas separation component is connected to the top of the hollow chamber. The filter screen 2 (7) is detachably installed at the bottom of the hollow chamber, and the oil outlet of the oil-gas separation component is connected to the bottom of the hollow chamber; The oil outlet of the oil-gas separation component is connected to the oil inlet of the solenoid valve, and the oil outlet of the solenoid valve is connected to the oil inlet of the reciprocating compressor (1).

3. An air supply for a pneumatic device according to claim 2, wherein The mesh size and mesh density of the second filter screen (7) are both greater than those of the first filter screen (6).

4. The air supply device of claim 2, wherein It also includes a baffle plate (9), which is disposed on the inner wall of the hollow chamber. The baffle plate (9) divides the hollow chamber into a first chamber (901) and a second chamber (902). The bottoms of the first chamber (901) and the second chamber (902) are connected to each other. The first filter screen (6) is disposed on the top of the first chamber (901). The baffle plate (9) and the bottom of the hollow chamber are spaced apart. The second filter screen (7) is located at the bottom of the baffle plate (9).

5. The air supply device of claim 2, wherein The filter screen 2 (7) has an oil guide hole (701) in the middle. When the power is off, the front end of the valve core (801) of the solenoid valve 1 is sealed against the oil guide hole (701). When the power is on, the valve core (801) and the oil guide hole (701) separate, so that the oil at the bottom of the hollow chamber flows back into the reciprocating compressor (1).

6. The air supply device of claim 1, wherein The recirculation device includes a second solenoid valve (10) and a pressure relief valve; the inlet of the second solenoid valve (10) is connected to the oil outlet of the branch pipe (3) of the fluid distribution component, the outlet of the second solenoid valve (10) is connected to the inlet of the pressure relief valve, and the outlet of the pressure relief valve is connected to the inlet of the reciprocating compressor (1).

7. The air supply device of claim 1, wherein The fluid distribution component is a three-way pipe fitting, a multi-channel distributor, or a flow splitting structure integrated on the housing of the reciprocating compressor (1).

8. The air supply device of claim 1, wherein The reciprocating compressor (1) is also connected to an oil cooler at its oil inlet for cooling the return oil.

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