Maintenance-free air compressor

Abstract

The invention provides a maintenance-free air compressor, and belongs to the technical field of air compressors. The technical problem that an existing air compressor needs manual drainage is solved. The maintenance-free air compressor comprises an air storage tank, a motor and a machine head, the motor comprises a rotating shaft, an air cylinder, a cylinder cover, a crankshaft and a piston are arranged in the machine head, the rotating shaft is fixedly connected with the crankshaft, the crankshaft drives the piston to move up and down in the air cylinder, an air inlet hole and an air outlet hole are formed in the cylinder cover, and the air outlet hole is communicated with an inflation seat and inflates the air storage tank. A connecting hole is formed in the top of the gas storage tank, a sealing plug is fixedly connected into the connecting hole, one end of the sealing plug is fixedly connected with a first water pipe, the first water pipe extends to the bottom of the gas storage tank, and the other end of the sealing plug is connected with a drainer through a second water pipe; one end of the drainer is connected with an evaporation basin through a third water pipe, and the evaporation basin is fixed to the side close to the motor. According to the invention, a complete maintenance-free scheme is formed by the self-cleaning of the filtering system without user intervention.

Description

Technical Field

[0001] The present invention relates to the technical field of air compressors, in particular to a maintenance-free air compressor. Background Art

[0002] The medical air compressor industry places extremely stringent demands on compressed gas cleanliness, long-term equipment reliability, and operational stability. Medical gases, which directly or indirectly affect patients, must be free of oil contamination, and the equipment must operate continuously, quietly, and stably within the medical environment.

[0003] In the prior art, for example, the Chinese patent application number 2018110890402 discloses “a medical oil-free scroll variable frequency air compressor”, whose core advantage lies in the use of an oil-free scroll compression main unit and a permanent magnet synchronous motor, in conjunction with variable frequency control technology. This solution integrates the oil-free scroll compression main unit, permanent magnet synchronous motor and gas storage tank on a mounting frame, and sets an air filter and a one-way valve at the air inlet end, equips the gas storage tank with a pressure gauge, an electronic drain valve and an exhaust ball valve, and uses the built-in pressure sensor of the gas storage tank to link the variable frequency controller, thereby realizing automatic start and stop of the motor according to the set pressure threshold to maintain constant pressure output. This design effectively ensures the cleanliness of the gas, and realizes constant pressure and constant current output at the terminal through variable frequency control. It also has the characteristics of low noise and low vibration, making it basically adaptable to the needs of the medical environment.

[0004] However, air filters, the first line of defense for ensuring air cleanliness, are exposed to ambient air for extended periods. After approximately 500 hours of use, the filter element accumulates adsorbed contaminants, increasing intake resistance and reducing compression efficiency, necessitating replacement. Existing technologies rely entirely on manual inspection, removal, cleaning, or replacement of filter elements. This not only increases maintenance workload and downtime, but also creates the risk of reduced filtration efficiency, contaminants entering the system, and even compromising equipment performance due to untimely maintenance, reducing overall efficiency and reliability. Furthermore, as compressed air cools within the gas storage tank, it inevitably produces a large amount of condensate that settles to the tank bottom. Existing technologies typically require operators to manually drain the water at least once a day by opening an electronic drain valve or ball valve. Failure to do so promptly not only increases the effective storage volume and reduces equipment efficiency, but more importantly, significantly increases the humidity of the compressed air within the tank. Highly humid compressed air can cause instrument malfunctions, compromise treatment effectiveness, or breed microorganisms in medical settings, posing potential risks. This daily manual draining operation also increases maintenance costs and the potential for human error. Summary of the Invention

[0005] In response to the shortcomings of the existing technology, the present invention aims to provide a maintenance-free air compressor. The technical problem to be solved by the present invention is to overcome the high maintenance costs, high downtime risks, and uncontrolled medical gas humidity caused by the frequent manual replacement of the filter silencer in the air filter and the daily manual drainage of condensate from the gas storage tank in medical oil-free air compressors, thereby achieving maintenance-free operation of the equipment.

[0006] and a tube connecting the discharging opening of the pump with a plug in the forward end of the crank case, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, said tube having a check valve in it at the pump end, and said former tube which connects the pump to the oil drain plug, and said former tube which connects the pump to the oil drain plug. The sealing plug is sealed and fixedly connected to a water pipe quick connector, and the water pipe 1 and the water pipe 2 are connected through the water pipe quick connector. The water pipe 1 is a water pipe made of hard material.

[0007] The principle behind this solution is that a motor drives the crankshaft, which in turn drives the piston to reciprocate within the cylinder. As the piston descends, negative pressure forms within the cylinder, causing external air to pass through the filter-muffler, the cylinder head's intake port, and the intake valve on the valve plate before being drawn into the cylinder. As the piston ascends, the intake valve closes, compressing the drawn-in air. The increased pressure pushes open the outlet valve, and the compressed gas enters the air storage tank through the cylinder head's outlet port. When the air pressure in the air tank reaches a certain level, the pressure pushes a small amount of water at the bottom of the tank through pipes 1 and 2 into the drainer. The water in the drainer is then drained through pipe 3 to the evaporation basin. Due to the heat generated by the motor during operation and the small-scale vibration of the air compressor during operation, this vibration combined with the motor's residual heat accelerates the evaporation of the water in the drainer. Drainage continues throughout the compressor's inflation process, and the drainer automatically closes when there is no more water. This solution automatically drains any accumulated water from the air tank, effectively preventing internal corrosion, extending its life, and ensuring the dryness of the output compressed air. The entire drainage, water diversion, and evaporation process is fully automatic, requiring no user intervention. Together with the self-cleaning filtration system, this provides a complete, maintenance-free solution.

[0008] In this maintenance-free air compressor, the drainer has a water inlet at its top end, to which water pipe 2 is fixedly connected. A water outlet is located at its bottom end, which is fixedly connected to water pipe 3. A float valve is installed within the drainer to control the opening and closing of the outlet. When water accumulates in the drainer to a certain level, the float rises with the water level, opening the outlet and allowing drainage. When the water level drops, the float drops, closing the drain. This ensures that the drainer automatically closes when there's no water, preventing gas leakage, and automatically opens when there's water, eliminating the need for manual intervention.

[0009] In the aforementioned maintenance-free air compressor, the drainer includes a housing chamber, a baffle fixedly connected to the housing chamber, the baffle being positioned opposite and below the water inlet. A partition plate is also provided on the inner wall of the drainer, with a water hole defined in the center thereof. The partition plate is positioned between the baffle plate and the water outlet, and the float valve abuts against or moves away from the water hole. The baffle plate comprises at least two spirally arranged blades, the blades stacked together to form no axial gap, and a spiral gap is provided between adjacent blades.

[0010] The baffle in this solution buffers and disperses the high-speed water flowing from the water inlet, preventing it from directly impacting the float or causing drastic water level fluctuations. This ensures the float can stably and accurately sense the actual water level, improving control reliability. A partition separates the chamber between the water inlet buffer zone and the float-controlled outlet area, with the water hole being the only channel connecting these two areas. The baffle is configured to consist of two or more spiral blades arranged in a spiral arrangement. The blades overlap to form a gap between adjacent blades, accelerating gas-liquid separation and better isolating disturbances from the water inlet. This results in a more stable water level in the control area where the float resides, unaffected by the transient impact of the incoming water flow, and more precise float movement. This reduces direct impact or interference from the incoming water flow on the float. The float valve acts directly on the water hole, closing with abutment and opening with distance, making the float valve more sensitive and precise.

[0011] In the above-mentioned maintenance-free air compressor, the filter silencer includes a shell, an air intake hole and a reverse blowing hole are formed on the shell, a filter silencer is arranged inside the shell, the outer end of the shell is fixedly connected to the filter cover, the air intake hole is fixedly connected to the air inlet hole, the reverse blowing hole is located between the air intake hole and the filter silencer, and the reverse blowing hole and the air outlet are connected through a solenoid valve.

[0012] After the air tank is filled with air, the air outlet and the air tank will be isolated by the solenoid valve. However, before the air compressor is started next time, the high-pressure air between the machine head and the air tank must be discharged. Therefore, when the air outlet and the air tank are closed, the existing technology adopts the method of directly discharging air from the air outlet.

[0013] This solution uses reverse-blowing holes to direct high-pressure gas from the outlet and cylinder back to the filter-muffler, blowing air in the opposite direction to remove dust and other contaminants accumulated on the filter-muffler's outer surface. This high-pressure reverse airflow effectively strips and removes dust and contaminants accumulated on the filter housing's outer surface, preventing them from clogging the filter-muffler and causing poor air intake, reduced efficiency, or equipment failure. This increases the filter-muffler's service life by three to four times. This automatic cleaning mechanism reduces the need for manual cleaning or replacement of the filter-muffler, enabling the air compressor to achieve maintenance-free or low-maintenance operation.

[0014] In the aforementioned maintenance-free air compressor, a blow-assist component is fixedly connected between the filter and silencer and the air intake port. The reverse air intake port is positioned opposite the blow-assist component and includes a blow-assist hole therein, which is in communication with the blow-assist hole. This blow-assist component facilitates reverse airflow. The inner wall of the housing is angled, securing the filter and silencer. This blow-assist component effectively removes and blows away dust and contaminants accumulated on the outer surface of the filter housing, preventing them from clogging the filter and silencer and causing air intake problems, reduced efficiency, or equipment failure.

[0015] In this maintenance-free air compressor, the blow-assist element has an annular hole recessed inwardly around its outer circumference. The openings of the reverse-blowing holes are located within these annular holes. One to three blow-assist holes are evenly distributed circumferentially on the sidewall of the blow-assist element, each communicating with the annular hole. Air entering the reverse-blowing hole enters the annular hole directly and is distributed to each of the blow-assist holes. These dispersed blow-assist holes effectively back-blow at every angle of the filter muffler, effectively stripping and removing dust and contaminants accumulated on the outer surface of the filter housing.

[0016] In the aforementioned maintenance-free air compressor, the blow-assist holes include a first circle of holes and a second circle of holes, the first circle of holes and the second circle of holes being arranged in a staggered arrangement, with the axis of the first circle of holes being arranged at an angle to the axis of the second circle of holes. The angled arrangement of the axis of the first circle of holes and the axis of the second circle of holes can cover the air inlet surface of the filter silencer. The airflows at different angles overlap and intertwine with each other, forming a more uniform, three-dimensional high-pressure airflow coverage network for the filter silencer, significantly increasing the effective sweeping area. The angled airflows act on the filter silencer at different positions and directions, generating more complex turbulence and shear forces, thereby more effectively stripping away and forcefully blowing away dust and contaminants accumulated on various locations on the outer surface of the filter silencer, significantly improving cleaning efficiency.

[0017] In the above-mentioned maintenance-free air compressor, the cylinder head is provided with an air inlet cavity and an air outlet cavity isolated from each other on the side facing the valve plate, the air inlet hole is connected to the air inlet cavity, and the air outlet hole is connected to the air outlet cavity. The cylinder head is also provided with an air return hole, and the air return hole is connected to the air outlet hole and the air inlet cavity.

[0018] This solution is another way to reverse blow the filter silencer, which is to guide the high-pressure gas from the head back to the air inlet chamber, and use the pressure difference to make the high-pressure gas flow toward the direction of the filter silencer with low air pressure, so as to further reverse blow and peel off the filter silencer and blow away the dust and pollutants accumulated on the outer surface of the filter cover, thereby increasing the service life of the filter silencer.

[0019] In the above maintenance-free air compressor, the filter silencer includes a shell, a filter silencer is fixedly arranged in the shell, an air intake hole and an air outlet are formed on the shell, and the filter silencer is located between the air intake hole and the air outlet.

[0020] In the aforementioned maintenance-free air compressor, the air outlet is connected to the inflation seat via air pipe 1, and the air return port is connected to air pipe 2, one end of which is connected to a solenoid valve, and one end of air pipe 1 is connected to the solenoid valve. The solenoid valve is controlled by the system assembly. When the high-pressure inflation of the air tank is completed, the solenoid valve receives a command to close the connection between air pipe 1 and the air tank, and simultaneously opens the connection between air pipe 2 and air pipe 1. Air pipe 2 then directs the high-pressure gas in air pipe 1 and the handpiece to the air intake chamber, achieving reverse blowing. This automatic cleaning mechanism significantly extends the service life of the filter and silencer, reducing the need for manual cleaning or replacement of the filter and silencer, thereby achieving maintenance-free or low-maintenance operation of the air compressor.

[0021] Compared with the existing technology, the technical effects of the present invention are as follows: First, the air pressure in the gas tank forces the condensed water at the bottom into the drainer through water pipes 1 and 2. When the water level is reached, the float valve opens the water hole, and the water flows into the evaporation basin through water pipe 3. The residual heat from the motor and the vibration of the entire machine cause the accumulated water in the evaporation basin to evaporate rapidly. The entire process requires no human intervention and is automatic and continuous, effectively preventing tank corrosion and ensuring gas dryness. Second, when the gas tank is fully inflated and the high pressure in the machine head needs to be released, this high-pressure gas is recycled and conducted through the solenoid valve. The high-pressure gas enters the annular hole of the blow-assist component through the reverse blow hole and is then ejected at high speed through the staggered blow-assist holes. This strong, uniform, multi-angle reverse airflow penetrates the filter and silencer, forcefully stripping and blowing away dust and pollutants accumulated on the external filter cover, significantly extending the life of the filter and silencer by 3 to 4 times and achieving self-cleaning. Third, after the solenoid valve is switched, the high-pressure gas within the engine head and air pipe 1 is no longer charged into the air tank. Instead, it is directed back to the cylinder head's intake chamber through air pipe 2 and the return port. The intake chamber connects to the interior of the filter-muffler through the intake port, creating a pressure differential. This causes the high-pressure gas to naturally flow to the low-pressure area, flowing in the opposite direction from the intake chamber through the intake port and out of the filter-muffler, thus achieving reverse purge cleaning of the filter-muffler and filter housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 This is a three-dimensional embodiment of the present invention Figure 1 .

[0023] Figure 2 This is a three-dimensional embodiment of the present invention Figure 2 .

[0024] Figure 3 It is a cross-sectional view of embodiment 1 of the present invention.

[0025] Figure 4 2 is a cross-sectional view of a drainer according to a first embodiment of the present invention.

[0026] Figure 5 This is an axial front view of the baffle of Example 1 of the present invention.

[0027] Figure 6 It is a partial cross-sectional view of embodiment 1 of the present invention.

[0028] Figure 7 It is a three-dimensional view of the cylinder head according to the first embodiment of the present invention.

[0029] Figure 8 It is a three-dimensional diagram of embodiment 2 of the present invention.

[0030] Figure 9 It is a cross-sectional view of the filter silencer according to the second embodiment of the present invention.

[0031] Figure 10 It is a three-dimensional diagram of the blowing-assisting member according to the second embodiment of the present invention.

[0032] Figure numbers: 1. Gas tank; 101. Inflating seat; 102. Exhaust seat; 103. Connecting hole; 2. Motor; 201. Rotating shaft; 3. Machine head; 301. Cylinder; 302. Cylinder head; 3021. Inlet hole; 3022. Exhaust hole; 3023. Inlet cavity; 3024. Exhaust cavity; 3025. Return hole; 303. Crankshaft; 304. Piston; 305. Valve plate; 4. Bracket; 5. Filter-muffler; 501. Housing; 5011. Inlet hole; 5012. Reverse blowing hole; 502. Filter-muffler element; 503, filter cover; 504, blowing aid; 505, blowing aid hole; 5051, first circle of holes; 5052, second circle of holes; 506, annular hole; 507, air hole; 6, sealing plug; 7, water pipe one; 8, water pipe two; 9, drainer; 901, water inlet hole; 902, water outlet hole; 903, float valve; 904, accommodating chamber; 905, baffle; 906, isolation plate; 907, water hole; 10, water pipe three; 11, evaporation basin; 12, solenoid valve; 13, air pipe one; 14, air pipe two; 15, water pipe quick connector. DETAILED DESCRIPTION

[0033] The following are specific embodiments of the present invention and the accompanying drawings to further describe the technical solutions of the present invention, but the present invention is not limited to these embodiments.

[0034] It should be noted that the descriptions of the present invention regarding directions such as "up", "down", "left", "right", "top" and "bottom" are all defined based on the relationships between the orientations or positions shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0035] Example 1: According to Figures 1 to 7 As shown, a maintenance-free air compressor includes an air tank 1, and the air tank 1 has an air filling seat 101 and an air outlet seat 102, and the air filling seat 101 and the air outlet seat 102 are connected to the air tank 1. The air outlet seat 102 is used to connect external components that use high-pressure gas. A bracket 4 is welded and fixedly connected to the air tank 1, and a motor 2 and a machine head 3 are fixed on the bracket 4. The motor 2 includes a rotating shaft 201, and a cylinder 301, a cylinder head 302, a crankshaft 303 and a piston 304 are arranged in the machine head 3. The rotating shaft 201 is fixedly connected to the crankshaft 303, and the crankshaft 303 drives the piston 304 to move up and down in the cylinder 301. A valve plate 305 is fixedly connected between the cylinder head 302 and the cylinder 301. There are an air inlet 3021 and an air outlet 3022 on the cylinder head 302, and the air outlet 3022 and The inflating seat 101 is connected to and inflates the gas tank 1. The filter-muffler 5 is fixedly connected to the air inlet 3021. The top of the gas tank 1 is provided with a connection hole 103, into which a sealing plug 6 is fixedly connected. One end of the sealing plug 6 is fixedly connected to a water pipe 7, the other end of which extends into the bottom of the gas tank 1. The other end of the sealing plug 6 is connected to a drainer 9 via a water pipe 8. One end of the drainer 9 is connected to an evaporation basin 11 via a water pipe 10. The evaporation basin 11 is fixed near one side of the motor 2. The sealing plug 6 is sealed and fixedly connected to a water pipe quick connector 15, which connects water pipe 7 and water pipe 2 8 via the water pipe quick connector 15. Water pipe 17 is made of a hard material. The evaporation basin 11 is fixed to the bracket 4 via a magnetic attraction.

[0036] The operating principle is that motor 2 drives crankshaft 303, which in turn drives piston 304 to reciprocate within cylinder 301. As piston 304 descends, negative pressure forms within cylinder 301. External air passes through filter-muffler 5, air inlet 3021 in cylinder head 302, and the inlet valve on valve plate 305, before being drawn into cylinder 301. As piston 304 ascends, the inlet valve closes, compressing the drawn-in air. The increased pressure pushes open the outlet valve, and the compressed gas enters air storage tank 1 through outlet 3022 in cylinder head 302 for storage. When the pressure in air tank 1 reaches a certain level, the pressure causes the small amount of water at the bottom of the tank to be forced through water pipes 1 7 and 2 8 into drain 9. The water in drain 9 is then drained through water pipe 3 10 to evaporation basin 11. Since motor 2 generates heat during operation and the air compressor vibrates slightly during operation, this vibration combined with the residual heat from motor 2 accelerates the evaporation of the water in drain 9. Drainage continues throughout the compressor's inflation process, and drain 9 automatically closes when no more water is available. This solution automatically drains any accumulated water from tank 1, effectively preventing internal corrosion, extending its lifespan, and ensuring the dryness of the output compressed air. The entire drainage, water diversion, and evaporation process is fully automated, requiring no user intervention. Together with the self-cleaning filtration system, this provides a complete, maintenance-free solution.

[0037] The drainer 9 has an inlet 901 at its top, to which water pipe 2 8 is fixedly connected. A water outlet 902 is located at its bottom, which is fixedly connected to water pipe 3 10. A float valve 903 is installed within the drainer 9 to control the opening and closing of the outlet 902. When the water in the drainer 9 reaches a certain level, the float rises with the water level, opening the outlet 902 and allowing the water to drain. When the water level drops, the float drops, closing the drain. This ensures that the drain automatically closes when there's no water, preventing gas leaks, and automatically opens when there's water, eliminating the need for manual intervention.

[0038] Drainer 9 contains a chamber 904, to which a baffle 905 is fixedly attached. Baffle 905 is positioned opposite and below the water inlet 901. Drainer 9 also features a partition 906 on its inner wall, with a water hole 907 located in the center. Baffle 906 is positioned between baffle 905 and outlet 902, with the float valve 903 positioned in contact with or away from the water hole 907. Baffle 905 comprises at least two spirally arranged blades, each stacked without axial gaps and with spiral gaps between adjacent blades. Baffle 905 buffers and disperses the high-speed water flowing from the water inlet 901, preventing it from directly impacting the float or causing drastic water level fluctuations. This ensures the float can stably and accurately sense the actual water level, improving control reliability. Baffle 906 separates chamber 904 into a buffer zone for water inflow and an outlet zone controlled by the float. Water hole 907 is the sole connection between these two zones. The baffle 905 is designed to be a spiral arrangement of two or more spiral blades. The stacked blades have no axial gaps, and adjacent blades have spiral gaps between them. This accelerates gas-liquid separation and better isolates disturbances from the water inlet. This stabilizes the water level in the control area where the float resides, unaffected by the transient impact of the incoming water flow, and allows for more precise float movement. This reduces direct impact or interference from the incoming water flow on the float. The float valve 903 acts directly on the water orifice 907, closing with contact and opening with distance, making it more sensitive and precise.

[0039] After the air compressor has completed filling the air tank 1, the air outlet 3022 is isolated from the air tank 1 by the solenoid valve 12. However, before the air compressor is started again, the high-pressure air between the machine head 3 and the air tank 1 must be vented. Therefore, when the air outlet 3022 and the air tank 1 are closed, the prior art adopts the method of directly discharging air from the air outlet 3022. In order to better maintain the filter silencer 5, this part of the high-pressure air can be recycled. On the side of the cylinder head 302 facing the valve plate 305, there are provided an air inlet chamber 3023 and an air outlet chamber 3024, which are isolated from each other. The air inlet 3021 is connected to the air inlet chamber 3023, and the air outlet 3022 is connected to the air outlet chamber 3024. The cylinder head 302 is also provided with an air return hole 3025, which connects the air outlet 3022 and the air inlet chamber 3023. The high-pressure gas from the handpiece 3 is directed back to the air inlet chamber 3023. The pressure differential is used to direct the high-pressure gas toward the filter silencer 502, where the air pressure is lower. This further removes dust and contaminants accumulated on the outer surface of the filter housing 503 by back-blowing, thereby extending the service life of the filter silencer 502. The filter silencer 502 includes a housing 501, within which the filter silencer 502 is fixedly mounted. The housing 501 is formed with an air intake hole 5011 and an air outlet hole 507, with the filter silencer 502 located between the air intake hole 5011 and the air outlet hole 507. The air outlet hole 507 draws in air from the outside and discharges the high-pressure gas. The air outlet 3022 is connected to the inflation seat 101 via air pipe 13. The air return hole 3025 is connected to air pipe 2 14. One end of air pipe 2 14 is connected to the solenoid valve 12, and one end of air pipe 13 is connected to the solenoid valve 12. The solenoid valve 12 is controlled by the system assembly. When the high-pressure inflation of the air tank 1 is completed, the solenoid valve 12 receives the instruction to close the connection between the air pipe 1 13 and the air tank 1, and at the same time opens the connection between the air pipe 2 14 and the air pipe 1 13. The air pipe 2 14 guides the high-pressure gas in the air pipe 1 13 and the machine head 3 to the air intake chamber 3023 to realize reverse blowing. Through this automatic and timely cleaning mechanism that prevents dust from staying on the filter silencer 502, the service life of the filter silencer 502 is significantly extended, and the maintenance requirements of manual cleaning or replacement of the filter silencer 502 are reduced, so that the air compressor can achieve a maintenance-free or low-maintenance operating state.

[0040] Example 2: According to Figures 8 to 10As shown, different from Example 1, the filter silencer 5 is better maintained by another method, and the filter silencer 5 is reversely blown using the recovered high-pressure gas, wherein the filter silencer 5 includes a shell 501, an air intake hole 5011 and a reverse blowing hole 5012 are formed on the shell 501, a filter silencer 502 is arranged in the shell 501, the outer end of the shell 501 is fixedly connected to the filter cover 503, the air intake hole 5011 is fixedly connected to the air inlet 3021, the reverse blowing hole 5012 is located between the air intake hole 5011 and the filter silencer 502, and the reverse blowing hole 5012 and the air outlet 3022 are connected through the solenoid valve 12. The reverse blow hole 5012 directs the high-pressure gas from the outlet hole 3022 and the cylinder 301 back to the filter-muffler 5, blowing air in the opposite direction against dust and other particles accumulated on the filter-muffler 502 within the filter-muffler 5. This high-pressure reverse airflow effectively strips away and removes dust and contaminants accumulated on the outer surface of the filter housing 503, preventing them from clogging the filter-muffler 502 and causing air intake obstruction, reduced efficiency, or equipment failure. This increases the service life of the filter-muffler 502 by three to four times. This automatic cleaning mechanism reduces the need for manual cleaning or replacement of the filter-muffler 502, enabling the air compressor to operate in a maintenance-free or low-maintenance state.

[0041] A blow-assisting member 504 is fixedly connected between the filter and silencer 502 and the air intake port 5011. The reverse air intake port 5012 is positioned opposite the blow-assisting member 504 and includes blow-assisting holes 505 therein, communicating with the reverse air intake port 5012 and the blow-assisting holes 505. The blow-assisting member 504 facilitates reverse airflow. The inner wall of the housing 501 is angled, securing the filter and silencer 502 in place. The blow-assisting member 504 effectively removes and blows away dust and contaminants accumulated on the outer surface of the filter housing 503, preventing them from clogging the filter and silencer 502 and causing poor air intake, reduced efficiency, or equipment failure. The blow-assisting member 504 has an inwardly recessed annular hole 506, with the openings of the reverse air intake port 5012 located within the annular hole 506. One to three blow-assisting holes 505 are evenly distributed circumferentially on the sidewall of the blow-assisting member 504, communicating with the annular hole 506. Air entering the reverse blow hole 5012 directly enters the annular hole 506, where it is distributed to each of the auxiliary blow holes 505. The dispersed auxiliary blow holes 505 more effectively reverse blow at every angle of the filter silencer 502, effectively stripping and blowing away dust and contaminants accumulated on the outer surface of the filter cover 503. The auxiliary blow holes 505 include a first circle of holes 5051 and a second circle of holes 5052. The first circle of holes 5051 and the second circle of holes 5052 are arranged in a staggered manner, with the axis of the first circle of holes 5051 and the axis of the second circle of holes 5052 being arranged at an angle. The axis of the first circle of holes 5051 and the axis of the second circle of holes 5052 are arranged at an angle to cover the air inlet surface of the filter and silencer 502. The airflows at different angles overlap and interweave with each other, forming a more uniform and three-dimensional high-pressure airflow coverage network for the filter and silencer 502, significantly increasing the effective blowing area. The angled airflow acts on different positions and directions of the filter and silencer 502, generating more complex turbulence and shear force, thereby more effectively stripping off and forcefully blowing away dust and pollutants accumulated on various outer surfaces of the filter and silencer 502, thereby greatly improving the cleaning efficiency.

[0042] The above embodiments are only preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection defined by the claims of the present invention.

Claims

1. A maintenance-free air compressor, comprising an air storage tank (1), the air storage tank (1) having an air filling seat (101) and an air outlet seat (102), the air storage tank (1) being fixedly connected to a motor (2) and a machine head (3), the motor (2) comprising a rotating shaft (201), the machine head (3) being provided with a cylinder (301), a cylinder head (302), a crankshaft (303) and a piston (304), the rotating shaft (201) being fixedly connected to the crankshaft (303) The crankshaft (303) drives the piston (304) to move up and down in the cylinder (301). A valve plate (305) is fixedly connected between the cylinder cover (302) and the cylinder (301). The cylinder cover (302) is provided with an air inlet (3021) and an air outlet (3022). The air outlet (3022) is connected to the inflation seat (101) and inflates the air tank (1). The air inlet (3021) is fixedly connected to a filter muffler (5). The invention is characterized in that: The top of the gas storage tank (1) is provided with a connecting hole (103), a sealing plug (6) is fixedly connected in the connecting hole (103), one end of the sealing plug (6) is fixedly connected to a water pipe (7), the other end of the water pipe (7) extends into the bottom of the gas storage tank (1), the other end of the sealing plug (6) is connected to a drainer (9) through a water pipe (8), one end of the drainer (9) is connected to an evaporation basin (11) through a water pipe (10), and the evaporation basin (11) is fixed close to one side of the motor (2).

2. A maintenance-free air compressor according to claim 1, characterized in that: The upper end of the drainer (9) is provided with a water inlet (901), the water pipe 2 (8) is fixedly connected to the water inlet (901), the bottom end of the drainer (9) is provided with a water outlet (902), the water outlet (902) is fixedly connected to the water pipe 3 (10), and a float valve (903) is provided in the drainer (9), and the float valve (903) controls the opening and closing of the water outlet (902).

3. A maintenance-free air compressor according to claim 2, characterized in that: The drainer (9) has an accommodating chamber (904), a baffle (905) is fixedly connected to the accommodating chamber (904), the baffle (905) is arranged opposite to the water inlet (901) and is located below the water inlet (901), an isolation plate (906) is further provided on the inner wall of the drainer (9), a water hole (907) is provided in the middle of the isolation plate (906), the isolation plate (906) is located between the baffle (905) and the water outlet (902), and the float valve (903) is in contact with or away from the water hole (907).

4. A maintenance-free air compressor according to any one of claims 1 to 3, characterized in that: The filter silencer (5) comprises a shell (501), an air intake hole (5011) and a reverse blowing hole (5012) are formed on the shell (501), a filter silencer (502) is arranged in the shell (501), the outer end of the shell (501) is fixedly connected to the filter cover (503), the air intake hole (5011) is fixedly connected to the air inlet hole (3021), the reverse blowing hole (5012) is located between the air intake hole (5011) and the filter silencer (502), and the reverse blowing hole (5012) and the air outlet hole (3022) are connected via a solenoid valve (12).

5. The maintenance-free air compressor according to claim 4, characterized in that: A blowing assisting member (504) is fixedly connected between the filtering and muffler member (502) and the air intake hole (5011), the reverse blowing hole (5012) is arranged opposite to the blowing assisting member (504), a blowing assisting hole (505) is arranged in the blowing assisting member (504), and the reverse blowing hole (5012) and the blowing assisting hole (505) are communicated.

6. The maintenance-free air compressor according to claim 5, characterized in that: The outer circumference of the blowing-assisting member (504) is recessed with a circle of annular holes (506), the opening of the reverse blowing hole (5012) is located in the annular hole (506), and the side wall of the blowing-assisting member (504) is evenly distributed with one to three circles of blowing-assisting holes (505) in the circumferential direction, and the blowing-assisting holes (505) are connected to the annular hole (506).

7. The maintenance-free air compressor according to claim 6, characterized in that: The blowing holes (505) include a first circle of holes (5051) and a second circle of holes (5052). The first circle of holes (5051) and the second circle of holes (5052) are arranged staggered with each other, and the axis of the first circle of holes (5051) and the axis of the second circle of holes (5052) are arranged at an angle.

8. A maintenance-free air compressor according to any one of claims 1 to 3, characterized in that: The cylinder head (302) is provided with an air inlet cavity (3023) and an air outlet cavity (3024) that are isolated from each other on the side facing the valve plate (305); the air inlet hole (3021) is connected to the air inlet cavity (3023); the air outlet hole (3022) is connected to the air outlet cavity (3024); and the cylinder head (302) is further provided with an air return hole (3025); the air return hole (3025) is connected to the air outlet hole (3022) and the air inlet cavity (3023).

9. The maintenance-free air compressor according to claim 8, characterized in that: The filter silencer (5) comprises a shell (501), a filter silencer (502) is fixedly arranged in the shell (501), an air intake hole (5011) and an air passage hole (507) are formed on the shell (501), and the filter silencer (502) is located between the air intake hole (5011) and the air passage hole (507).

10. The maintenance-free air compressor according to claim 9, characterized in that: The air outlet (3022) is connected to the inflation seat (101) through the air pipe (13), and the air return hole (3025) is connected to the air pipe (14). One end of the air pipe (14) is connected to the electromagnetic valve (12), and one end of the air pipe (13) is connected to the electromagnetic valve (12).

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