A maintenance-free air compressor

Abstract

The application provides a kind of maintenance-free air compressor, belongs to air compressor technical field.It solves the technical problems such as manual drainage required by existing air compressor.The maintenance-free air compressor includes air tank, motor and machine head, the motor includes rotating shaft, the machine head is provided with cylinder, cylinder cover, crankshaft and piston, the rotating shaft is fixedly connected with the crankshaft, the crankshaft drives the piston to move up and down in the cylinder, the cylinder cover has air inlet hole and air outlet hole, the air outlet hole is communicated with the air charging seat and charges the air tank, the air inlet hole is fixedly connected with filter silencer, the top of the air tank is provided with connecting hole, the connecting hole is fixedly connected with sealing plug, one end of the sealing plug is fixedly connected with water pipe one, the water pipe one extends until close to the bottom of the air tank, the other end of the sealing plug is connected with the water drain device through water pipe two, one end of the water drain device is connected with the evaporation basin through water pipe three, the evaporation basin is fixed close to one side of the motor.The application does not need user intervention, and the filter system is self-cleaning, which constitutes a complete maintenance-free scheme.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of air compressors, in particular to a maintenance-free air compressor. BACKGROUND

[0002] In the field of medical air compressors, the cleanliness of compressed gas, the long-term reliability and stable operation of the equipment have extremely strict requirements. Medical gas directly or indirectly acts on patients, and oil pollution must be eliminated, and the equipment needs to be continuously, quietly and stably operated in a medical environment.

[0003] In the prior art, a medical oil-free scroll variable frequency air compressor is disclosed in Chinese Patent No. 2018110890402, and the core advantage lies in that an oil-free scroll compression host and a permanent magnet synchronous motor are adopted in combination with variable frequency control technology. The oil-free scroll compression host, the permanent magnet synchronous motor and the air tank are integrated on the mounting frame, an air filter and a check valve are arranged at the air inlet end, a pressure gauge, an electronic drain valve and an exhaust ball valve are arranged on the air tank, and the pressure sensor built in the air tank is connected to the variable frequency controller, so that the motor is automatically started and stopped according to the set pressure threshold to maintain constant pressure output. This design effectively guarantees the cleanliness of the gas, realizes terminal constant pressure and constant flow output through variable frequency control, and has the characteristics of low noise and low vibration, so that it basically meets the needs of the medical environment.

[0004] However, the air filter, as the first line of defense to guarantee the cleanliness of the gas, is exposed to the environment for a long time. After about 500 hours of cumulative use, the filter element must be replaced due to the accumulation of adsorbed pollutants, which increases the air inlet resistance and reduces the compression efficiency. The existing technology completely relies on manual regular inspection, disassembly, cleaning or replacement of the filter element. This not only increases the workload and downtime of the maintenance personnel, but also has the risk of reduced filtering effect, entry of pollutants into the system and even influence on the performance of the equipment due to untimely maintenance, thereby reducing the overall work efficiency and equipment reliability. Moreover, after the compressed air is cooled in the air tank, a large amount of condensed water is inevitably produced and deposited at the bottom of the tank. The existing technology usually requires the operator to manually open the electronic drain valve or the ball valve at least once a day to drain the water. If the water is not cleaned in time, the water in the tank not only occupies the effective air storage volume, reduces the efficiency of the equipment, but more importantly, significantly increases the humidity of the compressed air in the air tank. High-humidity compressed air may cause instrument failure, affect treatment effect or breed microorganisms in medical scenarios, thereby bringing potential risks. This daily manual drainage operation also increases the maintenance cost and the possibility of human error. SUMMARY

[0005] In view of the deficiencies of the prior art, the present application aims to provide a maintenance-free air compressor.

[0006] The present application can be achieved by the following technical scheme: a maintenance-free air compressor, comprising a gas storage tank, the gas storage tank is provided with an air charging seat and an air outlet seat, the gas storage tank is fixedly connected with a motor and a machine head, the motor comprises a rotating shaft, the machine head is provided with a cylinder, a cylinder cover, a crankshaft and a piston, the rotating shaft is fixedly connected with the crankshaft, the crankshaft drives the piston to move up and down in the cylinder, the cylinder cover and the cylinder are fixedly connected with a valve plate, the cylinder cover is provided with an air inlet hole and an air outlet hole, the air outlet hole is communicated with the air charging seat and charges the gas storage tank, the air inlet hole is fixedly connected with a filter silencer, the top of the gas storage tank is provided with a connecting hole, the connecting hole is fixedly connected with a sealing plug, one end of the sealing plug is fixedly connected with a water pipe one, the other end of the water pipe one extends into the gas storage tank and approaches the bottom of the gas storage tank, the other end of the sealing plug is connected with a water drain device through a water pipe two, one end of the water drain device is connected with an evaporation basin through a water pipe three, and the evaporation basin is fixedly arranged on the side close to the motor. The sealing plug is fixedly connected with a water pipe quick connector, the water pipe one and the water pipe two are connected through the water pipe quick connector, and the water pipe one is made of hard material.

[0007] The principle of the present application is that the motor drives the crankshaft to move, and the piston reciprocates in the cylinder. When the piston moves downward, negative pressure is formed in the cylinder, and external air is sequentially sucked into the cylinder through the filter silencer, the air inlet hole of the cylinder cover and the air inlet valve on the valve plate. When the piston moves upward, the air inlet valve is closed, the sucked air is compressed, the pressure is increased, the air outlet valve is opened, and the compressed gas enters the gas storage tank through the air outlet hole of the cylinder cover. When the gas pressure in the gas storage tank reaches a certain amount, a small amount of water at the bottom of the gas storage tank is pressed out through the water pipe one and the water pipe two due to the gas pressure in the gas storage tank. The water in the water drain device is drained to the evaporation basin through the water pipe three. Since the motor generates heat during operation, and the air compressor will vibrate to a certain extent during operation, the vibration and the heat of the motor accelerate the evaporation of the water in the water drain device. The air charging process of the air compressor can always drain water, and when there is no water to be drained, the water drain device will automatically close the valve. The present application automatically drains water when there is water in the gas storage tank, effectively prevents rust in the gas storage tank, prolongs the service life of the gas storage tank, and ensures the dryness of the output compressed air. The whole process of water drainage, water diversion and evaporation is automatically operated without user intervention. Together with the self-cleaning of the filter system, a complete maintenance-free solution is formed.

[0008] In the above maintenance-free air compressor, the upper end of the water drain is provided with a water inlet hole, the water pipe two is fixedly connected with the water inlet hole, the bottom end of the water drain is provided with a water outlet hole, the water outlet hole is fixedly connected with the water pipe three, the water drain is provided with a float ball valve, and the float ball valve controls the opening and closing of the water outlet hole.

[0009] In the above maintenance-free air compressor, the water drain has a containing cavity, the containing cavity is fixedly connected with a flow baffle, the flow baffle is arranged opposite to the water inlet hole and below the water inlet hole, and a partition plate is further arranged on the inner wall of the water drain, the partition plate has a water passing hole in the middle, the partition plate is located between the flow baffle and the water outlet hole, and the float ball valve abuts against or is away from the water passing hole.

[0010] The flow baffle of the scheme can buffer and disperse the water flow flowing at high speed from the water inlet hole, prevent the water flow from directly impacting the float ball or causing the water level to fluctuate sharply, ensure that the float ball can stably and accurately sense the actual water level, and improve the reliability of control. The partition plate divides the containing cavity into a water inlet buffering area and a float ball control water outlet area, and the water passing hole is the only channel connecting the two areas. The flow baffle is arranged to be spirally arranged by two or more spiral blades, the blades are stacked without axial gaps, and there is a spiral gap between the adjacent two blades, which can accelerate gas-liquid separation and better isolate the disturbance of the water inlet, so that the water level in the control area where the float ball is located is more stable and is not affected by the instantaneous impact of the water flow, and the float ball moves more accurately. The direct impact or interference of the water flow on the float ball is reduced. The float ball valve directly acts on the water passing hole, abuts against to close, and is away from to open, which makes the float ball valve more sensitive and accurate.

[0011] In the above maintenance-free air compressor, the filter silencer comprises a shell, the shell is formed with an air suction hole and a reverse air blowing hole, the shell is provided with a filter silencing piece, the shell is fixedly connected with a filter cover at the outer end, the air suction hole is fixedly communicated with the air inlet hole, the reverse air blowing hole is located between the air suction hole and the filter silencing piece, and the reverse air blowing hole and the air outlet hole are communicated through an electromagnetic valve.

[0012] After the air compressor completes the charging of the gas tank, the air outlet hole and the gas tank are disconnected by the electromagnetic valve, but before the next start of the air compressor, the high-pressure air in the internal space between the air outlet hole and the gas tank must be discharged, so when the air outlet hole and the gas tank are closed, the prior art directly discharges air from the air outlet hole.

[0013] The present scheme utilizes the reverse blowing hole to guide the outlet hole and the high-pressure gas in the cylinder back to the filter silencer, and reversely blows the dust on the filter silencer. The high-pressure reverse airflow can effectively strip and blow away the dust and pollutants accumulated on the outer surface of the filter cover, prevent it from blocking the filter silencer, cause poor air intake, efficiency decline or equipment failure, and increase the service life of the filter silencer to 3-4 times of the original. Through this automatic cleaning mechanism, the maintenance needs of manual cleaning or replacing the filter silencer are reduced, so that the air compressor reaches a maintenance-free or low-maintenance operating state.

[0014] In the above maintenance-free air compressor, the filter silencer and the air inlet hole are fixedly connected with a blowing aid, the reverse blowing hole is oppositely arranged with the blowing aid, the blowing aid is provided with a blowing hole, and the reverse blowing hole and the blowing hole are communicated. The blowing aid can better realize reverse blowing. The inner wall of the shell is an inclined wall, and the filter silencer is fixedly clamped by the inclined wall. The blowing aid can effectively strip and blow away the dust and pollutants accumulated on the outer surface of the filter cover, prevent it from blocking the filter silencer, cause poor air intake, efficiency decline or equipment failure.

[0015] In the above maintenance-free air compressor, the blowing aid is inwardly recessed with a ring-shaped hole around the periphery, the orifice of the reverse blowing hole is located in the ring-shaped hole, and the side wall of the blowing aid is uniformly distributed with one to three circles of blowing holes around the periphery. The gas entering the reverse blowing hole directly enters the ring-shaped hole, and is distributed to each blowing hole from the ring-shaped hole. The dispersed blowing holes can more effectively blow against each angle of the filter silencer, and more effectively strip and blow away the dust and pollutants accumulated on the outer surface of the filter cover.

[0016] In the above maintenance-free air compressor, the blowing hole includes a first circle of holes and a second circle of holes, the first circle of holes and the second circle of holes are arranged staggered with each other, and the axis of the first circle of holes and the axis of the second circle of holes are arranged at an angle. The axes of the first circle of holes and the second circle of holes are arranged at an angle, which can cover the air inlet surface of the filter silencer. The airflow at different angles is superimposed and interwoven, can form a more uniform and three-dimensional high-pressure airflow covering network on the filter silencer, significantly increases the effective blowing area, the airflow at different angles acts on different positions and directions of the filter silencer, can produce more complex turbulent flow and shear force, thereby more effectively stripping and strongly blowing away the dust and pollutants accumulated on the outer surface of the filter silencer, and the cleaning efficiency is greatly improved.

[0017] In the above maintenance-free air compressor, the cylinder cover is provided with an air inlet cavity and an air outlet cavity which are isolated from each other on one side of the valve plate, the air inlet hole and the air inlet cavity are communicated, the air outlet hole and the air outlet cavity are communicated, and the cylinder cover is further provided with a return air hole which communicates the air outlet hole and the air inlet cavity.

[0018] The scheme is another way of reverse blowing of the filter silencer, that is, the high-pressure gas of the machine head is introduced back to the air inlet cavity, and the pressure difference is used to flow the high-pressure gas to the filter silencer with low air pressure, to further reverse blow the filter silencer and blow away the dust and pollutants accumulated on the outer surface of the filter cover, and improve the service life of the filter silencer.

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

[0020] In the above-mentioned maintenance-free air compressor, the air outlet hole is communicated with the air charging seat through the air pipe one, the air return hole is connected with the air pipe two, one end of the air pipe two is connected with the electromagnetic valve, and one end of the air pipe one is connected with the electromagnetic valve. The electromagnetic valve is controlled by the system assembly, when the air charging of the gas storage tank is finished, the electromagnetic valve receives the instruction to close the communication between the air pipe one and the gas storage tank, and simultaneously opens the communication between the air pipe two and the air pipe one, the air pipe two introduces the high-pressure gas in the air pipe one and the machine head to the air inlet cavity to realize reverse blowing, through this automatic cleaning mechanism, the service life of the filter silencer is significantly prolonged, the maintenance demand of manual cleaning or replacement of the filter silencer is reduced, so that the air compressor reaches the operation state of maintenance-free or low maintenance.

[0021] Compared with the prior art, the technical effects of the present application are: (1) the bottom condensate in the gas storage tank is pressed into the drain through the water pipe one and the water pipe two by the gas pressure in the gas storage tank, the float valve opens the water passage hole when the water level reaches, the water flows into the evaporation basin through the water pipe three, the motor waste heat and the whole machine vibration promote the rapid evaporation of the accumulated water in the evaporation basin, the whole process does not need manual intervention, and is automatically and continuously carried out, which effectively prevents the tank body from rusting and ensures the gas dryness. (2) when the machine head high pressure needs to be released after the air charging of the gas storage tank is finished, the high-pressure gas is recycled, the high-pressure gas enters the annular hole of the blowing aid through the reverse blowing hole by the electromagnetic valve conduction, and is sprayed out at high speed through the angular staggered blowing holes, the strong, uniform and multi-angle reverse airflow penetrates the filter silencer, strongly peels and blows away the dust and pollutants accumulated on the external filter cover, significantly prolongs the service life of the filter silencer by 3 to 4 times, and realizes self-cleaning. (3) after the electromagnetic valve is switched, the high-pressure gas in the machine head and the air pipe one is no longer charged into the gas storage tank, but is introduced back to the air inlet cavity of the cylinder cover through the air pipe two and the air return hole. The air inlet cavity is communicated with the inside of the filter silencer through the air inlet hole, and a pressure difference is formed. The high-pressure gas naturally flows to the low-pressure area, that is, reversely flows out from the air inlet cavity through the air inlet hole, the inside of the filter silencer, and the filter cover is also cleaned by reverse blowing. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 is a perspective view of embodiment one of the present application Figure One .

[0023] Figure 2 is a perspective view of the embodiment one of the present application Figure Two .

[0024] Figure 3 is a sectional view of the embodiment one of the present application

[0025] Figure 4 is a sectional view of the drain of the embodiment one of the present application

[0026] Figure 5 is an axial view of the damper of the embodiment one of the present application

[0027] Figure 6 is a partial sectional view of the embodiment one of the present application

[0028] Figure 7 is a perspective view of the cylinder head of the embodiment one of the present application

[0029] Figure 8 is a perspective view of the embodiment two of the present application

[0030] Figure 9 is a sectional view of the filter muffler of the embodiment two of the present application

[0031] Figure 10 is a perspective view of the air blowing aid of the embodiment two of the present application

[0032] Figure No. Mark: 1, gas storage tank; 101, gas charging seat; 102, gas outlet seat; 103, connecting hole; 2, motor; 201, rotating shaft; 3, machine head; 301, cylinder; 302, cylinder head; 3021, air inlet hole; 3022, air outlet hole; 3023, air inlet cavity; 3024, air outlet cavity; 3025, air return hole; 303, crankshaft; 304, piston; 305, valve plate; 4, support; 5, filter muffler; 501, shell; 5011, air inlet hole; 5012, reverse air blowing hole; 502, filter muffling piece; 503, filter cover; 504, air blowing aid; 505, air blowing hole; 5051, first circle hole; 5052, second circle hole; 506, annular hole; 507, air passing hole; 6, sealing plug; 7, water pipe one; 8, water pipe two; 9, drain; 901, water inlet hole; 902, water outlet hole; 903, floating ball valve; 904, containing cavity; 905, damper; 906, isolation plate; 907, water passing hole; 10, water pipe three; 11, evaporation basin; 12, electromagnetic valve; 13, air pipe one; 14, air pipe two; 15, water pipe quick connector. DETAILED DESCRIPTION

[0033] The following is a specific embodiment of the present application and further describes the technical solutions of the present application in conjunction with the drawings, but the present application is not limited to these embodiments.

[0034] It should be noted that the present application is described in terms of "upper", "lower", "left", "right", "top", "bottom" and the like, which are defined based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device must be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0035] Embodiment one: according to Figures 1 to 7 As shown in the figure, a kind of maintenance-free air compressor, including air tank 1, air tank 1 with air seat 101 and air outlet seat 102, air seat 101 and air outlet seat 102 and air tank 1 communication. Air outlet seat 102 is used to connect the component of external use high pressure gas. Air tank 1 is fixedly connected with a bracket 4 by welding, motor 2 and head 3 are fixed on the bracket 4, motor 2 includes rotating shaft 201, head 3 is provided with cylinder 301, cylinder cover 302, crankshaft 303 and piston 304, rotating shaft 201 is fixedly connected with crankshaft 303, crankshaft 303 drives piston 304 to move up and down in cylinder 301, valve plate 305 is fixedly connected between cylinder cover 302 and cylinder 301, cylinder cover 302 has air inlet hole 3021 and air outlet hole 3022, air outlet hole 3022 is communicated with air seat 101 and fills air tank 1, air inlet hole 3021 is fixedly connected with filter silencer 5, the top of air tank 1 is provided with connecting hole 103, connecting hole 103 is fixedly connected with sealing plug 6, one end of sealing plug 6 is fixedly connected with water pipe one 7, the other end of water pipe one 7 extends until close to the bottom of air tank 1, the other end of sealing plug 6 is connected with water drainer 9 through water pipe two 8, one end of water drainer 9 is connected with evaporation basin 11 through water pipe three 10, evaporation basin 11 is fixed close to the side of motor 2. Sealing plug 6 is fixedly connected with water pipe quick connector 15, water pipe one 7 and water pipe two 8 are connected through water pipe quick connector 15, water pipe one 7 adopts the water pipe of hard material. Evaporation basin 11 is fixed on bracket 4 by setting magnetic attraction piece.

[0036] The working principle is that the motor 2 drives the crankshaft 303 to move, and the piston 304 reciprocates in the cylinder 301. When the piston 304 goes down, a negative pressure is formed in the cylinder 301, and external air is sequentially sucked into the cylinder 301 through the filter silencer 5, the air inlet hole 3021 of the cylinder cover 302, and the air inlet valve on the valve plate 305. When the piston 304 goes up, the air inlet valve is closed, the sucked air is compressed, the pressure rises, the air outlet valve is opened, and the compressed gas enters the air tank 1 through the air outlet hole 3022 of the cylinder cover 302. After the air pressure in the air tank 1 is stored to a certain amount, a small amount of accumulated water at the bottom of the air tank 1 is pressed to the drain 9 through the water pipe 1 and the water pipe 2 8, and the accumulated water in the drain 9 is drained to the evaporation basin 11 through the water pipe 3 10. Since the motor 2 generates heat during operation, and the air compressor has a certain small range of vibration during operation, the vibration and the heat of the motor 2 promote the evaporation of the accumulated water in the drain 9, and the process of air charging can always drain water, and when there is no accumulated water to drain, the drain 9 will automatically close the valve. The scheme is that when there is accumulated water in the air tank 1, it will be automatically drained, effectively preventing the inside of the air tank 1 from rusting, prolonging the service life of the air tank 1, and ensuring the dryness of the output compressed air. The whole process of draining, guiding and evaporating is automatically operated without user intervention, and together with the self-cleaning of the filtering system, it constitutes a complete maintenance-free scheme.

[0037] The water inlet hole 901 is arranged at the upper end of the drain 9, and the water pipe 2 8 is fixedly connected with the water inlet hole 901. The water outlet hole 902 is arranged at the bottom end of the drain 9, and the water outlet hole 902 is fixedly connected with the water pipe 3 10. The drain 9 is provided with a float ball valve 903, which controls the opening and closing of the water outlet hole 902. When the accumulated water in the drain 9 reaches a certain height, the float ball rises with the water level, opens the water outlet hole 902 and drains water; when the water level drops, the float ball falls and closes the drain. This realizes the functions of automatically closing without water to prevent gas leakage and automatically opening the drain when there is water, completely without manual intervention.

[0038] The drain device 9 has a containing cavity 904 therein, the containing cavity 904 is fixedly connected with a flow baffle 905, the flow baffle 905 is oppositely arranged with the water inlet hole 901 and is located below the water inlet hole 901, a partition plate 906 is further arranged on the inner wall of the drain device 9, the partition plate 906 has a water passing hole 907 in the middle, the partition plate 906 is located between the flow baffle 905 and the water outlet hole 902, and the float ball valve 903 abuts against or is away from the water passing hole 907. The flow baffle 905 includes at least two spiral blades, the blades are stacked without axial gaps, and spiral gaps are formed between adjacent two blades. The flow baffle 905 can buffer and disperse the water flow flowing into at high speed from the water inlet hole 901, prevent the water flow from directly impacting the float ball or causing the water level to fluctuate sharply, ensure that the float ball can stably and accurately sense the actual water level, and improve the reliability of control. The partition plate 906 divides the containing cavity 904 into a water inlet buffer area and a float ball control water outlet area, and the water passing hole 907 is the only channel connecting the two areas. The flow baffle 905 is arranged in a spiral manner by more than two spiral blades, the blades are stacked without axial gaps, and spiral gaps are formed between adjacent two blades, which can accelerate gas-liquid separation, better isolate the disturbance of the water inlet, make the water level in the control area where the float ball is located more stable and not affected by the instantaneous impact of the water inlet flow, and make the float ball action more accurate. The direct impact or interference of the water inlet flow on the float ball is reduced. The float ball valve 903 directly acts on the water passing hole 907, abuts against to close and is away from to open, which makes the float ball valve 903 more sensitive and accurate.

[0039] After the air compressor finishes filling the air tank 1, the 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 inside the compressor head 3 and the air tank 1 must be vented. Therefore, in the prior art, when the outlet 3022 and the air tank 1 are closed, the air is directly discharged through the outlet 3022. This high-pressure air can be recycled to better maintain the filter muffler 5. An intake chamber 3023 and an outlet chamber 3024, which are isolated from each other, are provided on the side of the cylinder head 302 facing the valve plate 305. The intake port 3021 is connected to the intake chamber 3023, and the outlet port 3022 is connected to the outlet chamber 3024. A return port 3025 is also provided on the cylinder head 302, which connects the outlet port 3022 and the intake chamber 3023. The high-pressure gas from the head unit 3 is diverted back to the intake chamber 3023. Utilizing the pressure difference, the high-pressure gas flows towards the low-pressure filter silencer 502, further reversing the airflow to peel away dust and contaminants accumulated on the outer surface of the filter cover 503, thus improving the service life of the filter silencer 502. The filter silencer 5 includes a housing 501, within which the filter silencer 502 is fixedly installed. The housing 501 has an intake hole 5011 and an exhaust hole 507 formed thereon. The filter silencer 502 is located between the intake hole 5011 and the exhaust hole 507. The exhaust hole 507 draws air in from the outside and discharges high-pressure gas. The exhaust hole 3022 is connected to the inflation seat 101 via an air pipe 13. The return air hole 3025 is connected to an air pipe 14, one end of which is connected to a solenoid valve 12. One end of the air pipe 13 is connected to the solenoid valve 12. Solenoid valve 12 is controlled by the system assembly. After the high-pressure filling of air tank 1 is completed, solenoid valve 12 receives the instruction to close the connection between air pipe 13 and air tank 1, and at the same time open the connection between air pipe 2 14 and air pipe 13. Air pipe 2 14 guides the high-pressure gas in air pipe 13 and the compressor head 3 to the air inlet chamber 3023 to achieve 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 needs of manually cleaning or replacing 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 one, the filter silencer 5 is better maintained by another way, and the filter silencer 5 is back blown by the recycled high-pressure gas, wherein the filter silencer 5 comprises a shell 501, the shell 501 is formed with an air suction hole 5011 and a back blowing hole 5012, the shell 501 is provided with a filter silencing piece 502, the shell 501 is fixedly connected with a filter cover 503 at the outer end, the air suction hole 5011 is fixedly communicated with the air inlet hole 3021, the back blowing hole 5012 is located between the air suction hole 5011 and the filter silencing piece 502, and the back blowing hole 5012 and the air outlet hole 3022 are communicated through the electromagnetic valve 12. The high-pressure gas in the air outlet hole 3022 and the cylinder 301 is drained back to the filter silencer 5 through the back blowing hole 5012 to back blow the dust on the filter silencing piece 502 in the filter silencer 5, the high-pressure back flow can effectively strip and blow away the dust and pollutants accumulated on the outer surface of the filter cover 503, prevent the filter silencing piece 502 from being blocked to cause poor air intake, efficiency reduction or equipment failure, and the service life of the filter silencing piece 502 is increased to 3-4 times of the original. Through the automatic cleaning mechanism, the maintenance requirement of manual cleaning or replacing the filter silencing piece 502 is reduced, so that the air compressor reaches a maintenance-free or low-maintenance operating state.

[0041] The filter silencer 502 is fixedly connected with the blowing aid 504 between the air inlet hole 5011 and the reverse blowing hole 5012, the blowing aid 504 is oppositely arranged with the reverse blowing hole 5012, the blowing aid 504 is provided with the blowing hole 505, and the reverse blowing hole 5012 and the blowing hole 505 are communicated. The reverse blowing can be better realized through the blowing aid 504. The inner wall of the shell 501 is an inclined wall, and the filter silencer 502 is fixedly clamped through the inclined wall. The dust and pollutants accumulated on the outer surface of the filter cover 503 can be effectively stripped and blown away through the blowing aid 504, so that the filter silencer 502 is prevented from being blocked by the dust and pollutants, and the air inlet is not smooth, the efficiency is reduced, or the equipment is malfunctioned. The blowing aid 504 is inwardly recessed with a ring-shaped hole 506 around the outer periphery, the orifice of the reverse blowing hole 5012 is located in the ring-shaped hole 506, and the side wall of the blowing aid 504 is uniformly distributed with one to three circles of the blowing hole 505 around the outer periphery, and the blowing hole 505 is communicated with the ring-shaped hole 506. The gas entering the reverse blowing hole 5012 directly enters the ring-shaped hole 506, and is distributed to each blowing hole 505 through the ring-shaped hole 506. The dispersed blowing holes 505 can more effectively blow against each angle of the filter silencer 502, and more effectively strip and blow away the dust and pollutants accumulated on the outer surface of the filter cover 503. The blowing hole 505 includes 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. The axes of the first circle of holes 5051 and the second circle of holes 5052 are arranged at an angle, which can cover the air inlet surface of the filter silencer 502, the airflow at different angles is superimposed and interwoven with each other, can form a more uniform and three-dimensional high-pressure airflow covering network on the filter silencer 502, significantly increases the effective blowing area, the airflow at an angle acts on different positions and directions of the filter silencer 502, can produce more complex turbulent flow and shear force, thereby more effectively stripping and strongly blowing away the dust and pollutants accumulated on the outer surface of the filter silencer 502, and the cleaning efficiency is greatly improved.

[0042] The above embodiments are only preferred embodiments of the present application, and do not limit the protection scope of the present application, so that: any equivalent changes made according to the structure, shape, principle of the present application should be covered in the protection scope defined by the claims of the present application.

Claims

1. A maintenance-free air compressor, comprising an air tank (1), wherein the air tank (1) has an air filling seat (101) and an air outlet seat (102), wherein a motor (2) and a compressor head (3) are fixedly connected to the air tank (1), wherein the motor (2) includes a rotating shaft (201), wherein the compressor head (3) is provided with a cylinder (301), a cylinder head (302), a crankshaft (303) and a piston (304), wherein the rotating shaft (201) is fixedly connected to the crankshaft (303). The crankshaft (303) drives the piston (304) to move up and down inside the cylinder (301). A valve plate (305) is fixedly connected between the cylinder head (302) and the cylinder (301). The cylinder head (302) has an air inlet (3021) and an air outlet (3022). The air outlet (3022) is connected to the air filling seat (101) and fills the air tank (1). A filter muffler (5) is fixedly connected to the air inlet (3021). The characteristic of this system is that: The gas storage tank (1) has a connection hole (103) at the top. A sealing plug (6) is fixedly connected in the connection 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 gas storage tank (1) until it is close to the bottom. 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 evaporator (11) through a water pipe (3) (10). The evaporator (11) is fixed to the side close to the motor (2). The drainer (9) has a receiving cavity (904). A baffle plate (905) is fixedly connected in the receiving cavity (904). The baffle plate (905) is arranged opposite to the inlet hole (901) and located below the inlet hole (901). The inner wall of the drainer (9) is also provided with a baffle plate (906). The baffle plate (906) has a water passage hole (907) in the middle. The baffle plate (906) is located between the baffle plate (905) and the outlet hole (902). The drainer (9) is provided with a float valve (903). The float valve (903) is abutted against or away from the water passage hole (907). The float valve (903) controls the opening and closing of the outlet hole (902). The baffle plate includes at least two spirally arranged blades. After the blades are stacked, there is no axial gap. There is a spiral gap between two adjacent blades.

2. The maintenance-free air compressor according to claim 1, characterized in that: The drainer (9) is provided with an inlet hole (901) at the upper end, and the second water pipe (8) is fixedly connected to the inlet hole (901). The drainer (9) is provided with an outlet hole (902) at the bottom end, and the outlet hole (902) is fixedly connected to the third water pipe (10).

3. A maintenance-free air compressor according to claim 1 or 2, characterized in that: The filter silencer (5) includes a housing (501), on which an air intake hole (5011) and a reverse air blowing hole (5012) are formed. A filter silencer (502) is provided inside the housing (501). A filter cover (503) is fixedly connected to the outer end of the housing (501). The air intake hole (5011) is fixedly connected to the air inlet (3021). The reverse air blowing hole (5012) is located between the air intake hole (5011) and the filter silencer (502). The reverse air blowing hole (5012) and the air outlet (3022) are connected through a solenoid valve (12).

4. A maintenance-free air compressor according to claim 3, characterized in that: A blowing aid (504) is fixedly connected between the filter silencer (502) and the air intake (5011). The reverse blowing hole (5012) is arranged opposite to the blowing aid (504). The blowing aid (504) is provided with a blowing hole (505). The reverse blowing hole (5012) and the blowing hole (505) are connected.

5. A maintenance-free air compressor according to claim 4, characterized in that: The blowing aid (504) has an annular hole (506) recessed inward on its outer periphery. The opening of the reverse blowing hole (5012) is located in the annular hole (506). The side wall of the blowing aid (504) has one to three rings of blowing holes (505) evenly distributed in the circumferential direction. The blowing holes (505) are connected to the annular hole (506).

6. A maintenance-free air compressor according to claim 5, characterized in that: The blowing hole (505) includes a first ring hole (5051) and a second ring hole (5052). The first ring hole (5051) and the second ring hole (5052) are staggered and arranged in a staggered manner. The axis of the first ring hole (5051) is set at an angle to the axis of the second ring hole (5052).

7. A maintenance-free air compressor according to claim 1 or 2, characterized in that: The cylinder head (302) is provided with an intake chamber (3023) and an exhaust chamber (3024) that are isolated from each other on the side facing the valve plate (305). The intake port (3021) is connected to the intake chamber (3023), and the exhaust port (3022) is connected to the exhaust chamber (3024). The cylinder head (302) is also provided with a return port (3025), which is connected to the exhaust port (3022) and the intake chamber (3023).

8. A maintenance-free air compressor according to claim 7, characterized in that: The filter silencer (5) includes a housing (501), and a filter silencer (502) is fixedly disposed inside the housing (501). An air intake hole (5011) and an air passage hole (507) are formed on the housing (501), and the filter silencer (502) is located between the air intake hole (5011) and the air passage hole (507).

9. A maintenance-free air compressor according to claim 8, characterized in that: The air outlet (3022) is connected to the air inflator (101) through the first air pipe (13), the air return hole (3025) is connected to the second air pipe (14), one end of the second air pipe (14) is connected to the solenoid valve (12), and one end of the first air pipe (13) is connected to the solenoid valve (12).

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