Air compressor

Abstract

The utility model discloses an air compressor, which relates to the technical field of air compressors, and comprises an air cylinder, an air cylinder cover arranged at the top of the air cylinder, a large piston positioned in the air cylinder, and a small piston inserted in the large piston and fixed on the inner wall of the air cylinder, the large piston divides the air cylinder into an air inlet cavity used for air buffering and a compression cavity used for air compression, the compression cavity comprises a first-stage compression cavity and a second-stage compression cavity, an air inlet communicated with the air inlet cavity is formed in the air cylinder, an air outlet communicated with the second-stage compression cavity is further formed in the air cylinder, and the air outlet is connected with an air storage tank. The large piston is adopted to achieve first-stage compression, the large piston is matched with the small piston to achieve second-stage compression in the first-stage compression process, and therefore the compression structure is simple, the size is small, and the compression efficiency is high.

Description

Technical Field

[0001] The utility model relates to the technical field of air compressors, in particular to an air compressor used for an automobile air suspension system. Background Art

[0002] The air suspension system is an advanced automobile suspension technology. Its working principle is to send compressed air to the air chamber of the spring and shock absorber through an air compressor to change the height of the vehicle. There are level height sensors near the front and rear wheels. According to the output signal of the sensor, the air suspension control unit will judge the change of the vehicle height, and then control the compressor and exhaust valve to compress or extend the spring, so as to achieve the effect of shock absorption. Compared with the traditional spring suspension, the air suspension system has higher adjustability and better adaptability. It can automatically adjust the suspension height of the vehicle according to different road conditions and driving conditions, providing a better driving experience.

[0003] In the air suspension system, the compressor plays a vital role. It is responsible for generating compressed air and providing the necessary air source for the system. Traditional air compressors have many problems such as low gas compression efficiency, weight, and high noise. They are not suitable for use in cars with high requirements for reliability and comfort. In view of these problems, the utility model provides an air compressor with simple structure, easy manufacturing, high gas compression efficiency, stability and reliability. Utility Model Content

[0004] The utility model aims to provide an air compressor with small volume, simple structure, high compression efficiency, stability and reliability. Compared with traditional air compressors under the same working conditions, the air compressor can not only greatly improve the air compression efficiency, but also improve the rated pressure of the air compressor, thereby achieving the purpose of reducing energy consumption.

[0005] In order to achieve the above purpose, the technical solution adopted by the utility model is as follows:

[0006] An air compressor comprises a cylinder, a cylinder cover installed on the top of the cylinder, a large piston located in the cylinder, and a small piston inserted in the large piston and fixed to the inner wall of the cylinder. The large piston is connected to a driving assembly that drives the large piston to reciprocate in the cylinder. The large piston divides the cylinder into an intake chamber for air buffering and a compression chamber for air compression. The compression chamber comprises a primary compression chamber and a secondary compression chamber. An air inlet connected to the intake chamber is provided on the cylinder. An exhaust port connected to the secondary compression chamber is also provided on the cylinder. The exhaust port is connected to an air storage tank.

[0007] Furthermore, an air leakage channel is provided on the small piston, the air leakage channel is connected to an exhaust pipe, and the exhaust pipe is sealably inserted in the exhaust port.

[0008] Furthermore, a sealing plate is fixed on the top of the air leakage channel, a air leakage hole connected to the secondary compression chamber is opened on the sealing plate, and a spring member for connecting / closing the air leakage hole and the air leakage channel is arranged in the air leakage channel.

[0009] Furthermore, the spring component includes a spring and a one-way sealing valve, both ends of the spring are respectively fixed in the air release channel and on the one-way sealing valve, and the one-way sealing valve is sealed and fitted with the sealing component pressure plate under the action of the spring elastic force.

[0010] Furthermore, the outer wall of the sealing plate is sleeved with a small cylinder sealing member which is in sealing contact with the small piston.

[0011] Furthermore, the large piston is provided with an assembly hole adapted to the small piston, the small piston is inserted into the assembly hole and fixed to the inner wall of the cylinder, the inner wall of the assembly hole is sleeved with a small cylinder sleeve, and the inner wall of the small cylinder sleeve is in sealing contact with the outer wall of the small cylinder seal.

[0012] Furthermore, the large piston is provided with an intake passage connected to the intake chamber, and the top of the large piston is provided with an intake and exhaust component connected to the intake passage for introducing the air in the intake chamber into the first compression chamber, and introducing the first compressed air in the first compression chamber into the second compression chamber.

[0013] Furthermore, the air intake and exhaust components include an intake valve sheet, a valve plate and an exhaust valve sheet overlapping from top to bottom; a groove is provided on the valve plate, an intake hole connected to the intake channel is provided in the groove, and a convex piece is provided on the intake valve sheet that matches the groove and protrudes toward the valve plate, and the convex piece is sealed and fitted with the groove; a first exhaust hole and a second exhaust hole are respectively provided on the valve plate and the intake valve sheet, the first exhaust hole is connected to the second exhaust hole, and the exhaust valve sheet is sealed and fitted with the second exhaust hole.

[0014] Furthermore, a large cylinder liner is sleeved on the inner wall of the cylinder, and the intake and exhaust components further include a large cylinder seal sleeved outside the valve plate and in sealing contact with the inner wall of the large cylinder liner.

[0015] Furthermore, a bearing is connected to the bottom of the large piston, and the driving assembly includes a driving motor and a crankshaft connected to the driving shaft of the driving motor, and the crankshaft is connected to the bearing.

[0016] Compared with the prior art, the utility model has the following beneficial effects:

[0017] The utility model adopts a large piston to realize the first-stage compression, and cooperates with a small piston to realize the second-stage compression during the first-stage compression process of the large piston, so that the compression structure is simple, the volume is small, and the compression efficiency is high. The utility model utilizes the pressure change before and after the gas is compressed to smoothly realize the conversion between the first-stage compression and the second-stage compression, and realizes the two-stage compression only through the movement consumption of the large piston, which greatly reduces the energy consumption and improves the compression efficiency. In addition, the seal of the second-stage compression is smaller, which effectively reduces the workload of the drive component and prolongs the service life of the compressor. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural cross-sectional view of the utility model.

[0019] Figure 2 This is a structural diagram of a small piston of the utility model.

[0020] Figure 3 It is a cross-sectional view of the small piston of the utility model.

[0021] Figure 4 This is the structural diagram of the large piston of the utility model.

[0022] Figure 5 This is a cross-sectional view of the large piston of the utility model.

[0023] Figure 6 This is an exploded view of the intake and exhaust components of the utility model.

[0024] Figure 7 This is a connection diagram of the large piston, small piston and drive assembly of the utility model.

[0025] The names corresponding to the reference numerals are:

[0026] 1-cylinder, 2-cylinder head, 3-large piston, 4-small piston, 5-drive assembly, 6-intake chamber, 7-first compression chamber, 8-second compression chamber, 9-air storage tank, 11-intake port, 12-exhaust port, 13-large cylinder liner, 31-assembly hole, 32-small cylinder liner, 33-intake channel, 34-valve plate, 35-intake valve plate, 36-exhaust valve plate, 37-large cylinder seal, 38-bearing, 341-groove, 342-intake hole, 343-first exhaust hole, 351-convex piece, 352-second exhaust hole, 41-exhaust channel, 42-exhaust pipe, 43-seal pressure plate, 44-exhaust through hole, 45-spring, 46-one-way sealing valve, 47-small cylinder seal, 51-drive motor, 52-crankshaft. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the utility model more clear, the utility model is further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

[0028] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore they cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0029] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; of course, it can also be a mechanical connection or an electrical connection; in addition, it can also be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0030] like Figure 1-7 As shown, the utility model provides an air compressor, comprising a cylinder 1, a cylinder cover 2 installed on the top of the cylinder 1, a large piston 3 located in the cylinder 1, and a small piston 4 inserted in the large piston 3 and fixed to the inner wall of the cylinder 1, the large piston 3 is connected to a driving assembly 5 for driving the large piston 3 to reciprocate in the cylinder 1, the large piston 3 divides the cylinder 1 into an air intake chamber 6 for air caching and a compression chamber for air compression, the compression chamber comprises a primary compression chamber 7 and a secondary compression chamber 8, an air inlet 11 connected to the air intake chamber 6 is provided on the cylinder 1, an exhaust port 12 connected to the secondary compression chamber 8 is also provided on the cylinder 1, and the exhaust port 12 is connected to an air storage tank 9. The air enters the air inlet chamber 6 through the air inlet 11 and then enters the primary compression chamber 7. The primary compression chamber 7 is the top area of ​​the cylinder 1 isolated by the large piston 3; the driving component 5 drives the large piston 3 to move upward for primary compression, thereby increasing the pressure in the primary compression chamber 7, and pushing the air in the primary compression chamber 7 into the secondary compression chamber 8. The small piston 4 is fixed to the inner wall of the cylinder 1, and the area between the small piston 4 and the large piston 3 is the secondary compression chamber 8. When the driving component 5 drives the large piston 3 to move downward, the secondary compression chamber 8 becomes smaller and performs secondary compression. The air after the secondary compression is discharged from the exhaust port 12. During the downward movement of the large piston 3, negative pressure is generated in the primary compression chamber 7, and the air in the air inlet chamber 6 is again in the primary compression chamber 7. The above process is repeated continuously, thus realizing the two-stage compression of the air.

[0031] In some embodiments, the small piston 4 is provided with an air leakage channel 41, which is connected to an exhaust pipe 42, and the exhaust pipe 42 is sealed and inserted into the exhaust port 12. The air after secondary compression passes through the air leakage channel 41 and then is discharged through the exhaust pipe 42.

[0032] In some embodiments, a sealing plate 43 is fixed on the top of the air release channel 41, an O-ring is provided between the sealing plate 43 and the small piston 4 for sealing and fixing, an air release hole 44 connected to the secondary compression chamber 8 is provided on the sealing plate 43, and a spring member for connecting / closing the air release hole 44 and the air release channel 41 is provided in the air release channel 41. Preferably, the spring member includes a spring 45 and a one-way sealing valve 46, and the two ends of the spring 45 are respectively fixed in the air release channel 41 and on the one-way sealing valve 46, and the one-way sealing valve 46 is sealed and fitted with the sealing plate 43 under the elastic force of the spring 45. After the secondary compression, the pressure in the secondary compression chamber 8 increases, and the air inside the secondary compression chamber 8 presses down through the air release hole 44 to cause the spring 45 to press down, so that the one-way sealing valve 46 is separated from the sealing plate 43, the air release hole 44 is connected to the air release channel 41, and the air in the secondary compression chamber 8 is discharged through the air release channel 41.

[0033] In some embodiments, the outer wall of the sealing plate 43 is sleeved with a small cylinder seal 47 in sealing contact with the small piston 4. The small cylinder seal 47 ensures the sealing of the secondary compression chamber 8, and the size of the small cylinder seal 47 is small, thereby reducing the workload of the driving mechanism and improving the working efficiency of the compressor.

[0034] In some embodiments, the large piston 3 is provided with an assembly hole 31 adapted to the small piston 4, the small piston 4 is inserted into the assembly hole 31 and fixed to the inner wall of the cylinder 1, the inner wall of the assembly hole 31 is provided with a small cylinder sleeve 32, and the inner wall of the small cylinder sleeve 32 is in sealing contact with the outer wall of the small cylinder seal 47. The small cylinder sleeve 32 and the small cylinder seal 47 ensure the sealing of the secondary compression chamber 8. Preferably, a circle of sealing grooves is provided on the outer wall of the sealing plate 43, the small cylinder seal 47 is embedded in the sealing groove and its outer wall protrudes and is in sealing contact with the inner wall of the small cylinder sleeve 32. The thickness of the small cylinder sleeve 32 is greater than the movement length of the large piston 3.

[0035] In some embodiments, the large piston 3 is provided with an intake channel 33 connected to the intake chamber 6, and an intake and exhaust member connected to the intake channel 33 is provided on the top of the large piston 3 for introducing the air in the intake chamber 6 into the primary compression chamber 7, and for introducing the primary compressed air in the primary compression chamber 7 into the secondary compression chamber 8. Preferably, the intake and exhaust member includes an intake valve sheet 35, a valve plate 34 and an exhaust valve sheet 36 overlapping from top to bottom; a groove 341 is provided on the valve plate 34, an intake hole 342 connected to the intake channel 33 is provided in the groove 341, a convex piece 351 matching the groove 341 and protruding toward the valve plate 34 is provided on the intake valve sheet 35, the convex piece 351 is sealed with the groove 341, a first exhaust hole 343 and a second exhaust hole 352 are respectively provided on the valve plate 34 and the intake valve sheet 35, the first exhaust hole 343 is connected to the second exhaust hole 352, and the exhaust valve sheet 36 is sealed with the second exhaust hole 352. During the downward movement of the large piston 3, negative pressure is generated in the primary compression chamber 7, that is, the pressure in the primary compression chamber 7 is lower than the pressure in the air intake chamber 6, and the air in the air intake channel 33 enters the groove 341. The pressure difference between the inside and outside causes the air intake valve plate 35 to open, the convex plate 351 separates from the groove 341, and the air enters the primary compression chamber 7. The large piston 3 moves upward, and the air is compressed in the primary compression chamber 7. The pressure in the primary compression chamber 7 increases, and the pressure difference between the inside and outside causes the air intake valve plate 35 to close. The convex plate 351 and the groove 341 are sealed and fitted. The air in the air intake chamber 6 cannot enter the primary compression chamber 7, and the air in the primary compression chamber 7 cannot be discharged from the groove 341, so that one-way air intake is achieved. The large piston 3 moves upward, and the pressure in the primary compression chamber 7 continues to increase until the exhaust valve plate 36 opens. At this time, the primary compression is completed, the first exhaust hole 343 and the second exhaust hole 352 are connected to the air release hole 44, and the air in the primary compression chamber 7 enters the secondary compression chamber 8 to wait for compression. The large piston 3 moves downward, the pressure in the primary compression chamber 7 is lower than the pressure in the intake chamber 6, and the exhaust valve plate 36 is closed to prevent the air in the secondary compression chamber 8 from flowing back into the primary compression chamber 7, thus achieving one-way exhaust. Preferably, the valve plate 33 and the intake valve plate 34 are connected by screws.

[0036] In some embodiments, the inner wall of the cylinder 1 is sleeved with a large cylinder liner 13, and the intake and exhaust components further include a large cylinder seal 37 sleeved outside the valve plate 34 and in sealing contact with the inner wall of the large cylinder liner 13. The large cylinder liner 13 and the large cylinder seal 37 ensure the sealing of the primary compression chamber 7. The thickness of the large cylinder liner 13 is greater than the moving length of the large piston 3.

[0037] In some embodiments, a bearing 38 is connected to the bottom of the large piston 3, and the drive assembly 5 includes a drive motor 51, a crankshaft 52 connected to the drive shaft of the drive motor 51, and the crankshaft 52 is connected to the bearing 38. Driven by the drive motor 51, the large piston 3 is driven by the crankshaft 52 and the bearing 38 to reciprocate in the cylinder 1. Preferably, the drive assembly 5 is installed in a drive tank, and the drive tank is threadedly connected to the cylinder 1, so that the overall transportation of the drive assembly 5 and the compressor and the maintenance or replacement of the drive assembly 5 are convenient.

[0038] Preferably, an air filter is also installed on the cylinder 1, and the air filter is connected to the air inlet 11 through a pipeline, so that during the inhalation process of the air inlet chamber 6, the air can be filtered by the air filter before entering the air inlet chamber 6, thereby ensuring the cleanliness of the air.

[0039] Preferably, a dryer assembly is also installed on the cylinder 1 , and the dryer assembly is used to dry the air passing through the secondary compressed air. The dryer assembly is preferably located in the exhaust pipe 42 .

[0040] Preferably, the gas storage tank 9 is connected to the cylinder 1 by threads, so that it is easy to disassemble and clean the gas storage tank 9. The gas storage tank 9 is also provided with a gas storage exhaust port.

[0041] The drive motor 51 used in the present invention is an existing known electrical device and can be directly purchased and used on the market. Its structure, circuit, and control principle are all existing known technologies. Therefore, the structure, circuit, and control principle of the drive motor 51 are not described in detail here.

[0042] Finally, it should be noted that the above embodiments are only preferred embodiments of the present invention to illustrate the technical solution of the present invention, rather than limiting it, and certainly not limiting the patent scope of the present invention; although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention; that is to say, any changes or embellishments made to the main design concept and spirit of the present invention that have no substantive significance, and the technical problems they solve are still consistent with the present invention, should be included in the protection scope of the present invention; in addition, the direct or indirect application of the technical solution of the present invention in other related technical fields is also included in the patent protection scope of the present invention.

Claims

1. An air compressor, characterized in that: The invention comprises a cylinder (1), a cylinder cover (2) mounted on the top of the cylinder (1), a large piston (3) located in the cylinder (1), and a small piston (4) inserted in the large piston (3) and fixed to the inner wall of the cylinder (1); the large piston (3) is connected to a driving assembly (5) for driving the large piston (3) to reciprocate in the cylinder (1); the large piston (3) divides the cylinder (1) into an air intake chamber (6) for air buffering and a compression chamber for air compression; the compression chamber comprises a primary compression chamber (7) and a secondary compression chamber (8); an air intake port (11) connected to the air intake chamber (6) is provided on the cylinder (1); an air exhaust port (12) connected to the secondary compression chamber (8) is also provided on the cylinder (1); and the air exhaust port (12) is connected to an air storage tank (9).

2. An air compressor according to claim 1, characterized in that: The small piston (4) is provided with an air release channel (41), the air release channel (41) is connected to an exhaust pipe (42), and the exhaust pipe (42) is sealed and inserted into the exhaust port (12).

3. An air compressor according to claim 2, characterized in that: A sealing plate (43) is fixed on the top of the air leakage channel (41), and an air leakage hole (44) connected to the secondary compression chamber (8) is provided on the sealing plate (43). A spring member for connecting / closing the air leakage hole (44) and the air leakage channel (41) is provided in the air leakage channel (41).

4. An air compressor according to claim 3, characterized in that: The spring component comprises a spring (45) and a one-way sealing valve (46). Two ends of the spring (45) are respectively fixed in the air release channel (41) and on the one-way sealing valve (46). The one-way sealing valve (46) is sealed and fitted with the sealing component pressure plate (43) under the elastic force of the spring (45).

5. An air compressor according to claim 2, characterized in that: The outer wall of the sealing member pressing plate (43) is sleeved with a small cylinder sealing member (47) which is in sealing contact with the small piston (4).

6. An air compressor according to claim 5, characterized in that: The large piston (3) is provided with an assembly hole (31) adapted to the small piston (4); the small piston (4) is inserted into the assembly hole (31) and fixed to the inner wall of the cylinder (1); the inner wall of the assembly hole (31) is sleeved with a small cylinder sleeve (32); the inner wall of the small cylinder sleeve (32) is in sealing contact with the outer wall of the small cylinder seal (47).

7. An air compressor according to claim 3, characterized in that: The large piston (3) is provided with an air intake passage (33) connected to the air intake chamber (6), and the top of the large piston (3) is provided with an air intake and exhaust member connected to the air intake passage (33) for introducing the air in the air intake chamber (6) into the primary compression chamber (7), and for introducing the primary compressed air in the primary compression chamber (7) into the secondary compression chamber (8).

8. An air compressor according to claim 7, characterized in that: The air intake and exhaust components include an air intake valve sheet (35), a valve plate (34) and an air exhaust valve sheet (36) which overlap from top to bottom; a groove (341) is provided on the valve plate (34), an air intake hole (342) which is connected to the air intake channel (33) is provided in the groove (341), a convex piece (351) which is matched with the groove (341) and protrudes toward the valve plate (34) is provided on the air intake valve sheet (35), and the convex piece (351) is sealed and fitted with the groove (341); a first exhaust hole (343) and a second exhaust hole (352) are respectively provided on the valve plate (34) and the air intake valve sheet (35), the first exhaust hole (343) is connected to the second exhaust hole (352), and the exhaust valve sheet (36) is sealed and fitted with the second exhaust hole (352).

9. An air compressor according to claim 7, characterized in that: The inner wall of the cylinder (1) is sleeved with a large cylinder sleeve (13), and the air intake and exhaust components further include a large cylinder seal (37) sleeved outside the valve plate (34) and in sealing contact with the inner wall of the large cylinder sleeve (13).

10. An air compressor according to claim 1, characterized in that: The bottom of the large piston (3) is connected to a bearing (38), and the driving assembly (5) comprises a driving motor (51), a crankshaft (52) connected to the driving shaft of the driving motor (51), and the crankshaft (52) is connected to the bearing (38).

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