A two-stage piston assembly for an air compressor

Abstract

The utility model relates to a kind of two-stage piston assembly for air compressor, comprising: cylinder, is equipped with piston cavity and with the communication cavity that piston cavity communicates, the diameter of communication cavity is less than the diameter of piston cavity;Exhaust check valve, is located on cylinder, and with piston cavity communicates;Bipolar piston, is equipped with piston ring and with the piston rod that piston ring connects, piston ring is movably arranged in piston cavity, piston ring divides piston cavity into primary compression chamber and secondary compression chamber, piston rod is movably arranged in communication cavity, piston rod and piston ring are equipped with with the primary gas path that primary compression chamber communicates and with the secondary gas path that secondary compression chamber communicates;First check valve, is located on primary gas path, and located in primary compression chamber;Second check valve, is located on secondary gas path, and located in secondary compression chamber. The two-stage piston realizes two-stage compression by a piston cavity, compact structure, small installation space, gas path is simple, piston compression efficiency is high, gas pressure, flow is big.

Description

Technical Field

[0001] This utility model relates to an air compressor, and more particularly to a two-stage piston assembly for an air compressor. Background Technology

[0002] Automotive air compressors are primarily used in air suspension systems (air springs). To improve compression efficiency, related technologies have proposed two-stage compressors. These two-stage compressors have two pistons rigidly connected to each other via piston carriers. The piston carriers are connected to the drive shaft via a crank-connecting rod mechanism, and the two pistons are radially opposed to each other relative to the rotation axis of the drive shaft. Examples include the dual-piston assembly, two-stage compressor, and vehicle disclosed in Chinese Patent 2025102378944. Such air compressors require a very large installation space, and air must be complexly transferred from one piston to the other through a bypass channel. Utility Model Content

[0003] To solve the above problems, this utility model provides a two-stage piston assembly for an air compressor, the specific technical solution of which is as follows: A two-stage piston assembly for an air compressor includes: a cylinder body having a piston chamber and a communicating cavity communicating with the piston chamber, the diameter of the communicating cavity being smaller than the diameter of the piston chamber; an exhaust check valve disposed on the cylinder body and communicating with the piston chamber; a bipolar piston having piston rings and a piston rod connected to the piston rings, the piston rings being movably disposed within the piston chamber, the piston rings dividing the piston chamber into a primary compression chamber and a secondary compression chamber, the piston rod being movably disposed within the communicating cavity, and the piston rod and piston rings having a primary air passage communicating with the primary compression chamber and... A secondary air passage communicating with the secondary compression chamber; a first check valve, located on the primary air passage and within the primary compression chamber; a second check valve, located on the secondary air passage and within the secondary compression chamber; wherein, when the piston ring moves toward the secondary compression chamber, air enters the primary compression chamber through the primary air passage and the first check valve, and air in the secondary compression chamber is discharged through the exhaust check valve; when the piston ring moves toward the primary compression chamber, air in the primary compression chamber enters the secondary compression chamber through the secondary air passage and the second check valve.

[0004] Preferably, it further includes: a third check valve, which is located at one end of the secondary air passage and on the piston ring, and a second check valve is located at the other end of the secondary air passage and on the piston rod.

[0005] Preferably, it further includes: a first sealing ring disposed on the piston ring and movably inserted into the piston cavity; and a second sealing ring disposed on the piston rod and movably inserted into the communicating cavity.

[0006] It also includes: a first guide ring, disposed on the piston ring and movably inserted into the piston cavity; and a second guide ring, disposed on the piston rod and movably inserted into the communicating cavity.

[0007] Compared with the prior art, the present invention has the following beneficial effects: This invention provides a two-stage piston for an air compressor that achieves two-stage compression through a single piston chamber, resulting in a more compact structure, reduced installation space, and a simpler air path. Furthermore, since the two compression stages are spatially adjacent, the piston efficiency is improved, significantly increasing the power density of the air compressor, while also increasing gas pressure and flow rate. Attached Figure Description

[0008] Figure 1 This is a schematic diagram of the structure of this application; Figure 2 This is a schematic diagram of a bipolar piston. Figure 3 This is a schematic diagram of the piston rings moving towards the secondary compression chamber; Figure 4 This is a schematic diagram of the piston rings moving towards the first-stage compression chamber. Detailed Implementation

[0009] The present invention will now be further described with reference to the accompanying drawings.

[0010] like Figures 1 to 4As shown, a two-stage piston assembly for an air compressor includes a cylinder 1, an exhaust check valve 34, a bipolar piston 2, a first check valve 31, and a second check valve 32. The cylinder 1 has a piston chamber and a communicating chamber 15 communicating with the piston chamber. The diameter of the communicating chamber 15 is smaller than the diameter of the piston chamber. The exhaust check valve 34 is mounted on the cylinder 1 and communicates with the piston chamber for discharging compressed gas. The bipolar piston 2 includes a piston ring 21 and a piston rod 22 fixed together. The piston ring 21 and the piston rod 22 are coaxially arranged. The piston rod 22 has an intake chamber at its center. The piston ring 21 is movably inserted into the piston chamber, dividing the piston chamber into two parts. The piston rod 22 is movably inserted into the connecting cavity 15, and the piston rod 22 and piston ring 21 are provided with a primary air passage 23 communicating with the primary compression chamber 11 and a secondary air passage 24 communicating with the secondary compression chamber 12. One end of the primary air passage 23 is located on the piston ring 21 and communicates with the primary compression chamber 11, and the other end of the primary air passage 23 communicates with the air inlet chamber of the piston rod 22. One end of the secondary air passage 24 is located on the piston ring 21 and communicates with the primary compression chamber 11, and the other end of the secondary air passage 24 is located on one side of the piston rod 22 and communicates with the secondary compression chamber 12. The secondary air passage 24 passes through the piston rod 22 and piston ring 21. The first check valve 31 is fixed at one end of the primary air passage 23 and is located inside the primary compression chamber 11, allowing air to enter only the primary compression chamber 11. The second check valve 32 is installed on the secondary air passage 24 and is located inside the secondary compression chamber 12, allowing air to enter the secondary compression chamber 12 only from the primary compression chamber 11. When the piston ring 21 moves toward the secondary compression chamber 12, air enters the primary compression chamber 11 through the primary air passage 23 and the first check valve 31, and the air in the secondary compression chamber 12 is discharged through the exhaust check valve 34. When the piston ring 21 moves toward the primary compression chamber 11, the air in the primary compression chamber 11 enters the secondary compression chamber 12 through the secondary air passage 24 and the second check valve 32.

[0011] To further improve sealing and prevent compressed gas backflow, a third check valve 33 is also included. The third check valve 33 is located at one end of the secondary gas passage 24 and on the piston ring 21. The third check valve 33 is located between the piston ring 21 and the piston rod 22. The second check valve 32 is located at the other end of the secondary gas passage 24 and on the piston rod 22.

[0012] To improve the sealing between the piston ring 21 and the piston cavity, and between the piston rod 22 and the connecting cavity 15, a first sealing ring 41 and a second sealing ring 42 are also included. The first sealing ring 41 is fixed on the piston ring 21 and is movably inserted into the piston cavity; the second sealing ring 42 is fixed on the piston rod 22 and is movably inserted into the connecting cavity 15.

[0013] The two-stage piston assembly also includes a first guide ring 43 and a second guide ring 44. The first guide ring 43 is fixed to the piston ring 21 and movably inserted into the piston cavity; the second guide ring 44 is fixed to the piston rod 22 and movably inserted into the connecting cavity 15. The first guide ring 43 and the second guide ring 44 can improve the coaxiality between the piston ring 21 and piston rod 22 and the piston cavity and connecting cavity 15, improve the service life of the sealing ring, and reduce failures.

[0014] The check valve is a diaphragm type.

[0015] When the secondary compression chamber 12 compresses air, the primary compression chamber 11 receives air, and when the primary compression chamber 11 compresses air, the secondary compression chamber 12 receives air. This ensures that the air is first compressed in the primary compression chamber 11 before entering the secondary compression chamber 12, increasing the gas pressure and flow rate. One revolution of the crankshaft drives one reciprocating motion of the piston, achieving two compressions and greatly improving compression efficiency.

[0016] This two-stage piston assembly has a very compact structure, which can greatly reduce the size; at the same time, this two-stage piston assembly can achieve a high air delivery rate and a high final pressure.

[0017] Furthermore, compressors equipped with two-stage piston assemblies can be easily scaled up by adding two-stage piston assemblies of the same structure.

[0018] The technical principles of this utility model have been described above with reference to specific embodiments. These descriptions are merely for explaining the principles of this utility model and should not be construed as limiting the scope of protection of this utility model in any way. Based on this explanation, those skilled in the art can readily conceive of other specific embodiments of this utility model without inventive effort, and these embodiments will all fall within the protection scope of the claims of this utility model.

Claims

1. A two-stage piston assembly for an air compressor, characterized in that, include: The cylinder body (1) is provided with a piston chamber and a communicating chamber (15) communicating with the piston chamber, wherein the diameter of the communicating chamber (15) is smaller than the diameter of the piston chamber; An exhaust check valve (34) is provided on the cylinder body (1) and communicates with the piston chamber; A bipolar piston (2) is provided with a piston ring (21) and a piston rod (22) connected to the piston ring (21). The piston ring (21) is movably disposed in the piston chamber and divides the piston chamber into a primary compression chamber (11) and a secondary compression chamber (12). The piston rod (22) is movably disposed in the communicating chamber (15). The piston rod (22) and the piston ring (21) are provided with a primary air passage (23) communicating with the primary compression chamber (11) and a secondary air passage (24) communicating with the secondary compression chamber (12). The first check valve (31) is provided on the first-stage air passage (23) and located in the first-stage compression chamber (11); The second check valve (32) is provided on the secondary air passage (24) and located in the secondary compression chamber (12); When the piston ring (21) moves toward the secondary compression chamber (12), air enters the primary compression chamber (11) through the primary air passage (23) and the first check valve (31), and the air in the secondary compression chamber (12) is discharged through the exhaust check valve (34). When the piston ring (21) moves toward the primary compression chamber (11), the air in the primary compression chamber (11) enters the secondary compression chamber (12) through the secondary air passage (24) and the second check valve (32).

2. A two-stage piston assembly for an air compressor according to claim 1, characterized in that, Also includes: The third check valve (33) is located at one end of the secondary air passage (24) and on the piston ring (21), while the second check valve (32) is located at the other end of the secondary air passage (24) and on the piston rod (22).

3. A two-stage piston assembly for an air compressor according to claim 1, characterized in that, Also includes: The first sealing ring (41) is disposed on the piston ring (21) and is movably inserted into the piston cavity; The second sealing ring (42) is provided on the piston rod (22) and is movably inserted into the communicating cavity (15).

4. A two-stage piston assembly for an air compressor according to claim 1, characterized in that, Also includes: The first guide ring (43) is disposed on the piston ring (21) and is movably inserted into the piston cavity; The second guide ring (44) is disposed on the piston rod (22) and is movably inserted into the communicating cavity (15).

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