Oil-free air compressor piston made of composite polyaryletherketone material

Abstract

The invention relates to the technical field of air compressor pistons, in particular to an oilless air compressor piston made of a composite polyaryletherketone material, which comprises a piston mechanism, and the piston mechanism comprises a composite layer, a piston base body, a piston top, a splicing ring and a sealing piece; the piston base body and the piston top are of an integrally-formed structure. The two groups of piston base bodies and the two groups of piston tops are spliced with each other to form a piston structure; the sealing piece is arranged on the splicing face of one set of piston base body and the piston top. A sealing groove connected with the sealing piece in an inserted mode is formed in the splicing face of the other set of piston base body and the piston top. Threaded grooves are formed in the piston base body and the piston top. The two splicing rings are located on the end face of the piston base body and the end face of the piston top. A hole is formed in the splicing ring; a screw is arranged in the hole; the screw is in threaded connection with the threaded groove; the composite layer is arranged on the outer surface of the piston base body. The composite layer is additionally arranged on the outer surface of the piston base body, the high temperature resistance and the abrasion resistance of the piston are improved, and faults in the using process are reduced.

Description

Technical Field

[0001] This invention relates to the field of air compressor piston technology, and specifically to an oil-free air compressor piston made of composite polyaryletherketone material. Background Technology

[0002] Oil-free air compressors, as the name suggests, do not require lubricating oil in their compression chambers (including pistons and cylinders). Current oil-free air compressor piston designs often use aluminum alloy, which, under high-temperature conditions, cannot meet the durability requirements of oil-free air compressors due to its reciprocating motion and lack of oil lubrication and cooling. Therefore, further improvements are needed to enhance the high-temperature resistance and wear resistance of the pistons. Furthermore, existing oil-free air compressor pistons are generally one-piece molded structures; when part of the piston is damaged, the entire unit needs to be replaced, significantly increasing maintenance costs. Summary of the Invention

[0003] The purpose of this invention is to address the problems existing in the background art by proposing an oil-free air compressor piston made of composite polyaryletherketone material.

[0004] The technical solution of the present invention: an oil-free air compressor piston made of composite polyaryletherketone material, comprising: A piston mechanism includes a composite layer, a piston base, a piston top, a splicing ring, and a seal. The piston base and piston top are integrally formed. Both the piston base and piston top have two sets that are spliced ​​together to form the piston structure. The seal is located on the splicing surface of one set of piston base and piston top. The splicing surface of the other set of piston base and piston top has a sealing groove for insertion into the seal. Both the piston base and piston top have threaded grooves. Two sets of splicing rings are located on the end faces of the piston base and piston top. Holes are formed on the splicing rings. Screws are installed inside the holes. The screws are threadedly connected to the threaded grooves. The composite layer is located on the outer surface of the piston base.

[0005] Preferably, a pin hole is formed on the piston base; a piston ring groove is formed on the piston top; the piston ring groove communicates with a vent hole; and a vent hole is formed on the piston top.

[0006] Preferably, the inner walls of the piston ring grooves at the top of both sets of pistons are connected to annular frames; the inner walls of the annular frames are connected to elastic membranes; one set of annular frames has an insertion port; the other set of annular frames has a insertion tube that connects to the insertion port.

[0007] Preferably, the annular frame contains lubricant; the annular frame has extrusion holes.

[0008] Preferably, the piston base has a spiral groove inside; the spiral groove is connected to the vent hole.

[0009] Preferably, the composite layer is made of polyaryletherketone material.

[0010] Compared with the prior art, the above-mentioned technical solution of the present invention has the following beneficial technical effects: By incorporating a piston mechanism and adding a composite layer to the outer surface of the piston substrate, the piston's high-temperature resistance and wear resistance are increased, thereby extending the service life of the oil-free air compressor and reducing malfunctions during use. When the piston is partially damaged and needs to be replaced, there is no need to replace the entire piston, reducing piston maintenance costs.

[0011] By creating spiral air grooves inside the piston body and piston top, some air enters the spiral air grooves when the piston compresses air, which can carry away heat and help the piston dissipate heat. Attached Figure Description

[0012] Figure 1 A three-dimensional representation of an embodiment of the present invention Figure 1 ; Figure 2 A three-dimensional representation of an embodiment of the present invention Figure 2 ; Figure 3 This is a schematic diagram of an assembly structure according to an embodiment of the present invention. Figure 1 ; Figure 4 for Figure 3 Enlarged structural diagram at point A in the middle; Figure 5 This is a schematic diagram of an assembly structure according to an embodiment of the present invention. Figure 2 ; Figure 6 This is a schematic diagram of the connection structure between the annular frame and the elastic membrane in one embodiment of the present invention; Reference numerals: 1. Piston base; 101. Pin hole; 2. Piston top; 201. Piston ring groove; 202. Vent hole; 3. Splicing ring; 4. Screw; 5. Threaded groove; 6. Spiral air groove; 7. Composite layer; 8. Seal; 9. Insert tube; 10. Elastic membrane; 11. Annular frame; 1101. Compression hole; 1102. Insert. Detailed Implementation

[0013] Example 1, as Figures 1-3 As shown, the present invention proposes an oil-free air compressor piston made of composite polyaryletherketone material, including a piston mechanism; The piston mechanism includes a composite layer 7, a piston base 1, a piston top 2, a splicing ring 3, and a seal 8. The piston base 1 and piston top 2 are integrally formed structures. Both the piston base 1 and piston top 2 have two sets that are spliced ​​together to form the piston structure. The seal 8 is located on the splicing surface of one set of piston base 1 and piston top 2. A sealing groove for inserting the seal 8 is provided on the splicing surface of the other set of piston base 1 and piston top 2 (the seal 8 inserts into the sealing groove, achieving a seal at the splice of the two sets of piston base 1 and piston top 2). Both the piston base 1 and piston top 2 have... The piston has a threaded groove 5; two sets of splicing rings 3 are located on the end faces of the piston base 1 and the piston top 2; holes are provided on the splicing rings 3; screws 4 are provided inside the holes; screws 4 are threadedly connected to the threaded grooves 5 (the splicing rings 3 ensure the stability of the splicing of the two sets of piston base 1 and piston top 2); a composite layer 7 is provided on the outer surface of the piston base 1; the composite layer 7 is made of polyaryletherketone material; pin holes 101 are provided on the piston base 1; piston ring grooves 201 are provided on the piston top 2; piston ring grooves 201 are connected to vent holes 202; vent holes 202 are provided on the piston top 2.

[0014] It should be noted that the surface of the piston base 1 is anodized to enhance the bonding force with the composite layer 7; the composite layer 7 is injection molded using a reciprocating injection molding machine; the injection thickness is selected from 0.6mm to 2mm depending on product requirements; the effective thickness (after finishing) is selected from 0.3mm to 1mm; the clearance between the composite layer 7 and the matching piston cylinder is selected from 0.05mm to 0.15mm depending on product requirements; the injection temperature of the composite layer 7 is 400℃-450℃ depending on product requirements; and the injection pressure of the composite layer 7 is selected from 80bar to 120bar depending on product requirements.

[0015] In this embodiment, by adding a composite layer 7 to the outer surface of the piston substrate 1, the high temperature resistance and wear resistance of the piston are increased, thereby extending the service life of the oil-free air compressor and reducing failures during use.

[0016] When the piston is partially damaged and needs to be replaced, the screws 4 at the splicing ring 3 can be removed to separate the two sets of spliced ​​piston base 1 and piston top 2. Then, the piston base 1 and piston top 2 with the damaged parts can be replaced. There is no need to replace the entire piston, which reduces the maintenance cost of the piston.

[0017] Example 2, as Figures 3-6As shown, the oil-free air compressor piston made of composite polyaryletherketone material proposed in this invention, compared with Embodiment 1, further includes two sets of piston tops 2 with annular frames 11 connected to the inner walls of the piston ring grooves 201. An elastic membrane 10 is connected to the inner wall of the annular frames 11. One set of annular frames 11 has an insertion port 1102; the other set of annular frames 11 has a tube 9 that connects to the insertion port 1102 (since the vent 202 is located on one side, the air entering the vent 202 will first enter the piston ring groove 201 on one side, and then enter the piston ring groove 201 of the other set of piston tops 2 through the tube 9). The annular frames 11 contain lubricant (the lubricant is a special lubricant for oil-free air compressors, and the lubricant is a paste-like lubricant, such as lithium molybdenum disulfide grease). The annular frames 11 have extrusion holes 1101. The piston base 1 has a spiral air groove 6 inside; the spiral air groove 6 communicates with the vent 202.

[0018] In this embodiment, when the piston compresses air downwards, the pressure in the piston back cavity (crankcase) increases slightly, and some air enters the vent 202 and then the spiral air groove 6, thereby carrying away the heat inside the piston base 1 and piston top 2, helping the piston to dissipate heat; when the piston moves upwards (compression stroke), a slight negative pressure is formed in the piston back cavity, and the air in the spiral air cavity (which has absorbed heat) is drawn out into the back cavity through the vent 202 and then discharged to the outside.

[0019] When the piston compresses air downwards, some of the air in the vent 202 enters the piston ring groove 201 and squeezes the elastic diaphragm 10. The elastic diaphragm 10 squeezes the lubricant in the annular frame 11 and squeezes the lubricant out through the extrusion hole 1101. The squeezed-out lubricant enters the gap between the piston ring and the piston ring groove 201 and then contacts the inner wall of the cylinder, realizing the function of lubricant replenishment and reducing dry friction wear in the early stage of start-up.

[0020] In summary, by adding a composite layer 7 to the outer surface of the piston substrate 1, the piston's high temperature resistance and wear resistance are increased, thereby extending the service life of the oil-free air compressor and reducing malfunctions during use.

[0021] When the piston is partially damaged and needs to be replaced, the screws 4 at the splicing ring 3 can be removed to separate the two sets of spliced ​​piston base 1 and piston top 2. Then, the piston base 1 and piston top 2 with the damaged parts can be replaced. There is no need to replace the entire piston, which reduces the maintenance cost of the piston.

[0022] When the piston compresses air downwards, the pressure in the piston back cavity (crankcase) increases slightly, and some air enters the vent 202 and then the spiral air groove 6, thereby carrying away the heat inside the piston base 1 and piston top 2, helping the piston to dissipate heat. When the piston moves upwards (compression stroke), a slight negative pressure is formed in the piston back cavity, and the air in the spiral air cavity (which has absorbed heat) is drawn out into the back cavity through the vent 202 and then discharged to the outside.

[0023] When the piston compresses air downwards, some of the air in the vent 202 enters the piston ring groove 201 and squeezes the elastic diaphragm 10. The elastic diaphragm 10 squeezes the lubricant in the annular frame 11 and squeezes the lubricant out through the extrusion hole 1101. The squeezed-out lubricant enters the gap between the piston ring and the piston ring groove 201 and then contacts the inner wall of the cylinder, realizing the function of lubricant replenishment and reducing dry friction wear in the early stage of start-up.

[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited thereto. Various changes can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention.

Claims

1. An oil-free air compressor piston made of composite polyaryletherketone material, characterized in that, include: The piston mechanism includes a composite layer (7), a piston base (1), a piston top (2), a splicing ring (3), and a seal (8); the piston base (1) and the piston top (2) are integrally formed; the piston base (1) and the piston top (2) each have two sets that are spliced ​​together to form a piston structure; the seal (8) is located on the splicing surface of one set of piston base (1) and piston top (2); the other set of piston base (1) and piston top (2) has a sealing groove that is inserted into the seal (8); the piston base (1) and the piston top (2) each have a threaded groove (5); the splicing ring (3) has two sets and is located on the end face of the piston base (1) and piston top (2); the splicing ring (3) has a hole; the hole has a screw (4) inside; the screw (4) is threadedly connected to the threaded groove (5); the composite layer (7) is located on the outer surface of the piston base (1).

2. The oil-free air compressor piston made of composite polyaryletherketone material according to claim 1, characterized in that, A pin hole (101) is provided on the piston base (1); a piston ring groove (201) is provided on the piston top (2); the piston ring groove (201) is connected to the vent hole (202); and a vent hole (202) is provided on the piston top (2).

3. The oil-free air compressor piston made of composite polyaryletherketone material according to claim 1, characterized in that, The inner walls of the piston ring grooves (201) on the top (2) of both sets of pistons are connected to annular frames (11); the inner walls of the annular frames (11) are connected to elastic membranes (10); one set of annular frames (11) has a socket (1102); the other set of annular frames (11) has a tube (9) that is inserted into the socket (1102).

4. The oil-free air compressor piston made of composite polyaryletherketone material according to claim 3, characterized in that, The annular frame (11) contains lubricant; the annular frame (11) has a compression hole (1101).

5. The oil-free air compressor piston made of composite polyaryletherketone material according to claim 1, characterized in that, The piston base (1) has a spiral groove (6) inside; the spiral groove (6) is connected to the vent (202).

6. The oil-free air compressor piston made of composite polyaryletherketone material according to claim 1, characterized in that, The composite layer (7) is made of polyaryletherketone material.

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