WO2024074050A1

WO2024074050A1 - Dry oil-free air compressor using high-speed direct drive

Info

Publication number: WO2024074050A1
Application number: PCT/CN2023/100574
Authority: WO
Inventors: 程红星; 张清源; 程志华; 林军普; 梁志齐
Original assignee: 萨震压缩机（上海）有限公司
Priority date: 2022-10-08
Filing date: 2023-06-16
Publication date: 2024-04-11
Also published as: CN115479013A; CN115479013B

Abstract

The present invention belongs to the technical field of air compressors. Disclosed is a dry oil-free air compressor using high-speed direct drive. The dry oil-free air compressor comprises a left cylinder body, wherein a middle cylinder body is fixedly connected to one end of the left cylinder body, and a right cylinder body is fixedly connected to the end of the middle cylinder body away from the left cylinder body. In the present invention, by providing a piston body, a first partition, a second partition and a control device, the control device can control an electromagnetic valve on the corresponding side to open and close during left-right movement of the piston body, such that air can be supplemented in a timely manner on the reverse side of the piston body while the piston body compresses air in the direction of movement, and air on two sides of the piston body can be compressed once every time the piston body moves back and forth, that is, by means of the adjustment of the control device and the cooperation of the piston body, it is ensured that the piston body is always in a working state of compressing air during left-right reciprocating movement of the piston body in a piston cylinder, such that the compression efficiency is improved.

Description

A dry oil-free air compressor with high-speed direct drive

Technical Field

The invention belongs to the technical field of air compressors, and in particular relates to a dry oil-free air compressor adopting high-speed direct drive.

Background technique

Dry oil-free air compressors are micro reciprocating piston compressors. The advantages of dry oil-free air compressors are simple structure, long service life, and easy to achieve large capacity and high pressure output. The air compressor drive mode is generally divided into two types: motor drive and gas turbine drive. Among them, the compressor driven by a high-speed direct drive motor has high efficiency and easy operation characteristics and is widely used. Dry oil-free air compressors use the reciprocating motion of the crank rocker to make the volume of the cylindrical cylinder change periodically. In simple terms, the piston reciprocates inside the piston cylinder to inhale air from the outside, and then the inhaled air is pushed and squeezed into high-pressure air by the piston to work.

The existing dry oil-free air compressor still has the following shortcomings during operation: first, due to the working principle of the traditional oil-free piston air compressor, when the piston reciprocates in the cylinder, the piston moves back and forth once in the cylinder, and the piston can only complete one suction and compression of the air, that is, the piston moves back and forth once and can only do work once, and the mechanical efficiency is low; secondly, in order to ensure good sealing between the piston and the cylinder body inside the air compressor to prevent air leakage, the friction between the piston and the compression cylinder is large, and the piston sealing gasket and the piston body are easily damaged after repeated use.

Summary of the invention

The object of the present invention is to provide a high-speed direct-drive dry oil-free air compressor to solve the problems raised in the above-mentioned background technology.

In order to achieve the above-mentioned purpose, the present invention provides the following technical solutions: a dry oil-free air compressor adopting high-speed direct drive, comprising a left cylinder body, one end of the left cylinder body is fixedly connected to the middle cylinder body, the end of the middle cylinder body away from the left cylinder body is fixedly connected to the right cylinder body, the middle part of the left cylinder body facing the middle cylinder body is fixedly connected to the first partition plate, and the upper and lower sides of the middle part of the first partition plate are both provided with a first check valve. Valve, a first high-pressure air chamber is opened inside the left cylinder body, a second partition plate is fixedly connected to the middle part of the right cylinder body facing one end of the middle cylinder body, and second check valves are arranged on the upper and lower sides of the middle part of the second partition plate, a second high-pressure air chamber is opened inside the right cylinder body, a piston chamber is opened inside the middle cylinder body, a piston body is movably sleeved inside the piston chamber, sealing gaskets are arranged at both ends of the side of the piston body, and a cavity is opened inside the piston body, two groups of upper and lower first solenoid valves are arranged on the side of the cavity facing the first partition plate, and two groups of upper and lower second solenoid valves are arranged on the side of the cavity facing the second partition plate, a connecting channel is arranged between the first high-pressure air chamber and the second high-pressure air chamber, and a piston rod whose middle part passes through the second partition plate and the right cylinder body is threadedly connected to one end of the piston body, an air intake channel connected to the cavity is opened inside the piston rod, and an air inlet is opened at the other end of the air intake channel, an annular groove is opened in the middle part of the side of the piston body, and a control device is arranged inside the annular groove.

Preferably, the control device includes an annular sleeve fixedly connected to the middle part of the inner walls on both sides of the annular groove, a return spring is fixedly installed inside the two groups of the annular sleeves, one end of the return spring is fixedly connected to an annular sleeve plate whose two ends are respectively movably connected to the annular sleeves on both sides, a plurality of groups of equicircularly arranged support springs are fixedly connected to the middle part of the outer side of the annular sleeve plate, one end of the support spring away from the annular sleeve plate is fixedly connected to a base, one end of the base away from the support spring is movably connected to a ball, the base is provided with a guide rod fixedly connected to the middle part of one end of the support spring and the other end is movably connected to the annular sleeve plate, a group of contact switches are fixedly installed inside the two groups of the annular sleeves, and a group of top rods compatible with the contact switches are fixedly connected to both sides of the annular sleeve plate.

Preferably, the interior of the annular groove is filled with lubricating oil, and the interior of the guide rod is provided with a through hole whose two ends are respectively connected with the interior of the base and the interior of the annular groove.

Preferably, the first check valve is a pressure check valve with a one-way flow direction from the inside of the piston chamber to the inside of the first high-pressure air chamber, and the second check valve is a pressure check valve with a one-way flow direction from the inside of the piston chamber to the inside of the second high-pressure air chamber.

Preferably, the support spring is in a compressed state, and the first solenoid valve is close to the left cylinder body. The contact switch on one side is electrically connected, and the second solenoid valve is electrically connected to the contact switch on the side close to the right cylinder body.

Preferably, the through hole is filled with sponge.

The beneficial effects of the present invention are as follows:

1. The present invention can make the ball and the annular sleeve relatively move to the left during the movement of the piston body to the right through the arrangement of the piston body, the first partition plate, the second partition plate, and the control device, so that the push rod on the left side touches the contact switch, opens the first solenoid valve electrically connected to the left contact switch, and the second solenoid valve is in a closed state, so that the air between the second partition plate and the piston cavity can be compressed to the right, and the external air can enter the first partition plate and the piston cavity along the air inlet, the air inlet channel, and the cavity to replenish the air between the first partition plate and the piston cavity. Similarly, during the movement of the piston body to the left, the first solenoid valve can be closed and the second solenoid valve can be opened through the control device, so that the air inside the first partition plate and the piston cavity can be compressed while the air between the right second partition plate and the piston cavity can be replenished, so that the piston body can compress the air once each time it moves forward and backward, that is, through the adjustment of the control device and the cooperation of the piston body, it is ensured that the piston body is always in a compressed air working state during the reciprocating movement of the piston cylinder, thereby improving the compression efficiency.

2. The present invention uses a device of lubricating oil, balls and through holes, so that the lubricating oil can be slowly transferred from the through holes to the surface of the balls by infiltration, thereby smearing the lubricating oil on the inner wall of the piston cavity, thereby effectively reducing the friction between the sealing gasket and the cylinder body, thereby ensuring the use effect of the sealing gasket.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG1 is a front view of the structure of the present invention;

FIG2 is a schematic diagram of the internal structure of the intermediate cylinder of the present invention;

FIG3 is a schematic diagram of the overall structure of the present invention;

FIG4 is an enlarged schematic diagram of the structure at point A in FIG3 ;

Fig. 5 is a schematic diagram of the B-B section in Fig. 3;

FIG. 6 is an enlarged schematic diagram of the structure at point C in FIG. 5 .

In the figure: 1. left cylinder body; 2. middle cylinder body; 3. right cylinder body; 4. first partition plate; 5. first check valve; 6. first high-pressure air chamber; 7. second partition plate; 8. second check valve; 9. second high-pressure air chamber; 10. piston chamber; 11. piston body; 12. cavity; 13. first solenoid valve; 14. second solenoid valve; 15. connecting channel; 16. piston rod; 17. air inlet channel; 18. air inlet; 19. annular groove; 20. control device; 201. annular sleeve; 202. reset spring; 203. annular sleeve plate; 204. support spring; 205. base; 206. ball; 207. guide rod; 208. contact switch; 209. push rod; 21. lubricating oil; 22 through hole.

Detailed ways

The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

As shown in Figures 1 to 3, an embodiment of the present invention provides a dry oil-free air compressor using high-speed direct drive, including a left cylinder body 1, one end of the left cylinder body 1 is fixedly connected to an intermediate cylinder body 2, the end of the intermediate cylinder body 2 away from the left cylinder body 1 is fixedly connected to a right cylinder body 3, the middle of the left cylinder body 1 toward the middle cylinder body 2 is fixedly connected to a first partition plate 4, the upper and lower sides of the middle of the first partition plate 4 are provided with a first check valve 5, a first high-pressure air cavity 6 is opened inside the left cylinder body 1, a second partition plate 7 is fixedly connected to the middle of the end of the right cylinder body 3 toward the middle cylinder body 2, the upper and lower sides of the middle of the second partition plate 7 are provided with a second check valve 8, and a second high-pressure air cavity is opened inside the right cylinder body 3 9, a piston chamber 10 is provided inside the middle cylinder body 2, a piston body 11 is movably sleeved inside the piston chamber 10, sealing gaskets are provided at both ends of the side of the piston body 11, and a cavity 12 is provided inside the piston body 11, and two upper and lower groups of first solenoid valves 13 are provided on the side of the cavity 12 facing the first partition plate 4, and two upper and lower groups of second solenoid valves 14 are provided on the side of the cavity 12 facing the second partition plate 7, a connecting channel 15 is provided between the first high-pressure air chamber 6 and the second high-pressure air chamber 9, which passes through the left cylinder body 1, the middle cylinder body 2, and the right cylinder body 3 in sequence, and one end of the piston body 11 is threadedly connected to a piston rod 16 whose middle part passes through the second partition plate 7 and the right cylinder body 3, and a movable An air inlet passage 17 communicating with the cavity 12 is formed inside the plug rod 16 , an air inlet port 18 is formed at the other end of the air inlet passage 17 , an annular groove 19 is formed in the middle of the side surface of the piston body 11 , and a control device 20 is arranged inside the annular groove 19 .

As shown in Figures 4 and 5, the control device 20 includes an annular sleeve 201 fixedly connected to the middle of the inner walls on both sides of the annular groove 19, and a return spring 202 is fixedly installed inside the two groups of annular sleeves 201. One end of the return spring 202 is fixedly connected to an annular sleeve plate 203 whose two ends are movably sleeved with the annular sleeves 201 on both sides, and a plurality of groups of support springs 204 arranged in equal circles are fixedly connected to the middle of the outer side of the annular sleeve plate 203. The end of the support spring 204 away from the annular sleeve plate 203 is fixedly connected to a base 205, and the end of the base 205 away from the support spring 204 is movably sleeved with a ball 206. The base 205 is provided with a guide rod 207 fixedly connected to the middle of one end of the support spring 204, and the other end of the guide rod 207 is movably sleeved with the annular sleeve plate 203. A group of contact switches 208 are fixedly installed inside the two groups of annular sleeves 201, and a group of top rods 209 adapted to the contact switch 208 are fixedly connected to both sides of the annular sleeve plate 203.

As shown in FIGS. 4 and 5 , the interior of the annular groove 19 is filled with lubricating oil 21 , and the interior of the guide rod 207 is provided with a through hole 22 whose two ends are respectively connected to the interior of the base 205 and the interior of the annular groove 19 .

Among them, the first check valve 5 is a pressure-type check valve with a one-way flow direction from the inside of the piston chamber 10 to the inside of the first high-pressure air chamber 6, and the second check valve 8 is a pressure-type check valve with a one-way flow direction from the inside of the piston chamber 10 to the inside of the second high-pressure air chamber 9, which prevents high-pressure air from entering the piston chamber 10 from the first high-pressure air chamber 6 and the second high-pressure air chamber 9 under the action of its own air pressure.

Among them, the support spring 204 is in a compressed state, the first solenoid valve 13 is electrically connected to the contact switch 208 close to the left cylinder body 1, and the second solenoid valve 14 is electrically connected to the contact switch close to the right cylinder body 3. In the process of the piston body 11 moving to the right, the ball 206 and the annular sleeve 203 can be relatively moved to the left, so that the top rod 209 on the left side touches the contact switch 208, and the first solenoid valve 13 electrically connected to the left contact switch 208 is opened, while the second solenoid valve 8 is in a closed state. Therefore, in the process of the piston body 11 moving to the right, the air between the second partition plate 7 and the piston chamber 10 can be compressed to the right, so that the high-pressure air opens the second check valve 8 and enters the second high-pressure air chamber 9, and The first solenoid valve 13 is opened, so that the external air can enter between the first partition plate 4 and the piston chamber 10 along the air inlet 18, the air inlet channel 17, and the cavity 12, and the air between the first partition plate 4 and the piston chamber 10 is replenished. Similarly, when the piston body 11 moves to the left, the first solenoid valve 13 can be closed and the second solenoid valve 14 can be opened, so that the air inside the first partition plate 4 and the piston chamber 10 is compressed, and the air between the second partition plate 7 on the right and the piston chamber 10 is replenished, so as to realize automatic control.

Among them, the through hole 22 is filled with sponge, which can enable the lubricating oil 21 to be slowly transferred from the through hole 22 to the surface of the ball 206 by infiltration, so that the lubricating oil is applied to the inner wall of the piston chamber 10, thereby effectively reducing the friction between the sealing gasket and the cylinder body, thereby ensuring the use effect of the sealing gasket.

Working principle and usage process:

During the operation of the air compressor, when the piston rod 16 pushes the piston body 11 to move to the right, due to the pressure between the ball 206 and the inner wall of the intermediate cylinder body 2 under the elastic support of the support spring 204, the ball 206 and the annular sleeve 203 will move relatively to the left during the movement of the piston body 11 to the right, so that the push rod 209 on the left touches the contact switch 208, opens the first solenoid valve 13 electrically connected to the left contact switch 208, and the second solenoid valve 8 is in a closed state. Therefore, at this time, during the movement of the piston body 11 to the right, it can not only compress the air between the second partition plate 7 and the piston cavity 10 to the right, so that the high-pressure air opens the second check valve 8 and enters the second high-pressure air cavity 9, but also open the first solenoid valve 13, so that the external air can enter between the first partition plate 4 and the piston cavity 10 along the air inlet 18, the air inlet channel 17, and the cavity 12, so as to replenish the air between the first partition plate 4 and the piston cavity 10. Similarly, when the piston body 11 moves to the left, the first solenoid valve 13 can be closed and the second solenoid valve 14 can be opened to complete the air compression of the first partition plate 4 and the piston chamber 10 while replenishing the air between the second partition plate 7 on the right and the piston chamber 10. The high-pressure air squeezed during the reciprocating motion of the piston body 11 enters the first high-pressure air chamber 6 and the second high-pressure air chamber 9 respectively and can then be combined through the connecting channel 15, thereby being transported to the air storage tank from the high-pressure air pipe installed on the outer surface of the left cylinder body 1. When the ball 206 moves on the inner wall of the piston chamber 10, the lubricating oil 21 filled in the inner wall of the annular groove 19 will infiltrate the sponge inside the through hole 22, and the lubricating oil 21 will be sucked from the surface of the ball 206. The lubricating oil is applied to the inner wall of the piston chamber 10, thereby effectively reducing the friction between the sealing gasket and the cylinder body, thereby ensuring the use effect of the sealing gasket.

It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

A high-speed direct-drive dry oil-free air compressor comprises a left cylinder body (1), one end of the left cylinder body (1) is fixedly connected to an intermediate cylinder body (2), and the end of the intermediate cylinder body (2) away from the left cylinder body (1) is fixedly connected to a right cylinder body (3), characterized in that: the middle of the left cylinder body (1) facing the middle cylinder body (2) is fixedly connected to a first partition plate (4), the upper and lower sides of the middle of the first partition plate (4) are both provided with a first check valve (5), the interior of the left cylinder body (1) is provided with a first high-pressure air chamber (6), the middle of the right cylinder body (3) facing the middle cylinder body (2) is fixedly connected to a second partition plate (7), the upper and lower sides of the middle of the second partition plate (7) are both provided with a second check valve (8), the interior of the right cylinder body (3) is provided with a second high-pressure air chamber (9), the interior of the intermediate cylinder body (2) is provided with a piston chamber (10), the interior of the piston chamber (10) is movably sleeved with a piston body (11), and the two sides of the side of the piston body (11) are provided with a piston body (11). Both ends are provided with sealing gaskets, and a cavity (12) is provided inside the piston body (11). The cavity (12) is provided with two upper and lower groups of first solenoid valves (13) on the side facing the first partition plate (4), and the cavity (12) is provided with two upper and lower groups of second solenoid valves (14) on the side facing the second partition plate (7). A connecting channel (15) is provided between the first high-pressure air chamber (6) and the second high-pressure air chamber (9), which passes through the left cylinder body (1), the middle cylinder body (2), and the right cylinder body (3) in sequence. One end of the piston body (11) is threadedly connected to a piston rod (16) whose middle part passes through the second partition plate (7) and the right cylinder body (3). An air intake channel (17) connected to the cavity (12) is provided inside the piston rod (16), and an air intake port (18) is provided at the other end of the air intake channel (17). An annular groove (19) is provided in the middle of the side surface of the piston body (11), and a control device (20) is provided inside the annular groove (19).
According to claim 1, a high-speed direct-drive dry oil-free air compressor is characterized in that: the control device (20) includes an annular sleeve (201) fixedly connected to the middle of the inner wall on both sides of the annular groove (19), and the inside of the two groups of the annular sleeves (201) are fixedly installed with a return spring (202), one end of the return spring (202) is fixedly connected to an annular sleeve plate (203) whose two ends are movably sleeved with the annular sleeves (201) on both sides, and the middle part of the outer side of the annular sleeve plate (203) is fixedly connected to a plurality of groups of equicircularly arranged support springs (204), and the support springs (204) are away from the annular sleeves (201). One end of the annular sleeve (203) is fixedly connected to a base (205), and one end of the base (205) away from the support spring (204) is movably sleeved with a ball (206). The base (205) is provided with a guide rod (207) fixedly connected to the middle of one end of the support spring (204), and the other end of the guide rod is movably sleeved with the annular sleeve (203). A group of contact switches (208) are fixedly installed inside the two groups of annular sleeves (201), and a group of top rods (209) adapted to the contact switches (208) are fixedly connected to both sides of the annular sleeve (203).
According to the high-speed direct-drive dry oil-free air compressor of claim 2, the feature is that the interior of the annular groove (19) is filled with lubricating oil (21), and the interior of the guide rod (207) is provided with a through hole (22) whose two ends are respectively connected to the interior of the base (205) and the interior of the annular groove (19).
According to the high-speed direct-drive dry oil-free air compressor of claim 1, the first check valve (5) is a pressure check valve with a one-way flow direction from the inside of the piston chamber (10) to the inside of the first high-pressure air chamber (6), and the second check valve (8) is a pressure check valve with a one-way flow direction from the inside of the piston chamber (10) to the inside of the second high-pressure air chamber (9).
According to a high-speed direct-drive dry oil-free air compressor as described in claim 2, it is characterized in that: the support spring (204) is in a compressed state, the first solenoid valve (13) is electrically connected to the contact switch (208) on the side close to the left cylinder body (1), and the second solenoid valve (14) is electrically connected to the contact switch on the side close to the right cylinder body (3).
The high-speed direct-drive dry oil-free air compressor according to claim 3 is characterized in that the through hole (22) is filled with sponge.