Fully sealed, oil-free, integrated positive and negative pressure compressor for oxygen generation

Abstract

The present invention discloses a fully sealed, oil-free, integrated positive and negative pressure compressor for oxygen generation, comprising a motor, a vacuum air duct structure, a support body, a positive air duct structure, and a cylinder. The vacuum air duct structure, the support body, and the positive air duct structure are sequentially fixed to an upper surface of the motor, with one surface of the support body lacking an air duct. The present invention features a compact overall structure and can be stably mounted to a motor body, thereby fulfilling the requirements for miniaturization and compactness of the compressor. The structure of the support body is also adapted, and no air duct is provided on the surface of the support body, thus reducing the number of required sealing structures.Reliability is increased, processing is simpler, and the level of difficulty in process assembly is also significantly reduced.

Description

An oxygen production full-sealed positive and negative pressure integrated oil-free compressor TECHNICAL FIELD

[0001] The application belongs to the technical field of compressors, and particularly provides an oxygen production full-sealed positive and negative pressure integrated oil-free compressor. BACKGROUND

[0002] In an oxygen production device, an oil-free compressor is a key component. The oxygen production compressor generally adopts a cylinder and a piston to cooperate to produce compressed gas to complete the injection of high-pressure oxygen into an oxygen storage tank. The cylinder is generally installed on a support body, and a gas passage needs to be arranged on the support body to connect the cylinder and the outside space, which reduces the strength of the support body itself, and a plurality of space hole sealing connections need to be arranged, which has low reliability, and the failure rate of sealing aging and gas leakage is high. In addition, the motors and compressor structures of the same type of compressors for oxygen production devices on the market are in an open state. During operation, these open holes will suck or bring unclean air in the environment into the oxygen production link, affecting the purity of oxygen, and cannot be applied to highland sandy regions. The internal workpieces of the compressor will be affected by dust and sand particles and will be jammed, ultimately affecting the service life of the compressor.

[0003] SUMMARY

[0004] To solve the above problems, the application provides an oxygen production full-sealed positive and negative pressure integrated oil-free compressor.

[0005] To achieve the above purpose, the technical scheme adopted by the application is as follows: an oxygen production full-sealed positive and negative pressure integrated oil-free compressor, comprising a motor, a vacuum air passage structure, a support body, a positive pressure air passage structure and a cylinder, the upper surface of the motor is sequentially fixedly installed with the vacuum air passage structure, the support body and the positive pressure air passage structure, and the positive pressure air passage structure is not communicated with the support body, the surface of the support body is not provided with a gas passage, the cylinder comprises two negative pressure vacuum cylinders and two positive pressure compression cylinders, the negative pressure vacuum cylinders and the positive pressure compression cylinders are fixedly installed on the four sides of the support body in a staggered manner, the two negative pressure vacuum cylinders are communicated with the vacuum air passage structure, the two positive pressure compression cylinders are communicated with the positive pressure air passage structure, the output shaft of the motor is assembled with an eccentric wheel set, the outer surface of the eccentric wheel set is assembled with a piston connecting rod, the four piston connecting rods are respectively assembled in the corresponding cylinders, the outer end surface of the piston connecting rod is fixedly installed with a leather cup pressing plate, and the outer end of the piston connecting rod is assembled with a leather cup through the leather cup pressing plate.

[0006] The vacuum air passage structure comprises a vacuum air passage support body, the upper surface of the vacuum air passage support body is symmetrically provided with a vacuum air passage valve chamber, the side surface of the vacuum air passage support body is provided with a negative pressure exhaust air passage and a negative pressure vacuum cylinder connecting air passage which are in communication with the vacuum air passage valve chamber, two negative pressure exhaust air passages are located on the symmetric side surfaces of the vacuum air passage support body, and four negative pressure vacuum cylinder connecting air passages are uniformly located on the other side surfaces of the vacuum air passage support body.

[0007] The positive pressure air passage structure comprises a positive pressure air passage support body, the upper surface of the positive pressure air passage support body is symmetrically provided with a positive pressure air passage valve chamber, the side surface of the positive pressure air passage support body is provided with a positive pressure compressed exhaust air passage and a positive pressure compressed cylinder connecting air passage which are in communication with the positive pressure air passage valve chamber, two positive pressure compressed exhaust air passages are located on the symmetric side surfaces of the positive pressure air passage support body, and four positive pressure compressed cylinder connecting air passages are uniformly located on the other side surfaces of the positive pressure air passage support body, the positive pressure compressed exhaust air passage is connected with a pipeline joint, and the positive pressure compressed cylinder connecting air passage is in communication with a cylinder.

[0008] Further, the cylinder comprises a cylinder main body and a cylinder valve chamber cover, the cylinder valve chamber cover is assembled on the outer surface of the cylinder main body, the cylinder main body is fixedly installed on the support body, the outer surface of the cylinder main body is provided with symmetrically arranged cylinder valve chambers, the surface of the cylinder main body is provided with air exchange holes in communication with the cylinder valve chambers, the air exchange holes correspond to the negative pressure vacuum cylinder connecting air passages or the positive pressure compressed cylinder connecting air passages, the inner surface of the cylinder main body is provided with a compression cavity, a piston connecting rod is movably assembled in the compression cavity, the inner surface of the compression cavity is provided with air holes, and the air holes are located in the two cylinder valve chambers.

[0009] Further, the cylinder further comprises a negative pressure valve piece, a negative pressure valve piece pressing plate, a positive pressure valve piece and a positive pressure valve piece pressing plate, the negative pressure valve piece is fixedly installed on the inner surface of the cylinder valve chamber through the negative pressure valve piece pressing plate, the positive pressure valve piece is fixedly installed on the inner surface of the compression cavity through the positive pressure valve piece pressing plate, the negative pressure valve piece and the positive pressure valve piece shield the air holes in different cylinder valve chambers, the negative pressure valve piece pressing plate is shaped the same as the negative pressure valve piece, and the outer end of the negative pressure valve piece pressing plate is raised outward with an arc.

[0010] Further, the outer surface of the cylinder main body is provided with a cylinder sealing ring mounting groove, and a cylinder sealing ring is assembled in the cylinder sealing ring mounting groove.

[0011] Further, the cylinder main body and the leather cup are made of a Teflon material, and the inner wall of the compression cavity of the cylinder main body is provided with a self-lubricating coating.

[0012] Furthermore, the outer surface of the cylinder valve chamber cover is provided with a mesh heat dissipation structure.

[0013] Furthermore, the cup includes a positive pressure end cup and a vacuum end cup, with the opening of the positive pressure end cup facing outward and the opening of the vacuum end cup facing inward.

[0014] Furthermore, the outer end face of the piston connecting rod and the outer end face of the pressure cup plate are provided with an angle compensation structure.

[0015] Furthermore, both the upper surface of the vacuum passage support and the upper surface of the positive pressure passage support are provided with sealing element mounting grooves, and flat sealing elements are assembled in the sealing element mounting grooves. A top cover is fixedly installed on the upper surface of the positive pressure passage support.

[0016] Furthermore, the eccentric wheel assembly is composed of two eccentric wheels, which are integrally formed. The two eccentric wheels have different deflection angles relative to the output shaft of the motor, and two piston connecting rods are symmetrically mounted on the outer wall of each eccentric wheel.

[0017] The beneficial effects of using this invention are:

[0018] 1. This invention designs a structure that combines a vacuum passage structure, a support body, and a positive pressure passage structure. The assembly and cooperation of the vacuum passage structure, the support body, and the positive pressure passage structure makes the overall structure compact, which can be stably installed on the motor body and can meet the miniaturization and compactness requirements of the compressor.

[0019] 2. The present invention adjusts the structure of the support body, so that there are no air passages on its surface. This reduces the sealing structure required on the support body of existing compressors due to air passages, making the compressor a fully sealed structure with no exposed holes. This effectively prevents dust and other substances from entering the equipment, reducing the occurrence of failures such as seal aging and air leakage. In addition, the support body has higher strength because the air passages have been removed, which can better play the role of support and positioning, increasing reliability. It is also simpler to process and the assembly difficulty is greatly reduced.

[0020] 3. Through the design of vacuum passage structure, positive pressure passage structure, cylinder structure and assembly, both positive pressure compression and negative pressure vacuum modes can be formed on one machine body. Moreover, the design of the air passages on the vacuum passage structure and positive pressure passage structure without setting air passages on the support body makes the air path distribution and collection form simpler and more reliable compared with existing compressors.

[0021] 4. The present invention has designed the piston connecting rod by setting an angle compensation structure to compensate for its angle. Therefore, the outer end faces of the piston connecting rod and the pressure plate are inclined, so that the piston connecting rod maintains a rectangular compression state with the inner surface of the cylinder to the greatest extent during the stroke, thereby ensuring the compression ratio, achieving effective compression, and reducing wear on the pressure plate.

[0022] 5. The present invention is equipped with a cross-shaped piston assembly, which can work alternately in four cylinders, allowing the compressor to complete a sufficient amount of compressed air through a smaller stroke. The piston connecting rod and stroke of this structure are shorter, which can effectively reduce heat generation and vibration, thereby reducing the energy consumption of the compressor. Attached Figure Description

[0023] Figure 1 is one of the perspective views of the present invention.

[0024] Figure 2 is a second perspective view of the present invention.

[0025] Figure 3 is an exploded view of the present invention.

[0026] Figure 4 is a perspective view of the vacuum passage structure of the present invention and its cooperation with the cylinder.

[0027] Figure 5 is a front sectional view of Figure 4 of the present invention.

[0028] Figure 6 is a left view of Figure 4 of the present invention.

[0029] Figure 7 is a cross-sectional view along the AA direction in Figure 6 of this invention.

[0030] Figure 8 is a perspective view of the vacuum channel structure of the present invention.

[0031] Figure 9 is a perspective view of the positive pressure air passage structure of the present invention in conjunction with the cylinder.

[0032] Figure 10 is a perspective view of the positive pressure airway structure of the present invention.

[0033] Figure 11 is a perspective view of the support body of the present invention.

[0034] Figure 12 is one of the perspective views of the cylinder of the present invention.

[0035] Figure 13 is a second perspective view of the cylinder of the present invention.

[0036] Figure 14 is a perspective view of the motor of the present invention.

[0037] Figure 15 is a front view of the eccentric wheel assembly and piston connecting rod of the present invention.

[0038] Figure 16 is a cross-sectional view along the BB direction in Figure 15 of this invention.

[0039] Figure 17 is a cross-sectional view of the piston connecting rod of the present invention.

[0040] The attached reference numerals include: 1. Motor; 2. Vacuum passage structure; 21. Vacuum passage support; 22. Vacuum passage valve chamber; 23. Negative pressure exhaust passage; 24. Negative pressure vacuum cylinder connecting passage; 3. Support body; 4. Positive pressure passage structure; 41. Positive pressure passage support; 42. Positive pressure passage valve chamber; 43. Positive pressure compression exhaust passage; 44. Positive pressure compression cylinder connecting passage; 5. Cylinder; 51. Cylinder body; 52. Cylinder valve chamber; 53. Vent hole; 54. Negative pressure valve plate; 55. Negative pressure valve plate pressure plate; 56. Positive pressure valve plate; 57. Positive pressure valve plate pressure plate; 58. Cylinder sealing ring; 59. Cylinder valve chamber cover; 6. Eccentric wheel assembly; 7. Piston connecting rod; 8. Positive pressure end cup; 9. Vacuum end cup. Detailed Implementation

[0041] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0042] Referring to Figures 1 to 17, a fully sealed positive and negative pressure integrated oil-free compressor for oxygen production is characterized by comprising a motor 1, a vacuum passage structure 2, a support body 3, a positive pressure passage structure 4, and a cylinder 5. The upper surface of the motor 1 is sequentially fixedly mounted with the vacuum passage structure 2, the support body 3, and the positive pressure passage structure 4, and the positive pressure passage structure 4 is not connected to the support body 3. The surface of the support body 3 is not provided with passages. The cylinder 5 includes two negative pressure vacuum cylinders and two positive pressure compression cylinders. The negative pressure vacuum cylinders and the positive pressure compression cylinders are alternately fixedly mounted on the four sides of the support body 3. The two negative pressure vacuum cylinders are connected to the vacuum passage structure 2, and the two positive pressure compression cylinders are connected to the positive pressure passage structure 4. The output shaft of the motor 1 is equipped with an eccentric wheel assembly 6. The outer surface of the eccentric wheel assembly 6 is equipped with a piston connecting rod 7. The four piston connecting rods 7 are respectively assembled in the corresponding cylinders 5. A cup pressure plate is fixedly mounted on the outer end face of the piston connecting rod 7, and a cup is assembled on the outer end of the piston connecting rod 7 through the cup pressure plate.

[0043] The motor 1 provides power to drive the eccentric wheel assembly 6 to rotate, which in turn causes the piston connecting rod 7 to move repeatedly within the corresponding cylinder 5 to perform the work of drawing in and compressing gas.

[0044] The outer surface of the motor 1 housing is fitted with reserved mounting ears. The vacuum duct structure 2 is installed on some of the reserved mounting ears, and the other reserved mounting ears are used to install and fix the motor 1.

[0045] Since the surface of the support body 3 does not have an air passage, the number of sealing structures required on the support body 3 is reduced, thus reducing the occurrence of failures such as seal aging. Furthermore, the compressor as a whole is a fully sealed structure with no exposed holes. The compressor achieves a unique air exchange port (the joint connecting the negative pressure exhaust port 23 and the positive pressure compression exhaust port 43) through structural cooperation, which can effectively prevent dust and other substances from entering the compressor, reduce the wear of dynamic sealing components inside the compressor, and increase the safety and service life of the compressor.

[0046] Because the support body 3 does not have an air passage, its strength will be increased, which will enable it to play a better supporting and positioning role, and make the processing simpler and the process assembly easier.

[0047] Since the vacuum passage structure 2, the positive pressure passage structure 4, and the four cylinders 5 are respectively fixedly installed on the six surfaces of the support body 3, the overall structure of this part is compact, can be stably installed on the motor 1, and can effectively support the motor 1, and can meet the needs of miniaturization and compactness of the compressor.

[0048] Two negative pressure vacuum cylinders are symmetrically distributed on the support body 3, and two positive pressure compression cylinders are symmetrically distributed on the support body 3, for a total of four cylinders 5 arranged in a cross shape.

[0049] The eccentric wheel assembly 6 and the piston connecting rod 7 form a cross-shaped piston assembly.

[0050] As shown in Figures 4 to 8, the vacuum channel structure 2 includes a vacuum channel support body 21. Vacuum channel valve chambers 22 are symmetrically opened on the upper surface of the vacuum channel support body 21. Negative pressure exhaust channels 23 and negative pressure vacuum cylinder connecting channels 24 are opened on the side surface of the vacuum channel support body 21, both of which are connected to the vacuum channel valve chambers 22. Two negative pressure exhaust channels 23 are located on the symmetrical side surface of the vacuum channel support body 21. Four negative pressure vacuum cylinder connecting channels 24 are evenly located on the other side surface of the vacuum channel support body 21. The negative pressure exhaust channels 23 are connected to the pipe joints, and the negative pressure vacuum cylinder connecting channels 24 are connected to the cylinder 5.

[0051] The negative pressure exhaust duct 23 is connected to connectors, namely an air inlet connector and an exhaust connector, for extracting and exhausting gas.

[0052] The gas flow direction of the vacuum passage structure 2 is as follows: gas is drawn in through the air inlet and the negative pressure exhaust passage 23, flows into a negative pressure vacuum cylinder through the vacuum passage valve chamber 22 and the negative pressure vacuum cylinder connecting passage 24 on the same side, and completes the air intake work. At this time, the other negative pressure vacuum cylinder will perform gas compression work. The compressed gas is discharged from the negative pressure exhaust passage 23 and the exhaust connector on the other side through the negative pressure vacuum cylinder connecting passage 24 and the vacuum passage valve chamber 22 on the other side.

[0053] Since the two negative pressure vacuum cylinders are symmetrically distributed on the support body 3, the vacuum passage valve chamber 22 connected to the intake connector is always the intake valve chamber, and the vacuum passage valve chamber 22 connected to the exhaust connector is always the exhaust valve chamber.

[0054] As shown in Figures 9 and 10, the positive pressure air passage structure 4 includes a positive pressure air passage support body 41. A positive pressure air passage valve chamber 42 is symmetrically opened on the upper surface of the positive pressure air passage support body 41. A positive pressure compression exhaust air passage 43 and a positive pressure compression cylinder connecting air passage 44, both of which are connected to the positive pressure air passage valve chamber 42, are opened on the side surface of the positive pressure air passage support body 41. The two positive pressure compression exhaust air passages 43 are located on the symmetrical side surface of the positive pressure air passage support body 41. The four positive pressure compression cylinder connecting air passages 44 are evenly located on the other side surface of the positive pressure air passage support body 41. The positive pressure compression exhaust air passages 43 are connected to the pipeline joints, and the positive pressure compression cylinder connecting air passages 44 are connected to the cylinder 5.

[0055] The positive pressure airway structure 4 operates on the same ventilation principle as the vacuum airway structure 2.

[0056] Specifically, as shown in Figures 12 and 13, the cylinder 5 includes a cylinder body 51 and a cylinder valve chamber cover 59, with the cylinder valve chamber cover 59 mounted on the outer surface of the cylinder body 51. The cylinder body 51 is fixedly mounted on the support body 3. The outer surface of the cylinder body 51 has symmetrically arranged cylinder valve chambers 52. The surface of the cylinder body 51 has ventilation holes 53 that communicate with the cylinder valve chambers 52, and the ventilation holes 53 correspond to the negative pressure vacuum cylinder connecting passage 24 or the positive pressure compression cylinder connecting passage 44. The inner surface of the cylinder body 51 has a compression chamber, and the piston connecting rod 7 is movably mounted in the compression chamber. The inner surface of the compression chamber has vent holes, and multiple vent holes are located in the two cylinder valve chambers 52 respectively.

[0057] The piston connecting rod 7 is mounted on the output shaft of the motor 1 via the eccentric wheel set 6. As the motor 1 runs, the piston connecting rod 7 moves repeatedly in the compression chamber of the cylinder 5 along with the eccentric wheel set 6, realizing the process of negative pressure intake and compression exhaust.

[0058] There are four cylinders 5 in total. While maintaining the operating speed of each piston rod 7 and the total exhaust flow, this design results in a shorter stroke for each piston rod 7 and a shorter oscillation distance, thus ensuring the sealing performance of the piston cup for a longer period. Furthermore, the four cylinders 5 significantly increase the heat dissipation surface, effectively cooling the compressor and improving compression efficiency.

[0059] The four cylinders 5 and piston connecting rod 7 maintain a 90-degree phase difference with each other, which can balance the force acting on the output shaft of motor 1, thereby suppressing the fluctuation of operating torque and improving compression efficiency. In addition, the intake and exhaust sounds are also balanced, resulting in lower noise and less vibration.

[0060] Specifically, as shown in Figures 12 and 13, the cylinder 5 also includes a negative pressure valve plate 54, a negative pressure valve plate pressure plate 55, a positive pressure valve plate 56, and a positive pressure valve plate pressure plate 57. The negative pressure valve plate 54 is fixedly installed on the inner surface of the cylinder valve chamber 52 through the negative pressure valve plate pressure plate 55, and the positive pressure valve plate 56 is fixedly installed on the inner surface of the compression chamber through the positive pressure valve plate pressure plate 57. The negative pressure valve plate 54 and the positive pressure valve plate 56 block the vent holes in different cylinder valve chambers 52. The shape of the negative pressure valve plate pressure plate 55 is the same as that of the negative pressure valve plate 54, and the outer end of the negative pressure valve plate pressure plate 55 is raised outward in an arc.

[0061] The direction of gas flow is controlled by negative pressure valve plate 54 and positive pressure valve plate 56.

[0062] The curved lifting of the outer end of the negative pressure valve plate 55 restricts the opening angle of the negative pressure valve plate 54 during operation, thereby reducing damage to the negative pressure valve plate 54 caused by rapid and frequent opening, and extending the life of the compressor.

[0063] As shown in Figure 3, the negative pressure valve plate 54 in the cylinder valve chamber 52 has a protrusion at its installation position, and an opening auxiliary groove is provided on the protrusion so that the negative pressure valve plate 54 will not be completely pressed against the protrusion, allowing the negative pressure valve plate 54 to open smoothly.

[0064] Specifically, as shown in Figure 12, a cylinder seal ring mounting groove is provided on the outer surface of the cylinder body 51, and a cylinder seal ring 58 is assembled in the cylinder seal ring mounting groove.

[0065] The cylinder seal ring 58 cooperates with the cylinder valve chamber cover 59 to seal the cylinder valve chamber 52.

[0066] Specifically, both the cylinder body 51 and the piston cup are made of PTFE material, and the inner wall of the compression chamber of the cylinder body 51 is provided with a self-lubricating coating.

[0067] For similar compressors on the market, the cylinder generally uses a hard anodized coating to increase the wear resistance and smoothness of the cylinder interior. However, this method improves the smoothness of the cylinder inner wall but cannot form a self-lubricating effect between the two contact parts with the flexible PTFE dynamic seal component, the diaphragm cup. Even if the diaphragm cup has a self-lubricating function, its wear is still greater after long-term operation, which will lead to dynamic seal failure and reduce the compressor life when there is no oil lubrication.

[0068] The cylinder body 51 is made of the same PTFE material as the diaphragm cup, and a self-lubricating coating with a thickness of 0.05-0.08 micrometers is formed on the inner wall of the cylinder body 51 through a micro-arc oxidation process, so that the inner wall of the cylinder body 51 has the same self-lubricating effect as the diaphragm cup, thereby effectively increasing the life of the compressor.

[0069] Specifically, as shown in Figures 1 to 3, the outer surface of the cylinder valve chamber cover 59 is provided with a mesh heat dissipation structure, which can effectively dissipate heat and cool down the compressor cylinder 5 to ensure its effective operation.

[0070] Specifically, the cup includes a positive pressure cup 8 and a vacuum cup 9. The opening of the positive pressure cup 8 faces outward, and the opening of the vacuum cup 9 faces inward.

[0071] A positive pressure end cup 8 is installed on the piston connecting rod 7 inside the positive pressure compression cylinder, and a vacuum end cup 9 is installed on the piston connecting rod 7 inside the negative pressure vacuum cylinder. The opening of the positive pressure end cup 8 faces outward to better perform compression work.

[0072] Specifically, as shown in Figures 5 and 17, the outer end face of the piston connecting rod 7 and the outer end face of the pressure cup plate are provided with an angle compensation structure.

[0073] The outer end faces of the piston connecting rod 7 and the pressure cup plate are inclined, with an inclination angle of 0.85-1.25°, which is adjusted according to factors such as the actual stroke length of the piston connecting rod 7.

[0074] When the piston connecting rod 7 moves inside the cylinder 5, it will move in a figure-eight pattern, commonly known as a rocking piston. During the piston stroke from 0 to 10, due to structural limitations, there will be a tilt angle that forms a dead angle with the inner wall of the cylinder. This angle will cause a loss in the compression ratio. At the same time, because of this angle, the dynamic sealing component, the piston cup, will experience uneven and excessive wear, resulting in a reduced life. In addition, the angle will increase the clearance between the compressor piston assembly and the inner surface of the cylinder, making it impossible to achieve effective compression.

[0075] To solve the above problems, the piston connecting rod 7 and the pressure cup plate are tilted at an angle so that the piston connecting rod 7 maintains a rectangular compression state with the inner surface of the cylinder to the greatest extent during the stroke, thereby ensuring the compression ratio.

[0076] Regarding the design of piston connecting rod 7, during the operation of piston connecting rod 7, when it is at the 0 point or the apex, the outer end faces of the four piston connecting rods 7 are basically parallel to the inner surface of the corresponding cylinder 5, which reduces the dead angle between the end of piston connecting rod 7 and the cylinder 5, thereby improving compression efficiency.

[0077] Specifically, as shown in Figure 3, both the upper surface of the vacuum passage support 21 and the upper surface of the positive pressure passage support 41 are provided with sealing grooves, and flat sealing elements are installed in the sealing grooves. A top cover is fixedly installed on the upper surface of the positive pressure passage support 41 to further ensure the sealing performance of the vacuum passage structure 2 and the positive pressure passage structure 4.

[0078] Specifically, as shown in Figures 15 and 16, the eccentric wheel assembly 6 is composed of two eccentric wheels, which are integrally formed. The two eccentric wheels have different deflection angles relative to the output shaft of the motor 1, and two piston connecting rods 7 are symmetrically mounted on the outer wall of each eccentric wheel.

[0079] The two piston rods 7 connected to the upper eccentric wheel are located in the positive pressure compression cylinder, and the two piston rods 7 connected to the lower eccentric wheel are located in the negative pressure vacuum cylinder. According to Figures 3 and 16, the positional relationship of the two eccentric wheels can be seen, which can ensure that the two positive pressure compression cylinders and the two negative pressure vacuum cylinders alternately perform the work of intake and compression of gas. That is, at the same time, one positive pressure compression cylinder performs intake work, and the other positive pressure compression cylinder performs compression and exhaust work; one negative pressure vacuum cylinder performs intake work, and the other negative pressure vacuum cylinder performs compression and exhaust work.

[0080] The above content is only a preferred embodiment of the present invention. For those skilled in the art, many changes can be made in the specific implementation and application scope based on the concept of the present invention. As long as these changes do not depart from the concept of the present invention, they all fall within the protection scope of the present invention.

Claims

1. A fully sealed, integrated positive and negative pressure oil-free compressor for oxygen production, characterized in that: The utility model provides an air cylinder, which comprises a motor, a vacuum air passage structure, a support body, a positive pressure air passage structure and a cylinder, the upper surface of the motor is sequentially fixedly installed with the vacuum air passage structure, the support body and the positive pressure air passage structure, and the positive pressure air passage structure is not communicated with the support body, the surface of the support body is not provided with an air passage, the cylinder comprises two negative pressure vacuum cylinders and two positive pressure compression cylinders, the negative pressure vacuum cylinders and the positive pressure compression cylinders are fixedly installed on the four side surfaces of the support body in an interlaced mode, two negative pressure vacuum cylinders are communicated with the vacuum air passage structure, two positive pressure compression cylinders are communicated with the positive pressure air passage structure, the output shaft of the motor is assembled with an eccentric wheel group, the outer surface of the eccentric wheel group is assembled with a piston connecting rod, four piston connecting rods are respectively assembled in corresponding cylinders, the outer end surface of the piston connecting rod is fixedly installed with a leather cup pressing plate, and the outer end of the piston connecting rod is assembled with a leather cup through the leather cup pressing plate. The vacuum air passage structure comprises a vacuum air passage support body, the upper surface of the vacuum air passage support body is symmetrically provided with a vacuum air passage valve chamber, the side surface of the vacuum air passage support body is provided with a negative pressure exhaust air passage and a negative pressure vacuum cylinder connecting air passage which are communicated with the vacuum air passage valve chamber, the two negative pressure exhaust air passages are located on the symmetric side surfaces of the vacuum air passage support body, and the four negative pressure vacuum cylinder connecting air passages are uniformly located on the other side surfaces of the vacuum air passage support body. The positive pressure air passage structure comprises a positive pressure air passage support body, the upper surface of the positive pressure air passage support body is symmetrically provided with a positive pressure air passage valve chamber, the side surface of the positive pressure air passage support body is provided with a positive pressure compression exhaust air passage and a positive pressure compression cylinder connecting air passage which are communicated with the positive pressure air passage valve chamber, the two positive pressure compression exhaust air passages are located on the symmetric side surfaces of the positive pressure air passage support body, and the four positive pressure compression cylinder connecting air passages are uniformly located on the other side surfaces of the positive pressure air passage support body. The cylinder comprises a cylinder main body and a cylinder valve chamber cover, and the cylinder valve chamber cover is assembled on the outer surface of the cylinder main body, the cylinder main body is fixedly installed on the support body, the outer surface of the cylinder main body is provided with symmetrically arranged cylinder valve chambers, the surface of the cylinder main body is provided with air exchange holes which are communicated with the cylinder valve chambers, and the air exchange holes correspond to the negative pressure vacuum cylinder connecting air passages or the positive pressure compression cylinder connecting air passages, the inner surface of the cylinder main body is provided with compression cavities, and the piston connecting rods are movably assembled in the compression cavities, the inner surface of the compression cavities is provided with air holes, and a plurality of air holes are respectively located in two cylinder valve chambers. The cylinder further comprises a negative pressure valve piece, a negative pressure valve piece pressing plate, a positive pressure valve piece and a positive pressure valve piece pressing plate, the negative pressure valve piece is fixedly installed on the inner surface of the cylinder valve chamber through the negative pressure valve piece pressing plate, the positive pressure valve piece is fixedly installed on the inner surface of the compression cavity through the positive pressure valve piece pressing plate, the negative pressure valve piece and the positive pressure valve piece shield the air holes in different cylinder valve chambers, the negative pressure valve piece pressing plate is of the same shape as the negative pressure valve piece, and the outer end of the negative pressure valve piece pressing plate is raised outward with an arc.

2. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The outer surface of the cylinder body is provided with a cylinder sealing ring mounting groove, and a cylinder sealing ring is assembled in the cylinder sealing ring mounting groove.

3. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The cylinder body and the leather cup are made of Teflon material, and the inner wall of the compression cavity of the cylinder body is provided with a self-lubricating coating.

4. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The outer surface of the cylinder valve chamber cover is provided with a mesh heat dissipation structure.

5. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The leather cup includes a positive pressure end leather cup and a vacuum end leather cup, the opening of the positive pressure end leather cup faces the outer side, and the opening of the vacuum end leather cup faces the inner side.

6. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The outer end surface of the piston connecting rod and the outer end surface of the leather cup pressing plate are provided with an inclination angle supplementing structure.

7. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The upper surfaces of the vacuum air duct support body and the positive pressure air duct support body are both provided with a sealing element mounting groove, and a planar sealing element is assembled in the sealing element mounting groove.

8. The fully-sealed positive-negative pressure integrated oil-free compressor for oxygen production according to claim 1, characterized in that: The eccentric wheel group is composed of two eccentric wheels, and the two eccentric wheels are integrally formed, the deflection angles of the two eccentric wheels relative to the output shaft of the motor are different, and the outer wall of each eccentric wheel is symmetrically assembled with two piston connecting rods.

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