阅读说明：本技术 一种真空及正压一体式四缸压缩机 (Vacuum and positive pressure integrated four-cylinder compressor ) 是由 曹大林 于 2021-02-02 设计创作，主要内容包括：本发明涉及一种真空及正压一体式四缸压缩机,包括机壳、气缸组件及驱动机构；所述机壳及气缸组件侧壁内部设置有正压气流通道及负压气流通道；所述气缸组件包括一对正压缸及一对负压缸,内部均具有活塞并形成压缩室,一对所述正压缸的压缩室与正压气流通道相连通,一对所述负压缸的压缩室与负压气流通道相连通；所述驱动机构与活塞端部连接并驱动活塞往复运动；本发明主要应用于微小型制氧领域中,与传统的双缸压缩机相比,不仅可以提供正压,同时还可输出负压,实现制氧机内部的分子筛加压吸附,并通过真空将吸附在分子筛上的氮彻底脱附,提升了分子筛的吸附能效,无需更多的压缩空气以及更高的吸附压力去弥补,压缩机功率小,能耗低。(The invention relates to a vacuum and positive pressure integrated four-cylinder compressor, which comprises a shell, a cylinder assembly and a driving mechanism, wherein the shell is provided with a cylinder cover; a positive pressure airflow channel and a negative pressure airflow channel are arranged in the side walls of the shell and the cylinder assembly; the air cylinder assembly comprises a pair of positive pressure cylinders and a pair of negative pressure cylinders, pistons are arranged in the positive pressure cylinders, compression chambers are formed, the compression chambers of the positive pressure cylinders are communicated with the positive pressure air flow channel, and the compression chambers of the negative pressure cylinders are communicated with the negative pressure air flow channel; the driving mechanism is connected with the end part of the piston and drives the piston to reciprocate; the invention is mainly applied to the field of micro oxygen generation, and compared with the traditional double-cylinder compressor, the invention not only can provide positive pressure, but also can output negative pressure, realizes the pressurized adsorption of the molecular sieve in the oxygen generator, and completely desorbs the nitrogen adsorbed on the molecular sieve through vacuum, improves the adsorption energy efficiency of the molecular sieve, does not need more compressed air and higher adsorption pressure to compensate, and has small power and low energy consumption.)

1. The utility model provides a four jar compressors of vacuum and malleation integral type which characterized in that: comprises a shell, a cylinder component arranged in the shell and a driving mechanism for driving the cylinder component to work synchronously; a positive pressure air flow channel and a negative pressure air flow channel are arranged in the side walls of the shell and the cylinder assembly, and a positive pressure end air inlet and a positive pressure end air outlet which are communicated with the positive pressure air flow channel, and a negative pressure suction inlet and a negative pressure discharge port which are communicated with the negative pressure air flow channel are arranged on the outer wall of the shell and the cylinder assembly; the air cylinder assembly comprises a pair of positive pressure cylinders and a pair of negative pressure cylinders which are identical in structure and are sequentially distributed at intervals of 90 degrees, pistons are arranged in the cylinders to form compression chambers, the compression chambers of the pair of positive pressure cylinders are communicated with the positive pressure air flow channel, and the compression chambers of the pair of negative pressure cylinders are communicated with the negative pressure air flow channel; the driving mechanism is connected with the end part of the piston and drives the piston to reciprocate.

2. The vacuum and positive pressure integrated four-cylinder compressor according to claim 1, wherein: the positive pressure cylinder and the negative pressure cylinder respectively comprise a cylinder sleeve fixed on the outer wall of the shell, a cylinder cover fixed on the outer side end of the cylinder sleeve, a piston capable of realizing reciprocating motion and a valve plate arranged between the piston and the cylinder cover; the driving mechanism comprises a motor, a motor shaft and an eccentric wheel arranged on the motor shaft; and the four pistons are matched with the eccentric wheel in a rotating inserting sleeve mode.

3. The vacuum and positive pressure integrated four-cylinder compressor according to claim 2, wherein: the piston is arranged in an integrated structure and comprises a piston head embedded in the inner side of the cylinder sleeve and a connecting rod part extending to the inner side end of the shell, the piston head is provided with a leather cup and a leather cup pressing plate and forms a compression chamber with the valve plate, and the connecting rod part is matched with the eccentric wheel rotating plug bush; and a first chamber and a second chamber are formed between the valve plate and the cylinder cover, and air flows through the first chamber and the second chamber respectively before and after being compressed.

4. The vacuum and positive pressure integrated four-cylinder compressor according to claim 3, wherein: the valve plate is provided with air vents on the end faces, opposite to the first cavity and the second cavity, of the valve plate, valve plates used for achieving one-way air flow are arranged at the end faces, opposite to the first cavity, of the air vents, deviated to one side of the piston, of the air vents, opposite to the second cavity, of the air vents, deviated to one side of the cylinder cover, and the valve plates are locked and fixed on the end faces of the valve plate through screws.

5. The vacuum and positive pressure integrated four-cylinder compressor according to claim 4, wherein: the outside end of the valve block is also provided with a reinforcing plate and a valve gasket which are used for preventing the valve block from being pressed and deformed, and the reinforcing plate and the valve gasket are sequentially penetrated, locked and fixed through screws.

6. The vacuum and positive pressure integrated four-cylinder compressor according to claim 4, wherein: the shell comprises a base, an installation shell, an upper top cover and a sealing cover which are sequentially arranged from bottom to top; the mounting shell comprises a lower chamber and an upper chamber for mounting the cylinder assembly; the positive pressure end air inlet and the positive pressure end air outlet are oppositely arranged on the side wall of the upper top cover, and the negative pressure suction inlet and the negative pressure discharge outlet are oppositely arranged at the lower end part of the side wall of the mounting shell and are communicated with the lower chamber; the positive pressure airflow channel is arranged in the upper top cover and the mounting shell, the negative pressure airflow channel is arranged in the mounting shell and penetrates through the corresponding cylinder sleeve and the corresponding valve plate respectively, and the communication is realized through the first cavity, the compression chamber and the second cavity.

7. The vacuum and positive pressure integrated four-cylinder compressor according to claim 6, wherein: the positive pressure end air inlet and the positive pressure end air outlet are arranged on the same side of the shell where the pair of negative pressure cylinders are arranged, and the negative pressure suction inlet and the negative pressure discharge outlet are arranged on the same side of the shell where the pair of positive pressure cylinders are arranged.

8. The vacuum and positive pressure integrated four-cylinder compressor according to claim 7, wherein: the positive pressure air flow channel comprises a positive pressure suction confluence flow channel, a positive pressure suction flow channel, a positive pressure discharge flow channel and a positive pressure discharge confluence flow channel; the positive pressure suction confluence flow channel is arranged between the upper end of the upper top cover and the sealing cover and is communicated with the positive pressure end air inlet; the positive pressure suction flow passages are symmetrically arranged along a vertical plane where the arrangement directions of the pair of negative pressure cylinders are located, sequentially penetrate through the mounting shell from the lower end face of the upper top cover, are reversed by 90 degrees and penetrate through the cylinder sleeve and the valve plate, and are communicated with the first cavity; the first chamber is communicated with the second chamber through a vent hole provided with a valve plate; the positive pressure discharge flow channel and the positive pressure suction flow channel are symmetrically arranged along a vertical plane where the positive pressure cylinders are arranged, sequentially penetrate through the valve plate, the cylinder sleeve and the mounting shell and the lower end face of the top cover in a 90-degree reversing manner through the second cavity; the positive pressure discharge confluence flow channel is arranged between the upper end of the upper top cover and the sealing cover and is communicated with the positive pressure end air outlet.

9. The vacuum and positive pressure integrated four-cylinder compressor according to claim 7, wherein: the negative pressure airflow channel comprises a negative pressure suction confluence flow channel, a negative pressure suction flow channel, a negative pressure discharge flow channel and a negative pressure discharge confluence flow channel; the negative pressure suction converging flow channel and the negative pressure discharge converging flow channel are arranged in a separated mode and form a lower cavity together, the negative pressure suction converging flow channel is communicated with the negative pressure suction inlet, and the negative pressure discharge converging flow channel is communicated with the negative pressure discharge outlet; the negative pressure suction flow channel sequentially penetrates through the mounting shell, the cylinder sleeve and the valve plate from the negative pressure suction confluence flow channel to realize communication with the first cavity; the first chamber is communicated with the second chamber through a vent hole provided with a valve plate; and the negative pressure discharge flow channel sequentially penetrates through the valve plate, the cylinder sleeve and the mounting shell by the second chamber to be communicated with the negative pressure discharge confluence flow channel.

10. The vacuum and positive pressure integrated four-cylinder compressor according to claims 2 to 9, wherein: the cylinder cover is characterized in that ribs for reinforcing the structure and facilitating heat dissipation of the cylinder assembly are arranged on the end face of the outer side of the cylinder cover.

Technical Field

The invention relates to the technical field of oxygen production by a microminiature molecular sieve, in particular to a vacuum and positive pressure integrated four-cylinder compressor.

Background

The oil-free air compressor is a core component commonly used in the field of micro-molecular sieve oxygen production at present, and has the functions of providing a continuous positive pressure air source, enabling compressed air to act on the molecular sieve in the oxygen production process, and selectively adsorbing nitrogen by the molecular sieve, so that the effect of nitrogen-oxygen separation is achieved to produce oxygen. The working principle of oxygen production by adopting the pressure swing adsorption method is as follows: at present, two (adsorption) towers and a plurality of (adsorption) towers are commonly used for oxygen generation, and the purpose is that when a molecular sieve in one tower is saturated by adsorbed nitrogen, compressed air is diverted to the other (adsorption) tower for nitrogen and oxygen separation, and the adsorption tower saturated by adsorption discharges nitrogen under the action of internal pressure, so that the molecular sieve is desorbed, the original adsorption function is recovered, next adsorption is carried out, and oxygen is continuously prepared in turn; the existing traditional oil-free compressor is provided with 2 cylinder bodies, on one hand, the balance operation is kept, on the other hand, the flow of compressed gas is increased, one end of the compressor is an air suction inlet, and the other end of the compressor is a compressed air outlet; the traditional double-cylinder compressor can only provide compressed air, and the molecular sieve cannot desorb nitrogen adsorbed each time thoroughly in the processes of long-term pressurized adsorption and normal-pressure nitrogen desorption, so that the oxygen concentration is reduced, more compressed air and higher adsorption pressure are required to compensate, and the compressor has high power, high temperature and high energy consumption; therefore, the invention develops a vacuum and positive pressure integrated four-cylinder compressor to solve the problems in the prior art, and a technical scheme which is the same as or similar to that of the invention is not found through retrieval.

Disclosure of Invention

The invention aims to: provides a vacuum and positive pressure integrated four-cylinder compressor, which aims to solve the problem that the nitrogen desorption of the compressor is not thorough and the oxygen concentration is reduced in the field of micro molecular sieve oxygen production in the prior art.

The technical scheme of the invention is as follows: a vacuum and positive pressure integrated four-cylinder compressor comprises a shell, a cylinder assembly arranged in the shell and a driving mechanism for driving the cylinder assembly to work synchronously; a positive pressure air flow channel and a negative pressure air flow channel are arranged in the side walls of the shell and the cylinder assembly, and a positive pressure end air inlet and a positive pressure end air outlet which are communicated with the positive pressure air flow channel, and a negative pressure suction inlet and a negative pressure discharge port which are communicated with the negative pressure air flow channel are arranged on the outer wall of the shell and the cylinder assembly; the air cylinder assembly comprises a pair of positive pressure cylinders and a pair of negative pressure cylinders which are identical in structure and are sequentially distributed at intervals of 90 degrees, pistons are arranged in the cylinders to form compression chambers, the compression chambers of the pair of positive pressure cylinders are communicated with the positive pressure air flow channel, and the compression chambers of the pair of negative pressure cylinders are communicated with the negative pressure air flow channel; the driving mechanism is connected with the end part of the piston and drives the piston to reciprocate.

Preferably, the positive pressure cylinder and the negative pressure cylinder respectively comprise a cylinder sleeve fixed on the outer wall of the shell, a cylinder cover fixed on the outer side end of the cylinder sleeve, a piston capable of realizing reciprocating motion, and a valve plate arranged between the piston and the cylinder cover; the driving mechanism comprises a motor, a motor shaft and an eccentric wheel arranged on the motor shaft; and the four pistons are matched with the eccentric wheel in a rotating inserting sleeve mode.

Preferably, the piston is arranged in an integral structure and comprises a piston head embedded in the inner side of the cylinder sleeve and a connecting rod part extending to the inner side end of the shell, the piston head is provided with a leather cup and a leather cup pressing plate and forms a compression chamber with the valve plate, and the connecting rod part is matched with the eccentric wheel rotating plug bush; and a first chamber and a second chamber are formed between the valve plate and the cylinder cover, and air flows through the first chamber and the second chamber respectively before and after being compressed.

Preferably, the valve plate is provided with vent holes on the end faces opposite to the first chamber and the second chamber, valve plates for realizing unidirectional air flow are arranged on the end faces of the vent holes opposite to the first chamber and the side faces of the vent holes opposite to the second chamber, which are deviated to the cylinder cover, and the valve plates are locked and fixed on the end faces of the valve plate through screws.

Preferably, the valve block outside end still is provided with reinforcing plate and the valve gasket that is used for preventing the valve block from receiving the pressure deformation to it is fixed to run through the locking in proper order through the screw.

Preferably, the casing comprises a base, an installation casing, an upper top cover and a sealing cover which are sequentially arranged from bottom to top; the mounting shell comprises a lower chamber and an upper chamber for mounting the cylinder assembly; the positive pressure end air inlet and the positive pressure end air outlet are oppositely arranged on the side wall of the upper top cover, and the negative pressure suction inlet and the negative pressure discharge outlet are oppositely arranged at the lower end part of the side wall of the mounting shell and are communicated with the lower chamber; the positive pressure airflow channel is arranged in the upper top cover and the mounting shell, the negative pressure airflow channel is arranged in the mounting shell and penetrates through the corresponding cylinder sleeve and the corresponding valve plate respectively, and the communication is realized through the first cavity, the compression chamber and the second cavity.

Preferably, the positive pressure end air inlet and the positive pressure end air outlet are arranged on the same side of the shell where the pair of negative pressure cylinders are arranged, and the negative pressure suction inlet and the negative pressure discharge outlet are arranged on the same side of the shell where the pair of positive pressure cylinders are arranged.

Preferably, the positive pressure gas flow channel comprises a positive pressure suction confluence flow channel, a positive pressure suction flow channel, a positive pressure discharge flow channel and a positive pressure discharge confluence flow channel; the positive pressure suction confluence flow channel is arranged between the upper end of the upper top cover and the sealing cover and is communicated with the positive pressure end air inlet; the positive pressure suction flow passages are symmetrically arranged along a vertical plane where the arrangement directions of the pair of negative pressure cylinders are located, sequentially penetrate through the mounting shell from the lower end face of the upper top cover, are reversed by 90 degrees and penetrate through the cylinder sleeve and the valve plate, and are communicated with the first cavity; the first chamber is communicated with the second chamber through a vent hole provided with a valve plate; the positive pressure discharge flow channel and the positive pressure suction flow channel are symmetrically arranged along a vertical plane where the positive pressure cylinders are arranged, sequentially penetrate through the valve plate, the cylinder sleeve and the mounting shell and the lower end face of the top cover in a 90-degree reversing manner through the second cavity; the positive pressure discharge confluence flow channel is arranged between the upper end of the upper top cover and the sealing cover and is communicated with the positive pressure end air outlet.

Preferably, the negative pressure airflow channel comprises a negative pressure suction confluence flow channel, a negative pressure suction flow channel, a negative pressure discharge flow channel and a negative pressure discharge confluence flow channel; the negative pressure suction converging flow channel and the negative pressure discharge converging flow channel are arranged in a separated mode and form a lower cavity together, the negative pressure suction converging flow channel is communicated with the negative pressure suction inlet, and the negative pressure discharge converging flow channel is communicated with the negative pressure discharge outlet; the negative pressure suction flow channel sequentially penetrates through the mounting shell, the cylinder sleeve and the valve plate from the negative pressure suction confluence flow channel to realize communication with the first cavity; the first chamber is communicated with the second chamber through a vent hole provided with a valve plate; and the negative pressure discharge flow channel sequentially penetrates through the valve plate, the cylinder sleeve and the mounting shell by the second chamber to be communicated with the negative pressure discharge confluence flow channel.

Preferably, ribs for reinforcing the structure and facilitating heat dissipation of the cylinder assembly are arranged on the end face of the outer side of the cylinder cover.

Compared with the prior art, the invention has the advantages that:

the invention is mainly applied to pressure swing adsorption oxygen generation in the field of microminiature oxygen generation, compared with the traditional double-cylinder compressor, the invention not only can provide positive pressure (compressed air), but also can output negative pressure (vacuum) to realize the pressurized adsorption of the molecular sieve in the oxygen generator, and completely desorb the nitrogen adsorbed on the molecular sieve through the vacuum, thereby improving the adsorption energy efficiency of the molecular sieve, needing no more compressed air and higher adsorption pressure to compensate, and having small power and low energy consumption of the compressor; meanwhile, the integrated four-cylinder structure is adopted, so that the whole structure design is compact, the space occupancy rate is small, and the vibration in the working process can be reduced by the symmetrical balanced structure.

Drawings

The invention is further described with reference to the following figures and examples:

FIG. 1 is a schematic structural diagram of a vacuum and positive pressure integrated four-cylinder compressor according to the present invention;

FIG. 2 is an exploded view of a vacuum and positive pressure integrated four cylinder compressor according to the present invention;

FIG. 3 is a cross-sectional view of a vacuum and positive pressure integrated four-cylinder compressor of the present invention, cut along the direction in which a pair of negative pressure cylinders are installed;

FIG. 4 is a cross-sectional view of a vacuum and positive pressure integrated four-cylinder compressor of the present invention cut along the direction of a pair of positive pressure cylinders;

FIG. 5 is a cross-sectional view of a vacuum and positive pressure integrated four-cylinder compressor according to the present invention taken along a direction perpendicular to a central axis of a motor shaft;

FIG. 6 is an enlarged partial cross-sectional view of the cylinder assembly of the present invention;

FIG. 7 is an exploded view of the cylinder assembly of the present invention;

FIG. 8 is an exploded view of the arrangement of the valve plate and the cylinder head and a circuit diagram of the internal air passing through the vent holes;

FIG. 9 is a schematic view of the connection structure of the driving mechanism and the piston according to the present invention;

FIG. 10 is a schematic structural view of the mounting housing of the present invention;

fig. 11 is a schematic view of the arrangement structure of the local positive pressure suction flow channel, the negative pressure suction conflux flow channel and the local negative pressure suction flow channel inside the mounting case according to the present invention;

FIG. 12 is a schematic view of a planar flow structure of the positive pressure air flow passage of the present invention (wherein "X" in the inner circular hole of the mounting case indicates a downward flow and "·" indicates an upward flow);

FIG. 13 is a flow diagram of the positive pressure gas flow path along one side of the positive pressure cylinder in accordance with the present invention;

FIG. 14 is a schematic view of the air flow circuit inside the upper lid of the present invention;

FIG. 15 is a flow diagram of the negative pressure airflow path along one side of the negative pressure cylinder according to the present invention.

Wherein: 1. a housing;

11. the air conditioner comprises a base, a mounting shell, a base seat 12, a mounting shell 13, an upper top cover 14, a sealing cover 15, a positive pressure end air inlet 16, a positive pressure end air outlet 17, a negative pressure suction inlet 18 and a negative pressure discharge outlet;

121. a lower chamber, 122, an upper chamber;

2. a cylinder assembly;

201. a positive pressure cylinder 202, a negative pressure cylinder;

21. the piston compression mechanism comprises a cylinder sleeve, 22, a cylinder cover, 23, a piston, 24, a valve plate, 25, a compression chamber, 26, a first cavity, 27, a second cavity, 28, a leather cup, 29 and a leather cup pressing plate;

231. a piston head portion 232, a connecting rod portion;

241. vent hole 242, valve plate 243, reinforcing plate 244, valve gasket;

3. a drive mechanism;

31. a motor 32, a motor shaft 33 and an eccentric wheel;

4. a positive pressure gas flow passage;

41. a positive pressure suction confluence channel 42, a positive pressure suction channel 43, a positive pressure discharge channel 44, a positive pressure discharge confluence channel;

5. a negative pressure airflow channel;

51. a negative pressure suction confluence flow path 52, a negative pressure suction flow path 53, a negative pressure discharge flow path 54, and a negative pressure discharge confluence flow path.

Detailed Description

The present invention will be further described in detail with reference to the following specific examples:

as shown in fig. 1-4, a vacuum and positive pressure integrated four-cylinder compressor, which is mainly applied to an oxygen generator, compresses air and continuously outputs negative pressure to generate high-concentration oxygen, and structurally comprises a casing 1, a cylinder assembly 2 installed in the casing 1, and a driving mechanism 3 for driving the cylinder assembly 2 to synchronously work; a positive pressure air flow channel 4 and a negative pressure air flow channel 5 are arranged in the side wall of the machine shell 1, and a positive pressure end air inlet 15 and a positive pressure end air outlet 16 communicated with the positive pressure air flow channel 4, and a negative pressure suction inlet 17 and a negative pressure discharge outlet 18 communicated with the negative pressure air flow channel 5 are arranged on the outer wall of the machine shell; the cylinder assembly 2 comprises a pair of positive pressure cylinders 201 and a pair of negative pressure cylinders 202 which are identical in structure and are distributed at intervals in sequence at 90 degrees, pistons 23 are arranged in the cylinders to form compression chambers 25, the compression chambers 25 of the positive pressure cylinders 201 are communicated with the positive pressure airflow channel 4, and the compression chambers 25 of the negative pressure cylinders 202 are communicated with the negative pressure airflow channel 5; meanwhile, the positive pressure end air inlet 15 and the positive pressure end air outlet 16 are arranged on the same side of the casing 1 where the pair of negative pressure cylinders 202 are arranged, and the negative pressure suction inlet 17 and the negative pressure discharge outlet 18 are arranged on the same side of the casing 1 where the pair of positive pressure cylinders 201 are arranged; the driving mechanism 3 is connected to an end of the piston 23 and drives the piston 23 to reciprocate.

With regard to the cylinder assembly 2, the driving mechanism 3, the casing 1, the positive pressure airflow passage 4, and the negative pressure airflow passage 5, more specific configurations thereof are as follows:

first, the cylinder assembly 2 (a pair of positive pressure cylinders 201 and a pair of negative pressure cylinders 202):

as shown in fig. 5, the cylinder assembly 2 includes a pair of oppositely disposed positive pressure cylinders 201 and a pair of oppositely disposed negative pressure cylinders 202; as shown in fig. 6 and 7, each of the positive pressure cylinder 201 and the negative pressure cylinder 202 includes a cylinder sleeve 21 fixed on an outer wall of the casing 1, a cylinder cover 22 fixed on an outer end of the cylinder sleeve 21, a piston 23 capable of reciprocating, and a valve plate 24 disposed between the piston 23 and the cylinder cover 22; ribs for reinforcing the structure and facilitating heat dissipation of the cylinder assembly 2 are arranged on the end face of the outer side of the cylinder cover 22; the piston 23 is arranged in an integral structure and comprises a piston head 231 embedded inside the cylinder sleeve 21 and a connecting rod part 232 extending to the inner end of the machine shell 1, the piston head 231 is provided with a packing cup 28 and a packing cup pressing plate 29, a compression chamber 25 is formed between the piston head 231 and the valve plate 24, and the connecting rod part 232 is used for being connected with a driving mechanism; as shown in fig. 8, a first chamber 26 and a second chamber 27 through which air flows before and after being compressed are formed between the valve plate 24 and the cylinder head 22; the end faces of the valve plate 24 opposite to the first chamber 26 and the second chamber 27 are provided with vent holes 241, the end face of one side of the vent hole 241 opposite to the first chamber 26, which is deviated to the piston 23, and the end face of one side of the vent hole 241 opposite to the second chamber 27, which is deviated to the cylinder cover 22, are provided with valve plates 242 for realizing one-way air flow, and the outer side end of each valve plate 242 is also provided with a reinforcing plate 243 and a valve gasket 244 for preventing the valve plate 242 from being deformed by pressure, and the reinforcing plate 243 and the valve gasket 244 sequentially penetrate through, lock and fix; in this embodiment, the first chamber 26 is used to supply air to the compression chamber 25, and the second chamber 27 is used to compress air and discharge the compressed air from the compression chamber 25.

Second, the driving mechanism 3 (motor, motor shaft and eccentric wheel):

as shown in fig. 3, 4, and 9, the driving mechanism 3 includes a motor 31, a motor shaft 32, and an eccentric wheel 33 mounted on the motor shaft 32; the motor 31 is fixedly arranged below the machine shell 1, the motor shaft 32 extends into the machine shell 1, and bearings are arranged at the assembly positions of the motor shaft and the machine shell 1; the connecting rod portions 232 of the four pistons 23 are all fitted on the eccentric wheel 33 in a rotating manner; the motor 31 drives the motor shaft 32 and the eccentric wheel 33 to rotate, thereby driving the piston 23 to reciprocate in the cylinder liner 21.

Thirdly, the machine shell 1 (base, mounting shell, upper top cover and sealing cover):

as shown in fig. 1, the casing 1 includes a base 11, an installation shell 12, an upper top cover 13 and a sealing cover 14, which are sequentially arranged from bottom to top; the motor 31 is arranged at the lower end of the base 11, and the cylinder component 2 is arranged in the mounting shell 12; as shown in fig. 10 and 11, the mounting case 12 includes a lower chamber 121 and an upper chamber 122 for mounting the cylinder assembly 2; the positive pressure end air inlet 15 and the positive pressure end air outlet 16 are oppositely arranged on the side wall of the upper top cover 13, the negative pressure suction inlet 17 and the negative pressure discharge outlet 18 are oppositely arranged at the lower end part of the side wall of the mounting shell 12 and are communicated with the lower chamber 121; the positive pressure airflow channel 4 is arranged in the upper top cover 13 and the mounting shell 12, the negative pressure airflow channel 5 is arranged in the mounting shell 12 and penetrates through the corresponding cylinder sleeve 21 and the corresponding valve plate 24 respectively, and the communication is realized through the first cavity 26, the compression chamber 25 and the second cavity 27.

Fourthly, the positive pressure gas flow channel 4:

as shown in fig. 12 and 13, the positive pressure gas flow path 4 includes a positive pressure suction collecting flow path 41, a positive pressure suction flow path 42, a positive pressure discharge flow path 43, and a positive pressure discharge collecting flow path 44 in this order in the flow direction; only the internal air flow path when one side positive pressure cylinder 201 is operated is illustrated, and the air flow path inside the other side positive pressure cylinder 201 is the same.

As shown in fig. 14, the positive pressure suction manifold channel 41 is provided between the upper end of the upper lid 13 and the seal lid 14, and communicates with the positive pressure side air inlet 15.

The positive pressure suction flow channels 42 are symmetrically arranged along a vertical plane where the arrangement directions of the pair of negative pressure cylinders 202 are located, and as shown in fig. 13, each positive pressure suction flow channel is composed of a section of vertical path, and the path is formed by sequentially penetrating through the installation shell 12 from the lower end surface of the upper top cover 13, reversing at 90 degrees, penetrating through the cylinder sleeve 21 and the valve plate 24, and realizing communication with the first chamber 26; the flow path in which the positive pressure suction flow path 42 is inside the mounting case 12 is shown by the broken line entering from the upper end with reference to fig. 11.

The positive pressure discharge flow passage 43 and the positive pressure suction flow passage 42 are symmetrically arranged along a vertical plane where the arrangement directions of the pair of positive pressure cylinders 201 are located, as shown in fig. 13, and also consist of a section of vertical path, and the path sequentially penetrates through the valve plate 24, the cylinder sleeve 21, and the mounting shell 12 and the lower end face of the top cover by the second chamber 27 in a 90-degree reversing manner.

As shown in fig. 14, the positive pressure discharge collecting flow path 44 is provided between the upper end of the upper lid 13 and the sealing lid 14, and communicates with the positive pressure side air outlet 16.

In the whole circulation path, as shown in fig. 8, the first chamber 26 is communicated with the second chamber 27 through the vent 241 provided with the valve plate 242; the air in the first chamber 26 enters the compression chamber 25 through the air vent holes 241 (the end near the piston 23 is mounted with the valve sheet 242) in the valve plate 24, is compressed by the movement of the piston 23, and flows into the second chamber 27 through the air vent holes 241 (the end near the cylinder head 22 is mounted with the valve sheet 242) in the valve plate 24.

Fifthly, a negative pressure airflow channel 5:

as shown in fig. 15, the negative pressure airflow passage 5 includes a negative pressure suction confluent flow passage 51, a negative pressure suction flow passage 52, a negative pressure discharge flow passage 53, and a negative pressure discharge confluent flow passage 54; only the internal air flow path of the negative pressure cylinder 202 on one side is shown in the figure, and the air flow path inside the negative pressure cylinder 202 on the other side is the same.

As shown in fig. 10, the negative pressure suction collecting flow passage 51 and the negative pressure discharge collecting flow passage 54 are separately provided and together form a lower chamber 121, the negative pressure suction collecting flow passage 51 communicates with the negative pressure suction port 17, and the negative pressure discharge collecting flow passage 54 communicates with the negative pressure discharge port 18.

As shown in fig. 15, the negative pressure suction flow passage 52 passes through the mounting case 12, the cylinder liner 21, and the valve plate 24 in sequence from the negative pressure suction conflux flow passage 51 to communicate with the first chamber 26; the flow path of the negative pressure suction flow path 52 from the negative pressure suction conflux flow path 51 into the mounting case 12 is shown by a broken line entering from the side in fig. 11.

As shown in fig. 15, the negative pressure discharge flow passage 53 and the negative pressure suction flow passage 52 are symmetrically disposed, and the second chamber 27 sequentially penetrates the valve plate 24, the cylinder liner 21, and the mounting case 12 to communicate with the negative pressure discharge collecting flow passage 54.

In the whole circulation path, as shown in fig. 8, the first chamber 26 is communicated with the second chamber 27 through a vent 241 provided with a valve plate 242; the air in the first chamber 26 enters the compression chamber 25 through the air vent holes 241 (the end near the piston 23 is mounted with the valve sheet 242) in the valve plate 24, is compressed by the movement of the piston 23, and flows into the second chamber 27 through the air vent holes 241 (the end near the cylinder head 22 is mounted with the valve sheet 242) in the valve plate 24.

The invention is mainly applied to pressure swing adsorption oxygen generation in the field of microminiature oxygen generation, compared with the traditional double-cylinder compressor, the invention not only can provide positive pressure (compressed air), but also can output negative pressure (vacuum) to realize the pressurized adsorption of the molecular sieve in the oxygen generator, and completely desorb the nitrogen adsorbed on the molecular sieve through the vacuum, thereby improving the adsorption energy efficiency of the molecular sieve, needing no more compressed air and higher adsorption pressure to compensate, and having small power and low energy consumption of the compressor; meanwhile, the integrated four-cylinder structure is adopted, so that the whole structure design is compact, the space occupancy rate is small, and the vibration in the working process can be reduced by the symmetrical balanced structure.

The above embodiments are merely illustrative of the technical ideas and features of the present invention, and the purpose of the embodiments is to enable those skilled in the art to understand the contents of the present invention and implement the present invention, and not to limit the protection scope of the present invention. It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof, and it is therefore intended that the present embodiments be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.