Four-cylinder compressor

Abstract

The utility model discloses a four-cylinder compressor which comprises a main body frame, a rotation driving mechanism and a cylinder mechanism, the top of the main body frame is provided with a first flow path used for guiding gas into compression chambers of two positive pressure cylinders and a second flow path used for guiding the gas out of the compression chambers of the two positive pressure cylinders; the bottom of the main body frame is provided with a third flow path used for guiding gas into compression chambers of the two negative pressure air cylinders and a fourth flow path used for guiding the gas out of the compression chambers of the two negative pressure air cylinders. The first flow path and the second flow path extend on the same plane, the third flow path and the fourth flow path extend on the same plane, and the extending plane of the first flow path and the extending plane of the second flow path are parallel to the extending plane of the third flow path and the extending plane of the fourth flow path. According to the utility model, the flow path structure can be conveniently processed, the processing difficulty is reduced, and the processing cost is saved; the gas flows in the flow path more smoothly and stably, and the circulation efficiency of the gas in the flow path can be effectively improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to a compressor technical field especially four cylinder compressors. BACKGROUND

[0002] The compressor is an important component of the oxygen generator, and the oxygen generator uses the compressor to compress air and separates nitrogen and oxygen in the air through the adsorption performance of the molecular sieve to obtain high-concentration oxygen. At present, most of the oxygen generators on the market use two-cylinder compressors or four-cylinder compressors. When a four-cylinder compressor is used, one pair of cylinders is used to extract external air for compression and to deliver compressed air to the molecular sieve, and the other pair of cylinders is used to extract adsorbed nitrogen from the molecular sieve and to discharge it externally. The four-cylinder compressor sets up internal flow paths as air extraction and nitrogen extraction channels.

[0003] The invention patent document with the authorized announcement number CN103814214B discloses a reciprocating pump and an oxygen concentration device, which includes four cylinders intersecting with the axial direction of the motor, and eight flow paths are arranged, including four air suction flow paths and four air discharge flow paths. The eight flow paths are arranged in pairs and are located between the cylinders adjacent to the motor shaft. The two flow paths arranged between the cylinders adjacent to the motor shaft are arranged in the axial direction of the motor shaft. The technical scheme of the invention uses eight flow paths, and the arrangement of the flow paths involves multiple directions. The overall flow path structure is in the form of L-shaped arrangement involving both horizontal and vertical structures, which makes the internal structure complex and is not conducive to improving the stability of gas flow. Moreover, the formation of the flow paths involves a large number of blind hole machining, which further increases the processing difficulty. UTILITY MODEL CONTENT

[0004] The utility model solves the technical problem of providing a four-cylinder compressor with a simple gas flow path structure and easy processing.

[0005] The utility model provides to adopt the technical scheme that four cylinder compressors, including main body frame, rotation drive mechanism and cylinder mechanism, the cylinder mechanism includes four and is arranged in the four -around main body frame of 90 DEG distribution gas cylinder unit, four gas cylinder units include a pair of opposite setting positive pressure cylinder and another pair of opposite setting negative pressure cylinder, and the piston assembly is formed in the gas cylinder unit and is movably arranged compression chamber, and the rotation drive mechanism is connected with the piston assembly of each gas cylinder unit through the eccentric wheel setting in the main body frame, and the rotation drive mechanism drives eccentric wheel eccentric rotation to drive each piston assembly reciprocating motion in the compression chamber, the top of main body frame is equipped with the first flow path for guiding the gas into the compression chamber of two positive pressure cylinders, and the second flow path for guiding the gas from the compression chamber of two positive pressure cylinders, the bottom of main body frame is equipped with the third flow path for guiding the gas into the compression chamber of two negative pressure cylinders, and the fourth flow path for guiding the gas from the compression chamber of two negative pressure cylinders, the first flow path and the second flow path extend on the same plane, the third flow path and the fourth flow path extend on the same plane, and the extension plane of the first flow path and the second flow path is parallel to the extension plane of the third flow path and the fourth flow path.

[0006] As an improvement of the above scheme: the first flow path, the second flow path, the third flow path and the fourth flow path all extend in the direction perpendicular to the rotation axis of the eccentric wheel. The utility model further limits the arrangement form of the four flow paths, so that the extension directions of the four flow paths are all perpendicular to the rotation axis of the eccentric wheel. The extension directions of the first flow path and the second flow path in the upper layer and the third flow path and the fourth flow path in the lower layer are all parallel to the compression direction of the gas cylinder unit. The flow path of the gas in the four flow paths has a higher degree of adaptation with the compression path of the gas cylinder unit. The gas flowing in each flow path will not be affected by the air resistance caused by the bending and undulating of the flow path structure, and the flow efficiency of the gas in each flow path can be further improved.

[0007] As the improvement of the above scheme: the first flow path and the second flow path are communicated through the compression chamber of the positive pressure cylinder; the third flow path and the fourth flow path are communicated through the compression chamber of the negative pressure cylinder. The utility model discloses through the first flow path and the second flow path for sucking air are directly communicated through the compression chamber of the positive pressure cylinder, and the third flow path and the fourth flow path for discharging nitrogen are directly communicated through the compression chamber of the negative pressure cylinder, and other transfer structures are not arranged to communicate between the positive pressure flow path and the negative pressure flow path, can further simplify the overall structure of flow path, further improve the flow efficiency of gas in flow path. The utility model discloses through the above structural improvement, realize the mutual independence between the air suction air path from the air inlet to the air outlet formed by the first flow path and the second flow path and the nitrogen discharge flow path from the air inlet to the air outlet formed by the third flow path and the fourth flow path, facilitate subsequent operation according to the demand amount of air and the discharge efficiency of nitrogen to adjust the compression frequency of the positive pressure cylinder and the negative pressure cylinder.

[0008] As the improvement of the above scheme: the first flow path and the second flow path are communicated through the compression chamber of the positive pressure cylinder; the third flow path and the fourth flow path are communicated through the compression chamber of the negative pressure cylinder. The utility model discloses through the first flow path and the second flow path for sucking air are directly communicated through the compression chamber of the positive pressure cylinder, and the third flow path and the fourth flow path for discharging nitrogen are directly communicated through the compression chamber of the negative pressure cylinder, and other transfer structures are not arranged to communicate between the positive pressure flow path and the negative pressure flow path, can further simplify the overall structure of flow path, further improve the flow efficiency of gas in flow path. The utility model discloses through the above structural improvement, realize the mutual independence between the air suction air path from the air inlet to the air outlet formed by the first flow path and the second flow path and the nitrogen discharge flow path from the air inlet to the air outlet formed by the third flow path and the fourth flow path, facilitate subsequent operation according to the demand amount of air and the discharge efficiency of nitrogen to adjust the compression frequency of the positive pressure cylinder and the negative pressure cylinder.

[0009] As the improvement of the above scheme: the top of the main frame is detachably connected with the upper pressing frame cover and the cover plate to form an upper chamber, and the upper chamber is partitioned to form a first air inlet chamber and a first air outlet chamber; the positive pressure air inlet and the positive pressure air outlet are oppositely arranged on the upper pressing frame cover, the compression chambers of the two positive pressure cylinders are communicated with the positive pressure air inlet through the first air inlet chamber to form a first flow path, and the compression chambers of the two positive pressure cylinders are communicated with the positive pressure air outlet through the first air outlet chamber to form a second flow path. The upper chamber is formed on the top of the main frame by arranging the upper pressing frame cover and the cover plate, the top of the main frame can be sealed by the upper pressing frame cover, and the upper chamber is formed on the top of the main frame and is independent of the internal structure of the main frame. Meanwhile, the upper pressing frame cover and the main frame are detachably connected, so that the top structure of the main frame can be easily opened to disassemble and assemble the eccentric wheel arranged in the main frame, and the assembly efficiency of the internal structure of the main frame is improved. The upper chamber formed between the upper pressing frame cover and the cover plate is divided into two independent air chambers by the partition rib to form the first flow path and the second flow path, respectively. Under the compression work of the positive pressure cylinder, the low-pressure air flows into the first flow path, and the high-pressure air is discharged from the second flow path. The low-pressure air flowing in the first flow path and the high-pressure air flowing in the second flow path can be isolated by the partitioned first air inlet chamber and the first air outlet chamber. The utilization rate of the space between the upper pressing frame cover and the cover plate is improved by simultaneously integrating the upper chamber formed by the upper pressing frame cover and the cover plate, the volume of the air flow switching chamber in the air suction flow path is reduced, and the volume of the entire compressor is reduced.

[0010] As the improvement of the above scheme: the bottom of the main frame is detachably connected with the lower base to form a lower chamber, and the lower chamber is partitioned to form a second air inlet chamber and a second air outlet chamber; the negative pressure air inlet and the negative pressure air outlet are oppositely arranged on the main frame, the compression chambers of the two negative pressure cylinders are communicated with the negative pressure air inlet through the second air inlet chamber to form a third flow path, and the compression chambers of the two negative pressure cylinders are communicated with the negative pressure air outlet through the second air outlet chamber to form a fourth flow path. The lower chamber is formed between the lower base and the bottom of the main frame, the lower base can be used as a relay connecting part between the main frame and the rotating drive mechanism to facilitate the connection and fixation of the main frame and the rotating drive mechanism. The lower chamber formed between the lower base and the main frame is divided into two independent air chambers by the partition rib to form the third flow path and the fourth flow path, respectively. Under the compression work of the negative pressure cylinder, the low-pressure nitrogen gas flows into the third flow path, and the high-pressure nitrogen gas is discharged from the fourth flow path. The low-pressure nitrogen gas flowing in the third flow path and the high-pressure nitrogen gas flowing in the fourth flow path can be isolated by the partitioned second air inlet chamber and the second air outlet chamber. The utilization rate of the space between the lower base and the main frame is improved, the volume of the air flow switching chamber in the nitrogen discharge flow path is reduced, and the volume of the entire compressor is reduced.

[0011] As the improvement of the above scheme: the cylinder unit comprises a cylinder sleeve, a cylinder sleeve pressing plate, a cylinder sleeve cover plate and a swing arm; one end of the swing arm is rotatably connected with the eccentric wheel through a swing arm bearing, and the other end of the swing arm is fixedly connected with the piston assembly; the cylinder sleeve is fixed on the main body frame and fixedly connected with the cylinder sleeve pressing plate to form a compression chamber, and the cylinder sleeve cover plate is fixedly connected with the cylinder sleeve pressing plate and forms a gas cavity outside the cylinder sleeve pressing plate, which is communicated with the compression chamber. The swing arm bearing is arranged to connect the swing arm with the eccentric wheel, and the cylinder sleeve is matched with the cylinder sleeve pressing plate and the cylinder sleeve cover plate to form the compression chamber and the gas cavity communicated with the compression chamber, and the swing arm of the four cylinder units is driven to reciprocate by the eccentric rotation of the eccentric wheel to realize the piston movement of the piston assembly in the cylinder sleeve, so that the gas flow between the compression chamber and the gas cavity is realized by the suction and compression of the gas in the compression chamber, and power is provided for the gas flow in each flow path.

[0012] As the improvement of the above scheme: the cylinder sleeve cover plate is provided with a separation rib on the side facing the cylinder sleeve pressing plate to divide the gas cavity into an intake gas cavity and an exhaust gas cavity, and the cylinder sleeve pressing plate is provided with a first intake hole, a first exhaust hole, a second intake hole and a second exhaust hole; the intake gas cavity is communicated with the corresponding gas inlet flow path through the first intake hole, and communicated with the compression chamber through the first exhaust hole; the exhaust gas cavity is communicated with the compression chamber through the second intake hole, and communicated with the corresponding gas outlet flow path through the second exhaust hole. The separation rib is arranged on the cylinder sleeve cover plate and matched with the cylinder sleeve pressing plate to form the gas cavities communicated with the two flow paths respectively, and the structure of the cylinder unit is reasonably utilized, the separation rib can be used to divide the space between the cylinder sleeve cover plate and the cylinder sleeve pressing plate and also used as a reinforcing rib to improve the strength of the cylinder sleeve cover plate; after the intake gas cavity and the exhaust gas cavity are formed by the separation rib, the low-pressure gas enters the compression chamber through the intake gas cavity under the suction of the cylinder unit, and the low-pressure gas is compressed to form high-pressure gas which is then discharged through the exhaust gas cavity under the compression of the cylinder unit, and the separation rib realizes the separation of the low-pressure gas and the high-pressure gas to ensure the smooth compression process of the gas; the intake hole and the exhaust hole are arranged on the cylinder sleeve pressing plate to guide the gas flow in the gas path, so as to realize the switching flow of the low-pressure gas and the high-pressure gas in the two gas paths. The first intake hole for realizing the entry of the low-pressure gas and the second exhaust hole for realizing the discharge of the high-pressure gas are integrated on the cylinder sleeve pressing plate, so that the separate pipeline for realizing the introduction of the low-pressure gas into the intake gas cavity and the discharge of the high-pressure gas from the exhaust gas cavity is not needed, and the integration degree of the overall structure is higher, which is conducive to further reducing the overall structure of the compressor.

[0013] As the improvement of the above scheme: the cylinder sleeve is provided with two gas path channels respectively connected with the first air inlet hole and the second air outlet hole, and the two gas path channels are respectively connected to the gas inlet flow path and the gas outlet flow path; the gas path channels extend axially on the cylinder sleeve, and the gas path channels on the two oppositely arranged cylinder units correspond to each other and are axially aligned. The utility model discloses a gas path channel is arranged on the cylinder sleeve as a relay channel of the flow path, which can ensure the linear extension of the flow path.

[0014] As the improvement of the above scheme: the first air outlet hole is provided with a first one-way valve, and the first one-way valve opens from the direction of the air inlet cavity to the compression chamber; the second air inlet hole is provided with a second one-way valve, and the second one-way valve opens from the direction of the compression chamber to the air outlet cavity. The utility model discloses a one-way valve is arranged to limit the flow direction of the gas in the flow path, so that the low-pressure gas can only flow from the air inlet cavity to the compression chamber, and the high-pressure gas can only flow from the compression chamber to the air outlet cavity. The first one-way valve and the second one-way valve can be used to realize the differential control of the gas flow speed, which facilitates the rapid inflow of the low-pressure gas in the compression chamber and the rapid intake, compression and outlet process of the high-pressure gas. During the movement of the piston assembly of the cylinder unit to compress the gas in the compression chamber, the high-pressure gas in the air outlet cavity can be prevented from being sucked into the compression chamber, and the high-pressure gas can be prevented from being compressed into the air inlet cavity, so that the gas can flow smoothly from the air inlet to the air outlet, and the normal compression process of the gas can be ensured.

[0015] As the improvement of the above scheme: the piston assembly comprises a swing arm connecting portion, a leather cup and a leather cup pressing plate; the swing arm connecting portion is fixedly connected with the swing arm, and the swing arm connecting portion is fixedly connected with the leather cup pressing plate and clamps the leather cup between the swing arm connecting portion and the leather cup pressing plate; and the piston assembly forms a sealing fit with the compression chamber through the leather cup.

[0016] As the improvement of the above scheme: the utility model also comprises a buffer piece fixed on the leather cup pressing plate, and the setting position of the buffer piece corresponds to the setting position of the first one-way valve. In the utility model, the first one-way valve is arranged to limit the flow direction of the gas. When the gas flows from the air inlet cavity to the compression chamber, the first one-way valve opens towards the compression chamber, which is easy to collide with the piston assembly during the intake stage, which not only produces noise, but also easily damages the first one-way valve and the piston assembly. Therefore, the utility model sets a buffer piece to buffer the action of the first one-way valve, which can reduce the force during the opening process of the first one-way valve and effectively reduce the noise generated.

[0017] As the improvement of the above scheme: the buffer piece is a silica gel sheet, which is embedded and fixed on the leather cup pressing plate. In the utility model, the buffer piece can be made of materials with elasticity such as foam, sponge, rubber and silica gel, and the silica gel sheet is used as the preferred scheme.

[0018] As the improvement of the above scheme: the rotating drive mechanism comprises a motor and a rotating shaft, one end of the rotating shaft is fixedly connected with the output end of the motor, the other end of the rotating shaft penetrates through the main body frame and forms a circumferential limiting cooperation with an eccentric wheel arranged in the main body frame, and the rotating shaft is rotatably matched with the main body frame. In the utility model, the mature and low-cost motor is used as the driving device, and stable output power can be provided for the rotation of the eccentric wheel.

[0019] As the improvement of the above scheme: the lower base is fixedly connected with the motor, and the lower base and the upper pressing frame cover are rotatably matched with the rotating shaft. According to the utility model, the bottom structure and the top structure of the main body frame are connected together through the rotating shaft at the same time when the motor and the rotating shaft output rotating power, so that the assembly of the lower base at the bottom of the main body frame and the upper pressing frame cover at the top of the main body frame can be well positioned.

[0020] As the improvement of the above scheme: the lower base is fixedly connected with the motor, and the lower base and the upper pressing frame cover are rotatably matched with the rotating shaft. According to the utility model, the bottom structure and the top structure of the main body frame are connected together through the rotating shaft at the same time when the motor and the rotating shaft output rotating power, so that the assembly of the lower base at the bottom of the main body frame and the upper pressing frame cover at the top of the main body frame can be well positioned.

[0021] The utility model discloses an improved compressor for an oxygen generator, which reduces the number of gas flow paths in the compressor structure for realizing air suction and nitrogen discharge, optimizes the arrangement of each flow path, and arranges the two flow paths for air suction and the two flow paths for nitrogen discharge in a single direction, thereby avoiding the arrangement of flow paths in multiple directions and simplifying the structures involved in the composition of flow paths. This not only facilitates the processing of flow path structures, reduces processing difficulty, and saves processing costs, but also makes gas flow more smoothly and stably in the flow path, effectively improving the flow efficiency of gas in the flow path. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is a structural explosion diagram of the utility model;

[0023] Figure 2 It is a structural section view of the utility model;

[0024] Figure 3 It is a top view of the internal structure of the utility model;

[0025] Figure 4 It is a composition structure schematic view of the first flow path and the second flow path in the utility model;

[0026] Figure 5 It is a composition structure schematic view of the third flow path and the fourth flow path in the utility model;

[0027] Figure 6 The utility model discloses a structure explosion map of the cylinder unit.

[0028] Marked in the drawing: 100 - main body frame, 110 - positive pressure air inlet, 120 - positive pressure air outlet, 130 - negative pressure air inlet, 140 - negative pressure air outlet, 150 - upper pressure frame cover, 160 - cover plate, 170 - lower base, 200 - cylinder unit, 201 - positive pressure cylinder, 202 - negative pressure cylinder, 210 - piston assembly, 211 - swing arm connecting part, 212 - leather bowl, 213 - leather bowl pressing plate, 214 - buffer, 220 - cylinder sleeve, 221 - gas path channel, 230 - cylinder sleeve pressing plate, 231 - first air inlet hole, 232 - first air outlet hole, 233 - second air inlet hole, 234 - second air outlet hole, 240 - cylinder sleeve cover plate, 241 - partition rib, 250 - swing arm, 251 - swing arm bearing, 300 - eccentric wheel, 410 - first flow path, 420 - second flow path, 430 - third flow path, 440 - fourth flow path, 510 - motor, 520 - rotating shaft, 530 - lower bearing, 540 - lower fixed sleeve, 550 - upper bearing, 560 - upper fixed sleeve. DETAILED DESCRIPTION

[0029] In order to facilitate understanding of the utility model, the utility model is further described below in combination with the drawings.

[0030] In the description of the utility model, it is to be explained that the terms "front", "back", "left", "right", "up", "down", "inner" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of description, and are not indicative or suggestive of the devices or components indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore can not be understood as limiting the utility model.

[0031] As Figures 1 to 5 shown, the four-cylinder compressor disclosed by the utility model is composed of a main body frame 100, a rotating drive mechanism and a cylinder mechanism. The main body frame 100 is the basic mounting piece of the entire four-cylinder compressor, and the rotating drive mechanism and the cylinder mechanism are both mounted on the main body frame 100. The rotating drive mechanism is the driving mechanism of the compression work, and the rotating drive mechanism drives the piston assembly 210 in the cylinder unit 200 to reciprocate in the cylinder unit 200 by eccentric rotation of the eccentric wheel 300, so as to realize the compression of the gas in the compression chamber of the cylinder unit 200. The cylinder mechanism realizes the suction and compression of the gas through the four cylinder units 200, so as to realize the suction and discharge of the nitrogen in the molecular sieve in the compressor and the suction of the external air.

[0032] Specifically, as Figure 1 , Figures 3 to 5As shown, the cylinder mechanism in the utility model is composed of four cylinder units 200, the four cylinder units 200 are oppositely arranged in pairs, and the four cylinder units are arranged at the four sides of the main frame 100 with a 90° distribution; wherein two oppositely arranged cylinder units 200 are positive pressure cylinders 201, and the other two oppositely arranged cylinder units 200 are negative pressure cylinders 202; the positive pressure cylinder 201 is used for extracting external air for compression and conveying compressed air to the molecular sieve of the oxygen generator, and the negative pressure cylinder 202 is used for extracting the nitrogen gas adsorbed by the molecular sieve in the oxygen generator and discharging to the outside. The structure and working principle of the four cylinder units 200 are the same, the movable piston assembly 210 is arranged in the cylinder unit 200 to form a compression chamber, and the rotating driving mechanism drives the piston assembly 210 in each cylinder unit 200 to reciprocate through the eccentric wheel 300. In order to simplify the internal structure and improve the stability of gas flow, the flow paths corresponding to the positive pressure cylinder 201 and the negative pressure cylinder 202 are improved in the utility model, four flow paths are arranged in the utility model, which are respectively a first flow path 410 for guiding gas into the compression chamber of the two positive pressure cylinders 201, a second flow path 420 for guiding gas out of the compression chamber of the two positive pressure cylinders 201, a third flow path 430 for guiding gas into the compression chamber of the two negative pressure cylinders 202, and a fourth flow path 440 for guiding gas out of the compression chamber of the two negative pressure cylinders 202; that is, the first flow path 410 and the third flow path 430 are the gas inlet flow paths for guiding gas into the compression chamber, and the second flow path 420 and the fourth flow path 440 are the gas outlet flow paths for guiding gas out of the compression chamber. The first flow path 410 and the second flow path 420 are communicated through the compression chamber of the positive pressure cylinder 201, and the third flow path 430 and the fourth flow path 440 are communicated through the compression chamber of the negative pressure cylinder 202. The first flow path 410 is a gas flow path for extracting external air, the positive pressure cylinder 201 works to suck external air into the first flow path 410, so that the external air flows into the compression chamber of the two positive pressure cylinders 201 through the first flow path 410, and then the air enters the second flow path 420 through the compression work of the two positive pressure cylinders 201, and then is conveyed to the molecular sieve of the oxygen generator through the second flow path 420. The third flow path is a gas flow path for extracting the nitrogen gas adsorbed by the molecular sieve, the negative pressure cylinder 202 works to suck the nitrogen gas adsorbed by the molecular sieve into the third flow path 430, so that the nitrogen gas flows into the compression chamber of the two negative pressure cylinders 202 through the third flow path 430, and then the nitrogen gas enters the fourth flow path 440 through the compression work of the two negative pressure cylinders 202, and then is discharged to the outside of the compressor through the fourth flow path 440.

[0033] As Figures 3 to 5As shown, the two positive pressure cylinders 201 arranged oppositely in the utility model alternately compress air, when one of the positive pressure cylinders 201 adsorbs low-pressure air in the first flow path 410, the other positive pressure cylinder 201 compresses the low-pressure air having been sucked into the compression chamber, and after the low-pressure air is compressed into high-pressure air, the high-pressure air is discharged through the second flow path 420, thereby continuously supplying high-pressure air to the molecular sieve through the alternate operation of the two positive pressure cylinders 201. Similarly, the two negative pressure cylinders 202 arranged oppositely in the utility model alternately compress nitrogen, when one of the negative pressure cylinders 202 adsorbs low-pressure nitrogen in the third flow path 430, the other negative pressure cylinder 202 compresses the low-pressure nitrogen having been sucked into the compression chamber, and after the low-pressure nitrogen is compressed into high-pressure nitrogen, the high-pressure nitrogen is discharged through the fourth flow path 440, thereby continuously discharging the nitrogen adsorbed by the molecular sieve through the alternate operation of the two negative pressure cylinders 202.

[0034] The four-cylinder compressor disclosed in the utility model is used in an oxygen generator and combines the working mode of two molecular sieves alternately generating oxygen in the oxygen generator, continuously supplies high-pressure air to the molecular sieve currently in the working state through the alternate operation of the two positive pressure cylinders 201, and sucks out the nitrogen in the molecular sieve currently not in the working state through the alternate operation of the two negative pressure cylinders 202. The first flow path 410 is a flow path for low-pressure air inflow, the second flow path 420 is a flow path for high-pressure air to be supplied to the molecular sieve, the third flow path 430 is a flow path for nitrogen in the molecular sieve to flow in, and the fourth flow path 440 is a flow path for high-pressure nitrogen to be discharged, thereby realizing the air inflow and nitrogen discharge of the two molecular sieves in the oxygen generator under the alternate working state, and ensuring that the molecular sieve of the oxygen generator continuously performs efficient oxygen generation work.

[0035] Further, as Figure 4 and Figure 5As shown, the utility model also optimizes the arrangement form of four flow paths, makes the first flow path 410 and the second flow path 420 extend on the same plane, the third flow path 430 and the fourth flow path 440 extend on the same plane, and makes the extension plane of the first flow path 410 and the second flow path 420 be parallel to the extension plane of the third flow path 430 and the fourth flow path 440, so as to take the rotation axis of the rotary drive mechanism as the longitudinal reference, then the first flow path 410 and the second flow path 420 are arranged on one transverse plane, the third flow path 430 and the fourth flow path 440 are arranged on another transverse plane, which is equivalent to that the first flow path 410, the second flow path 420, the third flow path 430 and the fourth flow path 440 all extend in the direction perpendicular to the rotation axis of the eccentric wheel 300; the extension plane formed by the first flow path 410 and the second flow path 420 and the extension plane formed by the third flow path 430 and the fourth flow path 440 are arranged in layers on the main frame 100. Through the arrangement of the above flow path structure, the four flow paths in the utility model all extend transversely relative to the rotation axis of the rotary drive mechanism, and there is no flow path structure in the longitudinal direction, so that vertical drilling is not needed during processing, thereby effectively simplifying the flow path structure, reducing the processing difficulty and processing cost of the flow path; and since the flow path structure is relatively simple, the flow path of the gas in each flow path is basically linear flow, so that the gas flow in each flow path is more smooth, and the stability of the gas flow is better.

[0036] As shown in Figure 4 and Figure 5 In the utility model, four gas ports are arranged to realize the gas exchange between the flow path and the external air and the molecular sieve of the oxygen generator. The four gas ports are the positive pressure air inlet 110 and the positive pressure air outlet 120 arranged at the top of the main frame 100, and the negative pressure air inlet 130 and the negative pressure air outlet 140 arranged at the bottom of the main frame 100. The compression chambers of the two positive pressure cylinders 201 are communicated with the positive pressure air inlet 110 to form the first flow path 410, and the compression chambers of the two positive pressure cylinders 201 are communicated with the positive pressure air outlet 120 to form the second flow path 420; the external air enters the first flow path 410 through the positive pressure air inlet 110, and then is discharged to the molecular sieve of the oxygen generator through the positive pressure air outlet 120 after flowing through the second flow path 420. The compression chambers of the two negative pressure cylinders 202 are communicated with the negative pressure air inlet 130 to form the third flow path 430, and the compression chambers of the two negative pressure cylinders 202 are communicated with the negative pressure air outlet 140 to form the fourth flow path 440; the nitrogen gas adsorbed by the molecular sieve enters the third flow path 430 through the negative pressure air inlet 130, and then is discharged to the outside of the oxygen generator through the negative pressure air outlet 140 after flowing through the fourth flow path 440.

[0037] Specifically, as shown in Figure 1 , Figure 2 and Figure 4As shown, the utility model discloses upper pressure frame cover 150 and cover plate 160 are arranged on the top of main frame 100 to form upper chamber on the top of main frame 100.Upper pressure frame cover 150 is detachably connected on the top of main frame 100 through fastener, and cover plate 160 is detachably connected with upper pressure frame cover 150 through fastener, and the space between upper pressure frame cover 150 and cover plate 160 is upper chamber, and upper chamber is used to constitute first flow path 410 and second flow path 420.The space between upper pressure frame cover 150 and cover plate 160 is cut off into first air inlet chamber and first air outlet chamber two independent cavities by setting partition structure on upper pressure frame cover 150, and first air inlet chamber and first air outlet chamber are communicated with the compression chamber of two positive pressure cylinders 201.The upper chamber formed between upper pressure frame cover 150 and cover plate 160 is separated from the internal space of main frame 100, and the internal space of main frame 100 does not participate in the circulation of gas, so that positive pressure air inlet 110 and positive pressure air outlet 120 are arranged on the two sides of upper pressure frame cover 150, positive pressure air inlet 110 and positive pressure air outlet 120 are oppositely arranged, positive pressure air inlet 110 is communicated with first air inlet chamber, and positive pressure air outlet 120 is communicated with first air outlet chamber.In the utility model, the assembly problem of eccentric wheel 300 in main frame 100 is considered, and the top of main frame 100 is provided with opening, so as to facilitate the assembly of eccentric wheel 300 through the top opening of main frame 100, then the top opening of main frame 100 is closed through the setting of upper pressure frame cover 150, upper pressure frame cover 150 is connected on the top of main frame 100, and the space for accommodating eccentric wheel 300 is formed in main frame 100;Upper pressure frame cover 150 can also cooperate with cover plate 160 to form upper chamber as a receiving member, as a part of first flow path 410 and second flow path 420, effectively improve the utilization of space, and simplify the top component structure of main frame 100.

[0038] Specifically, as Figure 1 、 Figure 2 and Figure 5As shown, the utility model discloses lower base 170 is arranged at the bottom of main frame 100 to form lower chamber at the bottom of main frame 100.Lower base 170 is detachably connected at the bottom of main frame 100 through fastener, and the space between lower base 170 and main frame 100 is lower chamber, and lower chamber is used to constitute third flow path 430 and fourth flow path 440.The space between lower base 170 and main frame 100 is cut off as second air inlet chamber and second air outlet chamber two independent cavities by setting partition structure on lower base 170, and second air inlet chamber and second air outlet chamber are communicated with the compression chamber of two negative pressure cylinders 202.Because eccentric wheel 300 is assembled from the top opening of main frame 100, therefore the bottom of main frame 100 can be provided with the bottom plate of integrated structure to constitute lower chamber with lower base 170, therefore negative pressure air inlet 130 and negative pressure air outlet 140 can be arranged at the bottom of main frame 100, and negative pressure air inlet 130 and negative pressure air outlet 140 are arranged at the two sides of the bottom of main frame 100 respectively, negative pressure air inlet 130 and negative pressure air outlet 140 are oppositely arranged, negative pressure air inlet 130 is communicated with second air inlet chamber, and negative pressure air outlet 140 is communicated with second air outlet chamber.Lower base 170 is the relay connecting component between main frame 100 and rotary drive mechanism, can realize the connection between main frame 100 and rotary drive mechanism, and can cooperate with main frame 100 to form lower chamber, as the component part of third flow path 430 and fourth flow path 440, effectively improve the utilization of space, and simplify the bottom component structure of main frame 100.

[0039] As Figures 1 to 6As shown, the cylinder unit 200 in the utility model further comprises a cylinder sleeve 220, a cylinder sleeve pressing plate 230, a cylinder sleeve cover plate 240 and a swing arm 250 in addition to the piston assembly 210. The cylinder sleeve 220 is a circular ring structure with a certain width, one end of the cylinder sleeve 220 is fixedly connected to the main body frame 100, and the other end of the cylinder sleeve 220 is fixedly connected to the cylinder sleeve pressing plate 230, so that a compression chamber for axial reciprocating movement of the piston assembly 210 is formed inside the cylinder sleeve 220. The cylinder sleeve cover plate 240 is fixedly connected to the cylinder sleeve pressing plate 230 to form an air cavity outside the cylinder sleeve pressing plate 230, the air cavity is communicated with the compression chamber to realize the communication between the air inlet flow path and the air outlet flow path. The piston assembly 210 is connected to the eccentric wheel 300 through the swing arm 250; specifically, the piston assembly 210 is composed of a swing arm connecting part 211, a leather cup 212 and a leather cup pressing plate 213, one end of the swing arm connecting part 211 is fixedly connected to the swing arm 250, the other end of the swing arm 250 is rotatably connected to the eccentric wheel 300 through a swing arm bearing 251, the swing arm connecting part 211 is fixedly connected to the leather cup pressing plate 213 and clamps the leather cup 212 between the swing arm connecting part 211 and the leather cup pressing plate 213, and the piston assembly 210 is sealingly matched with the compression chamber through the leather cup 212. The eccentric wheel 300 rotates under the driving of the rotary driving mechanism, and due to the eccentric rotating feature of the eccentric wheel 300, the piston assembly 210 of the four cylinder units 200 is reciprocated in the corresponding compression chamber to realize the extraction and compression of the gas.

[0040] In order to realize the gas flow between the air inlet flow path and the air outlet flow path, Figure 4 and Figure 5As shown, the utility model discloses the inside surface of cylinder cover plate 240, i.e. the one side of cylinder cover plate 240 towards cylinder pressing plate 230 is provided with partition rib 241, and the air cavity that is formed by cylinder cover plate 240 and cylinder pressing plate 230 is divided into intake air cavity and exhaust air cavity by partition rib, and four through holes are provided on cylinder pressing plate 230 as the flow hole of gas, and are respectively first intake hole 231, first exhaust hole 232, second intake hole 233 and second exhaust hole 234, the intake air cavity is communicated with the corresponding gas inlet flow path of guiding gas through first intake hole 231, and the intake air cavity is communicated with the compression chamber through first exhaust hole 232, the exhaust air cavity is communicated with the compression chamber through second intake hole 233, and the exhaust air cavity is communicated with the corresponding gas outlet flow path of guiding gas through second exhaust hole 234, i.e. the intake air cavity of two positive pressure cylinders 201 is communicated into first flow path 410 through the first intake hole 231 on the corresponding cylinder pressing plate 230 and is communicated with the corresponding compression chamber through first exhaust hole 232, and the exhaust air cavity of two positive pressure cylinders 201 is communicated with the corresponding compression chamber through the second intake hole 233 on the corresponding cylinder pressing plate 230 and is communicated into second flow path 420 through second exhaust hole 234, i.e. the intake air cavity of two negative pressure cylinders 202 is communicated into third flow path 430 through the first intake hole 231 on the corresponding cylinder pressing plate 230 and is communicated with the corresponding compression chamber through first exhaust hole 232, and the exhaust air cavity of two negative pressure cylinders 202 is communicated with the corresponding compression chamber through the second intake hole 233 on the corresponding cylinder pressing plate 230 and is communicated into fourth flow path 440 through second exhaust hole 234.

[0041] In addition, as Figure 4 And Figure 5 As shown, the utility model discloses the gas flow between the chamber on main frame 100 and the air cavity that is formed by cylinder cover plate 240 and cylinder pressing plate 230 is realized through the setting of gas path channel 221. Two gas path channels 221 are fixedly arranged on the outer circumferential surface of cylinder 220, and the two gas path channels 221 are arranged along the axial direction of cylinder 220, and two gas path channels 221 are arranged on each of four cylinder units 200, i.e. a total of eight gas path channels 221 are arranged, and the gas path channel 221 on the two cylinder units 200 that are oppositely arranged corresponds and axially aligns one to one, and the two gas path channels 221 in the same cylinder unit 200 are communicated with the first intake hole 231 and the second exhaust hole 234 on the corresponding cylinder pressing plate 230 respectively and are communicated with the corresponding chamber on main frame 100. As Figure 4As shown, taking one of the positive pressure cylinders 201 as an example, the positive pressure air inlet 110, the first air cavity, the air passage 221, the first air hole 231 and the air inlet cavity are sequentially communicated to form a first flow path 410, the air outlet cavity, the second air hole 234, the air passage 221, the first air cavity and the positive pressure air outlet 120 are sequentially communicated to form a second flow path 420, and the first flow path 410 and the second flow path 420 are communicated through the first air hole 232, the compression chamber and the second air hole 233. Figure 5 As shown, taking one of the negative pressure cylinders 202 as an example, the negative pressure air inlet 130, the second air cavity, the air passage 221, the first air hole 231 and the air inlet cavity are sequentially communicated to form a third flow path 430, the air outlet cavity, the second air hole 234, the air passage 221, the second air cavity and the negative pressure air outlet 140 are sequentially communicated to form a fourth flow path 440, and the third flow path 430 and the fourth flow path 440 are communicated through the first air hole 232, the compression chamber and the second air hole 233.

[0042] Further, in order to ensure the one-way flow of the air flow in the corresponding flow path and avoid backflow of the air flow in the flow path, the utility model sets a first one-way valve in the first air hole 232 and limits the first one-way valve to open in the direction from the air inlet cavity to the compression chamber, sets a second one-way valve in the second air hole 233 and limits the second one-way valve to open in the direction from the compression chamber to the air outlet cavity. Since the piston assembly 210 reciprocates in the compression chamber, the air flow from the air inlet cavity to the compression chamber will flush the first one-way valve, so that the valve plate of the first one-way valve opens in the direction of the compression chamber, at which time it is easy to collide with the moving piston assembly 210 and produce noise. In order to reduce the noise, as shown, Figure 6 The utility model sets a buffer 214 on the piston assembly 210 skin bowl pressing plate 213, the setting position of the buffer 214 corresponds to the setting position of the first one-way valve, the buffer 214 is made of a material with good elasticity, and a silica gel sheet is preferably used, which is embedded and fixed on the skin bowl pressing plate 213. When the valve plate of the first one-way valve opens, it contacts the buffer 214, which can buffer and reduce the noise of the valve plate of the first one-way valve, thereby suppressing the generation of noise. Since the second one-way valve opens in the direction of the air outlet cavity, it will not collide with the piston assembly 210, so it does not need to be configured with a buffer.

[0043] As shown, Figure 1 And Figure 2As shown, the rotation driving mechanism is composed of the motor 510 and the rotation shaft 520, one end of the rotation shaft 520 is fixedly connected with the output end of the motor 510, the other end of the rotation shaft 520 penetrates the main body frame 100 and is eccentrically connected with the eccentric wheel 300 arranged in the main body frame 100. The connection between the rotation shaft 520 and the eccentric wheel 300 can be realized by the circumferential limiting and matching mode, as long as the relative rotation between the rotation shaft 520 and the eccentric wheel 300 does not occur. The rotation shaft 520 and the main body frame 100 can relatively rotate, specifically, the main body frame 100 is fixedly connected with the motor 510 through the lower base 170, the lower bearing 530 is fixedly arranged on the main body frame 100, the lower bearing 530 forms the rotation cooperation with the rotation shaft 520 through the lower fixed sleeve 540 sleeved on the rotation shaft 520; the upper bearing 550 is fixedly arranged on the upper pressing frame cover 150, the upper bearing 550 forms the rotation cooperation with the rotation shaft 520 through the upper fixed sleeve 560 sleeved on the rotation shaft 520.

Claims

1. A four-cylinder compressor, comprising a main frame (100), a rotational drive mechanism, and a cylinder mechanism. The cylinder mechanism includes four cylinder units (200) arranged at 90° around the main frame (100). The four cylinder units (200) include a pair of positive-pressure cylinders (201) arranged oppositely and another pair of negative-pressure cylinders (202) arranged oppositely. A piston assembly (210) is movably arranged in the cylinder unit (200) to form a compression chamber. The rotational drive mechanism is connected to the piston assemblies (210) of each cylinder unit (200) through an eccentric wheel (300) arranged in the main frame (100). The rotational drive mechanism drives the eccentric wheel (300) to rotate eccentrically to drive each piston assembly (210) to reciprocate in the compression chamber. It is characterized in that: The top of the main frame (100) is provided with a first flow path (410) for guiding gas into the compression chambers of the two positive pressure cylinders (201), and a second flow path (420) for guiding gas out of the compression chambers of the two positive pressure cylinders (201); the bottom of the main frame (100) is provided with a third flow path (430) for guiding gas into the compression chambers of the two negative pressure cylinders (202), and a fourth flow path (440) for guiding gas out of the compression chambers of the two negative pressure cylinders (202); the first flow path (410) and the second flow path (420) extend in the same plane, the third flow path (430) and the fourth flow path (440) extend in the same plane, and the extension plane of the first flow path (410) and the second flow path (420) is parallel to the extension plane of the third flow path (430) and the fourth flow path (440).

2. The four cylinder compressor of claim 1, wherein: The first flow path (410), the second flow path (420), the third flow path (430) and the fourth flow path (440) all extend in a direction perpendicular to the rotation axis of the eccentric wheel (300).

3. The four cylinder compressor of claim 1 wherein: The first flow path (410) and the second flow path (420) communicate through the compression chambers of the positive pressure cylinders (201); the third flow path (430) and the fourth flow path (440) communicate through the compression chambers of the negative pressure cylinders (202).

4. The four cylinder compressor of claim 3 wherein: The top of the main frame (100) is provided with a positive pressure gas inlet (110) and a positive pressure gas outlet (120), and the bottom of the main frame (100) is provided with a negative pressure gas inlet (130) and a negative pressure gas outlet (140); the compression chambers of the two positive pressure cylinders (201) communicate with the positive pressure gas inlet (110) to form the first flow path (410), and communicate with the positive pressure gas outlet (120) to form the second flow path (420); the compression chambers of the two negative pressure cylinders (202) communicate with the negative pressure gas inlet (130) to form the third flow path (430), and communicate with the negative pressure gas outlet (140) to form the fourth flow path (440).

5. The four cylinder compressor of claim 4 wherein: The top of the main frame (100) is detachably connected by an upper pressing frame cover (150) and a cover plate (160) to form an upper chamber, and the upper chamber is partitioned to form a first gas inlet chamber and a first gas outlet chamber; the positive pressure gas inlet (110) and the positive pressure gas outlet (120) are oppositely arranged on the upper pressing frame cover (150), the compression chambers of the two positive pressure cylinders (201) communicate with the positive pressure gas inlet (110) through the first gas inlet chamber to form the first flow path (410), and the compression chambers of the two positive pressure cylinders (201) communicate with the positive pressure gas outlet (120) through the first gas outlet chamber to form the second flow path (420).

6. The four cylinder compressor of claim 5 wherein: The bottom of the main frame (100) is detachably connected with a lower base (170) to form a lower chamber, and the lower chamber is partitioned to form a second air inlet chamber and a second air outlet chamber; a negative pressure air inlet (130) and a negative pressure air outlet (140) are oppositely arranged on the main frame (100), the compression chambers of the two negative pressure cylinders (202) are communicated with the negative pressure air inlet (130) through the second air inlet chamber to form a third flow path (430), and the compression chambers of the two negative pressure cylinders (202) are communicated with the negative pressure air outlet (140) through the second air outlet chamber to form a fourth flow path (440).

7. The four cylinder compressor of claim 1 wherein: The cylinder unit (200) further comprises a cylinder sleeve (220), a cylinder sleeve pressing plate (230), a cylinder sleeve cover plate (240) and a swing arm (250); one end of the swing arm (250) is rotatably connected with the eccentric wheel (300) through a swing arm bearing (251), and the other end of the swing arm (250) is fixedly connected with the piston assembly (210); the cylinder sleeve (220) is fixed on the main frame (100) and fixedly connected with the cylinder sleeve pressing plate (230) to form a compression chamber, and the cylinder sleeve cover plate (240) is fixedly connected with the cylinder sleeve pressing plate (230) and forms an air chamber located outside the cylinder sleeve pressing plate (230), which is communicated with the compression chamber.

8. The four cylinder compressor of claim 7, wherein: The cylinder sleeve cover plate (240) is provided with a partition rib (241) on the side facing the cylinder sleeve pressing plate (230) to partition the air chamber into an air inlet chamber and an air outlet chamber, and the cylinder sleeve pressing plate (230) is provided with a first air inlet hole (231), a first air outlet hole (232), a second air inlet hole (233) and a second air outlet hole (234); the air inlet chamber is communicated with the corresponding gas inlet flow path through the first air inlet hole (231), and the air inlet chamber is communicated with the compression chamber through the first air outlet hole (232); the air outlet chamber is communicated with the compression chamber through the second air inlet hole (233), and the air outlet chamber is communicated with the corresponding gas outlet flow path through the second air outlet hole (234).

9. The four cylinder compressor of claim 8 wherein: The cylinder sleeve (220) is provided with two gas path channels (221) communicated with the first air inlet hole (231) and the second air outlet hole (234) respectively, and the two gas path channels (221) are communicated into the gas inlet flow path and the gas outlet flow path respectively; the gas path channels (221) extend axially on the cylinder sleeve (220), and the gas path channels (221) on the two cylinder units (200) arranged oppositely correspond to each other and are axially aligned.

10. The four cylinder compressor of claim 8, wherein: A first one-way valve is arranged in the first air outlet hole (232) and opens in the direction from the air inlet chamber to the compression chamber; and a second one-way valve is arranged in the second air inlet hole (233) and opens in the direction from the compression chamber to the air outlet chamber.

11. The four cylinder compressor of claim 7 wherein: The piston assembly (210) comprises a swing arm connecting part (211), a leather cup (212) and a leather cup pressing plate (213); the swing arm connecting part (211) is fixedly connected with the swing arm (250), the swing arm connecting part (211) is fixedly connected with the leather cup pressing plate (213) and clamps the leather cup (212) between the swing arm connecting part (211) and the leather cup pressing plate (213), and the piston assembly (210) is sealingly matched with the compression chamber through the leather cup (212).

12. The four cylinder compressor of claim 11 wherein: The buffer (214) fixed on the leather cup pressing plate (213) is further included, and the setting position of the buffer (214) corresponds to the setting position of the first one-way valve.

13. The four cylinder compressor of claim 12, wherein: The buffer (214) is a silica gel sheet, which is embeddedly fixed on the leather cup pressing plate (213).

14. The four cylinder compressor of claim 6 wherein: The rotating drive mechanism comprises a motor (510) and a rotating shaft (520), one end of the rotating shaft (520) is fixedly connected with the output end of the motor (510), the other end of the rotating shaft (520) penetrates through the main body frame (100) and forms a circumferential limiting fit with the eccentric wheel (300) arranged in the main body frame (100), and the rotating shaft (520) is rotatably matched with the main body frame (100).

15. The four cylinder compressor of claim 14, wherein: The lower base (170) is fixedly connected with the motor (510), and the lower base (170) and the upper pressing frame cover (150) are rotatably matched with the rotating shaft (520).

16. The four cylinder compressor of claim 15, wherein: The main body frame (100) is fixedly provided with a lower bearing (530), the lower bearing (530) forms a rotating fit with the rotating shaft (520) through a lower fixed sleeve (540) sleeved on the rotating shaft (520); and the upper pressing frame cover (150) is fixedly provided with an upper bearing (550), the upper bearing (550) forms a rotating fit with the rotating shaft (520) through an upper fixed sleeve (560) sleeved on the rotating shaft (520).

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