Air inlet and outlet valve for oxygen generator

Abstract

The application discloses an air inlet and outlet valve for an oxygen generator, which comprises a fixed valve plate and a movable valve plate, the end face of the fixed valve plate facing the movable valve plate is a fixed end face, the end face of the movable valve plate facing the fixed valve plate is a movable end face, the fixed end face and the movable end face are in contact and sealed, the movable end face is further provided with oxygen conveying grooves which are always in communication with oxygen guide grooves, the oxygen conveying grooves are sequentially communicated with oxygen guide holes when the movable valve plate moves, the oxygen conveying grooves are provided with two, one of the oxygen conveying grooves is simultaneously communicated with an air guide groove and a molecular tower when the movable valve plate moves, the molecular tower realizes air inlet and oxygen outlet, the other oxygen conveying groove is simultaneously communicated with a nitrogen outlet groove and another molecular tower, the other molecular tower realizes nitrogen outlet and oxygen back flushing, and the air inlet and outlet valve for the oxygen generator has the advantages of simple structure, good sealing effect, complete nitrogen analysis, high oxygen production capacity and efficiency and long service life.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of oxygen generator, more particularly relates to an air inlet and outlet valve for oxygen generator. BACKGROUND

[0002] Oxygen generators are widely used in clinical oxygen supply or home oxygen supply for patients. After development, molecular sieve separation oxygen generator has become the mainstream. It uses the characteristics of molecular sieve pressurized adsorption and decompression desorption to separate medical oxygen from air under low pressure conditions. This method can quickly produce oxygen on site under normal temperature and pressure conditions, is safe and reliable, has small equipment volume, fast oxygen production, high oxygen production concentration and low cost.

[0003] The six-tower adsorption rotary valve with patent application number 202110402595.3 is a product developed by the applicant earlier. It realizes air, oxygen and nitrogen gas guiding by setting air guiding grooves and air guiding holes on the outer circumferential side of the cylindrical diaphragm. In production, it is found that this rotation has very high requirements for processing precision and sealing, and has very great production difficulty and cost. In use, it is found that its service life is low, and it is prone to leakage and gas mixing problems, affecting normal use. In addition, the six-tower adsorption rotary valve in the foregoing analyzes nitrogen. As the nitrogen is discharged, the pressure in the molecular tower decreases, affecting the normal discharge of nitrogen, making the nitrogen analysis incomplete, affecting subsequent oxygen production, and reducing the continuous oxygen production capacity and efficiency of the molecular sieve. SUMMARY

[0004] The purpose of the present application is to provide an air inlet and outlet valve for oxygen generator, to solve the defects of the molecular sieve rotary valve in the prior art, and to provide an air inlet and outlet valve for oxygen generator with simple structure, good sealing effect, complete nitrogen analysis, high oxygen production capacity and efficiency, and long service life.

[0005] The technical scheme of the present application is an air inlet and outlet valve for oxygen generator, which is connected to an air conveyor and a molecular sieve. The molecular sieve includes at least two molecular towers, a fixed valve plate and a movable valve plate. The end face of the fixed valve plate facing the movable valve plate is a fixed end face, and the end face of the movable valve plate facing the fixed valve plate is a movable end face. The fixed end face and the movable end face are in contact and sealed.

[0006] The fixed end face is provided with an air guiding groove in communication with the air conveyor, a plurality of air guiding holes in communication with the air port of the molecular sieve, a plurality of oxygen guiding holes in communication with the oxygen port of the molecular sieve, and an oxygen guiding groove in communication with the oxygen-consuming equipment.

[0007] The moving end face is provided with air conveying grooves which are always in communication with the air guide grooves and sequentially communicate with the air guide holes as the moving valve plate moves; the moving end face is also provided with nitrogen discharging grooves which sequentially communicate with the air guide holes as the moving valve plate moves; the moving end face is also provided with oxygen conveying grooves which are always in communication with the oxygen guide grooves; the oxygen conveying grooves sequentially communicate with the oxygen guide holes as the moving valve plate moves;

[0008] The oxygen conveying grooves are provided with two; one of the oxygen conveying grooves is simultaneously in communication with the air guide grooves and a molecule tower as the moving valve plate moves, and the molecule tower realizes air intake and oxygen discharge; the other oxygen conveying groove is simultaneously in communication with the nitrogen discharging groove and another molecule tower as the moving valve plate moves, and the molecule tower realizes nitrogen discharge and oxygen back blowing.

[0009] Preferably, the oxygen conveying grooves include long grooves and circular holes provided on the moving end face, the circular holes are always in communication with the oxygen guide grooves; the long grooves sequentially communicate with the oxygen guide holes as the moving valve plate moves; the moving valve plate is internally provided with guide grooves which communicate with the long grooves and the circular holes.

[0010] Preferably, the fixed valve plate is provided with air inlets which are always in communication with the air guide grooves, oxygen outlets which are always in communication with the oxygen guide grooves, air outlets which are adapted to the number of the air guide holes, and oxygen inlets which are adapted to the number of the oxygen guide holes, the air outlets and the air guide holes are one-to-one in communication, and the oxygen inlets and the oxygen guide holes are one-to-one in communication; the air outlets are connected with the air inlets of the molecule sieve, and the oxygen inlets are connected with the oxygen inlets of the molecule sieve.

[0011] Preferably, the fixed valve plate and the moving valve plate are both cylindrical, the moving valve plate is connected with a rotating shaft, and the moving valve plate rotates around the rotating shaft axis under the driving of the rotating shaft;

[0012] The air guide grooves and the oxygen guide grooves are both annular and coaxial with the rotating shaft; the air guide holes and the oxygen guide holes are both annular and uniformly arranged around the rotating shaft as the center;

[0013] The two oxygen conveying grooves are symmetrically arranged along the rotating shaft axis; the arc length between the two oxygen conveying grooves is an integer multiple of the arc length between the adjacent two oxygen guide holes; the arc length between the air conveying groove and the nitrogen discharging groove is adapted to the arc length between the two oxygen conveying grooves; along the radial direction of the moving end face, the air conveying groove and the nitrogen discharging groove are respectively arranged on the inner side of the two oxygen conveying grooves, the air conveying groove and the oxygen conveying groove on the outer side thereof are simultaneously in communication with the same molecule tower, and the nitrogen discharging groove and the oxygen conveying groove on the outer side thereof are simultaneously in communication with another molecule tower.

[0014] Preferably, the rotating shaft is connected at the position of the valve axis of the movable valve plate, the air guide holes are uniformly arranged on the outer side of the air guide groove, the oxygen guide holes are uniformly arranged on the outer side of the air guide groove, and the lines connecting adjacent air guide holes and oxygen guide holes pass through the center of the air guide groove; the line connecting the air conveying groove and the rotating shaft coincides with the line connecting the oxygen conveying groove and the rotating shaft.

[0015] Preferably, the width of the air conveying groove in the radial direction of the rotating shaft is greater than the distance between the inner side of the air guide groove and the outer side of the air guide hole; the width of the long groove of the oxygen conveying groove and the air conveying groove in the rotating direction of the movable valve plate is adapted and greater than the width of the oxygen guide hole.

[0016] Preferably, a square hole is arranged at the center position of the movable valve plate, an avoiding hole is arranged on the fixed valve plate along the air guide groove axis position, one end of the rotating shaft passes through the avoiding hole and is inserted into the square hole to be connected with the movable valve plate; the other end of the rotating shaft is connected with a driving motor.

[0017] Preferably, a valve body is arranged outside the movable valve plate, a cylindrical cavity with an inner diameter adapted to the outer diameter of the movable valve plate is arranged in the valve body, an outer end face of the movable valve plate away from the fixed valve plate is an outer end face, a guide column is fixed on the outer end face, a spiral spring is arranged outside the guide column, the spiral spring presses the movable valve plate against the fixed valve plate, so that the movable end face and the fixed end face are sealed; a plurality of limiting grooves are arranged on the outer circumferential surface of the movable valve plate along the axis direction, and an arc-shaped snap spring is arranged in the limiting groove.

[0018] Preferably, a nitrogen channel communicating the nitrogen discharging groove and the cylindrical cavity is arranged in the movable valve plate, and a nitrogen outlet communicating the cylindrical cavity is arranged on the valve body.

[0019] Preferably, the air guide holes are 2+2N (N is a positive integer), a plurality of gas pressure equalizing holes are further arranged on the movable end face, the gas pressure equalizing holes are communicated two by two, the gas pressure equalizing holes are sequentially communicated with the oxygen guide holes with the movement of the movable valve plate, the sum of the number of the gas pressure equalizing holes and the number of the two oxygen conveying grooves is adapted to the number of the oxygen guide holes, and the number of the oxygen guide holes is adapted to the number of the molecular towers in the molecular sieve.

[0020] The technical scheme of the application has the following beneficial effects:

[0021] 1. The valve only has one fixed valve plate and one movable valve plate, and only one pair of end faces in contact with each other and sealed, so that the structure is simple, the machining precision is low, the end face sealing effect is good, the problems of sealing failure and gas leakage are not easy to occur, the normal oxygen production work of the oxygen generator is ensured, and the service life is long.

[0022] 2, the valve passes through two oxygen carrying groove design, and the combination of oxygen carrying groove and nitrogen exhaust groove, effectively realized in the molecular sieve molecular tower analysis nitrogen when the appropriate oxygen back flushing, so that the molecular tower nitrogen exhaust thoroughly, ensure the activity of molecular tower, prolong the service life of molecular tower, avoid the molecular tower into the air side to retain a large amount of nitrogen, increase the effective air intake, improve the oxygen capacity of molecular sieve. BRIEF DESCRIPTION OF DRAWINGS

[0023] Figure 1 It is a structure schematic diagram of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application.

[0024] Figure 2 It is a sectional view of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application.

[0025] Figure 3 It is a structure schematic diagram of the moving valve plate and the fixed valve plate of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application.

[0026] Figure 4 It is another perspective structure schematic diagram of the moving valve plate and the fixed valve plate of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application.

[0027] Figure 5 It is a simplified diagram of the internal structure of the moving valve plate of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application, wherein only an air guide hole, an oxygen guide hole, an air outlet and an oxygen inlet are simplified.

[0028] Figure 6 It is a simplified diagram of the internal structure of the fixed valve plate of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application, wherein only an oxygen carrying groove and two air pressure equalizing holes are simplified.

[0029] Figure 7 It is a fixed end surface schematic diagram of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application.

[0030] Figure 8 It is a fixed end surface schematic diagram of the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application. DETAILED DESCRIPTION

[0031] In order to facilitate those skilled in the art to understand the technical scheme of the present application, the technical scheme of the present application will be further described in combination with specific embodiments and the drawings of the specification.

[0032] As shown in Figure 2 and Figure 3 , the air inlet and outlet valve for the oxygen generator of the technical scheme of the present application, connecting the air conveyor (generally air compressor) and the molecular sieve, the molecular sieve at least includes two molecular towers, and double tower molecular sieve or six tower molecular sieve, including a fixed valve plate 100 and a moving valve plate 200. As shown inFigure 2 As shown, the fixed valve plate 100 is installed through the valve plate mounting plate 402, and the movable valve plate 200 is in sealing contact with the fixed valve plate 100. The fixed valve plate 200 is mainly formed by the first valve plate 204 and the second valve plate 205 fixed together by screws, which is mainly for facilitating the machining of the air pressure equalization hole 61 and the oxygen carrying groove 33 on the fixed valve plate 200.

[0033] As shown in the drawings, Figure 2 and Figure 3 The technical scheme of the present application is an air inlet and outlet valve for an oxygen generator, which is connected to an air conveyor (generally an air compressor) and a molecular sieve, the molecular sieve at least including two molecular towers, and a double-tower molecular sieve or a six-tower molecular sieve, including a fixed valve plate 100 and a movable valve plate 200. The end surface of the fixed valve plate 100 facing the movable valve plate 200 is a fixed end surface 101, and the end surface of the movable valve plate 200 facing the fixed valve plate 100 is a movable end surface 201, and the fixed end surface 101 and the movable end surface 201 are in contact and sealed.

[0034] Based on the above technical scheme, the air inlet and outlet valve only has a fixed valve plate and a movable valve plate, and only has a fixed end surface and a movable end surface, and the fixed end surface and the movable end surface are sealed, i.e. only has a pair of sealing end surfaces. Compared with the prior art, the valve structure is simple, easy to process, and easy to ensure the processing precision during processing, ensuring the sealing of the fixed end surface and the movable end surface, the end surface sealing effect is good, and the problems of sealing failure or gas leakage are not easy to occur, ensuring the normal oxygen production work of the oxygen generator and long service life.

[0035] In the technical scheme, as shown in the drawings, Figure 2 , Figure 4 It is very Figure 5 As shown, the fixed end surface 101 is provided with an air guide groove 12 in communication with the air conveyor, a plurality of air guide holes 22 in communication with the air port of the molecular sieve, a plurality of oxygen guide holes 32 in communication with the oxygen port of the molecular sieve, and an oxygen guide groove 42 in communication with the oxygen-consuming equipment. The movable end surface 201 is provided with an air carrying groove 13 that is always in communication with the air guide groove 12, and the air carrying groove 13 is sequentially connected to each air guide hole 22 as the movable valve plate 200 moves. The movable end surface 201 is also provided with a nitrogen discharge groove 51, which is sequentially connected to the air guide holes 22 as the movable valve plate 200 moves. The movable end surface 201 is also provided with an oxygen carrying groove 33 that is always in communication with the oxygen guide groove 42. The oxygen carrying groove 33 is sequentially connected to each oxygen guide hole 32 as the movable valve plate 200 moves.

[0036] Based on the above technical scheme, the air conveyor (compressor) delivers air into the air guide groove 12 on the fixed end face 101 of the fixed valve plate 100, and the air in the air guide groove 12 enters the air carrying groove 13 on the moving end face 201. With the movement of the follower valve plate 200, the air carrying groove 13 is in contact with and conducts each air guide hole 22 in turn, and the air enters the molecular sieve through the air guide hole 22 to produce oxygen. Oxygen is obtained by molecular sieve separation, and each oxygen guide hole 32 in communication with the molecular sieve oxygen port obtains oxygen in turn. With the movement of the follower valve plate 200, the oxygen carrying groove 33 on the moving end face obtains oxygen from the oxygen guide hole 32 position in turn, and the oxygen carrying groove 33 is always in communication with the oxygen guide groove 42 on the fixed end face. The oxygen guide groove 42 delivers oxygen to the oxygen-consuming equipment (breathing machine or direct oxygen inhalation, etc.).

[0037] Based on the above technical scheme, the air guide hole 22 and the oxygen guide hole 32 are provided with a plurality of air guide holes 22 and oxygen guide holes 32, which are generally suitable for the number of molecular towers in the oxygen generator. The plurality of air guide holes 22 and oxygen guide holes 32 increase the number of molecular towers, increase the oxygen production efficiency and oxygen production capacity of the oxygen generator, and prolong the activity of the molecular tower.

[0038] In the technical scheme, as shown in Figure 6 , the oxygen carrying groove 33 is provided with two; with the movement of the follower valve plate 200, one of the oxygen carrying grooves 33 is in communication with one molecular tower at the same time as the air guide groove 12, and the molecular tower realizes air inlet and oxygen exhaust; the other oxygen carrying groove 33 is in communication with the nitrogen exhaust groove 51 at the same time as the other molecular tower, and the molecular tower realizes nitrogen exhaust and oxygen back flushing. That is, as shown in Figure 6As shown in the figure, one of the oxygen carrying grooves 33 (marked as oxygen carrying groove a) obtains oxygen from the oxygen guide hole 32 of the fixed end face, part of the oxygen is discharged through the oxygen guide groove 42 connected with the oxygen carrying groove 33 (oxygen carrying groove a) for oxygen-consuming equipment, and the other part of the oxygen reversely enters another oxygen carrying groove (marked as oxygen carrying groove b) connected with the oxygen guide groove 42. The oxygen in the oxygen carrying groove (oxygen carrying groove b) reversely enters the oxygen guide hole 32 connected with the oxygen carrying groove (oxygen carrying groove b), and then reversely enters the molecular tower connected with the oxygen guide hole 32 through the oxygen guide hole 32, so as to input a certain amount of oxygen to the oxygen side of the molecular tower, and at the same time, the air side of the molecular tower is connected with the nitrogen discharge groove 51 through the air guide hole 22 to discharge nitrogen. In this way, the molecular tower is supplemented with oxygen on the oxygen side, the oxygen reversely passes through the molecular tower, the air pressure on the air side of the molecular tower is increased, and the complete discharge of nitrogen is ensured. That is, the valve effectively realizes the appropriate oxygen back flushing when the molecular sieve in the molecular tower discharges nitrogen, so that the molecular tower discharges nitrogen completely, ensures the activity of the molecular tower, prolongs the service life of the molecular tower, avoids the storage of a large amount of nitrogen in the air side of the molecular tower, increases the effective air intake, and improves the oxygen production capacity of the molecular sieve.

[0039] In the technical solution, as shown in the figure, Figure 6 The oxygen carrying groove 33 includes a long groove 331 and a circular hole 332 arranged on the moving end face 201, and the circular hole 332 is always connected with the oxygen guide groove 42. The long groove 331 moves with the moving valve plate 200 and is connected with each oxygen guide hole 32 in turn. The moving valve plate 200 is internally provided with a guide groove 333 connected with the long groove 331 and the circular hole 332.

[0040] Based on the above technical solution, the oxygen output from the molecular tower enters the long groove 331 of the oxygen carrying groove 33 through the oxygen guide hole 32, and then is discharged from the circular hole 332 through the guide groove 333 and enters the oxygen guide groove 42. Here, the long groove 331 and the circular hole 332 are connected in a separated manner through the structure of the oxygen carrying groove 33 and the setting of the guide groove 333, which facilitates the oxygen guide and transportation, ensures that the oxygen output from the molecular tower can smoothly enter the circular hole 332 and the oxygen guide groove 42 after passing through the long groove 331, and avoids the problem of reverse flow of oxygen when the molecular tower outputs oxygen.

[0041] In the technical solution, as shown in the figure, Figure 5As shown, the fixed valve plate 100 is provided with an air inlet 11 always in communication with the air guide groove 12, an oxygen outlet 41 always in communication with the oxygen guide groove 42, an air outlet 21 corresponding to the number of air guide holes 22, and an oxygen inlet 31 corresponding to the number of oxygen guide holes 32. The air outlet 21 and the air guide hole 22 are in one-to-one correspondence, and the oxygen inlet 31 and the oxygen guide hole 32 are in one-to-one correspondence. The air outlet 21 is connected with the molecular sieve air port, and the oxygen inlet 31 is connected with the molecular sieve oxygen port.

[0042] Based on the above technical solution, the air conveying device (compressor) conveys air to the air inlet 11, the air inlet 11 conveys air to the air guide groove 12, then the air is conveyed to the air guide hole 22 through the air conveying groove 13, then enters the air outlet 21 position, the air in the air outlet 21 position is input into the molecular tower, the oxygen separated by the molecular tower is conveyed to the oxygen inlet 31 through the molecular oxygen oxygen port, then enters the oxygen guide hole 32 position, and the oxygen in the oxygen guide hole 32 enters the oxygen conveying groove 33 on the fixed end surface 201, and is conveyed to the oxygen guide groove 42 through the oxygen conveying groove 33, and finally is discharged through the oxygen outlet 41 in communication with the oxygen guide groove 42.

[0043] Based on the above technical solution, the air inlet and outlet valve is integrated with the structure of the molecular sieve on the fixed valve plate 100, which is convenient for processing, installation and arrangement, convenient for pipeline connection and arrangement, and can reduce the overall volume of the oxygen generator, so that the failure rate of the oxygen generator in operation is low.

[0044] In the technical solution, as shown in the drawings, Figure 2 The fixed valve plate 100 and the movable valve plate 200 are both cylindrical, the movable valve plate 200 is connected with a rotating shaft 203, and the movable valve plate 200 rotates around the axis of the rotating shaft 203 under the driving of the rotating shaft 203. As shown in the drawings, Figure 7 The air guide groove 12 and the oxygen guide groove 42 are both annular and coaxial with the rotating shaft 203. The air guide hole 22 and the oxygen guide hole 32 are both annular and arranged uniformly with the rotating shaft 203 as the center. As shown in the drawings, Figure 8 The two oxygen conveying grooves 33 are symmetrically arranged along the axis of the rotating shaft 203. The arc length between the two oxygen conveying grooves 33 is an integer multiple of the arc length between the adjacent two oxygen guide holes 32. The arc length between the air conveying groove 13 and the nitrogen discharge groove 51 is adapted to the arc length between the two oxygen conveying grooves 33. Along the radial direction of the movable end surface, the air conveying groove 13 and the nitrogen discharge groove 51 are arranged inside the two oxygen conveying grooves 33, the air conveying groove 13 and the oxygen conveying groove 33 outside thereof are simultaneously in communication with the same molecular tower, and the nitrogen discharge groove 51 and the oxygen conveying groove 33 outside thereof are simultaneously in communication with another molecular tower.

[0045] Based on the above technical solution, it is effectively ensured that after the rotating shaft 203 drives the valve plate to rotate a certain angle each time, the oxygen transport tank 13 contacts an air guide hole 2. At the same time, the oxygen guide hole 32 connected to the molecular tower connected to the air guide hole 22 contacts one of the oxygen transport tanks 33, so that the molecular tower can enter air and discharge oxygen, and perform oxygen production operation. At this time, the other oxygen transport tank 33 is connected to the oxygen guide hole 32 connected to another molecular tower, and the air guide hole connected to the molecular tower is connected to the nitrogen removal tank 51. The molecular tower performs nitrogen removal operation, and oxygen backflushing is performed during nitrogen removal to ensure thorough nitrogen removal.

[0046] Based on the above technical solution, the oxygen transport tank 33 is connected through the rotating shaft 203. In this technical solution, the molecular sieve is a six-tower molecular sieve with six molecular towers. The two oxygen transport tanks 33 are symmetrically arranged on the moving end face, which facilitates the setting of the pressure equalization hole and ensures the pressure equalization of the oxygen side in each molecular tower waiting to release oxygen and nitrogen.

[0047] In this technical solution, such as Figure 8 As shown, the rotating shaft 203 is connected to the axis of the moving valve plate 200. Figure 7 As shown, air vents 22 are evenly distributed on the outside of air vent groove 12, and oxygen vents 32 are evenly distributed on the outside of air vent groove 12. The line connecting adjacent air vents 22 and oxygen vents 32 passes through the center of air vent groove 12. Figure 8 As shown, the line connecting the air transport tank 13 and the rotating shaft 203 coincides with the line connecting the oxygen transport tank 33 and the rotating shaft 203.

[0048] Based on the above technical solution, the rotating shaft 203 is set at the axis of the moving valve plate 200, which simplifies the structural design of the moving valve plate 200. The air guide groove 12 is set coaxially with the fixed valve plate, which ensures that the connection between each air guide hole and each air guide groove is smooth and reliable during the rotation of the moving valve plate, and ensures that air, oxygen and nitrogen flow according to the predetermined design path, avoiding cross-contamination problems.

[0049] like Figure 7 The image shown is an embodiment of a fixed valve plate. Figure 8 The image shown is an embodiment of the moving valve plate. Figure 7 Central valve plate and Figure 8 Corresponding to the intermediate valve plate, Figure 7 On the fixed end face, the line connecting the adjacent oxygen guide hole 32 and air guide hole 22 passes through the center of the air guide groove 12. Figure 8In the middle, the two long grooves 331 between the connection and oxygen transport groove 13 and the nitrogen discharge groove 51 between the connection coincide, facilitating the positioning and processing of each oxygen guide hole 32 and air guide hole 22 on the fixed end face, and ensuring the dimensional accuracy and positional accuracy during processing. Facilitate the positioning and processing of oxygen transport groove 13 and nitrogen discharge groove 51 on the moving end face, ensure the dimensional accuracy and positional accuracy during processing.

[0050] In the technical solution, as shown in Figure 8 The width of the air transport groove 13 in the radial direction of the shaft 203 is greater than the distance between the inner side of the air guide groove 12 and the outer side of the air guide hole 22, which ensures that the air transport groove 13 communicates the air guide groove 12 and the air guide hole 22. The long groove 331 of the oxygen transport groove 33 and the air transport groove 13 are adapted in width in the rotation direction of the moving valve plate 200 and are greater than the width of the oxygen guide hole 32. Increasing the width of the long groove 331 and the air transport groove 13 in the rotation direction, and prolonging the time of the air transport groove 13 to transport air into the molecular tower, prolonging the time of the molecular tower to transport oxygen into the long groove 331, prolonging the effective oxygen production time during the rotation of the fixed end face, and improving the oxygen production efficiency of the oxygen generator.

[0051] In the technical solution, as shown in Figure 2 The center of the moving valve plate 200 is provided with a square hole 202, and the fixed valve plate 100 is provided with an avoiding hole 102 along the axis of the air guide groove 12. One end of the shaft 203 passes through the avoiding hole 102 and is inserted into the square hole 202 to connect with the moving valve plate 200, realizing the rotation of the moving valve plate. The other end of the shaft 203 is connected with the driving motor 400. The driving motor 400 is installed through the motor mounting plate 401, and the motor mounting plate 401 is installed with the valve plate mounting plate 402, and the installation of the valve is realized. The avoiding hole 102 is set to avoid the interference between the shaft and the fixed valve plate.

[0052] In the technical solution, as shown in Figure 2 The valve body 300 is provided outside the moving valve plate 200, and the cylindrical cavity 301 with an inner diameter adapted to the outer diameter of the moving valve plate 200 is arranged inside the valve body 300. The end face of the moving valve plate 200 away from the fixed valve plate 100 is an outer end face, and a guide column 208 is fixedly arranged on the outer end face. The guide column 208 is sleeved with a spiral spring 302, which presses the moving valve plate 200 to the fixed valve plate 100, so that the moving end face 201 and the fixed end face 101 are sealed. A plurality of limiting grooves 206 are arranged on the outer circumferential surface of the moving valve plate 200 along the axis direction, and an arc-shaped snap spring 207 is arranged in the limiting groove 206.

[0053] Based on the above technical scheme, the setting of the spiral spring 302 realizes the installation of the moving valve plate, pushes the moving valve plate to the fixed valve plate, ensures the sealing of the moving end face and the fixed end face, and also avoids the over-tight contact between the moving end face and the fixed end face, causing excessive wear of the moving end face and the fixed end face. The setting of the arc-shaped snap spring 207 realizes the installation, contact and limiting of the moving valve plate in the valve body 300, and reduces the contact and friction between the moving valve plate and the inner side surface of the cylindrical cavity 301.

[0054] In the technical scheme, the nitrogen gas passage 52 is arranged in the moving valve plate 200 and communicates with the nitrogen discharge groove 51 and the cylindrical cavity 301, and the nitrogen gas outlet 53 is arranged on the valve body 300 and communicates with the cylindrical cavity 301, so as to realize the discharge of nitrogen gas.

[0055] In the technical scheme, as shown in Figure 6 and Figure 8 , the air guide holes are 2+2N (N is a positive integer). Generally, the air guide holes 22 are 4 or 6, and preferably 6, that is, the molecular sieve using the air inlet and outlet valve is a 6-tower molecular sieve. A plurality of gas pressure equalization holes 61 are further arranged on the moving end face 201, and the gas pressure equalization holes are communicated in pairs. With the movement of the moving valve plate 200, the gas pressure equalization holes 61 are sequentially communicated with the oxygen guide holes 32. The number of the gas pressure equalization holes 61 and the two oxygen conveying grooves 33 is adapted to the number of the oxygen guide holes 32, and the number of the oxygen guide holes is adapted to the number of the molecular towers in the molecular sieve. In the molecular sieve, two molecular towers work at the same time, one performs oxygen production, and the other performs nitrogen discharge, and the remaining molecular towers are temporarily in a waiting state. At this time, the molecular towers in the waiting state have part of air remaining therein, and continue to produce oxygen under the pressure difference between the air port and the oxygen port. The oxygen remains on the oxygen side of the molecular tower, so that the oxygen side gas pressure increases. Therefore, a gas pressure equalization hole is arranged on the front side and the rear side of the oxygen conveying groove 33 in the rotating direction of the moving end face, and the two gas pressure equalization holes are communicated, so as to realize pressure equalization for the molecular tower connected with the two gas pressure equalization holes, and avoid excessive pressure in one of the molecular towers. The molecular tower connected with the gas pressure equalization hole on the rear side of the oxygen conveying groove 33 has just discharged oxygen, and the oxygen side gas pressure is low. The molecular tower connected with the gas pressure equalization hole on the front side of the oxygen conveying groove 33 is about to discharge oxygen, and the oxygen side gas pressure is high. The two gas pressure equalization holes are communicated to realize pressure equalization, so as to avoid the backflow of oxygen on the oxygen side of the molecular tower connected with the gas pressure equalization hole on the front side of the oxygen conveying groove 33 to the air side, ensure the continuous oxygen production of the molecular tower, and improve the oxygen production efficiency.

[0056] In the technical scheme, a six-tower molecular sieve is used, four gas pressure equalization holes 61 are arranged, and one gas pressure equalization hole 61 is arranged on the front side and the rear side of the two oxygen conveying grooves 33. Of course, if a two-tower molecular sieve is used, the two molecular sieves perform oxygen discharge and nitrogen discharge in turn, and the gas pressure equalization hole 61 is not needed.

[0057] The technical scheme of the present application is exemplarily described above in combination with the embodiments and the drawings. Apparently, the specific implementation of the present application is not limited to the above-described manner, and various non-essential improvements or direct application of the inventive concept and technical scheme to other occasions without improvement are all within the protection scope of the present application.

Claims

1. An inlet and outlet valve for an oxygen generator, connecting an air conveyor and a molecular sieve, wherein the molecular sieve comprises at least two molecular towers, characterized in that, It includes a fixed valve plate and a movable valve plate. The end face of the fixed valve plate facing the movable valve plate is the fixed end face, and the end face of the movable valve plate facing the fixed valve plate is the movable end face. The fixed end face and the movable end face are in contact and seal each other. The fixed end face is provided with an air guide groove connected to the air conveyor, a plurality of air guide holes connected to the molecular sieve air port, a plurality of oxygen guide holes connected to the molecular sieve oxygen port, and an oxygen guide groove connected to the oxygen-consuming equipment. An air transport groove, which is always connected to the air guide groove, is provided on the moving end face. The air transport groove is connected to each air guide hole in sequence as the moving valve plate moves. A nitrogen venting groove is also provided on the moving end face. The nitrogen venting groove is connected to each air guide hole in sequence as the moving valve plate moves. An oxygen transport groove, which is always connected to the oxygen guide groove, is also provided on the moving end face. The oxygen transport groove is connected to each oxygen guide hole in sequence as the moving valve plate moves. Two oxygen transport tanks are provided; as the moving valve plate moves, one oxygen transport tank is simultaneously connected to a molecular tower along with the air guide tank, and this molecular tower realizes air intake and oxygen exhaust; the other oxygen transport tank is simultaneously connected to another molecular tower along with the nitrogen exhaust tank, and this molecular tower performs nitrogen exhaust and oxygen backflushing.

2. The air inlet and outlet valve for an oxygen concentrator according to claim 1, characterized in that, The oxygen transport trough includes an elongated groove and a circular hole on the moving end face, the circular hole being always connected to the oxygen guide trough; the elongated groove moves with the moving valve plate and is connected to each oxygen guide hole in sequence; the moving valve plate has a guide groove inside, the guide groove connecting the elongated groove and the circular hole.

3. The air inlet and outlet valve for an oxygen concentrator according to claim 1, characterized in that, The fixed valve plate is provided with an air inlet that is always connected to the air guide groove, an oxygen outlet that is always connected to the oxygen guide groove, an air outlet corresponding to the number of air guide holes, and an oxygen inlet corresponding to the number of oxygen guide holes. The air outlet and the air guide hole are connected in a one-to-one correspondence, and the oxygen inlet and the oxygen guide hole are connected in a one-to-one correspondence. The air outlet is connected to the molecular sieve air port, and the oxygen inlet is connected to the molecular sieve oxygen port.

4. The air inlet and outlet valve for an oxygen concentrator according to claim 1, characterized in that, Both the fixed valve plate and the movable valve plate are cylindrical. The movable valve plate is connected to a rotating shaft, and the movable valve plate rotates around the axis of the rotating shaft under the drive of the rotating shaft. Both the air guide groove and the oxygen guide groove are annular and coaxial with the rotating shaft; both the air guide holes and the oxygen guide holes are evenly distributed in a ring around the rotating shaft. The two oxygen transport tanks are symmetrically arranged around the axis of rotation; the arc length between the two oxygen transport tanks is an integer multiple of the arc length between two adjacent oxygen inlet holes; the arc length between the air transport tank and the nitrogen removal tank is adapted to the arc length between the two oxygen transport tanks; along the radial direction of the moving end face, the air transport tank and the nitrogen removal tank are respectively arranged inside the two oxygen transport tanks, and the air transport tank and the oxygen transport tank outside it are simultaneously connected to the same molecular tower, and the nitrogen removal tank and the oxygen transport tank outside it are simultaneously connected to another molecular tower.

5. The air inlet and outlet valve for an oxygen concentrator according to claim 4, characterized in that, The rotating shaft is connected to the axis of the moving valve plate. The air guide holes are evenly distributed on the outside of the air guide groove, and the oxygen guide holes are evenly distributed on the outside of the air guide groove. The line connecting adjacent air guide holes and oxygen guide holes passes through the center of the air guide groove. The line connecting the air transport groove and the rotating shaft coincides with the line connecting the oxygen transport groove and the rotating shaft.

6. The air inlet and outlet valve for an oxygen concentrator according to claim 5, characterized in that, The width of the air transport groove in the radial direction of the rotating shaft is greater than the distance between the inner side of the air guide groove and the outer side of the air guide hole; the width of the long groove of the oxygen transport groove and the air transport groove are adapted to each other in the rotation direction of the moving valve plate and are both greater than the width of the oxygen guide hole.

7. The air inlet and outlet valve for an oxygen concentrator according to claim 5, characterized in that, The moving valve plate has a square hole at its center, and the fixed valve plate has a clearance hole along the axis of the air guide groove. One end of the rotating shaft passes through the clearance hole and is inserted into the square hole to connect with the moving valve plate; the other end of the rotating shaft is connected to a drive motor.

8. The air inlet and outlet valve for an oxygen concentrator according to claim 5, characterized in that, The movable valve plate is fitted with a valve body, and the valve body has a cylindrical cavity with an inner diameter adapted to the outer diameter of the movable valve plate. The end face of the movable valve plate away from the fixed valve plate is the outer end face. A guide post is fixed on the outer end face, and a helical spring is fitted on the outside of the guide post. The helical spring presses the movable valve plate against the fixed valve plate so that the movable end face and the fixed end face are sealed. Several limiting grooves are provided along the axial direction on the outer circumference of the movable valve plate, and an arc-shaped retaining spring is provided in the limiting groove.

9. The air inlet and outlet valve for an oxygen concentrator according to claim 8, characterized in that, The moving valve plate is provided with a nitrogen channel connecting the nitrogen venting tank and the cylindrical cavity, and the valve body is provided with a nitrogen outlet connecting the cylindrical cavity.

10. The air inlet and outlet valve for an oxygen concentrator according to claim 1, characterized in that, The number of air guide holes is 2+2N (N is a positive integer). Several pressure equalization holes are also provided on the moving end face. The pressure equalization holes are connected in pairs. As the moving valve plate moves, the pressure equalization holes are connected to the oxygen guide holes in sequence. The sum of the number of pressure equalization holes and the number of two oxygen transport tanks is adapted to the number of oxygen guide holes. The number of oxygen guide holes is adapted to the number of molecular towers in the molecular sieve.

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