VPSA medical molecular sieve oxygen generator

Abstract

This invention relates to the field of oxygen concentrators and discloses a VPSA medical molecular sieve oxygen concentrator, comprising an air filter, a blower, a vacuum pump, a cooler, an adsorption system, an oxygen buffer tank, and a control system. The air filter includes a filter element, a main housing, a first shielding member, a second shielding member, and a pneumatic transmission assembly. The main housing is connected to the air inlet of the blower via a pipe. The filter element is installed inside the main housing, and the circumferential sidewall of the main housing has an annular perforation that contacts the outer sidewall of the filter element. The first shielding member is installed within the annular perforation of the main housing and includes several first annular shielding plates coaxially arranged with the annular perforation. A first connecting rod is fixed together among the several first annular shielding plates. When the oxygen concentrator of this invention stops working, the filter element is completely shielded, preventing external air from contacting the filter element. This prevents the filter element from contacting impurities in the air when not in use, thus extending the service life of the filter element.

Description

Technical Field

[0001] This invention relates to the field of oxygen generator technology, and more particularly to a VPSA medical molecular sieve oxygen generator. Background Technology

[0002] An oxygen concentrator is a complete set of equipment that uses air as raw material to produce oxygen (or liquid oxygen), nitrogen (or liquid nitrogen), and mixed gases such as argon, neon-helium, and krypton-xenon. Among them, the VPSA molecular sieve oxygen concentrator is a commonly used type in the medical industry. The VPSA molecular sieve oxygen concentrator uses a mixed bed formed by a special molecular sieve and a desiccant to selectively adsorb impurities such as nitrogen, carbon dioxide, and water from the air, causing oxygen to accumulate and be collected at the end of the bed. Under vacuum conditions, the saturated molecular sieve bed is desorbed, thus producing oxygen with high purity (90-95%) through circulation.

[0003] In existing technology, VPSA molecular sieve oxygen generation equipment includes a blower, a vacuum pump, a cooler, an adsorption system, an oxygen buffer tank, and a control system. The blower provides raw air to the entire system; the vacuum pump maintains an ideal vacuum state, ensuring normal desorption and enabling continuous nitrogen and oxygen production; the cooler lowers the temperature of the air supplied by the blower to the required process operating temperature before sending it to the adsorption towers for adsorption; the adsorption system consists of two adsorption towers filled with zeolite molecular sieve adsorbent and piping valves, used to adsorb nitrogen, carbon dioxide, water vapor, etc., from the air; the oxygen buffer tank stores the finished oxygen and stabilizes the pressure of the entire system; the control system, through a preset control program, controls the opening and closing of various pneumatic valves via solenoid valves, enabling the adsorption system to perform adsorption and regeneration within a specified time.

[0004] To ensure the air supplied by the blower is sufficiently pure, an air filter is typically installed at the blower's air inlet to filter out particulate impurities. Existing air filters generally use a built-in filter element to remove particulate impurities, with a portion of the filter element directly in contact with the air. However, even when not in use, the filter element remains in contact with air, causing impurities to accumulate and shortening its lifespan. Summary of the Invention

[0005] In view of this, the purpose of the present invention is to provide a VPSA medical molecular sieve oxygen generator, which solves the problem mentioned in the background art that the filter element of the air filter will also come into contact with air when it is not working, resulting in some impurities adhering to the filter element even when it is not working, thus shortening the service life of the filter element.

[0006] The present invention solves the above-mentioned technical problems through the following technical means:

[0007] A VPSA medical molecular sieve oxygen generator includes an air filter, a blower, a vacuum pump, a cooler, an adsorption system, an oxygen buffer tank, and a control system. The air filter includes a filter element, a main housing, a first shielding member, a second shielding member, and a pneumatic transmission assembly. The main housing is connected to the air inlet of the blower via a pipe. The filter element is installed inside the main housing, and the circumferential sidewall of the main housing has an annular perforation that contacts the outer sidewall of the filter element. The first shielding member is installed within the annular perforation of the main housing and includes several first annular shielding plates coaxially arranged with the annular perforation. A first connecting rod is fixed between the several first annular shielding plates. The several first annular shielding plates are evenly spaced along their own axial direction, dividing the annular perforation into several evenly spaced annular perforations. The second shielding member slides along the axial direction of the annular perforation. The second shielding component is mounted on the outer wall of the main housing. It includes several second annular shielding plates coaxially arranged with the annular hollow portion. A second connecting rod is fixed between the several second annular shielding plates. The several second annular shielding plates are arranged at equal intervals along their own axial direction. The number of second annular shielding plates is equal to the number of annular holes and corresponds one-to-one. The second annular shielding plates can seal / open the annular holes. The pneumatic transmission assembly includes a piston cylinder, a first spring, a piston plate, a piston rod, and a connecting cover. The piston cylinder is fixed inside the main housing. The piston plate is slidably mounted inside the piston cylinder. The first spring is installed between the piston plate and the bottom side of the piston cylinder. The bottom side of the piston cylinder communicates with the inside of the main housing. One end of the piston rod is fixed to the piston plate. The other end of the piston rod extends to the upper side of the main housing and abuts against the connecting cover. The connecting cover is mounted on the second shielding component.

[0008] Furthermore, the first shielding member is slidably installed in the annular hollow part along the axial direction of the annular hollow part, and a stop plate is fixed at the lower end of the first connecting rod. The stop plate is located on the movement trajectory of the second annular shielding plate on the bottom side, and a second spring is provided between the stop plate and the main housing.

[0009] Furthermore, a pressure sensor is installed on the bottom side of the piston cylinder, the lower end of the first spring abuts against the pressure sensor, and the upper end of the first spring abuts against the piston plate. The pressure sensor is electrically connected to the control system. When the pressure received by the pressure sensor reaches the target pressure, the control system controls the oxygen generator to stop working.

[0010] Furthermore, the main housing includes a lower housing, an upper housing, and an upper end cover. The lower housing is hollow inside and open on the upper side. The upper housing is hollow inside and open on both the upper and lower sides. The upper end cover is hollow inside and open on the lower side. Several support rods are fixed between the lower housing and the upper housing. A reserved area between the lower housing and the upper housing forms an annular hollow section. The bottom side of the lower housing is provided with an air outlet for connecting a blower. The lower open end of the upper end cover is threadedly connected to the upper open end of the upper housing.

[0011] Furthermore, the first annular baffle plate has a sliding hole adapted to the support rod, the support rod passes through the sliding hole and can move axially within the sliding hole; the lower housing has a mounting groove for mounting the lower end of the support rod, the abutment plate and the second spring.

[0012] Furthermore, a connecting frame is fixed between the piston cylinder and the lower housing; several through holes are provided on the circumferential sidewall of the piston cylinder near the bottom, and the through holes connect the cavity below the piston plate inside the piston cylinder with the interior of the main housing; the upper side of the piston cylinder has an open structure, and when the upper end cover is installed on the upper housing, the upper end cover abuts against the upper open end of the piston cylinder and separates the cavity above the piston plate inside the piston cylinder from the interior of the main housing.

[0013] Furthermore, a lower annular mounting plate is fixed on the circumferential sidewall of the lower housing, and an upper annular mounting plate is fixed on the circumferential sidewall of the upper housing. The second connecting rod is slidably mounted on the lower annular mounting plate and the upper annular mounting plate along its own axis. The lower end of the second connecting rod passes through the lower annular mounting plate and is fixed with a limit plate. The upper end of the second connecting rod passes through the upper annular mounting plate and is fixed with a first annular connecting plate. The first annular connecting plate is detachably connected to the connecting cover.

[0014] Furthermore, the connecting cover includes a second annular connecting plate, a connecting part, and a connecting bolt. The lower end of the second annular connecting plate is threadedly connected to the upper end of the first annular connecting plate. The connecting part is disposed in the inner ring of the second annular connecting plate, and a plurality of fixing plates are fixed between the connecting part and the second annular connecting plate. The bottom side of the connecting part has a blind hole, the upper end of the piston rod abuts against the blind hole, and the upper end of the piston rod is provided with a threaded hole. The screw of the connecting bolt passes through the connecting part and is threadedly connected to the threaded hole of the piston rod, and the screw head of the connecting bolt abuts against the upper side of the connecting part.

[0015] Furthermore, the second annular connecting plate has an anti-slip part on its circumferential sidewall.

[0016] The beneficial effects of this invention are:

[0017] According to the technical solution of this application, when the oxygen concentrator is not in operation, each of the second annular baffles in the second baffle will seal its corresponding annular leakage hole, so that the air outside the main housing cannot contact the filter element. When the oxygen concentrator is in operation, the negative pressure suction generated by the blower enters the main housing. Since the annular leakage hole is sealed by the second annular baffle, the negative pressure suction inside the main housing will first enter the piston cylinder through the through hole on the piston cylinder, and then drive the piston plate inside the piston cylinder to compress the first spring and move downward. The piston plate will then drive the second baffle to move downward through the piston rod and the connecting cover, so that each of the second annular baffles opens its corresponding annular leakage hole, allowing the outside air to pass smoothly through the annular leakage hole and contact the filter element. Finally, after being filtered by the filter element, it is delivered to the blower. When the oxygen concentrator stops working, under the elastic force of the first spring, the piston plate, piston rod, connecting cover, and second shielding component all return to their original positions. This allows each second annular shielding plate to seal its corresponding annular leakage hole again, preventing air from outside the main housing from contacting the filter element. Consequently, the filter element will not come into contact with impurities in the air when it is not in operation, thus extending the service life of the filter element. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of the VPSA medical molecular sieve oxygen generator in the embodiments of this application;

[0019] Figure 2 This is a cross-sectional view of the VPSA medical molecular sieve oxygen generator in the embodiments of this application;

[0020] Figure 3 This is an embodiment of the present application. Figure 2 Enlarged view of point A in the middle;

[0021] Figure 4 This is a schematic diagram of the main housing structure in an embodiment of this application;

[0022] Figure 5 This is a schematic diagram of the structure of the first shielding member in the embodiments of this application;

[0023] Figure 6 This is a schematic diagram of the structure when the first shielding member and the main housing are engaged in the embodiment of this application;

[0024] Figure 7 This is a schematic diagram of the structure of the second shielding member in the embodiments of this application;

[0025] Among them, 100 is the filter element; 200 is the main housing; 210 is the lower housing; 211 is the air outlet; 212 is the mounting groove; 213 is the lower annular mounting plate; 220 is the upper housing; 221 is the upper annular mounting plate; 230 is the upper end cover; 240 is the support rod; 250 is the annular hollow part; 260 is the annular leakage hole; 300 is the first shielding component; 310 is the first annular shielding plate; 311 is the sliding hole; 320 is the first connecting rod; 330 is the abutment plate; 340 is the second spring; and 400 is the second shielding component. 410. Second annular baffle plate; 420. Second connecting rod; 430. Limiting plate; 440. First annular connecting plate; 500. Pneumatic transmission assembly; 510. Piston cylinder; 511. Connecting frame; 512. Through hole; 513. Pressure sensor; 520. First spring; 530. Piston plate; 540. Piston rod; 541. Threaded hole; 550. Connecting cover; 551. Second annular connecting plate; 552. Connecting part; 553. Connecting bolt; 554. Fixing plate; 555. Anti-slip part. Detailed Implementation

[0026] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0027] like Figures 1-7 As shown in the illustration, this application provides a VPSA medical molecular sieve oxygen generator, which includes an air filter, a blower, a vacuum pump, a cooler, an adsorption system, an oxygen buffer tank, and a control system. The oxygen generator's oxygen production function is achieved through the cooperation of these components. Furthermore, the blower, vacuum pump, cooler, adsorption system, oxygen buffer tank, and control system are all existing technologies, and their composition and principles will not be described in detail here.

[0028] The air filter includes a filter element 100, a main housing 200, a first shielding member 300, a second shielding member 400, and a pneumatic transmission assembly 500. The filter element 100 is primarily a ring-shaped dust collector filter element 100, which is detachably installed inside the main housing 200, with its outer side wall contacting the inner side wall of the main housing 200. The main housing 200 is a circular housing, mainly comprising a lower housing 210, an upper housing 220, and an upper end cover 230. The lower housing 210 is hollow internally and open at the top, the upper housing 220 is hollow internally and open at both the top and bottom, and the upper end cover 230 is hollow internally and open at the bottom. Two support rods 240 are fixed between the lower housing 210 and the upper housing 220, and these two support rods 240 serve to secure the lower housing 210 and the upper housing 220 together. Furthermore, a certain gap is reserved between the lower housing 210 and the upper housing 220. This gap forms an annular perforated portion 250 in the area between the lower housing 210 and the upper housing 220. The annular perforated portion 250 contacts the outer wall of the filter element 100, allowing external air to pass through the filter element 100 and enter the interior of the main housing 200, thus achieving air filtration. The bottom side of the lower housing 210 is provided with an air outlet 211 for connecting to a blower. This air outlet 211 is connected to the air inlet of the blower through an external pipe, and the air filtered by the filter element 100 can be delivered to the blower through this air outlet 211. The lower open end of the upper end cover 230 is threadedly connected to the upper open end of the upper housing 220 to facilitate the removal of the upper end cover 230 for replacement or cleaning of the filter element 100.

[0029] The first shielding member 300 is installed within the annular hollow portion 250 of the main housing 200. The first shielding member 300 includes a plurality of first annular shielding plates 310, which are coaxially arranged with the annular hollow portion 250. In this embodiment, the number of first annular shielding plates 310 is specifically set to six. Two first connecting rods 320 are fixed together among the six first annular shielding plates 310. The axis of the first connecting rods 320 is parallel to the axis of the first annular shielding plates 310. The main function of the two first connecting rods 320 is to fix the six first annular shielding plates 310 together. The six first annular shielding plates 310 are arranged at equal intervals along their own axial direction, and the distance between two adjacent first annular shielding plates 310 is equal to the height of the first annular shielding plate 310. The six first annular shielding plates 310 divide the annular hollow portion 250 into six annular holes 260 arranged at equal intervals. The height of the annular holes 260 is equal to the height of the first annular shielding plates 310. The shielding effect of the first shielding member 300 prevents the part of the filter element 100 that is shielded by the first annular shielding plate 310 from direct contact with the air. Only the part exposed at the annular leakage hole 260 can be in direct contact with the air.

[0030] The second shielding member 400 is slidably mounted on the outer wall of the main housing 200 along the axial direction of the annular hollow portion 250. The second shielding member 400 includes a plurality of second annular shielding plates 410, which are coaxially arranged with the annular hollow portion 250. Two second connecting rods 420 are fixed together among the plurality of second annular shielding plates 410, and the axes of the second connecting rods 420 are parallel to the axes of the second annular shielding plates 410. The plurality of second annular shielding plates 410 are arranged at equal intervals along their own axial direction. The number of second annular shielding plates 410 is equal to the number of annular holes 260 and corresponds one-to-one. In this embodiment, the number of second annular shielding plates 410 is specifically six. The height of the second annular shielding plates 410 can be set to be slightly larger than the height of the annular holes 260. When the second shielding member 400 slides in the vertical direction, each second annular shielding plate 410 can seal / open its corresponding annular hole 260.

[0031] The pneumatic transmission assembly 500 includes a piston cylinder 510, a first spring 520, a piston plate 530, a piston rod 540, and a connecting cover 550. The piston cylinder 510 is fixed inside the main housing 200. Specifically, a connecting frame 511 is fixed between the piston cylinder 510 and the lower housing 210, securing the piston cylinder 510 to the lower housing 210. The piston plate 530 is slidably mounted vertically inside the piston cylinder 510, separating the upper and lower cavities within the piston cylinder 510. The first spring 520 is installed between the piston plate 530 and the bottom side of the piston cylinder 510. Furthermore, several through holes 512 are formed on the circumferential sidewall of the piston cylinder 510 near the bottom. These through holes 512 connect the cavity below the piston plate 530 inside the piston cylinder 510 to the interior of the main housing 200, allowing the piston plate 530 to move smoothly downwards within the piston cylinder 510 and compress the first spring 520. Furthermore, the upper side of the piston cylinder 510 is an open structure. When the upper end cover 230 is installed on the upper housing 220, the upper end cover 230 can abut against the upper open end of the piston cylinder 510, separating the cavity above the piston plate 530 inside the piston cylinder 510 from the interior of the main housing 200, thereby preventing the cavity above the piston plate 530 inside the piston cylinder 510 from contacting the gas inside the housing. The lower end of the piston rod 540 is fixed to the piston plate 530, and the upper end of the piston rod 540 passes through the upper end cover 230, extending to the upper side of the main housing 200. The upper end of the piston rod 540 abuts against the connecting cover 550, which is installed on the second blocking member 400 and moves together with the second blocking member 400.

[0032] Through the above technical solution, when the oxygen concentrator is not in operation, each of the second annular baffles 410 in the second baffle 400 seals its corresponding annular leakage hole 260, preventing air outside the main housing 200 from contacting the filter element 100; while when the oxygen concentrator is in operation, the negative pressure suction generated by the blower enters the main housing 200, and because the annular leakage hole 260 is sealed by the second annular baffle 410, the negative pressure suction inside the main housing 200 first passes through the piston. The through hole 512 on the cylinder 510 enters the interior of the piston cylinder 510, and then drives the piston plate 530 inside the piston cylinder 510 to compress the first spring 520 and move downward. The piston plate 530 then drives the second baffle 400 to move downward through the piston rod 540 and the connecting cover 550, thereby causing each second annular baffle 410 to open its corresponding annular leakage hole 260, so that the outside air can pass smoothly through the annular leakage hole 260 and contact the filter element 100. Finally, after being filtered by the filter element 100, it is delivered to the blower. When the oxygen concentrator stops working, under the elastic force of the first spring 520, the piston plate 530, piston rod 540, connecting cover 550, and second shield 400 all reset, so that each second annular shield 410 can seal its corresponding annular leakage hole 260 again, preventing air outside the main housing 200 from contacting the filter element 100. This ensures that the filter element 100 will not come into contact with impurities in the air when it is not working, thus extending the service life of the filter element 100.

[0033] In this embodiment, the first blocking member 300 is slidably installed within the annular hollow portion 250 along the axial direction of the annular hollow portion 250. Specifically, the first annular blocking plate 310 has a sliding hole 311 adapted to the support rod 240. The support rod 240 passes through the sliding hole 311 and can move axially within the sliding hole 311, thereby slidably installing the entire first blocking member 300 within the annular hollow portion 250. In addition, the lower end of the first connecting rod 320 is fixed with a stop plate 330, and the second connecting rod 420 of the second blocking member 400 passes through the stop plate 330 but does not contact the stop plate 330. The stop plate 330 is located on the movement trajectory of the bottommost second annular blocking plate 410, and a second spring 340 is provided between the stop plate 330 and the main housing 200. The lower housing 210 has a mounting groove 212 for mounting the lower end of the support rod 240, the stop plate 330, and the second spring 340. When the first blocking member 300 is only subjected to the elastic force of the second spring 340, the topmost second annular blocking plate 410 abuts against the lower end of the upper housing 220, while the bottommost second annular blocking plate 410 and the upper end of the lower housing 210 still retain an annular leakage hole 260.

[0034] When the second shield 400 moves downward under the action of the pneumatic transmission assembly 500 and opens all the annular holes 260, only a portion of the filter element 100 is exposed. When this exposed portion of the filter element 100 is covered with impurities, it creates resistance to the air intake. This causes the negative pressure suction generated by the blower to act on the piston plate 530 again, compressing the first spring 520 and moving downward. At this point, the lowest second annular shield 410 of the second shield 400 abuts against the abutment plate 330 of the first shield 300, driving the entire second shield 400 downward. This causes all the second annular shields 410 in the second shield 400 to shift, as well as all the annular holes 260, exposing the remaining impurity-covered area of ​​the filter element 100, allowing this portion to be filtered by the air. This setup allows for full utilization of filter element 100 and extends its service life.

[0035] In this embodiment, a pressure sensor 513 is mounted on the bottom side of the piston cylinder 510. The lower end of the first spring 520 abuts against the pressure sensor 513, and the upper end of the first spring 520 abuts against the piston plate 530. The pressure sensor 513 is electrically connected to the control system. When the pressure received by the pressure sensor 513 reaches the target pressure, the control system controls the oxygen generator to stop working.

[0036] When most of the filter element 100 is covered with impurities, its air intake resistance increases drastically. In this state, most of the suction force from the blower acts on the piston, increasing the compression of the first spring 520. The pressure sensor 513 detects the pressure of the first spring 520. When this pressure reaches the target pressure, it indicates that the filter element 100 has accumulated a significant amount of impurities and needs cleaning or replacement. Furthermore, increased air intake resistance of the filter element 100 can affect equipment such as the blower. Therefore, when the pressure of the first spring 520 on the pressure sensor 513 reaches the target pressure, the oxygen concentrator can be stopped by the control system to protect it and extend its lifespan. It should be noted that the target pressure can be set according to the specific conditions of the first spring 520.

[0037] In this embodiment, a lower annular mounting plate 213 is fixed to the circumferential sidewall of the lower housing 210, and an upper annular mounting plate 221 is fixed to the circumferential sidewall of the upper housing 220. The second connecting rod 420 is slidably mounted on the lower annular mounting plate 213 and the upper annular mounting plate 221 along its own axial direction. The lower end of the second connecting rod 420 passes through the lower annular mounting plate 213 and is fixed with a limiting plate 430. The limiting plate 430 prevents the second connecting rod 420 from moving excessively upward, causing it to detach from the lower annular mounting plate 213. The upper end of the second connecting rod 420 passes through the upper annular mounting plate 221, and the upper ends of both second connecting rods 420 are jointly fixed with a first annular connecting plate 440. The first annular connecting plate 440 is detachably connected to the connecting cover 550.

[0038] In this embodiment, the connecting cover 550 includes a second annular connecting plate 551, a connecting portion 552, and a connecting bolt 553. The lower end of the second annular connecting plate 551 is threaded to the upper end of the first annular connecting plate 440, facilitating the disassembly and installation of the connecting cover 550 and the first annular connecting plate 440. The connecting portion 552 is disposed in the inner ring of the second annular connecting plate 551, and a plurality of fixing plates 554 are fixed between the connecting portion 552 and the second annular connecting plate 551, thereby fixing the connecting portion 552 and the second annular connecting plate 551 together. The bottom side of the connecting portion 552 has a blind hole, and the upper end of the piston rod 540 can abut against the blind hole. The upper end of the piston rod 540 is provided with a threaded hole 541. The screw of the connecting bolt 553 passes through the connecting part 552 and is threaded into the threaded hole 541 of the piston rod 540. The head of the connecting bolt 553 abuts against the upper side of the connecting part 552, thereby detachably connecting the piston rod 540 to the connecting cover 550 for easy disassembly and installation.

[0039] In this embodiment, the second annular connecting plate 551 is provided with an anti-slip part 555 on its circumferential sidewall. By providing the anti-slip part 555, it is easy to rotate the second annular connecting plate 551, so as to realize the assembly and disassembly between the second annular connecting plate 551 and the first annular connecting plate 440.

[0040] The above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit it. Although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the present invention, and all such modifications and substitutions should be covered within the scope of the claims of the present invention. Technical aspects, shapes, and structures not described in detail in this invention are all well-known technologies.

Claims

1. A VPSA medical molecular sieve oxygen generator, comprising an air filter, a blower, a vacuum pump, a cooler, an adsorption system, an oxygen buffer tank, and a control system, characterized in that, The air filter includes a filter element (100), a main housing (200), a first shield (300), a second shield (400), and a pneumatic transmission assembly (500). The main housing (200) is connected to the air inlet of a blower via a pipe. The filter element (100) is installed inside the main housing (200). The circumferential sidewall of the main housing (200) has an annular perforated portion (250) that contacts the outer sidewall of the filter element (100). The first shield (300) is installed inside the annular perforated portion (250) of the main housing (200). The first shield (300) includes several components that contact the annular perforated portion. (250) A first annular baffle plate (310) is coaxially arranged, and a first connecting rod (320) is fixed together among a plurality of the first annular baffle plates (310). The plurality of the first annular baffle plates (310) are arranged at equal intervals along their own axial direction, and the plurality of the first annular baffle plates (310) divide the annular hollow part (250) into a plurality of annular holes (260) arranged at equal intervals; the second baffle member (400) is slidably installed on the outer side wall of the main housing (200) along the axial direction of the annular hollow part (250), and the second baffle member (400) includes a plurality of holes that are coaxial with the annular hollow part (250). A second annular baffle plate (410) is provided on the shaft. A second connecting rod (420) is fixed together among a plurality of second annular baffle plates (410). The plurality of second annular baffle plates (410) are arranged at equal intervals along their own axial direction. The number of second annular baffle plates (410) is equal to the number of annular leakage holes (260) and corresponds one-to-one. The second annular baffle plates (410) can seal / open the annular leakage holes (260). The pneumatic transmission assembly (500) includes a piston cylinder (510), a first spring (520), a piston plate (530), a piston rod (540), and a connecting cover (550). The piston cylinder (510) is fixed inside the main housing (200), the piston plate (530) is slidably installed inside the piston cylinder (510), the first spring (520) is installed between the piston plate (530) and the bottom side of the piston cylinder (510), and the bottom side of the piston cylinder (510) communicates with the inside of the main housing (200). One end of the piston rod (540) is fixed on the piston plate (530), and the other end of the piston rod (540) extends to the upper side of the main housing (200) and abuts against the connecting cover (550). The connecting cover (550) is installed on the second shielding member (400).

2. The oxygen generator according to claim 1, characterized in that, The first shielding member (300) is slidably installed in the annular hollow part (250) along the axial direction of the annular hollow part (250). The lower end of the first connecting rod (320) is fixed with a stop plate (330). The stop plate (330) is located on the movement trajectory of the second annular shielding plate (410) on the bottom side, and a second spring (340) is provided between the stop plate (330) and the main housing (200).

3. The oxygen generator according to claim 2, characterized in that, A pressure sensor (513) is installed on the bottom side of the piston cylinder (510). The lower end of the first spring (520) abuts against the pressure sensor (513), and the upper end of the first spring (520) abuts against the piston plate (530). The pressure sensor (513) is electrically connected to the control system. When the pressure received by the pressure sensor (513) reaches the target pressure, the control system controls the oxygen generator to stop working.

4. The oxygen generator according to claim 3, characterized in that, The main housing (200) includes a lower housing (210), an upper housing (220), and an upper end cover (230). The lower housing (210) is hollow inside and open on the upper side. The upper housing (220) is hollow inside and open on both the upper and lower sides. The upper end cover (230) is hollow inside and open on the lower side. Several support rods (240) are fixed between the lower housing (210) and the upper housing (220). A reserved area between the lower housing (210) and the upper housing (220) forms an annular hollow part (250). The bottom side of the lower housing (210) is provided with an air outlet (211) for connecting a blower. The lower open end of the upper end cover (230) is threadedly connected to the upper open end of the upper housing (220).

5. The oxygen generator according to claim 4, characterized in that, The first annular baffle plate (310) has a sliding hole (311) adapted to the support rod (240), the support rod (240) passes through the sliding hole (311) and can move axially within the sliding hole (311); the lower housing (210) has a mounting groove (212) for mounting the lower end of the support rod (240), the abutment plate (330) and the second spring (340).

6. The oxygen generator according to claim 5, characterized in that, A connecting frame (511) is fixed between the piston cylinder (510) and the lower housing (210); a plurality of through holes (512) are provided on the circumferential sidewall of the piston cylinder (510) near the bottom, and the through holes (512) connect the cavity below the piston plate (530) in the piston cylinder (510) with the interior of the main housing (200); the upper side of the piston cylinder (510) is an open structure, and when the upper end cover (230) is installed on the upper housing (220), the upper end cover (230) abuts against the upper open end of the piston cylinder (510) and separates the cavity above the piston plate (530) in the piston cylinder (510) from the interior of the main housing (200).

7. The oxygen generator according to claim 6, characterized in that, A lower annular mounting plate (213) is fixed on the circumferential sidewall of the lower housing (210), and an upper annular mounting plate (221) is fixed on the circumferential sidewall of the upper housing (220). The second connecting rod (420) is slidably mounted on the lower annular mounting plate (213) and the upper annular mounting plate (221) along its own axis. The lower end of the second connecting rod (420) passes through the lower annular mounting plate (213) and is fixed with a limit plate (430). The upper end of the second connecting rod (420) passes through the upper annular mounting plate (221) and is fixed with a first annular connecting plate (440). The first annular connecting plate (440) is detachably connected to the connecting cover (550).

8. The oxygen generator according to claim 7, characterized in that, The connecting cover (550) includes a second annular connecting plate (551), a connecting part (552), and a connecting bolt (553). The lower end of the second annular connecting plate (551) is threaded to the upper end of the first annular connecting plate (440). The connecting part (552) is disposed in the inner ring of the second annular connecting plate (551), and a plurality of fixing plates (554) are fixed between the connecting part (552) and the second annular connecting plate (551). The bottom side of the connecting part (552) has a blind hole. The upper end of the piston rod (540) abuts against the blind hole. The upper end of the piston rod (540) is provided with a threaded hole (541). The screw of the connecting bolt (553) passes through the connecting part (552) and is threadedly connected to the threaded hole (541) of the piston rod (540). The head of the connecting bolt (553) abuts against the upper side of the connecting part (552).

9. The oxygen generator according to claim 8, characterized in that, The second annular connecting plate (551) has an anti-slip part (555) on its circumferential side wall.

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