Rotary valve for oxygen concentrator and high-efficiency oxygen concentrator

Abstract

The present invention discloses a rotary valve for an oxygen concentrator, comprising a movable die, a first fixed die, and a second fixed die. The end surfaces of the first fixed die and the second fixed die facing the movable die are respectively a first sealing end surface and a second sealing end surface. The two end surfaces of the movable die are respectively a third sealing end surface and a fourth sealing end surface, which are sealed with the first sealing end surface and the second sealing end surface respectively. When the movable die rotates, the first air guide groove is always connected to the first air guide ring groove and is intermittently connected to the air guide column hole. The second air guide groove is intermittently connected to the air guide column hole. The oxygen guide movable hole is always connected to the second air guide ring groove and is intermittently connected to the oxygen guide fixed hole. The nitrogen exhaust movable hole is always connected to the nitrogen exhaust fixed hole. The present invention uses a rotary valve to conduct air and seal through a plane end surface, which greatly reduces the processing difficulty and cost, has a high yield rate, a long service life, and is not prone to failure.

Description

Technical Field

[0001] The present invention belongs to the field of oxygen concentrators, and more particularly relates to a rotary valve for an oxygen concentrator and a high-efficiency oxygen concentrator. Background Art

[0002] Oxygen concentrators are widely used in clinical oxygen supply and home oxygen delivery. Molecular sieve separation oxygen concentrators have become mainstream. These devices utilize the molecular sieve's properties of adsorption under pressure and desorption under reduced pressure to separate medical oxygen from air at low pressure. This method allows for rapid, on-site oxygen production at room temperature and pressure. It is safe and reliable, with compact size, rapid oxygen production, high oxygen concentration, and low cost.

[0003] In the invention application for a six-tower adsorption rotary valve with application number 202110402595.3, a rotary valve for an oxygen concentrator is proposed. Air, oxygen, and nitrogen are guided by air guide grooves and air guide holes on the outer circumferential side of a cylindrical diaphragm. During production, it was found that this type of rotary valve has extremely high requirements for machining precision and sealing, is extremely difficult to produce, and is extremely costly. It also has a short service life and is prone to leakage and cross-gas problems, which can affect normal use and even cause medical accidents. Summary of the Invention

[0004] The object of the present invention is to provide a rotary valve for an oxygen concentrator and a high-efficiency oxygen concentrator. The rotary valve changes the existing method of sealing and guiding gas through the outer circumferential side of the cylinder and guides gas and seals through the flat end face, which greatly reduces the processing difficulty and cost, has a high yield rate, a long service life, and is not prone to failure.

[0005] The technical solution of the present invention is a rotary valve for an oxygen concentrator, comprising a valve body, the valve body comprising a cylindrical movable die piece and a first fixed die piece and a second fixed die piece respectively disposed at both ends of the movable die piece, the end surfaces of the first fixed die piece and the second fixed die piece facing the movable die piece being a first sealing end surface and a second sealing end surface, respectively, and the end surfaces of the movable die piece being a third sealing end surface and a fourth sealing end surface, respectively, and being sealed with the first sealing end surface and the second sealing end surface, respectively;

[0006] The first sealing end surface is provided with a first air-guiding annular groove connected to an air inlet, and a second air-guiding annular groove connected to an oxygen outlet is provided outside the first air-guiding annular groove; the first sealing end surface is also provided with an air-guiding column hole connected to an air-guiding external interface, the air-guiding column hole is provided between the first air-guiding annular groove and the second air-guiding annular groove, and the air-guiding external interface is connected to a molecular sieve air inlet;

[0007] The second sealing end surface is provided with an oxygen guide hole connected to the molecular sieve outlet and a nitrogen exhaust hole connected to the nitrogen exhaust outlet;

[0008] The third sealing end surface is provided with a first gas guide groove, a second gas guide groove and an oxygen guide hole, the second gas guide groove is provided with a nitrogen discharge hole, and the oxygen guide hole and the nitrogen discharge hole are both passed through the fourth sealing end surface;

[0009] During the rotation of the movable mold: the first air guide groove is always connected to the first air guide ring groove, and is intermittently connected to the air guide column hole; the second air guide groove is intermittently connected to the air guide column hole; the oxygen guide movable hole is always connected to the second air guide ring groove, and is intermittently connected to the oxygen guide fixed hole; the nitrogen exhaust movable hole is always connected to the nitrogen exhaust fixed hole.

[0010] Preferably, the movable die piece, the first fixed die piece and the second fixed die piece are all cylindrical and coaxially arranged; the first air guide ring groove and the second air guide ring groove are coaxial and coaxially arranged with the movable die piece.

[0011] Preferably, six air guide column holes are evenly and symmetrically arranged around the axis of the movable mold piece and are independently connected to an air guide external interface.

[0012] Preferably, two oxygen-conducting movable holes are symmetrically arranged about the axis of the movable mold, and six oxygen-conducting fixed holes are symmetrically evenly distributed about the axis of the movable mold; when the movable mold rotates, the two oxygen-conducting movable holes are intermittently connected to two of the six oxygen-conducting fixed holes.

[0013] Preferably, the first air guide groove includes a semi-annular groove opposite to and connected to the first air guide ring groove and a first rectangular groove connected to the semi-annular groove; when the movable mold rotates, the first rectangular groove is intermittently connected to the six air guide column holes.

[0014] Preferably, the second air guide groove is a second rectangular groove symmetrically arranged with the first rectangular groove and not connected with the semi-annular groove. When the movable mold piece rotates, the second rectangular groove is intermittently connected with the six air guide column holes.

[0015] Preferably, the nitrogen discharge fixed hole is set at the center of the second fixed die piece, and the nitrogen discharge movable hole passes through the center of the fourth sealing end face. When the movable die piece rotates, the nitrogen discharge movable hole is always connected to the nitrogen discharge fixed hole.

[0016] Preferably, a flat shaft hole connected to the drive shaft is provided at the center of the third sealing end surface, and a column hole for the drive shaft to pass through and having an inner diameter larger than an outer diameter of the drive shaft is provided at the center of the first fixed die plate;

[0017] The rotary valve further includes a valve body mounting frame, the valve body mounting frame including a first mounting ring plate for fixing the servo motor, a third mounting ring plate for fixing the molecular sieve, and a second mounting ring plate arranged parallel to each other;

[0018] The first mounting ring plate and the second mounting ring plate are fixedly connected, and the second mounting ring plate and the third mounting ring plate are connected by connecting screws;

[0019] The first fixed die plate, the movable die plate and the second fixed die plate are sequentially arranged between the second mounting ring plate and the third mounting ring plate; the second fixed die plate is away from the end face of the movable die plate, is fixedly mounted on the third mounting ring plate, and is connected with a hexa-molecular sieve connector; a coil spring is fixed on the side of the first mounting ring plate facing the second mounting ring plate, and the other end of the coil spring presses against the end face of the first fixed die plate away from the movable die plate.

[0020] A high-efficiency oxygen concentrator comprises an air compressor, a molecular sieve, the aforementioned rotary valve, and a servo motor for driving a movable die of the rotary valve to rotate;

[0021] The air compressor compresses air and delivers it to the molecular sieve through the air inlet of the rotary valve. The molecular sieve separates and outputs oxygen, and delivers it to the oxygen-using position through the oxygen outlet of the rotary valve. When the compressor is not working, the nitrogen in the molecular sieve is reversely delivered to the second air guide groove in the rotary valve through the air inlet of the rotary valve, and is discharged through the nitrogen exhaust hole and the nitrogen exhaust outlet.

[0022] Preferably, the servo motor is mounted on a side of the first mounting ring plate away from the second mounting ring plate, and the motor shaft of the servo motor passes through the coil spring and the column hole on the first fixed die plate in sequence, and then extends to the movable die plate, and is interference-fitted with the flat shaft hole provided on the third sealing end surface of the movable die plate;

[0023] The molecular sieve is fixed on the side of the third mounting ring plate away from the second mounting ring plate, and the molecular sieve includes six sieve cylinders, each of which is provided with an air inlet and an air outlet, and the six air inlets and six air outlets are respectively connected to the six air guide external interfaces on the first fixed die piece and the six molecular sieve connectors on the second fixed die piece;

[0024] The compressor is installed outside the rotary valve, and the outlet of the compressor is connected to the air inlet on the first fixed die; the nitrogen exhaust outlet on the second fixed die is connected to a negative pressure machine installed outside the rotary valve.

[0025] The beneficial effects of the rotary valve for an oxygen concentrator according to the technical solution of the present invention are as follows: the contact sealing between the planar first sealing end face and the third sealing end face, as well as the contact sealing between the second sealing end face and the fourth sealing end face, are achieved, thereby realizing the gas conduction and sealing of the valve body itself, greatly reducing the processing difficulty and cost, achieving a high yield, a long service life, and being less prone to failure.

[0026] The beneficial effects of the high-efficiency oxygen concentrator of the technical solution of the present invention are: by adopting the aforementioned rotary valve, the oxygen production effect is good, the failure rate is low, the cost is low, and the service life is long. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 This is a structural diagram of a rotary valve for an oxygen concentrator according to the technical solution of the present invention.

[0028] Figure 2 for Figure 1 The main view,

[0029] Figure 3 for Figure 2 Right view,

[0030] Figure 4 for Figure 2 Left view of

[0031] Figure 5 for Figure 2 Schematic diagram of the longitudinal section;

[0032] Figure 6 Schematic diagram of the valve body structure.

[0033] Figure 7 is a schematic cross-sectional view of the first fixed die piece,

[0034] Figure 8 for Figure 8 Middle AA section view,

[0035] Figure 9 for Figure 8 Middle BB section view,

[0036] Figure 10 This is a bottom view of the first fixed die piece.

[0037] Figure 11 It is a schematic diagram of the structure of the dynamic die.

[0038] Figure 12 is a schematic diagram of the structure of the second fixed die,

[0039] Figure 13 Schematic diagram of oxygen supply and nitrogen exhaust in the valve body. DETAILED DESCRIPTION

[0040] To facilitate those skilled in the art to understand the technical solution of the present invention, the technical solution of the present invention is further described with reference to the accompanying drawings.

[0041] like Figure 1 、 Figure 2 、 Figure 3As shown, the present invention discloses a rotary valve for an oxygen concentrator, comprising a valve body 100. The valve body 100 includes a cylindrical movable die 103 and first and second fixed die 101 and 102, respectively disposed at opposite ends of the movable die 103. The end surfaces of the first and second fixed die 101 and 102 facing the movable die 103 are a first sealing end surface 1011 and a second sealing end surface 1021, respectively. The end surfaces of the movable die 103 are a third sealing end surface 1031 and a fourth sealing end surface 1032, respectively, which seal against the first and second sealing end surfaces 1011 and 1031, respectively. The first, second, third, and fourth sealing end surfaces 1011, 1021, 1031, and 1032 are all planar. During machining, the flatness is no greater than 0.9 μm, and the surface roughness is less than 0.2 μm, to ensure sealing and gas conduction.

[0042] In the above technical solution, sealing and air guiding are performed through the flat end face, which greatly reduces the difficulty of valve body processing, greatly reduces processing costs, has a high yield rate, a long service life, and is less prone to failure.

[0043] like Figures 5 to 10 As shown in FIG, it is a schematic structural diagram of the first fixed mold piece 101. Figure 9 As mentioned above, the first sealing end face 1011 is provided with a first air guide ring groove 11 connected to the air inlet 1. A second air guide ring groove 31 connected to the oxygen outlet 3 is provided outside the first air guide ring groove 11. The first sealing end face 1011 is also provided with an air guide column hole 21 connected to the air guide external interface 2. The air guide column hole 21 is arranged between the first air guide ring groove 11 and the second air guide ring groove 31. The air guide external interface 2 is connected to the molecular sieve air inlet, and the air inlet 1 is connected to the compressor outlet. When the compressor is working, compressed air continuously enters the first air guide ring groove 11 from the compressor outlet through the air inlet 1. Then, the air enters the first air guide groove 12 (such as Figure 11 As shown), as the movable mold rotates, the air in the first air guide groove 12 intermittently enters the air guide column hole 21, and enters the molecular sieve due to the air guide external interface 2 connected to the air guide column hole 21, so that the molecules separate the air, and finally the molecular sieve outputs oxygen to achieve oxygen production.

[0044] like Figure 12 As shown, it is a schematic diagram of the structure of the second fixed die 102. In the second fixed die 102, an oxygen guide fixed hole 33 connected to the molecular sieve outlet and a nitrogen exhaust fixed hole 41 connected to the nitrogen exhaust outlet 4 are provided on the second sealing end surface 1021. One end of the oxygen guide fixed hole 33 is connected to the molecular sieve outlet to allow oxygen to enter; the other end of the oxygen guide fixed hole 33 is connected to the oxygen guide movable hole 32 (as shown in FIG. 1 ) on the movable die 103. Figure 11As shown), it is connected with the second air guide ring groove 31 on the first fixed mold piece 101 and the oxygen outlet 3 on the second air guide ring groove 31 through the oxygen guide hole 32, and the oxygen produced in the molecular sieve is output and supplied for oxygen absorption or transported to the oxygen use position.

[0045] like Figure 11 Figure 1 shows the structure of the movable die 103. The third sealing end surface 1031 is provided with a first gas-conducting groove 12, a second gas-conducting groove 43, and an oxygen-conducting hole 32. A nitrogen-exhausting hole 42 is provided within the second gas-conducting groove 43. Both the oxygen-conducting hole 32 and the nitrogen-exhausting hole 42 extend through the fourth sealing end surface 1032.

[0046] like Figure 5 During the rotation of the movable die 102, the first air guide groove 12 is always connected with the first air guide ring groove 11, and is intermittently connected with the air guide column hole 21, so as to realize the non-stop air supply of the compressor and the intermittent air supply to the molecular sieve or the intermittent air supply to different sieve cylinders of the molecular sieve.

[0047] like Figure 5 During the rotation of the movable die 102, the second air-guiding groove 43 intermittently communicates with the air-guiding column hole 42, while the nitrogen-exhausting movable die 42 is always connected to the nitrogen-exhausting fixed hole 41. This allows nitrogen to be exhausted from the connected molecular sieve or a separate sieve cylinder through the air-guiding column hole 42 connected to the second air-guiding groove 43 when the compressor is not operating. Alternatively, during normal oxygen production and supply, nitrogen is exhausted from the sieve cylinder connected to the second air-guiding groove 43 and the air-guiding column hole 42.

[0048] like Figure 5 , during the rotation of the movable die 102: the oxygen-conducting movable hole 32 is always connected to the second air-conducting ring groove 31, and is intermittently connected to the oxygen-conducting fixed hole 33. The oxygen prepared in the molecular sieve is intermittently discharged through the oxygen-conducting fixed hole 33, the oxygen-conducting movable hole 32 and the oxygen outlet 3, or the oxygen in different sieve cylinders in the molecular sieve is intermittently discharged. In this way, on the one hand, intermittent oxygen discharge and supply are achieved, and the rotation rhythm and speed of the movable die 102 can be adjusted to conform to the breathing frequency or required breathing frequency of the oxygen inhaler, which is ergonomic. On the other hand, through intermittent oxygen discharge and supply, the oxygen flow and pressure in the molecular sieve are sufficient, so that the oxygen prepared by the molecular sieve is sufficient, ensuring the single oxygen inhalation amount.

[0049] like Figure 6 As shown, the movable mold piece 103, the first fixed mold piece 101 and the second fixed mold piece 102 are all cylindrical and coaxially arranged. Figure 10 As shown, the first air guide ring groove 11 and the second air guide ring groove 31 are coaxial and are coaxially arranged with the movable mold plate 102. The arrangement is reasonable and the processing is convenient.

[0050] like Figure 10As shown, six air guide column holes 21 are evenly and symmetrically arranged with the axis of the moving mold 102 as the center, and are independently connected to the air guide external interface 2. The six air guide external interfaces are respectively connected to the air inlets (branch air inlets) of the six sieve cylinders of the molecular sieve, and the air delivered by the compressor is sequentially introduced into the six sieve cylinders of the molecular sieve. During the nitrogen discharge process, the movement paths of nitrogen and air are opposite, and the nitrogen in the six sieve cylinders enters the second air guide groove 43 from the air guide column hole 21 in turn, and then is directly discharged from the nitrogen discharge fixed hole 41 and the nitrogen discharge outlet 4. In this technical solution, oxygen production and nitrogen discharge can be carried out simultaneously, and the six sieve cylinders of the molecular sieve take turns to take in air, produce oxygen and discharge nitrogen, so as to realize nitrogen discharge at normal pressure.

[0051] like Figure 11 As shown, two oxygen-conducting movable holes 32 are symmetrically arranged about the axis of the movable mold plate 102, as shown in FIG. Figure 12 As shown, six oxygen-conducting fixed holes 33 are evenly distributed symmetrically about the axis of the movable mold 102, and the six oxygen-conducting fixed holes 33 are respectively connected to the air outlets (exhaust outlets) of the six sieve cylinders of the molecular sieve. When the movable mold 102 rotates, the two oxygen-conducting movable holes 32 are intermittently connected to two of the six oxygen-conducting fixed holes 33. The two oxygen-conducting movable holes 32 and the two oxygen-conducting fixed holes in the six oxygen-conducting fixed holes 33 that are connected to the oxygen-conducting movable holes 32 are always connected, that is, in the six sieve cylinders of the molecular sieve, two symmetrical sieve cylinders form a group, with a total of three groups, and the three groups of sieve cylinders perform synchronous oxygen conduction and oxygen supply in turn. In the two groups of sieve cylinders that did not participate in oxygen supply and conduction this time, the two sieve cylinders in one group were respectively performing air intake and nitrogen exhaust operations, and the other group of sieve cylinders was temporarily idle and ready for the next oxygen supply. After the movable mold rotates through an angle of 60°, it will participate in the oxygen supply and exhaust operations.

[0052] like Figure 11 As shown, the first air guide groove 12 includes a semi-annular groove 121 opposite to and connected to the first air guide ring groove 11, and a first rectangular groove 122 connected to the semi-annular groove 121. The design of the structure of the semi-annular groove 121 and the first rectangular groove 122 in the first air guide groove 12 ensures that the first rectangular groove 122 and the six air guide column holes 21 are intermittently connected during the rotation of the movable mold plate 102. During one rotation of the movable mold plate, the six sieve cylinders of the molecular sieve are sequentially supplied with air.

[0053] like Figure 11 As shown, the second air guide groove 43 is a second rectangular groove symmetrically arranged with the first rectangular groove 122 and is not connected with the semi-annular groove 121. During the rotation of the movable die, the second rectangular groove 43 is intermittently connected with the six air guide column holes in sequence. During one rotation of the movable die, the six sieve cylinders of the molecular sieve are sequentially exhausted with nitrogen, so that the molecular sieve always remains active and maintains high-efficiency filtration performance.

[0054] like Figure 11 and Figure 12As shown, the nitrogen discharge fixed hole 41 is set at the center of the second fixed die plate 102, and the nitrogen discharge movable hole 42 passes through the center of the fourth sealing end surface 1032. When the movable die plate 102 rotates, the nitrogen discharge movable hole 42 is always connected with the nitrogen discharge fixed hole 41. The nitrogen discharge outlet 4 on the nitrogen discharge fixed hole 41 is connected to a negative pressure machine. The negative pressure machine works continuously. When the second air guide groove 43 is connected to a molecular sieve cylinder, the nitrogen in the molecular sieve cylinder is extracted to realize the nitrogen discharge operation.

[0055] Based on the above technical solution, Figure 13 As shown, this is the gas flow diagram in the rotary valve of this technical solution. Figure 13 In the figure, the solid arrows indicate the oxygen production route. First, air (mainly oxygen and nitrogen) enters through the air inlet on the first die, then passes through the movable die and the first diaphragm and is discharged to the molecular sieve through one of the six air guide external interfaces 2 on the first diaphragm; after the air enters the molecular sieve, the oxygen passes through the molecular sieve and enters the movable die through the oxygen guide fixed hole 33 on the second fixed die, then enters the second air guide ring groove 31 on the first fixed die through the movable die, and finally discharges the oxygen to the oxygen intake position due to the oxygen outlet 3 connected to the second air guide ring groove 31. The hollow arrows indicate the nitrogen exhaust route. First, the second air guide groove 43 on the movable die is connected to the molecular sieve cylinder through one of the six air guide external interfaces 2 on the first diaphragm. The nitrogen in this molecular sieve cylinder is then discharged in the opposite direction and discharged through the nitrogen exhaust outlet 4 on the second fixed die.

[0056] like Figure 11 As shown, the center of the third sealing end surface 1031 is provided with a flat shaft hole 202 connected to the drive shaft, as shown in FIG. Figure 9 The center of the first fixed die plate 101 is provided with a cylindrical hole 201, which has an inner diameter larger than the outer diameter of the drive shaft and is provided for the drive shaft to pass through. A servo motor 200 is mounted on the outer end of the first fixed die plate 101. The servo motor shaft passes through cylindrical hole 201 and is fixedly connected to the flat shaft hole 202. When the servo motor is operating, it drives the movable die plate 103 to rotate. The flat shaft hole 202 provides an interference fit for installation, making it simple to install.

[0057] In this technical solution, if Figure 1 and Figure 5 As shown, the rotary valve also includes a valve body mounting frame 3, which includes a first mounting ring plate 301 arranged parallel to each other for fixing the servo motor 200, a third mounting ring plate 302 for fixing the molecular sieve, and a second mounting ring plate 303 arranged between the first mounting plate 301 and the third mounting ring plate 302.

[0058] The first mounting ring plate 301 and the second mounting ring plate 303 are fixedly connected, and the second mounting ring plate 303 and the third mounting ring plate 302 are connected by a connecting screw 304. The distance between the second mounting ring plate 303 and the third mounting ring plate 302 is adjustable, which is convenient for setting different positions of the sorting screen according to different valve body sizes.

[0059] The first fixed die plate 101, the movable die plate 103, and the second fixed die plate 102 are sequentially arranged between the second mounting ring plate 303 and the third mounting ring plate 302. The second fixed die plate 102 is fixedly mounted to the third mounting ring plate 302 on the end surface facing away from the movable die plate 103 and is connected to a hexa-molecular sieve connector 401. A coil spring 305 is fixed to the side of the first mounting ring plate 301 facing the second mounting ring plate 303. The other end of the coil spring 305 rests against the end surface of the first fixed die plate 101 facing away from the movable die plate 103. The provision of the coil spring 305 secures the first fixed die plate 101 against the movable die plate. The movable die plate is then secured to the second fixed die plate via the motor shaft of the servo motor. This achieves automatic sealing between the four sealing end surfaces, eliminating the problem of mechanical fixing or compression causing the seal to be too tight, making it difficult for the movable die plate to rotate, or the problem of wear caused by a small gap between the two sealing end surfaces.

[0060] The rotary valve of the technical solution of the present invention is easy to process, has low processing difficulty, low cost, high processing efficiency, good yield rate, low failure rate during use, and at the same time, the oxygen concentrator using the rotary valve has low cost and long service life. By using the rotary valve of the present technical solution, under the drive of the servo motor, the air holes on the rotary valve are continuously switched, so that the oxygen concentrator continuously switches the air holes during the rotation of the rotary valve, and the molecular sieve alternates between pressurized adsorption and decompression regeneration, continuously realizing the switching of nitrogen and oxygen output in the oxygen concentrator. The 6-sieve cylinder design of the molecular sieve provides more time for oxygen separation, a large amount of separated oxygen, and more efficient separation. At the same time, the nitrogen is fully absorbed, and the separated oxygen has a higher purity.

[0061] The present technical solution also provides a high-efficiency oxygen concentrator, which includes an air compressor, a molecular sieve, the aforementioned rotary valve, and a servo motor 200 for driving the movable die of the rotary valve to rotate.

[0062] The air compressor compresses the air and delivers it to the molecular sieve through the air inlet of the rotary valve. The molecular sieve separates and outputs the oxygen and delivers it to the oxygen-using position through the oxygen outlet of the rotary valve. When the compressor is not working, the nitrogen in the molecular sieve is reversely delivered to the second air guide groove in the rotary valve through the air inlet of the rotary valve and discharged through the nitrogen discharge hole and the nitrogen discharge outlet.

[0063] The servo motor 200 is mounted on the side of the first mounting ring plate 301 away from the second mounting ring plate 303, and the motor shaft of the servo motor 200 passes through the coil spring 305 and the column hole 201 on the first fixed mold plate 101 in sequence, and then extends to the movable mold plate 103, and is interference fit with the flat shaft hole 202 set on the third sealing end surface 1031 of the movable mold plate 103 to achieve a fixed connection.

[0064] The molecular sieve is fixed on the side of the third mounting ring plate 302 away from the second mounting ring plate 303, and the molecular sieve includes six sieve cylinders, each of which is respectively provided with an air inlet and an air outlet. The six air inlets and the six air outlets are respectively connected to the six air guide external interfaces 2 on the first fixed mold piece 101 and the six molecular sieve joints 401 on the second fixed mold piece 102.

[0065] The compressor is installed outside the rotary valve, and the compressor outlet is connected to the air inlet 1 on the first fixed die 101; the nitrogen exhaust outlet 4 on the second fixed die 102 is connected to a negative pressure machine installed outside the rotary valve.

[0066] The present invention provides a high-efficiency oxygen concentrator that, by adopting the aforementioned rotary valve, has good oxygen production efficiency, low failure rate, low cost, and long service life. By adopting the rotary valve of the present invention, driven by a servo motor, the air holes on the rotary valve are continuously switched. During the switching, the molecular sieve alternates between pressurized adsorption and decompression regeneration, continuously switching the output of nitrogen and oxygen in the oxygen concentrator. The 6-sieve cylinder design of the molecular sieve provides more time for oxygen separation, a large amount of separated oxygen, and more efficient separation. At the same time, the nitrogen is fully absorbed, and the separated oxygen has a higher purity.

[0067] The technical solution of the present invention is described above in conjunction with the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-mentioned method. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the invention are directly applied to other occasions without improvement, they are all within the scope of protection of the present invention.

Claims

1. A rotary valve for an oxygen concentrator, characterized in that: The valve body comprises a cylindrical movable die and a first fixed die and a second fixed die respectively provided at both ends of the movable die, wherein the end surfaces of the first fixed die and the second fixed die facing the movable die are respectively a first sealing end surface and a second sealing end surface, and the end surfaces of the movable die are respectively a third sealing end surface and a fourth sealing end surface, which are sealed with the first sealing end surface and the second sealing end surface respectively; The first sealing end surface is provided with a first air-guiding annular groove connected to an air inlet, and a second air-guiding annular groove connected to an oxygen outlet is provided outside the first air-guiding annular groove; the first sealing end surface is also provided with an air-guiding column hole connected to an air-guiding external interface, the air-guiding column hole is provided between the first air-guiding annular groove and the second air-guiding annular groove, and the air-guiding external interface is connected to a molecular sieve air inlet; The second sealing end surface is provided with an oxygen guide hole connected to the molecular sieve outlet and a nitrogen exhaust hole connected to the nitrogen exhaust outlet; The third sealing end surface is provided with a first gas guide groove, a second gas guide groove and an oxygen guide hole, the second gas guide groove is provided with a nitrogen discharge hole, and the oxygen guide hole and the nitrogen discharge hole are both passed through the fourth sealing end surface; During the rotation of the movable mold: the first air guide groove is always connected to the first air guide ring groove, and is intermittently connected to the air guide column hole; the second air guide groove is intermittently connected to the air guide column hole; the oxygen guide movable hole is always connected to the second air guide ring groove, and is intermittently connected to the oxygen guide fixed hole; the nitrogen exhaust movable hole is always connected to the nitrogen exhaust fixed hole.

2. A rotary valve for an oxygen concentrator according to claim 1, characterized in that: The movable die piece, the first fixed die piece and the second fixed die piece are all cylindrical and coaxially arranged; the first air guide ring groove and the second air guide ring groove are coaxially arranged and coaxially arranged with the movable die piece.

3. A rotary valve for an oxygen concentrator according to claim 1 or 2, characterized in that: The six air guide column holes are evenly and symmetrically arranged around the axis of the movable die and are independently connected to an air guide external interface.

4. A rotary valve for an oxygen concentrator according to claim 1 or 2, characterized in that: There are two oxygen-conducting movable holes symmetrically arranged about the axis of the movable mold, and six oxygen-conducting fixed holes symmetrically and evenly arranged about the axis of the movable mold; when the movable mold rotates, the two oxygen-conducting movable holes are intermittently connected with two of the six oxygen-conducting fixed holes.

5. The rotary valve for oxygen concentrator according to claim 3, characterized in that: The first air guide groove includes a semi-annular groove opposite to and connected to the first air guide ring groove and a first rectangular groove connected to the semi-annular groove; when the movable mold rotates, the first rectangular groove is intermittently connected to the six air guide column holes.

6. The rotary valve for oxygen concentrator according to claim 5, characterized in that: The second air guide groove is a second rectangular groove symmetrically arranged with the first rectangular groove and not connected with the semi-annular groove. When the movable die rotates, the second rectangular groove is intermittently connected with the six air guide column holes.

7. The rotary valve for oxygen concentrator according to claim 1, characterized in that: The nitrogen discharge fixed hole is set at the center of the second fixed die piece, and the nitrogen discharge movable hole passes through the center of the fourth sealing end surface. When the movable die piece rotates, the nitrogen discharge movable hole is always connected with the nitrogen discharge fixed hole.

8. The rotary valve for oxygen concentrator according to claim 1, characterized in that: The center of the third sealing end surface is provided with a flat shaft hole connected to the drive shaft, and the center of the first fixed die is provided with a column hole for the drive shaft to pass through and the inner diameter of the column hole is larger than the outer diameter of the drive shaft; The rotary valve further includes a valve body mounting frame, the valve body mounting frame including a first mounting ring plate for fixing the servo motor, a third mounting ring plate for fixing the molecular sieve, and a second mounting ring plate arranged parallel to each other; The first mounting ring plate and the second mounting ring plate are fixedly connected, and the second mounting ring plate and the third mounting ring plate are connected by connecting screws; The first fixed die plate, the movable die plate and the second fixed die plate are sequentially arranged between the second mounting ring plate and the third mounting ring plate; the second fixed die plate is away from the end face of the movable die plate, is fixedly mounted on the third mounting ring plate, and is connected with a hexa-molecular sieve connector; a coil spring is fixed on the side of the first mounting ring plate facing the second mounting ring plate, and the other end of the coil spring presses against the end face of the first fixed die plate away from the movable die plate.

9. A high-efficiency oxygen concentrator, characterized in that: comprising an air compressor, a molecular sieve, the rotary valve according to claim 8, and a servo motor for driving the movable die of the rotary valve to rotate; The air compressor compresses air and delivers it to the molecular sieve through the air inlet of the rotary valve. The molecular sieve separates and outputs oxygen, and delivers it to the oxygen-using position through the oxygen outlet of the rotary valve. When the compressor is not working, the nitrogen in the molecular sieve is reversely delivered to the second air guide groove in the rotary valve through the air inlet of the rotary valve, and is discharged through the nitrogen exhaust hole and the nitrogen exhaust outlet.

10. A high-efficiency oxygen concentrator according to claim 9, characterized in that: The servo motor is mounted on a side of the first mounting ring plate away from the second mounting ring plate, and the motor shaft of the servo motor passes through the coil spring and the column hole on the first fixed die plate in sequence, and then extends to the movable die plate, and is interference-fitted with the flat shaft hole provided on the third sealing end surface of the movable die plate; The molecular sieve is fixed on the side of the third mounting ring plate away from the second mounting ring plate, and the molecular sieve includes six sieve cylinders, each of which is provided with an air inlet and an air outlet, and the six air inlets and six air outlets are respectively connected to the six air guide external interfaces on the first fixed die piece and the six molecular sieve connectors on the second fixed die piece; The compressor is installed outside the rotary valve, and the outlet of the compressor is connected to the air inlet on the first fixed die; the nitrogen exhaust outlet on the second fixed die is connected to a negative pressure machine installed outside the rotary valve.

Images