Airflow switching rotary valve and oxygen generator

Abstract

This application belongs to the technical field of medical devices and discloses an airflow switching rotary valve and an oxygen generator. The airflow switching rotary valve includes a mounting base and a moving valve core. The mounting base has a distribution chamber and an air inlet communicating with the distribution chamber. The moving valve core is located inside the distribution chamber and has a moving plate sealing surface. The moving plate sealing surface is provided with an exhaust chamber. The moving valve core is provided with an air inlet channel located on the side of the exhaust chamber. The outer peripheral surface of the moving valve core is provided with multiple contact positions. The contact positions contact the cavity wall of the distribution chamber to restrict the relative movement of the moving valve core with the mounting base in its own radial direction and to restrict the deflection of the moving valve core in its own axial direction. This ensures the sealing performance between the moving valve core and the stationary valve core and reduces the manufacturing cost of the airflow switching rotary valve.

Description

Technical Field

[0001] This application belongs to the technical field of medical devices, specifically relating to an airflow switching rotary valve and an oxygen generator. Background Technology

[0002] An oxygen concentrator is a medical device that separates oxygen from the air to provide high-concentration oxygen to patients requiring oxygen therapy. Currently, most oxygen concentrators on the market employ a design where two molecular sieve adsorption towers work alternately. That is, while one adsorption tower adsorbs nitrogen components from high-pressure air, the other adsorption tower is in a molecular sieve desorption and regeneration state, discharging waste nitrogen. Therefore, the gas path needs to be periodically switched. Airflow switching rotary valves, as airflow switching components, are commonly used in oxygen concentrators to control the switching of the gas path.

[0003] Existing airflow switching rotary valves typically include a valve body and a motor located within the valve body. The valve body contains a distribution chamber, a moving valve core located within the distribution chamber, and a stationary valve core in contact with the moving valve core. The motor drives the moving valve core to rotate. The stationary valve core has a central hole and two eccentric holes spaced circumferentially along the central hole. The moving valve core has an intake channel and an exhaust channel. The two ends of the intake channel are connected to the distribution chamber and one of the eccentric holes, respectively, and the exhaust channel is connected to the central hole and the other eccentric hole. When the moving valve core rotates relative to the stationary valve core under the action of the motor, it can connect the intake channel and the exhaust channel with different eccentric holes to achieve the switching of the air path.

[0004] Currently, there are two common methods for forming the air intake channel. One method involves a notch on the outer periphery of the moving valve core, allowing the notch to form an air intake channel together with the wall of the distribution chamber. However, this notch reduces the contact area between the moving valve core and the distribution chamber. Furthermore, the motor's operation generates vibration, causing the entire valve body to vibrate. Simultaneously, the moving valve core is impacted by high-speed airflow during rotation, leading to vibration and eccentricity issues. This affects the seal between the moving and stationary valve cores, resulting in mixing of the intake and exhaust nitrogen in the adsorption tower, ultimately impacting the oxygen concentration of the oxygen generator's output gas. Another type features a perforated structure on the moving valve core, extending through its thickness. This perforated structure forms an intake channel, ensuring sufficient contact area between the outer periphery of the moving valve core and the distribution chamber. However, the exhaust channel at the top is formed by a connecting hole and two grooves, one corresponding to the central hole and the other to one of the eccentric holes. The connecting hole is located inside the moving valve core and connects the two grooves. This increases the manufacturing difficulty of the moving valve core, thereby raising the production cost of the airflow switching rotary valve. Therefore, reducing the production cost of the airflow switching valve while ensuring the sealing between the moving and stationary valve cores has become an urgent technical problem to be solved. Utility Model Content

[0005] This application provides an airflow switching rotary valve to ensure the sealing between the moving valve core and the stationary valve core, thereby reducing the manufacturing cost of the airflow switching rotary valve.

[0006] The technical solution adopted in this application is as follows:

[0007] An airflow switching rotary valve, comprising:

[0008] Mounting base, the mounting base having a dispensing cavity and an air inlet communicating with the dispensing cavity;

[0009] The moving valve core is located inside the distribution cavity. The moving valve core has a moving plate sealing surface, and the moving plate sealing surface is provided with an exhaust cavity. The moving valve core is provided with an air intake channel located on the side of the exhaust cavity. The outer peripheral surface of the moving valve core is provided with multiple contact positions. The contact positions contact the cavity wall of the distribution cavity to restrict the relative movement of the moving valve core with the mounting base in its own radial direction and to restrict the deflection of the moving valve core in its own axial direction.

[0010] By adopting the above technical solution, when the airflow switching rotary valve in this application switches the air path, the moving valve core rotates so that the moving valve core rotates relative to the stationary valve core and the distribution chamber, thereby realizing the position adjustment of the moving valve core so that the exhaust chamber and the intake passage are respectively connected to different eccentric holes on the stationary valve core, thereby realizing the airflow switching rotary valve to switch the air path.

[0011] Because the outer circumferential surface of the moving valve core is provided with multiple contact positions, and these contact positions contact the cavity wall of the distribution chamber, the moving valve core can be limited by the contact positions and the cavity wall of the distribution chamber. This prevents the moving valve core from moving relative to the stationary valve core in its radial direction or from deflecting in its axial direction due to the impact of high-speed airflow and motor vibration during rotation. This ensures that the moving valve core and the stationary valve core are in a coaxial state, and also avoids relative vibration between the moving valve core and the mounting cavity and the stationary valve core. This increases the stability of the moving valve core, ensuring the sealing between the moving plate sealing surface and the stationary plate sealing surface, and thus ensuring the oxygen concentration of the gas produced by the oxygen concentrator equipped with the airflow switching rotary valve of this application, thereby ensuring the oxygen therapy effect of the oxygen concentrator on the patient.

[0012] Because the moving valve core is equipped with an exhaust chamber, it is possible to connect the central hole and part of the eccentric hole on the stationary valve core using a cavity, thereby simplifying the structural design of the moving valve core, reducing the manufacturing difficulty and cost of the moving valve core, and consequently reducing the manufacturing cost of the airflow switching rotary valve.

[0013] Optionally, the outer peripheral surface of the moving valve core is circular, so that any position on the outer peripheral surface of the moving valve core can form the contact position.

[0014] By adopting the above technical solution, since the outer circumferential surface of the moving valve core is circular, the entire outer circumferential surface of the moving valve core can contact the cavity wall of the distribution chamber, thereby increasing the contact area between the moving valve core and the distribution chamber. This increases the stability between the moving valve core and the distribution chamber, further preventing the moving valve core from moving radially or deflecting axially due to the impact of high-speed airflow and motor vibration during rotation. It also prevents relative vibration between the moving valve core and the distribution chamber and the stationary valve core, further ensuring the sealing performance between the moving plate sealing surface and the stationary plate sealing surface. This further prevents the mixing of the inlet gas and the outlet nitrogen gas of the adsorption tower, and further ensures the oxygen content of the gas produced by the oxygen generator equipped with the airflow switching rotary valve of this application.

[0015] Optionally, the airflow switching rotary valve further includes a stationary valve core, which has a central hole and at least two eccentric holes. The plurality of eccentric holes are spaced apart circumferentially along the central hole. The air intake channel includes an air intake chamber that can communicate with some of the eccentric holes and an air intake groove that communicates with the distribution chamber. The air intake groove extends circumferentially along the moving valve core.

[0016] By adopting the above technical solution, since the intake channel includes an intake chamber and an intake groove extending circumferentially along the moving valve core, the volume of the intake channel and the communication area with the distribution chamber are increased, thereby increasing the smoothness of the gas in the distribution chamber entering the intake channel and thus improving the intake efficiency of the intake channel.

[0017] Optionally, the mounting base has a shaft hole communicating with the distribution chamber, and the airflow switching rotary valve further includes a drive shaft passing through the shaft hole. The end face of the moving valve core away from the stationary valve core is provided with multiple limiting ribs at intervals along the circumference of the drive shaft. The inner side of each limiting rib abuts against the outer circumferential surface of the drive shaft. A transmission notch is formed between two adjacent limiting ribs. At least one transmission block located in the transmission notch is provided on the side of the drive shaft.

[0018] By adopting the above technical solution, the inner side of the limiting rib abuts against the outer circumferential surface of the transmission shaft, and a transmission gap is formed between two adjacent limiting ribs. The transmission block on the side of the transmission shaft is located in the transmission gap. Thus, on the one hand, the cooperation between the limiting rib and the transmission shaft can limit the movement of the valve core, so as to further prevent the movement of the valve core from deviating along its own axial direction and moving along its own radial direction, thereby further increasing the stability of the movement of the valve core and further ensuring the sealing performance between the stationary plate sealing surface and the moving plate sealing surface. On the other hand, the cooperation between the transmission gap formed between two adjacent limiting ribs and the transmission block can enable the movement of the valve core to rotate with the transmission shaft, thereby increasing the flexibility of the limiting rib.

[0019] In addition, since the drive shaft passes through the shaft hole, the shaft hole can limit the drive shaft to increase its stability, thereby further increasing the limiting effect of the drive shaft on the moving valve core through the limiting rib, and further increasing the stability of the moving valve core.

[0020] Optionally, each of the limiting ribs is provided with a reinforcing rib on its outer side. The reinforcing rib is fixedly connected to the end face of the moving valve core away from the stationary valve core and extends outward from the limiting rib.

[0021] By adopting the above technical solution, since the reinforcing rib is fixedly connected to the end face of the moving valve core away from the stationary valve core and extends outward from the limiting rib, the structural strength of the moving valve core can be increased by the reinforcing rib to ensure the service life of the moving valve core, thereby extending the service life of the airflow switching rotary valve. At the same time, the structural strength of the limiting rib can also be increased by the reinforcing rib to increase the limiting effect of the limiting rib on the moving valve core, thereby further increasing the stability of the moving valve core.

[0022] Optionally, the drive shaft is provided with a stop rib that cooperates with the cavity wall stop of the distribution cavity, and the end of the drive shaft near the moving valve core is provided with a mounting cavity. The moving valve core is provided with a guide portion that extends into the mounting cavity, and an elastic element located in the mounting cavity is sleeved on the outside of the guide portion. The elastic element is used to apply an elastic force to the moving valve core in the direction of the stationary valve core.

[0023] By adopting the above technical solution, since the elastic element applies an elastic force to the moving valve core in the direction of the stationary valve core, the clamping force between the moving and stationary sealing surfaces is increased, thereby further enhancing the sealing performance between the moving and stationary sealing surfaces. Since the elastic element is sleeved outside the guide portion and located in the mounting cavity, the mounting cavity and guide portion can be used to position and guide the elastic element, increasing its stability and ensuring that the elastic force applied by the elastic element to the moving valve core further enhances the sealing performance between the moving and stationary sealing surfaces. Since the drive shaft is provided with a stop rib that cooperates with the cavity wall stop of the distribution cavity, the stop rib can be used to limit the movement of the drive shaft, increasing its stability and thus increasing the stability of the elastic element, further enhancing the sealing performance between the moving and stationary sealing surfaces.

[0024] Optionally, the distribution cavity is provided with an annular rib surrounding the shaft hole, and the stop rib abuts against the bottom of the annular rib.

[0025] By adopting the above technical solution, the annular ribs surrounding the shaft hole increase the contact area between the drive shaft and the mounting base, thereby increasing the stability of the drive shaft. This improves the limiting effect of the contact fit between the drive shaft and the limiting ribs on the moving valve core, further increasing the stability of the moving valve core. Simultaneously, the increased contact area between the drive shaft and the mounting base also enhances the sealing between the drive shaft and the distribution chamber, preventing gas leakage through the gap between the drive shaft and the shaft hole. This allows more gas to enter the intake channel, improving the gas production efficiency of the oxygen concentrator equipped with the airflow switching rotary valve of this application. Furthermore, it avoids noise caused by gas leakage through the gap between the drive shaft and the shaft hole in the distribution chamber, reducing the noise during operation of the airflow switching rotary valve and improving the product quality of the oxygen concentrator equipped with the airflow switching rotary valve of this application.

[0026] Optionally, the outer periphery of the drive shaft is provided with an annular groove, and a first sealing ring is provided in the annular groove, the first sealing ring contacting the wall of the shaft hole.

[0027] By adopting the above technical solution, since the first sealing ring contacts the hole wall of the shaft hole, the sealing between the transmission shaft and the shaft hole is further increased, so that more gas in the distribution chamber can enter the air intake channel, thereby further improving the gas production efficiency of the oxygen generator equipped with the airflow switching rotary valve of this application; at the same time, the noise generated when the airflow switching rotary valve is working is further reduced, thereby further improving the product quality of the oxygen generator equipped with the airflow switching rotary valve of this application.

[0028] Furthermore, since the first sealing ring is set in the annular groove, the groove wall can be used to limit the first sealing ring, thereby increasing the connection stability between the first sealing ring and the drive shaft. On the other hand, it can increase the sealing performance between the first sealing ring and the drive shaft, thereby further increasing the sealing performance between the drive shaft and the shaft hole.

[0029] Optionally, the airflow switching rotary valve further includes a stationary valve core and a valve seat. The stationary valve core is provided with a central hole and at least two eccentric holes. The valve seat has a receiving cavity, and the stationary valve core is disposed inside the receiving cavity. The valve seat is provided with a central airflow hole communicating with the central hole and an eccentric airflow hole communicating with the eccentric holes. One of the stationary valve core and the valve seat is provided with a limiting part, and the other of the two is provided with a mating part for receiving the limiting part.

[0030] By adopting the above technical solution, since one of the stationary valve core and the valve seat is provided with a limiting part, and the other of the two is provided with a mating part to accommodate the limiting part, the limiting part and the mating part can be used to limit the stationary valve core, so as to avoid the situation that the stationary valve core may rotate with the moving valve core when the moving valve core rotates, thereby ensuring the working stability of the airflow switching rotary valve.

[0031] Optionally, the valve seat is provided with a receiving groove surrounding the central airflow hole and the eccentric airflow hole, and a second sealing ring is provided in the receiving groove. The second sealing ring contacts the end face of the stationary valve core away from the moving valve core.

[0032] By adopting the above technical solution, since the second sealing ring contacts the end face of the stationary valve core away from the moving valve core, it increases the sealing between the stationary valve core and the valve seat to avoid possible air leakage between the stationary valve core and the valve seat, thereby increasing the gas production efficiency of the oxygen generator equipped with the airflow switching rotary valve of this application. On the other hand, it can also use the second sealing ring to apply an elastic force to the stationary valve core toward the side where the moving valve core is located, thereby increasing the clamping force between the valve core and the moving valve core, and further increasing the sealing between the stationary sealing surface and the moving sealing surface.

[0033] Furthermore, since the second sealing ring is located in the receiving groove, it increases the connection stability between the second sealing ring and the valve seat, thereby ensuring the sealing effect of the second sealing ring between the stationary valve core and the valve seat. On the other hand, it increases the contact area between the second sealing ring and the valve seat, which further enhances the sealing effect of the second sealing ring between the stationary valve core and the valve seat.

[0034] Optionally, one of the mounting base and the valve seat is provided with a sealing groove, and a third sealing ring is provided in the sealing groove, the third sealing ring contacting the other one.

[0035] By adopting the above technical solution, since one of the mounting base and the valve seat is provided with a sealing groove, and a third sealing ring is provided in the sealing groove, and the third sealing ring contacts the other one, the sealing performance between the mounting base and the valve seat is increased on the one hand to avoid possible air leakage between the mounting base and the valve seat. On the other hand, the stability of the third sealing ring is increased to ensure the sealing effect of the third sealing ring between the mounting base and the valve seat. Furthermore, the sealing groove can be used to limit the position of the third sealing ring to prevent displacement of the third sealing ring when the mounting base and the valve seat are assembled together, thereby reducing the difficulty of assembling the mounting base and the valve seat together and improving the production efficiency of the airflow switching rotary valve.

[0036] Optionally, one of the valve seat and the mounting base is provided with a positioning part, and the other of the two is provided with a receiving part for accommodating the positioning part.

[0037] By adopting the above technical solution, since one of the valve seat and the mounting seat is provided with a positioning part and the other is provided with a receiving part to accommodate the positioning part, the mounting seat and the valve seat can be positioned by the cooperation of the positioning part and the receiving part, so as to facilitate the subsequent fixed connection of the mounting seat and the valve seat together, thereby improving the efficiency of assembling the mounting seat and the valve seat together, and further improving the production efficiency of the airflow switching rotary valve.

[0038] This application also discloses an oxygen generator to ensure the oxygen concentration of the gas produced by the oxygen generator and reduce the manufacturing cost of the oxygen generator.

[0039] An oxygen generator includes an airflow switching rotary valve as described above.

[0040] By adopting the above technical solution, the oxygen concentrator in this application uses the aforementioned airflow switching rotary valve, thereby increasing the sealing performance between the stationary plate sealing surface and the moving plate sealing surface. This prevents the possible mixing of the inlet air and the outlet nitrogen gas in the adsorption tower, ensuring the oxygen concentration of the gas produced by the oxygen concentrator and thus improving the oxygen therapy effect on patients. At the same time, the structural design of the moving valve core is simplified, thereby reducing the manufacturing cost of the airflow switching rotary valve and consequently reducing the manufacturing cost of the oxygen concentrator.

[0041] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0042] 1. The airflow switching rotary valve of this application includes a mounting base and a moving valve core. The mounting base has a distribution chamber and an air inlet communicating with the distribution chamber. The moving valve core is disposed inside the distribution chamber and has a moving plate sealing surface. The moving plate sealing surface is provided with an exhaust chamber. The moving valve core is provided with an air inlet channel located on the side of the exhaust chamber. The outer peripheral surface of the moving valve core is provided with multiple contact positions. The contact positions contact the cavity wall of the distribution chamber to limit the relative movement of the moving valve core with the mounting base in its radial direction and to limit the axial deviation of the moving valve core, so as to avoid the moving valve core from being damaged during rotation. The impact of high-speed airflow and motor vibration cause the moving valve core to move relative to the stationary valve core in its radial direction and to deflect in its axial direction. This ensures that the moving and stationary valve cores are coaxial and prevents relative vibration between the moving valve core and the mounting cavity and the stationary valve core. This increases the stability of the moving valve core and ensures the sealing between the moving and stationary sealing surfaces. Consequently, it ensures the oxygen concentration of the gas produced by the oxygen concentrator equipped with the airflow switching rotary valve of this application, thus ensuring the oxygen therapy effect of the oxygen concentrator on the patient.

[0043] 2. The outer circumferential surface of the moving valve core in this application is circular, so that any position on the outer circumferential surface of the moving valve core can form a contact position, thereby allowing the entire outer circumferential surface of the moving valve core to contact the cavity wall of the distribution chamber. This increases the contact area between the moving valve core and the distribution chamber, thereby increasing the stability between the moving valve core and the distribution chamber. This further prevents the moving valve core from moving radially or deflecting axially due to the impact of high-speed airflow and motor vibration during rotation. It also prevents relative vibration between the moving valve core and the distribution chamber and the stationary valve core, further ensuring the sealing performance between the moving plate sealing surface and the stationary plate sealing surface. This further prevents the mixing of the inlet gas and the outlet nitrogen gas of the adsorption tower, and further ensures the oxygen content of the gas produced by the oxygen generator equipped with the airflow switching rotary valve of this application.

[0044] 3. The airflow switching rotary valve in this application also includes a stationary valve core, which is provided with a central hole and at least two eccentric holes. The multiple eccentric holes are arranged at intervals along the circumference of the central hole. The air intake channel includes an air intake chamber that can communicate with some of the eccentric holes and an air intake groove that communicates with the distribution chamber. The air intake groove extends along the circumference of the moving valve core, thereby increasing the volume of the air intake channel and the communication area with the distribution chamber, thereby increasing the smoothness of the gas in the distribution chamber entering the air intake channel, and thus improving the air intake efficiency of the air intake channel. Attached Figure Description

[0045] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments of this application and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0046] Figure 1 This is a schematic diagram of the airflow switching rotary valve in one embodiment of this application;

[0047] Figure 2 This is an exploded schematic diagram of the airflow switching rotary valve described in one embodiment of this application;

[0048] Figure 3 This is a cross-sectional view of the airflow switching rotary valve described in one embodiment of this application;

[0049] Figure 4 This is a schematic diagram of the structure of the mounting base according to one embodiment of this application;

[0050] Figure 5 This is a schematic diagram of the connection structure between the moving valve core and the mounting base in one embodiment of this application;

[0051] Figure 6 This is a schematic diagram of the static valve core described in one embodiment of this application;

[0052] Figure 7 This is a schematic diagram of the structure of the moving valve core according to one embodiment of this application;

[0053] Figure 8 This is a schematic diagram of the moving valve core from another perspective in one embodiment of this application;

[0054] Figure 9 This is a partial structural cross-sectional view of the airflow switching rotary valve described in one embodiment of this application;

[0055] Figure 10 This is a schematic diagram of the structure of the drive shaft described in one embodiment of this application;

[0056] Figure 11 This is a schematic diagram of the valve seat structure in one embodiment of this application;

[0057] Figure 12 This is a schematic diagram of the connection structure between the static valve core and the valve seat in one embodiment of this application.

[0058] Figure label:

[0059] 1. Static valve core; 11. Static plate sealing surface; 12. Center hole; 13. Eccentric hole; 14. Mating part; 2. Mounting base; 21. Distribution chamber; 211. Air inlet; 212. Annular rib; 213. Air connector; 22. Shaft hole; 23. Positioning part; 24. Connecting column; 3. Moving valve core; 31. Moving plate sealing surface; 32. Exhaust chamber; 33. Air inlet channel; 331. Air inlet groove; 332. Air inlet cavity; 34. Limiting rib; 341. Transmission 342. Notch; 35. Reinforcing rib; 4. Guide section; 4. Drive shaft; 41. Drive block; 42. Stop rib; 43. Mounting cavity; 431. Elastic element; 44. Annular groove; 441. First sealing ring; 5. Motor; 6. Valve seat; 61. Receiving cavity; 62. Central airflow hole; 63. Eccentric airflow hole; 64. Limiting section; 65. Receiving groove; 651. Second sealing ring; 66. Sealing groove; 661. Third sealing ring; 67. Receiving section. Detailed Implementation

[0060] To more clearly illustrate the overall concept of this application, a detailed explanation is provided below with reference to the accompanying drawings.

[0061] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, this application may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0062] Furthermore, it should be understood in the description of this application that the terms "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0063] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0064] In this application, unless otherwise expressly specified and limited, the "above" or "below" of the second feature can mean that the first and second features are in direct contact, or that the first and second features are in indirect contact through an intermediate medium. In the description of this specification, references to terms such as "implementation," "example," "a particular embodiment," "example," or "specific example," etc., indicate that the specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples.

[0065] Reference Figures 1 to 12 A rotary valve for switching airflow is disclosed, comprising a mounting base 2 and a moving valve core 3. The mounting base 2 has a distribution cavity 21 and an air inlet 211 communicating with the distribution cavity 21. The moving valve core 3 is disposed inside the distribution cavity 21 and has a moving plate sealing surface 31. The moving plate sealing surface 31 is provided with an exhaust cavity 32. The moving valve core 3 is provided with an air inlet channel 33 located on the side of the exhaust cavity 32. The outer peripheral surface of the moving valve core 3 is provided with multiple contact positions. The contact positions contact the cavity wall of the distribution cavity 21 to restrict the relative movement of the moving valve core 3 with the mounting base 2 in its own radial direction and to restrict the deflection of the moving valve core 3 in its own axial direction.

[0066] It is understood that the airflow switching rotary valve also includes a stationary valve core 1, which has a stationary sealing surface 11 and is provided with a central hole 12 and at least two eccentric holes 13. The multiple eccentric holes 13 are arranged circumferentially along the central hole 12. The moving sealing surface 31 is in contact with the stationary sealing surface 11. The exhaust chamber 32 can communicate with the central hole 12 and some of the eccentric holes 13. The two ends of the intake passage 33 are respectively connected to the distribution chamber 21 and the remaining part of the eccentric holes 13.

[0067] When the airflow switching rotary valve in this application switches the air path, the moving valve core 3 rotates so that the moving valve core 3 rotates relative to the stationary valve core 1 and the distribution chamber 21, thereby realizing the position adjustment of the moving valve core 3 so that the exhaust chamber 32 and the intake passage 33 are respectively connected to different eccentric holes 13 on the stationary valve core 1, thereby realizing the switching of the air path by the airflow switching rotary valve.

[0068] Because the outer circumferential surface of the moving valve core 3 is provided with multiple contact positions, and these contact positions contact the cavity wall of the distribution cavity 21, the moving valve core 3 can be limited by the contact positions and the cavity wall of the distribution cavity 21. This prevents the moving valve core 3 from moving relative to the stationary valve core 1 in its radial direction and from deflecting in its axial direction due to the impact of high-speed airflow and the vibration of the motor 5 during rotation. This ensures that the moving valve core 3 and the stationary valve core 1 are in a coaxial state, and also avoids the relative vibration of the moving valve core 3 with the mounting cavity 43 and the stationary valve core 1. This increases the stability of the moving valve core 3, ensuring the sealing between the moving plate sealing surface 31 and the stationary plate sealing surface 11, and thus ensuring the oxygen concentration of the gas produced by the oxygen concentrator equipped with the airflow switching rotary valve of this application, thereby ensuring the oxygen therapy effect of the oxygen concentrator on the patient.

[0069] Since the exhaust chamber 32 is connected to the central hole 12 and part of the eccentric hole 13, it is realized that a cavity is connected to the central hole 12 and part of the eccentric hole 13, which simplifies the structural design of the moving valve core 3, thereby reducing the manufacturing difficulty and cost of the moving valve core 3, and thus reducing the manufacturing cost of the airflow switching rotary valve.

[0070] This application does not specifically limit the relationship between the center hole 12 and the stationary valve core 1. Preferably, refer to... Figure 6 The central axis of the central hole 12 is collinear with the central axis of the stationary valve core 1, which facilitates the layout design of the exhaust chamber 32 and the intake passage 33, thereby further reducing the manufacturing difficulty of the moving valve core 3. In other embodiments, the stationary valve core 1 has a central region and a side region surrounding the central region, and the central hole 12 is located on the side of the central region.

[0071] This application does not specifically limit the positional relationship between the multiple eccentric holes 13 and the central hole 12. Preferably, refer to... Figure 6 The distance from each eccentric hole 13 to the central hole 12 is equal, thus facilitating the layout design of the exhaust chamber 32 and the intake passage 33. In other embodiments, the distances from each eccentric hole 13 to the central hole 12 can be different.

[0072] This application does not specify the number of eccentric holes 13. Preferably, there are two eccentric holes 13, and the two eccentric holes 13 are evenly spaced along the circumference of the stationary valve core 1. That is, the line connecting the two eccentric holes 13 passes through the center of the stationary valve core 1, so that the air path can be switched when the moving valve core 3 rotates 180°. In other embodiments, three, four, or other numbers of eccentric holes 13 may also be provided.

[0073] This application does not specifically limit the formation method of the contact position. Preferably, the outer peripheral surface of the moving valve core 3 is circular, so that any position on the outer peripheral surface of the moving valve core 3 can form a contact position.

[0074] It is understandable that the cross-sectional shape of the distribution cavity 21 is circular, and the diameter of the moving valve core 3 is equal to the diameter of the distribution cavity 21.

[0075] Since the outer circumferential surface of the moving valve core 3 is circular, the entire outer circumferential surface of the moving valve core 3 can contact the cavity wall of the distribution chamber 21, thereby increasing the contact area between the moving valve core 3 and the distribution chamber 21. This increases the stability between the moving valve core 3 and the distribution chamber 21, further preventing the moving valve core 3 from moving radially or deflecting axially due to the impact of high-speed airflow and the vibration of the motor 5 during rotation. It also prevents relative vibration between the moving valve core 3, the distribution chamber 21, and the stationary valve core 1, further ensuring the sealing performance between the moving plate sealing surface 31 and the stationary plate sealing surface 11. This further prevents the mixing of the inlet and outlet nitrogen of the adsorption tower, and further ensures the oxygen content of the gas produced by the oxygen generator equipped with the airflow switching rotary valve of this application.

[0076] In other embodiments, the outer peripheral surface of the moving valve core 3 is provided with a plurality of contact ribs. The contact ribs extend along the axial direction of the moving valve core 3, and the plurality of contact ribs are evenly spaced along the circumference of the moving valve core 3, or the line connecting at least two contact ribs passes through the center of the moving valve core 3, or the extension line of the line connecting one of the contact ribs and the center of the moving valve core 3 passes through the midpoint of the line connecting the other two contact ribs.

[0077] This application does not specify the formation method of the air intake channel 33; preferably, refer to Figure 7 The airflow switching rotary valve also includes a stationary valve core 1, which is provided with a central hole 12 and at least two eccentric holes 13. The multiple eccentric holes 13 are arranged at intervals along the circumference of the central hole 12. The air intake channel 33 includes an air intake chamber 332 that can communicate with some of the eccentric holes 13 and an air intake groove 331 that communicates with the distribution chamber 21. The air intake groove 331 extends along the circumference of the moving valve core 3.

[0078] It is understandable that the intake groove 331 is located on the side of the moving valve core 3 away from the stationary valve core 1, and the intake chamber 332 is located on the side of the moving valve core 3 close to the stationary valve core 1. The intake groove 331 and the intake chamber 332 are connected and together form the intake channel 33.

[0079] Since the intake passage 33 includes an intake chamber 332 and an intake groove 331 extending circumferentially along the moving valve core 3, the volume of the intake passage 33 and the communication area with the distribution chamber 21 are increased, thereby increasing the smoothness of the gas in the distribution chamber 21 entering the intake passage 33, and thus improving the intake efficiency of the intake passage 33.

[0080] In other embodiments, the moving valve core 3 is provided with a perforated structure that penetrates the moving valve core 3 in the thickness direction, so that the perforated structure provided in the moving valve core 3 forms an air intake channel 33; or, the air intake channel 33 is formed by a notch provided between two adjacent contact positions.

[0081] In a preferred embodiment, refer to Figure 3 , Figure 4 , Figure 8 and Figure 9 The mounting base 2 has a shaft hole 22 communicating with the distribution chamber 21. The airflow switching rotary valve also includes a drive shaft 4 passing through the shaft hole 22. The end face of the moving valve core 3 facing away from the stationary valve core 1 is provided with multiple limiting ribs 34 at intervals along the circumference of the drive shaft 4. The inner side of each limiting rib 34 abuts against the outer circumferential surface of the drive shaft 4. A transmission notch 341 is formed between two adjacent limiting ribs 34. At least one transmission block 41 located in the transmission notch 341 is provided on the side of the drive shaft 4.

[0082] It is understandable that the drive shaft 4 and the moving valve core 3 are coaxially arranged; multiple limiting ribs 34 together form an accommodating space, and one end of the drive shaft 4 extends into the accommodating space so that the inner side of the limiting rib 34 can contact the outer peripheral surface of the drive shaft 4.

[0083] The inner surface of the limiting rib 34 abuts against the outer circumferential surface of the transmission shaft 4, and a transmission notch 341 is formed between two adjacent limiting ribs 34. The transmission block 41 on the side of the transmission shaft 4 is located in the transmission notch 341. Thus, on the one hand, the cooperation between the limiting rib 34 and the transmission shaft 4 can limit the moving valve core 3, so as to further prevent the moving valve core 3 from deviating along its own axial direction and moving along its own radial direction, thereby further increasing the stability of the moving valve core 3 and further ensuring the sealing between the stationary plate sealing surface 11 and the moving plate sealing surface 31. On the other hand, the cooperation between the transmission notch 341 formed between two adjacent limiting ribs 34 and the transmission block 41 can realize that the moving valve core 3 rotates with the transmission shaft 4, thereby increasing the flexibility of the limiting rib 34.

[0084] In addition, since the drive shaft 4 passes through the shaft hole 22, the shaft hole 22 can limit the drive shaft 4 to increase the stability of the drive shaft 4, thereby further increasing the limiting effect of the drive shaft 4 on the moving valve core 3 through the limiting rib 34, and further increasing the stability of the moving valve core 3.

[0085] Specifically, when the moving valve core 3 needs to rotate, the transmission shaft 4 is rotated so that the transmission shaft 4 drives the moving valve core 3 to rotate under the cooperation of the transmission block 41 and the transmission notch 341, so as to realize the rotation of the moving valve core 3.

[0086] This application does not specify the number of limiting ribs 34; preferably, refer to... Figure 8 The limiting rib 34 has two segments, both extending circumferentially along the drive shaft 4. Two transmission notches 341 are formed between the two segments to increase the contact area between the limiting rib 34 and the drive shaft 4, thereby increasing the limiting effect of the drive shaft 4 on the moving valve core 3 and further enhancing the stability of the moving valve core 3. In other embodiments, the limiting rib 34 may also have other numbers.

[0087] This application does not specify the number of transmission blocks 41. Preferably, one transmission block 41 is provided to reduce the manufacturing cost of the transmission shaft 4. In other embodiments, the number of transmission blocks 41 may also be equal to the number of transmission notches 341, so that the transmission shaft 4 is balanced in its circumferential direction.

[0088] Furthermore, refer to Figure 8 Each limiting rib 34 has a reinforcing rib 342 on its outer side. The reinforcing rib 342 is fixedly connected to the end face of the moving valve core 3 away from the stationary valve core 1 and extends outward from the limiting rib 34. The reinforcing rib 342 can increase the structural strength of the moving valve core 3 to ensure the service life of the moving valve core 3, thereby extending the service life of the airflow switching rotary valve. At the same time, the reinforcing rib 342 can also increase the structural strength of the limiting rib 34 to increase the limiting effect of the limiting rib 34 on the moving valve core 3, thereby further increasing the stability of the moving valve core 3.

[0089] Preferably, the projection of some of the reinforcing ribs 342 toward the moving valve core 3 covers the air intake groove 331, thereby increasing the structural strength of the moving valve core 3 at the air intake groove 331, thus avoiding the situation where the moving valve core 3 is easily deformed at the air intake groove 331 and affecting the stability of the moving valve core 3, and further increasing the stability of the moving valve core 3.

[0090] This application does not specifically limit the extension direction of the reinforcing rib 342. Preferably, the reinforcing rib 342 extends outward along the radial direction of the moving valve core 3 to reduce the manufacturing difficulty of the moving valve core 3 and improve the production efficiency of the moving valve core 3. In other embodiments, the extension direction of the reinforcing rib 342 may also be at an angle to the radial direction of the moving valve core 3.

[0091] Furthermore, refer to Figure 3 and Figure 9The drive shaft 4 is provided with a stop rib 42 that cooperates with the cavity wall stop of the distribution cavity 21. The end of the drive shaft 4 near the moving valve core 3 is provided with a mounting cavity 43. The moving valve core 3 is provided with a guide portion 35 that extends into the mounting cavity 43. An elastic element 431 located in the mounting cavity 43 is sleeved on the outside of the guide portion 35. The elastic element 431 is used to apply an elastic force to the moving valve core 3 in the direction of the stationary valve core 1.

[0092] Since the elastic element 431 applies an elastic force to the moving valve core 3 in the direction of the stationary valve core 1, it can increase the abutting force between the moving plate sealing surface 31 and the stationary plate sealing surface 11, thereby further increasing the sealing performance between them. Because the elastic element 431 is sleeved outside the guide portion 35 and located in the mounting cavity 43, the mounting cavity 43 and the guide portion 35 can be used to position and guide the elastic element, increasing its stability and ensuring its stability. The elastic force applied to the moving valve core 31 can further increase the sealing performance between the moving plate sealing surface 31 and the stationary plate sealing surface 11. Since the drive shaft 4 is provided with a stop rib 42 that cooperates with the cavity wall stop of the distribution cavity 21, the stop rib 42 can be used to limit the drive shaft 4 by cooperating with the cavity wall stop of the distribution cavity 21, thereby increasing the stability of the drive shaft 4 and thus increasing the stability of the elastic element 431, so as to further increase the sealing performance between the moving plate sealing surface 31 and the stationary plate sealing surface 11.

[0093] Preferably, the elastic element 431 is coaxially arranged with the moving valve core 3 so that the moving valve core 3 is subjected to balanced forces in its own circumferential direction, thereby improving the elastic pressure effect of the elastic element 431 on the moving valve core 3, and further ensuring the sealing performance between the moving plate sealing surface 31 and the stationary plate sealing surface 11.

[0094] Preferably, the stop rib 42 extends circumferentially along the drive shaft 4 to increase the contact area between the stop rib 42 and the cavity wall of the distribution cavity 21, thereby increasing the sealing between the drive shaft 4 and the distribution cavity 21.

[0095] This application does not specifically limit the structure of the guide section 35; preferably, refer to... Figure 8 The guide portion 35 is a columnar structure coaxially disposed on the moving valve core 3 to enhance the positioning and limiting effect of the elastic element 431. In other embodiments, the guide portion 35 may also be a block-shaped structure disposed on the moving valve core 3.

[0096] This application does not specifically limit the structure of the elastic element 431; preferably, refer to... Figure 2 and Figure 3The elastic element 431 is a spring to ensure that the elastic element 431 can apply elastic pressure to the moving valve core 3, thereby ensuring the sealing between the moving plate sealing surface 31 and the stationary plate sealing surface 11. In other embodiments, the elastic element 431 can also be a hollow rubber column sleeved outside the guide portion 35 or other structures that can apply elastic pressure to the moving valve core 3.

[0097] Furthermore, refer to Figure 9 The distribution cavity 21 is provided with an annular rib 212 surrounding the shaft hole 22, and the stop rib 42 abuts against the bottom of the annular rib 212.

[0098] It is understandable that the inner diameter of the annular rib 212 is equal to the inner diameter of the shaft hole 22, so that the inner wall of the annular rib 212 can abut against the outer circumferential surface of the transmission shaft 4.

[0099] Since the annular rib 212 is arranged around the shaft hole 22, the contact area between the drive shaft 4 and the mounting base 2 is increased, thereby increasing the stability of the drive shaft 4. This improves the limiting effect of the contact between the drive shaft 4 and the limiting rib 34 on the moving valve core 3, and further increases the stability of the moving valve core 3.

[0100] Meanwhile, by increasing the contact area between the drive shaft 4 and the mounting base 2, the sealing between the drive shaft 4 and the distribution chamber 21 can be increased, so as to prevent the gas in the distribution chamber 21 from leaking through the gap between the drive shaft 4 and the shaft hole 22. This allows more gas in the distribution chamber 21 to enter the air intake channel 33, thereby improving the gas production efficiency of the oxygen generator equipped with the airflow switching rotary valve of this application.

[0101] In addition, it avoids noise caused by gas leakage in the distribution chamber 21 through the gap between the drive shaft 4 and the shaft hole 22, thereby reducing the noise when the airflow switching rotary valve is working, and improving the product quality of the oxygen generator equipped with the airflow switching rotary valve of this application.

[0102] Furthermore, refer to Figure 9 The outer periphery of the drive shaft 4 is provided with an annular groove 44, and a first sealing ring 441 is provided in the annular groove 44. The first sealing ring 441 contacts the hole wall of the shaft hole 22.

[0103] Since the first sealing ring 441 contacts the hole wall of the shaft hole 22, the sealing between the drive shaft 4 and the shaft hole 22 is further increased, so that more gas in the distribution chamber 21 enters the air intake channel 33, thereby further improving the gas production efficiency of the oxygen generator equipped with the airflow switching rotary valve of this application; at the same time, it further reduces the noise generated when the airflow switching rotary valve is working, thereby further improving the product quality of the oxygen generator equipped with the airflow switching rotary valve of this application.

[0104] Since the first sealing ring 441 is set in the annular groove 44, the groove wall of the annular groove 44 can limit the first sealing ring 441 to increase the connection stability between the first sealing ring 441 and the drive shaft 4. On the other hand, it can increase the sealing performance between the first sealing ring 441 and the drive shaft 4, thereby further increasing the sealing performance between the drive shaft 4 and the shaft hole 22.

[0105] This application does not specify the number of annular grooves 44 and first sealing rings 441. Preferably, there are two annular grooves 44, and each annular groove 44 is provided with a first sealing ring 441, that is, there are also two first sealing rings 441, so as to increase the contact points between the drive shaft 4 and the hole wall of the shaft hole 22 through the first sealing rings 441, thereby further increasing the sealing performance between the drive shaft 4 and the shaft hole 22. In other embodiments, there may be one annular groove 44 and one first sealing ring 441, or more than two of each.

[0106] This application does not specify the driving method of the drive shaft 4. Preferably, refer to Figures 1 to 3 The airflow switching rotary valve also includes a motor 5, which is fixedly connected to the mounting base 2. The output shaft of the motor 5 is coaxially arranged with the transmission shaft 4 and the two are connected in a transmission manner to realize automatic drive of the transmission shaft 4 to rotate. In other embodiments, the design of the motor 5 can be omitted, so that the transmission shaft 4 needs to be manually driven.

[0107] In a preferred embodiment, refer to Figure 2 , Figure 3 , Figure 11 and Figure 12 The airflow switching rotary valve also includes a stationary valve core 1 and a valve seat 6. The stationary valve core 1 is provided with a central hole 12 and at least two eccentric holes 13. The valve seat 6 has a receiving cavity 61. The stationary valve core 1 is located inside the receiving cavity 61. The valve seat 6 is provided with a central airflow hole 62 communicating with the central hole 12 and an eccentric airflow hole 63 communicating with the eccentric holes 13. One of the stationary valve core 1 and the valve seat 6 is provided with a limiting part 64, and the other of the two is provided with a mating part 14 for accommodating the limiting part 64.

[0108] It is understandable that the number of eccentric airflow holes 63 is equal to the number of eccentric holes 13 and the two are set in a one-to-one correspondence, and each eccentric airflow hole 63 is connected to its corresponding eccentric hole 13.

[0109] Since one of the stationary valve core 1 and the valve seat 6 is provided with a limiting part 64, and the other is provided with a mating part 14 to accommodate the limiting part 64, the stationary valve core 1 can be limited by the cooperation of the limiting part 64 and the mating part 14, so as to avoid the situation that the stationary valve core 1 may rotate with the moving valve core 3 when the moving valve core 3 rotates, thereby ensuring the working stability of the airflow switching rotary valve.

[0110] This application does not specifically limit the structure of the limiting part 64 and the mating part 14. Preferably, refer to Figure 6 and Figure 11 The mating part 14 is a hole structure provided in the stationary valve core 1, and the limiting part 64 is a columnar structure provided in the cavity wall of the receiving cavity 61. After the stationary valve core 1 is installed into the receiving cavity 61, the columnar structure extends into the hole structure to limit the stationary valve core 1. In other embodiments, the limiting part 64 can also be a block structure provided in the cavity wall of the receiving cavity 61, and the mating part 14 is a notch provided in the outer peripheral surface of the stationary valve core 1. After the stationary valve core 1 is installed into the receiving cavity 61, the block structure is located in the notch to limit the stationary valve core 1; of course, the limiting part 64 can also be a columnar structure provided in the stationary valve core 1, and the mating part 14 is a hole structure provided in the cavity wall of the receiving cavity 61.

[0111] Preferably, air connectors 213 are provided at the air inlet 211, the central airflow hole 62, and the eccentric airflow hole 63 to facilitate the connection of the airflow switching rotary valve with the pipeline.

[0112] Furthermore, refer to Figure 3 The eccentric airflow hole 63 has a deflection section in the middle. The deflection section is inclined from top to bottom in a direction away from the central airflow hole 62 to increase the distance between the air outlet end of the eccentric airflow hole 63 and the central airflow hole 62, thereby facilitating the connection of the air connector 213 to the eccentric airflow hole 63 and the central hole 12.

[0113] Furthermore, refer to Figure 3 and Figure 11 The valve seat 6 is provided with a receiving groove 65 surrounding the central airflow hole 62 and the eccentric airflow hole 63. A second sealing ring 651 is provided in the receiving groove 65. The second sealing ring 651 contacts the end face of the stationary valve core 1 away from the moving valve core 3.

[0114] Since the second sealing ring 651 contacts the end face of the stationary valve core 1 away from the moving valve core 3, it increases the sealing between the stationary valve core 1 and the valve seat 6 to avoid possible air leakage between the stationary valve core 1 and the valve seat 6, thereby increasing the gas production efficiency of the oxygen generator equipped with the airflow switching rotary valve of this application. On the other hand, the second sealing ring 651 can also apply an elastic force to the stationary valve core 1 toward the side where the moving valve core 3 is located, thereby increasing the clamping force between the valve core and the moving valve core 3, and further increasing the sealing between the stationary sealing surface 11 and the moving sealing surface 31.

[0115] Since the second sealing ring 651 is located in the receiving groove 65, it increases the connection stability between the second sealing ring 651 and the valve seat 6 to ensure the sealing effect of the second sealing ring 651 between the stationary valve core 1 and the valve seat 6. On the other hand, it increases the contact area between the second sealing ring 651 and the valve seat 6, thereby further increasing the sealing effect of the second sealing ring 651 between the stationary valve core 1 and the valve seat 6.

[0116] Preferably, multiple accommodating slots 65 are provided corresponding to the central airflow hole 62 and the eccentric airflow hole 63. Each accommodating slot 65 surrounds its corresponding central airflow hole 62 or eccentric airflow hole 63. Each accommodating slot 65 is provided with a second sealing ring 651 to prevent the mixing of the nitrogen gas entering and leaving the adsorption cylinder, so as to ensure the oxygen concentration of the gas produced by the oxygen generator equipped with the airflow switching rotary valve of this application.

[0117] Furthermore, refer to Figure 2 , Figure 3 and Figure 12 One of the mounting base 2 and the valve seat 6 is provided with a sealing groove 66, and a third sealing ring 661 is provided in the sealing groove 66, which contacts the other one of the two.

[0118] Since one of the mounting base 2 and the valve seat 6 is provided with a sealing groove 66, and a third sealing ring 661 is provided in the sealing groove 66, and the third sealing ring 661 contacts the other one, the sealing performance between the mounting base 2 and the valve seat 6 is increased on the one hand to avoid possible air leakage between the mounting base 2 and the valve seat 6. On the other hand, the stability of the third sealing ring 661 is increased to ensure the sealing effect of the third sealing ring 661 between the mounting base 2 and the valve seat 6. Furthermore, the sealing groove 66 can also limit the third sealing ring 661 to prevent displacement of the third sealing ring 661 when the mounting base 2 and the valve seat 6 are assembled together, thereby reducing the difficulty of assembling the mounting base 2 and the valve seat 6 and improving the production efficiency of the airflow switching rotary valve.

[0119] Preferably, the sealing groove 66 is provided on the valve seat 6 and the sealing groove 66 is arranged around the receiving cavity 61 to facilitate the assembly of the mounting base 2 to the valve seat 6, thereby improving the assembly efficiency of the airflow switching rotary valve.

[0120] Furthermore, refer to Figure 5 and Figure 12One of the valve seat 6 and the mounting base 2 is provided with a positioning part 23, and the other is provided with a receiving part 67 to accommodate the positioning part 23. The positioning part 23 and the receiving part 67 can be used to position the mounting base 2 and the valve seat 6, so as to facilitate the subsequent fixed connection of the mounting base 2 and the valve seat 6 together, thereby improving the efficiency of assembling the mounting base 2 and the valve seat 6 together, and further improving the production efficiency of the airflow switching rotary valve.

[0121] The better one is to refer to Figure 12 The outer circumferential surfaces of the mounting base 2 and the valve seat 6 are each provided with a plurality of connecting posts 24, so that the mounting base 2 and the valve seat 6 can be fixedly connected together by means of bolts threaded through two opposite connecting posts 24.

[0122] This application does not specifically limit the structure of the positioning part 23 and the receiving part 67. Preferably, the positioning part 23 is a block structure provided on the periphery of the mounting base 2, and the receiving part 67 is a groove-shaped structure provided on the valve body. After the mounting base 2 is installed on the valve body, the block structure extends into the groove-shaped structure, so as to realize the positioning of the mounting base 2 and the valve seat 6 by means of the plug-in cooperation between the block structure and the groove-shaped structure, so as to facilitate the subsequent fixing of the mounting base 2 and the valve seat 6.

[0123] Preferably, the groove structure is located between the valve seat 6 and the connecting column 24 to make reasonable use of the space between the valve seat 6 and the connecting column 24 and to ensure the connection area between the valve seat 6 and the mounting base 2.

[0124] In other embodiments, the positioning part 23 may also be a columnar structure provided on the valve seat 6, and the receiving part 67 may be a hole structure provided on the mounting base 2.

[0125] This application also discloses an oxygen generator, which includes the airflow switching rotary valve as described above.

[0126] Because the oxygen concentrator in this application uses the aforementioned airflow switching rotary valve, the sealing performance between the stationary sealing surface 11 and the moving sealing surface 31 is increased, thereby preventing the possible mixing of the inlet air and the outlet nitrogen gas of the adsorption tower. This ensures the oxygen concentration of the gas produced by the oxygen concentrator, thus improving the oxygen therapy effect of the oxygen concentrator on patients. At the same time, the structural design of the moving valve core 3 is simplified, thereby reducing the manufacturing cost of the airflow switching rotary valve and consequently reducing the manufacturing cost of the oxygen concentrator.

[0127] For any parts not mentioned in this application, existing technologies may be used or referenced.

[0128] The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on describing the differences from other embodiments.

[0129] The above description is merely an embodiment of this application and is not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. An airflow switching rotary valve characterized by, The gas flow switching rotary valve comprises: a mounting base (2) having a distribution cavity (21) and an air inlet hole (211) in communication with the distribution cavity (21); a moving valve core (3) arranged inside the distribution cavity (21), the moving valve core (3) having a moving valve plate sealing surface (31) provided with an exhaust cavity (32), and the moving valve core (3) being provided with an air inlet passage (33) on the side of the exhaust cavity (32), and the outer circumferential surface of the moving valve core (3) being provided with a plurality of contact positions in contact with the cavity wall of the distribution cavity (21) to limit the relative movement of the moving valve core (3) in the radial direction and limit the deflection of the moving valve core (3) in the axial direction.

2. A gas flow switching rotary valve according to claim 1, characterized in that The outer circumferential surface of the moving valve core (3) is circular, so that any position on the outer circumferential surface of the moving valve core (3) can form the contact position.

3. A gas flow switching rotary valve according to claim 1, characterized in that The gas flow switching rotary valve further comprises a static valve core (1) provided with a central hole (12) and at least two eccentric holes (13), a plurality of the eccentric holes (13) being arranged along the circumference of the central hole (12), the air inlet passage (33) comprising an air inlet cavity (332) capable of communicating with part of the eccentric holes (13) and an air inlet groove (331) in communication with the distribution cavity (21), the air inlet groove (331) being arranged along the circumference of the moving valve core (3).

4. A gas flow switching rotary valve according to any one of claims 1 to 3, characterized in that The mounting base (2) has a shaft hole (22) in communication with the distribution cavity (21), and the gas flow switching rotary valve further comprises a transmission shaft (4) penetrating the shaft hole (22), and the end surface of the moving valve core (3) away from the static valve core (1) is arranged with a plurality of limiting ribs (34) along the circumference of the transmission shaft (4), the inner side surface of each limiting rib (34) abutting against the outer circumferential surface of the transmission shaft (4), and a transmission gap (341) being formed between adjacent two limiting ribs (34), and the side of the transmission shaft (4) being provided with at least one transmission block (41) located in the transmission gap (341).

5. A gas flow switching rotary valve according to claim 4, characterised in that The outer side of each limiting rib (34) is provided with a reinforcing rib (342) fixedly connected to the end surface of the moving valve core (3) away from the static valve core (1), and extending outwardly from the limiting rib (34).

6. A gas flow switching rotary valve according to claim 4, wherein The transmission shaft (4) is provided with a stop rib (42) in stop cooperation with the cavity wall of the distribution cavity (21), and the end of the transmission shaft (4) close to the moving valve core (3) is provided with a mounting cavity (43), and the moving valve core (3) is provided with a guide portion (35) extending into the mounting cavity (43), and the outer portion of the guide portion (35) is sleeved with an elastic member (431) located in the mounting cavity (43), and the elastic member (431) is used to apply an elastic force to the moving valve core (3) in the direction of the static valve core (1).

7. A gas flow switching rotary valve according to claim 6, characterised in that The distribution cavity (21) is provided with an annular rib (212) surrounding the shaft hole (22), and the stop rib (42) abuts against the bottom of the annular rib (212).

8. A gas flow switching rotary valve according to claim 4, characterized in that The outer periphery of the transmission shaft (4) is provided with an annular groove (44), and a first sealing ring (441) is arranged in the annular groove (44) and contacts the hole wall of the shaft hole (22).

9. A gas flow switching rotary valve according to any one of claims 1 to 3, characterized in that The gas flow switching rotary valve further comprises a static valve core (1) and a valve seat (6), the static valve core (1) is provided with a center hole (12) and at least two eccentric holes (13), the valve seat (6) has a containing cavity (61), the static valve core (1) is arranged inside the containing cavity (61), the valve seat (6) is provided with a center gas flow hole (62) communicated with the center hole (12) and an eccentric gas flow hole (63) communicated with the eccentric hole (13), one of the static valve core (1) and the valve seat (6) is provided with a limiting part (64), and the other is provided with a matching part (14) containing the limiting part (64).

10. A gas flow switching rotary valve according to claim 9, characterised in that The valve seat (6) is provided with a containing groove (65) surrounding the center gas flow hole (62) and the eccentric gas flow hole (63), a second sealing ring (651) is arranged in the containing groove (65) and contacts the end face of the static valve core (1) away from the dynamic valve core (3).

11. A gas flow switching rotary valve according to claim 9, characterized in that One of the mounting seat (2) and the valve seat (6) is provided with a sealing groove (66), a third sealing ring (661) is arranged in the sealing groove (66) and contacts the other.

12. A gas flow switching rotary valve according to claim 9, characterized in that One of the valve seat (6) and the mounting seat (2) is provided with a positioning part (23), and the other is provided with a containing part (67) containing the positioning part (23).

13. An oxygen generator, characterized by comprising: The gas flow switching rotary valve comprises the gas flow switching rotary valve as claimed in any one of claims 1-12. The outer periphery of the transmission shaft (4) is provided with an annular groove (44), and a first sealing ring (441) is arranged in the annular groove (44) and contacts the hole wall of the shaft hole (22).

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