Control valve and oxygen generator

Abstract

The embodiment of the utility model provides a control valve and an oxygen generator. The control valve comprises a valve seat, a guide rod, a diaphragm and a first limiting structure, the valve seat comprises a cavity and an airflow channel communicated with the cavity; the guide rod is movably connected to the airflow channel; the diaphragm is arranged at the end part of the guide rod, and at least part of the diaphragm extends into the cavity and is fixedly connected with the cavity; the first limiting structure is arranged on the side, away from the guide rod, of the diaphragm and used for limiting the deformation degree of the diaphragm. The first limiting structure is arranged on the side, away from the guide rod, of the diaphragm, and when the guide rod moves and drives the diaphragm to deform, the first limiting structure can limit the deformation degree of the diaphragm, namely, the overall deformation degree of the diaphragm can be reduced, so that aging of the diaphragm can be delayed, and the service life of the diaphragm can be prolonged.

Description

Technical Field

[0001] The present application belongs to the technical field of medical equipment, and specifically relates to a control valve and an oxygen concentrator. Background Art

[0002] At present, oxygen concentrators usually use the difference in the adsorption capacity of molecular sieves for nitrogen and oxygen in the air at different pressures to achieve nitrogen and oxygen separation, thereby producing high-purity medical oxygen. Oxygen concentrators usually include interconnected molecular sieves and control valves, wherein the control valve is used to switch the flow direction of the gas to control the gas entering or being discharged from the molecular sieve, so that the molecular sieve switches between the two working processes of nitrogen adsorption and nitrogen desorption, which is conducive to the reuse of the molecular sieve.

[0003] In the prior art, a control valve generally includes a valve seat, a guide rod movably connected to the valve seat, and a diaphragm fixedly connected to the valve seat, wherein at least a portion of the diaphragm is connected to the guide rod, and when the gas flow direction is switched, the guide rod moves and causes the diaphragm to deform. However, since the guide rod may overtravel when moving, this will increase the overall deformation of the diaphragm, thereby accelerating the aging of the diaphragm and reducing the service life of the diaphragm. Utility Model Content

[0004] The present application aims to provide a control valve and an oxygen generator to solve the problem that when the guide rod of the existing control valve moves beyond the stroke, the overall deformation degree of the diaphragm increases, resulting in a reduction in the service life of the diaphragm.

[0005] In order to solve the above technical problems, this application is implemented as follows:

[0006] In a first aspect, the present application discloses a control valve, the control valve comprising: a valve seat, a guide rod, a diaphragm and a first limiting structure;

[0007] The valve seat includes a chamber and an air flow channel communicating with the chamber;

[0008] The guide rod is movably connected to the air flow channel;

[0009] The diaphragm is arranged at the end of the guide rod, and at least a part of the diaphragm extends into the chamber and is fixedly connected to the chamber;

[0010] The first limiting structure is arranged on a side of the diaphragm away from the guide rod, and the first limiting structure is used to limit the deformation degree of the diaphragm.

[0011] Optionally, the valve seat further comprises a valve cover, the valve cover is fixedly connected to the chamber and is located on a side of the diaphragm away from the guide rod;

[0012] The first limiting structure is arranged on a side of the valve cover close to the diaphragm.

[0013] Optionally, the valve cover and the first limiting structure are an integrally formed structure.

[0014] Optionally, the first limiting structure is a limiting protrusion, and the limiting protrusion is extended along the circumference of the valve cover.

[0015] Optionally, the first limiting structure includes a plurality of limiting protrusions, and the plurality of limiting protrusions are arranged at intervals along the circumference of the valve cover.

[0016] Optionally, the control valve further comprises a second limiting structure, wherein the second limiting structure is arranged on a side of the diaphragm away from the valve cover, and the second limiting structure is used to limit the deformation degree of the diaphragm.

[0017] Optionally, the second limiting structure is a limiting ring, and a side of the limiting ring close to the diaphragm is in an arc shape.

[0018] Optionally, the extending direction of the guide rod is a first direction, and the height of the first limiting structure along the first direction is h, satisfying 0.5 mm≤h≤3.5 mm.

[0019] Optionally, in a direction from the center of the diaphragm to the edge of the diaphragm, the diaphragm includes a first connecting portion, a deformation portion, and a second connecting portion which are sequentially arranged;

[0020] Wherein, the first connecting portion is connected to the guide rod, and the second connecting portion is fixedly connected to the chamber.

[0021] Optionally, the extending direction of the guide rod is a first direction, and the first connecting portion has a first projection perpendicular to the first direction;

[0022] The first limiting structure is located within the first projection range.

[0023] Optionally, the deformation portion protrudes in a direction away from the guide rod;

[0024] The connection between the deformation portion and the first connection portion and the connection between the deformation portion and the second connection portion both have smooth transitions.

[0025] Optionally, a connection between the deformation portion and the first connection portion, and a connection between the deformation portion and the second connection portion are both in a rounded transition shape.

[0026] Optionally, the extending direction of the guide rod is a first direction;

[0027] At the connection point between the deformation portion and the first connection portion, and at the connection point between the deformation portion and the second connection portion, the thickness of the diaphragm along the first direction increases or decreases gradually.

[0028] Optionally, the valve seat further comprises a valve cover, the valve cover is fixedly connected to the chamber and is located on a side of the diaphragm away from the guide rod;

[0029] The control valve further comprises a sealing ring, which is arranged between the valve cover and the inner wall of the chamber to achieve a sealed connection between the valve cover and the chamber.

[0030] Optionally, the control valve further comprises a pilot valve, the pilot valve is arranged above the valve seat, and the pilot valve comprises: a pilot valve seat, a pilot valve cover, a coil assembly and an iron core assembly;

[0031] The pilot valve seat, the pilot valve cover and the coil assembly are sequentially arranged along the second direction and enclose a valve cavity, and at least a portion of the core assembly is movably connected to the valve cavity;

[0032] The pilot valve seat is provided with an air guide hole and a pilot hole, and the air guide hole and the pilot hole are both connected to the valve cavity;

[0033] The coil assembly has an energized state and an unenergized state. In the unenergized state, the core assembly abuts against the air guide hole to separate the air guide hole from the pilot hole. In the energized state, the core assembly releases the abutment against the air guide hole to connect the air guide hole with the pilot hole.

[0034] Optionally, the control valve further comprises a flow plate, wherein the flow plate is arranged between the pilot valve and the valve seat;

[0035] The flow plate is provided with a transition hole, and the transition hole is used to connect the pilot valve with the gas path inside the valve seat.

[0036] In a second aspect, the present application further discloses an oxygen concentrator, which comprises the control valve described in any one of the above items.

[0037] In the embodiment of the present application, the control valve includes: a valve seat, a guide rod, a diaphragm and a first limiting structure; the valve seat includes a chamber and an airflow channel connected to the chamber; the guide rod is movably connected to the airflow channel; the diaphragm is arranged at the end of the guide rod, and at least part of the diaphragm extends into the chamber and is fixedly connected to the chamber; the first limiting structure is arranged on the side of the diaphragm away from the guide rod, and the first limiting structure is used to limit the deformation degree of the diaphragm. In this way, since the first limiting structure is arranged on the side of the diaphragm away from the guide rod, when the guide rod moves and drives the diaphragm to deform, the first limiting structure can limit the deformation degree of the diaphragm, that is, it can reduce the overall deformation degree of the diaphragm, thereby delaying the aging of the diaphragm, which is conducive to increasing the service life of the diaphragm.

[0038] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0040] Figure 1 This is one of the structural schematic diagrams of a control valve provided in an embodiment of the present application;

[0041] Figure 2 This is the second structural schematic diagram of a control valve provided in an embodiment of the present application;

[0042] Figure 3 This is the third structural schematic diagram of a control valve provided in an embodiment of the present application;

[0043] Figure 4 is a cross-sectional view at a certain angle of a control valve provided in an embodiment of the present application;

[0044] Figure 5 is a cross-sectional view from another angle of a control valve provided in an embodiment of the present application;

[0045] Figure 6 is a cross-sectional view at another angle of a control valve provided in an embodiment of the present application;

[0046] Figure 7 It is a structural schematic diagram of a pilot valve of a control valve provided in an embodiment of the present application;

[0047] Figure 8 It is a structural schematic diagram of an upper valve cover of a control valve provided in an embodiment of the present application;

[0048] Fig. 9It is a structural schematic diagram of a first diaphragm of a control valve provided in an embodiment of the present application;

[0049] Fig.10 is a schematic structural diagram of a second diaphragm of a control valve provided in an embodiment of the present application;

[0050] Fig.11 It is a schematic diagram of the structure of a third diaphragm of a control valve provided in an embodiment of the present application.

[0051] Figure numerals: 1. valve seat, 11. chamber, 111. upper chamber, 112. lower chamber, 12. air flow channel, 13. air inlet, 14. air outlet, 15. exhaust port, 2. guide rod, 3. diaphragm, 31. upper diaphragm, 32. lower diaphragm, 33. first connecting part, 34. deformation part, 35. second connecting part, 4. valve cover, 41. upper valve cover, 411. vent hole, 42. lower valve cover, 43. first limiting Position structure, 5. Sealing ring, 6. Second limiting structure, 7. Clamp ring, 8. Circulation plate, 81. First transition hole, 82. Second transition hole, 9. Pilot valve, 91. Pilot valve seat, 911. Pilot hole, 912. Air guide hole, 92. Pilot valve cover, 93. Coil assembly, 94. Valve cavity, 95. Static iron core, 951. Air vent, 96. Moving iron core, 97. Reset spring, X. First direction, Y. Second direction. DETAILED DESCRIPTION

[0052] The embodiments of the utility model will be described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the utility model, and cannot be understood as limiting the utility model. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0053] The term "first" or "second" in the specification and claims of this application may include one or more of the features explicitly or implicitly. In the description of this utility model, unless otherwise specified, "multiple" means two or more. In addition, "and / or" in the specification and claims means at least one of the connected objects, and the character " / " generally means that the objects connected before and after are in an "or" relationship.

[0054] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0055] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0056] In the prior art, an oxygen generator generally includes a molecular sieve, a compressor, and a control valve. The control valve is connected to the molecular sieve and the compressor, respectively. The control valve is used to switch the flow direction of the gas inside the oxygen generator, thereby controlling the gas to enter or be discharged from the molecular sieve, so that the molecular sieve can switch between two working states: nitrogen adsorption oxygen production and nitrogen desorption desorption. Specifically, in the nitrogen adsorption oxygen production state, the high-pressure air generated by the compressor enters the molecular sieve through the control valve, and the molecular sieve performs nitrogen adsorption oxygen production. Before the nitrogen adsorption capacity of the molecular sieve tends to saturation, the control valve switches the flow direction of the gas so that the molecular sieve switches to the nitrogen desorption desorption state, and the nitrogen is desorbed from the molecular sieve and discharged.

[0057] An embodiment of the present application provides a control valve, and the control valve of the present application is described in detail below with reference to the accompanying drawings.

[0058] Reference Figures 1 to 3 , showing a schematic diagram of the structure of a control valve provided in an embodiment of the present application, referring to Figures 4 to 6 , showing a cross-sectional view of a control valve provided by an embodiment of the application at three angles, referring to Figure 7 , showing a schematic diagram of the structure of a pilot valve of a control valve provided in an embodiment of the present application, referring to Figure 8 , showing a schematic diagram of the structure of an upper valve cover of a control valve provided in an embodiment of the present application, referring to Figures 9 to 11 , showing a schematic structural diagram of three diaphragms of a control valve provided in an embodiment of the present application.

[0059] like Figures 1 to 6 As shown, the present application provides a control valve, which includes: a valve seat 1, a guide rod 2, a diaphragm 3 and a first limiting structure 43; the valve seat 1 includes a chamber 11 and an air flow channel 12 connected to the chamber 11; the guide rod 2 is movably connected to the air flow channel 12; the diaphragm 3 is arranged at the end of the guide rod 2, and at least part of the diaphragm 3 extends into the chamber 11 and is fixedly connected to the chamber 11; the first limiting structure 43 is arranged on the side of the diaphragm 3 away from the guide rod 2, and the first limiting structure 43 is used to limit the deformation degree of the diaphragm 3.

[0060] In the embodiment of the present application, since the first limiting structure 43 is provided on the side of the diaphragm 3 facing away from the guide rod 2, when the guide rod 2 moves and drives the diaphragm 3 to deform, the first limiting structure 43 can limit the deformation degree of the diaphragm 3, that is, the overall deformation degree of the diaphragm 3 can be reduced, thereby delaying the aging of the diaphragm 3, which is beneficial to improving the service life of the diaphragm 3.

[0061] It should be noted that the control valve of the embodiment of the present application includes but is not limited to a two-position control valve, a three-position control valve, etc., wherein the two-position control valve includes two groups of valve structures that can be used separately and have the same structure. The embodiment of the present application is described based on one group of valve structures, and other valve structures that can be used separately and have the same structure are not described in detail. In practical applications, since the adsorption capacity of a single molecular sieve is limited and oxygen cannot be produced continuously, two molecular sieves are usually set in practical applications, and the two molecular sieves work alternately. Specifically, one of the two molecular sieves performs nitrogen adsorption to produce oxygen, and the other performs nitrogen desorption and desorption, and the working state is switched before the nitrogen adsorption capacity of the molecular sieve performing nitrogen adsorption to produce oxygen tends to be saturated. In this way, the oxygen generator can continuously output oxygen. That is, the control valve in the oxygen generator is usually a two-position control valve.

[0062] In a specific application, the extension direction of the guide rod 2 is defined as a first direction X, the airflow channel 12 of the embodiment of the present application extends along the first direction X, and two chambers 11 are provided, namely an upper chamber 111 and a lower chamber 112, the upper chamber 111 and the lower chamber 112 are respectively arranged at the two ends of the airflow channel 12 along the first direction X and are both connected to the airflow channel 12, and correspondingly, two diaphragms 3 are provided, namely an upper diaphragm 31 and a lower diaphragm 32, the upper diaphragm 31 and the lower diaphragm 32 are respectively arranged at the two ends of the guide rod 2 along the first direction, wherein at least a portion of the upper diaphragm 31 extends into the upper chamber 111 and is fixedly connected to the upper chamber 111, and at least a portion of the lower diaphragm 32 extends into the lower chamber 112 and is fixedly connected to the lower chamber 112. The valve seat 1 is also provided with an air inlet 13, an air outlet 14 and an exhaust port 15, wherein the air inlet 13 is connected to the space between the lower diaphragm 32 and the air flow channel 12, and the air inlet 13 is used to connect to the compressor; the air outlet 14 is connected to the air flow channel 12, and the air outlet 14 is used to connect to the molecular sieve; the exhaust port 15 is connected to the space between the upper diaphragm 31 and the air flow channel 12, so that the gas is discharged into the atmosphere or a designated device. In the nitrogen adsorption oxygen production state, the upper diaphragm 31 is deformed and blocks the upper end of the air flow channel 12, so that the air inlet 13 is connected to the air outlet 14, so that the high-pressure gas generated by the compressor enters the control valve from the air inlet 13, and enters the molecular sieve through the air outlet 14 to achieve nitrogen adsorption oxygen production. In the nitrogen desorption and desorption state, the lower diaphragm 32 is deformed and blocks the lower end of the air flow channel 12, and the nitrogen desorbed by the molecular sieve enters the control valve from the air outlet 14, and is discharged through the exhaust port 15 to achieve nitrogen desorption and desorption.

[0063] In some optional embodiments of the present application, the valve seat 1 further comprises a valve cover 4, which is fixedly connected to the chamber 11 and is located on the side of the diaphragm 3 away from the guide rod 2; the first limiting structure 43 is arranged on the side of the valve cover 4 close to the diaphragm 3.

[0064] In the embodiment of the present application, since the first limiting structure 43 is arranged on the side of the valve cover 4 close to the diaphragm 3, when the diaphragm 3 is deformed, it can first abut against the first limiting structure 43, thereby limiting the deformation degree of the side of the diaphragm 3 close to the valve cover 4.

[0065] It should be noted that the valve cover 4 and the first limiting structure 43 can be an integrally formed structure or a split-formed structure, which is not limited here, and those skilled in the art can make a choice according to actual needs. It can be understood that when the valve cover 4 and the first limiting structure 43 are an integrally formed structure, the assembly process of the control valve can be simplified. In practical applications, the valve cover 4 includes an upper valve cover 41 and a lower valve cover 42, the upper valve cover 41 is arranged in the upper chamber 111, the upper valve cover 41 and the upper diaphragm 31 are enclosed to form an upper air chamber, and the lower valve cover 42 is arranged in the lower chamber 112, and the lower valve cover 42 and the lower diaphragm 32 are enclosed to form a lower air chamber. In addition, the control valve also includes a circulation plate 8, which is fixedly connected to the side of the valve seat 1 close to the upper valve cover 41, and the circulation plate 8 can limit the position of the upper valve cover 41. The control valve further includes a clamping ring 7 , which is fixedly connected to the lower chamber 112 and is located on a side of the lower valve cover 42 away from the lower diaphragm 32 . The clamping ring 7 can limit the position of the lower valve cover 42 .

[0066] In some optional embodiments of the present application, the first limiting structure 43 is a limiting protrusion, and the limiting protrusion is extended along the circumference of the valve cover 4.

[0067] In practical applications, the diaphragm 3 is usually made of a soft rubber material, such as silicone, and the valve cover 4 is made of a metal material, such as aluminum. During the operation of the oxygen generator, since the high-pressure gas generated by the compressor is usually at a high temperature, part of the diaphragm 3 will adhere to the valve cover 4 during the deformation process of the diaphragm 3, which will accelerate the aging of the diaphragm 3 and increase the risk of rupture and leakage of the diaphragm 3. In the embodiment of the present application, a limiting protrusion is provided, and the limiting protrusion is extended along the circumference of the valve cover 4. In this way, on the one hand, compared with the direct contact between the diaphragm 3 and the valve cover 4, the contact area of ​​the diaphragm 3 and the limiting protrusion can be reduced when the diaphragm 3 contacts the limiting protrusion, thereby reducing the adhesion and helping to increase the service life of the diaphragm 3. On the other hand, the limiting protrusion can evenly limit the entire circumference of the diaphragm 3, thereby avoiding excessive local deformation of the diaphragm 3 and affecting the service life of the diaphragm 3. In one of the embodiments, Figure 8 As shown, the valve cover 4 includes a body and an annular peripheral wall, the annular peripheral wall is arranged around the body and is located on the side of the body close to the diaphragm 3, and the body and the annular peripheral wall enclose a receiving cavity; the limiting protrusion is an annular limiting protrusion, the annular limiting protrusion is arranged in the receiving cavity and is fixedly connected to the body, the annular limiting protrusion protrudes in the direction away from the body, and the annular limiting protrusion coincides with the axis of the body and the annular peripheral wall. Among them, the annular limiting protrusion means that the cross section of the limiting protrusion perpendicular to the first direction X is annular.

[0068] In some optional embodiments of the present application, the first limiting structure 43 includes a plurality of limiting protrusions, and the plurality of limiting protrusions are arranged at intervals along the circumference of the valve cover 4 .

[0069] In the embodiment of the present application, since a plurality of limiting protrusions are provided, the plurality of limiting protrusions are arranged at intervals along the circumference of the valve cover 4. Compared with the annular limiting protrusions, the plurality of limiting protrusions arranged at intervals can further reduce the contact area between the first limiting structure 43 and the diaphragm 3, thereby further reducing the adhesion.

[0070] It should be noted that the specific number of the limiting protrusions is not limited in the embodiment of the present application, and those skilled in the art can adjust it according to actual needs. Multiple limiting protrusions can be arranged at uniform intervals or at non-uniform intervals, which is not limited here. It can be understood that when multiple limiting protrusions are arranged at uniform intervals, the entire circumference of the diaphragm 3 can be uniformly limited, which is conducive to the uniform deformation of the diaphragm 3. For example, three limiting protrusions can be arranged, and the three limiting protrusions are arranged at uniform intervals along the circumference of the valve cover 4.

[0071] In some optional embodiments of the present application, the extension direction of the guide rod 2 is the first direction X, and the height of the first limiting structure 43 along the first direction X is h, which satisfies 0.5mm≤h≤3.5mm. According to tests, when the height of the first limiting structure 43 along the first direction X satisfies 0.5mm≤h≤3.5mm, the problem of overtravel of the guide rod 2 can be effectively solved without affecting the movement of the diaphragm 3, thereby effectively limiting the overall deformation degree of the diaphragm 3, which is conducive to improving the service life of the diaphragm 3.

[0072] In some optional embodiments of the present application, the control valve further includes a second limiting structure 6, which is disposed on the side of the diaphragm 3 away from the valve cover 4, and is used to limit the degree of deformation of the diaphragm 3. In this way, when the diaphragm 3 deforms in a direction away from the valve cover 4, on the one hand, the second limiting structure 6 can provide a deformation guide for the diaphragm 3; on the other hand, the second limiting structure 6 can limit the degree of deformation of the side of the diaphragm 3 away from the valve cover 4.

[0073] Taking the diaphragm 31 as an example, when the guide rod 2 moves downward along the first direction X, the second limiting structure 6 below it will limit the upper diaphragm 31 from continuing to move downward on the basis of ensuring the effective ventilation stroke, thereby reducing the movement amplitude of the upper diaphragm 31, which is conducive to limiting the downward deformation degree of the upper diaphragm 31; when the guide rod 2 moves upward along the first direction X, the first limiting structure 43 above the upper diaphragm 31 will limit the upper diaphragm 31 from continuing to move upward on the basis of ensuring the effective ventilation stroke, so that the upper diaphragm 31 (soft rubber material) and the end face of the valve cover 4 (aluminum material) will not adhere to each other, and the movement amplitude of the diaphragm 3 is reduced, which is conducive to limiting the upward deformation degree of the upper diaphragm 31. That is, the embodiment of the present application can effectively limit the deformation of the diaphragm 3 along the first direction X by respectively setting the first limiting structure 43 and the second limiting structure 6 on both sides of the diaphragm 3 along the first direction X, that is, above and below the diaphragm 3, thereby reducing the overall deformation degree of the diaphragm 3, which is conducive to improving the service life of the diaphragm 3.

[0074] It should be noted that the control valve of the embodiment of the present application may be provided with a second limiting structure 6 on the side of the upper diaphragm 31 away from the upper valve cover 41, and / or on the side of the lower diaphragm 32 away from the lower valve cover 42, which is not limited here, and those skilled in the art may adjust it according to actual needs. In one embodiment, as Figures 4 to 5 As shown, one second limiting structure 6 is provided, and the second limiting structure 6 is provided on a side of the upper diaphragm 31 facing away from the upper valve cover 41 .

[0075] In some optional embodiments of the present application, the side of the second limiting structure 6 close to the diaphragm 3 is in an arc shape. In this way, by setting the side of the second limiting structure 6 close to the diaphragm 3 to be in an arc shape, when the diaphragm 3 is deformed and contacts the second limiting structure 6, the second limiting structure 6 can be prevented from damaging or puncturing the diaphragm 3, which is conducive to improving the service life of the diaphragm 3.

[0076] In some optional embodiments of the present application, such as Figures 9 and 10 As shown, from the center of the diaphragm 3 to the edge of the diaphragm 3, the diaphragm 3 includes a first connection portion 33, a deformation portion 34, and a second connection portion 35, which are sequentially arranged; wherein the first connection portion 33 is connected to the guide rod 2, and the second connection portion 35 is fixedly connected to the chamber 11. In this way, the connection between the diaphragm 3 and the guide rod 2 can be achieved through the connection between the first connection portion 33 and the guide rod 2, and the fixed connection between the diaphragm 3 and the chamber 11 can be achieved through the fixed connection between the second connection portion 35 and the chamber 11. In addition, the diaphragm 3 is abutted against the channel opening of the airflow channel 12 through the first connection portion 33, thereby achieving the blocking of one end of the airflow channel 12.

[0077] It should be noted that the deformation portion 34 is the location where the diaphragm 3 mainly deforms. The deformation portion 34 may be as follows: Fig. 9The convex shape shown can also be as Fig.10 The straight shape shown. Compared with the straight deformation portion 34, the starting pressure required for the convex deformation portion 34 to deform is smaller. On the one hand, the movement of the diaphragm 3 is more sensitive, and one end of the airflow channel 12 can be blocked in a shorter time, thereby quickly switching the gas flow direction. On the other hand, in areas with high altitudes, that is, when the external pressure is low, the convex deformation portion 34 can achieve effective sealing. In one embodiment, the deformation portion 34 of the upper diaphragm 31 is convex, and the deformation portion 34 of the lower diaphragm 32 is straight, and the deformation portion 34 of the lower diaphragm 32 is provided with a plurality of balancing holes for gas circulation.

[0078] In practical applications, the valve cover 4 includes a body and an annular peripheral wall, the annular peripheral wall is arranged around the body and is located on one side of the body near the diaphragm, and one end of the annular peripheral wall near the diaphragm 3 presses the second connecting portion 35 of the diaphragm 3, so that the diaphragm 3 is reliably fixed in the chamber 11. In addition, the control valve also includes a sealing ring 5, which is arranged between the valve cover 4 and the inner wall of the chamber 11 to achieve a sealed connection between the valve cover 4 and the chamber 11; specifically, an annular groove is arranged on one side of the annular peripheral wall near the inner wall of the chamber 11, and the sealing ring 5 is arranged in the annular groove to achieve a sealed connection between the valve cover 4 and the chamber 11.

[0079] In some optional embodiments of the present application, the extension direction of the guide rod 2 is the first direction X, the first connecting portion 33 has a first projection perpendicular to the first direction X; and the first limiting structure 43 is located within the first projection range.

[0080] In practical applications, in order to ensure the sensitivity of the diaphragm 3, the thickness of the deformation part 34 along the first direction X is usually smaller than the thickness of the first connection part 33 along the first direction X, and the thickness of the second connection part 35 along the first direction X, that is, during the frequent operation of the diaphragm 3, the deformation part 34 is more likely to have the risk of rupture and leakage than the first connection part 33 and the second connection part 35. Based on this, by setting the first limiting structure 43 within the first projection range of the first connection part 33, the first limiting structure 43 can be prevented from directly contacting the thinner deformation part 34. On the one hand, the influence of the first limiting structure 43 on the sensitivity of the diaphragm 3 can be reduced; on the other hand, the deformation part 34 can be prevented from being damaged or punctured due to frequent friction and collision with the first limiting structure 43, which is beneficial to improving the service life of the diaphragm 3.

[0081] In actual applications, when the deformation portion 34 of the diaphragm 3 is in a convex shape, that is, the deformation portion 34 convexes in the direction away from the guide rod 2, during the frequent movement of the diaphragm 3, that is, the frequent upside-down flipping, stress concentration is likely to occur at the connection between the deformation portion 34 and the first connection portion 33, and at the connection between the deformation portion 34 and the second connection portion 35, and the shear resistance is poor, resulting in cracks at the connection between the deformation portion 34 and the first connection portion 33, and the second connection portion 35, causing air leakage, thereby causing failure of the control valve.

[0082] In one embodiment, if Fig.11 As shown, the connection between the deformation portion 34 and the first connection portion 33, and the connection between the deformation portion 34 and the second connection portion 35 are both in a right-angle transition shape, or can be in a sharp-angle transition shape. This structure is simple and easy to process. However, during the frequent movement of the diaphragm 3, the connection between the deformation portion 34 and the first connection portion 33, and the connection between the deformation portion 34 and the second connection portion 35 have sharp angles and right angles, resulting in uneven thickness transitions, which makes it easy for the diaphragm 3 to have crack points. When the diaphragm 3 is constantly moving, it is easy to break from the crack points, causing the diaphragm 3 to be damaged and leak.

[0083] It should be noted that the deformation portion 34 of the embodiment of the present application can be convex or straight. The drawings of the embodiment of the present application only show the case where the deformation portion 34 is straight. In actual applications, the deformation portion 34 can also be convex. This is not limited here, and technical personnel in this field can make adjustments according to actual needs.

[0084] In another embodiment, Fig. 9 As shown, the deformation portion 34 protrudes in the direction away from the guide rod 2; the connection between the deformation portion 34 and the first connection portion 33 and the connection between the deformation portion 34 and the second connection portion 35 are all smoothly transitioned. The smooth transition can make the transition of the connection more uniform, disperse the stress of the diaphragm 3 during repeated actions, effectively avoid stress concentration and the existence of cracking points, improve the shear resistance of the diaphragm 3, and make it difficult for the diaphragm 3 to be damaged and leaked during repeated actions, which is conducive to improving the service life of the diaphragm 3.

[0085] It should be noted that smooth transition means that there is no sharp angle structure (not limited to acute angle, obtuse angle or right angle) at the connection, that is, the thickness from the deformation part 34 to the first connection part 33 and from the deformation part 34 to the second connection part 35 changes continuously and evenly and the surface is smooth as a whole.

[0086] Specifically, the connection between the deformation part 34 and the first connection part 33, and the connection between the deformation part 34 and the second connection part 35 can both be rounded transition. The rounded transition not only increases the thickness of the diaphragm but also makes the transition of the connection more uniform, disperses the stress of the diaphragm 3 during repeated actions, thereby effectively avoiding stress concentration and the existence of cracking points, improving the shear resistance of the diaphragm 3, and preventing damage and leakage even during repeated actions, effectively increasing the service life of the diaphragm 3.

[0087] It should be noted that, for the diaphragm 3 having a straight deformation portion 34, Fig.10 As shown, those skilled in the art may also set the connection between the deformation portion 34 and the first connection portion 33 and the second connection portion 35 to be a rounded transition shape, which is not limited here.

[0088] In some optional embodiments of the present application, the extension direction of the guide rod 2 is the first direction X; at the connection between the deformation portion 34 and the first connection portion 33, and at the connection between the deformation portion 34 and the second connection portion 35, the thickness of the diaphragm 3 along the first direction X increases or decreases. That is, the thickness of the connection between the deformation portion 34 and the first connection portion 33, and the connection between the deformation portion 34 and the second connection portion 35 along the first direction X changes uniformly, thereby improving the overall structural strength of the diaphragm 3, which is beneficial to improving the service life of the diaphragm 3. In addition, since the service life of the diaphragm 3 determines the service life of the control valve. Therefore, improving the service life of the diaphragm 3 can improve the overall service life of the control valve, reduce the probability of maintenance, and help reduce the operation and maintenance costs of the oxygen generator.

[0089] In some optional embodiments of the present application, such as Figure 7 As shown, the control valve further includes a pilot valve 9 , which is disposed above the valve seat 1 . Specifically, the pilot valve 9 is disposed on a side of the valve seat 1 close to the upper chamber 111 . The pilot valve 9 is arranged above the valve seat 1, and the pilot valve 9 includes: a pilot valve seat 91, a pilot valve cover 92, a coil assembly 93 and an iron core assembly; the pilot valve seat 91, the pilot valve cover 92 and the coil assembly 93 are arranged in sequence along the second direction Y and enclose a valve cavity 94, and at least part of the iron core assembly is movably connected to the valve cavity 94; the pilot valve seat 91 is provided with an air guide hole 912 and a pilot hole 911, and the air guide hole 912 and the pilot hole 911 are both connected to the valve cavity 94; the coil assembly 93 has an energized state and a de-energized state. In the de-energized state, the iron core assembly abuts against the air guide hole 912 to separate the air guide hole 912 from the pilot hole 911; in the energized state, the iron core assembly releases the abutment with the air guide hole 912 to connect the air guide hole 912 with the pilot hole 911. In this way, by turning the coil assembly 93 on or off, the core assembly can be moved in the valve chamber 94 , and the pilot hole 911 can be opened or closed by releasing or contacting the core assembly with the pilot hole 911 .

[0090] It should be noted that the energized state of the coil assembly 93 refers to the situation where the coil assembly 93 is energized, and the de-energized state refers to the situation where the coil assembly 93 is de-energized. In addition, the second direction Y of the embodiment of the present application refers to a radial direction of the guide rod 2, and the second direction Y is perpendicular to the first direction X. In one embodiment, the valve cavity 94 includes a side wall extending along the second direction Y and a bottom wall perpendicular to the second direction Y, the pilot hole 911 is arranged on the side wall, and the air guide hole 912 is arranged on the bottom wall. The core assembly moves along the second direction Y in the valve cavity 94, so that it can abut or release the abutment with the air guide hole 912, thereby realizing the isolation or connection between the air guide hole 912 and the pilot hole 911.

[0091] In some optional embodiments of the present application, the iron core assembly includes: a static iron core 95, a moving iron core 96 and a reset spring 97; the static iron core 95 and the moving iron core 96 are sequentially arranged in the valve cavity 94 along the second direction Y, at least a portion of the static iron core 95 is fixedly connected to the valve cavity 94 and is opposite to the position of the coil assembly 93, and the moving iron core 96 is movably connected to the valve cavity 94; the reset spring 97 is sleeved on the moving iron core 96, and the reset spring 97 has a compressed state and an extended state; in the de-energized state, the reset spring 97 is in an extended state, and the moving iron core 96 abuts against the air guide hole 912; in the energized state, the static iron core 95 adsorbs the moving iron core 96, the reset spring 97 is in a compressed state, and the moving iron core 96 is released from the abutment with the air guide hole 912. Among them, the static iron core 95 is provided with an air leakage hole 951, and the air leakage hole 951 is connected with the valve chamber 94; in the de-energized state, the moving iron core 96 abuts against the air guide hole 912 to connect the air leakage hole 951 with the pilot hole 911; in the energized state, the moving iron core 96 releases the abutment with the air guide hole 912 to separate the air leakage hole 951 from the pilot hole 911.

[0092] In the embodiment of the present application, since a static iron core 95 is provided, when the coil assembly 93 is energized, the static iron core 95 generates an adsorption force, thereby adsorbing the moving iron core 96 to move in a direction away from the air guide hole 912. During this process, the moving iron core 96 releases its contact with the air guide hole 912 and contacts with the air leakage hole 951 of the static iron core 95, thereby connecting the pilot hole 911 with the air guide hole 912 and is isolated from the air leakage hole 951, thereby allowing the gas to enter the interior of the valve seat 1 through the air guide hole 912 and the pilot hole 911. Due to the provision of the reset spring 97, when the coil assembly 93 is de-energized, the adsorption force of the static iron core 95 disappears, and under the elastic action of the reset spring 97, the moving iron core 96 moves toward the direction close to the air guide hole 912. In this process, the moving iron core 96 abuts against the air guide hole 912 and releases the abutment against the air leakage hole 951, so that the pilot hole 911 is separated from the air guide hole 912 and connected to the air leakage hole 951, thereby allowing the gas to be discharged through the pilot hole 911 and the air leakage hole 951.

[0093] It should be noted that the adsorption force generated by the static iron core 95 should be greater than the elastic force of the return spring 97 when it is in a compressed state, so that the static iron core 95 can smoothly adsorb the movable iron core 96 and move in a direction away from the pilot hole 911 to release the abutment against the pilot hole 911.

[0094] In some optional embodiments of the present application, a protrusion is provided at one end of the moving iron core 96 away from the static iron core 95; the reset spring 97 has two ends that are arranged away from each other along the second direction Y, and one end of the reset spring 97 close to the static iron core 95 abuts against at least part of the valve seat 1, and one end of the reset spring 97 away from the static iron core 95 abuts against the protrusion. In this way, the reset spring 97 can be reliably fixed in the valve cavity 94, and provide elastic force when the adsorption force of the static iron core 95 disappears, so that the moving iron core 96 is reset and abuts against the air guide hole 912, thereby closing the air guide hole 912.

[0095] In some optional embodiments of the present application, the upper valve cover 41 is provided with a vent hole 411, and the control valve further includes a circulation plate 8, which is provided between the pilot valve 9 and the valve seat 1; the circulation plate 8 is provided with a transition hole, and the transition hole is used to connect the pilot valve 9 with the air path inside the valve seat 1. In this way, on the one hand, by connecting and fixing the circulation plate 8 with the pilot valve 9 above it and the valve seat 1 below it, the control valve can be connected as a whole, which is beneficial to improving the integrity of the control valve. On the other hand, since the transition hole is provided, the transition hole can connect the pilot valve 9 with the air path inside the valve seat 1, thereby realizing effective connection between the pilot valve 9 and the valve seat 1.

[0096] Specifically, the transition hole is provided with a first transition hole 81 and a second transition hole 82, wherein the first transition hole 81 is respectively communicated with the pilot hole 911 and the vent hole 411 of the upper valve cover 41, and the second transition hole 82 is respectively communicated with the air guide hole 912 and the air inlet 13. It should be noted that the flow plate 8 is also provided with sealing members at corresponding positions of the first transition hole 81 and the second transition hole 82 to prevent gas from leaking from the gap between the flow plate 8 and the valve seat 1, and / or the flow plate 8 and the pilot valve 9, which is beneficial to improve the sealing performance of the control valve.

[0097] The following is an example of a specific working process of the control valve of an embodiment of the present application:

[0098] When the coil assembly 93 of the pilot valve 9 is powered off, the leak hole 951 is opened and the air guide hole 912 is closed. Part of the gas entering from the air inlet 13 enters the lower air chamber formed by the lower diaphragm 32 and the lower valve cover 42 through the balance hole of the lower diaphragm 32. As the air pressure in the lower air chamber increases, the guide rod 2 can be pushed to move upward so that the first connecting portion 33 of the lower diaphragm 32 blocks the lower end of the air flow channel 12. The gas in the upper air chamber formed by the upper diaphragm 31 and the upper valve cover 41 is discharged through the vent hole 411, the first transition hole 81, the pilot hole 911 and the leak hole 951 in turn. At this time, the air outlet 14 is connected to the exhaust port 15, and the nitrogen desorption of the molecular sieve can be realized. In this process, since the upper valve cover 41 is provided with a first limiting structure 43, the guide rod 2 can be prevented from moving over the travel, thereby effectively limiting the deformation degree of the lower diaphragm 32.

[0099] When the coil assembly 93 of the pilot valve 9 is energized, the air guide hole 912 is opened and the air leakage hole 951 is closed. Part of the gas entering from the air inlet 13 enters the upper air chamber through the air guide hole 912, the pilot hole 911, the first transition hole 81, and the vent hole 411 in sequence. As the air pressure in the upper air chamber increases, the upper diaphragm 31 deforms in the direction away from the upper valve cover 41 and pushes the guide rod 2 to move downward, so that the first connecting portion 33 of the upper diaphragm 31 blocks the upper end of the air flow channel 12. At this time, the air inlet 13 is connected to the air outlet 14, and nitrogen adsorption and oxygen production can be achieved. In this process, since the lower valve cover 42 is provided with a first limiting structure 43, it can prevent the guide rod 2 from moving over the travel, thereby effectively limiting the deformation degree of the upper diaphragm 31.

[0100] In summary, the control valve provided in the embodiment of the present application has at least the following advantages:

[0101] On the one hand, the first limiting structure is arranged on the side of the diaphragm away from the guide rod, and the first limiting structure is used to limit the deformation degree of the diaphragm. In this way, since the first limiting structure is arranged on the side of the diaphragm away from the guide rod, when the guide rod moves and drives the diaphragm to deform, the first limiting structure can limit the deformation degree of the diaphragm, that is, the overall deformation degree of the diaphragm can be reduced, thereby delaying the aging of the diaphragm, which is beneficial to improve the service life of the diaphragm. Taking the above diaphragm as an example, when the upper diaphragm moves upward, the first limiting structure above it will limit the upper diaphragm from continuing to move on the basis of ensuring the effective ventilation stroke, so that the upper diaphragm (soft rubber material) and the end face of the upper valve cover (aluminum material) will not adhere to each other, and the movement amplitude of the upper diaphragm is improved, thereby reducing the risk of shear cracking at the transition position between the thickness of the upper diaphragm and improving the service life of the diaphragm.

[0102] On the other hand, since the diaphragm includes a first connection part, a deformation part, and a second connection part which are arranged in sequence from the center to the edge of the diaphragm, and the connection between the deformation part and the first connection part, and the connection between the deformation part and the second connection part are in a rounded transition shape, stress concentration can be effectively avoided, the shear resistance of the diaphragm can be improved, and the diaphragm is not prone to damage and leakage during repeated actions, which effectively increases the service life of the diaphragm.

[0103] An embodiment of the present application further provides an oxygen concentrator, which includes the control valve described in any one of the above embodiments.

[0104] It should be noted that in the embodiment of the present application, the structure of the control valve is the same as the structure of the control valve described in any of the above embodiments, and its beneficial effects are also similar, which will not be elaborated here.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0106] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A control valve, characterized in that: The control valve comprises: a valve seat, a guide rod, a diaphragm and a first limiting structure; The valve seat includes a chamber and an air flow channel communicating with the chamber; The guide rod is movably connected to the air flow channel; The diaphragm is arranged at the end of the guide rod, and at least a part of the diaphragm extends into the chamber and is fixedly connected to the chamber; The first limiting structure is arranged on a side of the diaphragm away from the guide rod, and the first limiting structure is used to limit the deformation degree of the diaphragm.

2. The control valve according to claim 1, characterized in that: The valve seat further comprises a valve cover, which is fixedly connected to the chamber and is located on a side of the diaphragm away from the guide rod; The first limiting structure is arranged on a side of the valve cover close to the diaphragm.

3. The control valve according to claim 2, characterized in that: The valve cover and the first limiting structure are integrally formed.

4. The control valve according to claim 2, characterized in that: The first limiting structure is a limiting protrusion, and the limiting protrusion is extended along the circumference of the valve cover.

5. The control valve according to claim 2, characterized in that: The first limiting structure includes a plurality of limiting protrusions, and the plurality of limiting protrusions are arranged at intervals along the circumference of the valve cover.

6. The control valve according to claim 2, characterized in that: The control valve further includes a second limiting structure, which is disposed on a side of the diaphragm away from the valve cover, and is used to limit the degree of deformation of the diaphragm.

7. The control valve according to claim 6, characterized in that The second limiting structure is a limiting ring, and a side of the limiting ring close to the diaphragm is in an arc shape.

8. The control valve according to claim 1, characterized in that: The extending direction of the guide rod is a first direction, and the height of the first limiting structure along the first direction is h, satisfying 0.5 mm≤h≤3.5 mm.

9. The control valve according to claim 1, characterized in that: In the direction from the center of the diaphragm to the edge of the diaphragm, the diaphragm includes a first connecting portion, a deformation portion, and a second connecting portion which are arranged in sequence; Wherein, the first connecting portion is connected to the guide rod, and the second connecting portion is fixedly connected to the chamber.

10. The control valve according to claim 9, characterized in that The extending direction of the guide rod is a first direction, and the first connecting portion has a first projection perpendicular to the first direction; The first limiting structure is located within the first projection range.

11. The control valve according to claim 9, characterized in that The deformed portion protrudes in a direction away from the guide rod; The connection between the deformation portion and the first connection portion and the connection between the deformation portion and the second connection portion both have smooth transitions.

12. The control valve according to claim 11, characterized in that A connection point between the deformation portion and the first connection portion, and a connection point between the deformation portion and the second connection portion are both in a rounded transition shape.

13. The control valve according to claim 9, characterized in that The extending direction of the guide rod is a first direction; At the connection point between the deformation portion and the first connection portion, and at the connection point between the deformation portion and the second connection portion, the thickness of the diaphragm along the first direction increases or decreases gradually.

14. The control valve according to claim 1, characterized in that The valve seat further comprises a valve cover, which is fixedly connected to the chamber and is located on a side of the diaphragm away from the guide rod; The control valve further comprises a sealing ring, which is arranged between the valve cover and the inner wall of the chamber to achieve a sealed connection between the valve cover and the chamber.

15. The control valve according to claim 1, characterized in that The control valve further comprises a pilot valve, which is arranged above the valve seat, and the pilot valve comprises: a pilot valve seat, a pilot valve cover, a coil assembly and an iron core assembly; The pilot valve seat, the pilot valve cover and the coil assembly are sequentially arranged along the second direction and enclose a valve cavity, and at least a portion of the core assembly is movably connected to the valve cavity; The pilot valve seat is provided with an air guide hole and a pilot hole, and the air guide hole and the pilot hole are both connected to the valve cavity; The coil assembly has an energized state and an unenergized state. In the unenergized state, the core assembly abuts against the air guide hole to separate the air guide hole from the pilot hole. In the energized state, the core assembly releases the abutment against the air guide hole to connect the air guide hole with the pilot hole.

16. The control valve according to claim 15, characterized in that The control valve further comprises a flow plate, wherein the flow plate is arranged between the pilot valve and the valve seat; The flow plate is provided with a transition hole, and the transition hole is used to connect the pilot valve with the gas path inside the valve seat.

17. An oxygen concentrator, characterized in that: The oxygen generator comprises the control valve according to any one of claims 1-16.

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