One-way valve

Abstract

The invention provides a one-way valve. The one-way valve comprises a valve seat, a valve element and a valve clack. A first bottom wall and a first side wall of the valve seat form a cavity for containing the valve clack and the valve element, and a first sealing ring body is arranged on one end face, on the cavity side, of the first bottom wall. A plurality of second through holes are formed in the second bottom wall of the valve element, and a second sealing ring body is arranged on the end face, facing the first bottom wall, of the second bottom wall of the valve element; the valve clack is arranged between the first bottom wall and the second bottom wall and comprises a support, a sealing ring and at least one valve. When the valve element is connected into the cavity of the valve seat, one end of the second side wall, the sealing ring and the first sealing ring body abut against one another in sequence. The at least one valve has a closed state and an open state. According to the connecting structure of the valve element and the valve seat of the one-way valve, the problem that the valve element falls off from the valve seat is solved; furthermore, the valve clack and the valve element are integrally formed through the coating forming technology, pneumatic system sealing can be achieved through the characteristics of the valve clack, meanwhile, machining cost is saved, and assembling procedures are reduced.

Description

Technical Field

[0001] The present invention relates to the technical field related to vacuum pumps, and in particular to a one-way valve. Background Art

[0002] In the field of vacuum pumps or compressors, the function of a one-way valve is to ensure that air flows in only one direction. In a pneumatic system, a one-way valve is usually composed of a valve core, a valve disc and a valve seat. The valve core is the main body of the one-way valve, on which there are inlet or outlet connections to allow gas to flow. The valve disc can be opened or closed under the pressure of the gas to achieve the function of one-way gas flow. The valve seat is a part used to install the valve body. Generally, when the valve disc is closed, the valve seat and the valve core cooperate to form a sealing structure.

[0003] In the prior art, the valve core is usually pressed into the valve seat, and the connection between the valve core and the valve seat is achieved by the interference fit between the two, and the pneumatic system is sealed at the same time. The connection between the valve flap and the valve core is achieved by a press-fit process. After the valve core is pressed into the valve seat, the above technical solution has the problem of uneven distribution of the contact pressure generated between the valve core and the valve seat. From the bottom of the valve seat to the top of the valve seat, it decreases layer by layer, and the effective matching area between the two parts is reduced. Generally, as the vacuum pump runs for a long time, the temperature inside the pump rises. Under the condition of thermal expansion and contraction, the size of the parts will change slightly, affecting the tightness of the fit between the two parts. The contact pressure between the two parts due to the interference fit decreases. Under the action of axial force, the valve core falls off the valve seat. At the same time, the detachability of the valve core and the valve seat after interference fitting is poor. In addition, the valve flap and the valve core are two parts, which are assembled together by a press-fit process, and the manufacturing and assembly costs are high.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present invention, and therefore may include information that does not constitute the prior art known to those skilled in the art. Summary of the invention

[0005] In view of the problems in the prior art, an object of the present invention is to provide a one-way valve to solve the problem of the valve core falling off from the valve seat in the prior art structure.

[0006] The present invention provides a one-way valve, which comprises a valve seat, a valve core and a valve flap;

[0007] The valve seat comprises a first bottom wall and a first annular side wall, the first bottom wall and the first side wall form a chamber for accommodating the valve flap and the valve core, the first bottom wall is provided with a plurality of first through holes, and a first sealing ring body is provided on an end surface of the first bottom wall on the cavity side;

[0008] The valve core comprises a second bottom wall and an annular second side wall, the second bottom wall is provided with a plurality of second through holes, and a second sealing ring body is provided on an end surface of the second bottom wall facing the first bottom wall;

[0009] The valve flap is arranged between the first bottom wall and the second bottom wall, and comprises a bracket, a sealing ring connected to the bracket, and at least one valve;

[0010] The valve core is connected to the cavity of the valve seat through a connecting unit on the inner side of the first side wall and the outer side of the second side wall;

[0011] When the valve core is connected to the chamber of the valve seat, the end of the second side wall facing the first bottom wall, the sealing ring and the first sealing ring body are abutted in sequence, and the end of the at least one valve not connected to the bracket has a first state and a second state. In the first state, the end of the at least one valve not connected to the bracket is abutted against the second sealing ring body, and in the second state, the end of the at least one valve not connected to the bracket is not abutted against the second sealing ring body.

[0012] According to some examples of the present invention, the connection unit includes a plurality of first protrusion structures disposed on an inner wall of the first side wall and a plurality of second protrusion structures disposed on an outer wall of the second side wall;

[0013] The plurality of second protrusion structures are engaged with the plurality of first protrusion structures.

[0014] According to some examples of the present invention, outer walls of the plurality of second protrusion structures are interference fit with an inner wall of the first side wall.

[0015] According to some examples of the present invention, the plurality of first protrusion structures are evenly distributed along the circumference of the inner wall of the first side wall; and / or

[0016] The plurality of second protrusion structures are evenly distributed along the circumference of the outer wall of the second side wall.

[0017] According to some examples of the present invention, the first sealing ring body is provided with at least one positioning groove;

[0018] At least one third protrusion structure matched with the at least one positioning groove is provided on one side of the sealing ring facing the first bottom wall.

[0019] According to some examples of the present invention, the valve flap is an integrated structure, and the at least one valve is bowl-shaped when aggregated.

[0020] According to some examples of the present invention, the valve core and the valve flap are an integrally formed part.

[0021] According to some examples of the present invention, the valve core is made of metal material;

[0022] The valve flap is made of elastic material.

[0023] According to some examples of the present invention, the integrally formed part of the valve core and the valve flap is obtained by an overmolding process.

[0024] According to some examples of the present invention, the second bottom wall is further provided with an annular covering groove.

[0025] Compared with the prior art, the connection structure between the valve core and the valve seat of the one-way valve of the present invention solves the problem of the valve core falling off the valve seat when it is applied to a device (such as a vacuum pump); further, the valve flap and the valve core can be integrally formed through a coating process, and the pneumatic system sealing can be achieved by utilizing the characteristics of the valve flap itself. The coating molding process of the integrated molding of the valve flap and the valve core saves processing costs while reducing assembly steps. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The drawings herein are incorporated into the specification and constitute a part of the specification, showing embodiments consistent with the present application, and together with the specification, are used to explain the principles of the present application. By reading the detailed description of the non-limiting embodiments with reference to the following drawings, other features, purposes and advantages of the present invention will become more apparent. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings without creative work. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same figure numbers in the figures represent the same or similar parts, and their repeated descriptions will be omitted. Some of the block diagrams shown in the drawings are functional entities and do not necessarily correspond to physically or logically independent entities.

[0027] Figure 1 A structural cross-sectional view of a one-way valve according to an embodiment of the present invention;

[0028] Figure 2 and Figure 3 They are respectively a structural schematic diagram and a cross-sectional view of a valve seat of a one-way valve according to an embodiment of the present invention;

[0029] Figure 4 It is a structural schematic diagram of a valve core of a one-way valve according to an embodiment of the present invention;

[0030] Figure 5 It is a schematic structural diagram of a valve flap of a one-way valve according to an embodiment of the present invention;

[0031] Figure 6 A top view of a valve flap of a one-way valve according to an embodiment of the present invention;

[0032] Figure 7 for Figure 6 A cross-sectional view at KK of ; and

[0033] Figure 8 FIG. 4 is a cross-sectional view of a one-way valve according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in the present invention. The present invention can also be implemented or applied through other different specific embodiments, and the details in the present invention can also be modified or changed according to different viewpoints and application systems without departing from the spirit of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other without conflict.

[0035] The following is a detailed description of the embodiments of the present invention with reference to the accompanying drawings so that those skilled in the art can easily implement the present invention. The present invention can be embodied in many different forms and is not limited to the embodiments described herein.

[0036] In the representation of the present invention, the reference terms "one embodiment", "some embodiments", "examples", "specific examples", or "some examples" etc. mean that the specific features, structures, materials or characteristics represented in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. Moreover, the specific features, structures, materials or characteristics represented may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples represented in the present invention and the features of different embodiments or examples, unless they are contradictory.

[0037] In order to clearly describe the present invention, components not related to the description are omitted, and the same reference numerals are given to the same or similar components throughout the specification.

[0038] Throughout the specification, when a device is said to be "connected" to another device, this includes not only the case of "direct connection" but also the case of "indirect connection" by placing other elements therebetween. In addition, when a device is said to "include" a certain component, unless otherwise stated, it does not exclude other components, but means that other components may be included.

[0039] When a device is said to be "on" another device, it may be directly on the other device, but there may also be other devices between it. In contrast, when a device is said to be "directly" on another device, there are no other devices between it.

[0040] Although the terms first, second, etc. are used to represent various elements in some examples, these elements should not be limited by these terms. These terms are only used to distinguish one element from another element. For example, the first interface and the second interface, etc. are represented. Moreover, as used in this article, the singular forms "one", "one" and "the" are intended to also include plural forms, unless there is an opposite indication in the context. It should be further understood that the terms "comprising" and "including" indicate the existence of features, steps, operations, elements, components, projects, kinds, and / or groups, but do not exclude the existence, occurrence or addition of one or more other features, steps, operations, elements, components, projects, kinds, and / or groups. The terms "or" and "and / or" used herein are interpreted as inclusive, or mean any one or any combination. Therefore, "A, B or C" or "A, B and / or C" means "any of the following: A; B; C; A and B; A and C; B and C; A, B and C". Only when the combination of elements, functions, steps or operations is inherently mutually exclusive in some way, will there be an exception to this definition.

[0041] The technical terms used herein are only used to refer to specific embodiments and are not intended to limit the present invention. The singular form used herein also includes the plural form as long as the sentence does not clearly indicate the opposite meaning. The meaning of "including" used in the specification is to specify specific characteristics, regions, integers, steps, operations, elements and / or components, and does not exclude the existence or addition of other characteristics, regions, integers, steps, operations, elements and / or components.

[0042] Although not defined differently, all terms, including technical and scientific terms used herein, have the same meaning as those generally understood by those skilled in the art to which the present invention belongs. Terms defined in commonly used dictionaries are additionally interpreted as having meanings consistent with the content of relevant technical literature and current disclosures, and unless defined, shall not be overly interpreted as ideal or very formal meanings.

[0043] The structure of the one-way valve of the present invention is further described below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the various specific embodiments are not intended to limit the protection scope of the present invention.

[0044] Figure 1 It is a structural cross-sectional view of a one-way valve according to an embodiment of the present invention. Specifically, the one-way valve includes a valve seat 1 , a valve core 2 and a valve flap 3 . Figure 2 and Figure 3The valve seat 1 includes a first bottom wall 11 and a first annular side wall 12. The first bottom wall 11 and the first side wall 12 form a chamber for accommodating the valve flap 3 and the valve core 2. The first bottom wall 11 is provided with a plurality of first through holes 111 for fluid circulation. The number and shape of the first through holes 111 can be set according to the applicable scene of the one-way valve. The first bottom wall 11 is provided with a first sealing ring body 112 on one end face of the cavity side. Figure 2 As shown, the first sealing ring body 112 and the first bottom wall 11 are in a step shape, and the end surface of the step is the sealing surface of the first sealing ring body 112 .

[0045] Figure 4 This is a schematic diagram of the structure of a valve core in an embodiment. The valve core 2 includes a second bottom wall 21 and an annular second side wall 22. The second bottom wall 21 is provided with a plurality of second through holes 211. Similarly, the plurality of second through holes 211 are provided for fluid circulation. The number and shape of the second through holes 211 can be set according to the applicable scenarios of the one-way valve. A second sealing ring body 212 is provided on one end face of the second bottom wall 21 facing the first bottom wall 11.

[0046] Figure 5 Schematic diagram of the structure of a valve flap according to an embodiment, the valve flap 3 is arranged between the first bottom wall 11 and the second bottom wall 21. Figure 5 This is a view of the valve flap 3 after the one-way valve is assembled, facing away from the first bottom wall 11. The valve flap 3 includes a bracket, a sealing ring 32 connected to the bracket, and at least one valve 33. In this embodiment, the valve flap 3 is an integrated structure, including two valves 33. The bracket includes a central fulcrum 311 and two connecting arms 312. The two ends of the connecting arms 312 are respectively connected to the central fulcrum 311 and the inner side of the sealing ring 32. One end of the valve 33 is connected to the central fulcrum 311 of the bracket, and the other end is suspended. When the flow pressures of the two end faces of the valve 33 are different, the end of the valve 33 that is not connected to the central fulcrum 311 of the bracket can move, see Figure 7 As shown by the dotted arrow.

[0047] The valve core 2 is connected to the chamber of the valve seat 1 through a connecting unit between the inner side of the first side wall 12 of the valve seat 1 and the outer side of the second side wall 22 of the valve core 2; in one embodiment, the connecting unit may include a plurality of first protruding structures 121 disposed on the inner wall of the first side wall 12 and a plurality of second protruding structures 221 disposed on the outer wall of the second side wall 22; Figure 3As shown, a plurality of first protruding structures 121 are at the same height on the inner wall of the first side wall 12 and form a discontinuous protruding ring, and a plurality of second protruding structures 221 form a discontinuous protruding ring on the outer wall of the second side wall 22. The arc length corresponding to the second protruding structure 221 is smaller than the gap between two adjacent first protruding structures 121. When assembling, the valve core 2 is first placed in the valve seat 1, and the valve core 2 is rotated so that the plurality of second protruding structures 221 are engaged with the plurality of first protruding structures 121. The first protruding structure 121 limits the movement of the valve core 2 away from the first bottom wall 11.

[0048] In the above embodiment, the number of the first protrusion structure 121 and the number of the second protrusion structure 221 are both 4, and the present invention does not limit the number of the first protrusion structure 121 and / or the number of the second protrusion structure 221. At the same time, in order to improve the uniformity of the force applied to the seal, the plurality of first protrusion structures 121 can be evenly distributed along the circumference of the inner wall of the first side wall 12, and similarly, the plurality of second protrusion structures 221 can be evenly distributed along the circumference of the outer wall of the second side wall 22.

[0049] When the valve core 2 is connected to the chamber of the valve seat 1, the end of the second side wall 22 facing the first bottom wall 11, the sealing ring 32 and the first sealing ring body 112 are abutted in sequence, that is, the structures of the second side wall 22, the sealing ring 32 and the first sealing ring body 112 need to be adapted to achieve sealing there. In practice, the height of the first protruding structure 121 on the first side wall 12 and the height of the second protruding structure 221 along the axis can be designed to achieve the sealing of the abutment of the end of the second side wall 22, the sealing ring 32 and the first sealing ring body 112, that is, the sealing ring 32 of the axially extruding valve disc is engaged by multiple first protruding structures 121 and multiple second protruding structures 221 to form a self-sealing for the pneumatic system, and the engagement of multiple first protruding structures and multiple second protruding structures prevents the valve core from falling off the valve seat.

[0050] At the same time, since the end of at least one valve 3 that is not connected to the bracket can move, it has a first state and a second state. When at least one valve is aggregated, it is in the first state. At this time, the end of at least one valve 33 that is not connected to the bracket abuts against the second sealing ring body 212, and the second through hole 211 on the second bottom wall 21 is not connected to the first through hole 111 on the first bottom wall 11, that is, the one-way valve is in a closed state. When the end of at least one valve 33 that is not connected to the bracket moves away from the valve core 2, it is in the second state. At this time, the end of at least one valve 33 that is not connected to the bracket does not abut against the second sealing ring body 212. The second state is a state in which the second through hole 211 on the second bottom wall 21 is connected to the first through hole 111 on the first bottom wall 11, that is, the one-way valve is in an open state. It can be seen that only when the fluid pressure on the valve core 2 side is greater than the fluid pressure on the first bottom wall 11 side, or the pressure difference on both sides is greater than a set threshold, the end of the valve 33 not connected to the bracket will move away from the valve core 2 to make the one-way valve in an open state. The one-way method of the present invention can achieve one-way flow of fluid by moving multiple valves 33.

[0051] The number of valves 33 of the valve core 2 can be set according to the specific structure of the one-way valve, and can be 2, 3 or 4, etc., which is not limited here. Preferably, at least one valve 33 is bowl-shaped when aggregated. Figure 6 The cross-sectional view at KK of Figure 7 ), the bowl-shaped structure allows the valve flap to use its own characteristics to achieve pneumatic system sealing, while improving the sealing of the one-way valve in the closed state. At the same time, the outer wall of the plurality of second protrusion structures 221 of the second side wall 22 and the inner wall of the first side wall 12 can be interference-fitted to further improve the airtightness of the one-way valve.

[0052] In one embodiment, the valve core 2 is made of a metal material, such as steel, and the valve flap 3 is made of an elastic material, such as rubber.

[0053] In the present invention, preferably, the valve core 2 and the valve flap 3 are an integrally formed part, and the integrally formed part can be obtained by an overmolding process. The overmolding process is an overmolding process. Taking the valve flap 3 as a rubber material as an example, the overmolding process molds a rubber-like plastic (TPE) on the top of the valve core 2. At this time, the second bottom wall 21 is provided with an annular overmolding groove 213, and correspondingly, the central fulcrum 311 is provided with an annular protrusion 3111 formed in the overmolding groove 213 during overmolding. Figure 8 The cladding process of integrating the valve flap and the valve core can save processing costs and reduce assembly processes.

[0054] In some other embodiments, in order to prevent the valve core 2 from circumferentially moving in the chamber of the valve seat 1, the first sealing ring body 112 is provided with at least one positioning groove 1121; the sealing ring 32 is provided with at least one third protrusion structure 321 that cooperates with the at least one positioning groove 1121 on the side facing the first bottom wall 11. The positioning groove 1121 is not limited to Figure 2 In the embodiment, one, two or more, multiple positioning grooves 1121 can be evenly arranged on the sealing end surface of the first sealing ring body 112. The positioning grooves 1121 can be circular or other shapes, which are not limited here.

[0055] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0056] The above contents are further detailed descriptions of the present invention in combination with specific preferred embodiments, and it cannot be determined that the specific implementation of the present invention is limited to these descriptions. For ordinary technicians in the technical field to which the present invention belongs, several simple deductions or substitutions can be made without departing from the concept of the present invention, which should be regarded as falling within the protection scope of the present invention.

Claims

1. A one-way valve, characterized in that: The one-way valve comprises a valve seat, a valve core and a valve disc; The valve seat comprises a first bottom wall and a first annular side wall, the first bottom wall and the first side wall form a chamber for accommodating the valve flap and the valve core, the first bottom wall is provided with a plurality of first through holes, and a first sealing ring body is provided on an end surface of the first bottom wall on the cavity side; The valve core comprises a second bottom wall and an annular second side wall, the second bottom wall is provided with a plurality of second through holes, and a second sealing ring body is provided on an end surface of the second bottom wall facing the first bottom wall; The valve flap is arranged between the first bottom wall and the second bottom wall, and comprises a bracket, a sealing ring connected to the bracket, and at least one valve; The valve core is connected to the cavity of the valve seat through a connecting unit on the inner side of the first side wall and the outer side of the second side wall; When the valve core is connected to the chamber of the valve seat, the end of the second side wall facing the first bottom wall, the sealing ring and the first sealing ring body are abutted in sequence, and the end of the at least one valve not connected to the bracket has a first state and a second state. In the first state, the end of the at least one valve not connected to the bracket is abutted against the second sealing ring body, and in the second state, the end of the at least one valve not connected to the bracket is not abutted against the second sealing ring body.

2. The one-way valve according to claim 1, characterized in that: The connecting unit includes a plurality of first protrusion structures disposed on the inner wall of the first side wall and a plurality of second protrusion structures disposed on the outer wall of the second side wall; And the plurality of the second protrusion structures are engaged with the plurality of the first protrusion structures.

3. The one-way valve according to claim 2, characterized in that: The outer walls of the plurality of second protrusion structures are interference fit with the inner wall of the first side wall.

4. The one-way valve according to claim 2, characterized in that: The plurality of first protrusion structures are evenly distributed along the circumference of the inner wall of the first side wall; and / or The plurality of second protrusion structures are evenly distributed along the circumference of the outer wall of the second side wall.

5. The one-way valve according to claim 1, characterized in that: The first sealing ring body is provided with at least one positioning groove; At least one third protrusion structure matched with the at least one positioning groove is provided on one side of the sealing ring facing the first bottom wall.

6. The one-way valve according to claim 1, characterized in that: The valve flap is an integrated structure, and the at least one valve is bowl-shaped when aggregated.

7. The one-way valve according to claim 1, characterized in that: The valve core and the valve flap are an integrally formed part.

8. The one-way valve according to claim 7, characterized in that: The valve core is made of metal material; The valve flap is made of elastic material.

9. The one-way valve according to claim 7, characterized in that: The integrally formed part of the valve core and the valve flap is obtained by using a covering molding process.

10. The one-way valve according to claim 9, characterized in that: The second bottom wall is also provided with an annular covering groove.

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