Rubber clack check valve

Abstract

The utility model belongs to the technical field of check valves, and particularly discloses a rubber clack check valve which comprises a valve body, a valve deck and a valve clack, a flow channel is formed in the valve body, and a valve seat opening is formed in the position, in the flow channel, of the valve body; a middle hole is formed in the valve body and located between the valve seat opening and the water outlet of the flow channel, the valve deck covers and is fixed to the outer end of the middle hole, and a first limiting block is fixed to the center of the inner end face of the valve deck. A second limiting block is fixed to the center of the end face of the valve clack, the valve clack is rotationally connected with the valve body and used for opening and closing the valve seat opening, and when the valve clack movably opens the valve seat opening to enable the flow channel to be in a full-bore state, the second limiting block can abut against the first limiting block to position the valve clack. When the rubber clack check valve is opened, the valve clack is evenly stressed, and the manufacturing cost is lower than that of a traditional rubber check valve.

Description

Technical Field

[0001] This application belongs to the technical field of check valves, and more specifically, relates to a rubber flap check valve. Background Art

[0002] The rubber flap check valve is an automatic check valve widely used in industrial and agricultural production and urban water supply and drainage to prevent the backflow of media.

[0003] As Figure 1 shown, the traditional rubber flap check valve basically includes a valve body 1a and a valve flap 1b located inside the valve body. In the rubber flap check valve, the closing sealing surface of the valve body 1 at the valve seat is basically set at an angle of about 45 degrees with the center line of the valve body 1, so as to utilize the self-gravity of the valve flap 1b to quickly close the check valve and prevent the backflow of the medium. The opening degree of the valve flap 3 is basically set between 30 - 40 degrees, so that the opening and closing angle of the valve flap 3 is small and the time is short, and full-bore flow of the medium can be achieved when opening. In order to limit the opening degree of the valve flap 1b within the required range, the traditional rubber flap check valve adopts a valve body limiting scheme, that is: an opening degree limiting structure 1c is provided on the inner cavity of the middle hole of the valve body 1 near the outlet end and at the valve flap edge of the valve flap 2 far from the valve flap shaft.

[0004] However, when adopting the above valve body limiting scheme, since the limiting position is at the edge of the valve flap, the valve flap in the open state will be unevenly stressed, affecting the service life of the valve flap. In addition, to meet the full-bore flow requirement under the valve body limiting scheme, the valve flap rocker arm part is required to be longer, so the total length of the valve body is also required to be longer, resulting in a relatively high manufacturing cost of the rubber check valve. Summary of the Utility Model

[0005] In view of the defects or improvement requirements of the prior art, this application provides a rubber flap check valve, aiming to solve the problems of uneven stress on the valve flap when the rubber flap check valve is opened and relatively high manufacturing cost.

[0006] A rubber flap check valve provided by this application specifically includes a valve body, a valve cover and a valve flap, wherein:

[0007] A flow channel is provided inside the valve body, and a valve seat opening is formed by the valve body in the flow channel;

[0008] A middle hole is opened on the valve body, which is located between the valve seat opening and the water outlet of the flow channel. The valve cover covers and is fixed at the outer end of the middle hole, and a first limiting block is fixed at the center of the inner end face of the valve cover;

[0009] A second limiting block is fixed at the center of the end face of the valve flap. The valve flap is rotatably connected to the valve body and is used to open and close the valve seat opening. When the valve flap is opened to make the flow channel full-bore, the second limiting block can abut against the first limiting block to position the valve flap.

[0010] Through the above technical solution conceived by this application, compared with the prior art, this solution adopts a valve cover and valve flap limiting solution, and a limiting block is provided at the center of the end faces of the valve flap and the valve cover, making the force on the valve flap more uniform when it is in the open state and having a longer service life. In addition, the valve flap in this solution does not need to obtain limitation by contacting the valve body, which enables the valve flap to use a shorter rocker arm to achieve an opening degree between 30 degrees and 40 degrees, and the total length of the valve body does not need to be long, which can save costs to a certain extent.

[0011] As a further preference, an included angle of 30 degrees - 40 degrees is formed between the limiting surface of the first limiting block and the sealing surface of the valve seat opening.

[0012] As a further preference, the first limiting block is integrally formed with the valve cover.

[0013] As a further preference, the central part of the valve flap is located between the central axis of the valve body and the valve cover.

[0014] As a further preference, the valve flap includes a core body and an elastic layer covering the surface of the core body.

[0015] As a further preference, the second limiting block is an elastic convex block, and the elastic convex block is integrally formed on the outer surface of the elastic layer.

[0016] As a further preference, an installation groove is formed on the valve body, a connecting part is fixedly connected to the valve flap, and the connecting part is rotatably connected to the installation groove to enable the valve flap to open and close the valve seat opening.

[0017] As a further preference, a third limiting block is fixed at the edge of the inner end face of the valve cover, and the third limiting block extends into the installation groove to limit the connecting part when the second limiting block contacts the first limiting block.

[0018] As a further preference, the connecting part is detachably connected to the installation groove.

[0019] As a further preference, an annular sealing protrusion is provided at one end of the valve flap away from the valve cover, and the annular sealing protrusion is used to contact and seal the valve seat opening when the valve flap closes the valve seat opening.

[0020] Generally speaking, compared with the prior art through the above technical solution conceived by this application, the following technical advantages are mainly possessed:

[0021] 1. This solution adopts a valve cover and valve flap limiting solution, and a limiting block is provided at the center of the end faces of the valve flap and the valve cover, making the force on the valve flap more uniform when it is in the open state and having a longer service life.

[0022] 2. In this solution, the valve flap can adopt a shorter connecting part (i.e., the rocker arm) to achieve the purpose of an opening degree between 30 degrees and 40 degrees, which improves many problems in the traditional solution, such as the need for a very long overall length of the valve body, a very large middle hole, and a very large valve cover, and can save costs to a certain extent. Brief Description of the Drawings

[0023] Figure 1 is the attached drawing of the background art provided by this application;

[0024] Figure 2 is the rubber flap check valve in the closed state provided by the embodiment of this application;

[0025] Figure 3 is the rubber flap check valve in the open state provided by the embodiment of this application.

[0026] In all the drawings, the same reference numerals are used to represent the same elements or structures, where:

[0027] 1a, valve body; 1b, valve flap; 1c, opening limit structure; 1, valve body; 11, flow channel; 12, installation groove; 2, valve cover; 3, valve flap; 31, core body; 32, elastic layer; 33, annular sealing projection; 4, valve seat opening; 5, first limit block; 6, second limit block; 7, connecting part; 8, third limit block. Detailed Embodiment

[0028] In order to make the purpose, technical solution and advantages of this application clearer, the following further details this application in conjunction with the attached drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain this application and are not used to limit this application.

[0029] The following combines the attached Figures 1-3 Further details this application.

[0030] The embodiment of this application discloses a rubber flap check valve. Referring to Figures 2-3 , this rubber flap check valve includes a valve body 1, a valve cover 2 and a valve flap 3, where: a flow channel 11 is provided inside the valve body 1, and a valve seat opening 4 is formed by the valve body 1 in the flow channel 11; a middle hole is opened on the valve body 1, and this middle hole is located between the valve seat opening 4 and the water outlet of the flow channel 11, the valve cover 2 covers and is fixed at the outer end of the middle hole, and a first limit block 5 is fixed at the center of the inner end face of this valve cover 2; correspondingly, a second limit block 6 is fixed at the center of the end face of the valve flap 3, the valve flap 3 is rotatably connected to the valve body 1 and is used to open and close the valve seat opening 4, when the valve flap 3 moves to open the valve seat opening 4 to make the flow channel 11 a full bore, the second limit block 6 can abut against the first limit block 5 to position the valve flap 3.

[0031] Further, in this embodiment, the sealing surface of the valve seat opening 4 and the center line of the valve body 1 (such asFigure 1 The intermittent dotted line shown forms a 45-degree angle to utilize the self-gravity of the valve flap 3 to quickly close the check valve and prevent the backflow of the medium. And an angle of 30 degrees to 40 degrees is formed between the limiting surface of the first limiting block 5 and the sealing surface of the valve seat opening 4, enabling full-bore flow of the medium when the valve flap 3 is opened. Preferably, in some embodiments, an angle of 35 degrees is formed between the limiting surface of the first limiting block 5 and the sealing surface of the valve seat opening 4.

[0032] Preferably, in some embodiments, when the first limiting block 5 abuts against the second limiting block 6, an angle of 30 degrees to 40 degrees is formed between the surface of the valve flap 3 for closing the valve seat opening 4 and the sealing surface of the valve seat opening 4, and this angle is preferably 35 degrees.

[0033] Furthermore, as Figure 2 and Figure 3 shown, an installation groove 12 is provided on the inner wall of the middle hole of the valve body 1, and a connecting portion 7 is fixedly connected to the valve flap 3. The connecting portion 7 is rotatably connected to the installation groove 12 to enable the valve flap 3 to open and close the valve seat. Of course, in other embodiments, the valve flap 3 can also be connected to the valve body 1 by other structural members with a rotational connection function in the prior art.

[0034] As Figure 1 shown, in the design of a rubber flap check valve with valve body limiting in the traditional way, to meet the full-bore requirement, the rocker arm part of the valve flap 1b (i.e., the connecting portion 7 in this design) usually requires a longer length, which also makes the total length of the valve body 1a very long. And because the overall length of the valve flap 1b with a long rocker arm is relatively long, to achieve the limiting purpose and facilitate installation, correspondingly, the middle hole on the valve body 1a basically needs a larger diameter, and the valve cover also needs a larger diameter accordingly, which makes the manufacturing cost of the check valve very high.

[0035] In the design solution of the present invention, as Figures 2-3 shown, after adopting the scheme of using the valve cover 2 and the valve flap 3 for limiting, the limiting position is changed. On the one hand, the second limiting block 6 as the limiting structure is located at the center of the end face of the valve flap 3, making the force on the valve flap 3 more uniform when it is in the open state. On the other hand, since the valve flap 3 does not need to obtain limiting by abutting against the valve body 1, the valve flap 3 can adopt a shorter rocker arm (i.e., the connecting portion 7) to achieve the purpose of an opening degree between 30 degrees and 40 degrees, improving many problems in the traditional scheme such as the very long total length of the valve body 1a, the very large middle hole, and the very large valve cover, and can save costs to a certain extent. Under this design, the central part of the valve flap 3 can be located between the central axis of the valve body 1 and the valve cover 2.

[0036] Of course, in actual production, the length of the connecting portion 7 of the valve flap 3 can be appropriately adjusted to ensure that the overall length of the valve flap 3 meets certain standards.

[0037] Further, for the convenience of personnel to assemble and maintain the check valve, the connecting portion 7 on the valve flap 3 is detachably connected to the installation groove 12; for example, a pin shaft is used to detachably connect the connecting portion 7 to the inner wall of the installation groove 12.

[0038] Further, the valve flap 3 includes a core body 31 and an elastic layer 32 covering the surface of the core body 31. The core body 31 is made of a hard material, and the elastic layer 32 is preferably made of rubber material, so that the valve flap 3 has good sealing performance when closing the valve seat opening 4.

[0039] Further, the second limit block 6 is preferably an elastic convex block, and the elastic convex block is integrally formed on the outer surface of the elastic layer 32. When the valve flap 3 moves to open the valve seat opening 4 to make the flow passage 11 a full-bore diameter, the elastic convex block can elastically abut against the first limit block 5 to position the valve flap 3, so that noise is not easily generated during the abutting process.

[0040] Furthermore, an annular sealing protrusion 33 is provided at one end of the valve flap 3 facing away from the valve cover 2. The annular sealing protrusion 33 is used to abut and seal against the valve seat opening 4 when the valve flap 3 closes the valve seat opening 4 to improve the sealing performance. Among them, preferably, the annular sealing protrusion 33 is integrally formed with the elastic layer 32.

[0041] Further, in this embodiment, the valve cover 2 and the valve body 1 are detachably connected. Specifically, the valve cover 2 and the valve body 1 are any one of flange connection, bolt connection, and buckle connection. To improve the sealing performance, a sealing ring can be hermetically attached between the valve cover 2 and the outer end surface of the middle hole.

[0042] Further preferably, in this embodiment, the first limit block 5 is integrally formed with the valve cover 2. Of course, in other embodiments, the first limit block 5 can also be connected to the valve cover 2 by means of threaded connection, bolt connection, etc.

[0043] Further, to improve the limit stability of the valve flap 3, a third limit block 8 is fixed at the edge of the inner end surface of the valve cover 2. The third limit block 8 extends into the installation groove 12 and is used to limit the connecting portion 7 when the second limit block 6 abuts against the first limit block 5.

[0044] It should be understood that expressions such as "including" and "may include" used in this application indicate the existence of the disclosed functions, operations, or constituent elements, and do not limit the existence of one or more additional functions, operations, and constituent elements. In this application, terms such as "including" and / or "having" can be interpreted as indicating a specific characteristic, number, operation, constituent element, component, or a combination thereof, but cannot be interpreted as excluding the existence or possibility of addition of one or more other characteristics, numbers, operations, constituent elements, components, or a combination thereof.

[0045] It should be understood that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present application.

[0046] In addition, the terms "first" and "second" are only used for descriptive purposes, and should not be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, "a plurality of" means two or more, unless otherwise specifically defined.

[0047] In the present application, unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled", "fixed", etc. should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0048] It is easy for those skilled in the art to understand that the above are only the preferred embodiments of the present application, and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A rubber flap check valve, characterized in that, It comprises a valve body (1), a valve cover (2) and a valve disc (3), wherein: The valve body (1) is provided with a flow channel (11) inside, and the valve body (1) is formed with a valve seat opening (4) in the flow channel (11); The valve body (1) is provided with a central hole, the central hole being located between the valve seat opening (4) and the water outlet of the flow channel (11); the valve cover (2) covers and is fixed to the outer end of the central hole, and a first limit block (5) is fixed at the center of the inner end surface of the valve cover (2); A second limit block (6) is fixed at the center of the end face of the valve flap (3); the valve flap (3) is rotatably connected to the valve body (1) and is used to open and close the valve seat opening (4); when the valve flap (3) moves to open the valve seat opening (4) so ​​that the flow channel (11) is at full diameter, the second limit block (6) can abut against the first limit block (5) to position the valve flap (3).

2. The rubber flap check valve according to claim 1, characterized in that, An included angle of 30 degrees to 40 degrees is formed between the limiting surface of the first limiting block (5) and the sealing surface of the valve seat opening (4).

3. The rubber flap check valve according to claim 1, characterized in that, The first limiting block (5) and the valve cover (2) are integrally formed.

4. The rubber flap check valve according to claim 1, wherein The center portion of the valve flap (3) is located between the center axis of the valve body (1) and the valve cover (2).

5. The rubber flap check valve according to claim 1, characterized in that, The valve flap (3) comprises a core body (31) and an elastic layer (32) coated on the surface of the core body (31).

6. The rubber flap check valve according to claim 5, characterized in that, The second limiting block (6) is an elastic protrusion, and the elastic protrusion is integrally formed on the outer surface of the elastic layer (32).

7. The rubber flap check valve according to any one of claims 1-6, characterized in that The valve body (1) is provided with a mounting groove (12), the valve flap (3) is fixedly connected with a connecting portion (7), and the connecting portion (7) is rotatably connected to the mounting groove (12) to enable the valve flap (3) to open and close the valve seat opening (4).

8. The rubber flap check valve according to claim 7, characterized in that, A third limiting block (8) is fixed at the edge of the inner end surface of the valve cover (2), and the third limiting block (8) extends into the mounting groove (12) to limit the connection portion (7) when the second limiting block (6) contacts the first limiting block (5).

9. The rubber flap check valve according to claim 7, characterized in that, The connecting portion (7) is detachably connected to the mounting groove (12).

10. The rubber flap check valve according to any one of claims 1-6, characterized in that, An annular sealing protrusion (33) is provided at one end of the valve flap (3) facing away from the valve cover (2), and the annular sealing protrusion (33) is used to contact and seal with the valve seat opening (4) when the valve flap (3) closes the valve seat opening (4).

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