Diaphragm check valve

Abstract

The utility model provides a diaphragm check valve which comprises a valve body, a valve cover and a diaphragm. A runner inlet and a runner outlet are formed in the left side and the right side of the valve body respectively, the diaphragm is arranged between the valve cover and the valve body, the valve cover is fixed to the upper end of the valve body and presses the outer edge of the diaphragm on the valve body, an annular supporting plate is arranged on the inner side of the upper end of the valve body, and a plurality of overflowing holes distributed at intervals in the circumferential direction are formed in the edge of the annular supporting plate. Each overflowing hole is communicated with the inner end part of the runner inlet, and the inner edge of the annular supporting plate is connected with the inner end part of the runner outlet into a whole; a plurality of supporting pieces distributed at intervals in the circumferential direction are arranged on the inner wall of the valve deck. An inner cavity of the valve cover is communicated with the flow channel outlet; when the diaphragm moves upwards, the supporting pieces are used for abutting against the upper end of the diaphragm, and when the diaphragm moves downwards, the lower end of the diaphragm is used for abutting against the annular supporting plate and blocking each overflowing hole. The utility model can be installed at any position, and can bear higher medium pressure.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a diaphragm check valve. Background Art

[0002] Diaphragm check valve is a valve that can be opened or closed by the diaphragm with the help of the medium to prevent the medium from flowing back. It belongs to the automatic valve category and is widely used in industrial pipelines in the petroleum, chemical, electric power, shipbuilding and other industries. The working principle of the diaphragm check valve: when the medium flows in the specified direction, the diaphragm is separated from the valve body under the action of the medium pressure, and the valve opens; when the medium flows back, the diaphragm falls back to the valve body under the combined action of its own weight, spring load (if spring preload is set) and the reaction force of the reflux medium, so as to prevent the medium from flowing back.

[0003] However, because the diaphragm and other moving parts have considerable weight, the effect of gravity on their movement is different in different installation positions, resulting in most diaphragm check valves can only be installed in the horizontal or vertical position determined during the design, affecting the applicability of the valve. Some diaphragm check valves also use spring reset. Although they can be used in different installation positions, the performance is different. In some positions, it may be difficult to fully open the diaphragm check valve. If a lightweight diaphragm that is less affected by gravity is used, it is generally more difficult to withstand the medium pressure. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a diaphragm check valve which can be installed at any position and can withstand a higher medium pressure.

[0005] The utility model provides a diaphragm check valve, comprising a valve body, a valve cover and a diaphragm; a flow channel inlet and a flow channel outlet are respectively arranged on the left and right sides of the valve body, the diaphragm is arranged between the valve cover and the valve body, the valve cover is fixed to the upper end of the valve body and presses the outer edge of the diaphragm onto the valve body, an annular support plate is arranged on the inner side of the upper end of the valve body, a plurality of flow holes distributed at circumferential intervals are arranged at the edge of the annular support plate, each flow hole is communicated with the inner end portion of the flow channel inlet, the inner edge of the annular support plate is connected to the inner end portion of the flow channel outlet as a whole; a plurality of support sheets distributed at circumferential intervals are arranged on the inner wall of the valve cover; the inner cavity of the valve cover is communicated with the flow channel outlet; when the diaphragm moves upward, the plurality of support sheets are used to abut against the upper end of the diaphragm, and when the diaphragm moves downward, the lower end of the diaphragm is used to abut against the annular support plate and block each flow hole.

[0006] After the utility model adopts the above structure, when the diaphragm check valve is in an open state, the medium enters from the flow channel inlet, and the medium applies an upward thrust to the diaphragm through the flow hole. At this time, the medium flows to the flow channel outlet through the flow hole, and in order to prevent the medium pressure from exceeding the bearing limit of the diaphragm, the diaphragm can be supported under the action of the support sheet to balance the pressure caused by the medium on the diaphragm, thereby enabling the diaphragm check valve to operate at a higher working pressure. At the same time, the diaphragm can be lightweight, that is, during operation, the diaphragm can be basically unaffected by gravity, so that the valve can be installed in any position.

[0007] In a possible embodiment, the upper surface of the annular support plate gradually extends downward from the outside to the inside and forms a first circular arc surface in a ring shape, and the first circular arc surface is used to abut against the lower end of the diaphragm; by setting the upper surface of the annular support plate to gradually extend downward from the outside to the inside and form a first circular arc surface in a ring shape, after the diaphragm moves downward, the lower end of the diaphragm can more reliably abut against the annular support plate and achieve the blocking of each flow hole.

[0008] In one possible embodiment, the lower edge of each support plate is gradually inclined upward from the outside to the inside and forms a second arc surface, and the second arc surface is used to abut against the upper end of the diaphragm; by providing a second arc surface that gradually tilts upward from the outside to the inside at the lower edge of each support plate, after the diaphragm moves upward, the upper end of the diaphragm can reliably abut against the second arc surface, that is, each support plate can achieve reliable support for the diaphragm.

[0009] In a possible embodiment, the diaphragm check valve also includes a pressure-taking joint, a pressure-conducting tube and a pressure-conducting joint; the pressure-taking joint is connected to the valve body and communicated with the flow channel outlet, the pressure-conducting joint is connected to the middle of the upper end of the valve cover and communicated with the inner cavity of the valve cover, and the two ends of the pressure-conducting tube are respectively communicated with the pressure-taking joint and the pressure-conducting joint; by adopting this structure, under the action of the pressure-taking joint, the pressure-conducting tube and the pressure-conducting joint, the inner cavity of the valve cover can be reliably communicated with the flow channel outlet. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is a three-dimensional structural schematic diagram of the utility model;

[0011] Figure 2 It is a schematic cross-sectional view of the structure of the utility model when it is in an open state;

[0012] Figure 3 It is a schematic cross-sectional structural diagram of the utility model when it is in a closed state. DETAILED DESCRIPTION

[0013] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0014] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" 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 directly connected or indirectly connected through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0015] In the embodiments of the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0016] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0017] See also Figure 1-3 As shown, the embodiment of the present application discloses a diaphragm check valve, including a valve body 1, a valve cover 2 and a diaphragm 3; a flow channel inlet 11 and a flow channel outlet 12 are respectively arranged on the left and right sides of the valve body 1, the diaphragm 3 is arranged between the valve cover 2 and the valve body 1, the valve cover 2 is fixed to the upper end of the valve body 1 and the outer edge of the diaphragm 3 is pressed against the valve body 1, an annular support plate 13 is arranged on the inner side of the upper end of the valve body 1, and a plurality of flow holes 14 distributed at intervals in the circumferential direction are arranged at the edge of the annular support plate 13, each flow hole 14 having a plurality of circumferentially spaced flow holes 14. The holes 14 are all connected to the inner end of the flow channel inlet 11, and the inner edge of the annular support plate 13 is connected to the inner end of the flow channel outlet 12. A plurality of support sheets 21 are arranged on the inner wall of the valve cover 2 at circumferential intervals. The inner cavity of the valve cover 2 is connected to the flow channel outlet 12. When the diaphragm 3 moves upward, the plurality of support sheets 21 are used to abut against the upper end of the diaphragm 3, and when the diaphragm 3 moves downward, the lower end of the diaphragm 3 is used to abut against the annular support plate 13 and block each flow hole 14.

[0018] The upper surface of the annular support plate 13 gradually extends downward from the outside to the inside and forms a first circular arc surface 15 in a ring shape, and the first circular arc surface 15 is used to abut against the lower end of the diaphragm 3; by setting the upper surface of the annular support plate to gradually extend downward from the outside to the inside and form a first circular arc surface in a ring shape, after the diaphragm moves downward, the lower end of the diaphragm can more reliably abut against the annular support plate and achieve the blocking of each flow hole.

[0019] The lower edge of each support sheet 21 is gradually inclined upward from the outside to the inside and forms a second arc surface 22, and the second arc surface 22 is used to abut against the upper end of the diaphragm 3; by providing a second arc surface that gradually tilts upward from the outside to the inside at the lower edge of each support sheet, after the diaphragm moves upward, the upper end of the diaphragm can reliably abut against the second arc surface, that is, each support sheet can achieve reliable support for the diaphragm.

[0020] The diaphragm check valve also includes a pressure-taking joint 4, a pressure-conducting pipe 5 and a pressure-conducting joint 6; the pressure-taking joint 4 is connected to the valve body 1 and communicated with the flow channel outlet 12, the pressure-conducting joint 6 is connected to the middle of the upper end of the valve cover 2 and communicated with the inner cavity of the valve cover 2, and the two ends of the pressure-conducting pipe 5 are respectively communicated with the pressure-taking joint 4 and the pressure-conducting joint 6; by adopting this structure, under the action of the pressure-taking joint, the pressure-conducting pipe and the pressure-conducting joint, the inner cavity of the valve cover can be reliably communicated with the flow channel outlet.

[0021] like Figure 2 As shown, when the utility model is opened, the medium enters from the flow channel inlet, and the medium exerts an upward thrust on the diaphragm through the flow hole. At this time, the medium flows to the flow channel outlet through the flow hole, and in order to prevent the medium pressure from exceeding the bearing limit of the diaphragm, the diaphragm can be supported under the action of the support sheet to balance the pressure caused by the medium on the diaphragm, so that the diaphragm one-way valve can work under a higher working pressure. At the same time, the diaphragm can be lightweight, that is, during operation, the diaphragm can be basically unaffected by gravity, so that the valve can be installed in any position.

[0022] like Figure 3 As shown, the medium flows back from the flow channel outlet into the diaphragm one-way valve. At this time, the medium pressure can act on the center position of the lower part of the diaphragm through the flow channel outlet, and because the inner cavity of the valve cover is connected to the flow channel outlet, the medium pressure can also act on the upper part of the diaphragm. However, because the medium acts on the upper part of the diaphragm to contact the entire area of ​​the diaphragm, and the medium acts on the lower part of the diaphragm to contact a partial area of ​​the diaphragm, the diaphragm will move downward and fit tightly against the annular support plate, that is, the flow hole is blocked, so that the diaphragm one-way valve can achieve the purpose of non-return.

[0023] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A diaphragm check valve, comprising a valve body (1), a valve cover (2) and a diaphragm (3); a flow channel inlet (11) and a flow channel outlet (12) are respectively arranged on the left and right sides of the valve body (1); the diaphragm (3) is arranged between the valve cover (2) and the valve body (1); the valve cover (2) is fixed to the upper end of the valve body (1) and presses the outer edge of the diaphragm (3) against the valve body (1); the characteristics are: An annular support plate (13) is provided on the inner side of the upper end of the valve body (1), and a plurality of flow holes (14) are provided at the edge of the annular support plate (13) and are distributed at intervals in the circumferential direction, and each of the flow holes (14) is communicated with the inner end of the flow channel inlet (11), and the inner edge of the annular support plate (13) is integrally connected with the inner end of the flow channel outlet (12); a plurality of support sheets (21) are provided on the inner wall of the valve cover (2) and are distributed at intervals in the circumferential direction; the inner cavity of the valve cover (2) is communicated with the flow channel outlet (12); when the diaphragm (3) moves upward, the plurality of support sheets (21) are used to abut against the upper end of the diaphragm (3), and when the diaphragm (3) moves downward, the lower end of the diaphragm (3) is used to abut against the annular support plate (13) and block each of the flow holes (14).

2. The diaphragm check valve according to claim 1, characterized in that: The upper surface of the annular support plate (13) gradually extends downward from the outside to the inside and forms a first circular arc surface (15) in a ring shape. The first circular arc surface (15) is used to abut against the lower end of the diaphragm (3).

3. The diaphragm check valve according to claim 1, characterized in that: The lower edge of each support sheet (21) is gradually inclined upward from the outside to the inside and forms a second arc surface (22), and the second arc surface (22) is used to abut against the upper end of the diaphragm (3).

4. The diaphragm check valve according to any one of claims 1 to 3, characterized in that: The diaphragm check valve further comprises a pressure-taking joint (4), a pressure-conducting pipe (5) and a pressure-conducting joint (6); the pressure-taking joint (4) is connected to the valve body (1) and communicates with the flow channel outlet (12), the pressure-conducting joint (6) is connected to the middle of the upper end of the valve cover (2) and communicates with the inner cavity of the valve cover (2), and the two ends of the pressure-conducting pipe (5) are respectively communicated with the pressure-taking joint (4) and the pressure-conducting joint (6).

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