A diaphragm connection piece, diaphragm driving mechanism and diaphragm valve

Abstract

The application discloses a diaphragm connecting piece, a diaphragm driving mechanism and a diaphragm valve. The diaphragm connecting piece comprises a connecting part for being connected with a valve rod and a supporting part for being matched with a diaphragm. The end faces of the connecting part and the supporting part are arc faces. The diaphragm connecting piece is provided with a connecting hole for being connected with the diaphragm. The connecting hole extends from the end face of the supporting part to the connecting part. The end faces of the connecting part and the supporting part of the diaphragm connecting piece are arc faces. The point contact between the arc end face of the connecting part and the valve rod enables the diaphragm connecting piece to be self-adjusted at a small angle relative to the valve rod. The arc end face of the supporting part can be tightly matched with the diaphragm, so that the diaphragm valve can be closed with the smallest torque while the balanced stress of the diaphragm is ensured.

Description

Technical Field

[0001] This invention relates to the field of diaphragm valve diaphragm actuation, and more specifically, to a diaphragm connector, a diaphragm actuation mechanism, and a diaphragm valve. Background Technology

[0002] The diaphragm valve's opening and closing element is a diaphragm. The diaphragm separates the lower valve body cavity from the upper cylinder or valve cover cavity, so that the valve stem, valve disc, and other parts located above the diaphragm are not corroded by the medium and have the advantage of preventing medium leakage.

[0003] In existing diaphragm valves, the diaphragm is connected to the valve stem via a connector, with the connector and valve stem using a floating fit. This fit prevents the connector from excessively compressing the diaphragm. However, the diaphragm may shift slightly during installation, while the point of application of the valve stem's output force on the diaphragm remains constant during the valve stem's rotation. In this case, the floating fit between the connector and valve stem can actually lead to uneven stress on the diaphragm. This forces the valve stem to output a larger torque for the diaphragm valve to close completely.

[0004] Therefore, how to provide a mechanism that can effectively ensure the balanced force on the diaphragm and close the diaphragm valve with a small torque has become a technical problem that urgently needs to be solved in this field. Summary of the Invention

[0005] One objective of this invention is to provide a new technical solution for a diaphragm connector that can effectively ensure balanced stress on the diaphragm and close the diaphragm valve with a small torque.

[0006] According to a first aspect of the present invention, a diaphragm connector is provided.

[0007] The diaphragm connector includes a connecting part for connecting to the valve stem and a supporting part for cooperating with the diaphragm, wherein the end faces of the connecting part and the supporting part are both arc-shaped surfaces;

[0008] The diaphragm connector is provided with a connection hole for connecting to the diaphragm, and the connection hole extends from the end face of the support to the connector.

[0009] Optionally, the end faces of both the connecting portion and the supporting portion are arc surfaces.

[0010] According to a second aspect of the present invention, a diaphragm drive mechanism is provided.

[0011] The diaphragm drive mechanism includes a diaphragm, a valve stem, a fixing member, and a diaphragm connector as disclosed herein; wherein,

[0012] The diaphragm includes a diaphragm body and a connecting rod, with both ends of the connecting rod connected to the diaphragm body and the connecting hole, respectively.

[0013] The valve stem is provided with a connecting groove, the connecting part is located in the connecting groove, and the connecting part is clearance-fitted with the connecting groove. The end face of the connecting part is tangent to the bottom surface of the connecting groove.

[0014] The fastener is used to limit the connecting part within the connecting groove.

[0015] Optionally, the connecting rod is threadedly connected to the connecting hole.

[0016] Optionally, the width of the connecting groove gradually increases along the direction toward the diaphragm body, while the outer diameter of the connecting portion remains unchanged.

[0017] Optionally, the outer wall of the connecting part is provided with a retaining ring groove, and the inner wall of the connecting groove is provided with a retaining ring mating groove;

[0018] The fastener is a retaining ring, and the retaining ring mates with the retaining ring groove and the retaining ring mating groove.

[0019] Optionally, the diaphragm drive mechanism further includes a seal;

[0020] The outer diameter of the support portion is larger than the outer diameter of the connecting portion. The support portion is provided with a sealing element positioning groove for positioning the sealing element. The sealing element is located in the sealing element positioning groove and abuts against the end face of the valve stem.

[0021] Optionally, the diaphragm drive mechanism further includes a valve core, which is located between the diaphragm connector and the diaphragm body;

[0022] The valve core is provided with an upper support groove, a lower mating surface and a connecting rod hole. The upper support groove is adapted to the end face of the support part. The lower mating surface is an arc-shaped surface and is adapted to the surface of the valve body away from the diaphragm valve. The connecting rod hole is mated with the connecting rod.

[0023] Optionally, the surface area of ​​the lower mating surface is greater than the surface area of ​​the upper support mating groove.

[0024] According to a third aspect of the present invention, a diaphragm valve is provided.

[0025] The diaphragm valve includes a valve body, a valve cover, and a diaphragm actuation mechanism disclosed herein, wherein the diaphragm actuation mechanism is located within the enclosed space formed by the valve body and the valve cover.

[0026] The end faces of the connecting part and the support part of the diaphragm connector disclosed herein are both arc-shaped. The arc-shaped end face of the connecting part makes point contact with the area on the valve stem that mates with the end face of the connecting part. Thus, when the valve stem rotates to close the valve, the diaphragm connector can self-adjust its position within a small angle relative to the valve stem within a 360° range. Moreover, the arc-shaped end face of the support part can fit tightly with the diaphragm, so that while ensuring the diaphragm is subjected to balanced force, the diaphragm valve can be closed with minimal torque.

[0027] Other features and advantages of the invention will become clear from the following detailed description of exemplary embodiments of the invention with reference to the accompanying drawings. Attached Figure Description

[0028] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the invention and, together with their description, serve to explain the principles of the invention.

[0029] Figure 1 This is a schematic diagram of an embodiment of the diaphragm valve drive mechanism disclosed herein.

[0030] Figure 2 This is a schematic diagram of the structure of an embodiment of the diaphragm valve disclosed herein.

[0031] The diagram is marked as follows:

[0032] Diaphragm connector-1, connecting part-11, support part-12, connecting hole-13, diaphragm body-2, connecting rod-3, valve stem-4, connecting groove-40, fixing part-5, sealing part-6, valve core-7, upper support mating groove-71, lower mating surface-72, connecting rod hole-73, valve body-8, valve cover-9. Detailed Implementation

[0033] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the invention.

[0034] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0035] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and equipment should be considered part of the specification.

[0036] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0037] like Figure 1 As shown, the diaphragm connector 1 provided in this disclosure includes a connecting portion 11 for connecting to a valve stem and a supporting portion 12 for cooperating with a diaphragm. The connecting portion 11 and the supporting portion 12 may have a cylindrical shape. The end faces of both the connecting portion 11 and the supporting portion 12 are arc-shaped surfaces. These arc-shaped surfaces may be circular or elliptical.

[0038] The diaphragm connector 1 is provided with a connection hole 13 for connecting to the diaphragm, and the connection hole 13 extends from the end face of the support portion 12 to the connection portion 11. The connection hole 13 may be, for example, a threaded hole, and the connection between the diaphragm connector 1 and the diaphragm is realized by engaging with the thread of a screw connected to the diaphragm.

[0039] The end faces of the connecting portion 11 and the support portion 12 of the diaphragm connector 1 disclosed herein are both arc-shaped. The arc-shaped end face of the connecting portion 11 makes point contact with the area on the valve stem that mates with the end face of the connecting portion 11. Thus, when the valve stem rotates to close the valve, the diaphragm connector 1 can self-adjust its position relative to the valve stem within a 360° range with a small angle. Furthermore, the arc-shaped end face of the support portion 12 can fit tightly with the diaphragm, ensuring that the diaphragm is subjected to balanced force while closing the diaphragm valve with minimal torque.

[0040] In one embodiment of the diaphragm connector disclosed herein, the end faces of both the connecting portion 11 and the supporting portion 12 are arc-shaped. The arc-shaped end face of the connecting portion 11 facilitates faster and more flexible self-adjustment. The arc-shaped end face of the supporting portion 12 facilitates a tighter fit with the diaphragm.

[0041] like Figure 1 As shown, this disclosure also provides a diaphragm drive mechanism, including a diaphragm, a valve stem 4, a fixing member 5, and a diaphragm connector 1 of this disclosure.

[0042] The diaphragm includes a diaphragm body 2 and a connecting rod 3. The two ends of the connecting rod 3 are connected to the diaphragm body 2 and the connecting hole 13, respectively. The connecting rod 3 may be made of metal and may have a bolt-like structure, with its head connected to the diaphragm body 2.

[0043] The valve stem 4 is provided with a connecting groove 40. The connecting part 11 is located within the connecting groove 40, and the connecting part 11 and the connecting groove 40 are clearance-fitted, so that the connecting part 11 can perform small-angle self-adjustment within the connecting groove 40. The end face of the connecting part 11 is tangent to the bottom surface of the connecting groove 40. The bottom surface of the connecting groove 40 is a plane, so that the contact between the connecting part 11 and the bottom surface of the connecting groove 40 is a point contact.

[0044] The retaining member 5 is used to limit the connecting part 11 within the connecting groove 40. The retaining member 5 should fix the diaphragm connecting member 1 relatively within the connecting groove 40, preventing the diaphragm connecting member 1 from coming out of the connecting groove 40, and should allow the diaphragm connecting member 1 to make small-amplitude positional adjustments within the connecting groove 40 through the fit between the arc-shaped surface and the flat surface, thereby adjusting its position relative to the valve stem 4. The retaining member 5 may be, for example, a retaining pin or a retaining ring.

[0045] The diaphragm drive mechanism disclosed herein is applicable to both manual and pneumatic diaphragm valves, and those skilled in the art can flexibly choose its application field according to actual needs.

[0046] The arc-shaped end face of the connecting part 11 of the diaphragm drive mechanism disclosed herein contacts the bottom surface of the connecting groove 40 of the valve stem 4 at a point, allowing the diaphragm connector 1 to self-adjust its position at a small angle within a 360° range relative to the valve stem. The arc-shaped end face of the support part 12 can achieve a tight fit with the diaphragm, ensuring that the diaphragm is subjected to balanced force while closing the diaphragm valve with minimal torque.

[0047] In one embodiment of the diaphragm drive mechanism disclosed herein, in order to improve the stability of the connection and the ease of assembly, the connecting rod 3 is threadedly connected to the connecting hole 13.

[0048] In one embodiment of the diaphragm drive mechanism disclosed herein, the width of the connecting groove 40 gradually increases along the direction toward the diaphragm body 2, while the outer diameter of the connecting portion 11 remains constant. That is, the connecting groove 40 has a flared shape. This structure of the connecting groove 40 can effectively ensure that the position of the diaphragm connector 1 within the connecting groove 40 is quickly adjusted into place, thereby enabling the diaphragm valve to be closed with minimal torque.

[0049] In one embodiment of the diaphragm drive mechanism disclosed herein, a retaining ring groove is provided on the outer wall of the connecting portion 11, and a retaining ring mating groove is provided on the inner wall of the connecting groove 40. In this embodiment, the fixing member 5 is a retaining ring, and the retaining ring mates with the retaining ring groove and the retaining ring mating groove. The retaining ring has the advantages of low cost and easy assembly and disassembly.

[0050] In one embodiment of the diaphragm drive mechanism disclosed herein, the diaphragm drive mechanism further includes a seal 6. The outer diameter of the support portion 12 is larger than the outer diameter of the connecting portion 11, thereby forming a bent surface at the connection between the support portion 12 and the connecting portion 11. The support portion 12 is provided with a seal positioning groove for positioning the seal 6. The seal 6 is located within the seal positioning groove, and the seal 6 abuts against the end face of the valve stem 4. The seal 6 not only serves a sealing function but also a cushioning function.

[0051] In practice, the seal 6 can be, for example, an O-ring.

[0052] In one embodiment of the diaphragm drive mechanism disclosed herein, the diaphragm drive mechanism further includes a valve core 7, which is located between the diaphragm connector 1 and the diaphragm body 2. The valve core 7 can act as a buffer, which helps to better protect the diaphragm body 2.

[0053] The valve core 7 is provided with an upper support mating groove 71, a lower mating surface 72, and a connecting rod hole 73. The upper support mating groove 71 is adapted to the end face of the support part 12, so that the valve core 7 and the diaphragm connector 1 are tightly fitted together. The lower mating surface 72 is an arc-shaped surface, and the lower mating surface 72 is adapted to the surface of the diaphragm body 2 away from the diaphragm valve, so that the diaphragm body 2 and the valve core 7 are tightly fitted together. The connecting rod hole 73 is fitted with the connecting rod 3.

[0054] Furthermore, in order to better protect the diaphragm body 2, the surface area of ​​the lower mating surface 72 is greater than the surface area of ​​the upper support mating groove 71.

[0055] To more clearly illustrate the diaphragm drive mechanism of this disclosure, the following will use... Figure 1 The following is an example of an embodiment shown in the figure:

[0056] The diaphragm drive mechanism includes a diaphragm connector 1, a diaphragm, a valve stem 4, a fixing component 5, a sealing component 6, and a valve core 7.

[0057] The diaphragm connector 1 includes a connecting portion 11, a supporting portion 12, and a connecting hole 13. The connecting portion 11 has a cylindrical shape. A retaining ring groove is provided on the outer wall of the connecting portion 11. The end faces of both the connecting portion 11 and the supporting portion 12 are arc surfaces. The connecting hole 13 extends from the end face of the supporting portion 12 to the connecting portion 11, and the connecting hole 13 is a threaded hole.

[0058] The diaphragm includes a diaphragm body 2 and a connecting rod 3. The two ends of the connecting rod 3 are connected to the diaphragm body 2 and the connecting hole 13, respectively. The connecting rod 3 is a bolt, and the head of the connecting rod 3 is connected to the diaphragm body 2.

[0059] The valve stem 4 is provided with a connecting groove 40. The connecting part 11 is located inside the connecting groove 40, and the connecting part 11 is clearance-fitted with the connecting groove 40. A retaining ring fitting groove is provided on the inner wall of the connecting groove 40. The bottom surface of the connecting groove 40 is a plane, and the end face of the connecting part 11 is tangent to the bottom surface of the connecting groove 40. The contact between the end face of the connecting part 11 and the bottom surface of the connecting groove 40 is a point contact. The width of the connecting groove 40 gradually increases along the direction toward the diaphragm body 2, while the outer diameter of the connecting part 11 remains unchanged.

[0060] The fastener 5 is a retaining ring, and the retaining ring mates with the retaining ring groove and the retaining ring mating groove to limit the connecting part 11 within the connecting groove 40.

[0061] The seal 6 is an O-ring. The outer diameter of the support portion 12 is larger than the outer diameter of the connecting portion 11, and the support portion 12 is provided with a seal positioning groove for positioning the seal 6. The seal 6 is located in the seal positioning groove, and the seal 6 abuts against the end face of the valve stem 4.

[0062] The valve core 7 is provided with an upper support mating groove 71, a lower mating surface 72, and a connecting rod hole 73. The upper support mating groove 71 is adapted to the end face of the support part 12. The lower mating surface 72 is an arc-shaped surface, and the lower mating surface 72 is adapted to the surface of the diaphragm body 2 away from the diaphragm valve. The surface area of ​​the lower mating surface 72 is larger than the surface area of ​​the upper support mating groove 71. The connecting rod hole 73 mates with the connecting rod 3.

[0063] In this embodiment, the arc-shaped end face of the connecting part 11 of the diaphragm drive mechanism makes point contact with the bottom surface of the connecting groove 40 of the valve stem 4, allowing the diaphragm connector 1 to self-adjust its position within a small angle relative to the valve stem within a 360° range. The arc-shaped end face of the support part 12 can achieve a tight fit with the valve core 7, ensuring that the diaphragm is subjected to balanced force while closing the diaphragm valve with minimal torque.

[0064] like Figure 2 As shown, this disclosure also provides a diaphragm valve, including a valve body 8, a valve cover 9, and a diaphragm actuation mechanism of this disclosure. The diaphragm actuation mechanism is located within the enclosed space formed by the valve body 8 and the valve cover 9. That is, the diaphragm actuation mechanism is enclosed between the valve body 8 and the valve cover 9 and is not exposed. This arrangement helps to improve the safety and stability of the diaphragm valve in use.

[0065] While specific embodiments of the invention have been described in detail by way of examples, those skilled in the art should understand that the examples are for illustrative purposes only and not intended to limit the scope of the invention. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.

Claims

1. A diaphragm drive mechanism, characterized in that, Includes a diaphragm, valve stem, fixing components, and diaphragm connectors; among which, The diaphragm includes a diaphragm body and a connecting rod, with both ends of the connecting rod connected to the diaphragm body and the connecting hole, respectively. The valve stem is provided with a connecting groove, the connecting part is located in the connecting groove, and the connecting part is clearance-fitted with the connecting groove. The end face of the connecting part is tangent to the bottom surface of the connecting groove. The fastener is used to limit the connecting portion within the connecting groove; The diaphragm connector includes a connecting part for connecting to the valve stem and a supporting part for cooperating with the diaphragm, wherein the end faces of the connecting part and the supporting part are both arc-shaped surfaces; The diaphragm connector is provided with a connection hole for connecting to the diaphragm, and the connection hole extends from the end face of the support to the connection. The diaphragm drive mechanism further includes a valve core, which is located between the diaphragm connector and the diaphragm body; The valve core is provided with an upper support mating groove, a lower mating surface and a connecting rod hole. The upper support mating groove is adapted to the end face of the support part. The lower mating surface is an arc-shaped surface and is adapted to the surface of the valve body away from the diaphragm valve. The connecting rod hole is mated with the connecting rod. The connecting rod is threadedly connected to the connecting hole; The width of the connecting groove gradually increases along the direction toward the diaphragm body, while the outer diameter of the connecting part remains unchanged.

2. The diaphragm drive mechanism according to claim 1, characterized in that, The outer wall of the connecting part is provided with a retaining ring groove, and the inner wall of the connecting groove is provided with a retaining ring mating groove; The fastener is a retaining ring, and the retaining ring mates with the retaining ring groove and the retaining ring mating groove.

3. The diaphragm drive mechanism according to claim 1, characterized in that, The diaphragm drive mechanism also includes a seal; The outer diameter of the support portion is larger than the outer diameter of the connecting portion. The support portion is provided with a sealing element positioning groove for positioning the sealing element. The sealing element is located in the sealing element positioning groove and abuts against the end face of the valve stem.

4. The diaphragm drive mechanism according to claim 1, characterized in that, The surface area of ​​the lower mating surface is greater than the surface area of ​​the upper support mating groove.

5. The diaphragm drive mechanism according to claim 1, characterized in that, Both the connecting part and the supporting part have rounded end faces.

6. A diaphragm valve, characterized in that, The device includes a valve body, a valve cover, and a diaphragm drive mechanism as described in any one of claims 1 to 5, wherein the diaphragm drive mechanism is located within the enclosed space formed by the valve body and the valve cover.

Images