A diaphragm valve

Abstract

This utility model relates to the field of industrial fluid control technology and discloses a diaphragm valve, including a valve body shell, a connecting flange, a liquid injection pipe, a valve stem, and a stem head. The connecting flange is fixedly installed on the outer wall of the valve body shell, the liquid injection pipe is fixedly installed on the outer wall of the connecting flange, the valve stem is movably installed inside the valve body shell, the connecting flange, and the liquid injection pipe, and the stem head is fixedly installed at one end of the valve stem. Through the contact between the stem head and the sealing surface of the liquid injection pipe, the liquid can be discharged and cut off. This utility model consists of a fixing block one, a washer one, and a fixing block two. The washer one is clamped between the fixing block one and the fixing block two and is in a slightly compressed state, which can effectively fill the potential gap between the stem head and the sealing surface of the liquid injection pipe, realize the initial sealing and closure of the liquid outlet, and prevent liquid from flowing in through the gap.

Description

Technical Field

[0001] This utility model relates to the field of industrial fluid control technology, and in particular to a diaphragm valve. Background Technology

[0002] Diaphragm valves, as fluid control devices that utilize a flexible diaphragm to isolate the medium from the valve drive components, are widely used in industrial fields such as chemical, pharmaceutical, and food processing, where there are strict requirements for the corrosiveness, purity, and hygiene safety of the media. Their core function is to achieve precise control of fluid flow by having the valve stem contact or separate from the sealing surface of the injection pipe. The sealing performance between the stem head and the sealing surface of the injection pipe directly determines whether the diaphragm valve can effectively prevent liquid leakage and ensure operational stability, making it a crucial aspect in the design and application of diaphragm valves.

[0003] In practical applications of existing diaphragm valves, traditional rod heads often use a single rigid component or a simple sealing design. The seal is not effectively clamped and lacks continuous compression force, making it difficult to completely fill the potential gap between the rod head and the sealing surface of the injection pipe. As a result, when the diaphragm valve is in the closed state, liquid can easily flow into the drive area or the external environment through the above gaps, which not only affects the purity of the medium, but may also corrode the drive components and cause safety hazards.

[0004] Therefore, a diaphragm valve was designed. Utility Model Content

[0005] This utility model addresses the shortcomings of existing technologies by providing a diaphragm valve that solves the problem that traditional diaphragm valves, where the stem head is often a single rigid component or a simple sealing element, are prone to liquid leakage when closed.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: A diaphragm valve includes a valve body shell, a connecting flange, a liquid injection pipe, a valve stem, and a stem head. The connecting flange is fixedly installed on the outer wall of the valve body shell, the liquid injection pipe is fixedly installed on the outer wall of the connecting flange, the valve stem is movably installed inside the valve body shell, the connecting flange, and the liquid injection pipe, and the stem head is fixedly installed at one end of the valve stem. Liquid discharge and cutoff are achieved through the contact between the stem head and the sealing surface of the liquid injection pipe.

[0007] Preferably, the valve body housing further includes a connector, a diaphragm, a piston, and an end cap; the connector is fixedly installed on the outer wall of the valve body housing, the diaphragm is fixedly installed inside the valve body housing, the piston is movably installed inside the valve body housing, and the end cap is snapped onto the end of the valve body housing away from the connecting flange.

[0008] Preferably, the diaphragm is located between the connector and the piston, and the diaphragm is used to separate the drive mechanism and the liquid injection mechanism inside the valve body housing to prevent the drive component from contacting the liquid medium.

[0009] Preferably, the rod head includes a first fixing block, a first washer, and a second fixing block; the first washer is disposed between the first fixing block and the second fixing block to enhance the sealing performance when the rod head contacts the sealing surface of the injection tube.

[0010] Preferably, a connecting rod is fixedly installed on the outer wall of the first fixing block, and the outer wall of the connecting rod is provided with an external thread, which is used to connect the first fixing block and the second fixing block.

[0011] Preferably, the second fixing block is recessed inward on the side facing the first fixing block to form a groove. The shape of the groove is adapted to the shape of the connecting rod, and an internal thread is provided on the inner wall of the groove. The internal thread engages with the external thread on the outer wall of the connecting rod to realize the detachable connection between the second fixing block and the first fixing block.

[0012] Preferably, the outer end of the fixing block one near the fixing block two and the outer end of the fixing block two near the fixing block one are both bent inward to form a bent portion; the edge of the washer one is embedded between the two bent portions, and the two bent portions radially limit the washer one to prevent the washer one from shifting during use.

[0013] Preferably, a second gasket is provided on the side of the injection pipe that contacts the connecting flange. The second gasket is sandwiched between the injection pipe and the connecting flange to enhance the sealing performance of the connection between the injection pipe and the connecting flange and prevent liquid from leaking from this part.

[0014] Preferably, the thickness of the first gasket is adapted to the distance between the first fixing block and the second fixing block, so that the first gasket is in a slightly compressed state after the first fixing block and the second fixing block are connected, thereby further improving the sealing effect.

[0015] Preferably, the end of the piston away from the end cap is fixedly connected to the end of the valve stem away from the stem head. The reciprocating motion of the piston can drive the valve stem to move synchronously along the internal axis of the valve body shell, the connecting flange and the injection pipe, thereby realizing the contact and separation of the stem head and the sealing surface of the injection pipe.

[0016] Compared with the prior art, the present invention has the following beneficial effects: This utility model consists of a fixing block one, a washer one, and a fixing block two. The washer one is clamped between the fixing block one and the fixing block two and is in a slightly compressed state, which can effectively fill the potential gap between the rod head and the sealing surface of the injection tube, realize the initial sealing and closure of the liquid outlet, and prevent liquid from flowing in through the gap.

[0017] If the first gasket loses its sealing performance due to wear or aging, it can be replaced by the threaded connection between the second fixing block and the first fixing block. The operation is simple, thereby restoring the sealing effect between the rod head and the injection pipe when closed, and ensuring the continuous and stable operation of the diaphragm valve. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this utility model, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a front cross-sectional view of the present invention. Figure 3 This utility model Figure 2 A magnified structural diagram of A in the middle; Figure 4 This is an exploded structural diagram of fixing block one, washer one, and fixing block two of this utility model; Figure 5 This is an exploded structural diagram of the rod head of this utility model.

[0020] Drawing number explanation: 1. Valve body shell; 11. Piston; 111. End cap; 12. Diaphragm; 2. Connecting flange; 3. Injection pipe; 4. Valve stem; 40. Stem head; 41. Fixing block one; 411. Connecting rod; 42. Washer one; 43. Fixing block two; 5. Washer two; 6. Connector. Detailed Implementation

[0021] The present invention will now be described in further detail with reference to the accompanying drawings.

[0022] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious modifications will be apparent to those skilled in the art. The basic principles of the present invention defined in the following description can be used in other embodiments, modifications, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0023] Those skilled in the art should understand that in the disclosure of this utility model, the terms "longitudinal", "lateral", "up", "down", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or position based on the orientation or positional relationship shown in the accompanying drawings. They are only for the purpose of simplifying the description of this utility model and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as a limitation of this utility model.

[0024] It is understood that the term "a" should be understood as "at least one" or "one or more," that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple, and the term "a" should not be understood as a limitation on the number.

[0025] Example 1: Please see Figure 1-5 A diaphragm valve includes a valve body shell 1, a connecting flange 2, a liquid injection pipe 3, a valve stem 4, and a stem head 40. The connecting flange 2 is fixedly installed on the outer wall of the valve body shell 1, the liquid injection pipe 3 is fixedly installed on the outer wall of the connecting flange 2, the valve stem 4 is movably installed inside the valve body shell 1, the connecting flange 2, and the liquid injection pipe 3, and the stem head 40 is fixedly installed at one end of the valve stem 4. Liquid discharge and cut-off are achieved through the contact between the stem head 40 and the sealing surface of the liquid injection pipe 3.

[0026] The valve body housing 1 also includes a connector 6, a diaphragm 12, a piston 11, and an end cap 111; the connector 6 is fixedly installed on the outer wall of the valve body housing 1, the diaphragm 12 is fixedly installed inside the valve body housing 1, the piston 11 is movably installed inside the valve body housing 1, and the end cap 111 is snapped onto the end of the valve body housing 1 away from the connecting flange 2.

[0027] The diaphragm 12 is located between the connector 6 and the piston 11. The diaphragm 12 is used to separate the drive mechanism and the liquid injection mechanism inside the valve body housing 1 to prevent the drive components from contacting the liquid medium.

[0028] The rod head 40 includes a first fixing block 41, a first washer 42, and a second fixing block 43; the first washer 42 is disposed between the first fixing block 41 and the second fixing block 43 to enhance the sealing performance when the rod head 40 contacts the sealing surface of the injection tube 3.

[0029] A connecting rod 411 is fixedly installed on the outer wall of the first fixing block 41. The outer wall of the connecting rod 411 is provided with an external thread, which is used to connect the first fixing block 41 and the second fixing block 43.

[0030] The second fixing block 43 is recessed inward on the side facing the first fixing block 41 to form a groove. The shape of the groove is adapted to the shape of the connecting rod 411, and an internal thread is provided on the inner wall of the groove. The internal thread cooperates with the external thread on the outer wall of the connecting rod 411 to realize the detachable connection between the second fixing block 43 and the first fixing block 41.

[0031] The outer ends of fixing block 41 near fixing block 43 and the outer ends of fixing block 43 near fixing block 41 are both bent inward to form a bent portion; the edge of washer 42 is embedded between the two bent portions, and the two bent portions radially limit washer 42 to prevent washer 42 from shifting during use.

[0032] A second gasket 5 is provided on the side of the injection pipe 3 that contacts the connecting flange 2. The second gasket 5 is sandwiched between the injection pipe 3 and the connecting flange 2 to enhance the sealing performance of the connection between the injection pipe 3 and the connecting flange 2 and prevent liquid from leaking from this part.

[0033] The thickness of gasket 42 is matched with the distance between fixing block 41 and fixing block 43, so that gasket 42 is in a slightly compressed state after fixing block 41 and fixing block 43 are connected, which further improves the sealing effect.

[0034] The end of piston 11 away from end cap 111 is fixedly connected to the end of valve stem 4 away from stem head 40. The reciprocating motion of piston 11 can drive valve stem 4 to move synchronously along the internal axis of valve body shell 1, connecting flange 2 and injection pipe 3, thereby realizing the contact and separation of stem head 40 and sealing surface of injection pipe 3.

[0035] When the diaphragm valve is not activated, the spring pushes the piston 11 inside the valve body housing 1 forward along the valve body axis until the piston 11 stops after hitting the limit block. The valve stem 4, fixedly connected to the end of the piston 11 away from the end cap 111, moves forward synchronously, causing the stem head 40 at one end of the valve stem 4 to tightly fit against the sealing surface of the injection pipe 3. The stem head 40 consists of a first fixing block 41, a first washer 42, and a second fixing block 43. The second fixing block 43 is threadedly connected to the connecting rod 411 on the outer wall of the first fixing block 41 via an inner wall thread, clamping the first washer 42 between the first fixing block 41 and the second fixing block 43, with the washer 42 directly contacting the sealing surface of the injection pipe 3. At this time, the washer 42 is slightly compressed due to the clamping force of the first fixing block 41 and the second fixing block 43, completely filling any potential gaps between the stem head 40 and the sealing surface of the injection pipe 3, preventing liquid from flowing in through the gaps and achieving initial sealing closure of the outlet.

[0036] When the diaphragm valve is started, external liquid is injected into the injection area inside the valve body housing 1 through the connector 6 fixed to the outer wall of the valve body housing 1. During this process, the diaphragm 12 inside the valve body housing 1 always isolates the piston 11 side of the drive mechanism from the connector 6 and the injection pipe 3 side of the injection mechanism, preventing the drive components from contacting the liquid; at the same time, the washer 42 of the rod head 40 is continuously in contact with the sealing surface of the injection pipe 3 to maintain a sealed state, ensuring that the injected liquid is stored only in the injection area and does not leak or flow into the drive area through the gap between the rod head 40 and the injection pipe 3. The liquid is continuously injected until the preset time is completed, and the injection preparation is completed.

[0037] After the liquid injection reaches the set time, the gas source connector 6 injects gas into the drive area inside the valve body shell 1. The gas pressure pushes the piston 11 against the spring force, causing it to move backward along the inside of the valve body shell 1 towards the end cover 111. The valve stem 4, fixedly connected to the piston 11, moves backward synchronously, causing the stem head 40 (including fixing block 41, washer 42, and fixing block 43) to separate from the sealing surface of the injection pipe 3, opening the outlet of the injection pipe 3. The liquid inside the valve body shell 1 then passes through the inner channel of the connecting flange 2 and the injection pipe 3, exiting from the outlet of the injection pipe 3 and entering the subsequent process flow.

[0038] After the injection process is completed, the gas source connector 6 stops injecting gas and discharges the gas in the drive area, reducing the pressure in the drive area to its initial state. The spring returns to its original deformation, pushing the piston 11 forward. The valve stem 4 drives the rod head 40 forward synchronously until the washer 42 of the rod head 40 is once again tightly fitted to the sealing surface of the injection pipe 3. At this time, the washer 42, with its own elasticity and the clamping force of the fixing block 41 and the fixing block 43, fills the gap between the rod head 40 and the injection pipe 3 again, ensuring that liquid will not flow in through the gap, and the outlet of the injection pipe 3 is closed. The piston 11 touches the limit block again, and the diaphragm valve returns to its initial zero position, waiting for the next start command.

[0039] If, after prolonged use, washer 42 loses its sealing performance due to wear and aging, and liquid leaks from the gap between rod head 40 and injection pipe 3, it can be replaced through the threaded connection between fixing block 2 43 and fixing block 1 41: rotate fixing block 2 43 so that it unscrews along the external thread of fixing block 1 41 connecting rod 411, releasing the clamping of washer 42; remove the failed washer 42, replace it with a new washer 42, and then reconnect fixing block 2 43 and fixing block 1 41 by thread and tighten it, so that the new washer 42 is back in the clamping state, ensuring the sealing effect when rod head 40 and injection pipe 3 are closed, and ensuring the continuous and stable operation of the diaphragm valve.

[0040] Those skilled in the art should understand that the embodiments of the present invention described above and shown in the accompanying drawings are merely examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functions and structural principles of the present invention have been shown and explained in the embodiments. Without departing from the stated principles, the implementation of the present invention may have any variations or modifications.

Claims

1. A diaphragm valve, characterized in that: The valve includes a valve body shell (1), a connecting flange (2), an injection pipe (3), a valve stem (4), and a stem head (40). The connecting flange (2) is fixedly installed on the outer wall of the valve body shell (1), the injection pipe (3) is fixedly installed on the outer wall of the connecting flange (2), the valve stem (4) is movably installed inside the valve body shell (1), the connecting flange (2), and the injection pipe (3), and the stem head (40) is fixedly installed at one end of the valve stem (4). The liquid is discharged and cut off through the contact between the stem head (40) and the sealing surface of the injection pipe (3).

2. A diaphragm valve according to claim 1, characterized in that: The valve body housing (1) also includes a connector (6), a diaphragm (12), a piston (11), and an end cap (111); the connector (6) is fixedly installed on the outer wall of the valve body housing (1), the diaphragm (12) is fixedly installed inside the valve body housing (1), the piston (11) is movably installed inside the valve body housing (1), and the end cap (111) is snapped onto one end of the valve body housing (1) away from the connecting flange (2).

3. A diaphragm valve according to claim 2, characterized in that: The diaphragm (12) is located between the connector (6) and the piston (11), and the diaphragm (12) is used to separate the drive mechanism and the injection mechanism inside the valve body housing (1).

4. A diaphragm valve according to claim 1, characterized in that: The rod head (40) includes a first fixing block (41), a first washer (42) and a second fixing block (43); the first washer (42) is disposed between the first fixing block (41) and the second fixing block (43).

5. A diaphragm valve according to claim 4, characterized in that: A connecting rod (411) is fixedly installed on the outer wall of the fixing block (41), and the connecting rod (411) has an external thread on its outer wall.

6. A diaphragm valve according to claim 5, characterized in that: The second fixing block (43) is recessed inward on the side facing the first fixing block (41) to form a groove. The shape of the groove is adapted to the shape of the connecting rod (411). The inner wall of the groove is provided with an internal thread. The internal thread cooperates with the external thread on the outer wall of the connecting rod (411) to realize the detachable connection between the second fixing block (43) and the first fixing block (41).

7. A diaphragm valve according to claim 6, characterized in that: The outer end of the fixing block one (41) near the fixing block two (43) and the outer end of the fixing block two (43) near the fixing block one (41) are both bent inward to form a bent part; the edge of the washer one (42) is embedded between the two bent parts.

8. A diaphragm valve according to claim 1, characterized in that: A second gasket (5) is provided on the side of the injection pipe (3) that contacts the connecting flange (2), and the second gasket (5) is sandwiched between the injection pipe (3) and the connecting flange (2).

9. A diaphragm valve according to claim 4, characterized in that: The thickness of the first washer (42) is adapted to the distance between the first fixing block (41) and the second fixing block (43), so that the first washer (42) is in a slightly compressed state after the first fixing block (41) and the second fixing block (43) are connected.

10. A diaphragm valve according to claim 2, characterized in that: The piston (11) is fixedly connected at one end away from the end cap (111) to the valve stem (4) at the other end away from the stem head (40). The reciprocating motion of the piston (11) can drive the valve stem (4) to move synchronously along the internal axis of the valve body shell (1), the connecting flange (2) and the injection pipe (3).

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