A diaphragm valve

Abstract

This utility model discloses a diaphragm valve, including a valve body and: a valve cover, which is fixedly disposed on the upper end of the valve body, the valve cover being divided into a first part, a second part, and a third part from top to bottom; a diaphragm, which is located between the valve body and the valve cover, used for opening and closing the pipeline of the valve body, the upper end of the diaphragm abutting against the third part of the valve cover, and the lower end of the diaphragm abutting against the valve body; a first connecting assembly, the second part and the third part of the valve cover being connected through the first connecting assembly; and a second connecting assembly, the first part and the second part of the valve cover being connected through the second connecting assembly; wherein, the valve body is provided with a plurality of threaded holes, and the first part, the second part, the third part, and the diaphragm are all provided with through holes corresponding to the threaded holes, reducing the difficulty of parts inspection and replacement, and enabling targeted maintenance through multi-part disassembly, reducing unnecessary disassembly steps and improving maintenance efficiency.

Description

Technical Field

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

[0002] Pneumatic diaphragm valves are important components in pipeline transportation. The diaphragm used for opening and closing separates the valve body cavity from the valve cover cavity and drive components, protecting the parts located above the diaphragm from media corrosion.

[0003] However, some parts of the diaphragm valve are prone to wear after long-term use, which affects the performance. The valve cover of the diaphragm valve is usually molded as one piece, which is more troublesome to disassemble. The valve cover and internal parts need to be removed to replace the diaphragm, and repeated disassembly can also easily lead to loosening of the seal. Summary of the Invention

[0004] To solve the above-mentioned technical problems, this utility model provides the following technical solution: a diaphragm valve, including a valve body, and further comprising: The valve cover is fixedly installed on the upper end of the valve body. The valve cover is divided into a first part, a second part and a third part from top to bottom. A diaphragm, located between the valve body and the valve cover, is used to open and close the pipeline of the valve body. The upper end of the diaphragm abuts against the third part of the valve cover, and the lower end of the diaphragm abuts against the valve body. A first connecting assembly is used to connect the second and third parts of the valve cover; The second connecting assembly is used to connect the first part and the second part of the valve cover; The valve body has several threaded holes, and the first part, the second part, the third part, and the diaphragm all have through holes corresponding to the threaded holes.

[0005] Furthermore, the first connection component includes: A connecting sleeve is fixedly installed at the lower end of the second part; The upper end of the third part has a connecting hole that matches the connecting sleeve.

[0006] Furthermore, it also includes: The valve stem is movable up and down within the second part of the valve cover; A connecting post is fixedly installed at the upper end of the diaphragm, and the upper end of the connecting post passes through the third part and is threadedly connected to the lower end of the valve stem.

[0007] The axes of the connecting sleeve, connecting hole, valve stem, and connecting column are coaxial.

[0008] Furthermore, the second connection component includes: Mounting sleeve, the lower end of the first part has a mounting sleeve; Mounting hole, the upper end of the second part is provided with a mounting hole that matches the mounting sleeve; The mounting sleeve has several locking blocks that are circumferentially spaced and fixedly arranged on its outer periphery. The mounting hole has several circumferentially spaced locking blocks fixedly arranged on its inner wall. Wherein, the width of the card block is less than the interval between two adjacent locking blocks, and the width of the locking block is less than the interval between two adjacent card blocks. After the first part and the second part are installed, the locking block is located below the card block.

[0009] Furthermore, it also includes: A locking sleeve is fixedly installed on the outside of the valve body, and the locking sleeve is inclined. A guide sleeve is fixedly disposed on the outside of the third part, and the inner hole of the guide sleeve corresponds to the inner hole of the locking sleeve. A pin that passes through a guide sleeve and is inserted into a locking sleeve.

[0010] Furthermore, the through hole in the first part is a countersunk hole.

[0011] Furthermore, the first part, the second part, and the third part are sealed together.

[0012] The beneficial effects of this utility model are as follows: 1. It reduces the difficulty of parts inspection and replacement, and enables targeted maintenance through multi-part disassembly, reducing unnecessary disassembly steps and improving maintenance efficiency.

[0013] 2. It improved the assembly accuracy of the second and third parts, avoiding component wear caused by assembly misalignment, while reducing the adjustment time for through hole alignment, improving assembly efficiency, and achieving a certain positioning effect.

[0014] 3. It enables quick disassembly of the valve stem and connecting column without disassembling the third part and diaphragm, further simplifying the maintenance process; at the same time, by replacing spare parts, it solves the problem of excessive downtime caused by traditional maintenance, and improves equipment utilization.

[0015] 4. It achieves tool-free quick connection and locking between the first and second parts. Compared with traditional threaded connections, it eliminates the need for repeated rotation, making operation more convenient. At the same time, the axial limiting structure is stable and can effectively prevent the first part from loosening due to vibration, thus improving connection reliability. Attached Figure Description

[0016] Appendix Figure 1 This is a structural diagram of the present invention; Appendix Figure 2This is a cross-sectional view of the present invention; Appendix Figure 3 This is a breakdown diagram of the first, second, and third parts; Appendix Figure 4 For the appendix Figure 3 Side view; Appendix Figure 5 This is an inverted diagram of the first part; Appendix Figure 6 This is a schematic diagram showing the separation of the diaphragm and the valve body; Appendix Figure 7 A schematic diagram showing the locking sleeve, guide sleeve, and pin for the valve body and the third part; Explanation of reference numerals in the attached drawings: 1. Valve body, 2. Valve cover, 3. First part, 4. Second part, 5. Third part, 6. Diaphragm, 7. Threaded hole, 8. Through hole, 9. Connecting sleeve, 10. Connecting hole, 11. Valve stem, 12. Connecting column, 13. Mounting sleeve, 14. Mounting hole, 15. Locking block, 16. Locking block, 17. Locking sleeve, 18. Guide sleeve, 19. Pin. Detailed Implementation

[0017] The technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In the description of this application, it should be noted that the terminology used herein is only for describing specific implementations and is not intended to limit the exemplary implementations according to this application. For ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all 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. It should be noted that similar reference numerals and letters in the following drawings indicate similar items, and therefore, once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings. Example 1

[0018] This embodiment provides a diaphragm valve, including a valve body 1, and further comprising: Valve cover 2 is fixedly installed on the upper end of valve body 1. Valve cover 2 is divided into a first part 3, a second part 4 and a third part 5 from top to bottom. A diaphragm 6 is located between the valve body 1 and the valve cover 2 and is used to open and close the pipeline of the valve body 1. The upper end of the diaphragm 6 abuts against the third part 5 of the valve cover 2, and the lower end of the diaphragm 6 abuts against the valve body 1. The second part 4 and the third part 5 of the valve cover 2 are connected by the first connecting assembly; The first part 3 and the second part 4 of the valve cover 2 are connected by the second connecting assembly; The valve body 1 has several threaded holes 7, and the first part 3, the second part 4, the third part 5 and the diaphragm 6 all have through holes 8 corresponding to the threaded holes 7.

[0019] In this technical solution, during installation, the bolts pass through the through holes 8 of the first part 3, the second part 4, the third part 5 and the diaphragm 6 from top to bottom, and are threadedly connected to the threaded hole 7 of the bottom valve body 1. The whole is fixed by the clamping force of the bolts. Traditional diaphragm valve covers 2 are integrally molded and require complete disassembly. However, this solution divides the valve cover 2 into three parts, which can be fixed as a whole by bolts passing through the through holes 8 of each part and the threaded holes 7 of the valve body 1. At the same time, a certain part can be disassembled individually according to maintenance needs (such as disassembling only the first and second parts to inspect the valve stem 11, or disassembling the third part 5 to inspect the diaphragm 6), without the need for complete disassembly.

[0020] The diaphragm 6 is sandwiched between the valve body 1 and the third part 5. The seal is ensured by the contact force of the third part 5. When the diaphragm 6 is worn, the valve cover 2 can be removed as a whole to replace the diaphragm 6 without disassembling the internal parts of the valve cover 2. Therefore, the sealing connection of the internal parts of the valve cover 2 will not be affected when replacing the diaphragm 6, making the operation more flexible.

[0021] This structural design effectively solves the problems in the background technology, reduces the difficulty of parts inspection and replacement, and enables targeted maintenance through multi-part disassembly, reducing unnecessary disassembly steps and improving maintenance efficiency. Example 2

[0022] This embodiment provides a diaphragm valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0023] Furthermore, the first connection component includes: Connecting sleeve 9 is fixedly installed at the lower end of the second part 4; Connection hole 10: The upper end of the third part 5 is provided with a connection hole 10 that matches the connecting sleeve 9.

[0024] In this technical solution, a sealing ring is provided on the outer side of the connecting sleeve 9 to ensure that the connecting sleeve 9 can be sealed after being inserted into the connecting hole 10. When the second part 4 and the third part 5 are assembled, the connecting sleeve 9 can be inserted into the connecting hole 10 to achieve pre-positioning. Then, the second part 4 is rotated to ensure that the through hole 8 of the second part 4 and the third part 5 are precisely aligned to avoid the bolts being unable to be installed smoothly due to misalignment of the through hole 8. This structural design improves the assembly accuracy of the second part 4 and the third part 5, avoids component wear caused by assembly misalignment, reduces the adjustment time for aligning the through holes 8, improves assembly efficiency, and achieves a certain positioning effect. Example 3

[0025] This embodiment provides a diaphragm valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0026] Furthermore, it also includes: The valve stem 11 is movable up and down within the second part 4 of the valve cover 2; The connecting post 12 is fixedly installed at the upper end of the diaphragm 6, and the upper end of the connecting post 12 passes through the third part 5 and is threadedly connected to the lower end of the valve stem 11.

[0027] The axes of the connecting sleeve 9, connecting hole 10, valve stem 11, and connecting column 12 are coaxial.

[0028] In this technical solution, the second part 4 is provided with a structure to prevent the valve stem 11 from rotating (such as a protrusion on the outer periphery of the valve stem 11 and a corresponding groove on the inner wall of the second part 4, which is the prior art and will not be described in detail here). At the same time, as shown in the figure, the diaphragm 6 is square, and a square groove for placing the diaphragm 6 is opened on the top of the valve body 1, thereby restricting the rotation of the diaphragm 6.

[0029] If the parts in the second part 4 and the first part 3 (such as the valve stem 11 seal) need to be replaced, first unscrew the bolts connecting each part to the valve body 1, hold the third part 5 still, and then rotate the first part 3 and the second part 4 to rotate the valve stem 11, which will contact the threaded connection between the valve stem 11 and the connecting column 12, so that the first part 3 and the second part 4 can be taken out directly, which is convenient for the parts in the first part 3 and the second part 4 to be inspected.

[0030] Meanwhile, spare first part 3 and second part 4 can be pre-assembled and installed directly after replacement. After disassembling the original first part 3 and second part 4, the spare first part 3 and second part 4 can be installed first, and then the disassembled first part 3 and second part 4 can be replaced and used in the next replacement, reducing downtime.

[0031] This structural design enables quick disassembly of the valve stem 11 and the connecting column 12 without disassembling the third part 5 and the diaphragm 6, further simplifying the maintenance process. At the same time, by replacing spare parts, the problem of excessive downtime caused by traditional maintenance is solved, improving equipment utilization. Example 4

[0032] This embodiment provides a diaphragm valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0033] Furthermore, the second connection component includes: Mounting sleeve 13, the lower end of the first part 3 has mounting sleeve 13; Mounting hole 14, the upper end of the second part 4 is provided with mounting hole 14 that matches the mounting sleeve 13; Locking block 15: Several locking blocks 15 are fixedly arranged circumferentially around the outer periphery of the mounting sleeve 13. The inner wall of the mounting hole 14 is fixedly provided with a plurality of circumferentially spaced locking blocks 16; Wherein, the width of the card block 16 is smaller than the interval between two adjacent locking blocks 15, and the width of the locking block 15 is smaller than the interval between two adjacent card blocks 16. After the first part 3 and the second part 4 are installed, the locking block 15 is located below the card block 16.

[0034] In this technical solution, when assembling the first part 3 and the second part 4, the mounting sleeve 13 is first inserted into the mounting hole 14. At this time, the locking block 16 needs to be aligned with the gap between two adjacent locking blocks 15. Since the width of the locking block 16 is smaller than the gap between the locking blocks 15, it can be inserted smoothly. After insertion, rotate the first part 3 clockwise or counterclockwise to move the locking block 15 to the position corresponding to the latch block 16, so that the locking block 15 is located below the latch block 16 after rotation. The latch block 16 can axially limit the locking block 15 to prevent the first part 3 from falling upward. When disassembling, simply rotate the first part 3 in the opposite direction to return the locking block 15 to the interval of the latch block 16, and the first part 3 can be pulled out.

[0035] At the same time, it facilitates the removal of the first part 3 and the second part 4 in the manner shown in Embodiment 3, making the connection between the first part 3 and the second part 4 less likely to loosen.

[0036] This structural design enables tool-free quick connection and locking of the first part 3 and the second part 4. Compared with traditional threaded connections, it eliminates the need for repeated rotation and makes operation more convenient. At the same time, the axial limiting structure is stable and can effectively prevent the first part 3 from loosening due to vibration, thus improving the reliability of the connection. Example 5

[0037] This embodiment provides a diaphragm valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0038] Furthermore, it also includes: Locking sleeve 17 is fixedly disposed on the outside of valve body 1, and the locking sleeve 17 is disposed at an angle; Guide sleeve 18 is fixedly disposed on the outside of the third part 5, and the inner hole of guide sleeve 18 corresponds to the inner hole of locking sleeve 17. Pin 19 passes through guide sleeve 18 and is inserted into locking sleeve 17.

[0039] In this technical solution, both the locking sleeve 17 and the guide sleeve 18 are cylindrical structures with inner diameters that match the pin 19. Both the locking sleeve 17 and the guide sleeve 18 are inclined, so that the pin 19, after being inserted at an angle, will conflict with the vertical movement of the third part 5, thereby preventing the third part 5 from moving up and down and also providing a certain anti-loosening effect, which improves the sealing effect of the diaphragm 6. The pin 19 can position the third part 5 and the valve body 1 so that the third part 5 will not detach from the valve body 1 when the first part 3 and the second part 4 are removed in the manner shown in Embodiment 3.

[0040] Meanwhile, the pin 19 can be configured as a threaded post, and the guide sleeve 18 can have a threaded hole, further improving the connection stability.

[0041] This structural design improves the stability of the connection between the third part 5 and the valve body 1, making it particularly suitable for industrial scenarios with frequent vibrations. It also stabilizes the third part 5 when disassembling the first part 3 and the second part 4. Example 6

[0042] This embodiment provides a diaphragm valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0043] Furthermore, the through hole 8 in the first part 3 is a countersunk hole.

[0044] In this technical solution, the diameter of the countersunk hole is larger than the main diameter of the through hole 8. During assembly, the head of the bolt can be fully embedded in the countersunk hole and will not protrude from the upper surface of the first part 3, which is more aesthetically pleasing.

[0045] This structural design avoids interference problems caused by protruding bolt heads (such as when there are other pipes or equipment around the diaphragm valve, there will be no collision due to the protruding bolts). In addition, the embedded bolt heads can prevent bolt loosening caused by accidental external contact, thus improving connection stability. Example 7

[0046] This embodiment provides a diaphragm valve, which, in addition to the technical solutions of the above embodiments, also has the following technical features.

[0047] Furthermore, the first part 3, the second part 4, and the third part 5 are sealed together.

[0048] In this technical solution, the contact surfaces of the first part 3 and the second part 4, and the contact surfaces of the second part 4 and the third part 5, are all provided with annular sealing grooves. O-rings are embedded in the sealing grooves (the material is selected according to the characteristics of the medium, such as nitrile rubber for oil-resistant media and fluororubber for corrosion-resistant media). When each part is fixed by bolts or locked by connecting components, the contact surfaces will squeeze the O-rings, causing the sealing rings to undergo elastic deformation, filling the tiny gaps in the contact surfaces, and achieving a seal.

[0049] This structural design effectively prevents media leakage from the contact surfaces of various parts of the valve cover 2, avoiding a decrease in pipeline transportation efficiency or media contamination due to seal failure. At the same time, the O-ring seal is easy to replace; when the sealing performance deteriorates, only the corresponding part needs to be disassembled for replacement, resulting in low maintenance costs.

[0050] The embodiments of this application have been described above with reference to the accompanying drawings. Unless otherwise specified, the embodiments and features described in this application specification can be combined with each other. This application is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of this application without departing from the spirit and scope of the claims, and all of these forms are within the protection scope of this application.

Claims

1. A diaphragm valve, comprising a valve body (1), characterized in that, Also includes: The valve cover (2) is fixedly installed on the upper end of the valve body (1). The valve cover (2) is divided into a first part (3), a second part (4) and a third part (5) from top to bottom. A diaphragm (6) is located between the valve body (1) and the valve cover (2) and is used to open and close the pipeline of the valve body (1). The upper end of the diaphragm (6) abuts against the third part (5) of the valve cover (2) and the lower end of the diaphragm (6) abuts against the valve body (1). The second part (4) and the third part (5) of the valve cover (2) are connected by the first connecting assembly; The second connecting assembly is used to connect the first part (3) and the second part (4) of the valve cover (2); The valve body (1) has several threaded holes (7), and the first part (3), the second part (4), the third part (5) and the diaphragm (6) all have through holes (8) corresponding to the threaded holes (7).

2. A diaphragm valve according to claim 1, characterized in that, The first connection component includes: Connecting sleeve (9), which is fixedly installed at the lower end of the second part (4); Connection hole (10): The upper end of the third part (5) is provided with a connection hole (10) that matches the connecting sleeve (9).

3. A diaphragm valve according to claim 2, characterized in that, Also includes: The valve stem (11) is movable up and down within the second part (4) of the valve cover (2); A connecting post (12) is fixedly installed at the upper end of the diaphragm (6), and the upper end of the connecting post (12) passes through the third part (5) and is threadedly connected to the lower end of the valve stem (11). The axes of the connecting sleeve (9), connecting hole (10), valve stem (11) and connecting column (12) are coaxial.

4. A diaphragm valve according to claim 3, characterized in that, The second connection component includes: Mounting sleeve (13), the lower end of the first part (3) has mounting sleeve (13); Mounting hole (14), the upper end of the second part (4) is provided with mounting hole (14) that matches the mounting sleeve (13). Locking blocks (15): Several locking blocks (15) are fixedly arranged circumferentially on the outer periphery of the mounting sleeve (13). The inner wall of the mounting hole (14) is fixedly provided with a number of circumferentially spaced locking blocks (16). Wherein, the width of the card block (16) is less than the interval between two adjacent locking blocks (15), the width of the locking block (15) is less than the interval between two adjacent card blocks (16), and after the first part (3) and the second part (4) are installed, the locking block (15) is located below the card block (16).

5. A diaphragm valve according to claim 4, characterized in that, Also includes: A locking sleeve (17) is fixedly disposed on the outside of the valve body (1), and the locking sleeve (17) is disposed at an angle; A guide sleeve (18) is fixedly disposed on the outside of the third part (5), and the inner hole of the guide sleeve (18) corresponds to the inner hole of the locking sleeve (17). A pin (19) passes through a guide sleeve (18) and is inserted into a locking sleeve (17).

6. A diaphragm valve according to claim 5, characterized in that: The through hole (8) of the first part (3) is a countersunk hole.

7. A diaphragm valve according to claim 6, characterized in that: The first part (3), the second part (4) and the third part (5) are sealed together.

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