Pneumatic fluorine-lined diaphragm valve

Abstract

The utility model relates to diaphragm valve technical field, and disclose a kind of fluorine lining diaphragm valve of pneumatic, including valve body, the inside of valve body is shaped with valve chamber and at least two passageways connecting the valve chamber, the diaphragm assembly for closing the valve chamber is installed on the valve body, the valve core for being inserted in the diaphragm assembly for pushing the deformation of diaphragm assembly, the diaphragm assembly includes isolation layer, the central portion of isolation layer is provided with flexible member, the end surface structure of flexible member is the curved surface structure of upward bulge, the bottom of isolation layer is provided with sealing layer, the central portion of sealing layer is provided with fluoroplastic that is in line with flexible member, the spring piece that keeps it and flexible member abuttingly fitted is installed on fluoroplastic, in the utility model, fluoroplastic is maintained by spring piece, so that fluoroplastic and flexible member abuttingly fitted, to avoid its mechanical fatigue, resulting in valve opening fatigue diaphragm can oscillate with water flow problem.

Description

Technical Field

[0001] This utility model relates to the field of diaphragm valve technology, specifically a pneumatic fluoropolymer-lined diaphragm valve. Background Technology

[0002] A diaphragm valve is a shut-off valve that uses a diaphragm as the opening and closing element to close the flow path, cut off the fluid, and separate the valve body cavity from the valve cover cavity. The diaphragm is usually made of elastic, corrosion-resistant, and non-permeable materials such as rubber and plastic. The valve body is mostly made of plastic, fiberglass, ceramic, or metal lined with rubber. It has a simple structure, good sealing and corrosion resistance, and low fluid resistance. It is used for low-pressure, low-temperature, highly corrosive, and media containing suspended matter.

[0003] Currently, the diaphragms of existing diaphragm valves have poor aging resistance due to the high polymer materials used. Diaphragms made from these materials are prone to aging and damage. When the diaphragm becomes weak, the elastic part of the diaphragm cannot deform in time with the movement of the valve core, and it is suspended in the middle of the valve chamber (i.e., it is not attached to the valve chamber or the bottom of the valve core). When water flows through, it will vibrate between the valve chamber and the valve core due to the impact of the water flow. Especially when the water pressure is unstable, the vibration caused by this impact can easily cause the diaphragm to tear and break, leading to diaphragm valve failure.

[0004] Therefore, since it does not meet the existing requirements, we propose a pneumatic fluoropolymer-lined diaphragm valve. Utility Model Content

[0005] This invention provides a pneumatic fluoropolymer-lined diaphragm valve, which has the advantages of strong fatigue resistance, long service life and low maintenance cost, and solves the problems mentioned in the background art.

[0006] This utility model provides the following technical solution: a pneumatic fluoropolymer-lined diaphragm valve, comprising a valve body, wherein the valve body has a valve chamber formed inside and at least two passages communicating with the valve chamber, a diaphragm assembly for closing the valve chamber is installed on the valve body, a valve core for pushing the diaphragm assembly to deform is inserted inside the diaphragm assembly, the diaphragm assembly includes an isolation layer, a flexible element is disposed in the center of the isolation layer, the end face structure of the flexible element is an upwardly convex curved surface structure, a sealing layer is disposed at the bottom of the isolation layer, a fluoroplastic that fits against the flexible element is disposed in the center of the sealing layer, a spring is installed on the fluoroplastic to keep it in contact with the flexible element, and the flexible element and the fluoroplastic deform under force to seal and close the valve chamber.

[0007] Preferably, a partition plate is provided in the valve chamber, and a communication gap is provided between the partition plate and the diaphragm assembly. The valve core is located directly above the diaphragm assembly, and the valve core uses the flexible member to seal the fluoroplastic against the top of the partition plate to close the communication gap.

[0008] Preferably, the spring clip is fitted between the inner walls of the sealing layer, and the bottom of the spring clip is provided with a connecting foot for connecting the sealing layer along its length direction. The connecting foot is inserted into the fluoroplastic. The spring clip maintains the end face structure of the fluoroplastic through its own elasticity. The spring clip is located between the fluoroplastic and the flexible component. The abutting and fitting fluoroplastic and flexible component can also play a certain role in isolating and protecting the spring clip to avoid corrosion and rust caused by the medium.

[0009] Preferably, the two opposite ends of the spring are provided with semi-circular feet to avoid squeezing the edge structure of the fluoroplastic. The semi-circular feet at both ends of the spring can prevent the edge of the fluoroplastic from being squeezed during repeated deformation, thus preventing the edge of the fluoroplastic from breaking.

[0010] Preferably, the valve core includes a valve cover, which is fastened to the top of the isolation layer. A mandrel is inserted into the valve cover, and a mandrel tongue is provided at the bottom of the mandrel for pushing the diaphragm assembly to close the valve chamber. A detachable connection structure is provided between the flexible member and the mandrel tongue.

[0011] Preferably, the valve cover, the isolation layer, and the sealing layer are stacked in sequence and then fixed to the valve body with bolts.

[0012] Preferably, the valve body is further provided with a pneumatic drive device for driving the valve core.

[0013] This utility model has the following beneficial effects:

[0014] 1. In this utility model, a double-layer diaphragm assembly is adopted, in which the isolation layer bears the pressure of the valve core and the sealing layer bears the impact force of water flow and the sealing function. Compared with the existing single-layer reinforcement, the double-layer diaphragm assembly can avoid the problem of a single-layer diaphragm bearing both water flow pressure and sealing pressure at the same time, which leads to a shorter service life.

[0015] 2. In this utility model, a spring sheet is used to hold the fluoroplastic so that the fluoroplastic and the flexible part are in contact and fit together, thereby avoiding mechanical fatigue and the problem that the fatigued fluoroplastic diaphragm will vibrate with the water flow when the valve is opened.

[0016] 3. In this utility model, the spring sheet restores the fluoroplastic by its own elasticity, thus reducing the flexibility requirements of the fluoroplastic. Moreover, the isolation layer and sealing layer can be replaced individually by disassembling the diaphragm assembly, thereby reducing maintenance costs. Attached Figure Description

[0017] Figure 1 This is a three-dimensional structural diagram of the valve body of this utility model;

[0018] Figure 2 This is a three-dimensional structural diagram of the diaphragm assembly of this utility model;

[0019] Figure 3 This is a cross-sectional structural diagram of the valve chamber of this utility model;

[0020] Figure 4 This is a three-dimensional structural diagram of the isolation layer of this utility model;

[0021] Figure 5 This is a three-dimensional structural diagram of the sealing layer of this utility model;

[0022] Figure 6 This is a cross-sectional structural diagram of the isolation layer of this utility model;

[0023] Figure 7 For the present utility model Figure 6 A magnified view of the structure at point A in the middle;

[0024] Figure 8 This is a schematic diagram of the left side of a pneumatic fluoropolymer-lined diaphragm valve according to the present invention.

[0025] Figure 9 This is a top view of the isolation layer of this utility model.

[0026] In the diagram: 1. Valve body; 10. Valve chamber; 11. Passageway; 100. Divider plate; 2. Diaphragm assembly; 20. Isolation layer; 21. Sealing layer; 22. Spring; 200. Flexible component; 210. Fluoroplastics; 220. Semi-circular foot; 221. Connecting foot; 3. Valve core; 30. Valve cover; 31. Mandrel; 32. Mandrel tongue; 4. Pneumatic drive device. Detailed Implementation

[0027] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0028] like Figures 1-9 As shown, a pneumatic fluoropolymer-lined diaphragm valve includes a valve body 1. The valve body 1 has a valve chamber 10 formed inside and at least two passages 11 communicating with the valve chamber 10. A diaphragm assembly 2 for closing the valve chamber 10 is installed on the valve body 1. A valve core 3 for pushing the diaphragm assembly 2 to deform is inserted inside the diaphragm assembly 2. The valve core 3 pushes the diaphragm assembly 2 to abut against the top of the valve chamber 10, thereby closing the two passages 11 communicating with the valve chamber 10.

[0029] In this embodiment, the valve body 1 is also provided with a pneumatic drive device 4 for driving the valve core 3. The diaphragm assembly 2 includes an isolation layer 20. The outer wall of the isolation layer 20 is provided with positioning plates for fixing the pneumatic drive device 4. The fixing point of the pneumatic drive device 4 is located at the isolation layer 20, thereby separating the pneumatic drive device 4 from the valve chamber 10 and the passages 11 on both sides of the valve body 1. When maintaining and repairing the valve chamber 10 and the passages 11, the pneumatic drive device 4 can be directly removed with the diaphragm assembly 2, thereby greatly improving the convenience of use and maintenance.

[0030] It should be noted that the positioning plate is also provided with through holes for mounting screws. According to the assembly requirements of the air drive device 4, a flange can be additionally installed at the through holes of the positioning plate to serve as a connection and reinforcement.

[0031] like Figures 3-5 As shown, a partition plate 100 is provided inside the valve chamber 10. A communication gap is provided between the partition plate 100 and the diaphragm assembly 2. A flexible element 200 is provided in the center of the isolation layer 20. The end face structure of the flexible element 200 is an upwardly convex curved surface structure. A sealing layer 21 is provided at the bottom of the isolation layer 20. A fluoroplastic 210 that is in contact with the flexible element 200 is provided in the center of the sealing layer 21. The isolation layer 20 and the sealing layer 21 are combined to form the diaphragm assembly 2. The valve core 3 uses the flexible element 200 to make the fluoroplastic 210 abut and seal with the top of the partition plate 100. The normal structure of the flexible element 200 is an upwardly convex curved surface structure. After being stressed at its top, it is pressed towards the valve chamber 10. At this time, the fluoroplastic 210 that is in contact with its bottom wall is simultaneously pressed down until it is completely sealed and in contact with the valve chamber 10.

[0032] In this embodiment, a double-layer diaphragm assembly 2 is adopted. The top isolation layer 20 is used to bear the pressure of the valve core 3 and generate corresponding deformation. Therefore, the flexible part 200 can be made of a material with stronger recovery ability and higher fatigue resistance. The bottom sealing layer 21 is used to bear the sealing function and resist water flow impact. Therefore, the fluoroplastic 210 can be made of a material with stronger toughness and good sealing performance. This double-layer diaphragm assembly 2 can avoid the problem that a single-layer fluoroplastic diaphragm has to bear both water flow pressure and sealing pressure at the same time, resulting in a shorter service life.

[0033] like Figures 5-7 As shown, the fluoroplastic 210 is fitted with a spring sheet 22 to keep it in contact with the flexible part 200. The spring sheet 22 is snapped between the inner walls of the sealing layer 21. The spring sheet 22 maintains the end face structure of the fluoroplastic 210 through its own elasticity. The spring sheet 22 maintains the fatigue resistance of the fluoroplastic 210. At the same time, by setting multiple spring sheets 22, the strength of the fluoroplastic 210 is further enhanced, thereby greatly improving the service life of the diaphragm assembly 2.

[0034] In this embodiment, the spring sheet 22 uses its own elasticity to keep the fluoroplastic 210 in contact with the flexible part 200, thereby avoiding the problem that the fluoroplastic 210 is easily shaken and torn after being impacted by water flow after a gap is formed between it and the flexible part 200. At the same time, the flexible part 200 provides stable support for the isolation layer 20.

[0035] The two opposite ends of the spring 22 are provided with semi-circular feet 220 to avoid squeezing the edge structure of the fluoroplastic 210. In this embodiment, the semi-circular feet 220 at both ends of the spring 22 can prevent the spring 22 from squeezing the edge of the fluoroplastic 210 when it is repeatedly deformed, thus preventing the edge of the fluoroplastic 210 from breaking.

[0036] The bottom of the spring piece 22 is provided with a connecting foot 221 for connecting the sealing layer 21 along its length. The connecting foot 221 is inserted into the fluoroplastic 210. In this embodiment, the spring piece 22 is located between the fluoroplastic 210 and the flexible part 200. The abutting and fitting fluoroplastic 210 and flexible part 200 can also play a certain role in isolating and protecting the spring piece 22, thereby avoiding the problem of corrosion and rust caused by the medium affecting the spring piece 22.

[0037] It should be noted that the spring 22 can also be installed on the side of the fluoroplastic 210 facing the valve chamber 10. Moreover, because the spring 22 restores the fluoroplastic 210 by its own elasticity, the requirement for the flexibility of the fluoroplastic 210 is reduced, so that the fluoroplastic 210 can be made of a material with strong sealing performance and good toughness.

[0038] like Figures 1-5 As shown, the valve core 3 includes a valve cover 30, which is fastened to the top of the isolation layer 20. A spindle 31 is inserted into the valve cover 30. A core tongue 32 for pushing the diaphragm assembly 2 to close the valve chamber 10 is provided at the bottom of the spindle 31. A detachable connection structure is provided between the flexible part 200 and the core tongue 32.

[0039] After the valve cover 30, the isolation layer 20 and the sealing layer 21 are stacked in sequence, they are fixed to the valve body 1 by bolts. The diaphragm assembly 2 can be removed from the valve cover 30 by bolts.

[0040] In summary, the spring 22 keeps the fluoroplastic 210 in contact with the flexible part 200 and fixes the flexible part 200 to the core tongue 32, so that it can move up and down with the core shaft 31 and deform accordingly to open or close the valve chamber 10 on the valve body 1. This avoids the problem of mechanical fatigue of the fluoroplastic 210 during long-term use. Moreover, the double-layer diaphragm assembly 2 can avoid the problem of the fluoroplastic diaphragm having a short service life due to the use of a single fluoroplastic diaphragm to bear both water flow pressure and sealing pressure in the prior art.

Claims

1. A pneumatic fluoropolymer-lined diaphragm valve, comprising a valve body (1), wherein the valve body (1) has a valve chamber (10) formed inside and at least two passages (11) communicating with the valve chamber (10), a diaphragm assembly (2) for closing the valve chamber (10) is mounted on the valve body (1), and a valve core (3) for actuating the deformation of the diaphragm assembly (2) is inserted inside the diaphragm assembly (2), characterized in that: The diaphragm assembly (2) includes an isolation layer (20), a flexible element (200) is disposed in the center of the isolation layer (20), the end face structure of the flexible element (200) is a curved structure with an upward bulge, a sealing layer (21) is disposed at the bottom of the isolation layer (20), a fluoroplastic (210) is disposed in the center of the sealing layer (21) and is in contact with the flexible element (200), and a spring piece (22) is installed on the fluoroplastic (210) to keep it in contact with the flexible element (200), the flexible element (200) and the fluoroplastic (210) deform under force to seal and close the valve chamber (10).

2. The pneumatic fluoropolymer-lined diaphragm valve according to claim 1, characterized in that: The spring piece (22) is fitted between the inner walls of the sealing layer (21), and the spring piece (22) maintains the end face structure of the fluoroplastic (210) by its own elasticity.

3. The pneumatic fluoropolymer-lined diaphragm valve according to claim 1, characterized in that: A partition plate (100) is provided inside the valve chamber (10), and a communication gap is provided between the partition plate (100) and the diaphragm assembly (2).

4. A pneumatic fluoropolymer-lined diaphragm valve according to claim 1, characterized in that: The valve core (3) includes a valve cover (30), which is fastened to the top of the isolation layer (20). A spindle (31) is inserted into the valve cover (30), and a core tongue (32) for pushing the diaphragm assembly (2) to close the valve chamber (10) is provided at the bottom of the spindle (31).

5. A pneumatic fluoropolymer-lined diaphragm valve according to claim 2, characterized in that: The two opposite ends of the spring (22) are provided with semi-circular feet (220) to avoid squeezing the edge structure of the fluoroplastic (210).

6. A pneumatic fluoropolymer-lined diaphragm valve according to claim 2, characterized in that: The bottom of the spring piece (22) is provided with a connecting foot (221) for connecting the sealing layer (21) along its length direction, and the connecting foot (221) is inserted into the fluoroplastic (210).

7. A pneumatic fluoropolymer-lined diaphragm valve according to claim 3, characterized in that: The valve core (3) is located directly above the diaphragm assembly (2), and the valve core (3) seals the fluoroplastic (210) against the top of the partition plate (100) through the flexible member (200) to close the communication gap.

8. A pneumatic fluoropolymer-lined diaphragm valve according to claim 4, characterized in that: The valve cover (30), the isolation layer (20) and the sealing layer (21) are stacked in sequence and then fixed to the valve body (1) by bolts.

9. A pneumatic fluoropolymer-lined diaphragm valve according to claim 4, characterized in that: A detachable connection structure is provided between the flexible component (200) and the core tongue (32).

10. A pneumatic fluoropolymer-lined diaphragm valve according to any one of claims 1 to 9, characterized in that: The valve body (1) is also provided with a pneumatic drive device (4) for driving the valve core (3).

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