CN217951293U - Novel membrane plug valve - Google Patents

Abstract

The utility model relates to a novel membrane plug valve. The center part and the edge part are integrally formed. The edge part is fixed relative to the lower valve body. The cylinder drives the center part to move up and down. The piston is located inside the cylinder body and divides the inside of the cylinder body into a first cavity. and the second cavity, the first cavity and the second cavity are respectively located above and below the piston, the cylinder is formed with a first vent hole, the valve stem is fixedly connected with the piston, a channel is formed inside the valve stem, and the channel of the valve stem The two ends communicate with the first air hole and the second cavity respectively. The utility model solves the problem that the membrane plug valve occupies a large space in the radial direction of the valve stem by setting the first vent hole on the top of the cylinder, using the valve stem to take in and out the air, and does not need to fix the joint on the side of the cylinder; The third sealing ring, the fourth sealing ring and the second sealing ring are sealed to limit the position of the valve stem, and the sealing retaining ring is used to position the valve stem. The combination of soft and hard points solves the high coaxiality requirements of the valve stem and the cylinder body. The problem.

Description

A new membrane plug valve

technical field

The utility model relates to the field of membrane plug valves, in particular to a novel membrane plug valve.

Background technique

The existing pneumatic membrane plug valve uses a cylinder to drive the movement of the diaphragm, thereby controlling the opening and closing of the membrane plug valve. The cylinders used in membrane plug valves are used for air intake and exhaust from the side (that is, the radial direction of the valve stem), so the joint and the side of the cylinder need to be fixed, resulting in a large space occupied by the membrane plug valve in the radial direction of the valve stem. Affects the arrangement of the membrane plug valve in use.

At the same time, the existing valve stem (ie, the piston rod) is in direct contact with the cylinder block and is slidably connected, which requires high coaxiality between the valve stem and the cylinder body.

Utility model content

The utility model aims to solve the above problems, and provides a new type of membrane plug valve, which solves the problem that the membrane plug valve occupies a large space in the radial direction of the valve stem, and solves the problem of high coaxiality between the valve stem and the cylinder body. The problem.

A new membrane plug valve, comprising: a lower valve body, a diaphragm and a cylinder, the diaphragm includes a central part and an edge part, the central part and the edge part are integrally formed, the edge part is fixed relative to the lower valve body, the The cylinder drives the central part to move up and down. The cylinder includes a cylinder, a valve rod or a piston. The piston is located inside the cylinder and divides the interior of the cylinder into a first cavity and a second cavity. The first cavity and the second cavity are respectively located above and below the piston, the cylinder body is formed with a first vent hole, the valve stem is fixedly connected with the piston, a passage is formed inside the valve stem, and the two ends of the passage of the valve stem communicate with the first air hole and the second cavity respectively.

On the basis of the above technical solution, it also includes a spring and a fourth sealing ring. The cylinder body of the cylinder includes a lower end cover, a cylinder body and an upper end cover, and the two ends of the cylinder body are respectively fixedly connected with the lower end cover and the upper end cover. The spring is located in the first cavity, the two ends of the spring are in contact with the upper end cover and the piston respectively, the fourth sealing ring is sleeved on the outside of the piston, and the fourth sealing ring is slidably connected with the inner wall of the cylinder.

On the basis of the above technical solution, it also includes a third sealing ring, the upper end cover is formed with a communication hole, the first air hole is formed in the upper end cover, the communication hole communicates with the first air hole, and the third The sealing ring is fixed in the communication hole, and the inner and outer sides of the third sealing ring are attached to the valve stem and the inner wall of the communication hole respectively, and the communication hole communicates with the channel of the valve stem.

On the basis of the above technical solution, the channel of the valve stem includes an axial blind hole and a radial through hole, the axial blind hole communicates with the communication hole, and the two ends of the radial through hole respectively connect with the axial blind hole. It communicates with the second cavity; the upper end cover is formed with a second air hole.

On the basis of the above technical solution, it also includes a seal retaining ring and a second seal ring. The ring is fixed to the lower end cover, the valve stem is slidably connected to the seal retaining ring, the inner and outer sides of the second sealing ring are respectively attached to the valve stem and the lower end cover, and the second sealing ring is fixed to the lower end cover;

The sealing and retaining ring is made of polytetrafluoroethylene.

On the basis of the above technical solution, a screw is also included, the enlarged part of the screw is inserted into the central part and fixedly connected with the central part, the screw is threadedly connected with the valve stem; the upper end of the central part is attached to the lower end of the valve stem;

The lower end cover is fixedly connected with the lower valve body, and the lower end cover and the lower valve body clamp and fix the edge.

On the basis of the above technical solution, a third cavity is formed between the diaphragm and the lower end cover, the lower end cover is formed with a third air hole, and the third cavity communicates with the third air hole.

On the basis of the above technical solution, the lower valve body is formed with an inlet, an outlet and a valve seat, the inlet and the outlet are connected through the valve seat, the valve seat is formed with a first sealing tapered surface, and the central part is formed with a The second sealing cone adapted to the first sealing cone; the diaphragm and the valve seat are both rotary bodies, and the diaphragm is made of elastic material.

On the basis of the above technical solution, the diaphragm is made of polytetrafluoroethylene.

The utility model has the following advantages: by setting the first vent hole on the top of the cylinder, the valve rod is used for air intake and outlet, and there is no need to fix the joint on the side of the cylinder, which solves the problem that the membrane plug valve occupies a large space in the radial direction of the valve rod The valve stem is limited by the sealing of the third sealing ring, the fourth sealing ring and the second sealing ring, the valve stem is positioned by the sealing retaining ring, and the combination of soft and hard points solves the problem that the valve stem and the cylinder are coaxial more demanding questions.

Description of drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Apparently, the accompanying drawings in the following description are only one embodiment of the utility model, and those of ordinary skill in the art can obtain other implementations according to the provided drawings without creative work. Attached picture.

Fig. 1: the schematic diagram of the cross-sectional structure of the utility model when it is closed;

Fig. 2: Schematic diagram of the cross-sectional structure of the utility model when it is opened.

Detailed ways

Below in conjunction with accompanying drawing and example the utility model is described further:

Embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the drawings, wherein the same or similar reference numerals represent the same or similar elements or elements with the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present utility model, but should not be construed as limiting the present utility model.

In the description of the present utility model, it should be noted that, unless otherwise clearly stipulated and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a flexible connection. Disassembled connection, or integral connection; it can be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present utility model in specific situations.

In describing the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top" , "bottom", "inner", "outer" and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, rather than indicating or implying Any device or element must have a specific orientation, be constructed and operate in a specific orientation, and thus should not be construed as limiting the invention.

Embodiment one:

As shown in Figures 1 and 2, this embodiment provides a new membrane plug valve, including: a lower valve body 1, a diaphragm 3 and a cylinder, the diaphragm 3 includes a central portion 31 and an edge portion 32, the The central portion 31 and the edge portion 32 are integrally formed, the edge portion 32 is fixed relative to the lower valve body 1, and the cylinder drives the central portion 31 to move up and down. The cylinder includes a cylinder body, a valve stem 6 or a piston 7, and the piston 7 Located inside the cylinder and dividing the inside of the cylinder into a first cavity and a second cavity, the first cavity and the second cavity are respectively located above and below the piston 7, and the cylinder is formed with a first passage Air hole 51 , the valve stem 6 is fixedly connected with the piston 7 , a passage is formed inside the valve stem 6 , and both ends of the passage of the valve stem 6 communicate with the first vent hole 51 and the second cavity respectively.

On the basis of the above-mentioned technical solution, it also includes a spring 71 and a fourth sealing ring 72. The cylinder body of the cylinder includes a lower end cover 2, a cylinder body 4 and an upper end cover 5, and the two ends of the cylinder body 4 are connected with the lower end cover 2 and the upper end cover 5 respectively. The upper end cover 5 is fixedly connected, the spring 71 is located in the first cavity, the two ends of the spring 71 are in contact with the upper end cover 5 and the piston 7 respectively, the fourth sealing ring 72 is sleeved on the outside of the piston 7, and the fourth The sealing ring 72 is slidingly connected with the inner wall of the barrel 4 .

On the basis of the above technical solution, it also includes a third sealing ring 54, the upper end cover 5 is formed with a communication hole 53, the first air hole 51 is formed in the upper end cover 5, the communication hole 53 and the first air hole 51 The third seal ring 54 is fixed in the communication hole 53, the inner and outer sides of the third seal ring 54 are respectively attached to the valve stem 6 and the inner wall of the communication hole 53, and the communication hole 53 is connected to the inner wall of the valve stem 6. The channels are connected.

On the basis of the above technical solution, the channel of the valve stem 6 includes an axial blind hole 61 and a radial through hole 62, the axial blind hole 61 communicates with the communication hole 53, and the two ends of the radial through hole 62 communicate with the axial blind hole 61 and the second cavity respectively; the upper end cover 5 is formed with a second air hole 52 .

On the basis of the above technical solution, it also includes a seal retaining ring 21 and a second seal ring 22, the cross section of the seal retaining ring 21 is rectangular, and the inner and outer sides of the seal retaining ring 21 are attached to the valve stem 6 and the lower end cover 2 respectively. The seal retaining ring 21 is fixed to the lower end cover 2, the valve stem 6 is slidably connected to the seal retaining ring 21, and the inner and outer sides of the second seal ring 22 are attached to the valve stem 6 and the lower end cover 2 respectively. The second sealing ring 22 is fixed with the lower end cover 2;

The sealing and retaining ring 21 is made of polytetrafluoroethylene.

On the basis of the above-mentioned technical solution, a screw 63 is also included, the enlarged part of the screw 63 is inserted into the central part 31 and fixedly connected with the central part 31, and the screw 63 is threaded with the valve stem 6; the upper end of the central part 31 is connected to the The lower end of the valve stem 6 is bonded;

The lower end cover 2 is fixedly connected with the lower valve body 1 , and the lower end cover 2 and the lower valve body 1 clamp and fix the edge portion 32 .

On the basis of the above technical solution, a third cavity 30 is formed between the diaphragm 3 and the lower end cover 2, the lower end cover 2 is formed with a third vent hole 23, and the third cavity 30 is connected to the third vent hole. The air holes 23 communicate with each other.

On the basis of the above technical solution, the lower valve body 1 is formed with an inlet 11, an outlet 12 and a valve seat 13, the inlet 11 and the outlet 12 are connected through the valve seat 13, and the valve seat 13 is formed with a first sealing cone surface 14, the central part 31 is formed with a second sealing cone surface 33 compatible with the first sealing cone surface 14; the diaphragm 3 and the valve seat 13 are both rotary bodies, and the diaphragm 3 is made of elastic material production.

On the basis of the above technical solution, the diaphragm 3 is made of polytetrafluoroethylene.

working principle:

When the valve is opened, the high-pressure gas enters the communication hole 53 from the first vent hole 51 , and the high-pressure gas enters the second cavity through the axial blind hole 61 and the radial through hole 62 in sequence. The high-pressure gas pushes the piston 7 to move upward, and then drives the valve stem 6 and the central part 31 to move upward. The second sealing cone surface 33 is out of contact with the first sealing cone surface 14 , the liquid enters through the valve seat 13 from the inlet 11 and flows out from the outlet 12 , and the liquid flow direction is shown by the arrow in FIG. 2 .

When the valve is closed, the gas source is disconnected from the first vent hole 51, and the first vent hole 51 is connected to the outside atmosphere. The spring 71 rebounds to push the piston 7 to move downward, and the gas in the second cavity is discharged from the first vent hole 51 along the channel. The second tapered sealing surface 33 is in contact with the first tapered sealing surface 14 to disconnect the inlet 11 from the outlet 12 .

Wherein, the volume of the third chamber 30 will change during the movement of the diaphragm 3 , and the third vent hole 23 can play the role of air intake and exhaust. At the same time, the first through hole 22 can also discharge the liquid under the membrane 3 after the membrane 3 is broken. The liquid flows out from the first through hole 22 , which can remind the user to replace the diaphragm 3 .

Wherein, the hard valve seat 13 is in contact with the diaphragm 3 made of elastic material, and the sealing point is combined with soft and hard, and the sealing performance is better. Both the second sealing tapered surface 33 and the first sealing tapered surface 14 are tapered surfaces, which are inclined to seal, have guiding properties, and have better sealing performance. The second sealing cone surface 33 and the first sealing cone surface 14 have a small sealing surface and a small contact surface, which reduces the residual liquid on the sealing surface when closing, reduces the amount of crystallization of the residual liquid on the sealing surface, and improves the valve seat 13. And the life of diaphragm 3.

Wherein, the upper end of the central part 31 is attached to the lower end of the valve stem 6, and the two are in hard contact to ensure the verticality of the central part 31, which is conducive to sealing.

The valve stem 6 and the piston 7 are fixedly connected and move synchronously, and are softly positioned by the third sealing ring 54, the fourth sealing ring 72 and the second sealing ring 22 (made of rubber or silica gel). The ring has a larger amount of compression locally to adapt to the coaxiality error between the piston 7 and the barrel 4, and to adapt to the coaxiality error between the valve stem 6 and the lower end cover 2 and upper end cover 5. The outer surface of the valve stem 6 and the inner surface of the sealing and retaining ring 21 are both cylindrical and fit together, and the sealing and retaining ring 21, which is harder than the sealing ring, positions the valve stem 6, thereby realizing multi-point positioning and combination of soft and hard points , better coaxiality, better sealing and longer life.

The utility model has been described above with examples, but the utility model is not limited to the above-mentioned specific embodiments, and any changes or modifications made based on the utility model all belong to the protection scope of the utility model.

Claims (9)

1. A novel membrane plug valve is characterized in that it comprises: a lower valve body (1), a diaphragm (3) and a cylinder, and the diaphragm (3) comprises a central portion (31) and an edge portion (32), The central part (31) and the edge part (32) are integrally formed, the edge part (32) is fixed relative to the lower valve body (1), the cylinder drives the center part (31) to move up and down, and the cylinder includes a cylinder body , a valve stem (6) or a piston (7), the piston (7) is located inside the cylinder and divides the inside of the cylinder into a first cavity and a second cavity, the first cavity and the second cavity Located above and below the piston (7), the cylinder body is formed with a first vent hole (51), the valve stem (6) is fixedly connected with the piston (7), and the valve stem (6) is internally formed with channel, the two ends of the channel of the valve stem (6) communicate with the first vent hole (51) and the second cavity respectively. 2. A new membrane plug valve according to claim 1, characterized in that: it also includes a spring (71) and a fourth sealing ring (72), and the cylinder body of the cylinder includes a lower end cover (2), a cylindrical body (4) and the upper end cap (5), the two ends of the cylinder (4) are fixedly connected with the lower end cap (2) and the upper end cap (5) respectively, the spring (71) is located in the first cavity, and the Both ends of the spring (71) are respectively in contact with the upper end cover (5) and the piston (7), the fourth sealing ring (72) is set on the outside of the piston (7), and the fourth sealing ring (72) is in contact with the cylinder ( 4) Sliding connection on the inner wall. 3. A new membrane plug valve according to claim 2, characterized in that: it also includes a third sealing ring (54), the upper end cover (5) is formed with a communication hole (53), the first through The air hole (51) is formed in the upper end cover (5), the communication hole (53) communicates with the first ventilation hole (51), the third sealing ring (54) is fixed in the communication hole (53), the The inner and outer sides of the third sealing ring (54) are respectively attached to the valve stem (6) and the inner wall of the communication hole (53), and the communication hole (53) communicates with the channel of the valve stem (6). 4. A new membrane plug valve according to claim 3, characterized in that: the passage of the valve stem (6) includes an axial blind hole (61) and a radial through hole (62), and the axial The blind hole (61) communicates with the communication hole (53), and the two ends of the radial through hole (62) respectively communicate with the axial blind hole (61) and the second cavity; the upper end cover (5) forms There is a second vent hole (52). 5. A kind of novel membrane plug valve according to claim 2, is characterized in that: also comprise seal retaining ring (21) and second seal ring (22), the section of described seal retaining ring (21) is rectangular, The inner and outer sides of the seal retaining ring (21) are respectively attached to the valve stem (6) and the lower end cover (2), the seal retainer ring (21) is fixed to the lower end cover (2), and the valve stem (6) Slidingly connected with the sealing retaining ring (21), the inner and outer sides of the second sealing ring (22) are respectively attached to the valve stem (6) and the lower end cover (2), and the second sealing ring (22) is connected to the lower end cover (2) Fixed; The sealing and retaining ring (21) is made of polytetrafluoroethylene. 6. A new membrane plug valve according to claim 2, characterized in that: it also includes a screw (63), the enlarged part of the screw (63) is inserted into the central part (31) and connected with the central part (31) Fixedly connected, the screw (63) is threadedly connected with the valve stem (6); the upper end of the central part (31) is attached to the lower end of the valve stem (6); The lower end cover (2) is fixedly connected with the lower valve body (1), and the lower end cover (2) and the lower valve body (1) clamp and fix the edge portion (32). 7. A new membrane plug valve according to claim 1, characterized in that: a third cavity (30) is formed between the diaphragm (3) and the lower end cover (2), and the lower end cover ( 2) A third air hole (23) is formed, and the third cavity (30) communicates with the third air hole (23). 8. A new membrane plug valve according to claim 1, characterized in that: the lower valve body (1) is formed with an inlet (11), an outlet (12) and a valve seat (13), and the inlet ( 11) communicates with the outlet (12) through the valve seat (13), the valve seat (13) is formed with a first sealing cone (14), and the central part (31) is formed with the first sealing cone ( 14) A second matching sealing tapered surface (33); the diaphragm (3) and the valve seat (13) are both rotary bodies, and the diaphragm (3) is made of elastic material. 9. A new membrane plug valve according to claim 1, characterized in that: said membrane (3) is made of polytetrafluoroethylene.

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