Butterfly valve with double sealing structure

Abstract

The utility model discloses a butterfly valve with double -layer sealing structure, include: valve body and butterfly plate, butterfly plate installs inside the valve body, the inside of butterfly plate is provided with chamber, the top of valve body is installed with valve stem, and valve stem lower extreme extends to the inside of chamber, both sides of butterfly plate all are fixedly connected with elastic diaphragm, the lateral wall of butterfly plate is opened with recess groove symmetry, and the inside of recess groove is installed with first sealing washer, the inside of butterfly plate is provided with the expansion mechanism for to first sealing washer expands, the utility model discloses the setting of butterfly plate, first sealing washer and expansion mechanism etc. part, on one hand can realize the double -layer sealing effect of pipeline both sides, on the other hand through the expansion and contraction of first sealing washer, in the frequent opening and closing of butterfly plate, can reduce the first sealing washer and the valve body inner wall sustained rubbing in the rotation process of butterfly plate, lead to the problem of first sealing washer service life shortening, reduce maintenance cost.

Description

Technical Field

[0001] This utility model relates to the field of butterfly valve technology, specifically a butterfly valve with a double-layer sealing structure. Background Technology

[0002] A butterfly valve, also known as a flap valve, is a simple regulating valve that can be used for on / off control of low-pressure pipeline media. A butterfly valve is a valve in which the closing element (valve disc or butterfly plate) is a disc that rotates around the valve shaft to achieve opening and closing. It is widely used in water treatment, energy transmission and chemical industries. Traditional butterfly valves rely on a single-layer sealing structure (such as rubber sealing rings or metal hard seals), but existing butterfly valves still have certain shortcomings in actual use.

[0003] In butterfly valves operating under frequent opening and closing conditions (such as in chemical process control), the rubber sealing ring experiences full-circumferential friction with the valve body wall with each rotation of the butterfly plate. Prolonged and frequent opening and closing reduces the lifespan and reliability of the rubber sealing ring, leading to continuous leakage and a surge in maintenance costs. Therefore, this invention designs a butterfly valve with a double-layer sealing structure to address the problems existing in the prior art. Utility Model Content

[0004] The purpose of this invention is to provide a butterfly valve with a double-layer sealing structure to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: a butterfly valve with a double-layer sealing structure, comprising: a valve body and a butterfly plate, the butterfly plate being installed inside the valve body, the butterfly plate having a chamber inside, a valve stem being installed on the top of the valve body, and the lower end of the valve stem extending into the chamber, elastic diaphragms being fixedly connected to both sides of the butterfly plate, grooves being symmetrically formed on the sidewalls of the butterfly plate, and a first sealing ring being installed inside the grooves, and an expansion mechanism for expanding the first sealing ring being provided inside the butterfly plate.

[0006] Preferably, the elastic diaphragm has an arc-shaped structure and is made of rubber.

[0007] Preferably, the width of the groove matches the thickness of the first sealing ring.

[0008] Preferably, a second sealing ring is fixedly installed on both sides of the butterfly plate, and the second sealing ring is made of stainless steel.

[0009] Preferably, the expansion mechanism includes: three first extrusion members, which are equidistantly arranged around the circumference inside the groove, with one side of each first extrusion member fitting against the inner wall of the first sealing ring; a second extrusion member is provided between two adjacent first extrusion members, with one side of the second extrusion member resting against the inner wall of the groove; an extrusion rod is fixedly connected to the inner walls of both the first and second extrusion members, with one end of the extrusion rod extending into the cavity; a spring is fitted onto the surface of the extrusion rod, with both ends of the spring fixedly installed on one end of the extrusion rod and the inner wall of the disc plate; and an extrusion assembly is provided between the first and second extrusion members on the same side.

[0010] Preferably, the extrusion assembly includes: a movable rod, which is horizontally fixedly installed at the lower end of the valve rod, and both ends of the movable rod are respectively fixedly installed on the inner walls of adjacent elastic diaphragms. Conical plates are fixedly installed on the surfaces of both ends of the movable rod, and the surfaces of the conical plates overlap the surfaces of one end of the adjacent extrusion rod.

[0011] Preferably, one end of the extrusion rod is fixedly connected to an extrusion ball, and the surface of the extrusion ball rests on the inclined surface of the conical plate.

[0012] Preferably, both the first extruder and the second extruder are trapezoidal, and the inclined surface on one side of the first extruder is in contact with the inclined surface on one side of the adjacent second extruder.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] 1. This utility model, through the setting of components such as butterfly plate, first sealing ring and expansion mechanism, can achieve a double-layer sealing effect on both sides of the pipeline. On the other hand, through the expansion and contraction of the first sealing ring, it can reduce the problem of continuous friction between the first sealing ring and the inner wall of the valve body during the frequent opening and closing of the butterfly plate, which leads to a shortened life of the first sealing ring and reduces maintenance costs.

[0015] 2. By setting up components such as the expansion mechanism and the extrusion assembly, the extrusion rod pushes the first extrusion piece and the second extrusion piece to come into contact with the inner wall of the first sealing ring. The greater the pressure, the greater the expansion of the first sealing ring, so that it can fit more tightly with the inner wall of the pipe, thereby achieving a better sealing effect. Attached Figure Description

[0016] Figure 1 This is a three-dimensional schematic diagram of the present invention;

[0017] Figure 2 This is a left-side view of the present invention;

[0018] Figure 3This is a cross-sectional schematic diagram of the butterfly plate and expansion mechanism of this utility model;

[0019] Figure 4 This is a partial structural diagram of the first extrusion component and the second extrusion component of this utility model;

[0020] Figure 5 For the present utility model Figure 4 Enlarged schematic diagram of the structure at point A in the middle.

[0021] In the diagram: 1. Valve body; 101. Valve stem; 2. Butterfly plate; 201. Elastic diaphragm; 202. Groove; 203. Chamber; 204. Second sealing ring; 3. First sealing ring; 4. Expansion mechanism; 401. First extrusion component; 402. Second extrusion component; 403. Extrusion rod; 4031. Spring; 404. Extrusion assembly; 4041. Movable rod; 4042. Conical plate. Detailed Implementation

[0022] 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.

[0023] Please see Figure 1-5 An embodiment of this utility model provides a butterfly valve with a double-layer sealing structure, comprising: a valve body 1 and a butterfly plate 2. The butterfly plate 2 is installed inside the valve body 1, and a chamber 203 is formed inside the butterfly plate 2. A valve stem 101 is installed on the top of the valve body 1, and the lower end of the valve stem 101 extends into the chamber 203. Elastic diaphragms 201 are fixedly connected to both sides of the butterfly plate 2. Grooves 202 are symmetrically formed on the side wall of the butterfly plate 2, and a first sealing ring 3 is installed inside the groove 202. An expansion mechanism 4 for expanding the first sealing ring 3 is provided inside the butterfly plate 2.

[0024] It should be added that the outer rings on both sides of the butterfly plate 2 are rigid seals. When the butterfly plate 2 seals the pipeline, the outer walls on both sides of the butterfly plate 2 first fit against the inner wall of the valve body 1 to achieve a primary seal.

[0025] Please see Figure 1-5 In the embodiments of this utility model: the elastic diaphragm 201 has an arc-shaped structure and is made of rubber.

[0026] It should be noted that, under the action of positive and negative pressure, the elastic diaphragms 201 on both sides of the butterfly plate 2 can deform and shift towards the low-pressure side through the elastic diaphragms 201 made of rubber, thereby pushing the movable rod 4041 connected to it to move.

[0027] Please see Figure 1-5 In an embodiment of this utility model, the width of the groove 202 matches the thickness of the first sealing ring 3.

[0028] It should be noted that the first sealing ring 3 is made of rubber and has a certain amount of expansion and contraction. When the inner side of the first sealing ring 3 is not compressed, the first sealing ring 3 is contracted inside the groove 202. When the expansion mechanism 4 expands the inner wall of the first sealing ring 3 radially, the inner side of the first sealing ring 3 is compressed and expands outward to perform secondary sealing.

[0029] Please see Figure 1-5 In the embodiment of this utility model: a second sealing ring 204 is fixedly installed on both sides of the butterfly plate 2, and the second sealing ring 204 is made of stainless steel.

[0030] It should be added that the outer rings on both sides of the butterfly plate 2 are rigid seals. When the butterfly plate 2 seals the pipeline, the second sealing ring 204 on the outer wall of both sides of the butterfly plate 2 first fits against the inner wall of the valve body 1 to achieve a primary seal.

[0031] Please see Figure 1-5 In this embodiment of the present invention: the expansion mechanism 4 includes: a first extrusion member 401, three first extrusion members 401 are provided, the three first extrusion members 401 are equidistantly arranged in the groove 202 along the circumference, and one side of the first extrusion member 401 is in contact with the inner wall of the first sealing ring 3. A second extrusion member 402 is provided between two adjacent first extrusion members 401, and one side of the second extrusion member 402 is attached to the inner wall of the groove 202. An extrusion rod 403 is fixedly connected to the inner wall of both the first extrusion member 401 and the second extrusion member 402, and one end of the extrusion rod 403 extends into the cavity 203. A spring 4031 is fitted on the surface of the extrusion rod 403, and the two ends of the spring 4031 are respectively fixedly installed on one end of the extrusion rod 403 and the inner wall of the butterfly plate 2. An extrusion assembly 404 is provided between the first extrusion member 401 and the second extrusion member 402 on the same side.

[0032] Two first sealing rings 3 symmetrically arranged on the butterfly plate 2 are configured such that, when subjected to positive pressure, the elastic diaphragm 201 on the positive pressure side deforms and displaces, thereby pushing the connected movable rod 4041 to move. This causes the conical plate 4042 fixed on the movable rod 4041 to push the extrusion rod 403 on the same side to move. Consequently, the extrusion rod 403 drives the first extrusion member 401 and the second extrusion member 402 to expand the first sealing ring 3 on the positive pressure side, achieving secondary sealing on the positive pressure side. Conversely, when subjected to reverse pressure, the elastic diaphragm 201 on the reverse pressure side deforms and displaces, thereby pushing the connected movable rod 4041 to move. This causes the conical plate 4042 fixed on the movable rod 4041 to expand the first sealing ring 3 on the positive pressure side, achieving secondary sealing on the positive pressure side. Plate 4042 pushes the extrusion rod 403 on the same side to move, causing the extrusion rod 403 to drive the first extrusion member 401 and the second extrusion member 402 to expand the first sealing ring 3 located on the reverse pressure side, realizing a secondary seal on the reverse pressure side. When there is no medium pressure, the spring 4031 elastically resets, causing the extrusion rod 403 to press and push the inclined surface of the conical plate 4042, causing the conical plate 4042 to move and reset. On the one hand, it achieves a double-layer sealing effect on both sides of the pipeline. On the other hand, through the expansion and contraction of the first sealing ring 3, during the frequent opening and closing of the butterfly plate 2, it can reduce the problem of continuous friction between the first sealing ring 3 and the inner wall of the valve body during the rotation of the butterfly plate 2, which leads to a shortened life of the first sealing ring 3, thus reducing maintenance costs.

[0033] Please see Figure 1-5 In an embodiment of this utility model: the extrusion assembly 404 includes: a movable rod 4041, which is fixedly installed horizontally at the lower end of the valve rod 101. The two ends of the movable rod 4041 are respectively fixedly installed on the inner wall of the adjacent elastic diaphragm 201. A tapered plate 4042 is fixedly installed on the surface of both ends of the movable rod 4041, and the surface of the tapered plate 4042 overlaps the surface of one end of the adjacent extrusion rod 403.

[0034] In the use of the butterfly valve, when the medium enters, under positive pressure, the pressure pushes the elastic diaphragm 201 on one side of the butterfly plate 2 to deform and displace, thereby pushing the movable rod 4041 connected to it to move. The movable rod 4041 drives the tapered plate 4042 fixed on the surface to move. At this time, the tapered plate 4042 squeezes one end of multiple extrusion rods 403 on the same side, so that the extrusion rods 403 push the corresponding first extrusion member 401 and second extrusion member 402 to come into contact with the inner wall of the first sealing ring 3, expanding the first sealing ring 3. The greater the pressure, the greater the expansion of the first sealing ring 3, and the tighter it can fit with the inner wall of the pipeline, resulting in a better sealing effect.

[0035] Please see Figure 1-5 In an embodiment of this utility model: one end of the extrusion rod 403 is fixedly connected to an extrusion ball, and the surface of the extrusion ball rests on the inclined surface of the conical plate 4042.

[0036] It should be noted that by setting the extrusion ball, the contact area between one end of the extrusion rod 403 and the inclined surface of the conical plate 4042 can be reduced, thereby reducing the friction between the two and making it easier for the conical plate 4042 to push the first extrusion member 401 and the second extrusion member 402 closer to the inner wall of the first sealing ring 3, thus expanding the first sealing ring 3.

[0037] Please see Figure 1-5 In this embodiment of the present invention: both the first extruder 401 and the second extruder 402 are trapezoidal, and the inclined surface on one side of the first extruder 401 fits into the inclined surface on one side of the adjacent second extruder 402. Both the first extruder 401 and the second extruder 402 have an arc-shaped trapezoidal structure, which matches the inner wall of the first sealing ring 3.

[0038] Since the inclined surface of the second extruder 402 matches the inclined surface of the adjacent first extruder 401, when the extrusion rod 403 on the second extruder 402 is compressed and pushes the second extruder 402 to move, the second extruder 402 can simultaneously push the first extruder 401 to move synchronously through the inclined surface, thereby improving the stability of the movement of the first extruder 401. At the same time, after the first extruder 401 and the second extruder 402 move into place, the first extruder 401 and the second extruder 402 on the adjacent side are set with inclined surfaces, which can increase the contact area and further improve the sealing performance. After the first extruder 401 and the second extruder 402 move into place, the three first extruders 401 and the three second extruders 402 form a ring, so that the inner wall of the first sealing ring 3 can be evenly stressed.

[0039] Working Principle: In the use of the butterfly valve, when the medium enters and is subjected to positive pressure, the elastic diaphragm 201 on the positive pressure side deforms and displaces, thereby pushing the connected movable rod 4041 to move. This causes the conical plate 4042 fixed on the movable rod 4041 to push the pressing rod 403 on the same side to move. The pressing rod 403 then drives the first pressing element 401 and the second pressing element 402 to expand the first sealing ring 3 on the positive pressure side, achieving a secondary seal on the positive pressure side. Conversely, when subjected to reverse pressure, the elastic diaphragm 201 on the reverse pressure side deforms and displaces, thereby pushing the connected movable rod 4041 to move. This causes the conical plate 4042 fixed on the movable rod 4041 to push the pressing rod 403 on the same side, causing the pressing rod 403 to drive the first pressing element 401 and the second pressing element 402 to expand the first sealing ring 3 on the reverse pressure side, achieving a secondary seal on the reverse pressure side. Content not described in detail in this specification is prior art known to those skilled in the art.

[0040] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A butterfly valve with a double-layer sealing structure, comprising: The valve body (1) and the butterfly plate (2) are characterized in that: the butterfly plate (2) is installed inside the valve body (1), the butterfly plate (2) has a chamber (203) inside, the valve body (1) has a valve stem (101) installed on the top, and the lower end of the valve stem (101) extends into the chamber (203), the two sides of the butterfly plate (2) are fixedly connected with elastic diaphragms (201), the sidewalls of the butterfly plate (2) are symmetrically provided with grooves (202), and a first sealing ring (3) is installed inside the grooves (202), and the butterfly plate (2) is provided with an expansion mechanism (4) for expanding the first sealing ring (3).

2. A butterfly valve with a double-layer sealing structure according to claim 1, characterized in that: The elastic diaphragm (201) has an arc-shaped structure and is made of rubber.

3. A butterfly valve with a double-layer sealing structure according to claim 1, characterized in that: The width of the groove (202) matches the thickness of the first sealing ring (3).

4. A butterfly valve with a double-layer sealing structure according to claim 1, characterized in that: The butterfly plate (2) is fixedly installed with a second sealing ring (204) on both sides, and the second sealing ring (204) is made of stainless steel.

5. A butterfly valve with a double-layer sealing structure according to claim 1, characterized in that: The expansion mechanism (4) includes: three first extrusion members (401), which are equidistantly arranged in the groove (202) along the circumference, with one side of each first extrusion member (401) fitting against the inner wall of the first sealing ring (3). A second extrusion member (402) is provided between two adjacent first extrusion members (401), with one side of each second extrusion member (402) resting against the inner wall of the groove (202). An extrusion rod (403) is fixedly connected to the inner wall of both the first extrusion member (401) and the second extrusion member (402), and one end of the extrusion rod (403) extends into the cavity (203). A spring (4031) is fitted on the surface of the extrusion rod (403), and the two ends of the spring (4031) are respectively fixedly installed on one end of the extrusion rod (403) and the inner wall of the butterfly plate (2). An extrusion assembly (404) is provided between the first extrusion member (401) on the same side and the second extrusion member (402) on the same side.

6. A butterfly valve with a double-layer sealing structure according to claim 5, characterized in that: The extrusion assembly (404) includes: a movable rod (4041), which is fixedly installed horizontally at the lower end of the valve stem (101). Both ends of the movable rod (4041) are respectively fixedly installed on the inner wall of the adjacent elastic diaphragm (201). A conical plate (4042) is fixedly installed on the surface of both ends of the movable rod (4041), and the surface of the conical plate (4042) overlaps the surface of one end of the adjacent extrusion rod (403).

7. A butterfly valve with a double-layer sealing structure according to claim 6, characterized in that: One end of the extrusion rod (403) is fixedly connected to an extrusion ball, and the surface of the extrusion ball rests on the inclined surface of the conical plate (4042).

8. A butterfly valve with a double-layer sealing structure according to claim 5, characterized in that: Both the first extruder (401) and the second extruder (402) are trapezoidal, and the inclined surface on one side of the first extruder (401) is in contact with the inclined surface on one side of the adjacent second extruder (402).

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