Stainless steel clamp butterfly valve convenient to maintain and maintenance method thereof

Abstract

The stainless steel clamp butterfly valve convenient to maintain comprises a valve body, an upper valve shaft, a valve plate and a lower valve shaft, the upper valve shaft is a flat shaft and penetrates through the center of the valve plate from top to bottom, a flat hole is formed in the lower end face of the upper valve shaft, the flat hole is formed along the axis of the upper valve shaft, and the flat hole extends to the corresponding position of the upper end of the valve plate from bottom to top; the lower valve shaft is a flat shaft and penetrates through the valve plate from bottom to top. According to the stainless steel clamp butterfly valve, the flat hole is matched with the flat shaft, automatic centering of the valve plate is facilitated, and therefore the problem that the torque is large due to the fact that the symmetry error of the valve plate is large is solved; the clamp connector is detachably connected with a clamp, is suitable for the position where the flange cannot be mounted due to limitation, and is quick and trouble-saving to dismount; the valve plate and the valve seat can be replaced, an original disposable fire-fighting clamp butterfly valve is replaced, and the whole machine is scrapped when one part is damaged.

Description

Technical Field

[0001] The invention belongs to the field of clamp butterfly valves, and in particular relates to a stainless steel clamp butterfly valve which is easy to maintain and a maintenance method thereof. Background Art

[0002] The clamp butterfly valve is an industrial product suitable for use in pipelines that transport various corrosive and non-corrosive fluid media in engineering systems to regulate and cut off the flow of media. Among them, the electrically controlled clamp butterfly valve requires a reducer to be installed on the valve stem to stop the butterfly plate at any position. The valve plate of the existing fire-fighting clamp butterfly valve is a ductile iron rubber-wrapped structure. The valve plate can only be configured in this way, which is relatively simple and is not suitable for assembly with flat-structured electroplated plates or stainless steel plates. In addition, the existing fire-fighting clamp butterfly valves are usually disposable products, which are not easy to repair. When one part is damaged, the entire butterfly valve will be scrapped. Summary of the invention

[0003] In view of this, the present invention aims to provide a stainless steel clamp butterfly valve that is easy to maintain and a maintenance method thereof, wherein the upper valve shaft, valve plate and lower valve shaft can be made of stainless steel material, and the valve plate and valve seat can be replaced during maintenance.

[0004] To achieve the above object, the technical solution of the present invention is achieved as follows: A stainless steel clamp butterfly valve that is easy to maintain, comprising a valve body, an upper valve shaft, a valve plate and a lower valve shaft, wherein the upper valve shaft comprises an upper valve body connecting section and a first valve plate connecting section connected in sequence from top to bottom; the upper valve body connecting section connects the upper part of the valve body, and its cross section is circular, the first valve plate connecting section is a flat shaft, and the first valve plate connecting section of the upper valve shaft passes through the center of the valve plate; a flat hole is provided on the lower end surface of the upper valve shaft, the flat hole is arranged along the axis of the upper valve shaft, and the flat hole extends from bottom to top to the corresponding position of the upper end of the valve plate; the lower valve shaft is a flat shaft, comprising a lower valve body connecting section and a second valve plate connecting section connected in sequence from bottom to top; the lower valve body connecting section connects the bottom of the valve body, the second valve plate connecting section is inserted into the flat hole, and the second valve plate connecting section passes through the valve plate from bottom to top; the outer diameter of the lower valve body connecting section is smaller than the outer diameter of the first valve plate connecting section. Clamp interfaces are respectively provided on both sides of the valve body, the clamp interfaces can be detachably connected to the clamp, and a clamp groove for connecting with a pipeline is provided on the clamp.

[0005] Furthermore, an internal thread is provided in the clamp interface, and an external thread is provided on the clamp; the clamp interface and the clamp are detachably connected through the cooperation of the internal thread and the external thread.

[0006] Furthermore, the upper valve shaft is fitted with a first backrest valve seat and a second backrest valve seat, the first backrest valve seat and the second backrest valve seat are installed in the valve body and are respectively located at the upper and lower ends of the valve plate, and the side end surfaces of the first backrest valve seat and the second backrest valve seat are abutted against the clamp end surface.

[0007] Furthermore, the first backrest valve seat and the second backrest valve seat are provided with mounting through holes, and the upper valve shaft is inserted into the mounting through holes to form a detachable connection.

[0008] Furthermore, a connecting belt is provided between the first backrest valve seat and the second backrest valve seat, and the connecting belt connects the first backrest valve seat and the second backrest valve seat into an integral component.

[0009] Furthermore, the upper portion of the upper valve body connecting section is assembled in the valve body via a shaft sleeve and a retaining spring.

[0010] Furthermore, a valve plate sleeve is arranged at the center of the valve plate, the cross section of the valve plate sleeve is circular, a mounting hole is provided in the valve plate sleeve, the mounting hole is a flat hole passing through both axial ends of the valve plate, and the first valve plate connecting section is inserted into the mounting hole to form a detachable connection.

[0011] Furthermore, the upper valve shaft and the lower valve shaft are inserted into the flat hole through the second valve plate connecting section to form a through shaft of an integrated structure.

[0012] The present invention also provides a maintenance method for a stainless steel clamp butterfly valve. Based on the above-mentioned stainless steel clamp butterfly valve that is easy to maintain, the disassembly method during maintenance includes the following steps in sequence: S1. Remove the clamp from the clamp interfaces on both sides of the valve body; S2. Use an internal caliper to remove the retaining spring on the top of the valve body; S3. Pull out the upper valve shaft from the top of the valve body together with the lower valve shaft inserted in the flat hole of the upper valve shaft; S4. Remove the valve plate from the clamp interfaces on both sides of the valve body; S5. Remove the first backrest and the second backrest from the clamp interfaces on both sides of the valve body.

[0013] Furthermore, the installation method after replacing accessories during maintenance includes the following steps in sequence: S6, inserting the first backrest and the second backrest from the clamp interfaces on both sides of the valve body; S7, inserting the valve plate from the clamp interfaces on both sides of the valve body; S8, inserting the upper valve shaft together with the lower valve shaft inserted in the flat hole of the upper valve shaft from the top of the valve body; S9, installing the retaining spring on the top of the valve body with an internal caliper; S10, installing the clamps at the clamp interfaces on both sides of the valve body.

[0014] Compared with the prior art, the stainless steel clamp butterfly valve and maintenance method thereof which are easy to maintain described in the present invention have the following advantages: The stainless steel clamp butterfly valve described in the present invention, through the valve body, upper valve shaft, valve plate and lower valve shaft, this embodiment adopts flat holes and flat shafts to cooperate, which is helpful for automatic centering of the valve plate, thereby solving the problem of heavy torque caused by large symmetry error of the valve plate; the clamp interface can detachably connect the clamp, which is suitable for positions where flanges cannot be installed due to limited positions. In the later maintenance process, the clamp removal is faster and more convenient than the flange bolt removal; the clamp joints at both ends of the clamp butterfly valve can be replaced, and the valve plate and valve seat can be replaced, which solves the problem of the original clamp butterfly valve having one component damaged and the entire butterfly valve being scrapped. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings: Figure 1 This is a schematic diagram of the overall structure of the clamp butterfly valve according to an embodiment of the present invention; Figure 2 A schematic diagram of a valve plate and an upper valve shaft according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the valve plate and the bottom structure of the upper valve shaft according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the structure of the valve plate, the upper valve shaft and the lower valve shaft according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the structure of an existing butterfly valve according to an embodiment of the present invention; Figure 6 It is a schematic diagram of the bottom structure of an existing butterfly valve described in an embodiment of the present invention.

[0016] Description of reference numerals: 1-valve body; 2-shaft sleeve; 201-circlip; 3-upper valve shaft; 301-upper valve body connecting section; 302-first valve plate connecting section; 4-first backrest valve seat; 5-valve plate; 6-lower valve shaft; 601-second valve plate connecting section; 602-lower valve body connecting section; 7-clamp; 8-clamp interface; 9-second backrest valve seat; 10-flat hole; 11-valve plate sleeve; 13-installation hole; 20-segmented upper valve shaft; 21-segmented lower valve shaft; 22-round hole. DETAILED DESCRIPTION

[0017] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0018] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0019] like Figures 1 to 4As shown, the present embodiment is a stainless steel clamp butterfly valve which is easy to maintain, comprising a valve body 1, an upper valve shaft 3, a valve plate 5 and a lower valve shaft 6, wherein the upper valve shaft 3 comprises an upper valve body connecting section 301 and a first valve plate connecting section 302 which are connected in sequence from top to bottom; the upper valve body connecting section 301 is connected to the upper part of the valve body, and its cross section is circular, the first valve plate connecting section 302 is a flat shaft, and the first valve plate connecting section 302 of the upper valve shaft 3 passes through the center of the valve plate 5; a flat hole 10 is provided on the lower end surface of the upper valve shaft 3, and the flat hole 10 is along the The upper valve shaft 3 is provided with an axis center line, and the flat hole 10 extends from bottom to top to the corresponding position of the upper end of the valve plate 5; the lower valve shaft 6 is a flat shaft, including a lower valve body connecting section 602 and a second valve plate connecting section 601 connected in sequence from bottom to top; the lower valve body connecting section 602 is connected to the bottom of the valve body, the second valve plate connecting section 601 is inserted into the flat hole 10, and the second valve plate connecting section 601 penetrates the valve plate 5 from bottom to top; the outer diameter of the lower valve body connecting section 602 is smaller than the outer diameter of the first valve plate connecting section 302. Clamp interfaces 8 are respectively provided on both sides of the valve body 1, and the clamp interfaces 8 can be detachably connected to the clamp 7, and a clamp groove 701 for connecting with a pipeline is provided on the clamp 7.

[0020] like Figures 5 to 6 As shown, the existing butterfly valve structure adopts a two-section valve shaft, including a segmented upper valve shaft 20 and a segmented lower valve shaft 21. The segmented lower valve shaft 21 is cylindrical and is mounted on the bottom of the valve plate 5 through a circular hole 22. The existing valve plate butterfly valve mostly adopts a ductile iron rubber-wrapped structure.

[0021] Compared with the diameter of the existing circular hole 22, the flat hole used in this embodiment helps the valve plate to be automatically centered, thereby solving the problem of heavy torque caused by the large symmetry error of the valve plate; the upper valve shaft 3 used in this embodiment passes through the valve plate 5 from top to bottom, and is a through shaft. All the flat shafts inside the valve plate pass through to the bottom, and the valve plate is automatically centered, thereby solving the problem of heavy torque caused by the large symmetry error of the valve plate, which is beneficial to improve the operating performance of the electrically controlled clamp butterfly valve. In addition, the upper valve shaft 3, valve plate 5 and lower valve shaft 6 of this embodiment can be made of stainless steel to replace the existing ductile iron rubber-coated valve plate, which is more widely applicable. In addition, the valve plate can be made of stainless steel, bidirectional stainless steel, alloy plate, rubber-coated plate and other materials according to the medium, and the valve seat can be made of rubber material to improve the sealing type; like Figure 1 As shown, the clamp interface 8 is provided with an internal thread, and the clamp 7 is provided with an external thread; the clamp interface 8 and the clamp 7 are detachably connected through the internal thread and the external thread. The upper valve shaft 3 is fitted with the first backrest valve seat 4 and the second backrest valve seat 9, which are assembled in the valve body 1 and are respectively located at the upper end and the lower end of the valve plate 5. The side end faces of the first backrest valve seat 4 and the second backrest valve seat 9 abut against the end face of the clamp 7. The first backrest valve seat 4 and the second backrest valve seat 9 play the role of sealing and positioning.

[0022] In the preferred embodiment, the first backrest valve seat 4 and the second backrest valve seat 9 are provided with mounting through holes, and the upper valve shaft 3 is inserted into the mounting through holes to form a detachable connection. A connecting belt is provided between the first backrest valve seat 4 and the second backrest valve seat 9, and the connecting belt connects the first backrest valve seat 4 and the second backrest valve seat 9 as an integral component. The first backrest valve seat 4 and the second backrest valve seat 9 are detachable for replacement. Among them, the first backrest valve seat 4 and the second backrest valve seat 9 are connected as an integral component by making a connecting belt with a vulcanizing machine, which is convenient for replacement and installation. The upper part of the upper valve body connecting section 301 is assembled in the valve body 1 through the shaft sleeve 2 and the retaining ring 201. The upper valve shaft 3 can be removed by removing the retaining ring 201.

[0023] like Figure 1 and Figure 4 As shown, a valve plate sleeve 11 is arranged at the center of the valve plate 5, and the cross section of the valve plate sleeve 11 is circular. The valve plate sleeve 11 is provided with a mounting hole 13, and the mounting hole 13 is a flat hole that runs through the two ends of the valve plate axial direction. The first valve plate connecting section 302 of the upper valve shaft 3 is inserted into the mounting hole 13 to form a detachable connection. The upper valve shaft 3 and the lower valve shaft 6 are plugged into the flat hole 10 through the second valve plate connecting section 601 to form a through shaft of an integrated structure. The adoption of this structure can not only improve the strength of the upper valve shaft 3 and the lower valve shaft 6, but also when the upper valve shaft 3 is pulled out from the top of the valve body 1, the lower valve shaft 6 plugged into the flat hole 10 of the upper valve shaft 3 can be pulled out together, which is convenient for disassembly and installation.

[0024] The stainless steel clamp butterfly valve that is easy to maintain described in this embodiment is suitable for locations where flanges cannot be installed due to limited positions, especially when the position is too narrow and bolts cannot be installed, the valve can be connected through the clamp; in the later maintenance process, the clamp removal is faster and easier than the flange bolt removal. Compared with the existing round hole diameter, the flat hole used in this embodiment helps the valve plate to automatically align, thereby solving the problem of heavy torque caused by the large symmetry error of the valve plate; the clamps at both ends of the clamp butterfly valve can be replaced, and the valve plate and valve seat can be replaced, replacing the original disposable fire clamp butterfly valve. If one component is damaged, the entire machine will be scrapped.

[0025] The present embodiment also provides a maintenance method for a stainless steel clamp butterfly valve. Based on the above-mentioned stainless steel clamp butterfly valve that is easy to maintain, the disassembly method during maintenance includes the following steps in sequence: S1. Remove the clamp 7 from the clamp interfaces 8 on both sides of the valve body 1; S2. Use an internal caliper to remove the retaining spring 201 on the top of the valve body 1; S3. Pull out the upper valve shaft 3 from the top of the valve body 1 together with the lower valve shaft 6 inserted in the flat hole 10 of the upper valve shaft 3; S4. Remove the valve plate 5 from the clamp interfaces 8 on both sides of the valve body 1; S5. Remove the first backrest 4 and the second backrest 9 from the clamp interfaces 8 on both sides of the valve body 1.

[0026] The installation method after replacing accessories during maintenance includes the following steps in sequence: S6, inserting the first backrest 4 and the second backrest 9 from the clamp interfaces 8 on both sides of the valve body 1; S7, inserting the valve plate 5 from the clamp interfaces 8 on both sides of the valve body 1; S8, inserting the upper valve shaft 3 together with the lower valve shaft 6 inserted into the flat hole 10 of the upper valve shaft 3 from the top of the valve body 1; S9, installing the retaining ring on the top of the valve body 1 with an internal caliper; S10, installing the clamp 7 at the clamp interfaces 8 on both sides of the valve body 1.

[0027] The maintenance method of a stainless steel clamp butterfly valve described in this embodiment can replace the clamp joints at both ends of the clamp butterfly valve, and the valve plate and valve seat can be replaced during the later maintenance process. It is easy to disassemble and install, and the maintenance is convenient and fast. This solves the problem that the original clamp butterfly valve is difficult to repair and the entire butterfly valve must be scrapped if one component is damaged.

[0028] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A stainless steel clamp butterfly valve that is easy to maintain, comprising a valve body (1), an upper valve shaft (3), a valve plate (5) and a lower valve shaft (6), characterized in that: The upper valve shaft (3) comprises an upper valve body connecting section (301) and a first valve plate connecting section (302) which are connected in sequence from top to bottom; the upper valve body connecting section (301) is connected to the upper part of the valve body and has a circular cross-section; the first valve plate connecting section (302) is a flat shaft; the first valve plate connecting section (302) of the upper valve shaft (3) passes through the center of the valve plate (5); a flat hole (10) is provided on the lower end surface of the upper valve shaft (3); the flat hole (10) is arranged along the axis of the upper valve shaft (3); and the flat hole (10) extends from bottom to top to a corresponding position on the upper end of the valve plate (5); The lower valve shaft (6) is a flat shaft, comprising a lower valve body connecting section (602) and a second valve plate connecting section (601) connected in sequence from bottom to top; the lower valve body connecting section (602) is connected to the bottom of the valve body, the second valve plate connecting section (601) is inserted into the flat hole (10), and the second valve plate connecting section (601) passes through the valve plate (5) from bottom to top; the outer diameter of the lower valve body connecting section (602) is smaller than the outer diameter of the first valve plate connecting section (302); Clamp interfaces (8) are respectively provided on both sides of the valve body (1); the clamp interfaces (8) are detachably connected to the clamp (7); and a clamp groove (701) for connecting to a pipeline is provided on the clamp (7).

2. The stainless steel clamp butterfly valve that is easy to maintain according to claim 1 is characterized in that: An internal interface thread is provided in the clamp interface (8), and an external thread is provided on the clamp (7); the clamp interface (8) and the clamp (7) are detachably connected through the cooperation of the internal thread and the external thread.

3. The stainless steel clamp butterfly valve that is easy to maintain according to claim 1 is characterized in that: The upper valve shaft (3) is sleeved with a first backrest valve seat (4) and a second backrest valve seat (9); the first backrest valve seat and the second backrest valve seat are mounted in the valve body (1) and are located at the upper end and the lower end of the valve plate (5), respectively; the side end surfaces of the first backrest valve seat (4) and the second backrest valve seat (9) are in contact with the end surface of the clamp (7).

4. The stainless steel clamp butterfly valve that is easy to maintain according to claim 3 is characterized in that: The first backrest valve seat (4) and the second backrest valve seat (9) are provided with mounting through holes, and the upper valve shaft (3) is inserted into the mounting through holes to form a detachable connection.

5. The stainless steel clamp butterfly valve that is easy to maintain according to claim 1 is characterized in that: A connecting belt is provided between the first backrest valve seat (4) and the second backrest valve seat (9), and the connecting belt connects the first backrest valve seat (4) and the second backrest valve seat (9) into an integral component.

6. The stainless steel clamp butterfly valve that is easy to maintain according to claim 1 is characterized in that: The upper portion of the upper valve body connecting section (301) is mounted in the valve body (1) via a shaft sleeve (2) and a retaining ring (201).

7. The stainless steel clamp butterfly valve that is easy to maintain according to claim 1 is characterized in that: A valve plate sleeve (11) is arranged at the center of the valve plate (5). The cross section of the valve plate sleeve (11) is circular. The valve plate sleeve (11) is provided with a mounting hole (13). The mounting hole (13) is a flat hole that passes through both axial ends of the valve plate. The first valve plate connecting section 302 is inserted into the mounting hole (13) to form a detachable connection.

8. The stainless steel clamp butterfly valve that is easy to maintain according to claim 1 is characterized in that: The upper valve shaft (3) and the lower valve shaft (6) are inserted into the flat hole (10) via the second valve plate connecting section (601) to form a through shaft with an integrated structure.

9. A method for repairing a stainless steel clamp butterfly valve, based on the stainless steel clamp butterfly valve that is easy to repair as claimed in any one of claims 1 to 8, characterized in that: The disassembly method for maintenance includes the following steps in sequence: S1. Remove the clamps (7) from the clamp interfaces (8) on both sides of the valve body (1); S2. Use an internal caliper to remove the retaining ring (201) on the top of the valve body (1). S3. Pull out the upper valve shaft (3) together with the lower valve shaft (6) inserted into the flat hole (10) of the upper valve shaft (3) from the top of the valve body (1); S4. Remove the valve plate (5) from the clamp interfaces (8) on both sides of the valve body (1); S5. Remove the first backrest (4) and the second backrest (9) from the clamp interfaces (8) on both sides of the valve body (1).

10. The stainless steel clamp butterfly valve that is easy to maintain according to claim 9, characterized in that: The installation method after replacing the accessories during maintenance includes the following steps in sequence: S6. Insert the first backrest (4) and the second backrest (9) from the clamp interfaces (8) on both sides of the valve body (1). S7. Insert the valve plate (5) from the clamp interfaces (8) on both sides of the valve body (1); S8. Insert the upper valve shaft (3) from the top of the valve body (1) together with the lower valve shaft (6) inserted into the flat hole (10) of the upper valve shaft (3). S9. Install the retaining ring on the top of the valve body (1) using the internal caliper. S10. Install the clamps (7) on the clamp interfaces (8) on both sides of the valve body (1).

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