Plug assembly device for plug valve

Abstract

A plug assembly device for a plug valve, belonging to the technical field of valve assembly. The plug assembly device comprises a drive screw (12) and a sleeve (13), wherein lower ends of a plurality of support studs (7) are respectively connected to a base (6), and upper ends of the plurality of support studs (7) are respectively connected to a support plate (10); a pressing ring (8) is in sliding fit with the plurality of support studs (7); the drive screw (12) is in threaded fit with a drive nut (11); and the sleeve (13) is formed by detachably connecting and assembling two semi-tubular members (23). During assembly of the plug valve, the two semi-tubular members (23) first respectively press two valve seats (2) into two annular grooves, and then the two semi-tubular members (23) are connected to each other to form the sleeve (13); the base (6) is connected to the valve body (1); the sleeve (13) is coaxial with a valve cavity hole (16); the pressing ring (8) presses the sleeve (13) onto a valve body (1); a lower end of the drive screw (12) is connected to a plug (4); the drive nut (11) is located on a lower side of the support plate (10); the drive nut (11) is screwed upwards while engaging with the drive screw (12); and the plug (4) can be pressed into the valve cavity hole (16) by means of the drive screw (12), thereby effectively solving the problem of the plug of the plug valve being difficult to mount.

Description

A plug valve plug assembly device Technical Field

[0001] This invention belongs to the field of valve assembly technology, and particularly relates to a plug valve plug assembly device. Background Technology

[0002] A plug valve is a type of valve that uses a perforated plug as a sealing element. By rotating the plug with a drive mechanism, the opening on the plug connects to or closes with the flow channel in the valve body, thus achieving the valve's on / off function. Plug valves are simple in structure, quick to open and close, and have low fluid resistance. However, they rely on the precision-machined valve seat sealing surface and the valve body for direct contact to achieve a seal, resulting in high opening and closing torque and easy wear of the sealing surface.

[0003] To ensure a tight seal, plug valves are designed with a combined elastic disc on the back of the valve seat. Before installation, the elastic disc is uncompressed, and the outer diameter of the valve seat sealing surface is larger than the inner diameter of the valve body, preventing the plug from being directly installed inside. Only when the elastic disc is compressed and deformed by external force, making the outer diameter of the valve seat sealing surface less than or equal to the inner diameter of the valve body, can it be installed. Therefore, during installation and removal of the plug, the spring force generated by the compressed deformation of the elastic disc pushes the valve seat and valve body tightly together, requiring significant external force to overcome the friction between them. Incorrect installation or forceful installation can easily damage the valve seat sealing surface, compromising the valve's sealing performance even after installation. Technical issues

[0004] The purpose of this invention is to provide a plug valve assembly device to solve the problem of difficult plug valve assembly. The technical solution adopted by this invention is as follows: Technical solutions

[0005] A plug valve assembly device is disclosed. The plug valve includes a valve body, a plug, and two valve seats. The valve body has a vertically penetrating valve cavity and a horizontally penetrating medium inlet / outlet. The axis of the valve cavity is perpendicular to the axis of the medium inlet / outlet. Two valve covers respectively seal both ends of the valve cavity. The plug includes a drive shaft head, a plug body, and a positioning shaft head coaxially connected from top to bottom. A threaded blind hole is machined on the upper end face of the drive shaft head. Annular grooves are machined on both sides of the outer periphery of the plug body, and a horizontally penetrating opening / closing hole is provided on the plug body. The drive shaft head passes through the upper valve cover and rotates and seals with the upper valve cover. The upper end face of the lower valve cover is provided with a positioning groove, and the positioning shaft head rotates and engages with the positioning groove. The valve seat is ring-shaped, and the connecting end face of the two valve seats abuts against the bottom of the two annular grooves respectively through elastic discs. The sealing end face of the two valve seats rotates and seals with the valve cavity hole respectively. When the valve is opened, the opening and closing hole communicates with the medium inlet and outlet hole to form a medium flow channel. When the valve is closed, the two valve seats respectively seal the two sides of the medium inlet and outlet hole.

[0006] The assembly device includes a base, support studs, pressure rings, a support plate, a drive screw, and a sleeve. The lower ends of several support studs are connected to the base, and the upper ends of several support studs are connected to the support plate. The pressure ring is slidably engaged with several support studs. A second nut is provided on the support stud. A flange is provided on the outer periphery of the sleeve. A square post is provided at the upper end of the drive screw, which can be engaged with a wrench. The drive screw passes vertically through the support plate. The drive nut is threadedly engaged with the drive screw. The sleeve is composed of two semi-tubular components that can be detachably connected and assembled. The inner diameter of the sleeve is smaller than the inner diameter of the valve cavity.

[0007] When assembling the plug valve, the drive nut is located on the lower side of the support plate. First, the two semi-tubular components press the two valve seats into the two annular grooves respectively, so that the two sets of elastic discs are compressed and deformed. Then, the two semi-tubular components are connected to form a sleeve. Next, the base is connected to the valve body, so that the lower end of the sleeve passes through the base and abuts against the valve body. The sleeve is coaxial with the valve cavity hole. The lower end of the drive screw is connected to the threaded blind hole. The second nut is screwed on. Several second nuts press the pressure ring on the flange. Finally, the square post is fixed with a wrench to prevent the drive screw from rotating. The drive nut is screwed on upward, and the drive screw is moved down by the thread principle, and the plug is pressed into the valve cavity hole.

[0008] When disassembling the plug valve, the drive nut is located on the upper side of the support plate. First, connect the base to the valve body so that the lower end of the sleeve passes through the base and abuts against the valve body. The sleeve is coaxial with the valve cavity hole. The lower end of the drive screw is connected to the threaded blind hole. Tighten the second nut. Several second nuts press the pressure ring onto the flange. Then, use a wrench to fix the square post to prevent the drive screw from rotating. Tighten the drive nut downwards. Utilize the thread principle to move the drive screw upwards and pull the plug into the sleeve. Next, disassemble the assembly device from the valve body. Finally, disassemble the sleeve into two semi-tubular components and remove the plug.

[0009] Furthermore, the lower end of the sleeve is provided with a pointed ring structure, which is adapted to the upper chamfer of the valve cavity hole. When assembling the plug valve, the pointed ring structure is matched with the upper chamfer stop of the valve cavity hole.

[0010] Furthermore, a third nut is provided at the bottom of the drive screw, which is used to lock the drive screw when it is connected to the threaded blind hole.

[0011] Furthermore, if we define the inner diameter of the valve cavity as φD3 and the inner diameter of the sleeve as φD2, then φD2 is 0.1mm smaller than φD3.

[0012] Furthermore, the surface roughness of the inner hole of the sleeve is less than or equal to Ra0.2.

[0013] Furthermore, the valve body is provided with several flange blind holes for connection with the valve cover. The base consists of two connecting blocks. The bottom of the connecting blocks is provided with threaded studs. The threaded studs of the two connecting blocks are respectively engaged with any two opposite threads in the above flange blind holes, so that the two connecting blocks are respectively arranged on opposite sides of the valve cavity hole. There are two supporting studs, and the lower ends of the supporting studs are respectively connected to the two connecting blocks.

[0014] Furthermore, the top of the support stud is provided with two first nuts, which are respectively abutted and locked against the upper and lower end faces of the support plate. Beneficial effects

[0015] Because the sleeve is composed of two detachably connected semi-tubular components, it can be disassembled into two semi-tubular components, creating sufficient space between them. This space is much larger than the distance between the sealing surfaces of the two valve seats when the elastic disc is not compressed, facilitating the accommodation of the assembled plug and valve seat. After connecting the two semi-tubular components to form the sleeve, aligning the sleeve with the valve cavity hole, and since the inner diameter of the sleeve is smaller than the diameter of the valve cavity hole, tightening the drive nut, under the pressure of the drive screw, allows the plug to be smoothly pressed into the valve cavity hole, effectively solving the problem of difficult installation of the plug in a plug valve. This invention has a simple structure and is easy to operate. Attached Figure Description

[0016] Figure 1 is a schematic diagram of the structure of the present invention;

[0017] Figure 2 is a schematic diagram of the plug valve;

[0018] Figure 3 is a cross-sectional view of the valve body;

[0019] Figure 4 is a schematic diagram of the assembly of the valve plug and valve seat;

[0020] Figure 5 is an enlarged view of point A in Figure 1;

[0021] Figure 6 is an axial view of the valve seat connection end;

[0022] Figure 7 is a cross-sectional view of the valve seat;

[0023] Figure 8 is a schematic diagram showing the state of disassembling the valve according to the present invention;

[0024] Figure 9 is a schematic diagram of the rough machining of the inner hole of the sleeve and its cutting into two semi-tubular components;

[0025] Figure 10 is a schematic diagram of the inner hole being finished after two semi-tubular components are combined to form a sleeve;

[0026] Figure 11 is a cross-sectional view of the connecting block;

[0027] Figure 12 is a bottom view of Figure 11.

[0028] In the diagram, 1. Valve body, 2. Valve seat, 3. Elastic disc, 4. Plug, 5. Valve cover, 6. Base, 7. Support stud, 8. Pressure ring, 9. First nut, 10. Support plate, 11. Drive nut, 12. Drive screw, 13. Sleeve, 14. Square post, 15. Second nut, 16. Valve cavity hole, 17. Medium inlet / outlet hole, 18. Threaded blind hole, 19. Drive shaft head, 20. Plug body, 21. Positioning shaft head, 22. Third nut, 23. Semi-tubular component, 24. Opening / closing hole, 25. Sharp-angle ring structure, 26. Connecting block, 27. Threaded head. Embodiments of the present invention

[0029] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0030] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0031] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0032] Example: As shown in Figures 1-12, a plug valve assembly device is provided. The plug valve includes a valve body 1, a plug 4, and two valve seats 2. The valve body 1 has a vertically penetrating valve cavity 16 and a horizontally penetrating medium inlet / outlet hole 17. The axis of the valve cavity 16 intersects perpendicularly with the axis of the medium inlet / outlet hole 17. Two valve covers 5 respectively seal the two ends of the valve cavity 16. The plug 4 includes a drive shaft head 19, a plug body 20, and a positioning shaft head 21 coaxially connected from top to bottom. A threaded blind hole 18 is machined on the upper end surface of the drive shaft head 19. Annular grooves are machined on both sides of the outer periphery of the plug body 20. The axis of the annular groove intersects perpendicularly with the axis of the plug 4. The plug body 20 has a horizontally penetrating opening and closing mechanism. The opening and closing hole 24 is perpendicular to the axis of the plug 4. The drive shaft head 19 passes through the upper valve cover 5 and rotates and seals with the upper valve cover 5. The upper end face of the lower valve cover 5 is provided with a positioning groove. The positioning shaft head 21 is inserted into the positioning groove and rotates and seals with the positioning groove. The valve seat 2 is ring-shaped. The connecting end faces of the two valve seats 2 respectively abut against the bottom of the two annular grooves through the elastic disc 3. The arc-shaped sealing end faces of the two valve seats 2 respectively rotate and seal with the valve cavity hole 16. When the valve is opened, the opening and closing hole 24 communicates with the medium inlet and outlet hole 17 to form a medium flow channel. When the valve is closed, the two valve seats 2 respectively seal the two sides of the medium inlet and outlet hole 17.

[0033] The assembly device includes a base 6, support studs 7, pressure rings 8, support plates 10, drive screws 12, and sleeves 13. The lower ends of several support studs 7 are connected to the base 6, and the upper ends of several support studs 7 are connected to the support plates 10. The pressure rings 8 are slidably engaged with several support studs 7. A second nut 15 is provided on the support studs 7. A flange is provided on the outer periphery of the sleeve 13. A square post 14 that can be engaged with a wrench is provided at the upper end of the drive screw 12. The drive screw 12 passes vertically through the support plates 10. The drive nut 11 is threadedly engaged with the drive screw 12. The sleeve 13 is composed of two semi-tubular components 23 that can be detachably connected and assembled. The inner diameter of the sleeve 13 is smaller than the inner diameter of the valve cavity hole 16.

[0034] When assembling the plug valve, the drive nut 11 is located on the lower side of the support plate 10. First, the two semi-tubular components 23 respectively press the two valve seats 2 into the two annular grooves, so that the two sets of elastic discs 3 are compressed and deformed. Then, the two semi-tubular components 23 are connected to form a sleeve 13. Next, the base 6 is connected to the valve body 1, so that the lower end of the sleeve 13 passes through the base 6 and abuts against the valve body 1. The sleeve 13 is coaxial with the valve cavity hole 16. The lower end of the drive screw 12 is connected to the threaded blind hole 18. The second nut 15 is screwed on. Several second nuts 15 press the pressure ring 8 on the flange. Finally, the square post 14 is fixed with a wrench to prevent the drive screw 12 from rotating. The drive nut 11 is screwed on upward, and the drive screw 12 is moved down by the thread principle, and the plug 4 is pressed into the valve cavity hole 16.

[0035] When disassembling the plug valve, the drive nut 11 is located on the upper side of the support plate 10. First, connect the base 6 to the valve body 1, so that the lower end of the sleeve 13 passes through the base 6 and abuts against the valve body 1. The sleeve 13 is coaxial with the valve cavity hole 16. The lower end of the drive screw 12 is connected to the threaded blind hole 18. Tighten the second nut 15. Several second nuts 15 press the pressure ring 8 on the flange. Then, use a wrench to fix the square post 14 to prevent the drive screw 12 from rotating. Tighten the drive nut 11 downwards. Use the thread principle to move the drive screw 12 upwards and pull the plug 4 into the sleeve 13. Then, disassemble the assembly device from the valve body 1. Finally, split the sleeve 13 into two semi-tubular components 23 and take out the plug 4.

[0036] The lower end of the sleeve 13 is provided with a pointed ring structure 25, which is adapted to the upper chamfer of the valve cavity 16. When assembling the plug valve, the pointed ring structure 25 and the upper chamfer stop of the valve cavity 16 are engaged. The stop engagement facilitates the positioning of the sleeve 13 and the valve cavity 16.

[0037] A third nut 22 is provided at the bottom of the drive screw 12. When the drive screw 12 is connected to the threaded blind hole 18, it is locked by the third nut 22. The third nut is used as a back nut to prevent the drive screw 12 from retracting between the drive screw 12 and the threaded blind hole 18.

[0038] Define the inner diameter of valve cavity 16 as φD3 and the inner diameter of sleeve 13 as φD2, then φD2 is 0.1mm smaller than φD3.

[0039] The surface roughness of the inner bore of sleeve 13 is less than or equal to Ra0.2. Reducing the roughness of sleeve 13 makes it easier to press the plug 4 into the valve chamber 16.

[0040] The valve body 1 is provided with several flange blind holes for connecting to the valve cover 5. The base 6 is composed of two connecting blocks 26. The bottom of the connecting block 26 is provided with a threaded stud 27. The threaded stud 27 of the two connecting blocks 26 respectively engages with any two opposite threads in the above flange blind holes, so that the two connecting blocks 26 are respectively arranged on opposite sides of the valve cavity hole 16. There are two supporting studs 7, and the lower ends of the supporting studs 7 are respectively connected to the two connecting blocks 26.

[0041] The top of the support stud 7 is provided with two first nuts 9, which are respectively abutted and locked against the upper and lower end faces of the support plate 10.

[0042] When machining sleeve 13, first rough machine the inner diameter of sleeve 13 to φD1, so that φD1 is 2mm smaller than φD3. Then, use wire cutting technology to cut sleeve 13 into two semi-tubular components 23. Then connect the two semi-tubular components 23 with hexagonal bolts to re-form sleeve 13. Finally, finish machine the inner diameter of sleeve 13 to φD2, so that φD2 is 0.1mm smaller than φD3.

[0043] When assembling the plug valve using the present invention, firstly, the two sets of elastic discs 3 are respectively installed into the two annular grooves. Secondly, the connecting ends of the two valve seats 2 are respectively inserted into the two annular grooves. Then, the sleeve 13 is split into two semi-tubular components 23, so that the two semi-tubular components 23 are radially pressed against the two valve seats 2. The elastic discs 3 are deformed under pressure, so that the two valve seats 2 are completely pressed into the corresponding annular grooves. Then, the two semi-tubular components 23 are connected to form the sleeve 13, so that the plug 4, valve seat 2 and elastic disc 3 are all in the sleeve 13. Finally, the device of the present invention is connected to the valve body 1, the drive screw 12 is connected to the threaded blind hole 18, so that the upper end of the sleeve 13 is aligned with the valve cavity hole 16. The square post 14 is fixed with a wrench, and the drive nut 11 is screwed in, so that the plug 4 can be pressed into the valve cavity hole 16 by the drive screw 12.

[0044] Since the sleeve 13 is composed of two detachably connected semi-tubular components 23, it can be disassembled into two semi-tubular components 23, creating sufficient space between them. This space is much larger than the distance between the sealing surfaces of the two valve seats 2 when the elastic disc 3 is not compressed, facilitating the accommodation of the assembled plug 4 and valve seat 2. After connecting the two semi-tubular components 23 to form the sleeve 13, the sleeve 13 is aligned with the valve cavity hole 16. Since the inner diameter of the sleeve 13 is smaller than the diameter of the valve cavity hole 16, the drive screw 12 is turned. Under the pressure of the drive screw 12, the plug 4 can be smoothly pressed into the valve cavity hole 16, effectively solving the problem of the plug being difficult to install in a plug valve. This invention has a simple structure and is easy to operate.

[0045] When disassembling the plug valve, the reverse steps are used. It should be noted that, in order to facilitate pulling the plug 4 into the sleeve 13 through the valve cavity hole 16, the two semi-tubular components 23 do not need to be connected too tightly when assembling the sleeve 13. That is, the two semi-tubular components 23 can be left with a certain gap so that the inner hole of the sleeve 13 is larger than the diameter of the valve cavity hole 16.

[0046] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A plug valve assembly device, wherein the plug valve includes a valve body (1), a plug (4) and two valve seats (2), the valve body (1) is provided with a valve cavity hole (16) that runs vertically through and a medium inlet / outlet hole (17) that runs horizontally through, the axis of the valve cavity hole (16) intersects perpendicularly with the axis of the medium inlet / outlet hole (17), and two valve covers (5) respectively seal the two ends of the valve cavity hole (16), the plug (4) includes a drive shaft head (19), a plug body (20) and a positioning shaft head (21) that are coaxially connected from top to bottom, a threaded blind hole (18) is machined on the upper end surface of the drive shaft head (19), and an annular groove is machined on both sides of the outer periphery of the plug body (20), and a horizontal groove is provided on the plug body (20). The through opening and closing hole (24) is connected to the upper valve cover (5). The drive shaft head (19) passes through the upper valve cover (5) and rotates and seals with the upper valve cover (5). The upper end face of the lower valve cover (5) is provided with a positioning groove. The positioning shaft head (21) rotates and cooperates with the positioning groove. The valve seat (2) is in the shape of a ring. The connecting end face of the two valve seats (2) respectively abuts against the bottom of the two annular grooves through the elastic disc (3). The sealing end face of the two valve seats (2) respectively rotates and seals with the valve cavity hole (16). When the valve is opened, the opening and closing hole (24) is connected with the medium inlet and outlet hole (17) to form a medium flow channel. When the valve is closed, the two valve seats (2) respectively seal the two sides of the medium inlet and outlet hole (17). characterized in that The assembly device includes a base (6), support studs (7), pressure rings (8), support plates (10), drive screws (12), and sleeves (13). The lower ends of several support studs (7) are connected to the base (6), and the upper ends of several support studs (7) are connected to the support plates (10). The pressure rings (8) are slidably engaged with several support studs (7). A second nut (15) is provided on the support studs (7). A flange is provided on the outer periphery of the sleeve (13). A square post (14) that can be engaged with a wrench is provided on the upper end of the drive screw (12). The drive screw (12) passes vertically through the support plates (10). The drive nut (11) is threadedly engaged with the drive screw (12). The sleeve (13) is composed of two semi-tubular components (23) that can be detachably connected and assembled. The inner diameter of the sleeve (13) is smaller than the inner diameter of the valve cavity hole (16). When assembling the plug valve, the drive nut (11) is located on the lower side of the support plate (10). First, the two semi-tubular components (23) press the two valve seats (2) into the two annular grooves respectively, so that the two sets of elastic discs (3) are compressed and deformed. Then, the two semi-tubular components (23) are connected to form a sleeve (13). Next, the base (6) is connected to the valve body (1), so that the lower end of the sleeve (13) passes through the base (6) and abuts against the valve body (1). The sleeve (13) is coaxial with the valve cavity hole (16). The lower end of the drive screw (12) is connected to the threaded blind hole (18). The second nut (15) is screwed on. Several second nuts (15) press the pressure ring (8) on the flange. Finally, the square column (14) is fixed with a wrench to prevent the drive screw (12) from rotating. The drive nut (11) is screwed on upward. The drive screw (12) is moved down by the thread principle and the plug (4) is pressed into the valve cavity hole (16). When disassembling the plug valve, the drive nut (11) is located on the upper side of the support plate (10). First, connect the base (6) to the valve body (1), so that the lower end of the sleeve (13) passes through the base (6) and abuts against the valve body (1). The sleeve (13) is coaxial with the valve cavity hole (16). The lower end of the drive screw (12) is connected to the threaded blind hole (18). Tighten the second nut (15). Several second nuts (15) press the pressure ring (8) on the flange. Then, use a wrench to fix the square post (14) to prevent the drive screw (12) from rotating. Tighten the drive nut (11) downwards. Use the thread principle to move the drive screw (12) upwards and pull the plug (4) into the sleeve (13). Then, disassemble the assembly device from the valve body (1). Finally, split the sleeve (13) into two semi-tubular components (23) and take out the plug (4).

2. A faucet fitting according to claim 1, wherein: The lower end of the sleeve (13) is provided with a pointed ring structure (25), which is adapted to the upper chamfer of the valve cavity hole (16). When the plug valve is assembled, the pointed ring structure (25) is matched with the upper chamfer stop of the valve cavity hole (16).

3. A faucet fitting device for a faucet valve according to claim 1, characterized in that: The support plate (10) has a through hole, the drive nut (11) is connected to the support plate (10), and the drive screw (12) passes through the through hole on the support plate (10) and is threadedly engaged with the drive nut (11).

4. A faucet fitting device for a faucet valve according to claim 1, characterized in that: The bottom of the drive screw (12) is provided with a third nut (22), which is used to lock the drive screw (12) when it is connected to the threaded blind hole (18).

5. A faucet fitting device for a faucet valve according to claim 1, characterized in that: Define the inner diameter of the valve cavity (16) as φD3 and the inner diameter of the sleeve (13) as φD2, then φD2 is 0.1mm smaller than φD3.

6. A faucet fitting device for a faucet valve according to claim 1, characterized in that: The surface roughness of the inner hole of the sleeve (13) is less than or equal to Ra0.

2.

7. A faucet fitting device for a faucet valve according to claim 1, characterized in that: The valve body (1) is provided with several flange blind holes for connecting with the valve cover (5). The base (6) is composed of two connecting blocks (26). The bottom of the connecting block (26) is provided with a threaded stud (27). The threaded stud (27) of the two connecting blocks (26) respectively engages with any two opposite threads in the above flange blind holes, so that the two connecting blocks (26) are respectively arranged on opposite sides of the valve cavity hole (16). There are two supporting studs (7). The lower end of the supporting studs (7) is respectively connected to the two connecting blocks (26).

8. A faucet fitting according to any one of claims 1-7, characterized in that: The top of the support stud (7) is provided with two first nuts (9), which are respectively abutted and locked against the upper and lower end faces of the support plate (10).

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