Gland type ball valve

Abstract

The utility model discloses a gland type ball valve which comprises a valve body and a gland, and the valve body and the gland are connected together through a plurality of connecting assemblies. The connecting assembly comprises a connecting rod, a first nut and a second nut, a first connecting flange is arranged on the valve body, a first through hole is formed in the first connecting flange, a first polygonal limiting groove is formed in the first through hole, a second connecting flange is arranged on the gland, a plurality of second through holes are formed in the second connecting flange, and second polygonal limiting grooves are formed in the second through holes. The first polygonal limiting groove and the second polygonal limiting groove are combined to form a limiting cavity, a polygonal limiting part is arranged in the middle of the connecting rod, a first threaded section and a second threaded section are arranged on the connecting rod, the two ends of the connecting rod penetrate through the first through hole and the second through hole respectively, and the polygonal limiting part is arranged in the limiting cavity. The first nut and the second nut are in threaded connection with the first threaded section and the second threaded section respectively. According to the utility model, the maintenance cost can be greatly reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of valve structures, in particular to a housing structure of a gland type ball valve. Background Art

[0002] Ball valves are widely used in fluid control. In fluid control applications, ball valves in pipelines are mainly used to open, close, distribute the flow of fluid media, change the flow direction and flow rate of fluid media, etc.

[0003] Generally, a ball valve on the market includes a housing, a valve cover, a valve stem and a ball. The valve cover is installed on the upper part of the housing. The valve stem passes through the valve cover and extends into the housing to be linked with the ball. A valve seat for forming a sealing fit with the valve seat when the valve is closed is installed inside the housing. The housing of the gland type ball valve usually includes two parts, a valve body and a gland, which are connected together by a bolt and nut combination. That is, corresponding through holes and screw holes need to be opened on the valve body and the gland respectively for cooperation with the bolts. However, in this connection method, after frequent disassembly, the internal threads of the screw holes will be damaged, or after long-term use, the internal threads of the screw holes will rust, resulting in the inability to smoothly connect the valve body and the gland, so that the entire valve body or gland needs to be replaced, and the maintenance cost is relatively high. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a gland type ball valve, which can avoid the situation that the entire valve body or gland needs to be replaced due to screw hole damage, and greatly reduces the maintenance cost.

[0005] To achieve the above purpose, the utility model provides the following technical solution: A gland type ball valve includes a valve body and a gland, and the valve body and the gland are connected together by a plurality of connection components; the connection components include a connecting rod, a first nut and a second nut. The valve body is provided with a first connecting flange, and a plurality of first through holes equal in number to the connection components are opened on the first connecting flange. A first polygonal limiting groove is provided at one end of the first through hole close to the gland. The gland is provided with a second connecting flange, and a plurality of second through holes corresponding to the first through holes are provided on the second connecting flange. A second polygonal limiting groove is provided at one end of the second through hole close to the valve body. When the valve body is connected to the gland, the first polygonal limiting groove and the corresponding second polygonal limiting groove form a limiting cavity. The middle part of the connecting rod is provided with a polygonal limiting part whose cross section is adapted to the limiting cavity. First threaded sections and second threaded sections are respectively provided at positions on the outer periphery of the connecting rod corresponding to both sides of the polygonal limiting part. Both ends of the connecting rod respectively penetrate through the first through hole and the second through hole, the polygonal limiting part is arranged in the limiting cavity, the first nut and the second nut are respectively threadedly connected to the first threaded section and the second threaded section of the connecting rod, and the first nut and the second nut are respectively abutted against the valve body and the gland.

[0006] By adopting the above technical solution, it is only necessary to respectively penetrate both ends of the connecting rod through the first through hole on the valve body and the second through hole on the gland, and then thread the first nut and the second nut onto the first threaded section and the second threaded section of the connecting rod respectively to lock the gland and the valve body together, thus realizing the installation of the gland and the valve body. And due to the special polygonal limiting part design on the connecting rod, which cooperates with the limiting cavity formed between the valve body and the gland, it can perform circumferential limitation on the connecting rod, and the two nuts can be installed or disassembled separately. Since this connection structure does not require drilling screw holes on the valve body or the gland, during maintenance, only the connecting rod or the two nuts need to be replaced, greatly reducing the maintenance cost.

[0007] The utility model is further configured such that the valve body and the gland are formed by forging.

[0008] By adopting the above technical solution, the structure is more firm and has a longer service life. Moreover, the forged structure can increase the airtightness of the valve body and the gland, and can avoid the generation of air bubbles and sand holes.

[0009] The utility model is further configured to further include a first shaft sleeve and a second shaft sleeve. The first shaft sleeve and the second shaft sleeve are respectively arranged in the first through hole and the second through hole. And one end of the first shaft sleeve away from the gland is provided with a first limiting flange extending outward in the circumferential direction, and the first limiting flange abuts against the outer end face of the first connecting flange. One end of the second shaft sleeve away from the valve body is provided with a second limiting flange extending outward in the circumferential direction, and the second limiting flange abuts against the outer end face of the second connecting flange. Both ends of the connecting rod respectively penetrate through the first shaft sleeve and the second shaft sleeve, and the first threaded section and the second nut respectively abut against the outer end faces of the first limiting flange and the second limiting flange.

[0010] By adopting the above technical solution, through the first shaft sleeve, it is avoided that the connecting rod, the first nut and the second nut directly contact the valve body or the gland, playing a role in protecting the valve body and the gland.

[0011] The utility model is further configured such that a plurality of first card slots for inserting tools are arranged on the outer circumference of the first limiting flange, and a plurality of second card slots for inserting tools are arranged on the outer circumference of the second limiting flange.

[0012] By adopting the above technical solution, it is beneficial to pry out the first shaft sleeve and the second shaft sleeve by tools in the later stage.

[0013] The present utility model is further configured such that a first relief groove is provided on the end face of the first connecting flange, the first connecting flange is embedded in the first relief groove, and a first clamping groove on the first connecting flange partially exposes outside the first relief groove; a second relief groove is provided on the end face of the second connecting flange, the second connecting flange is embedded in the second relief groove, and a second clamping groove on the second connecting flange partially exposes outside the second relief groove.

[0014] By adopting the above technical solution, on the basis of reducing the installation volume of the connecting component, the disassembly of the first shaft sleeve and the second shaft sleeve is not affected.

[0015] The present utility model is further configured such that the axial length of the limiting cavity is less than the axial length of the polygonal limiting portion.

[0016] By adopting the above technical solution, an integral axial floating gap between the valve body and the gland can be provided. The tighter the first nut and the second nut are screwed, the firmer their connection and the better the sealing performance.

[0017] The present utility model is further configured such that the cross-sectional shape of the polygonal limiting portion is a square or a regular hexagon.

[0018] By adopting the above technical solution, the processing is relatively convenient, and the polygonal limiting portion can play a good role in circumferential limiting when cooperating with the limiting cavity. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 is a perspective view of the whole of the present utility model;

[0020] Figure 2 is a front view of the whole of the present utility model;

[0021] Figure 3 is Figure 2 the A-A cross-sectional view of

[0022] Figure 4 is Figure 3 the enlarged structural schematic diagram of part B in

[0023] Figure 5 is a structural schematic diagram of the connecting component of the present utility model;

[0024] Figure 6 is a structural schematic diagram of the connecting rod of the present utility model.

[0025] In the figure: 1. Valve body; 2. gland; 3. connection assembly; 4. connecting rod; 5. first nut; 6. second nut; 7. first connection flange; 8. first through hole; 9. first polygonal limiting groove; 10. second connection flange; 11. second through hole; 12. second polygonal limiting groove; 13. limiting cavity; 14. polygonal limiting portion; 15. first thread section; 16. second thread section; 17. first shaft sleeve; 18. second shaft sleeve; 19. first limiting flange; 20. second limiting flange; 21. first card slot; 22. second card slot; 23. first relief groove; 24. second relief groove. Detailed implementation manner

[0026] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0027] Embodiment: As shown in the attached Figures 1 to 6The gland type ball valve shown includes a valve body 1 and a gland 2. The valve body 1 and the gland 2 are connected together by a plurality of connecting components 3, and a valve cavity is formed inside after the valve body 1 and the gland 2 are connected together. The connecting component 3 includes a connecting rod 4, a first nut 5 and a second nut 6. A first connecting flange 7 is provided on the valve body 1. A plurality of first through holes 8 with a quantity equivalent to that of the connecting components 3 are provided on the first connecting flange 7. A first polygonal limiting groove 9 is provided at one end of the first through hole 8 close to the gland 2. A second connecting flange 10 is provided on the gland 2. A plurality of second through holes 11 corresponding to the first through holes 8 are provided on the second connecting flange 10. A second polygonal limiting groove 12 is provided at one end of the second through hole 11 close to the valve body 1. When the valve body 1 and the gland 2 are connected, the first polygonal limiting groove 9 and the corresponding second polygonal limiting groove 12 form a limiting cavity 13. A polygonal limiting portion 14 with a cross-section adapted to the limiting cavity 13 is provided in the middle of the connecting rod 4. First thread segments 15 and second thread segments 16 are respectively provided at positions on the outer periphery of the connecting rod 4 on both sides of the polygonal limiting portion 14. Both ends of the connecting rod 4 respectively penetrate through the first through hole 8 and the second through hole 11. The polygonal limiting portion 14 is arranged in the limiting cavity 13. The first nut 5 and the second nut 6 have the same specification and are respectively threadedly connected to the first thread segment 15 and the second thread segment 16 of the connecting rod 4, and the first nut 5 and the second nut 6 respectively abut against the valve body 1 and the gland 2. Just penetrate both ends of the connecting rod 4 through the first through hole 8 on the valve body 1 and the second through hole 11 on the gland 2 respectively, then threadedly connect the first nut 5 and the second nut 6 to the first thread segment 15 and the second thread segment 16 of the connecting rod 4 respectively, and lock the gland 2 and the valve body 1 together, then the installation of the gland 2 and the valve body 1 can be realized. And due to the special design of the polygonal limiting portion 14 on the connecting rod 4, which cooperates with the limiting cavity 13 formed between the valve body 1 and the gland 2, circumferential limitation of the connecting rod 4 can be carried out, and the two nuts can be installed or disassembled separately. Since this connection structure does not need to open screw holes on the valve body 1 or the gland 2, during maintenance, only the connecting rod 4 or the two nuts need to be replaced, which greatly reduces the maintenance cost.

[0028] Wherein, the valve body 1 and the gland 2 are formed by forging. Compared with the integrally formed structure on the market, the forging structure is more firm, has a longer service life, and the forging structure can increase the airtightness of the valve body 1 and the gland 2 and can avoid the generation of air bubbles and sand holes.

[0029] As attached Figures 3 to 5As shown in the figure, it further includes a first bushing 17 and a second bushing 18. The first bushing 17 and the second bushing 18 are respectively arranged in the first through hole 8 and the second through hole 11. The outer circumferential surface of the first bushing 17 is in close fit with the inner circumferential surface of the first through hole 8, and the outer circumferential surface of the second bushing 18 is in close fit with the inner circumferential surface of the second through hole 11. Moreover, one end of the first bushing 17 away from the gland 2 is provided with a first limiting flange 19 extending outward in the circumferential direction. The first limiting flange 19 abuts against the outer end surface of the first connecting flange 7. One end of the second bushing 18 away from the valve body 1 is provided with a second limiting flange 20 extending outward in the circumferential direction. The second limiting flange 20 abuts against the outer end surface of the second connecting flange 10. Both ends of the connecting rod 4 penetrate through the first bushing 17 and the second bushing 18 respectively, and the first threaded section 15 and the second nut 6 respectively abut against the outer end surfaces of the first limiting flange 19 and the second limiting flange 20. Through the first bushing 17, it is avoided that the connecting rod 4, the first nut 5 and the second nut 6 directly contact the valve body 1 or the gland 2, playing a role in protecting the valve body 1 and the gland 2.

[0030] As shown in the attached Figure 4 drawing and the attached Figure 5 drawing, a plurality of first card slots 21 for inserting tools are arranged on the outer circumference of the first limiting flange 19, and a plurality of second card slots 22 for inserting tools are arranged on the outer circumference of the second limiting flange 20. This design is conducive to prying out the first bushing 17 and the second bushing 18 by tools in the later stage.

[0031] As shown in the attached Figure 4 drawing, a first relief groove 23 is provided on the end surface of the first connecting flange 7. The first connecting flange 7 is embedded in the first relief groove 23, and a part of the first card slot 21 on the first connecting flange 7 is exposed outside the first relief groove 23. A second relief groove 24 is provided on the end surface of the second connecting flange 10. The second connecting flange 10 is embedded in the second relief groove 24, and a part of the second card slot 22 on the second connecting flange 10 is exposed outside the second relief groove 24. This design can reduce the installation volume of the connecting component 3 without affecting the disassembly of the first bushing 17 and the second bushing 18.

[0032] As shown in the attached Figure 4 drawing, the axial length of the limiting cavity 13 is less than the axial length of the polygonal limiting portion 14. This design can provide a floating gap in the axial direction of the integrated valve body 1 and the gland 2. The tighter the first nut 5 and the second nut 6 are screwed, the firmer their connection is and the better the sealing performance is.

[0033] In addition, the cross-sectional shape of the polygonal limiting portion 14 is a square or a regular hexagon. This design is relatively convenient for processing, and the polygonal limiting portion 14 can play a good role in circumferential limiting when cooperating with the limiting cavity 13.

Claims

1. A gland-type ball valve, comprising a valve body (1) and a gland (2), wherein the valve body (1) and the gland (2) are connected together via a plurality of connecting components (3); characterized in that: The connecting assembly (3) comprises a connecting rod (4), a first nut (5) and a second nut (6); the valve body (1) is provided with a first connecting flange (7); the first connecting flange (7) is provided with a plurality of first through holes (8) whose number is equal to that of the connecting assembly (3); the first through hole (8) is provided with a first polygonal limiting groove (9) at one end close to the gland (2); the gland (2) is provided with a second connecting flange (10); the second connecting flange (10) is provided with a plurality of second through holes (11) corresponding to the first through holes (8); the second through hole (11) is provided with a second polygonal limiting groove (12) at one end close to the valve body (1); when the valve body (1) is connected to the gland (2), the first polygonal limiting groove (9) and the corresponding second through holes (11) are connected to each other. The polygonal limiting grooves (12) are combined to form a limiting cavity (13); a polygonal limiting portion (14) having a cross section adapted to the limiting cavity (13) is provided in the middle of the connecting rod (4); a first thread segment (15) and a second thread segment (16) are respectively provided at positions on the outer circumference of the connecting rod (4) corresponding to the two sides of the polygonal limiting portion (14); two ends of the connecting rod (4) respectively penetrate the first through hole (8) and the second through hole (11); the polygonal limiting portion (14) is arranged in the limiting cavity (13); the first nut (5) and the second nut (6) are respectively threadedly connected to the first thread segment (15) and the second thread segment (16) of the connecting rod (4); and the first nut (5) and the second nut (6) are respectively threadedly pressed against the valve body (1) and the gland (2).

2. The gland type ball valve according to claim 1, characterized in that: The valve body (1) and the gland (2) are formed by forging.

3. The gland type ball valve according to claim 1, characterized in that: The valve body (1) further comprises a first sleeve (17) and a second sleeve (18), wherein the first sleeve (17) and the second sleeve (18) are respectively arranged in the first through hole (8) and the second through hole (11), and the first sleeve (17) is provided with a first limiting flange (19) extending toward the periphery at one end away from the gland (2), and the first limiting flange (19) is tightly abutted against the outer end surface of the first connecting flange (7); the second sleeve (18) is provided with a second limiting flange (20) extending toward the periphery at one end away from the valve body (1), and the second limiting flange (20) is tightly abutted against the outer end surface of the second connecting flange (10); the two ends of the connecting rod (4) respectively pass through the first sleeve (17) and the second sleeve (18), and the first threaded section (15) and the second nut (6) are respectively tightly abutted against the outer end surfaces of the first limiting flange (19) and the second limiting flange (20).

4. The gland type ball valve according to claim 3, characterized in that: The outer periphery of the first limiting flange (19) is provided with a plurality of first slots (21) for inserting tools, and the outer periphery of the second limiting flange (20) is provided with a plurality of second slots (22) for inserting tools.

5. The gland type ball valve according to claim 4, characterized in that: A first clearance groove (23) is provided on the end surface of the first connecting flange (7), the first connecting flange (7) is embedded in the first clearance groove (23), and a first clamping groove (21) on the first connecting flange (7) is partially exposed outside the first clearance groove (23); a second clearance groove (24) is provided on the end surface of the second connecting flange (10), the second connecting flange (10) is embedded in the second clearance groove (24), and a second clamping groove (22) on the second connecting flange (10) is partially exposed outside the second clearance groove (24).

6. The gland type ball valve according to claim 1, characterized in that: The axial length of the limiting cavity (13) is smaller than the axial length of the polygonal limiting portion (14).

7. The gland type ball valve according to claim 1, characterized in that: The cross-sectional shape of the polygonal limiting portion (14) is a square or a regular hexagon.

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