Tail end structure of butterfly valve and vertically-installed butterfly valve

Abstract

The utility model discloses a tail end structure of a butterfly valve and a vertically-installed butterfly valve, and relates to the technical field of vertically-installed butterfly valves. The tail end structure comprises a screw rod which is vertically inserted into the end cover, a cylinder structure with the diameter larger than that of the screw rod is arranged at the top end of the screw rod, the cylinder structure is clamped in the end cover, and the bottom end of the lower valve shaft and the cylinder structure are arranged at an interval. The bottom end of the screw extends out of the bottom surface of the end cover and is in threaded fit with a corresponding nut; the friction pad is clamped between the lower valve shaft and the cylinder structure; the split ring is arranged in the circular ring groove in a sleeving manner and is clamped at the circular ring blocking eave in the stepped hole structure; a first set distance is formed between the upper ring face of the circular ring groove and the top face of the split ring, a second set distance is formed between the bottom end of the lower valve shaft and the top face of the cylinder structure, and the second set distance is smaller than the first set distance.

Description

TECHNICAL FIELD

[0001] The utility model relates to vertical installation butterfly valve technical field especially butterfly valve's tail end structure and vertical installation butterfly valve. BACKGROUND

[0002] Butterfly valve is widely applied because of small volume, light weight, convenient operation, having cut-off, regulating function, adapting to various medium parameter working conditions and installation working conditions (vertical installation of horizontal pipeline, horizontal installation of vertical pipeline), high performance price ratio. For vertical installation butterfly valve, it should have structure measure of keeping butterfly plate and valve seat "off position" concentric to ensure sealing performance and long service life.

[0003] Butterfly plate and valve shaft often adopt rigid connection, because of the influence of butterfly plate and valve shaft and other rotating components' own gravity, the contact surface between the support surface in the valve body and the rotating component will cause the sinking of the rotating component due to friction and wear or manufacturing cumulative error, which will affect the sealing performance and the service life of the sealing pair, and the problem is particularly serious for large diameter butterfly valve. SUMMARY

[0004] In order to solve the above problems, the utility model provides a kind of tail end structure of butterfly valve, the bottom of the valve body of butterfly valve is provided with end cover, the bottom of the valve body is vertically provided with first through hole, the bottom end of the first through hole is stepped hole structure, the lower valve shaft of the butterfly valve is inserted into the first through hole, the end cover is arranged below the through hole, the bottom end of the lower valve shaft is provided with circular groove, and the tail end structure comprises:

[0005] Screw rod is vertically inserted into the end cover, the top end of the screw rod is provided with cylindrical structure with a diameter larger than the screw rod, the cylindrical structure is clamped in the end cover, the cylindrical structure is used to move up and down relative to the end cover, the bottom end of the lower valve shaft is arranged at a distance from the cylindrical structure, and the bottom end of the screw rod extends out of the bottom surface of the end cover and is matched with the corresponding nut by thread;

[0006] Friction pad is clamped between the lower valve shaft and the cylindrical structure; and

[0007] Split ring is sleeved in the circular groove and clamped in the circular ring eaves of the stepped hole structure;

[0008] Wherein, the upper ring surface of the circular groove and the top surface of the split ring are arranged at a first set distance, the bottom end of the lower valve shaft and the top surface of the cylindrical structure are arranged at a second set distance, and the second set distance is smaller than the first set distance.

[0009] Further, the bottom end of the lower valve shaft is provided with a first recess structure recessed upward, the friction pad is arranged in the first recess structure, and the bottom surface of the friction pad protrudes from the bottom end of the lower valve shaft.

[0010] Further, the top surface of the end cover is provided with a second recess structure, the second recess structure is concave downward, the second recess structure is below the lower valve shaft, the cylindrical structure is placed in the second recess structure,

[0011] The cylindrical structure is provided with a sealing groove, and a sealing ring is sleeved in the sealing groove, and the sealing ring is used for sealing the gap between the cylindrical structure and the second recess structure.

[0012] Further, the distance between the bottom surface of the cylindrical structure and the bottom surface of the second recess structure is a fourth set distance,

[0013] The first set distance is greater than the fourth set distance.

[0014] Further, the vertical depth of the first recess structure is a third set distance, and the third set distance is greater than the fourth set distance.

[0015] Further, the side wall of the second recess structure is provided with a corrosion-resistant coating, and the sealing ring is in contact with the corrosion-resistant coating.

[0016] Further, the friction pad is a bronze friction pad.

[0017] Further, the end cover is provided with a convex stop, the split ring is matched with the convex stop, and the convex stop is used for positioning the split ring.

[0018] Further, the nut is provided with a retreat stop washer, the retreat stop washer is in contact with the end cover, and the retreat stop washer is used for preventing the nut from loosening.

[0019] In addition, the utility model also provides a vertical installation butterfly valve, including the tail end structure.

[0020] The above technical scheme of the utility model has the following beneficial technical effects:

[0021] The friction pad is clamped between the lower valve shaft and the cylindrical structure, so that friction is generated between the cylindrical structure and the friction pad, the large end is prevented from rotating relative to the friction pad, the screw rod is prevented from rotating with the nut during the rotation of the nut, the screw rod is lifted by rotating the nut, the screw rod is connected with the nut, the required wear compensation amount of the stepless adjustment of the friction pad is realized, the fine adjustment of the wear compensation is realized. And only one screw rod can realize the adjustment of the friction pad, so that the radial contact of the butterfly plate sealing ring and the valve seat is uniform, and the operation is simple and convenient.

[0022] The upper ring surface of the circular groove is at a first set distance from the top surface of the split ring, and the bottom end of the lower valve shaft is at a second set distance (maximum wear) from the cylindrical structure, which is smaller than the first set distance. The split ring does not bear the weight of the rotating assembly. If the second set distance is greater than the first set distance, the split ring will wear and begin to bear the support function, and if the split ring is replaced, the valve needs to be disassembled, which is a major repair, and if the split ring is used in reverse, the limit will be affected, resulting in high maintenance costs. Therefore, the second set distance is smaller than the first set distance, which can also reduce maintenance costs.

[0023] The split ring does not bear the weight of the rotating assembly of the butterfly plate, and only serves as a limiting function in the upward direction. Thus, wear of the split ring is prevented.

[0024] In addition, the friction pad limits the downward displacement of the rotating assembly of the butterfly plate of the butterfly valve and supports the weight of the rotating assembly of the butterfly plate, thereby reducing wear.

[0025] In addition, the diameter of the cylindrical structure is greater than the diameter of the friction pad and the screw rod, preventing the screw rod and the friction pad from falling off.

[0026] The screw rod is prevented from loosening by the nut and the stop washer, allowing online, stepless, and real-time adjustment.

[0027] In addition, the side wall of the second recessed structure is provided with a corrosion-resistant coating to protect the sealing surface from corrosion. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 is a schematic side view of the tail end structure of the butterfly valve according to the embodiment of the present application;

[0029] Figure 2 is Figure 1 is a schematic enlarged view of point P in FIG. 6;

[0030] Figure 3 is Figure 1 is another schematic enlarged view of point P in FIG. 6.

[0031] FIG. 1 is a schematic side view of the tail end structure of the butterfly valve according to the embodiment of the present application; FIG. 2 is a schematic enlarged view of point P in FIG. 1; FIG. 3 is a schematic enlarged view of point P in FIG. 1; FIG. 4 is a schematic enlarged view of point P in FIG. 1; FIG. 5 is a schematic enlarged view of point P in FIG. 1; FIG. 6 is a schematic enlarged view of point P in FIG. 1; FIG. 7 is another schematic enlarged view of point P in FIG. 1; 1, end cap; 11, second recessed structure; 12, second through hole; 2, lower valve shaft; 21, first recessed structure; 22, sleeve; 23, circular groove; 3, screw rod; 31, cylindrical structure; 32, sealing groove; 4, friction pad; 5, nut; 6, stop washer; 7, split ring; 8, valve body; 81, first through hole; 82, stepped hole structure; d1, first set distance; d2, second set distance; d3, third set distance; d4, fourth set distance. DETAILED DESCRIPTION

[0032] To make the purpose, technical scheme and advantages of the present application more clear, specific embodiments will be described below in conjunction with the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present application. In addition, in the following description, the description of known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present application.

[0033] The layer structure schematic diagrams according to the embodiments of the present application are shown in the accompanying drawings. These drawings are not drawn to scale, in which some details are exaggerated for the purpose of clarity and some details can be omitted. The shapes of various regions, layers and their relative sizes and positions shown in the drawings are only exemplary, and in practice, they can be deviated due to manufacturing tolerances or technical limitations, and regions / layers with different shapes, sizes and relative positions can be additionally designed by those skilled in the art according to actual needs.

[0034] Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0035] In addition, the technical features involved in different embodiments of the present application described below can be combined with each other as long as there is no conflict.

[0036] The present application will be described in more detail below with reference to the accompanying drawings. In each of the drawings, similar elements are denoted by similar reference numerals. Each part in the drawings is not drawn to scale for the purpose of clarity.

[0037] For the existing components not involving the improvement points of the present application, they will be simply introduced or not introduced, and the constituent components improved relative to the prior art will be mainly introduced.

[0038] Referring to Figures 1 to 3 , the present embodiment provides a tail end structure of a butterfly valve, an end cover 1 is arranged at the bottom of a valve body 8 of the butterfly valve, a first through hole 81 is vertically arranged at the bottom of the valve body 8, the bottom end of the first through hole 81 is a stepped hole structure 82, a lower valve shaft 2 of the butterfly valve is inserted into the first through hole 81, the end cover 1 is arranged below the through hole, a circular ring groove 23 is arranged at the bottom end of the lower valve shaft 2, and the tail end structure comprises:

[0039] A screw rod 3 is vertically inserted into the end cover 1, the top end of the screw rod 3 is provided with a cylindrical structure 31 with a larger diameter than the screw rod 3, the cylindrical structure 31 is clamped in the end cover 1, the cylindrical structure 31 is used to move up and down relative to the end cover 1, the bottom end of the lower valve shaft 2 is arranged at a distance from the cylindrical structure 31, the bottom end of the screw rod 3 extends out of the bottom surface of the end cover 1 and is threadedly connected with a corresponding nut 5;

[0040] A friction pad 4 is clamped between the lower valve shaft 2 and the cylindrical structure 31; and

[0041] A split ring 7 is sleeved in the circular ring groove 23 and clamped at the circular ring eaves inside the stepped hole structure 82;

[0042] Wherein, the upper ring surface of the circular ring groove 23 and the top surface of the split ring 7 are at a first set distance d1, the bottom end of the lower valve shaft 2 and the top surface of the cylindrical structure 31 are at a second set distance d2, the second set distance d2 is smaller than the first set distance d1.

[0043] It should be noted that although the cylindrical structure 31 can cause the screw rod 3 to be easily rotated, the use of the friction pad 4 clamped between the lower valve shaft 2 and the cylindrical structure 31 causes friction between the cylindrical structure 31 and the friction pad 4, preventing the cylindrical structure 31 from rotating relative to the friction pad, so that the screw rod 3 does not rotate with the nut 5 during the rotation of the nut 5. Therefore, by rotating the nut 5 to raise and lower the screw rod 3, the required wear compensation amount can be adjusted steplessly.

[0044] Further, the bottom end of the lower valve shaft 2 is provided with a first recess structure 21 recessed upward, the friction pad 4 is placed in the first recess structure 21, and the bottom surface of the friction pad 4 protrudes from the bottom end of the lower valve shaft 2. The first recess structure 21 here can be a groove structure.

[0045] Further, the bottom end of the lower valve shaft 2 is sleeved with a sleeve 22, and the split ring 7 is placed between the sleeve 22 and the end cover 1.

[0046] Further, the top surface of the end cover 1 is provided with a second recess structure 11 recessed downward, the second recess structure 11 is located below the lower valve shaft 2, and the cylindrical structure 31 of the screw rod 3 is placed in the second recess structure 11,

[0047] The cylindrical structure 31 is provided with a sealing groove 32, and a sealing ring 33 is sleeved in the sealing groove 32, and the sealing ring 33 is used to seal the gap between the cylindrical structure 31 and the second recess structure 11.

[0048] The bottom surface of the second recess structure 11 is provided with a second through hole 12, and the screw rod 3 is inserted into the second through hole 12.

[0049] Further, the distance between the bottom surface of the cylindrical structure 31 and the bottom surface of the second recess structure 11 is a fourth set distance d4,

[0050] The first set distance d1 is greater than the fourth set distance d4. It is ensured that the friction pad 4 is always in the first recess structure 21 of the lower valve shaft 2.

[0051] The second recess structure 11 here can be a blind hole structure that is recessed downward.

[0052] Further, the vertical depth of the first recess structure 21 is a third set distance d3, and the third set distance d3 is greater than the fourth set distance d4,

[0053] If the third set distance d3 is less than the fourth set distance d4, the friction pad 4 can be separated from the first recess structure 21 at the lower end of the lower valve shaft 2, and more seriously, the friction pad 4 can be clamped between the lower end surface of the lower valve shaft 2 and the upper end surface of the screw rod 3, or enter the gap between the lower valve shaft 2 and the end cover 1.

[0054] Further, the side wall of the second recess structure 11 is provided with a corrosion-resistant coating, and the sealing ring 33 is in contact with the corrosion-resistant coating. The corrosion-resistant coating is a copper alloy cladding layer.

[0055] Further, the friction pad 4 is a bronze friction pad 4.

[0056] Further, the end cover is provided with a convex stop, the split ring is matched with the convex stop, and the convex stop is used for positioning the split ring.

[0057] Further, the nut 5 is provided with a retreat stop washer 6, the retreat stop washer 6 is in contact with the end cover 1, and the retreat stop washer 6 is used for preventing the nut 5 from loosening.

[0058] The screw rod 3 can realize the stepless adjustment of the wear compensation amount required for the friction pad 4, and realize the fine adjustment of the wear compensation. Moreover, only one screw rod 3 can realize the adjustment of the friction pad 4, and the operation is simple and convenient.

[0059] The upper ring surface of the circular groove 23 is at a first set distance d1 from the top surface of the split ring 7, and the bottom end of the lower valve shaft 2 is at a second set distance d2 (maximum wear) from the cylindrical structure 31, which is smaller than the first set distance d1. The split ring 7 is not subjected to the gravity of the rotating assembly. If the second set distance is greater than the first set distance, wear occurs between the friction pad 4 and the lower valve shaft 2 or the end cover 1, and the support function begins, and if the split ring 7 is replaced, the valve needs to be disassembled, which is a major repair, and if the split ring 7 is used in reverse, it affects the limit and causes high maintenance costs. Therefore, the second set distance d2 is smaller than the first set distance d1, which can also reduce maintenance costs.

[0060] The split ring 7 is not subjected to the gravity of the butterfly plate rotating assembly, and only functions as a limit in the upward direction. Thus, wear of the split ring 7 is prevented.

[0061] In addition, the friction pad 4 limits the downward displacement of the butterfly plate rotating assembly of the butterfly valve and supports the gravity of the butterfly plate rotating assembly, thereby reducing wear.

[0062] In addition, the cylindrical structure 31, which has a diameter greater than the thread diameter of the friction pad 4 and the screw rod 3, prevents the screw rod 3 and the friction pad 4 from falling off.

[0063] The screw rod 3 is prevented from loosening by the nut 5 and the stop washer, allowing online, stepless, and real-time adjustment.

[0064] In addition, the side wall of the second recessed structure 11 is provided with a corrosion-resistant coating to protect the sealing surface from corrosion.

[0065] In addition, the embodiment also provides a vertical installation butterfly valve comprising the tail end structure. Since the vertical installation butterfly valve achieves the same technical effects as the tail end structure, the vertical installation butterfly valve will not be explained and described again.

[0066] It should be understood that the above specific embodiments of the present application are only used for illustrative or explanatory purposes of the principles of the present application, and do not constitute a limitation on the present application. Therefore, any modification, equivalent replacement, improvement, etc. made without departing from the spirit and scope of the present application shall be included within the protection scope of the present application. In addition, the appended claims of the present application are intended to cover all changes and modifications falling within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A butterfly valve tail end structure, characterized by, The bottom of the valve body (8) of the butterfly valve is provided with an end cover (1), the bottom of the valve body (8) is vertically provided with a first through hole (81), the bottom end of the first through hole (81) is a stepped hole structure (82), the lower valve shaft (2) of the butterfly valve is inserted into the first through hole (81), the end cover (1) is arranged below the through hole, the bottom end of the lower valve shaft (2) is provided with a circular groove (23), and the tail end structure comprises: A screw rod (3) is vertically inserted into the end cover (1), the top end of the screw rod (3) is provided with a cylindrical structure (31) with a diameter larger than that of the screw rod (3), the cylindrical structure (31) is clamped in the end cover (1), the cylindrical structure (31) is used for moving up and down relative to the end cover (1), the bottom end of the lower valve shaft (2) is arranged at a distance from the cylindrical structure (31), and the bottom end of the screw rod (3) protrudes from the bottom surface of the end cover (1) and is threadedly connected with a corresponding nut (5); A friction pad (4) is clamped between the lower valve shaft (2) and the cylindrical structure (31); and A split ring (7) is sleeved in the circular groove (23) and clamped at the circular ring eaves in the stepped hole structure (82); Wherein, the upper ring surface of the circular groove (23) and the top surface of the split ring (7) are at a first set distance (d1), the bottom end of the lower valve shaft (2) and the top surface of the cylindrical structure (31) are at a second set distance (d2), and the second set distance (d2) is smaller than the first set distance (d1).

2. The tail end structure according to claim 1, characterized by The bottom end of the lower valve shaft (2) is provided with a first recess structure (21) recessed upward, the friction pad (4) is arranged in the first recess structure (21), and the bottom surface of the friction pad (4) protrudes from the bottom end of the lower valve shaft (2).

3. The tail end structure according to claim 2, characterized in that The top surface of the end cover (1) is provided with a second recess structure (11) recessed downward, the second recess structure (11) is located below the lower valve shaft (2), and the cylindrical structure (31) is arranged in the second recess structure (11), The cylindrical structure (31) is provided with a sealing groove (32), a sealing ring is sleeved in the sealing groove (32), and the sealing ring is used for sealing the gap between the cylindrical structure (31) and the second recess structure (11).

4. The tail end structure according to claim 3, characterized by The distance between the bottom surface of the cylindrical structure (31) and the bottom surface of the second recess structure (11) is a fourth set distance (d4), The first set distance (d1) is greater than the fourth set distance (d4).

5. The tail end structure of claim 4, wherein The vertical depth of the first recess structure (21) is a third set distance (d3), and the third set distance (d3) is greater than the fourth set distance (d4).

6. The tail end structure of claim 3, wherein The side wall of the second recess structure (11) is provided with a corrosion-resistant coating, and the sealing ring is in contact with the corrosion-resistant coating.

7. The tail end structure according to any one of claims 1 to 6, wherein The friction pad (4) is a bronze friction pad (4).

8. The tail end structure according to any one of claims 1 to 6, wherein The end cover (1) is provided with a convex stop opening, the split ring (7) is matched with the convex stop opening, and the convex stop opening is used for positioning the split ring (7).

9. The tail end structure according to any one of claims 1 to 6, wherein The nut (5) is provided with a retreat-stop washer (6), which is in contact with the end cover (1) and is used for preventing the nut (5) from loosening.

10. A butterfly valve for vertical installation, characterized in that The tail end structure according to any one of claims 1 to 9.

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