Valve rod lengthening structure of lifting rod valve

Abstract

The utility model discloses a lifting rod valve rod lengthening structure, which belongs to the technical field of lifting rod valves, and comprises a valve body, the upper end of the valve body is connected with a lengthening valve rod through a connecting device, and the upper end of the lengthening valve rod is provided with a driving device. By means of the mode, the driving device drives the connecting device to drive the valve body to rotate so as to control opening and closing of the valve, friction between movable parts can be reduced through the connecting device, the operation torque of a product is reduced, all parts are mechanically combined, transmission efficiency is high, and combination stability is reliable; deflection deformation possibly caused by a slender rod structure in the large torque transmission process is fully considered, a fixing and supporting structure is designed, and stable operation is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of lift rod valves, in particular to a lift rod valve stem lengthening structure. Background Art

[0002] Lifting stem valves are generally understood to be valves such as globe valves and gate valves whose stems move up and down during opening and closing. For certain special operating conditions, such as when gate valves and globe valves are installed in a valve well, the valve's operating interface (usually the handwheel) needs to be extended to a certain height to meet the design requirements of the operating position.

[0003] Chinese patent CN210661612U discloses a valve extension rod structure, which includes a valve body, a valve stem, a connecting rod, a connecting piece, a fixed bearing, and a rotating handwheel; the valve stem is arranged on the valve body for rotating the valve body; the valve stem and the connecting rod and different connecting rods are connected by the connecting piece; the connecting rod passes through the fixed bearing, and the fixed bearing is fixed to the pipe wall or the underground well wall by a fixing component; the top of the connecting rod extends out of the ground, and the rotating handwheel is installed on the top of the connecting rod for manual rotation operation. The improved extension rod according to the utility model can fully realize the above-ground operation of the underground valve, and the valve opening and closing operations can be completed on the ground, avoiding underground operations and improving work efficiency. However, this structure still has the following problems:

[0004] The valve stem is a slender rod structure. When it is subjected to the torque input by the handwheel, it will produce a certain degree of deflection and deformation due to the lack of reliable support. At the very least, it will affect the valve operation accuracy. At worst, it will affect the valve packing seal and shorten the valve service life.

[0005] Based on this, the utility model designs a valve stem lengthening structure of a lifting stem valve to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the utility model provides a valve stem lengthening structure for a lifting stem valve.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A valve stem extension structure for a lifting stem valve, comprising a valve body,

[0009] The upper end of the valve body is connected to an extended valve stem through a connecting device, and the upper end of the extended valve stem is provided with a driving device;

[0010] The connecting device includes an adapter plate, a three-claw valve stem nut, a thrust ball bearing, a bearing cover, an extended bracket, a bolt, a nut and a sliding bearing. The upper end of the valve body is fixedly connected to the adapter plate, the upper end of the adapter plate is provided with a groove and the upper end of the groove is provided with an internal thread, and a three-claw valve stem nut is provided in the groove at the upper end of the adapter plate. Thrust ball bearings are provided at the upper and lower ends of the three-claw valve stem nut, and the adapter plate is threadedly connected to the bearing cover through the internal thread at the upper end of the groove; the upper end of the adapter plate is provided with a positioning sub-port and is connected to the extended bracket through a flange, and the fastening between the adapter plate and the extended bracket is achieved by the cooperation of bolts and nuts; the inner side of the lower end of the extended bracket is provided with a groove and is fixedly connected to the sliding bearing; the lower end of the short tube at the bottom of the extended valve stem is provided with a three-claw structure; the short tube at the bottom of the extended valve stem and the extended steel pipe are provided with mutually cooperating positioning sub-ports and are firmly welded by fillet welds; the three-claw valve stem nut is connected to the extended valve stem through the three-claw structure.

[0011] Furthermore, the upper end of the valve body is provided with a convex positioning sub-port, and the lower end of the adapter plate is provided with a concave positioning sub-port corresponding to the convex positioning sub-port. The concave positioning sub-port and the convex positioning sub-port are aligned and welded to fix the valve body and the adapter plate.

[0012] Furthermore, the extended valve stem adopts a multi-section welding structure.

[0013] Furthermore, the extended bracket adopts a multi-section split structure, and the sections of the extended bracket are connected by flanges and fastened with bolts and nuts. Support sleeves are embedded in the connecting flanges of each section.

[0014] Furthermore, the support sleeve positions the segmented flange and supports the extended valve stem.

[0015] Furthermore, an appropriate gap is left between the support sleeve and the extended valve stem.

[0016] Furthermore, the driving device includes a valve stem nut, a gland nut, a handwheel and a locking nut, and the extended valve stem is threadedly connected to the gland nut; the valve stem nut is threadedly connected to the upper end of the extended valve stem; the valve stem nut and the handwheel are plugged into a rectangular, hexagonal or round hole keyway, and when the valve stem nut and the handwheel are connected through the round hole keyway, the handwheel is plugged into the valve stem nut through a flat key; the valve stem nut and the locking nut are threadedly connected, and the valve stem nut and the locking nut cooperate to fix the handwheel.

[0017] Furthermore, a gap is provided between the lower end of the gland nut and the shoulder of the extended valve stem.

[0018] Compared with the existing technology, the beneficial effects of the utility model are as follows: the three-claw valve stem nut is equipped with a thrust ball bearing, which reduces the friction between the moving parts and reduces the operating torque of the product. The various components are mechanically connected, with high transmission efficiency and reliable connection stability. The deflection deformation that may be caused by the slender rod structure during the transmission of large torque is fully considered, and a fixing and supporting structure is designed to ensure stable operation. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0020] Figure 1 This is a front view of a valve stem extension structure of a lifting stem valve of the utility model Figure 1 ;

[0021] Figure 2 This is a front view of a valve stem extension structure of a lifting stem valve of the utility model Figure 2 ;

[0022] Figure 3 for Figure 1 Enlarged view of point A in the middle;

[0023] Figure 4 for Figure 1 Enlarged view of point B in the middle;

[0024] Figure 5 This is a schematic diagram of the three-claw structure of the utility model.

[0025] The numbers in the figure represent:

[0026] 1. Valve body; 2. Adapter plate; 3. Three-claw stem nut; 4. Thrust ball bearing; 5. Bearing gland; 6. Extension bracket; 7. Bolt; 8. Nut; 9. Sliding bearing; 10. Extension stem; 11. Support sleeve; 12. Stem nut; 13. Gland nut; 14. Flat key; 15. Handwheel; 16. Lock nut. DETAILED DESCRIPTION

[0027] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0028] The terms “left,” “right,” “front,” “back,” “up,” and “down” mentioned in the following description are oriented in the viewing direction of the front view.

[0029] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figure 1-Figure 5 A valve stem extension structure for a lifting stem valve, comprising a valve body 1,

[0030] The upper end of the valve body 1 is connected to an extended valve stem 10 through a connecting device, and the upper end of the extended valve stem 10 is provided with a driving device;

[0031] The connecting device includes an adapter plate 2, a three-claw valve stem nut 3, a thrust ball bearing 4, a bearing cover 5, an extended bracket 6, a bolt 7, a nut 8 and a sliding bearing 9. The upper end of the valve body 1 is fixedly connected to the adapter plate 2, and the upper end of the valve body 1 is provided with a convex positioning sub-port, and the lower end of the adapter plate 2 is provided with a concave positioning sub-port corresponding to the convex positioning sub-port. The concave positioning sub-port and the convex positioning sub-port are aligned and welded, so that the valve body 1 and the adapter plate 2 are fixedly connected; the upper end of the adapter plate 2 is provided with a groove and the upper end of the groove is provided with an internal thread, the three-claw valve stem nut 3 is provided in the groove at the upper end of the adapter plate 2, and the upper and lower ends of the three-claw valve stem nut 3 are provided with thrust The adapter plate 2 is threadedly connected to the bearing cover 5 through the internal thread at the upper end of the groove; the upper end of the adapter plate 2 is provided with a positioning sub-mouth and is connected to the extended bracket 6 through a flange, and the fastening between the adapter plate 2 and the extended bracket 6 is achieved by the cooperation of bolts 7 and nuts 8; the inner side of the lower end of the extended bracket 6 is provided with a groove and is fixedly connected to a sliding bearing 9; the extended valve stem 10 adopts a multi-section welding structure, which is convenient for production and processing, and the lower end of the short tube at the bottom of the extended valve stem 10 is provided with a three-claw structure; the short tube at the bottom of the extended valve stem 10 and the extended steel pipe are provided with mutually cooperating positioning sub-mouths, and are firmly welded by fillet welds; the three-claw valve stem nut 3 is connected to the extended valve stem 10 through the three-claw structure.

[0032] In the utility model, the extended valve stem 10 is driven to rotate by the driving device, and the extended valve stem 10 drives the three-claw valve stem nut 3 to rotate under the limiting action of the thrust ball bearing 4 and the bearing cover 5 through the three-claw structure. The three-claw valve stem nut 3 drives the adapter plate 2 to drive the valve body 1 to rotate, thereby controlling the opening and closing of the valve body 1.

[0033] In the utility model, the three-claw valve stem nut 3 is equipped with a thrust ball bearing 4, which reduces the friction between the moving parts and reduces the operating torque of the product. The various components are mechanically connected, with high transmission efficiency and reliable connection stability. The deflection deformation that may be caused by the slender rod structure during the transmission of large torque is fully considered, and a fixing and supporting structure is designed to ensure stable operation.

[0034] The extension bracket 6 can be designed as a multi-section split structure or an integrated structure according to the length deflection check result of the extension valve stem 10; when the extension bracket 6 adopts a multi-section split structure, such as Figure 2 As shown, each segment is connected by a flange and fastened with bolts 7 and nuts 8. A support sleeve 11 is embedded in the connecting flange of each segment. The support sleeve 11 positions the segment flange and supports the extended valve stem 10. An appropriate gap is left between the support sleeve 11 and the extended valve stem 10.

[0035] The driving device includes a valve stem nut 12, a gland nut 13, a handwheel 15 and a locking nut 16, and the extended valve stem 10 is threadedly connected to the gland nut 13; a gap is provided at the lower end of the gland nut 13 and the shoulder of the extended valve stem 10; the valve stem nut 12 is threadedly connected to the upper end of the extended valve stem 10; the valve stem nut 12 and the handwheel 15 are plugged into a rectangular, hexagonal or round hole keyway, and when the valve stem nut 12 and the handwheel 15 are connected through the round hole keyway, the handwheel 15 is plugged into the valve stem nut 12 through the flat key 14; the valve stem nut 12 and the locking nut 16 are threadedly connected, and the valve stem nut 12 and the locking nut 16 cooperate to fix the handwheel 15.

[0036] In the present utility model, the handwheel 15 drives the valve stem nut 12 to rotate under the limiting action of the locking nut 16, thereby driving the valve body 1 to rotate and controlling the opening and closing of the valve body 1; a gap is provided between the lower end of the gland nut 13 and the shoulder of the extended valve stem 10 to avoid locking between metal parts due to thermal expansion and contraction; the extended bracket 6 can be designed as a multi-section split structure or an integrated structure according to the length deflection verification result of the extended valve stem 10, which fully considers the deflection deformation that may be caused by the slender rod structure during the transmission of large torque, thereby ensuring stable operation.

[0037] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A valve stem extension structure for a lifting stem valve, comprising a valve body (1), characterized in that: The upper end of the valve body (1) is connected to an extended valve stem (10) via a connecting device, and the upper end of the extended valve stem (10) is provided with a driving device; The connecting device comprises an adapter plate (2), a three-claw valve stem nut (3), a thrust ball bearing (4), a bearing cover (5), an extended bracket (6), a bolt (7), a nut (8) and a sliding bearing (9); the upper end of the valve body (1) is fixedly connected with the adapter plate (2); the upper end of the adapter plate (2) is provided with a groove and the upper end of the groove is provided with an internal thread; the three-claw valve stem nut (3) is provided in the groove at the upper end of the adapter plate (2); the upper and lower ends of the three-claw valve stem nut (3) are provided with thrust ball bearings (4); the adapter plate (2) is screwed to the bearing cover (5) through the internal thread at the upper end of the groove The adapter plate (2) is connected with the extension bracket (6) by means of a thread; the upper end of the adapter plate (2) is provided with a positioning sub-mouth and is connected to the extension bracket (6) through a flange, and the adapter plate (2) and the extension bracket (6) are fastened together by means of a bolt (7) and a nut (8); the inner side of the lower end of the extension bracket (6) is provided with a groove and is fixedly connected to a sliding bearing (9); the lower end of the short tube at the bottom of the extension valve stem (10) is provided with a three-claw structure; the short tube at the bottom of the extension valve stem (10) and the extension steel pipe are provided with mutually matching positioning sub-mouths and are firmly welded by a fillet weld; the three-claw valve stem nut (3) is connected to the extension valve stem (10) through the three-claw structure.

2. The valve stem extension structure of the lifting stem valve according to claim 1, characterized in that: The upper end of the valve body (1) is provided with a convex positioning sub-portion, and the lower end of the adapter plate (2) is provided with a concave positioning sub-portion corresponding to the convex positioning sub-portion. The concave positioning sub-portion and the convex positioning sub-portion are aligned and matched and welded, so that the valve body (1) and the adapter plate (2) are fixedly connected.

3. The valve stem extension structure of the lifting stem valve according to claim 2, characterized in that: The extended valve stem (10) adopts a multi-section welding structure.

4. The valve stem extension structure for a lifting stem valve according to claim 3, characterized in that: The extended bracket (6) adopts a multi-section split structure, and each section of the extended bracket (6) is connected by flanges and fastened with bolts (7) and nuts (8), and a supporting sleeve (11) is embedded in the flange of each section.

5. The valve stem extension structure for a lifting stem valve according to claim 4, characterized in that: The supporting sleeve (11) positions the segmented flange and supports the extended valve stem (10).

6. The valve stem extension structure for a lifting stem valve according to claim 5, characterized in that: An appropriate gap is left between the supporting sleeve (11) and the extended valve stem (10).

7. The valve stem extension structure for a lifting stem valve according to claim 6, characterized in that: The driving device comprises a valve stem nut (12), a gland nut (13), a hand wheel (15) and a locking nut (16); the extended valve stem (10) is threadedly connected to the gland nut (13); the valve stem nut (12) is threadedly connected to the upper end of the extended valve stem (10); the valve stem nut (12) and the hand wheel (15) are plugged into each other through a rectangular, hexagonal or circular keyway; when the valve stem nut (12) and the hand wheel (15) are connected through the circular keyway, the hand wheel (15) is plugged into the valve stem nut (12) through a flat key (14); the valve stem nut (12) and the locking nut (16) are threadedly connected, and the valve stem nut (12) and the locking nut (16) cooperate to fix the hand wheel (15).

8. The valve stem extension structure for a lifting stem valve according to claim 7, characterized in that: A gap is provided between the lower end of the gland nut (13) and the shoulder of the extended valve stem (10).

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