Anti-rotation device for valve rod of stop valve

Abstract

The utility model discloses an anti-rotation device for a valve rod of a stop valve, which belongs to the technical field of valve equipment and comprises a first anti-rotation block and a second anti-rotation block, the first anti-rotation block is positioned on the front side of the second anti-rotation block, grooves are formed in the middle of the first anti-rotation block and the middle of the second anti-rotation block, a valve rod is arranged in the middle of the two grooves, and the valve rod is connected with the first anti-rotation block and the second anti-rotation block. And plane grooves are formed in the front side and the rear side of the middle of the valve rod correspondingly, the two plane grooves make contact with the two grooves in an attached mode, and supporting rods are symmetrically arranged on the left side and the right side of the first anti-rotation block and the left side and the right side of the second anti-rotation block. By means of the mode, when the valve rod fixing device is used, the valve rod can be effectively fixed in the radial direction, and the valve rod can only move in the axial direction; and meanwhile, the device can adapt to stop valves of various structures and can be quickly maintained, maintained and adjusted on a construction site.

Description

Technical Field

[0001] The utility model relates to the technical field of valve equipment, in particular to an anti-rotation device for the stem of a globe valve. Background Technique

[0002] The anti-rotation structure of the stem of a globe valve is generally used for a globe valve with a driver. The existing anti-rotation structure of a globe valve usually mills a flat surface on the stem and then drills a threaded hole, and then fixes a steel plate on the stem by fastening it with a hexagon head bolt. When the stem deflects under the driving force, the distal end of the steel plate abuts against the support column, playing a role in preventing the stem from rotating.

[0003] For example, Chinese Patent CN208519202U discloses an anti-rotation structure for the stem of a globe valve. A guiding rib is provided on the bracket of the globe valve, and a guiding groove is provided on the guiding rib along the axial direction of the stem. A through hole perpendicular to the axial direction of the stem is provided on the stem. An anti-rotation pin is passed through the through hole on the stem and one end of it is located in the guiding groove. The end of the anti-rotation pin located in the guiding groove can slide freely up and down in the guiding groove.

[0004] However, its technology has the following problems. Drilling holes in the stem will damage the mechanical structure of the drilled section of the stem, affecting its stability and structural strength. When the stem has a tendency to rotate, only one-sided limit of a single anti-rotation pin plays a role, and it needs to bear all the torsional stress, with a large local load, affecting the anti-rotation effect.

[0005] Based on this, the utility model designs an anti-rotation device for the stem of a globe valve to solve the above problems. Content of the Utility Model

[0006] Aiming at the above-mentioned disadvantages of the prior art, the utility model provides an anti-rotation device for the stem of a globe valve.

[0007] To achieve the above object, the utility model is realized through the following technical solutions:

[0008] An anti-rotation device for the stem of a globe valve includes a first anti-rotation block and a second anti-rotation block. The first anti-rotation block is located in front of the second anti-rotation block. Grooves are provided in the middle of both the first anti-rotation block and the second anti-rotation block. A stem is provided in the middle of the two grooves. Plane grooves are provided on both the front and rear sides of the middle of the stem. The two plane grooves are in close contact with the two grooves. Support rods are symmetrically arranged on the left and right sides of the first anti-rotation block and the second anti-rotation block;

[0009] A second through hole is formed inside the first anti-rotation block, and a first through hole is formed inside the second anti-rotation block. The first through hole and the second through hole are located on the same center line. Both the first through hole and the second through hole are in sliding fit connection with the moving rod. The rear side of the first through hole is fixedly connected to one end of a spring, and the other end of the spring is fixedly connected to the rear side of the moving rod. A knob is fixedly installed at the front end of the moving rod;

[0010] The first anti-rotation block is provided with an L-shaped groove and a clamping groove at the position of the second through hole. The rear end of the L-shaped groove communicates with the clamping groove;

[0011] A sliding column is fixedly installed on the side wall of the moving rod. The sliding column is in sliding fit connection with the L-shaped groove and is clamped with the clamping groove.

[0012] Furthermore, the planar grooves on the front and rear sides are arranged in parallel and symmetrically.

[0013] Furthermore, the rear end of the first anti-rotation block does not fit with the front end of the second anti-rotation block, leaving an assembly gap.

[0014] Furthermore, the first through hole, the second through hole, the spring, the moving rod, the knob, the L-shaped groove, the sliding column, and the clamping groove are provided in multiple groups and are symmetrically arranged at the left and right ends of the valve stem respectively.

[0015] Furthermore, inclined surfaces are symmetrically formed on the left and right sides of the first anti-rotation block and the second anti-rotation block.

[0016] Furthermore, the inclined surfaces on the left and right sides of the first anti-rotation block and the second anti-rotation block are respectively in sliding fit connection with the side walls of two support rods.

[0017] Furthermore, the distance between the upper and lower ends of the first anti-rotation block and the second anti-rotation block is less than the distance between the upper and lower ends of the planar groove.

[0018] Furthermore, the lower ends of the first anti-rotation block and the second anti-rotation block are located on the same horizontal line as the lower end of the planar groove.

[0019] Compared with the prior art, the beneficial effects of the present utility model are as follows: 1. Planar grooves processed on both sides of the valve stem are parallel and symmetric, which is more conducive to bearing the torque received by the valve stem, and the valve stem is not drilled, so the strength and structural stability of the valve stem are better;

[0020] 2. When the first anti-rotation block and the second anti-rotation block bear the driving torque, the moving rods are arranged on both sides, making the force arms shorter and generating smaller stresses, ensuring the safety of the structure; the first anti-rotation block and the second anti-rotation block adopt a dual-plate structure with opposite installation. When the valve stem is rotated in any direction, two limit positions act simultaneously, decomposing the bearing capacity on one side and avoiding the unbalanced force caused by excessive local load;

[0021] 3. When the valve stem needs to be fixed, push the knob inward by hand. The knob drives the moving rod to move, and the moving rod drives the sliding column to slide in the L-shaped groove. When the sliding column contacts the rear side of the L-shaped groove and cannot be pushed further, then rotate the knob. The moving rod rotates accordingly, and the moving rod drives the sliding column to slide on the rear side of the L-shaped groove until the sliding column moves to the clamping groove. Under the action of the spring, the sliding column is clamped and locked with the clamping groove, thereby locking the moving rod. The first anti-rotation block and the second anti-rotation block radially fix the valve stem, enabling the valve stem to only move axially;

[0022] When this utility model is in use, it can effectively radially fix the valve stem, enabling the valve stem to only move axially; at the same time, this device can adapt to globe valves of various structures and can be quickly maintained, repaired, and adjusted at the construction site. Brief Description of the Drawings

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0024] Figure 1 Is a perspective view of an anti-rotation device for the valve stem of a globe valve of the present utility model;

[0025] Figure 2 Is a front view of an anti-rotation device for the valve stem of a globe valve of the present utility model;

[0026] Figure 3 Is a cross-sectional view along the Figure 2 A-A direction;

[0027] Figure 4 Is a schematic diagram of the valve stem of the present utility model;

[0028] Figure 5 Is a schematic diagram of the moving rod of the present utility model;

[0029] Figure 6 Is a perspective view of the present utility model.

[0030] The reference numerals in the drawings respectively represent:

[0031] 1. First anti-rotation block; 2. Second anti-rotation block; 3. Support rod; 4. First through hole; 5. Second through hole; 6. Spring; 7. Moving rod; 8. Knob; 9. L-shaped groove; 10. Sliding column; 11. Valve stem; 12. Flat groove; 13. Clamping groove; 14. Groove. Detailed Embodiment

[0032] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present utility model. Obviously, the described embodiments are some, but not all, of the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0033] In the following description, "left", "right", "front", "rear", "upper", and "lower" mentioned are oriented in the perspective direction of the front view.

[0034] Embodiment 1: In some embodiments, please refer to the Figures 1 - 6 of the specification drawings. A rotation prevention device for a globe valve stem includes a first rotation prevention block 1 and a second rotation prevention block 2. The first rotation prevention block 1 is located in front of the second rotation prevention block 2. Grooves 14 are provided in the middle of both the first rotation prevention block 1 and the second rotation prevention block 2. A valve stem 11 is provided in the middle of the two grooves 14. Planar grooves 12 are provided on the front and rear sides of the middle of the valve stem 11. The two planar grooves 12 are in fitting contact with the two grooves 14. Support rods 3 are symmetrically arranged on the left and right sides of the first rotation prevention block 1 and the second rotation prevention block 2;

[0035] A second through hole 5 is provided inside the first rotation prevention block 1, and a first through hole 4 is provided inside the second rotation prevention block 2. The first through hole 4 and the second through hole 5 are on the same center line. Both the first through hole 4 and the second through hole 5 are in fitting sliding connection with a moving rod 7. The rear side of the first through hole 4 is fixedly connected to one end of a spring 6, and the other end of the spring 6 is fixedly connected to the rear side of the moving rod 7. A knob 8 is fixedly installed at the front end of the moving rod 7;

[0036] The first rotation prevention block 1 is provided with an L-shaped groove 9 and a card slot 13 at the position of the second through hole 5. The rear end of the L-shaped groove 9 communicates with the card slot 13;

[0037] A sliding column 10 is fixedly installed on the side wall of the moving rod 7. The sliding column 10 is in fitting sliding connection with the L-shaped groove 9 and is engaged with the card slot 13.

[0038] The planar grooves 12 on the front and rear sides are arranged in parallel and symmetrically. The first rotation prevention block 1, the second rotation prevention block 2, and the two planar grooves 12 adopt double-plane contact. The planar grooves 12 processed on both sides of the valve stem 11 are parallel and symmetric, which is more conducive to bearing the torque received by the valve stem 11. Moreover, no drilling is required for the valve stem 11, and the strength and structural stability of the valve stem 11 are better.

[0039] The rear end of the first anti-rotation block 1 does not fit with the front end of the second anti-rotation block 2, leaving an assembly gap. The first anti-rotation block 1 and the second anti-rotation block 2 adopt a pair-mounted double-plate structure. The reserved assembly gap can ensure that the moving rod 7 tightly connects the first anti-rotation block 1, the second anti-rotation block 2 and the valve stem 11. The first anti-rotation block 1 and the second anti-rotation block 2 can only perform axial lifting and lowering movements along with the valve stem 11, ensuring the structural stability and improving the performance of the valve product.

[0040] The first through hole 4, the second through hole 5, the spring 6, the moving rod 7, the knob 8, the L-shaped groove 9, the sliding column 10, and the card slot 13 are all provided in multiple groups and are symmetrically arranged at the left and right ends of the valve stem 11 respectively.

[0041] For the first anti-rotation block 1 and the second anti-rotation block 2, a moving rod 7 can be installed at the middle position between the valve stem 11 and the support rod 3, or one can be drilled at the proximal end of the valve stem 11 and the proximal end of the support rod 3 respectively. The minimum number of the unilateral inner moving rod 7 is 1 for the first anti-rotation block, and the maximum does not exceed 2 for the second anti-rotation block;

[0042] The left and right sides of the first anti-rotation block 1 and the second anti-rotation block 2 are symmetrically provided with inclined surfaces. It is not limited to the inclined surfaces designed to cooperate with the support columns; it can also be a flat surface, an arc surface, etc.

[0043] The inclined surfaces on the left and right sides of the first anti-rotation block 1 and the second anti-rotation block 2 are respectively in sliding fit with the side walls of the two support rods 3.

[0044] The distance between the upper and lower ends of the first anti-rotation block 1 and the second anti-rotation block 2 is less than the distance between the upper and lower ends of the flat groove 12.

[0045] The lower ends of the first anti-rotation block 1 and the second anti-rotation block 2 are located on the same horizontal line as the lower end of the flat groove 12.

[0046] When the first anti-rotation block 1 and the second anti-rotation block 2 bear the driving torque, the moving rods 7 are arranged on both sides, making the force arms shorter and the formed stress smaller, ensuring the structural safety; the first anti-rotation block 1 and the second anti-rotation block 2 adopt a pair-mounted double-plate structure. When the valve stem 11 rotates in any direction, two limit positions act simultaneously, decomposing the unilateral bearing capacity and avoiding the unbalanced force caused by excessive local load;

[0047] When the valve stem 11 needs to be fixed, push the knob 8 inward by hand. The knob 8 drives the moving rod 7 to move. The moving rod 7 drives the sliding column 10 to slide in the L-shaped groove 9. When the sliding column 10 contacts the rear side of the L-shaped groove 9 and cannot be pushed further, then rotate the knob 8. The moving rod 7 rotates accordingly. The moving rod 7 drives the sliding column 10 to slide on the rear side of the L-shaped groove 9 until the sliding column 10 moves to the clamping groove 13. Under the action of the spring 6, the sliding column 10 is clamped and locked with the clamping groove 13, so that the groove 14 is closely attached to the flat grooves 12 on the front and rear sides of the moving rod 7. The first anti-rotation block 1 and the second anti-rotation block 2 radially fix the valve stem 11, so that the valve stem 11 can only move axially;

[0048] This utility model can effectively radially fix the valve stem 11, so that the valve stem 11 can only move axially; at the same time, the device can adapt to globe valves of various structures and can be quickly maintained, repaired and adjusted at the construction site.

[0049] 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 foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A device for preventing the rotation of the stem of a globe valve, characterized in that: It includes a first anti-rotation block (1) and a second anti-rotation block (2). The first anti-rotation block (1) is located on the front side of the second anti-rotation block (2). Grooves (14) are provided in the middle of both the first anti-rotation block (1) and the second anti-rotation block (2). A valve rod (11) is provided in the middle of the two grooves (14). Planar grooves (12) are provided on the front and rear sides of the middle of the valve rod (11). The two planar grooves (12) are in fitting contact with the two grooves (14). Support rods (3) are symmetrically arranged on the left and right sides of the first anti-rotation block (1) and the second anti-rotation block (2). A second through hole (5) is provided inside the first anti-rotation block (1), and a first through hole (4) is provided inside the second anti-rotation block (2). The first through hole (4) and the second through hole (5) are on the same center line. The first through hole (4) and the second through hole (5) are both in fitting sliding connection with a moving rod (7). The rear side of the first through hole (4) is fixedly connected to one end of a spring (6), and the other end of the spring (6) is fixedly connected to the rear side of the moving rod (7). A knob (8) is fixedly installed at the front end of the moving rod (7). The first anti-rotation block (1) is provided with an L-shaped groove (9) and a clamping groove (13) at the position of the second through hole (5). The rear end of the L-shaped groove (9) communicates with the clamping groove (13). A sliding column (10) is fixedly installed on the side wall of the moving rod (7). The sliding column (10) is in fitting sliding connection with the L-shaped groove (9), and the sliding column (10) is clamped with the clamping groove (13).

2. The anti-rotation device for the globe valve stem according to claim 1, characterized in that, The planar grooves (12) on the front and rear sides are symmetrically arranged in parallel.

3. The anti-rotation device for the globe valve stem according to claim 2, wherein, The rear end of the first anti-rotation block (1) does not fit with the front end of the second anti-rotation block (2), leaving an assembly gap.

4. The anti-rotation device for the stop valve stem according to claim 3, characterized in that, The first through hole (4), the second through hole (5), the spring (6), the moving rod (7), the knob (8), the L-shaped groove (9), the sliding column (10), and the clamping groove (13) are all provided in multiple groups and are symmetrically arranged at the left and right ends of the valve rod (11) respectively.

5. The anti-rotation device for the stop valve stem according to claim 4, characterized in that, The left and right sides of the first anti-rotation block (1) and the second anti-rotation block (2) are symmetrically provided with inclined surfaces.

6. The anti-rotation device for the stop valve stem according to claim 5, characterized in that, The inclined surfaces on the left and right sides of the first anti-rotation block (1) and the second anti-rotation block (2) are respectively in fitting sliding connection with the side walls of the two support rods (3).

7. The anti-rotation device for the globe valve stem according to claim 6, wherein, The distance between the upper and lower ends of the first anti-rotation block (1) and the second anti-rotation block (2) is less than the distance between the upper and lower ends of the planar groove (12).

8. The anti-rotation device for the stop valve stem according to claim 7, characterized in that, The lower ends of the first anti-rotation block (1) and the second anti-rotation block (2) are on the same horizontal line as the lower end of the planar groove (12).

Images