Anti-loosening fastening structure applied to a safety valve

Abstract

The utility model relates to safety valve technical field especially relates to a kind of anti-loosening fastening structure applied to safety valve, including safety valve body, the top of safety valve body is fixedly connected with lower installation flange, the upper of safety valve body is provided with bonnet, the bottom of bonnet is fixedly connected with upper installation flange, and the upper installation flange is connected between lower installation flange by fastening bolt. Through the cooperation of wedge-shaped convex ridge and wedge-shaped pit, the fastening bolt can be automatically guided to align during assembly, which is beneficial to eliminate installation deviation. After fastening, the two positioning blocks are clamped in opposite directions, the fastening bolt is clamped and limited in the clamping groove, the clamping groove and the positioning pin form mechanical interlocking, effectively limiting the radial displacement of the fastening bolt. After fastening, the side extrusion force converts the torque into radial constraint, effectively inhibiting the bolt from rotating and loosening, reducing the impact of alternating load on the fastening bolt, and significantly improving the anti-loosening ability of the fastening bolt and the stability under vibration conditions.

Description

Technical Field

[0001] This utility model relates to the field of safety valve technology, and in particular to an anti-loosening fastening structure applied to safety valves. Background Technology

[0002] A safety valve is a special valve whose opening and closing element is normally closed under external force. When the pressure of the medium in the equipment or pipeline rises above a specified value, it discharges the medium to the outside of the system to prevent the pressure of the medium in the pipeline or equipment from exceeding the specified value. In traditional safety valve installation, connecting flanges is the most common installation method. The safety valve is mainly fixed to the pipeline or equipment using bolts. This connection method was widely used for a long time due to its simple structure, ease of operation, and low cost.

[0003] However, with the continuous expansion of industrial production scale and the increasing complexity of equipment operating conditions, industrial systems often operate continuously for extended periods, experiencing frequent starts, stops, or high-frequency vibrations. Under these conditions, the connection points of safety valves are subjected to alternating loads. Under repeated alternating loads, bolts gradually loosen, leading to a decrease in the preload of the connection. Existing safety valve connection structures generally lack effective bolt tightening designs, typically relying solely on simple axial fixing with ordinary nuts. This makes it difficult to maintain stable bolt preload, reducing bolt strength and consequently affecting the sealing performance and normal operation of the safety valve. Utility Model Content

[0004] The purpose of this invention is to address the shortcomings of existing technologies by proposing an anti-loosening fastening structure for safety valves.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] An anti-loosening fastening structure for a safety valve includes a safety valve body, a lower mounting flange fixedly connected to the top of the safety valve body, a valve cover provided above the safety valve body, an upper mounting flange fixedly connected to the bottom of the valve cover, and the upper mounting flange and the lower mounting flange being connected by fastening bolts.

[0007] The bottom of the lower mounting flange is fixedly connected to a fixed mounting base. A drive handle is provided on one side of the outer wall of the fixed mounting base. A screw is fixedly connected to the end of the drive handle. The outer surface of the screw is provided with two threaded sections with opposite directions of rotation. The outer surfaces of the two threaded sections are respectively threaded to a first positioning block and a second positioning block. The inner walls of the first positioning block and the second positioning block are each provided with a sliding cavity. The inner walls of the sliding cavities are respectively provided with threaded grooves that mate with the threaded sections. The outer walls of the first positioning block and the second positioning block are provided with locking grooves that mate with the bottom of the fastening bolts.

[0008] Preferably, the bottom of the fastening bolt is fixedly connected with a wedge-shaped protrusion, and a butterfly spring washer is sleeved between the wedge-shaped protrusion and the fastening bolt. The bottom of the locking groove is provided with a wedge-shaped recess that matches the wedge-shaped protrusion.

[0009] Preferably, the bottom of the outer wall of the fastening bolt is provided with a plurality of circular through holes, the first positioning block is provided with a positioning hole on the side near the fastening bolt, and the second positioning block is fixedly connected with a positioning pin on the side near the fastening bolt, one end of the positioning pin passing through the circular through holes and being engaged in the positioning hole.

[0010] Preferably, the first positioning block and the second positioning block each have an annular groove on their opposite sides, and the two annular grooves are connected to each other by a connecting spring.

[0011] Preferably, the outer surface of the drive handle has two staggered snap-fit ​​grooves, and the outer wall of the fixed mounting base has two sets of mounting holes. Each of the two sets of mounting holes is provided with a clamping elastic band, which is staggered and snapped into the snap-fit ​​groove. The outer layer of the clamping elastic band has a textured surface and is made of high-strength synthetic fiber, while the inner layer is provided with reinforcing ribs.

[0012] Preferably, the gap between the inner wall of the wedge-shaped recess and the side of the wedge-shaped protrusion is ≤0.05mm, and the entrance of the wedge-shaped recess has a taper of 1°-3°.

[0013] The beneficial effects of this utility model are:

[0014] The wedge-shaped protrusions and recesses work together to automatically guide the fastening bolts to align during assembly, which helps to eliminate installation deviations. After fastening, two positioning blocks clamp the fastening bolts in opposite directions, locking them in the locking groove. The locking groove and positioning pin form a mechanical interlock, effectively limiting the radial displacement of the fastening bolts. After fastening, the lateral extrusion force converts the torque into radial constraint, effectively suppressing bolt rotation and loosening, reducing the impact of alternating loads on the fastening bolts, and significantly improving the anti-loosening ability and stability of the fastening bolts under vibration conditions.

[0015] Two elastic bands are interlocked in an "X" shape within the locking groove to form a cross constraint, which helps to lock the rotational freedom of the drive handle and prevent the drive handle from deflecting due to external forces. The elastic bands are made of high-strength fiber and reinforcing rib composite structure, which makes them both wear-resistant and tensile-resistant, and they are not prone to aging after long-term use, thus enhancing the shape stability and durability of the elastic bands. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of an anti-loosening fastening structure for a safety valve proposed in this utility model;

[0017] Figure 2 This utility model proposes an anti-loosening fastening structure for use in safety valves. Figure 1 A magnified structural diagram of point A in the middle;

[0018] Figure 3 This utility model provides a schematic diagram of the connection structure between the fastening bolt and the first positioning block and the second positioning block in an anti-loosening fastening structure for a safety valve.

[0019] Figure 4 This is a cross-sectional schematic diagram of the connection structure between the fastening bolt and the first positioning block and the second positioning block in an anti-loosening fastening structure for a safety valve, as proposed in this utility model.

[0020] In the picture:

[0021] 1. Safety valve body; 2. Lower mounting flange; 3. Valve cover; 4. Upper mounting flange; 5. Fastening bolts; 6. Fixed mounting base; 7. Drive handle; 8. Screw; 9. First positioning block; 10. Second positioning block; 11. Engagement groove; 12. Wedge-shaped protrusion; 13. Butterfly spring washer; 14. Circular through hole; 15. Positioning pin; 16. Annular groove; 17. Connecting spring; 18. Engagement groove; 19. Elastic band. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present utility model. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments.

[0023] The contents not described in detail in this specification are existing technologies known to those skilled in the art.

[0024] All standard parts used in this utility model can be purchased from the market, and irregular parts can be customized according to the description and drawings. The specific connection methods of each part adopt conventional methods such as bolts, rivets, and welding that are mature in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts conventional connection methods in the prior art, which will not be described in detail here.

[0025] Example:

[0026] Reference Figure 1-4 An anti-loosening fastening structure for a safety valve includes a safety valve body 1, a lower mounting flange 2 fixedly connected to the top of the safety valve body 1, a valve cover 3 provided above the safety valve body 1, an upper mounting flange 4 fixedly connected to the bottom of the valve cover 3, and the upper mounting flange 4 and the lower mounting flange 2 being connected by fastening bolts 5.

[0027] A fixed mounting base 6 is fixedly connected to the bottom of the lower mounting flange 2. A drive handle 7 is provided on one side of the outer wall of the fixed mounting base 6. A screw 8 is fixedly connected to the end of the drive handle 7. The outer surface of the screw 8 is provided with two threaded sections with opposite directions of rotation. The outer surfaces of the two threaded sections are respectively threaded to a first positioning block 9 and a second positioning block 10. The inner walls of the first positioning block 9 and the second positioning block 10 are provided with sliding cavities. The inner walls of the sliding cavities are respectively provided with threaded grooves that mate with the threaded sections. The outer walls of the first positioning block 9 and the second positioning block 10 are provided with locking grooves 11 that mate with the bottom of the fastening bolt 5.

[0028] The bottom of the fastening bolt 5 is fixedly connected with a wedge-shaped protrusion 12, and a butterfly spring washer 13 is sleeved between the wedge-shaped protrusion 12 and the fastening bolt 5. The bottom of the locking groove 11 is provided with a wedge-shaped recess that matches the wedge-shaped protrusion 12.

[0029] The bottom of the outer wall of the fastening bolt 5 has several circular through holes 14. The first positioning block 9 has a positioning hole on the side near the fastening bolt 5. The second positioning block 10 has a positioning pin 15 fixedly connected on the side near the fastening bolt 5. One end of the positioning pin 15 passes through the circular through hole 14 and is engaged in the positioning hole.

[0030] Both the first positioning block 9 and the second positioning block 10 have annular grooves 16 on their opposite sides, and the two annular grooves 16 are connected to each other by a connecting spring 17.

[0031] The outer surface of the drive handle 7 is provided with two staggered snap-fit ​​grooves 18, and the outer wall of the fixed mounting base 6 is provided with two sets of mounting holes. Each set of mounting holes is provided with a tight-fitting elastic band 19. The tight-fitting elastic band 19 is staggered and snapped into the snap-fit ​​grooves 18. The outer layer of the tight-fitting elastic band 19 is provided with a textured surface and is made of high-strength synthetic fiber, and the inner layer is provided with reinforcing ribs.

[0032] The gap between the inner wall of the wedge-shaped recess and the side of the wedge-shaped protrusion 12 is ≤0.05mm, and the entrance of the wedge-shaped recess has a taper of 1°-3°.

[0033] In this embodiment, when connecting and installing the safety valve body 1 and the valve cover 3, the fastening bolts 5 are sequentially inserted into the bolt holes of the upper mounting flange 4 and the lower mounting flange 2 to complete the connection between the upper mounting flange 4 and the lower mounting flange 2. When the fastening bolts 5 are inserted into the bolt holes and continue to move downwards, they contact the side wall of the locking groove 11. At this time, by rotating the drive handle 7, the drive handle 7 drives the screw 8 to rotate. When the screw 8 rotates, it drives the two threaded sections on its outer surface to rotate synchronously. Subsequently, when the two threaded sections rotate, their threads drive the first positioning block 9 and the second positioning block 10 to move towards each other synchronously. When the fastening bolts 5 gradually fall to the surface of the locking groove 11, the wedge-shaped protrusion 12 at its bottom engages in the wedge-shaped recess. Then, the positioning pin 15 on one side of the second positioning block 10 passes through the circular through hole 14 on the side wall of the fastening bolts 5, and inserts the positioning pin 15 into the first positioning block 9 during the continuous movement of the first positioning block 9 and the second positioning block 10. Inside the positioning holes on the side, the first positioning block 9 and the second positioning block 10 are used to fix the fastening bolt 5, so that the bottom of the fastening bolt 5 can be completely fitted and restricted in the locking groove 11. At this time, the bottom of the wedge-shaped protrusion 12 fits against the inner wall of the wedge-shaped recess, and the 1°-3° tapered entrance of the wedge-shaped recess can guide the fastening bolt 5 to quickly align during the falling process, so that even if there is an assembly error, it can still be automatically corrected by the tapered surface, avoiding the jamming caused by traditional forced alignment. When the equipment vibrates, the wedge-shaped protrusion 12 contacts the inner wall of the wedge-shaped recess, which also increases its contact area, disperses the vibration energy, and makes the axial force evenly distributed. At this time, the locking groove 11 and the wedge-shaped recess fit and constrain the fastening bolt 5 from the side, thereby converting the torque into the side extrusion force, restricting the rotation and loosening of the fastening bolt 5, and improving its anti-loosening ability. At the same time, the butterfly spring washer 13 at the bottom of the fastening bolt 5 can further absorb the vibration energy, so that the fastening bolt 5 remains in a stable state.

[0034] Furthermore, after the fastening bolt 5 is positioned, the two elastic bands 19 on the outer wall of the fixed mounting base 6 are stretched to generate a preload. The elastic bands 19 are then interlocked in an "X" shape within the locking groove 18 of the drive handle 7. The preload acts on the locking groove 18 of the drive handle 7, forming a cross-shaped constraint, thereby locking the rotational freedom of the drive handle 7 and preventing deflection due to external forces. This further enhances the fastening bolt 5's resistance to loosening and its tightening ability. The textured surface of the outer layer of the elastic band 19 increases the friction with the inner wall of the locking groove 18, preventing slippage and dispersing pressure and reducing wear to some extent. Since the outer layer of the elastic band 19 is made of high-strength synthetic fiber, it provides wear-resistant and high-strength protection. The inner reinforcing ribs enhance the tensile and wear resistance of the elastic band 19, improving its shape stability and durability.

[0035] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0036] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0037] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any equivalent substitutions or changes made by those skilled in the art within the technical scope disclosed in the present utility model, based on the technical solution and the inventive concept of the present utility model, should be included within the protection scope of the present utility model.

Claims

1. A non-loosening fastening structure for a safety valve, comprising a safety valve body (1), characterized in that, The top of the safety valve body (1) is fixedly connected to a lower mounting flange (2), and a valve cover (3) is provided above the safety valve body (1). The bottom of the valve cover (3) is fixedly connected to an upper mounting flange (4), and the upper mounting flange (4) and the lower mounting flange (2) are connected by fastening bolts (5). The bottom of the lower mounting flange (2) is fixedly connected to a fixed mounting base (6). A drive handle (7) is provided on one side of the outer wall of the fixed mounting base (6). A screw (8) is fixedly connected to the end of the drive handle (7). The outer surface of the screw (8) is provided with two threaded sections with opposite directions. The outer surfaces of the two threaded sections are respectively threaded with a first positioning block (9) and a second positioning block (10). The inner walls of the first positioning block (9) and the second positioning block (10) are provided with sliding cavities. The inner walls of the sliding cavities are respectively provided with threaded grooves that cooperate with the threaded sections. The outer walls of the first positioning block (9) and the second positioning block (10) are provided with locking grooves (11) that fit with the bottom of the fastening bolt (5).

2. The anti-loosening fastening structure for a safety valve according to claim 1, characterized in that, The bottom of the fastening bolt (5) is fixedly connected with a wedge-shaped protrusion (12), and a butterfly spring washer (13) is sleeved between the wedge-shaped protrusion (12) and the fastening bolt (5). The bottom of the locking groove (11) is provided with a wedge-shaped recess that matches the wedge-shaped protrusion (12).

3. The anti-loosening fastening structure for a safety valve according to claim 1, characterized in that, The bottom of the outer wall of the fastening bolt (5) is provided with several circular through holes (14). The first positioning block (9) is provided with a positioning hole on the side near the fastening bolt (5). The second positioning block (10) is fixedly connected with a positioning pin (15) on the side near the fastening bolt (5). One end of the positioning pin (15) passes through the circular through hole (14) and is engaged in the positioning hole.

4. The anti-loosening fastening structure for a safety valve according to claim 1, characterized in that, The first positioning block (9) and the second positioning block (10) each have an annular groove (16) on their opposite sides, and the two annular grooves (16) are connected to each other by a connecting spring (17).

5. The anti-loosening fastening structure for a safety valve according to claim 1, characterized in that, The outer surface of the drive handle (7) is provided with two staggered snap-fit ​​grooves (18), and the outer wall of the fixed mounting base (6) is provided with two sets of mounting holes. Each of the two sets of mounting holes is provided with a tight-fitting elastic band (19). The tight-fitting elastic band (19) is staggered and snapped into the snap-fit ​​grooves (18). The outer layer of the tight-fitting elastic band (19) is provided with a textured surface and is made of high-strength synthetic fiber, and the inner layer is provided with reinforcing ribs.

6. The anti-loosening fastening structure for a safety valve according to claim 2, characterized in that, The gap between the inner wall of the wedge-shaped recess and the side of the wedge-shaped protrusion (12) is ≤0.05mm, and the entrance of the wedge-shaped recess has a taper of 1°-3°.

Images