A self-relieving bolt fastening assembly

Abstract

This utility model discloses a self-relieving pressure bolt fastening assembly, belonging to the field of bolt technology. It includes a bolt body, a dust cover, and a conical block. The bolt body is hollow, with a main air inlet at the bottom and secondary air inlets on both sides of the lower end. The conical block is located at the bottom of the bolt body and connected to a metal piston. Multiple pressure relief grooves are formed on the inner wall of the bolt body, with pressure relief holes at the upper ends of the grooves. A main spring and a secondary spring are located on the top of the metal piston. When the main spring's force decreases, the secondary spring provides compensating force, maintaining accurate pressure control. The dust cover at the lower end of the bolt body prevents foreign objects from entering and clogging the main air inlet, secondary air inlets, pressure relief grooves, and pressure relief holes, thus preventing pressure relief failure. Rotating the adjusting bolt moves a movable plate, changing the spring compression and adjusting the pressure relief pressure to suit various application scenarios.

Description

Technical Field

[0001] This utility model belongs to the field of bolt technology, specifically relating to a self-relieving bolt fastening assembly. Background Technology

[0002] Self-relieving bolts are bolts that automatically regulate pressure on the basis of fastening connections. In some production equipment, bolts are often used to fix the connections of pipes and containers. Some enclosed spaces are not used as pressure vessels and do not generate pollution sources of exhaust gas, so they are often overlooked and do not adopt pressure relief protection devices. When a malfunction causes the internal pressure of the container to rise, the high-pressure gas can easily damage the equipment and cause accidents. Therefore, a self-relieving bolt fastening assembly is needed to solve the above problems. Utility Model Content

[0003] To solve the above-mentioned technical problems, a self-relieving bolt fastening assembly is provided, which solves the problem that high-pressure gas inside pipelines or containers can easily damage equipment and cause accidents when pressure increases suddenly.

[0004] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A self-relieving bolt fastening assembly includes a bolt body, a dust cover, and a conical block. The bolt body is hollow, with a main air inlet at its bottom and secondary air inlets on both sides of its lower end. The conical block is located at the bottom of the bolt body, with its outer surface fitting against the inner wall of the bolt body. The conical block is fixedly connected to the bottom of a metal piston, which is in close contact with and slidably connected to the inner wall of the bolt body. The inner wall of the bolt body has multiple pressure relief grooves evenly arranged longitudinally. Each pressure relief groove has a pressure relief hole at its upper end, which penetrates the side wall of the bolt body and communicates with an internal through-hole. A main spring and a secondary spring are located on the top of the metal piston.

[0005] Preferably, the top of the metal piston is provided with a first mounting groove, the main spring is installed inside the first mounting groove, and a plurality of second mounting grooves are arranged in a circular pattern around the first mounting groove, and the auxiliary spring is installed inside the second mounting groove.

[0006] Preferably, a movable plate is provided above the main spring and the auxiliary spring, and an abutment seat is provided at the center of the top of the movable plate, with an adjusting bolt rotatably connected inside the abutment seat.

[0007] Preferably, the middle part of the adjusting bolt is threadedly connected to the mounting plate, the mounting plate is disposed inside the bolt body, and a snap ring is installed above the mounting plate, the snap ring engaging with a groove opened on the inner wall of the bolt body.

[0008] Preferably, a sealing ring is provided below the pressure relief vent groove, the sealing ring is engaged in the mounting groove on the inner wall of the bolt body, and the sealing ring is slidably connected to the side wall of the metal piston.

[0009] Preferably, a dust cover is connected to the lower end of the bolt body.

[0010] The advantages of this utility model compared with the prior art are: 1. This design includes a main spring and a secondary spring. The main spring provides the main elastic force. Under constant compression deformation, the internal residual stress of the main spring is gradually released, and the elastic coefficient decreases, resulting in a decrease in the elastic force under the same deformation. Through the joint action of the main spring and the secondary spring, the secondary spring provides compensating elastic force when the elastic force of the main spring decreases, thus maintaining the accuracy of pressure control.

[0011] 2. This solution is equipped with an adjusting bolt. Rotating the adjusting bolt will push the movable plate to move. The downward movement of the movable plate can push the main spring and the auxiliary spring to compress, which increases the elastic force that the metal piston has to overcome to move the same height, thereby increasing the pressure relief pressure. The pressure relief pressure can be flexibly adjusted by rotating the adjusting bolt to adapt to more application scenarios.

[0012] 3. This solution is equipped with a dust cover, which is located at the lower end of the bolt body. It can block foreign objects and prevent them from entering the bolt body during pressure relief, thus preventing them from clogging the main air inlet, secondary air inlet, pressure relief guide groove, and pressure relief hole, which would cause the pressure relief function to fail. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is a schematic diagram of the internal structure of the present invention; Figure 3 This is a bottom view of the structure of this utility model.

[0014] The numbers on the map are: 1. Bolt body; 11. Main air inlet; 12. Secondary air inlet; 13. Pressure relief guide groove; 14. Pressure relief hole; 15. Sealing ring; 2. Dust cover; 3. Conical block; 4. Metal piston; 41. First mounting groove; 42. Second mounting groove; 5. Main spring; 6. Secondary spring; 7. Movable plate; 71. Abutment seat; 72. Adjusting bolt; 8. Mounting plate; 81. Snap ring. Detailed Implementation

[0015] The following description is intended to disclose the present invention so that those skilled in the art can implement it. The preferred embodiments described below are merely examples, and other obvious variations will occur to those skilled in the art.

[0016] like Figures 1-3As shown, a self-relieving bolt fastening assembly includes a bolt body 1, a dust cover 2, and a conical block 3. The bolt body 1 is hollow, with a main air inlet 11 at its bottom and secondary air inlets 12 on both sides of its lower end. The secondary air inlets 12 communicate with the internal through-hole of the bolt body 1. The conical block 3 is located at the bottom of the bolt body 1, with its outer surface fitting against the inner wall of the bottom of the bolt body 1. Gas applies pressure to the conical block 3 through the main air inlet 11 and the secondary air inlets 12, pushing the conical block 3 to move. The bottom of the metal piston 4 is fixedly connected to the bolt body 1. The metal piston 4 is in close contact with and slidably connected to the inner wall of the bolt body 1. The movement of the conical block 3 drives the metal piston 4 to move synchronously. The inner wall of the bolt body 1 has multiple pressure relief grooves 13, which are evenly arranged longitudinally. The upper end of the pressure relief groove 13 has a pressure relief hole 14, which penetrates the side wall of the bolt body 1 and communicates with the internal through hole of the bolt body 1. When the pressure is too high, the gas pushes the conical block 3 and the metal piston 4 to move upward. When the lower end of the metal piston 4 is higher than the pressure relief groove 13, the pressure relief hole 14 is connected to the inner wall of the bolt body 1. When the gas reaches the bottom of the gas groove 13, the gas is discharged to the outside through the pressure relief groove 13 and the pressure relief hole 14, completing the pressure relief. A sealing ring 15 is provided below the pressure relief groove 13. The sealing ring 15 is snapped into the mounting groove on the inner wall of the bolt body 1. The sealing ring 15 is slidably connected to the side wall of the metal piston 4. The sealing ring 15 seals the space below the metal piston 4 to prevent gas leakage. A main spring 5 and a secondary spring 6 are provided on the top of the metal piston 4. A first mounting groove 41 is opened on the top of the metal piston 4, and the main spring 5 is installed inside the first mounting groove 41. The first mounting groove 41 has multiple second mounting grooves 42 arranged in a circle around its perimeter. The auxiliary spring 6 is installed inside the second mounting groove 42. The wire diameter of the main spring 5 is larger than that of the auxiliary spring 6. The main spring 5 provides the main elastic force, and the multiple auxiliary springs 6 provide assistance. After long-term use, under constant compression deformation, the internal residual stress of the main spring 5 is gradually released, and the elastic coefficient decreases, resulting in a decrease in elastic force under the same deformation. Through the joint action of the main spring 5 and the auxiliary spring 6, when the elastic force of the main spring 5 decreases, the auxiliary spring 6 provides compensating elastic force, thereby improving the accuracy of pressure control.

[0017] The main spring 5 and the auxiliary spring 6 are provided with a movable plate 7 above them. The top center of the movable plate 7 is provided with an abutment seat 71. An adjusting bolt 72 is rotatably connected inside the abutment seat 71. The middle part of the adjusting bolt 72 is threadedly connected to the mounting plate 8. The mounting plate 8 is located inside the bolt body 1. A snap ring 81 is installed above the mounting plate 8. The snap ring 81 snaps into a groove opened on the inner wall of the bolt body 1. The mounting plate 8 is fixed by the snap ring 81. The adjusting bolt 72 can rotate and descend along the movable plate 7, which can push the movable plate 7 to move downward. The downward movement of the movable plate 7 can push the main spring 5 and the auxiliary spring 6 to compress, thereby adjusting the pressure relief.

[0018] In this embodiment, a dust cover 2 is connected to the lower end of the bolt body 1. The dust cover 2 can block foreign objects and prevent them from entering the bolt body 1 during pressure relief, thus preventing them from blocking the main air inlet 11, the auxiliary air inlet 12, the pressure relief guide groove 13, and the pressure relief hole 14, which would cause the pressure relief function to fail.

[0019] The principle of this utility model is as follows: When the pressure inside the pipe or container is too high, the gas enters the bolt body 1 through the main air inlet 11 and the auxiliary air inlet 12, pushing the conical block 3 and the metal piston 4 to move upward against the elastic force of the main spring 5 and the auxiliary spring 6. When the pressure reaches the threshold, the lower end of the metal piston 4 moves to the bottom of the pressure relief guide groove 13, and the gas is discharged to the outside through the pressure relief guide groove 13 and the pressure relief hole 14, thus completing the pressure relief. The main spring 5 and the auxiliary spring 6 provide elastic force. When the elastic force of the main spring 5 decreases, the auxiliary spring 6 provides compensating elastic force to improve the accuracy of pressure control. When it is necessary to adjust the pressure relief, rotate the adjusting bolt 72. The adjusting bolt 72 descends and pushes the movable plate 7 downward. The downward movement of the movable plate 7 can push the main spring 5 and the auxiliary spring 6 to compress, thereby adjusting the pressure relief.

[0020] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A self-relieving bolted fastener assembly, characterized by: The device includes a bolt body (1), a dust cover (2), and a conical block (3). The bolt body (1) is hollow, with a main air inlet (11) at the bottom and secondary air inlets (12) on both sides of the lower end. The conical block (3) is located at the bottom of the bolt body (1), with its outer surface fitting against the inner wall of the bottom of the bolt body (1). The conical block (3) is fixedly connected to the bottom of a metal piston (4). The metal piston (4) is in close contact with and slidably connected to the inner wall of the bolt body (1). The inner wall of the bolt body (1) has multiple pressure relief grooves (13), which are evenly arranged longitudinally. The upper end of the pressure relief groove (13) is provided with a pressure relief hole (14), which penetrates the side wall of the bolt body (1) and communicates with the internal through hole of the bolt body (1). The top of the metal piston (4) is provided with a main spring (5) and a secondary spring (6).

2. A self-relieving bolted fastener assembly according to claim 1, wherein: The metal piston (4) has a first mounting groove (41) on its top. The main spring (5) is installed inside the first mounting groove (41). The first mounting groove (41) has multiple second mounting grooves (42) arranged in a circle around its perimeter. The auxiliary spring (6) is installed inside the second mounting groove (42).

3. A self-relieving bolted fastener assembly according to claim 2, wherein: A movable plate (7) is provided above the main spring (5) and the auxiliary spring (6). An abutment seat (71) is provided at the top center of the movable plate (7). An adjusting bolt (72) is rotatably connected inside the abutment seat (71).

4. A self-relieving bolted fastener assembly according to claim 3, wherein: The middle part of the adjusting bolt (72) is threadedly connected to the mounting plate (8). The mounting plate (8) is located inside the bolt body (1). A snap ring (81) is installed above the mounting plate (8). The snap ring (81) snaps into the groove opened on the inner wall of the bolt body (1).

5. A self-relieving bolted fastener assembly according to claim 1, wherein: A sealing ring (15) is provided below the pressure relief vent groove (13). The sealing ring (15) is snapped into the mounting groove on the inner wall of the bolt body (1). The sealing ring (15) is slidably connected to the side wall of the metal piston (4).

6. A self-relieving bolted fastener assembly according to claim 1, wherein: The lower end of the bolt body (1) is connected to a dust cover (2).

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