Safety valve for preventing spring from rotating

Abstract

The utility model discloses a safety valve capable of preventing a spring from rotating, relates to the technical field of safety valves, and solves the problem of unstable setting pressure caused by rotation of the spring during frequent opening and closing. A sliding hole is formed in the guide sleeve, a pin hole is formed in the bottom of the lower seat body, an anti-rotating pin movably penetrates through the sliding hole from bottom to top, and the top end of the anti-rotating pin is further fixedly inserted into the pin hole in a penetrating mode. The position of the lower seat body is fixed by using the anti-rotating pin, so that the spring can be effectively prevented from rotating along with the lower seat body, distortion caused by rotation of the spring can be avoided, the original elastic coefficient of the spring is kept, and the stability of pre-tightening force is ensured; consistency of the set pressure can be maintained, it is ensured that the safety valve can still keep a good working state under the working condition of frequent opening and closing, and the possibility of inaccurate opening and closing is reduced. By ensuring that the spring and the lower seat body do not rotate, the overall performance and reliability of the safety valve are improved, and therefore the safety and stability of a system are enhanced.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, in particular to a safety valve that prevents a spring from rotating. Background Art

[0002] A safety valve is a special type of valve that mainly relies on the elastic force of the spring to control the opening and closing of the valve. It remains closed under normal working conditions and will only open automatically when the system pressure exceeds the set safety threshold to prevent overpressure damage. The set pressure of a spring-loaded safety valve refers to the pressure value when the safety valve starts to open, which is set by adjusting the preload of the spring. In some special working conditions, due to frequent changes in pressure, the opening and closing of the safety valve are frequently switched, which can easily cause the lower seat of the spring to rotate under force. The rotation of the lower seat of the spring will drive the rotation of the spring and affect the preload of the spring, thereby affecting the stability of the set pressure. The spring may be twisted and deformed when rotating, which will affect the elastic coefficient (stiffness) of the spring and the size of the preload. The twisting of the spring may also cause changes in its compression or stretching behavior, resulting in uneven distribution of the preload. The uneven degree of compression may cause deviations in the opening pressure of the safety valve, affecting the consistency of the set pressure. Summary of the invention

[0003] Purpose of the utility model: In order to overcome the defects of the prior art, the utility model provides a safety valve that prevents spring rotation, and solves the problem of unstable set pressure caused by rotation of the spring during frequent opening and closing.

[0004] The technical solution of the utility model comprises a valve body, a valve cover and a recoil disc, a spring is arranged in the valve cover, a lower seat body is installed at the lower end of the spring, a guide sleeve is fixedly installed between the valve body and the valve cover, the recoil disc and the guide sleeve are relatively movable axially, a sliding hole is arranged on the guide sleeve, a pin hole is arranged at the bottom of the lower seat body, an anti-rotation pin is movably penetrated from bottom to top in the sliding hole, and the top end of the anti-rotation pin is also fixedly inserted in the pin hole.

[0005] By adopting the above technical solution, the spring can be effectively prevented from rotating with the lower seat body by using an anti-rotation pin to fix the position of the lower seat body. In this way, the twisting deformation of the spring caused by rotation can be avoided, and the original elastic coefficient (stiffness) of the spring can be maintained, thereby ensuring the stability of the preload force; this helps to maintain the consistency of the set pressure, ensure that the safety valve can still maintain a good working condition under frequent opening and closing conditions, and reduce the possibility of inaccurate opening and closing; by ensuring that the spring and the lower seat body do not rotate, the overall performance and reliability of the safety valve are improved, thereby enhancing the safety and stability of the system.

[0006] In a possible design, the guide sleeve includes a sleeve and a sleeve disc, the recoil disc moves in the sleeve, and the sleeve disc is fixed between the valve body and the valve cover; an inner edge portion extends inward from the top opening of the sleeve, and there are two sliding holes that are evenly arranged along the circumferential direction of the inner edge portion.

[0007] By adopting the above design, the guide sleeve is firmly installed at the key position of the safety valve through the valve body and the valve cover fixing sleeve, and the inner edge is extended at the top opening of the sleeve to provide an ideal installation position for the anti-rotation pin. The design is reasonable and efficient, and it is convenient for the installation and fixation of the anti-rotation pin; in addition, anti-rotation pins are installed in the two sliding holes to ensure the effect of preventing rotation.

[0008] In a possible design, the pin hole is in the shape of a blind hole and is formed from bottom to top, the pin hole is opposite to the sliding hole, and the anti-rotation pin is tightly fitted in the pin hole.

[0009] With the above design, the blind hole not only ensures the fixation of the anti-rotation pin, but also reduces the impact on the lower seat body, ensuring that the anti-rotation pin can be firmly fixed in the lower seat body to prevent it from loosening or falling off during use. The tight fit improves the tightness and stability of the connection, ensuring the reliability of the anti-rotation pin when subjected to changes in system pressure.

[0010] In a possible design, a sealing ring is installed in the gap between the recoil disk and the guide sleeve.

[0011] With the above design, the sealing ring can reduce noise to a great extent, making the opening and closing process of the safety valve quieter. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a cross-sectional view of a specific embodiment of the utility model;

[0013] Figure 2 For this utility model Figure 1 A partial enlarged view of the middle A;

[0014] Figure 3 It is a cross-sectional structural diagram of the lower seat body and the anti-rotation pin of the utility model;

[0015] Figure 4 It is a schematic diagram of the cross-sectional structure of the guide sleeve of the utility model;

[0016] Among them, 1. valve body; 2. valve cover; 3. recoil disc; 4. spring; 5. lower seat body; 51. pin hole; 6. guide sleeve; 61. sliding hole; 62. sleeve; 63. sleeve disc; 64. inner edge; 65. sealing ring; 66. through hole; 7. anti-rotation pin. DETAILED DESCRIPTION

[0017] like Figure 1-Figure 4A safety valve for preventing spring rotation is shown, comprising a valve body 1, a valve cover 2 and a recoil disc 3. A spring 4 is arranged inside the valve cover 2, and the spring 4 is used to provide a preload force to control the opening and closing of the safety valve. A lower seat body 5 is installed at the lower end of the spring 4, and the lower end of the spring 4 presses against the lower seat body 5, so that the lower seat body 5 can fix the height position of the spring 4. A guide sleeve 6 is fixedly installed between the valve body 1 and the valve cover 2, and the recoil disc 3 and the guide sleeve 6 are axially movable relative to each other, and a sleeve 62 is used to guide the axial movement of the recoil disc 3. A sliding hole 61 is provided on the guide sleeve 6, and a pin hole 51 is provided at the bottom of the lower seat body 5. An anti-rotation pin 7 is movably inserted from bottom to top in the sliding hole 61, and the top end of the anti-rotation pin 7 is also fixedly inserted in the pin hole 51. Under the action of the medium pressure, the anti-rotation pin 7 forces the recoil disc 3 to move upward, prompting the lower seat body 5 to move upward. In the process of the recoil disc 3 being frequently opened and closed due to the unstable medium pressure, the lower seat body 5 floats up and down repeatedly, and the anti-rotation pin 7 moves in the axial direction of the sliding hole 61, and will not escape from the limit in the radial direction of the sliding hole 61. In this way, the lower seat body 5 is always limited by the anti-rotation pin 7 during the opening and closing process to avoid rotation, so that the spring 4 maintains a stable elastic effect and maintains the set pressure of the safety valve basically consistent. During assembly, after the lower seat body 5 is installed, the anti-rotation pin 7 is inserted from bottom to top in the sliding hole 61 of the guide sleeve 6, and it is ensured that the top end of the anti-rotation pin is fixedly inserted in the pin hole 51 of the lower seat body 5.

[0018] The guide sleeve 6 includes a sleeve 62 and a sleeve disc 63. The recoil disc 3 is slidably matched with the inner wall of the sleeve 62. The sleeve disc 63 is located in the outer peripheral direction of the top opening of the sleeve 62. The guide sleeve 6 is fixed between the valve body 1 and the valve cover 2 through the sleeve disc 63. An inner edge 64 is integrally extended inward from the top opening of the sleeve 62. There are two sliding holes 61 and they are evenly arranged along the circumferential direction of the inner edge 64. This means that there are also two anti-rotation pins 7, which are respectively inserted into the corresponding sliding holes 61. The number of two can not only ensure the anti-rotation effect, but also reduce the difficulty of processing. A through hole 66 needs to be set at the center of the inner edge 64 for the valve stem to pass through, and the valve stem needs to be connected to the recoil disc 3.

[0019] The pin hole 51 is in the shape of a blind hole and is formed from bottom to top. The pin hole 51 is opposite to the sliding hole 61, and the anti-rotation pin 7 is tightly fixed with the pin hole 51 by interference fit. The anti-rotation pin 7 only penetrates into the lower seat body 5 and does not penetrate the lower seat body 5, so as to avoid direct contact between the anti-rotation pin 7 and the spring 4 and reduce the impact on the spring 4. In order to further fix the anti-rotation pin 7, the pin hole 51 and the anti-rotation pin 7 can be fixed by welding.

[0020] A sealing ring 65 is installed in the gap between the recoil disc 3 and the guide sleeve 6 , and the sealing ring 65 is placed in the inner wall groove of the guide sleeve 6 .

Claims

1. A safety valve for preventing a spring from rotating, comprising a valve body (1), a valve cover (2) and a recoil disc (3), wherein a spring (4) is arranged inside the valve cover (2), a lower seat body (5) is mounted at the lower end of the spring (4), a guide sleeve (6) is fixedly mounted between the valve body (1) and the valve cover (2), and the recoil disc (3) and the guide sleeve (6) are axially movable relative to each other, and characterized in that: The guide sleeve (6) is provided with a sliding hole (61), the bottom of the lower seat body (5) is provided with a pin hole (51), an anti-rotation pin (7) is movably inserted from bottom to top in the sliding hole (61), and the top end of the anti-rotation pin (7) is fixedly inserted in the pin hole (51).

2. The safety valve for preventing spring rotation according to claim 1, characterized in that: The guide sleeve (6) comprises a sleeve (62) and a sleeve disc (63), the recoil disc (3) moves in the sleeve (62), and the sleeve disc (63) is fixed between the valve body (1) and the valve cover (2); an inner edge portion (64) integrally extends inward from the top opening of the sleeve (62), and the sliding holes (61) have two holes that are evenly arranged in the circumferential direction of the inner edge portion (64).

3. The safety valve for preventing spring rotation according to claim 1 or 2, characterized in that: The pin hole (51) is in the shape of a blind hole and is formed from bottom to top. The pin hole (51) and the sliding hole (61) are located opposite each other, and the anti-rotation pin (7) is tightly fitted with the pin hole (51).

4. The safety valve for preventing spring rotation according to claim 1 or 2, characterized in that: A sealing ring (65) is installed in the gap between the recoil disc (3) and the guide sleeve (6).

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