Safety valve for compressor

Abstract

The utility model discloses a safety valve for a compressor, and belongs to the technical field of safety valves. Comprising a valve body, an adjusting screw sleeve is arranged at one end of the valve body, a valve bonnet is arranged at the end, away from the valve body, of the adjusting screw sleeve, a valve element and a valve rod are arranged in the valve body, and one end of the valve rod is connected with the valve element and the other end of the valve rod penetrates through the adjusting screw sleeve and the valve bonnet. A fixed ring which is fixedly connected and a movable ring which is slidably connected are arranged on the valve rod between the adjusting screw sleeve and the valve bonnet, the movable ring is located on the side, close to the valve bonnet, of the fixed ring, and the fixed ring and the movable ring are connected through a second spring. According to the technical scheme, the impact of frequent opening and closing of the valve element on the valve rod is reduced, the sealing performance of the valve element and the valve seat during working is improved, and leakage of the safety valve is avoided.

Description

Technical Field

[0001] This application relates to the field of safety valve technology, and in particular to a safety valve for a compressor. Background Technology

[0002] A compressor safety valve is a safety device installed in a compressor system. Its main function is to prevent the system pressure from exceeding a predetermined safety value. When the system pressure reaches or exceeds the set pressure, the safety valve will automatically open to release excess gas, thereby reducing the system pressure and preventing equipment damage or accidents due to overpressure.

[0003] Safety valves for existing compressors typically consist of a valve seat, valve core, valve stem, and spring. When the system pressure is lower than the safety valve's set pressure, the spring force presses the valve core against the valve seat, keeping the valve closed. When the system pressure reaches or exceeds the set pressure, the force of the medium acting on the valve core overcomes the spring force, causing the valve core to open and the medium to be discharged rapidly, thus reducing the system pressure. As the system pressure decreases, the spring force presses the valve core back onto the valve seat, closing the valve.

[0004] During long-term use of safety valves for compressors, the frequent opening and closing of the valve core can easily cause deformation of the valve stem. The deformed valve stem cannot remain vertical during movement, resulting in poor alignment between the valve core and the valve seat, which affects the sealing of the contact surface and causes the safety valve to leak. Utility Model Content

[0005] The purpose of this application is to provide a safety valve for a compressor that reduces the impact of frequent opening and closing of the valve core on the valve stem, improves the sealing performance between the valve core and the valve seat during operation, and avoids leakage of the safety valve.

[0006] This application provides a safety valve for a compressor, which adopts the following technical solution: it includes a valve body, one end of which is provided with an adjusting screw sleeve, and the other end of the adjusting screw sleeve away from the valve body is provided with a valve cap. The valve body is provided with a valve core and a valve stem. One end of the valve stem is connected to the valve core, and the other end penetrates the adjusting screw sleeve and the valve cap. A fixed ring and a sliding ring are provided on the valve stem between the adjusting screw sleeve and the valve cap. The sliding ring is located on the side of the fixed ring closer to the valve cap. The fixed ring and the sliding ring are connected by a second spring.

[0007] To prevent valve stem deformation caused by frequent opening and closing of the safety valve during its reciprocating motion, a buffer ring consisting of a fixed ring and a movable ring is installed on the valve stem between the adjusting sleeve and the valve cap. When the valve opens, assuming the original stroke of the valve stem pushed open by the impact is h, the actual stroke reached by the valve stem through the buffer ring is less than h and takes a longer time to reach that actual stroke. This reduces the impact force on the valve stem and the degree of deformation. Therefore, the reciprocating motion of the valve stem can maintain a vertical state for a long time, that is, the alignment of the valve stem with the valve core and valve seat is well maintained, improving the sealing performance of the valve core and valve seat during operation and preventing safety valve leakage.

[0008] Specifically, during the process of the valve stem being pushed open by the valve core during the stroke h, the movable ring first comes into contact with the valve cap, thereby slowing down the upward movement speed of the fixed ring and the valve stem in sequence through the elastic force of the second spring. This makes the actual stroke of the valve stem being pushed open less than h. Furthermore, due to the buffering effect of the buffer ring, the time it takes for the valve stem to rise to the top of the impact is also longer, reducing the deformation caused by the impact on the valve stem.

[0009] In addition, the valve cap installed above the adjusting screw sleeve prevents dust and other impurities from entering the valve body and even the contact surface between the valve core and the valve seat, thus affecting the valve's sealing performance. At the same time, the valve cap also serves as a guide on the outside of the valve stem, ensuring that the valve stem remains vertical during movement and preventing deflection caused by external forces or vibrations.

[0010] Optionally, the retaining ring is fixedly connected to the valve stem via a key connection.

[0011] By adopting the above technical solution, a keyway with one end open downwards is set on the fixing ring. After aligning with the flat key installed on the valve stem, the flat key is slid into the keyway on the fixing ring to fix the fixing ring and the valve stem in place.

[0012] Optionally, a valve seat is integrally provided at the other end of the valve body, and a first spring is also provided in the valve body. The two ends of the first spring abut against the adjusting screw sleeve and the valve stem. The valve stem is pressed against the valve port of the valve seat by the elastic force of the first spring. A vent is provided on the valve body on the valve port side of the valve seat.

[0013] By adopting the above technical solution, the safety valve is installed in the application environment via the external thread at the bottom of the valve body, connecting the valve body cavity to the compressor's air source. When the working air source pressure is lower than the safety valve's set pressure, the force of the first spring presses the valve core onto the valve seat, keeping the valve closed. When the working air source pressure is greater than or equal to the set pressure, the gas pressure overcomes the elastic force of the first spring, impacting the valve core and lifting the valve stem. The valve core no longer seals with the valve seat or valve port, the valve opens, and gas can be quickly released from the vent. As the air source pressure decreases to be equal to or less than the elastic force of the first spring, the valve stem returns to its original position under the elastic restoring force of the first spring, the valve core is pressed down again to seal with the valve seat, and the valve closes. Furthermore, the integrated design of the valve body and valve seat avoids the impact on the alignment of the valve stem, valve core, and valve seat during assembly, as is common in split designs, further improving the safety valve's sealing performance.

[0014] Optionally, a first clearance groove is provided between the valve seat and the valve body, and a first extension portion extending into the first clearance groove is provided on the outer circle of the valve core.

[0015] By adopting the above technical solution, the contact area when the valve core is pressed against the valve seat is increased, and the possibility of safety valve leakage when the valve core is closed is reduced.

[0016] Optionally, a sealing gasket is provided on the inner side of the first extension, and the sealing gasket is pressed onto the valve port of the valve seat by the valve core.

[0017] By adopting the above technical solution, rubber sealing gaskets are added to the valve ports of the valve core and valve seat, further improving the sealing performance of the safety valve.

[0018] Optionally, the sealing gasket has a first protrusion extending toward the valve core in the middle, and the valve core has a first groove that engages with the first protrusion.

[0019] By adopting the above technical solution, the contact area between the sealing gasket and the valve core is increased. At the same time, after assembly and pressing, the air between the valve core and the sealing gasket is squeezed out to form a vacuum zone, which gives the two a certain adsorption effect. During the opening and closing of the valve core, the sealing gasket and the valve core are not easy to separate.

[0020] Optionally, the valve stem has a second protrusion extending toward the valve core at its middle portion, and the valve core has a second groove that engages with the second protrusion.

[0021] Optionally, the outer edge of the valve stem is provided with a first annular groove, and the valve core is provided with a second extension portion extending into the first annular groove.

[0022] By adopting the above technical solution, the contact area between the valve stem and the valve core is increased, making it easier to align them during assembly and operation, and further improving the valve's sealing performance.

[0023] Optionally, the outer edge of the valve stem is provided with a second annular groove, and a bushing is installed in the second annular groove.

[0024] By adopting the above technical solution, the friction between the valve stem and the valve body is reduced, thus avoiding the situation where the valve stem gets stuck when the valve core is opened.

[0025] Optionally, the end face of the adjusting screw sleeve is provided with a first through hole, and the side wall of the valve cap is provided with a second through hole.

[0026] By adopting the above technical solution, when the valve core is opened, the gas that has entered the valve stem section of the valve body cavity from the gap between the valve core and the valve stem can be discharged through the first through hole and the second through hole, thus avoiding backflow in the valve stem section of the valve body cavity from affecting the opening and closing of the valve core.

[0027] In summary, this application includes at least one of the following beneficial technical effects:

[0028] 1. By setting a buffer ring on the valve stem and utilizing the buffering effect of the second spring, the impact speed of the valve stem is reduced, the stroke of the valve stem being pushed up by the impact is shortened, the degree of deformation of the valve stem is effectively reduced, and the valve stem is kept in vertical motion. This avoids misalignment between the valve core and the valve seat, thereby extending the service life of the valve stem and reducing the frequency of maintenance.

[0029] 2. The design incorporates features such as sealing gaskets, convex and groove fits, and annular groove fits and extensions to increase the contact area and sealing performance between the valve core and valve seat. At the same time, the bushing reduces the friction between the valve stem and valve body, ensuring smooth opening and closing of the valve core. The integrated design of the valve body and valve seat improves the alignment of the valve stem, valve core, and valve seat. These structural designs significantly improve the sealing performance of the safety valve and effectively prevent leakage. Attached Figure Description

[0030] Figure 1 This is a cross-sectional view of the overall structure of a safety valve for a compressor.

[0031] Figure 2 yes Figure 1 A magnified view of part a;

[0032] Figure 3 yes Figure 1 A magnified view of part b;

[0033] Figure 4 yes Figure 1 A magnified view of part c.

[0034] Explanation of reference numerals in the attached drawings: 1. Valve body; 11. First movable chamber; 2. Valve seat; 21. First clearance groove; 3. Adjusting screw sleeve; 31. First through hole; 4. Valve core; 41. First extension; 42. First groove; 43. Second groove; 44. Second extension; 5. Valve stem; 51. Second protrusion; 52. First annular groove; 53. Second annular groove; 54. Bushing; 6. First spring; 7. Vent port; 8. Valve cap; 81. Second movable chamber; 82. Second through hole; 9. Buffer ring; 91. Fixed ring; 92. Movable ring; 93. Second spring; 94. Keyway; 10. Sealing gasket; 101. First protrusion. Detailed Implementation

[0035] The following is in conjunction with the appendix Figure 1 -Appendix Figure 4 This application will be described in further detail.

[0036] This application discloses a safety valve for a compressor.

[0037] Combination Figure 1 As shown, a safety valve for a compressor includes a valve body 1. The inner cavity of the valve body 1 is a first movable chamber 11. Within the first movable chamber 11, a valve seat 2, a valve core 4, a valve stem 5, a first spring 6, and an adjusting sleeve 3 are sequentially arranged. The two ends of the first spring 6 abut against the adjusting sleeve 3 and the valve stem 5. The valve stem 5, under the elastic force of the first spring 6, presses the valve core 4 onto the valve port of the valve seat 2. A vent port 7 is provided on one side of the valve seat 2 valve port. The valve body 1 is installed in the application environment via the external thread at the lower part of the valve body 1, connecting the first movable chamber 11 of the valve body 1 to the air source of the compressor. The opening pressure of the safety valve is adjusted to the set pressure by tightening the adjusting sleeve 3. When the working air source pressure is lower than the set pressure of the safety valve, the force of the first spring 6 presses the valve core 4 onto the valve seat 2, keeping the valve closed.

[0038] When the gas pressure of the working gas source is greater than or equal to the set pressure, the gas pressure overcomes the elastic force of the first spring 6, impacts the valve core 4, and pushes the valve stem 5 open. The valve core 4 is no longer in sealing contact with the valve port of the valve seat 2, the valve opens, and the gas is quickly released from the vent 7. The gas pressure of the gas source decreases until it is less than the set pressure. Under the action of the elastic restoring force of the first spring 6, the valve stem 5 returns to its original position, the valve core 4 is pressed down again to seal with the valve seat 2, and the valve closes.

[0039] like Figure 1 , Figure 4As shown, the adjusting screw sleeve 3 has a valve cap 8 at the end away from the valve seat 2. The valve stem 5 passes through the second movable cavity 81 formed between the adjusting screw sleeve 3 and the valve cap 8. A buffer ring 9 is provided on the valve stem 5 in the second movable cavity 81 to reduce the impact force on the valve stem 5 during lifting and lowering. The buffer ring 9 includes a fixed ring 91 fixedly connected to the valve stem 5 and a movable ring 92 slidably connected to the valve stem 5. The movable ring 92 is located on the side of the fixed ring 91 closer to the valve cap 8. The fixed ring 91 and the movable ring 92 are connected by a second spring 93.

[0040] During the reciprocating motion of the valve stem 5, a buffer ring 9 is installed in the second movable chamber 81 to prevent deformation of the valve stem 5 caused by frequent opening and closing impacts during the use of the safety valve. Assuming that when the valve is opened, the original stroke of the valve stem 5, which is pushed open by the impact, is h, the actual stroke reached by the valve stem 5 through the action of the buffer ring 9 is less than h and takes a longer time to reach that actual stroke. This reduces the impact force on the valve stem 5 and the degree of deformation. Therefore, the reciprocating motion of the valve stem 5 can maintain a vertical state for a long time, that is, the alignment of the valve stem 5 with the valve core 4 and the valve seat 2 is well maintained, which improves the sealing performance of the valve core 4 and the valve seat 2 during operation and avoids leakage of the safety valve.

[0041] Specifically, during the process of the valve stem 5 being pushed open by the valve core 4, the movable ring 92 first abuts against the valve cap 8, thereby the elastic force of the second spring 93 successively slows down the upward movement speed of the fixed ring 91 and the valve stem 5, so that the actual stroke of the valve stem 5 being pushed open is less than h. Moreover, due to the buffering effect of the buffer ring 9, the time for the valve stem 5 to rise to the top of the impact is also longer, thus reducing the overall deformation caused by the impact on the valve stem 5.

[0042] It is worth noting that when the opening pressure of the safety valve is adjusted to the set pressure, the valve is in a closed state. At this time, there is a certain gap h1 between the moving ring 92 and the valve cap 8, indicating that the moving ring 92 does not abut against the valve cap 8, and therefore will not transmit additional pressure to the valve stem 5, preventing the actual opening pressure of the valve from exceeding the adjusted set pressure. At the same time, this gap h1 should not be too large; it must be less than the stroke h of the valve stem 5 when it is pushed open by the valve core 4. Otherwise, it will not effectively buffer the valve stem 5.

[0043] like Figure 4 As shown, the keyway 94 on the retaining ring 91 is designed with one end open downwards. A flat key is installed on the valve stem 5. After aligning the keyway 94 with the flat key, the retaining ring 91 is put on the valve stem 5 from top to bottom to complete the assembly of the retaining ring 91 and the valve stem 5.

[0044] like Figure 2As shown, an annular first relief groove 21 is provided between the valve seat 2 and the valve body 1. The outer circle of the valve core 4 is provided with a first extension 41 extending into the first relief groove 21. When the valve core 4 is pressed to the valve port of the valve seat 2, the protruding first extension 41 wraps around the valve seat 2, which further increases the contact area between the valve core 4 and the valve seat 2 and also improves the sealing performance of the valve.

[0045] like Figure 1 , 3 As shown, a rubber sealing gasket 10 is added to the valve port of the valve core 4 and valve seat 2, and a first protrusion 101 extending towards the valve core 4 is provided in the middle of the sealing gasket 10. The valve core 4 is provided with a first groove 42 that engages with the first protrusion 101. In this embodiment, both the valve core 4 and the valve seat 2 are made of HPb59-1 leaded brass alloy. Adding a rubber sealing gasket 10 between them improves the sealing performance of the safety valve. The structure of the first protrusion 101 and the first groove 42 helps to prevent the sealing gasket 10 from detaching from the valve core 4, allowing the safety valve to open and close smoothly and improving the sealing performance of the safety valve.

[0046] like Figure 1 , 3 As shown, a second protrusion 51 extending towards the valve core 4 is provided in the middle of the valve stem 5, and a second groove 43 is provided in the valve core 4 to engage with the second protrusion 51. A first annular groove 52 is provided on the outer edge of the valve stem 5, and a second extension 44 extending towards the first annular groove 52 is provided in the valve core 4. These features increase the contact area between the valve stem 5 and the valve core 4, making them easier to align during assembly and operation, and further improving the valve's sealing performance.

[0047] like Figure 1 As shown, in order to make the valve stem 5 move back and forth more smoothly in the valve body 1, a second annular groove 53 is provided on the outer edge of the valve stem 5, and a bushing 54 is installed in the second annular groove 53 to reduce the friction between the valve stem 5 and the valve body 1 and prevent the valve stem 5 from getting stuck.

[0048] like Figure 1 As shown, the end face of the adjusting screw sleeve 3 is provided with a first through hole 31, and the side wall of the valve cap 8 is provided with a second through hole 82. This allows gas that enters the valve stem 5 section of the first movable chamber 11 from the gap between the valve body 1 and the valve core 4, and between the valve body 1 and the valve stem 5, when the valve core 4 is opened, to be discharged through the first through hole 31 and the second through hole 82, thus preventing backflow from affecting the opening and closing of the valve core 4 in the valve stem 5 section of the first movable chamber 11.

[0049] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A safety valve for a compressor, characterized in that: The valve includes a valve body (1), one end of which is provided with an adjusting screw sleeve (3), and the end of the adjusting screw sleeve (3) away from the valve body (1) is provided with a valve cap (8). The valve body (1) is provided with a valve core (4) and a valve stem (5). One end of the valve stem (5) is connected to the valve core (4), and the other end passes through the adjusting screw sleeve (3) and the valve cap (8). A fixed ring (91) and a sliding ring (92) are provided on the valve stem (5) between the adjusting screw sleeve (3) and the valve cap (8). The sliding ring (92) is located on the side of the fixed ring (91) closer to the valve cap (8). The fixed ring (91) and the sliding ring (92) are connected by a second spring (93).

2. A safety valve for a compressor according to claim 1, characterized in that: The retaining ring (91) is fixedly connected to the valve stem (5) by a key connection.

3. A safety valve for a compressor according to claim 1, characterized in that: The valve body (1) is integrally provided with a valve seat (2) at the other end. The valve body (1) is also provided with a first spring (6). The two ends of the first spring (6) abut against the adjusting screw sleeve (3) and the valve stem (5). The valve stem (5) is pressed by the elastic force of the first spring (6) onto the valve port of the valve seat (2). The valve body (1) on the valve port side of the valve seat (2) is provided with a vent (7).

4. A safety valve for a compressor according to claim 3, characterized in that: A first clearance groove (21) is provided between the valve seat (2) and the valve body (1), and a first extension (41) extending into the first clearance groove (21) is provided on the outer circle of the valve core (4).

5. A safety valve for a compressor according to claim 4, characterized in that: The inner side of the first extension (41) is provided with a sealing gasket (10), which is pressed by the valve core (4) onto the valve port of the valve seat (2).

6. A safety valve for a compressor according to claim 5, characterized in that: The sealing gasket (10) has a first protrusion (101) extending toward the valve core (4) in the middle, and the valve core (4) has a first groove (42) that is inserted and engaged with the first protrusion (101).

7. A safety valve for a compressor according to claim 1, characterized in that: The valve stem (5) has a second protrusion (51) extending toward the valve core (4) at its middle part, and the valve core (4) has a second groove (43) that is inserted and engaged with the second protrusion (51).

8. A safety valve for a compressor according to claim 7, characterized in that: The valve stem (5) has a first annular groove (52) on its outer edge, and the valve core (4) has a second extension (44) extending into the first annular groove (52).

9. A safety valve for a compressor according to claim 1, characterized in that: The valve stem (5) has a second annular groove (53) on its outer edge, and a bushing (54) is installed in the second annular groove (53).

10. A safety valve for a compressor according to claim 1, characterized in that: The end face of the adjusting screw sleeve (3) is provided with a first through hole (31), and the side wall of the valve cap (8) is provided with a second through hole (82).

Images