Anti-scouring safety valve

Abstract

According to the technical scheme, the anti-scour safety valve is characterized by comprising a valve body, a valve seat located in the valve body, a valve clack capable of forming hard sealing on the valve seat and a valve rod connected with the valve clack and elastically connected with the valve body, and a buffering ring capable of abutting against the valve clack and a buffering spring pushing the buffering ring to the valve clack are arranged in an inner cavity of the valve seat. A plurality of throttling grooves which are circumferentially distributed around the axis of the buffering ring are formed in the annular face, facing the valve clack, of the buffering ring, the length direction of the multiple throttling grooves is the same as the diameter direction of the buffering ring, and the valve clack abuts against the buffering ring so that a medium can sequentially flow through the throttling grooves and a gap between the valve seat and the valve clack; the problem that in the prior art, sealing faces of a valve clack and a valve seat are prone to abrasion is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of safety valves, and more particularly to an anti-scouring safety valve. Background Art

[0002] Safety valves are widely used in various fields such as petroleum, chemical industry, power stations, metallurgy, nuclear power, and national defense. When the pressure in the protected system exceeds the set pressure of the safety valve, the safety valve opens to relieve the pressure in the system to prevent the pressure in the system from continuing to rise and damaging the system. When the pressure in the system decreases, the safety valve returns to its seat to prevent the medium in the system from continuing to be discharged and wasting energy.

[0003] The existing safety valve includes a valve body, a valve disc located in the valve body, a valve stem elastically connected to the valve body and the valve disc, a guide sleeve sleeved outside the valve disc and a valve seat that can touch the valve disc. The sealing surfaces of the valve disc and the valve seat fit each other to form a hard seal. During the process of opening or closing the valve disc relative to the valve seat, the gap between the valve disc and the valve seat is small, and the medium flow rate is fast, which easily generates a large scouring force on the sealing surfaces of the valve disc and the valve seat, causing the wear of the sealing surfaces of the valve disc and the valve seat to accelerate, resulting in poor sealing effect between the valve disc and the valve seat and causing leakage; furthermore, the valve disc will generate a large impact force when it approaches the valve seat under the action of elastic force, causing the valve disc to collide with the valve seat and aggravate the damage of the sealing surface. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model aims to provide a safety valve which can slow down the scouring of the medium and has stable structures of both the valve disc and the valve seat.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: an anti-scouring safety valve, comprising a valve body, a valve seat positioned in the valve body, a valve disc capable of forming a hard seal with the valve seat, and a valve stem connected to the valve disc and elastically connected to the valve body, a buffer ring capable of contacting the valve disc and a buffer spring for pushing the buffer ring toward the valve disc are arranged in the inner cavity of the valve seat, a plurality of throttling grooves circumferentially distributed around the axis of the buffer ring are arranged on the annular surface of the buffer ring facing the valve disc, the length direction of the plurality of throttling grooves is the same as the diameter direction of the buffer ring, and the medium flows through the throttling groove and the gap between the valve seat and the valve disc in turn through the contact between the valve disc and the buffer ring.

[0006] As a further improvement of the utility model, a buffer groove for the buffer ring to extend into is arranged on the surface of the valve disc facing the valve seat, the inner cavity of the buffer groove is truncated cone-shaped with the large end facing the valve seat, and the valve seat is provided with a throttling ring that can extend into the buffer groove, and the outer wall of the throttling ring is parallel to the groove wall of the buffer groove. When the valve disc and the valve seat form a hard seal, there is a gap between the throttling ring and the buffer groove, and the height at which the end face of the buffer ring and the valve disc touches is greater than the height at which the surface of the throttling ring facing the valve disc is located.

[0007] As a further improvement of the utility model, the cross-section of the plurality of throttling grooves in the diameter direction of the buffer ring is semicircular.

[0008] As a further improvement of the utility model, a limiting hole extending along the thickness direction of the buffer ring is arranged on the inner wall of the buffer ring, and a limiting piece penetrating the limiting hole is arranged on the inner wall of the valve seat.

[0009] The beneficial effects of the utility model are as follows: the medium flows through the throttling groove and the gap between the valve seat and the valve disc in turn through the contact between the valve disc and the buffer ring. Compared with the prior art, such a design can produce a throttling effect on the medium through the throttling groove, thereby reducing the amount of medium flowing through the valve seat and the valve disc, and reducing the scouring force generated by the medium in the process of the valve disc opening or closing relative to the valve seat, effectively ensuring the structural stability of the sealing surfaces of the valve seat and the valve disc, and indirectly ensuring the sealing between the valve seat and the valve disc; the buffer ring first contacts the valve disc and uses the elastic force generated by the buffer spring to effectively reduce the impact force generated by the downward movement of the valve disc, thereby slowing down the collision between the valve disc and the valve seat, and further improving the structural stability of the sealing surfaces of the valve seat and the valve disc. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] Figure 1 It is the main sectional view of the utility model;

[0011] Figure 2 for Figure 1 The enlarged view of point A in the middle;

[0012] Figure 3 This is a main cross-sectional view of another embodiment of the utility model;

[0013] Figure 4 for Figure 3 The enlarged view of point B in the middle;

[0014] Figure 5 It is a stereoscopic diagram of the buffer ring in the utility model.

[0015] Figure numerals: 1. valve body; 2. valve seat; 3. valve disc; 4. valve stem; 5. buffer ring; 6. buffer spring; 7. throttle groove; 8. buffer groove; 9. throttle ring; 10. limiting hole; 11. limiting member. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings and embodiments, wherein the same components are indicated by the same reference numerals.

[0017] Reference Figures 1 to 5As shown, an anti-scouring safety valve of this embodiment comprises a valve body 1, a valve seat 2 positioned in the valve body 1, a valve flap 3 capable of forming a hard seal with the valve seat 2, and a valve stem 4 connected to the valve flap 3 and elastically connected to the valve body 1, wherein a downward pressure spring is disposed on the outer sleeve of the valve stem 4;

[0018] Based on the above-mentioned prior art, a mounting groove coaxial with the valve seat 2 is processed on the inner wall of the valve seat 2, the outer diameter of the buffer ring 5 is matched with the inner diameter of the mounting groove, and the inner diameter of the buffer ring 5 is larger than the diameter of the opening at the bottom of the mounting groove. A plurality of throttling grooves 7 are processed on one of the end faces of the buffer ring 5, and the plurality of throttling grooves 7 are distributed in a circle around the axis of the buffer ring 5, and the length direction of the throttling grooves 7 is the same as the diameter direction of the buffer ring 5. The outer diameter of the buffer spring 6 is matched with the inner diameter of the mounting groove, and the inner diameter of the buffer spring 6 is larger than the diameter of the opening at the bottom of the mounting groove. The elastic coefficient of the buffer spring 6 is smaller than the elastic coefficient of the downward pressing spring, so as to ensure that the valve disc 3 can be stably pressed on the valve seat 2. During the installation process, one end of the buffer spring 6 is welded to the end face of the buffer ring 5 which is not processed with the throttling groove 7, and then the buffer spring 6 and the buffer ring 5 are integrally installed in the mounting groove and the other end of the buffer spring 6 is welded to the groove bottom of the mounting groove.

[0019] In the initial state, the valve disc 3 fits with the valve seat 2, the end surface of the buffer ring 5 with the throttling groove 7 fits with the valve disc 3, and the buffer spring 6 is in a compressed state. In the process of the medium pushing the valve disc 3 upward, the valve disc 3 is initially separated from the valve seat 2, and the buffer ring 5 moves upward with the valve disc 3 under the combined action of the elastic force of the buffer spring 6 and the upward driving force of the medium. The medium first flows through multiple throttling grooves 7 and then flows through the gap formed between the valve disc 3 and the valve seat 2. As the valve disc 3 continues to move upward, the valve disc 3 and the valve seat 2 are The distance between the seats 2 becomes larger, the buffer ring 5 is separated from the valve disc 3, and the medium can flow freely. At this time, one end of the buffer ring 5 is at a position higher than the sealing surface of the valve seat 2. When the medium pressure decreases and the valve disc 3 moves downward, the valve disc 3 first touches the buffer ring 5, and the medium can only flow through the throttling groove 7 and then flow through the gap between the valve disc 3 and the valve seat 2. As the valve disc 3 continues to move downward, the buffer spring 6 is compressed, and the buffer ring 5 moves downward synchronously with the valve disc 3 until the sealing surfaces of the valve disc 3 and the valve seat 2 are tightly attached.

[0020] Compared with the prior art, such a design can produce a throttling effect on the medium through the throttling groove 7, thereby reducing the amount of medium flowing through the valve seat 2 and the valve disc 3, and reducing the scouring force generated by the medium during the opening or closing of the valve disc 3 relative to the valve seat 2, thereby effectively ensuring the structural stability of the sealing surfaces of the valve seat 2 and the valve disc 3, and indirectly ensuring the sealing between the valve seat 2 and the valve disc 3; the buffer ring 5 first contacts the valve disc 3 and uses the elastic force generated by the buffer spring 6 to effectively reduce the impact force generated by the downward movement of the valve disc 3, thereby slowing down the collision between the valve disc 3 and the valve seat 2, and further improving the structural stability of the sealing surfaces of the valve seat 2 and the valve disc 3.

[0021] As a specific implementation method of the improvement, refer to Figure 4 As shown, a buffer groove 8 with a truncated cone-shaped inner cavity is processed on the surface of the valve disc 3 facing the valve seat 2, the buffer groove 8 is coaxially arranged with the valve disc 3, and the end with a larger inner diameter of the buffer groove 8 faces the valve seat 2. A throttling ring 9 coaxial with the valve seat 2 is processed on the end surface of the valve seat 2 facing the valve disc 3, the space enclosed by the outer peripheral wall of the throttling ring 9 is truncated cone-shaped and the small end faces the valve disc 3, and the outer peripheral wall of the throttling ring 9 is parallel to the groove wall of the buffer groove 8;

[0022] In the initial state, the valve disc 3 is separated from the buffer ring 5 and the medium is in a flow state. When the medium pressure decreases and the valve disc 3 moves downward, the buffer ring 5 touches the valve disc 3 and moves downward synchronously with the valve disc 3. After the medium flows through the throttling groove 7, the medium changes its flow direction at the groove wall of the buffer groove 8 and then flows through the gap between the valve disc 3 and the valve seat 2. As the valve disc 3 continues to move downward, the throttling ring 9 gradually enters the buffer groove 8, and a buffer flow channel is formed between the outer wall of the throttling ring 9 and the groove wall of the buffer groove 8. The medium flows through the throttling groove 7, the buffer flow channel and the gap between the valve disc 3 and the valve seat 2 in turn, until the sealing surfaces of the valve disc 3 and the valve seat 2 fit each other, the valve disc 3 moves downward into place, and the height of the end face where the buffer ring 5 fits the valve disc 3 is greater than the height of the face of the throttling ring 9 facing the valve disc 3.

[0023] Compared with the previous embodiment, this design further increases the trajectory of the medium flowing through the valve disc 3 and the valve seat 2. Multiple changes in the flow direction and flow velocity of the medium can effectively reduce the scouring force of the medium on the sealing surfaces of the valve seat 2 and the valve disc 3, further ensuring the structural stability of the sealing surfaces of the valve seat 2 and the valve disc 3, indirectly improving the sealing between the valve disc 3 and the valve seat 2 and extending the service life of the valve disc 3 and the valve seat 2.

[0024] As a specific implementation method of the improvement, refer to Figure 5 As shown, the cross-section of the plurality of throttling grooves 7 in the diameter direction of the buffer ring 5 is semicircular. Compared with the design in which the inner cavity of the throttling groove 7 is made into a rectangular shape, such a design can further improve the throttling effect and reduce the scouring force of the medium.

[0025] As a specific implementation of the improvement, when the medium generates a large driving force on the buffer ring 5, the buffer spring 6 will be overstretched and damaged. To solve the above problem, refer to Figure 2 and Figure 4As shown, a threaded hole is processed on the inner wall of the valve seat 2, and a limiting hole 10 is processed on the peripheral wall of the buffer ring 5. The length direction of the limiting hole 10 is the same as the thickness direction of the buffer ring 5. The limiting member 11 can be a bolt. After the buffer ring 5 is installed in place in the valve seat 2, the limiting hole 10 corresponds to the threaded hole. The bolt is passed through the limiting hole 10 and screwed into the threaded hole so that the buffer ring 5 is limited in the valve seat 2. During the up and down movement of the buffer ring 5, the limiting member 11 moves along the length direction of the limiting hole 10. Such a design can prevent the buffer ring 5 from being driven by the medium through the contact between the limiting member 11 and one end of the limiting hole 10, thereby indirectly ensuring the structural stability of the buffer spring 6. At the same time, the limiting member 11 moves linearly along the limiting hole 10 and can also provide a guiding effect for the movement of the buffer ring 5.

[0026] The above is only a preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions under the concept of the present invention belong to the protection scope of the present invention. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. An anti-scouring safety valve, comprising a valve body (1), a valve seat (2) positioned in the valve body (1), a valve flap (3) capable of forming a hard seal with the valve seat (2), and a valve stem (4) connected to the valve flap (3) and elastically connected to the valve body (1), characterized in that: A buffer ring (5) capable of contacting the valve disc (3) and a buffer spring (6) for pushing the buffer ring (5) toward the valve disc (3) are arranged in the inner cavity of the valve seat (2); a plurality of throttling grooves (7) distributed in a circumferential manner around the axis of the buffer ring (5) are arranged on the annular surface of the buffer ring (5) facing the valve disc (3); the length direction of the plurality of throttling grooves (7) is the same as the diameter direction of the buffer ring (5); and the valve disc (3) and the buffer ring (5) contact each other so that the medium flows through the throttling grooves (7) and the gap between the valve seat (2) and the valve disc (3) in sequence.

2. The anti-scouring safety valve according to claim 1, characterized in that: A buffer groove (8) for the buffer ring (5) to extend into is provided on the surface of the valve disc (3) facing the valve seat (2), the inner cavity of the buffer groove (8) is truncated cone-shaped with the large end facing the valve seat (2), and the valve seat (2) is provided with a throttling ring (9) capable of extending into the buffer groove (8), the outer wall of the throttling ring (9) is parallel to the groove wall of the buffer groove (8), when the valve disc (3) and the valve seat (2) form a hard seal, there is a gap between the throttling ring (9) and the buffer groove (8), and the height at which the end surface of the buffer ring (5) and the valve disc (3) are in contact is greater than the height at which the surface of the throttling ring (9) facing the valve disc (3) is located.

3. An anti-scouring safety valve according to claim 1 or 2, characterized in that: The cross-section of the plurality of throttling grooves (7) in the diameter direction of the buffer ring (5) is semicircular.

4. An anti-scouring safety valve according to claim 1 or 2, characterized in that: The inner wall of the buffer ring (5) is provided with a limiting hole (10) extending in the thickness direction of the buffer ring (5), and the inner wall of the valve seat (2) is provided with a limiting member (11) penetrating the limiting hole (10).

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