Impact-free swing check valve

Abstract

According to the technical scheme, the impact-free swing check valve is characterized in that the impact-free swing check valve comprises a valve body, a rocker which is located in the valve body and can rotate relative to the valve body, a valve seat located in the valve body and a valve clack which is fixedly connected with the rocker and can be sealed on the valve seat; the face, facing the valve seat, of the valve clack is elastically connected with a plurality of buffer blocks which are coaxial with the valve clack and distributed in a circumferential mode, the diameter of the circumference where the buffer blocks are located is larger than the outer diameter of the annular sealing face of the valve clack, and the outer wall of the valve seat is provided with a buffer annular groove for the buffer blocks to enter and abut against. The multiple buffer blocks abut against the buffer ring groove firstly, so that the attaching action of the valve clack and the valve seat tends to be gentle, and the problem that in the prior art, the valve seat and the valve clack are prone to being damaged by collision, and leakage is caused is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, and more specifically to a non-impact swing check valve. Background Art

[0002] The swing check valve is the most commonly used check valve, which is mainly used to prevent the backflow of the medium in the pipeline. The swing check valve in the prior art cannot control the speed when opening and closing, has a large impact, and is prone to water hammer and noise, making the valve work unstable and unreliable.

[0003] At present, a Chinese patent with announcement number CN219866428U discloses a swing check valve with an anti-impact effect. The valve disc is elastically connected with a buffer ring plate and a sealing ring that can fit with the valve seat is fixedly connected to the buffer ring plate so that the impact force generated when the valve seat and the sealing ring contact can be mitigated, and the impact force generated by the valve disc on the valve seat is reduced to a certain extent. However, there are still defects. The buffering effect of the spring starts at the moment when the sealing ring contacts the valve seat. The impact force of the sealing ring as the valve disc swings down is large, and the buffering force generated by the spring is small and cannot effectively mitigate the buffering impact force of the sealing ring. The knocks between the valve seat and the sealing ring are inevitable and serious, and the sealing surfaces of the sealing ring and the valve seat are easily damaged, which affects the sealing performance. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide an impact-free swing check valve which can effectively reduce impact force and has stable sealing.

[0005] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a non-impact swing check valve, comprising a valve body, a rocker located in the valve body and capable of rotating relative to the valve body, a valve seat positioned in the valve body and a valve disc fixedly connected to the rocker and capable of forming a seal with the valve seat, a plurality of buffer blocks coaxial with the valve disc and circumferentially distributed are elastically connected to the surface of the valve disc facing the valve seat, the diameter of the circle where the plurality of buffer blocks are located is larger than the outer diameter of the annular sealing surface of the valve disc, a buffer ring groove for the plurality of buffer blocks to enter and contact is provided on the outer wall of the valve seat, and the plurality of buffer blocks first contact the buffer ring groove to ease the fitting action of the valve disc and the valve seat.

[0006] As a further improvement of the utility model, a valve flap cover is arranged outside the valve flap, a limiting ring groove is arranged on the inner wall of the valve flap cover, and multiple buffer blocks are provided with guide pins which are limitedly positioned in the limiting ring groove and can move along the length direction of the limiting ring groove.

[0007] The beneficial effects of the utility model are as follows: multiple buffer blocks first contact the buffer ring groove and the fitting action of the valve disc and the valve seat is relaxed under the action of elastic force. Compared with the prior art, such a design can utilize the buffer block to contact the buffer ring groove before the sealing surfaces of the valve disc and the valve seat contact to force the spring to generate elastic force, and can give the spring a longer force storage time to generate a greater elastic force, which effectively buffers the valve disc in terms of time and strength, and reduces the impact force generated when the valve disc swings down to a greater extent. The action of the valve disc and the valve seat fitting each other tends to be relaxed, which greatly reduces the degree of damage between the valve seat and the valve disc, effectively ensuring the stability of the sealing surface structure of the valve disc and the valve seat, thereby improving the stability of the seal between the valve disc and the valve seat. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 It is the front view of the utility model;

[0009] Figure 2 This is a partial state diagram of the valve cover and valve seat in the utility model when they are fitted together;

[0010] Figure 3 for Figure 2 Enlarged view of point A in the middle.

[0011] Figure numerals: 1, valve body; 2, rocker; 3, valve seat; 4, valve disc; 5, buffer block; 6, buffer ring groove; 7, valve disc cover; 8, limit ring groove; 9, guide pin. DETAILED DESCRIPTION

[0012] 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.

[0013] Reference Figures 1 to 3 As shown, a non-impact swing check valve of this embodiment comprises a valve body 1, a rocker 2 located in the valve body 1 and capable of rotating relative to the valve body 1, a valve seat 3 positioned in the valve body 1, and a valve flap 4 fixedly connected to the rocker 2 and capable of forming a seal with the valve seat 3;

[0014] Based on the above-mentioned prior art, a plurality of spring grooves coaxial with the valve disc 4 and distributed circumferentially are processed on the surface of the valve disc 4 that can fit with the valve seat 3, the circumferential diameter of the plurality of spring grooves is larger than the outer diameter of the annular sealing surface of the valve disc 4, and a spring whose length direction is parallel to the axis of the valve disc 4 is installed in the plurality of spring grooves, one end of the spring can be fixedly connected to the groove bottom of the spring groove by welding or bonding, and the other end of the spring extends out of the spring groove, and a plurality of buffer blocks 5 are welded to one end of the plurality of springs in sequence, and a buffer ring groove 6 coaxial with the valve seat 3 is processed on the outer wall of the valve seat 3, and one end of the buffer ring groove 6 opens and extends to the surface of the valve seat 3 that can fit with the valve disc 4;

[0015] In the initial state, the sealing surfaces of the valve disc 4 and the valve seat 3 fit together to form a hard seal, and the multiple buffer blocks 5 are all located in the buffer ring groove 6 and touch the bottom of the buffer ring groove 6, and the multiple springs are all in a compressed state. When the valve disc 4 is pushed and opened by the medium, the valve disc 4 quickly opens under the thrust of the medium and the elastic force of the spring, and the spring gradually returns to a natural stretched state, and the buffer block 5 separates from the bottom of the buffer ring groove 6 and moves out of the buffer ring groove 6. When the thrust of the medium cannot push the valve disc 4, the valve disc 4 swings toward the valve seat 3 under the action of gravity, and the multiple buffer blocks 5 enter the buffer ring groove 6 first compared to the valve disc 4 and touch the bottom of the buffer ring groove 6. As the valve disc 4 continues to approach the valve seat 3, the multiple springs are compressed and generate thrust on the valve disc 4, thereby slowing down the speed at which the valve disc 4 approaches the valve seat 3, until the valve disc 4 gently covers the valve seat 3, and the multiple springs are deformed into place;

[0016] Compared with the prior art, such a design can use the buffer block 5 to contact the buffer ring groove 6 before the sealing surfaces of the valve disc 4 and the valve seat 3 come into contact, thereby forcing the spring to generate elastic force. It can give the spring a longer force storage time and generate a greater elastic force, and effectively buffer the valve disc 4 in terms of time and strength, and reduce the impact force generated when the valve disc 4 swings down to a greater extent. The movement of the valve disc 4 and the valve seat 3 fitting each other tends to be gentle, which greatly reduces the degree of damage between the valve seat 3 and the valve disc 4, and effectively ensures the stability of the sealing surface structure of the valve disc 4 and the valve seat 3, thereby improving the stability of the seal between the valve disc 4 and the valve seat 3.

[0017] As a specific embodiment of the improvement, the buffer block 5 will move along the diameter direction of the valve disc 4 under the impact of the medium, resulting in the spring bending and easy damage, resulting in the buffering effect of the valve disc 4 being deteriorated, and the valve disc 4 exerting a greater impact force on the valve seat 3. In order to solve the above-mentioned problem, refer to Figures 1 to 3 As shown, a valve flap cover 7 is provided outside the valve flap 4. The valve flap cover 7 is split, that is, the valve flap cover 7 is composed of two identical half covers. The peripheral wall of the valve flap 4 and the surface connected to the rocker 2 are covered in the valve flap cover 7. A hole is provided in the center of the valve flap cover 7 to facilitate the fixed connection between the rocker 2 and the valve flap 4. The valve flap cover 7 is sleeved on the inner wall outside the peripheral wall of the valve flap 4 and is processed with a limiting ring groove 8 coaxial with the valve flap 4. A guide pin 9 is integrally formed on one side of the plurality of buffer blocks 5. The guide pin 9 is L-shaped and partially located outside the peripheral wall of the valve flap 4.

[0018] During the installation process, the two half covers are moved toward each other along the diameter direction of the valve disc 4 until the inner walls of the two half covers are in contact with the peripheral wall of the valve disc 4 and the plurality of guide pins 9 are all located in the limiting ring groove 8, and the guide pins 9 are then limited between the peripheral wall of the valve disc 4 and the bottom of the limiting ring groove 8. Subsequently, bolts are successively passed through the half covers and screwed into the valve disc 4 so that the two half covers are positioned on the valve disc 4, and the two half covers together form a valve disc cover 7;

[0019] In the initial state, the valve disc 4 is away from the valve seat 3, and the buffer block 5 is pushed by the spring, and the guide pins 9 are all outlined on the groove wall of the limiting ring groove 8 away from the valve disc 4. In the process of the valve disc 4 and the valve seat 3 being refitted, the buffer block 5 touches the buffer ring groove 6, and the guide pins 9 move along the length direction of the limiting ring groove 8. The spring is compressed until the valve disc 4 and the valve seat 3 are in place, and the guide pins 9 stop moving in the limiting ring groove 8.

[0020] Such a design can ensure that the moving path of the buffer block 5 is straight, while improving the state stability of the buffer block 5, avoiding the buffer block 5 from deflecting under the impact of the medium, indirectly improving the structural stability of the spring, and extending the service life of the spring.

[0021] 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. A non-impact swing check valve, comprising a valve body (1), a rocker (2) located in the valve body (1) and capable of rotating relative to the valve body (1), a valve seat (3) positioned in the valve body (1), and a valve flap (4) fixedly connected to the rocker (2) and capable of forming a seal with the valve seat (3), characterized in that: A plurality of buffer blocks (5) coaxial with the valve disc (4) and distributed in a circumferential manner are elastically connected to the surface of the valve disc (4) facing the valve seat (3); the diameter of the circumference of the plurality of buffer blocks (5) is greater than the outer diameter of the annular sealing surface of the valve disc (4); and a buffer annular groove (6) for the plurality of buffer blocks (5) to enter and contact is provided on the outer wall of the valve seat (3); and the plurality of buffer blocks (5) first contact the buffer annular groove (6) so that the fitting action of the valve disc (4) and the valve seat (3) is eased.

2. The impact-free swing check valve according to claim 1, characterized in that: A valve flap cover (7) is arranged outside the valve flap (4), a limiting ring groove (8) is arranged on the inner wall of the valve flap cover (7), and a plurality of buffer blocks (5) are each provided with a guide pin (9) which is limitedly positioned in the limiting ring groove (8) and can move along the length direction of the limiting ring groove (8).

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