Containment isolation check valve

Abstract

The present application relates to the technical field of valve, in particular to a containment isolation check valve, comprising a first valve body, a valve disc and a support seat. The first valve body has a first flow passage and a first valve cavity. The valve disc has a first state of connecting the first flow passage and the first valve cavity under the push of the medium and a second state of blocking the connection of the two; the support seat is arranged in the first valve cavity and sequentially has a guide matching part and a backflow drainage part along the flow direction of the medium, the guide matching part is matched with the valve disc and is suitable for guiding the valve disc to move along the first valve body axis; the backflow drainage part has a cavity suitable for collecting backflow medium to push the valve disc to seat until blocking the first flow passage. The present application can improve the valve disc seating force and the stability of the valve disc seating, push the valve disc to seat until blocking the first flow passage, effectively prevent the medium from flowing backward, and improve the sealing performance. Moreover, it can meet the operation requirements under the condition of small flow and meet the sealing requirements under the condition of stable seating.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve, in particular to a containment isolation check valve. BACKGROUND

[0002] The nuclear power containment isolation check valve is a check valve with high requirements and high performance. The check valve has very high requirements for seat stability and sealing performance. In the application of check valves in this field, there is a special working condition with very small flow. Under this very small flow, existing domestic and foreign check valves are difficult to open or unstable after opening, and the situation of back and forth oscillation occurs, which does not meet the operation requirements. When the reverse flow occurs, the valve disc is unstable in seat or unstable in sealing performance after seat, which does not meet the sealing leakage rate requirements.

[0003] Therefore, in order to provide better protection for the safe operation of nuclear power, and to fill the gap in this field at home and abroad, it is urgent to design a check valve that can normally open to meet the operation requirements and stably seat to meet the sealing requirements under the condition of very small flow. SUMMARY

[0004] Therefore, the technical problem to be solved by the present application is to overcome the defects of the existing check valve that cannot open in the forward direction under very small flow to meet the operation requirements, and that is unstable in seat when the reverse flow occurs to meet the sealing requirements, and to provide a containment isolation check valve.

[0005] The present application is realized by the following technical scheme, a containment isolation check valve, comprising:

[0006] A first valve body having a first flow passage and a first valve cavity in communication with each other;

[0007] A valve disc having a first state of connecting the first flow passage and the first valve cavity under the push of the medium and a second state of blocking the connection between the two;

[0008] A support seat arranged in the first valve cavity, the support seat being provided with a guide matching part and a backflow drainage part along the flow direction of the medium,

[0009] The guide matching part cooperates with the valve disc and is suitable for guiding the valve disc to move along the first valve body axis;

[0010] The backflow drainage part has a cavity suitable for collecting backflow medium to push the valve disc to seat until the first flow passage is blocked.

[0011] Optionally, the valve disc has a throttling part, a check part and a guide part arranged in sequence along the medium flow direction;

[0012] The throttling part is sleeved in the first flow passage, and the diameter of the throttling part is smaller than the inner diameter of the first flow passage, so that an annular throttling passage is formed between the throttling part and the first flow passage;

[0013] The check part is arranged in the first valve cavity, and the diameter of the check part is larger than the inner diameter of the flow passage, so that the first flow passage is blocked to prevent medium backflow;

[0014] The guide part is a cylinder, the guide matching part is provided with a guide hole matched with the guide part, and the guide part is sleeved in the guide hole in a sliding mode;

[0015] The cavity of the backflow drainage part gradually expands in the inner diameter along the medium flow direction, and the cavity is communicated with the guide hole at one end close to the guide hole.

[0016] Optionally, the support seat is coaxially arranged with the first valve body; the support seat is provided with a flow hole communicated with the first valve cavity, and the flow hole is arranged in parallel with the axis of the first valve body.

[0017] Optionally, the flow hole is provided with two flow holes arranged on the support seat in an axial symmetry mode with the axis of the first valve body.

[0018] Optionally, the limit structure is further arranged in the first valve body, and the support seat is in abutment with the limit structure.

[0019] Optionally, the limit structure comprises a limit stop ring arranged in the first valve cavity and a limit shoulder arranged on the inner wall of the first valve cavity, and the backflow drainage part is provided with a limit end face in abutment with the limit shoulder at a side close to the first flow passage; a limit groove is arranged on the inner wall of the first valve cavity in a ring shape, and the limit stop ring is clamped in the limit groove to limit the support seat.

[0020] Optionally, the first valve cavity and the first flow passage are smoothly connected through a conical surface, the check part is formed into a conical sealing surface in the diameter expansion mode along the medium flow direction, and the maximum diameter of the conical sealing surface is larger than the inner diameter of the first flow passage.

[0021] Optionally, the second valve body is further arranged, the second valve body is provided with a second valve cavity and a second flow passage communicated with each other, and the second valve cavity is butted and communicated with the first valve cavity.

[0022] Optionally, the axis of the second valve body is arranged in a line with the axis of the first valve body.

[0023] The technical scheme has the following advantages:

[0024] 1. The containment isolation check valve provided by the present application can guide the backflow medium to gather in the cavity of the backflow guide part by gradually expanding the inner diameter of the cavity of the backflow guide part along the medium flow direction, improve the valve disc back seating force and the stability of the valve disc back seating, push the valve disc back to seat until the first flow passage is blocked, effectively prevent the medium from flowing backward, and improve the sealing performance. The present application can meet the requirements of normal opening and sealing under the condition of extremely small flow.

[0025] 2. The containment isolation check valve provided by the present application, the diameter of the throttling part of the valve disc is smaller than the inner diameter of the first flow passage, so that an annular throttling passage is formed between the throttling part and the first flow passage, and the throttling function is achieved. Under the condition of extremely small flow in the application field of nuclear power containment isolation check valves, normal opening can be ensured. The guide part of the valve disc is sleeved in the guide hole of the support seat, and plays a precise guiding role in the opening and closing of the valve. The valve disc of the present application is designed with throttling, and the valve disc is light, the valve stroke is short, and the valve is easy to open and close, and the response speed is fast.

[0026] 3. The containment isolation check valve provided by the present application, the support seat is provided with a flow hole, and a small part of the backflow medium passes through the flow hole, and most of the backflow medium is collected in the cavity of the backflow guide part, so that a pressure difference is formed before and after the valve disc, the valve disc can be smoothly seated, the stability of the valve disc back seating can be effectively improved, the sealing performance of the valve can be improved, and the leakage level requirement can be met.

[0027] 4. The containment isolation check valve provided by the present application, the support seat is limited by the limiting end face and the limiting retainer, so that the support seat is prevented from being separated, and the normal opening and closing of the valve disc is ensured.

[0028] 5. The containment isolation check valve provided by the present application, the spring in the existing check valve is removed, the opening force required by the valve disc can be effectively reduced, the valve disc can be smoothly opened under the condition of extremely small flow and extremely small pressure difference, and the problem of back and forth oscillation of the valve disc under extreme working conditions can be effectively avoided. BRIEF DESCRIPTION OF DRAWINGS

[0029] In order to more clearly illustrate the specific embodiments of the present application or the technical solutions in the prior art, the drawings needed in the following specific embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are some embodiments of the present application, and those skilled in the art can also obtain other drawings according to these drawings without creative labor.

[0030] Figure 1 It is a structural schematic diagram of the containment isolation check valve in the embodiments of the present application.

[0031] Explanation of reference signs:

[0032] 1. first valve body; 11. first flow passage; 12. first valve cavity;

[0033] 2. valve disc; 21. throttling portion; 22. check portion; 23. guide portion;

[0034] 3. support seat; 31. guide matching portion; 32. backflow drainage portion; 33. flow hole;

[0035] 4. limiting stop ring; 5. limiting shoulder;

[0036] 6. second valve body; 61. second valve cavity; 62. second flow passage. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely below with reference to the drawings. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0038] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, the terms “first”, “second”, “third” are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0039] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connection” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0040] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0041] Example 1

[0042] A containment isolation check valve, with reference toFigure 1 , comprising a first valve body 1, a valve disc 2 and a support seat 3. Wherein,

[0043] The first valve body 1 has a first flow passage 11 and a first valve cavity 12 which are in communication with each other. The first valve cavity 12 is smoothly connected with the first flow passage 11 through a taper surface, and the taper surface changes the cross-sectional area of the passage to achieve the effect of adjusting the flow and pressure.

[0044] The valve disc 2 has a throttling part 21, a check part 22 and a guide part 23 which are arranged in sequence along the direction of medium flow;

[0045] The throttling part 21 is sleeved in the first flow passage 11, and the diameter of the throttling part 21 is smaller than the inner diameter of the first flow passage 11, so that an annular throttling passage is formed between the throttling part 21 and the first flow passage 11;

[0046] The check part 22 is arranged in the first valve cavity 12, and the diameter of the check part 22 is larger than the inner diameter of the first flow passage 11, which is used to block the first flow passage 11 to prevent the backflow of the medium; the check part 22 is tapered in diameter along the direction of medium flow to form a tapered sealing surface, and the maximum diameter of the tapered sealing surface is larger than the inner diameter of the first flow passage 11.

[0047] In this embodiment, the guide part 23 is a cylinder.

[0048] When the medium flows forward, the valve disc 2 moves under the push of the medium to connect the first flow passage 11 and the first valve cavity 12, and the valve disc 2 is opened; when the medium flows reversely and flows through the valve disc 2, the valve disc 2 is pushed back to the seat until the check part 22 of the valve disc 2 blocks the first flow passage 11 to block the communication between the first flow passage 11 and the first valve cavity 12, and the valve disc 2 is closed to prevent the backflow of the medium.

[0049] The support seat 3 is arranged in the first valve cavity 12 and coaxially arranged with the first valve body 1; the support seat 3 is sequentially provided with a guide matching part 31 and a backflow guiding part 32 along the flow direction of the medium,

[0050] The guide matching part 31 cooperates with the guide part 23 of the valve disc 2 to guide the valve disc 2 to move along the axis of the first valve body 1; the guide matching part 31 is provided with a guide hole matched with the guide part 23, and the guide part 23 is sleeved in the guide hole; of course, the guide part 23 can be other structures, such as a cuboid or a hexagonal prism, and the guide hole of the guide matching part 31 cooperates with the structure of the guide part 23 to guide the valve disc 2 to move along the axis of the first valve body 1.

[0051] The backflow drainage part 32 has a horn-shaped cavity suitable for collecting backflow medium, the cavity of the backflow drainage part 32 gradually expands in the inner diameter along the medium flow direction, and the cavity is communicated with the guide hole at one end close to the guide hole. This is conducive to collecting the backflow medium into the cavity, improving the backseat force of the valve disc 2, and pushing the valve disc 2 to backseat until the first flow passage 11 is blocked, so as to realize the closing of the valve disc 2.

[0052] The support seat 3 is provided with a flow hole 33 communicated with the first valve cavity 12, and the flow hole 33 is arranged in parallel with the axis of the first valve body 1. In the embodiment, the flow hole 33 is provided with two and is arranged on the support seat 3 in axial symmetry with the axis of the first valve body 1.

[0053] In the embodiment, the containment isolation check valve further comprises a limiting structure arranged in the first valve body 1, and the support seat 3 abuts against the limiting structure.

[0054] The limiting structure comprises a limiting block ring 4 arranged in the first valve cavity 12 and a limiting shoulder 5 arranged on the inner wall of the first valve cavity 12, and the side of the backflow drainage part 32 close to the first flow passage 11 is provided with a limiting end face, and the limiting end face of the backflow drainage part 32 abuts against the limiting shoulder 5 on the inner wall of the first valve cavity 12; a ring-shaped limiting groove is arranged on the inner wall of the first valve cavity 12, and the limiting block ring 4 is clamped in the limiting groove, and the limiting shoulder 5 and the limiting block ring 4 limit the support seat 3 on both sides.

[0055] In the embodiment, the containment isolation check valve further comprises a second valve body 6, the second valve body 6 is provided with a second valve cavity 61 and a second flow passage 62 communicated with each other, and the second valve cavity 61 is butted and communicated with the first valve cavity 12. The first valve body 1 and the second valve body 6 are directly welded, and the valve as a whole requires no external leakage point.

[0056] The axis of the second valve body 6 is arranged in line with the axis of the first valve body 1.

[0057] The containment isolation check valve provided by the application can be normally opened at a very small flow rate, and because the spring is removed, there is no noise, abnormal sound and abnormal vibration during operation. When backflowing in reverse, the valve disc 2 can stably backseat at a very small pressure difference and reach a certain sealing leakage level, and the sealing performance is stable.

[0058] As an alternative embodiment, the valve disc only comprises the check part 22 and the guide part 23.

[0059] As an alternative embodiment, the cavity of the backflow drainage part is a stepped shape gradually expanding in the inner diameter along the medium flow direction.

[0060] Obviously, the above embodiments are merely example for clearly illustrating but not limitation to the embodiments. Based on the above description, other different forms of changes or variations can be made by those skilled in the art. Here, all the embodiments need not and can not be enumerated. The obvious changes or variations derived from the above description are still within the protection scope of the present application.

Claims

1. A containment isolation check valve, characterized in that, include: The first valve body (1) has a first flow passage (11) and a first valve chamber (12) that are interconnected; The valve disc (2) has a first state that connects the first flow passage (11) and the first valve chamber (12) under the push of the medium and a second state that blocks the connection between the two; A support base (3) is provided inside the first valve chamber (12). The support base (3) is provided with a guide fitting part (31) and a return flow guiding part (32) in sequence along the flow direction of the medium. The guide fitting part (31) cooperates with the valve disc (2) and is suitable for guiding the valve disc (2) to move along the axis of the first valve body (1); The return flow guide (32) has a cavity suitable for collecting the return medium, so as to push the valve disc (2) back to seat until the first flow passage (11) is blocked; The valve disc (2) has a throttling part (21), a check part (22) and a guide part (23) arranged sequentially along the medium flow direction; The guide fitting part (31) is provided with a guide hole that mates with the guide part (23), and the guide part (23) is slidably fitted into the guide hole; The cavity of the reflux drainage section (32) gradually expands in diameter along the medium flow direction, and the end of the cavity near the guide hole is connected to the guide hole.

2. The containment isolation check valve according to claim 1, characterized in that, The throttling part (21) is fitted inside the first flow channel (11), and the diameter of the throttling part (21) is smaller than the inner diameter of the first flow channel (11) so that an annular throttling channel is formed between the throttling part (21) and the first flow channel (11). The check valve (22) is located in the first valve chamber (12). The diameter of the check valve (22) is larger than the inner diameter of the flow passage, which is suitable for blocking the first flow passage (11) to prevent the medium from flowing back. The guide part (23) is a cylinder.

3. The containment isolation check valve according to claim 2, characterized in that, The support base (3) is coaxially arranged with the first valve body (1); the support base (3) has a flow hole (33) communicating with the first valve cavity (12), and the flow hole (33) is arranged parallel to the axis of the first valve body (1).

4. The containment isolation check valve according to claim 3, characterized in that, Two flow holes (33) are provided and are symmetrically arranged on the support base (3) with the axis of the first valve body (1) as the axis.

5. The containment isolation check valve according to any one of claims 1-4, characterized in that, It also includes a limiting structure, which is located inside the first valve body (1), and the support seat (3) abuts against the limiting structure.

6. The containment isolation check valve according to claim 5, characterized in that, The limiting structure includes a limiting retaining ring (4) disposed in the first valve cavity (12) and a limiting shoulder (5) disposed on the inner wall of the first valve cavity (12). The return flow guide part (32) has a limiting end face that abuts against the limiting shoulder (5) on the side near the first flow channel (11). A ring-shaped limiting groove is opened on the inner wall of the first valve cavity (12). The limiting retaining ring (4) is engaged in the limiting groove to limit the support seat (3).

7. The containment isolation check valve according to any one of claims 2-4, characterized in that, The first valve chamber (12) and the first flow passage (11) are smoothly connected by a conical surface. The check valve (22) is expanded along the medium flow direction to form a conical sealing surface. The maximum diameter of the conical sealing surface is greater than the inner diameter of the first flow passage (11).

8. The containment isolation check valve according to any one of claims 1-4, characterized in that, It also includes a second valve body (6), which has a second valve chamber (61) and a second flow passage (62) that are interconnected. The second valve chamber (61) is connected to and communicates with the first valve chamber (12).

9. The containment isolation check valve according to claim 8, characterized in that, The axis of the second valve body (6) is collinear with the axis of the first valve body (1).

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