A special breathing valve for nuclear power K1 type electrical instrument equipment

Abstract

The invention discloses a breathing valve for nuclear power K1 type electrical instrument equipment, belonging to the field of nuclear power equipment. The breathing valve for nuclear power K1 type electrical instrument equipment comprises a valve body, which is provided with a first vent hole; a locking piece, which is sealed and connected to one end of the valve body, and a first sealing ring made of silicone rubber is provided between the locking piece and the valve body; a protective breathable mesh assembly, which is pressed by a stainless steel mesh and embedded in the other end of the valve body, and the protective breathable mesh assembly has a second vent hole; a breathing valve cover sleeve, a sealing sleeve is provided at the other end of the valve body, and a second sealing ring made of silicone rubber is provided between the breathing valve cover sleeve and the valve body; a third vent hole is provided on the breathing valve cover sleeve, and the first vent hole, the second vent hole and the third vent hole are connected to improve the air permeability of the breathing valve, and the protective breathable mesh assembly can simultaneously ensure the air permeability and high protection of the breathing valve, and the silicone rubber material has good radiation resistance and high temperature resistance, which effectively prolongs the service life of the entire breathing valve.

Description

Technical Field

[0001] The invention relates to the technical field of nuclear power equipment, and in particular to a breathing valve dedicated to nuclear power K1 type electrical instrument equipment. Background Art

[0002] The breathing valve is a component used to maintain the balance of air pressure inside and outside the equipment, and can discharge the condensed water inside the equipment while ensuring the protection level of the equipment. The K1 type electrical equipment in the containment of a nuclear power plant performs the safety function of the nuclear power plant, that is, to maintain the normal operation of the equipment function under severe baseline accidents of nuclear power. The severe accident environment of a nuclear power plant is high temperature, high humidity, instantaneous high pressure, high radiation, acid and alkali solutions, etc. Under such extreme conditions, the breathing valve needs to maintain an extremely high air permeability to prevent the instantaneous high pressure from damaging the structure of the electrical equipment.

[0003] Judging from the sealing materials and sealing structures used, the existing breathing valves are mostly cast from polymer materials or press-formed from metal particles. The former has poor high temperature resistance and poor radiation resistance, while the latter has problems such as low air permeability. Therefore, neither can simultaneously meet the high performance requirements in the harsh environment unique to nuclear power.

[0004] Therefore, it is urgent to propose a breathing valve with radiation resistance, high air permeability and high protection for nuclear power K1 class electrical equipment to solve the above-mentioned technical problems existing in the prior art. Summary of the invention

[0005] The purpose of the present invention is to provide a breathing valve specially used for nuclear power K1 type electrical instrument equipment, which has good radiation resistance, high air permeability and high protection.

[0006] To achieve the above purpose, the technical solution adopted by the present invention is:

[0007] A breathing valve for nuclear power K1 type electrical instrument equipment, including:

[0008] A valve body, wherein a first vent hole is provided on the valve body;

[0009] A locking member, sealingly connected to one end of the valve body, a first sealing ring is provided between the locking member and the valve body, and the first sealing ring is made of silicone rubber;

[0010] A protective air-permeable mesh assembly is embedded in the other end of the valve body, the protective air-permeable mesh assembly has a second vent hole, and the protective air-permeable mesh assembly is pressed from a stainless steel mesh;

[0011] A breathing valve cover sleeve, a sealing sleeve is arranged at the other end of the valve body, a second sealing ring is arranged between the breathing valve cover sleeve and the valve body, and the second sealing ring is made of silicone rubber; a third air vent is arranged on the breathing valve cover sleeve, and the first air vent, the second air vent and the third air vent are connected.

[0012] As a preferred technical solution, the protective breathable mesh assembly includes:

[0013] A mesh plate and a dense woven net, wherein the mesh plate and the dense woven net are spaced apart along the axial direction of the valve body, and the mesh plate is located on the outside of the dense woven net, the mesh plate is provided with the second ventilation hole, and the mesh plate and the dense woven net are connected through an air chamber.

[0014] As a preferred technical solution, the protective breathable mesh assembly also includes:

[0015] An annular connecting plate is used to connect the mesh plate and the dense woven mesh, and the connecting plate is interference-connected to the valve body.

[0016] As a preferred technical solution, the protective breathable mesh panel assembly is an integrally formed structure.

[0017] As a preferred technical solution, the valve body includes:

[0018] A first connecting part, a bridging part and a second connecting part are connected, the first connecting part is connected to the locking piece, the first vent hole is arranged on the periphery of the first connecting part, the bridging part is a hexagonal structure, the protective breathable mesh assembly is embedded in the second connecting part and the end face does not protrude from the end face of the second connecting part, and the breathing valve cover sealing sleeve is arranged on the periphery of the second connecting part.

[0019] As a preferred technical solution, a puncture protrusion is provided at one end of the locking member close to the breathing valve cover sleeve, and the puncture protrusion is made of metal material.

[0020] As a preferred technical solution, the locking member includes:

[0021] A locking nut, wherein the edge of the locking nut is provided with the puncturing protrusion, and the outer periphery of the first connecting portion is provided with an external thread adapted to the locking nut.

[0022] As a preferred technical solution, the breathing valve cover sleeve is provided with an internal thread, and the outer periphery of the second connecting portion is correspondingly provided with an external thread.

[0023] As a preferred technical solution, the breathing valve cover comprises:

[0024] A connecting ring plate, the third vent hole is provided in the circumference of the connecting ring plate, and the inner wall of the connecting ring plate is provided with the inner thread;

[0025] The end cover is arranged at one end of the connecting ring plate away from the valve body.

[0026] As a preferred technical solution, a positioning step is provided inside the breathing valve cover sleeve, the valve body abuts against the positioning step, and the second sealing ring is provided at the abutting position.

[0027] The beneficial effects of the present invention are:

[0028] The invention proposes a special breathing valve for nuclear power K1 type electrical instrument equipment. A first sealing ring made of silicone rubber is provided between the locking member and the valve body. A second sealing ring made of silicone rubber is provided between the breathing valve cover and the valve body. The silicone rubber material has good radiation resistance and high temperature resistance, which effectively prolongs the service life of the entire breathing valve. By providing the first sealing ring between the locking member and the valve body, the structural gap between the two can be effectively sealed to achieve the high protection level requirement on the inside of the breathing valve. By providing the second sealing ring between the breathing valve cover and the valve body, the structural gap between the two can be effectively sealed to achieve the high protection level requirement on the outside of the breathing valve. A first vent is provided on the valve body, and a protective breathable mesh assembly is embedded in the valve body and has a second vent. The protective breathable mesh assembly is pressed from a stainless steel mesh, which can simultaneously ensure the air permeability and high protection of the breathing valve. A third vent is provided on the breathing valve cover. The first vent, the second vent and the third vent are connected, which effectively improves the air permeability of the breathing valve. The breathing valve has a simple and sophisticated structure, is easy to produce and assemble, and can meet the use requirements of nuclear power K1 class electrical equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural schematic diagram of a special breathing valve for nuclear power K1 type electrical instrument equipment provided by a specific embodiment of the present invention;

[0030] Figure 2 It is a cross-sectional view of a breathing valve dedicated to nuclear power K1 type electrical instrument equipment provided by a specific embodiment of the present invention;

[0031] Figure 3 It is an exploded view of a breathing valve dedicated to nuclear power K1 type electrical instrument equipment provided by a specific embodiment of the present invention;

[0032] Figure 4 It is a schematic structural diagram of the breathing valve cover provided by a specific embodiment of the present invention after a part of the connecting ring plate is removed.

[0033] In the figure:

[0034] 1. valve body; 11. first connecting portion; 111. first vent hole; 12. bridge portion; 13. second connecting portion;

[0035] 2. Locking piece; 21. Locking nut; 22. Puncture protrusion;

[0036] 3. The first sealing ring;

[0037] 4. Protective breathable mesh assembly; 41. Mesh plate; 411. Second ventilation hole; 42. Dense woven mesh; 43. Connecting plate; 44. Air chamber;

[0038] 5. Breathing valve cover; 51. Connecting ring plate; 52. End cover; 511. Third vent hole;

[0039] 6. Second sealing ring. DETAILED DESCRIPTION

[0040] In order to make the technical problems solved by the present invention, the technical solutions adopted and the technical effects achieved clearer, the technical solutions of the present invention are further described below in conjunction with the accompanying drawings and through specific implementation methods. It is understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for the convenience of description, only the parts related to the present invention are shown in the accompanying drawings, not all.

[0041] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0042] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0043] In the description of this embodiment, the terms "upper", "lower", "left", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operate in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0044] This embodiment provides a breathing valve dedicated to nuclear power K1 type electrical instrument equipment, such as Figures 1 to 4 As shown, the breathing valve comprises a valve body 1, a locking member 2, a protective breathable mesh assembly 4 and a breathing valve cover 5, wherein the valve body 1 is the main structure of the breathing valve, the valve body 1 is provided with an air flow channel along its axial center, and the valve body 1 is provided with a first vent 111, which is used to increase the amount of air in and out of the valve body 1. The locking member 2 is sealed and connected to one end of the valve body 1, and a first sealing ring 3 is provided between the locking member 2 and the valve body 1, and the first sealing ring 3 is made of silicone rubber. The protective breathable mesh assembly 4 is embedded in the other end of the valve body 1, and the protective breathable mesh assembly 4 has a second vent 411. The protective breathable mesh assembly 4 is pressed by a stainless steel mesh, which can simultaneously improve the air permeability and protection level of the valve body 1. The breathing valve cover 5 sealing sleeve is provided at the other end of the valve body 1, and a second sealing ring 6 is provided between the breathing valve cover 5 and the valve body 1, and the second sealing ring 6 is made of silicone rubber. The breathing valve cover 5 is provided with a third vent 511, which is used to realize the exchange of gas between the valve body 1 and the outside. The first vent hole 111, the second vent hole 411 and the third vent hole 511 are connected, which effectively improves the air permeability of the breathing valve. The silicone rubber material has good radiation resistance and high temperature resistance, which can effectively extend the service life of the entire breathing valve; by setting the first sealing ring 3 between the locking member 2 and the valve body 1, the structural gap between the two can be effectively sealed to achieve the high protection level requirement on the inside of the breathing valve; by setting the second sealing ring 6 between the breathing valve cover 5 and the valve body 1, the structural gap between the two can be effectively sealed to achieve the high protection level requirement on the outside of the breathing valve. The breathing valve has a simple and sophisticated structure, is easy to produce and assemble, and can meet the use requirements of nuclear power K1 class electrical equipment.

[0045] Specifically, the valve body 1 includes a first connecting portion 11, a bridging portion 12, and a second connecting portion 13 connected to each other. The first connecting portion 11 is connected to the locking member 2. The outer periphery of the first connecting portion 11 is provided with a first vent hole 111. Optionally, the number of the first vent holes 111 is provided in plurality, for example, four in this embodiment, and the four first vent holes 111 are uniformly distributed on the outer periphery of the first connecting portion 11 along the circumference to improve the uniformity of air permeability.

[0046] Optionally, the locking member 2 includes a locking nut 21, which is a hexagonal structure, and the outer periphery of the first connecting portion 11 is provided with an external thread that is compatible with the locking nut 21, so as to realize a threaded connection between the locking member 2 and the valve body 1. Preferably, a puncture protrusion 22 is provided on the edge of the locking nut 21 close to one end of the breathing valve cover 5, and the puncture protrusion 22 is made of metal material. On the one hand, the above structure of the locking member 2 can reliably ensure that the breathing valve can be reliably locked on the electrical equipment in a harsh high pressure difference environment, effectively avoiding stress shedding under the action of pressure, and on the other hand, it has the effect of piercing the insulating spray-coated layer on the surface of the electrical equipment to achieve conductivity, so as to achieve the conductive continuity between the valve body 1 and the main body of the electrical equipment.

[0047] The bridge portion 12 is a hexagonal structure for fastening the bridge, which has a large body and a flat crimping surface, and has the functions of enhancing fastening and surface sealing. Optionally, the outer diameter of the bridge portion 12 is the same as the outer diameter of the locking member 2 to ensure the compactness of the structure.

[0048] The protective breathable mesh assembly 4 is embedded in the second connecting portion 13 and its end surface does not protrude from the end surface of the second connecting portion 13 . The breathing valve cover sleeve 5 is sealingly sleeved on the outer periphery of the second connecting portion 13 .

[0049] Optionally, the protective breathable mesh assembly 4 includes a mesh plate 41 and a dense woven mesh 42, the mesh plate 41 and the dense woven mesh 42 are arranged at intervals along the axial direction of the valve body 1, and the mesh plate 41 is located on the outside of the dense woven mesh 42, the mesh plate 41 is provided with a second vent 411 to enhance the air permeability, the dense woven mesh 42 has a regular dense structure to play a high protective role, and the mesh plate 41 and the dense woven mesh 42 are connected through an air chamber 44. Preferably, a plurality of second vents 411 are provided, and the plurality of second vents 411 are evenly distributed on the mesh plate 41. The protective breathable mesh assembly 4 preferably adopts a breathable structure formed by pressing a stainless steel mesh according to specific rules and requirements, which can achieve high protection of the equipment while meeting high air permeability.

[0050] Further optionally, the protective breathable mesh assembly 4 also includes an annular connecting plate 43, which is used to connect the mesh plate 41 and the dense woven mesh 42. When assembled with the valve body 1, the outer peripheral side wall of the connecting plate 43 is interference-connected to the inner peripheral side wall of the second connecting portion 13 of the valve body 1. Preferably, a positioning step surface is provided inside the valve body 1, and the end of the connecting plate 43 abuts against the positioning step surface. Further preferably, the axial distance between the positioning step surface and the outer end surface of the second connecting portion 13 is not less than the axial size of the protective breathable mesh assembly 4, so that the entire protective breathable mesh assembly 4 is embedded in the valve body 1 to maintain the compactness of the structure of the breathing valve.

[0051] The protective breathable mesh assembly 4 in this embodiment is an integrated structure, that is, the mesh plate 41, the connecting plate 43 and the dense woven mesh 42 are integrally formed and then embedded in the second connecting portion 13 of the valve body 1, thereby enhancing the structural strength. It has been verified through experiments that, under the same protection level, the air permeability of the nuclear power K1 class electrical instrumentation and equipment dedicated breathing valve provided in this embodiment is several times that of the same type of breathing valves on the market, so that the life of the electrical instrumentation and equipment using it is also much longer than that of similar equipment on the market.

[0052] like Figure 4As shown, the axial cross section of the breathing valve cover sleeve 5 is roughly U-shaped, including a connecting ring plate 51 and an end cover 52, and the end cover 52 is arranged at the end of the connecting ring plate 51 away from the valve body 1. The inner wall of the connecting ring plate 51 is provided with an internal thread, and the outer periphery of the second connecting portion 13 is adapted to be provided with an external thread to achieve thread locking of the breathing valve cover sleeve 5 and the valve body 1. The connecting ring plate 51 is provided with a plurality of third vent holes 511 at intervals in the circumferential direction, preferably distributed at equal intervals, and the third vent holes 511 are used to achieve gas exchange between the valve body 1 and the outside.

[0053] Preferably, a positioning step is provided inside the breathing valve cover 5, the end of the valve body 1 abuts against the positioning step, and a second sealing ring 6 is provided at the abutment. The threaded connection between the breathing valve cover 5 and the valve body 1 and the provision of the second sealing ring 6 eliminate the assembly gap between the two, which is conducive to ensuring the protective effect.

[0054] The breathing valve cover sleeve 5 in this embodiment is made of stainless steel to further improve the structural strength and meet the protection level requirements.

[0055] The above embodiments are only to illustrate the basic principles and characteristics of the present invention. The present invention is not limited by the above embodiments. Without departing from the spirit and scope of the present invention, the present invention may be subject to various changes and modifications, which are within the scope of the present invention. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A breathing valve for nuclear power K1 type electrical equipment, characterized in that: include: A valve body (1), wherein the valve body (1) is provided with a first vent hole (111); A locking member (2) is sealingly connected to one end of the valve body (1), a first sealing ring (3) is provided between the locking member (2) and the valve body (1), and the first sealing ring (3) is made of silicone rubber; A protective air-permeable mesh assembly (4) is embedded in the other end of the valve body (1), the protective air-permeable mesh assembly (4) having a second vent hole (411), and the protective air-permeable mesh assembly (4) is formed by pressing a stainless steel mesh; A breathing valve cover sleeve (5), wherein the sealing sleeve is arranged at the other end of the valve body (1), a second sealing ring (6) is arranged between the breathing valve cover sleeve (5) and the valve body (1), and the second sealing ring (6) is made of silicone rubber; a third vent hole (511) is arranged on the breathing valve cover sleeve (5), and the first vent hole (111), the second vent hole (411) and the third vent hole (511) are connected; The protective air-permeable mesh panel assembly (4) comprises: a mesh plate (41) and a dense woven net (42), wherein the mesh plate (41) and the dense woven net (42) are arranged at intervals along the axial direction of the valve body (1), and the mesh plate (41) is located outside the dense woven net (42), the mesh plate (41) is provided with the second vent hole (411), and the mesh plate (41) and the dense woven net (42) are connected via an air chamber (44); The protective breathable mesh assembly (4) further comprises: an annular connecting plate (43) used to connect the mesh plate (41) and the dense woven mesh (42), the connecting plate (43) being interference-connected to the valve body (1); The protective breathable mesh panel assembly (4) is an integrally formed structure.

2. The breathing valve for nuclear power K1 type electrical instrument equipment according to claim 1 is characterized in that: The valve body (1) comprises: A first connecting portion (11), a bridging portion (12) and a second connecting portion (13) are connected to each other, the first connecting portion (11) is connected to the locking member (2), the first vent hole (111) is arranged on the periphery of the first connecting portion (11), the bridging portion (12) is a hexagonal structure, the protective breathable mesh assembly (4) is embedded in the second connecting portion (13) and the end surface does not protrude from the end surface of the second connecting portion (13), and the breathing valve cover sleeve (5) is sealed and sleeved on the periphery of the second connecting portion (13).

3. The breathing valve for nuclear power K1 type electrical instrument equipment according to claim 2 is characterized in that: A puncture protrusion (22) is provided at one end of the locking member (2) close to the breathing valve cover sleeve (5), and the puncture protrusion (22) is made of a metal material.

4. The breathing valve for nuclear power K1 type electrical instrument equipment according to claim 3 is characterized in that: The locking member (2) comprises: A locking nut (21), wherein the edge of the locking nut (21) is provided with the piercing protrusion (22), and the outer periphery of the first connecting portion (11) is provided with an external thread that matches the locking nut (21).

5. The breathing valve for nuclear power K1 type electrical instrument equipment according to claim 2 is characterized in that: The breathing valve cover sleeve (5) is provided with an internal thread, and the outer periphery of the second connecting portion (13) is correspondingly provided with an external thread.

6. The breathing valve for nuclear power K1 type electrical instrument equipment according to claim 5 is characterized in that: The breathing valve cover sleeve (5) comprises: A connecting ring plate (51) having the third vent hole (511) opened in its circumference, and the inner wall of the connecting ring plate (51) having the internal thread; An end cover (52) is arranged at an end of the connecting ring plate (51) away from the valve body (1).

7. The breathing valve for nuclear power K1 type electrical instrument equipment according to claim 1 is characterized in that: A positioning step is provided inside the breathing valve cover sleeve (5), the valve body (1) abuts against the positioning step, and the second sealing ring (6) is provided at the abutting position.

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