Special breather valve for nuclear power K1 type electric instrument equipmentTechnical Field
The invention relates to the technical field of nuclear power equipment, in particular to a special breather valve for nuclear power K1-type electrical equipment.
Background
The breather valve is used for maintaining the balance of the internal and external air pressure of the equipment, and can drain the condensed water in the equipment out of the equipment while ensuring the protection level of the equipment. And the K1 type electric instrument equipment in the containment vessel of the nuclear power plant executes the safety function of the nuclear power plant, namely, the normal operation of the equipment function is maintained under the serious basic accident of nuclear power. The severe accident environment of the nuclear power plant is high temperature, high humidity, instant high pressure, high irradiation, acid-base solution and the like, and under the extreme condition, the breather valve is required to keep extremely high air permeability so as to prevent the instant high pressure from damaging the structure of the electrotometer.
At present, most of existing breather valves are formed by casting high polymer materials or crimping metal particles from the aspects of used sealing materials and sealing structures, the former has the problems of poor high temperature resistance and poor irradiation resistance, and the latter has the problems of low air permeability and the like, so that the requirements of high performance under the special severe environment of nuclear power cannot be met at the same time.
Therefore, there is a need to propose a breather valve with radiation resistance, high air permeability and high protection for a nuclear power K1-type electrical instrument device to solve the above technical problems in the prior art.
Disclosure of Invention
The invention aims to provide a special breather valve for nuclear power K1-type electrical equipment, which has good irradiation resistance, high air permeability and high protection.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
A special breather valve for nuclear power K1-type electrical equipment, comprising:
The valve body is provided with a first vent hole;
the locking piece is connected to one end of the valve body in a sealing way, a first sealing ring is arranged between the locking piece and the valve body, and the first sealing ring is made of silicon rubber;
The protective ventilation screen plate assembly is embedded at the other end of the valve body and is provided with a second ventilation hole, and the protective ventilation screen plate assembly is formed by pressing a stainless steel screen;
The breather valve cover sleeve is arranged at the other end of the valve body in a sealing mode, a second sealing ring is arranged between the breather valve cover sleeve and the valve body and made of silicon rubber, a third vent hole is formed in the breather valve cover sleeve, and the first vent hole, the second vent hole and the third vent hole are communicated.
As a preferred technical solution, the protective ventilation screen assembly includes:
The mesh plate and the compact woven net are arranged at intervals along the axial direction of the valve body, the mesh plate is positioned on the outer side of the compact woven net, the second ventilation holes are formed in the mesh plate, and the mesh plate is communicated with the compact woven net through an air cavity.
As a preferred technical solution, the protective ventilation screen assembly further includes:
the annular connecting plate is used for connecting the mesh plate with the compact woven mesh, and the connecting plate is connected with the valve body in an interference mode.
As the preferable technical scheme, the protective breathable net plate component is of an integrated structure.
As a preferred technical solution, the valve body includes:
The novel air valve comprises a first connecting part, a bridging part and a second connecting part, wherein the first connecting part is connected with a locking piece, the periphery of the first connecting part is provided with a first vent hole, the bridging part is of a hexagonal structure, a protective ventilation screen plate assembly is embedded in the second connecting part, the end face of the protective ventilation screen plate assembly does not protrude out of the end face of the second connecting part, and a breather valve cover sleeve is sealed and sleeved on the periphery of the second connecting part.
As the preferable technical scheme, one end of the locking piece, which is close to the breather valve cover sleeve, is provided with a puncture protrusion, and the puncture protrusion is made of metal materials.
As a preferred technical solution, the locking member includes:
The edge of the locking nut is provided with the puncture protrusion, and the periphery of the first connecting part is provided with external threads matched with the locking nut.
As the preferable technical scheme, the breathing valve cover is sleeved with internal threads, and external threads are correspondingly arranged on the periphery of the second connecting part.
As a preferred technical solution, the respiratory valve cover sleeve includes:
The connecting ring plate is circumferentially provided with the third vent holes, and the inner wall of the connecting ring plate is provided with the internal threads;
And the end cover is arranged at one end of the connecting annular plate, which is far away from the valve body.
As the preferable technical scheme, the inside of breather valve lid cover is provided with the location step, the valve body butt in the location step, and butt department is equipped with the second sealing washer.
The beneficial effects of the invention are as follows:
The special breather valve for the nuclear power K1 type electric instrument equipment is characterized in that a first sealing ring made of silicon rubber is arranged between a locking piece and a valve body, a second sealing ring made of silicon rubber is arranged between a breather valve cover sleeve and the valve body, the silicon rubber material has good irradiation resistance and high temperature resistance, the service life of the whole breather valve is effectively prolonged, a structural gap between the locking piece and the valve body can be effectively sealed by arranging the first sealing ring between the locking piece and the valve body, the high protection level requirement of the inner side of the breather valve is realized, and the structural gap between the locking piece and the valve body can be effectively sealed by arranging the second sealing ring between the breather valve cover sleeve and the valve body, so that the high protection level requirement of the outer side of the breather valve is realized. Be provided with first air vent on the valve body, the ventilative otter board subassembly of protection inlays and locates on the valve body and have the second air vent, and the ventilative otter board subassembly of protection is formed by stainless steel mesh suppression, can guarantee the gas permeability and the high protectiveness of breather valve simultaneously, is equipped with the third air vent on the breather valve lid cover, and first air vent, second air vent and third air vent are linked together, effectively improve the air permeability of this breather valve. The breather valve is simple and exquisite in structure, convenient to produce and assemble and capable of meeting the use requirements of nuclear power K1-type electric instrument equipment.
Drawings
FIG. 1 is a schematic diagram of a special breather valve for nuclear power K1-type electrical equipment, provided by an embodiment of the invention;
FIG. 2 is a cross-sectional view of a special breather valve for nuclear power K1-type electrical equipment provided by an embodiment of the invention;
FIG. 3 is an exploded view of a special breather valve for nuclear power K1-type electrical equipment provided by an embodiment of the invention;
fig. 4 is a schematic structural view of a respiratory valve cover sleeve according to an embodiment of the present invention after removing a part of a connecting ring plate.
In the figure:
1. Valve body, 11, first connecting part, 111, first vent hole, 12, bridging part, 13, second connecting part;
2. A locking member; 21, a lock nut 22, a piercing protrusion;
3. A first seal ring;
4. The protective ventilation screen plate assembly comprises 41 parts of a mesh plate, 411 parts of a second ventilation hole, 42 parts of a compact woven mesh, 43 parts of a connecting plate, 44 parts of an air cavity;
5. The breathing valve cover sleeve, 51, a connecting annular plate, 52, an end cover, 511 and a third vent hole;
6. and a second sealing ring.
Detailed Description
In order to make the technical problems solved, the technical scheme adopted and the technical effects achieved by the invention more clear, the technical scheme of the invention is further described below by a specific embodiment in combination with the attached drawings. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the drawings related to the present invention are shown.
In the description of the present invention, unless explicitly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, and may, for example, be fixedly connected, detachably connected, or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intervening medium, or in communication between two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In the present invention, unless expressly stated or limited otherwise, a first feature "above" or "below" a second feature may include both the first and second features being in direct contact, as well as the first and second features not being in direct contact but being in contact with each other through additional features therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are orientation or positional relationships based on those shown in the drawings, and are merely for convenience of description and simplicity of operation, and do not indicate or imply that the apparatus or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like, are used merely for distinguishing between descriptions and not for distinguishing between them.
The embodiment provides a special breather valve of nuclear power K1 class electricity appearance equipment, as shown in fig. 1 to 4, this breather valve includes valve body 1, retaining member 2, protection ventilative otter board subassembly 4 and breather valve lid cover 5, and wherein, valve body 1 is the major structure of breather valve, and valve body 1 is equipped with the air flow path along its axial center, is provided with first air vent 111 on the valve body 1 for increase the business turn over tolerance in the valve body 1. The retaining member 2 is connected to one end of the valve body 1 in a sealing way, a first sealing ring 3 is arranged between the retaining member 2 and the valve body 1, and the first sealing ring 3 is made of silicon rubber. The other end of the valve body 1 is embedded with the protective ventilation screen plate assembly 4, the protective ventilation screen plate assembly 4 is provided with a second ventilation hole 411, the protective ventilation screen plate assembly 4 is formed by pressing stainless steel mesh, and the ventilation property and the protection level of the valve body 1 can be improved simultaneously. The breather valve cover sleeve 5 is arranged at the other end of the valve body 1 in a sealing manner, a second sealing ring 6 is arranged between the breather valve cover sleeve 5 and the valve body 1, and the second sealing ring 6 is made of silicon rubber. The breather valve cover 5 is provided with a third vent 511 for exchanging gas between the inside of the valve body 1 and the outside. The first vent hole 111, the second vent hole 411 and the third vent hole 511 are communicated, and the air permeability of the breather valve is effectively improved. The silicon rubber material has good irradiation resistance and high temperature resistance, the service life of the whole breather valve can be effectively prolonged, the structural gap between the locking piece 2 and the valve body 1 can be effectively sealed, the high protection level requirement of the inner side of the breather valve is realized, and the structural gap between the locking piece 2 and the valve body 1 can be effectively sealed, and the high protection level requirement of the outer side of the breather valve is realized by arranging the second sealing ring 6 between the breather valve cover 5 and the valve body 1. The breather valve is simple and exquisite in structure, convenient to produce and assemble and capable of meeting the use requirements of nuclear power K1-type electric instrument equipment.
Specifically, the valve body 1 includes a first connecting portion 11, a bridging portion 12, and a second connecting portion 13 that are connected, the first connecting portion 11 being connected to the retainer 2, the outer periphery of the first connecting portion 11 being provided with a first vent hole 111. Alternatively, the number of the first ventilation holes 111 is plural, for example, four in this embodiment, and the four first ventilation holes 111 are uniformly distributed on the periphery of the first connection portion 11 along the circumference, so as to improve ventilation uniformity.
Optionally, the locking member 2 includes a locking nut 21, where the locking nut 21 has a hexagonal structure, and an external thread matched with the locking nut 21 is disposed on the periphery of the first connecting portion 11, so that the locking member 2 is in threaded connection with the valve body 1. Preferably, the edge of the lock nut 21 near one end of the breather valve cover 5 is provided with a piercing protrusion 22, and the piercing protrusion 22 is made of metal material. The above-mentioned structure of retaining member 2 can reliably guarantee on the one hand that the breather valve is reliably locked on the electrical equipment under the high pressure differential environment of severity, effectively avoids stress under the pressure effect to drop, and on the other hand it has the insulating plastic coating that pierces electrical equipment top layer and realizes electrically conductive effect to realize the electrically conductive continuity of valve body 1 and electrical equipment body.
The bridge 12 is a hexagonal structure for fastening bridge, which is large in shape and flat in crimping surface, and has the functions of reinforcing fastening and surface sealing. Alternatively, the outer diameter of the bridge 12 is the same as the outer diameter of the locking member 2, ensuring compactness.
The protective ventilation screen plate assembly 4 is embedded in the second connecting portion 13, the end face of the protective ventilation screen plate assembly does not protrude out of the end face of the second connecting portion 13, and the breather valve cover sleeve 5 is sealed and sleeved on the periphery of the second connecting portion 13.
Optionally, the protection ventilation screen assembly 4 comprises a mesh plate 41 and a compact woven mesh 42, the mesh plate 41 and the compact woven mesh 42 are arranged along the axial direction of the valve body 1 at intervals, the mesh plate 41 is positioned on the outer side of the compact woven mesh 42, the mesh plate 41 is provided with second ventilation holes 411, ventilation is enhanced, the compact woven mesh 42 has a regular compact structure to play a role in high protection, and the mesh plate 41 and the compact woven mesh 42 are communicated through an air cavity 44. Preferably, the second ventilation holes 411 are provided in plurality, and the plurality of second ventilation holes 411 are uniformly distributed on the mesh plate 41. The protective air-permeable screen assembly 4 preferably adopts an air-permeable structure formed by pressing stainless steel mesh with specific rules and requirements, which can simultaneously realize high protection of the equipment under the condition of meeting high air permeability.
Further alternatively, the protective ventilation screen assembly 4 further comprises an annular connecting plate 43, the connecting plate 43 is used for connecting the mesh plate 41 and the dense woven mesh 42, when the protective ventilation screen assembly is assembled with the valve body 1, the outer peripheral side wall of the connecting plate 43 is in interference connection with the inner peripheral side wall of the second connecting portion 13 of the valve body 1, preferably, a positioning step surface is arranged in the valve body 1, and the end part of the connecting plate 43 is abutted against the positioning step surface. It is further preferable that the axial distance between the positioning step surface and the outer end surface of the second connecting portion 13 is not smaller than the axial dimension of the protective gas-permeable screen assembly 4, so that the entire protective gas-permeable screen assembly 4 is embedded in the valve body 1, and the structural compactness of the breather valve is maintained.
The protective ventilation screen assembly 4 in this embodiment is an integrally formed structure, that is, the mesh plate 41, the connecting plate 43 and the dense woven mesh 42 are integrally formed and then are inlaid in the second connecting portion 13 of the valve body 1, so that the structural strength is enhanced. Experiments prove that under the same protection level, the air permeability of the special breather valve for the nuclear power K1 type electric instrument equipment provided by the embodiment is several times that of the breather valve of the same type in the market, so that the service life of the electric instrument equipment applying the special breather valve is far longer than that of similar equipment in the market.
As shown in fig. 4, the respiratory valve cover sleeve 5 has a substantially U-shaped axial section, and includes a connection ring plate 51 and an end cap 52, and the end cap 52 is disposed at an end of the connection ring plate 51 remote from the valve body 1. The inner wall of the connecting ring plate 51 is provided with internal threads, and the outer periphery of the second connecting part 13 is provided with external threads correspondingly so as to realize the threaded locking of the breather valve cover sleeve 5 and the valve body 1. The connection ring plate 51 is provided with a plurality of third vent holes 511 at a circumferential interval, preferably equally spaced, and the third vent holes 511 are used to realize exchange of gas between the inside of the valve body 1 and the outside.
Preferably, a positioning step is arranged in the breather valve cover sleeve 5, the end part of the valve body 1 is abutted against the positioning step, and a second sealing ring 6 is arranged at the abutting part. The mode of threaded connection of the breather valve cover sleeve 5 and the valve body 1 and the arrangement of the second sealing ring 6 eliminate the assembly gap of the breather valve cover sleeve and the valve body, thereby being beneficial to ensuring the protection effect.
The breather valve cover sleeve 5 in the embodiment is made of stainless steel, so that the structural strength is further improved, and the protection level requirement is met.
The above embodiments merely illustrate the basic principle and features of the present invention, and the present invention is not limited to the above embodiments, but may be varied and altered without departing from the spirit and scope of the present invention. The scope of the invention is defined by the appended claims and equivalents thereof.