CN221121119U - A middle cavity double sealing structure for a stop valve and a stop valve using the same - Google Patents
A middle cavity double sealing structure for a stop valve and a stop valve using the same Download PDFInfo
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- CN221121119U CN221121119U CN202323100671.9U CN202323100671U CN221121119U CN 221121119 U CN221121119 U CN 221121119U CN 202323100671 U CN202323100671 U CN 202323100671U CN 221121119 U CN221121119 U CN 221121119U
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Abstract
The utility model belongs to a dual seal structure of cavity for stop valve, concretely relates to be applicable to high temperature gas cooled reactor nuclear level helium stop valve's dual seal structure of cavity and use stop valve of this structure that satisfies low leakage rate requirement. The utility model elaborates the structural feature of this kind of cavity dual seal design for stop valve. The valve body and the compression ring of the sealing structure of the middle cavity of the stop valve under the helium working condition and the two leakage channels of the compression ring and the valve cover are respectively provided with a metal C-shaped ring, a constant stress gasket and a corrugated pipe to form double sealing, so that the sealing structure of the middle cavity of the stop valve has good sealing performance, and the higher sealing requirement of the high-temperature gas cooled reactor on the sealing structure of the middle cavity of the nuclear-grade helium stop valve is met. Simultaneously, through this novel, the dual seal structure of stop valve middle chamber can also be popularized and applied to other similar valves that have low leakage rate requirement to the sealed sealing of middle chamber.
Description
Technical Field
The utility model belongs to a dual seal structure of cavity for stop valve, concretely relates to be applicable to high temperature gas cooled reactor nuclear level helium stop valve's dual seal structure of cavity and use stop valve of this structure that satisfies low leakage rate requirement.
Background
The nuclear grade helium stop valve is used as a pressure-bearing device with wide range and large quantity in a primary loop of the high-temperature gas cooled reactor, is connected with a plurality of process systems, plays an important role in ensuring the normal and stable operation and safety of the high-temperature gas cooled reactor, and belongs to key equipment in the high-temperature gas cooled reactor. However, the medium helium of the high-temperature gas cooled reactor nuclear grade helium stop valve can have certain radiation as a loop coolant, if the medium helium leaks outside, the environment is polluted, and certain harm is caused to operators on site, and because the helium has strong permeability, the high requirement is put forward on the sealing performance of the cavity sealing structure of the helium stop valve. And because the high-temperature gas cooled reactor belongs to a four-generation nuclear reactor type, higher requirements are provided for the sealing performance of a middle cavity sealing structure of a nuclear grade helium stop valve, the middle cavity sealing structure of the traditional stop valve can play a certain sealing effect, but the sealing leakage rate requirements of the high-temperature gas cooled reactor for the middle cavity sealing structure of the nuclear grade helium stop valve cannot be met, and because the high-temperature gas cooled reactor has more nuclear grade helium stop valves in a first loop, the sealing performance of the cavity sealing structure cannot meet the requirements, the leakage rate far exceeds the system requirements, so that the stable operation and the safety of the high-temperature gas cooled reactor are influenced.
Disclosure of utility model
The utility model aims at providing a satisfy the dual seal structure of stop valve middle chamber of low leakage rate requirement under high temperature high pressure helium operating mode, metal C circle and constant stress gasket + bellows's dual seal structure promptly.
Realize the structural technology of this novel purpose: the utility model provides a dual seal structure of cavity for stop valve, wherein, includes the clamping ring, and the clamping ring cross-section is cavity ring type part, and the clamping ring bottom surface is provided with the boss, and clamping ring boss top sets up constant stress gasket, and clamping ring boss below sets up metal C type circle.
The middle cavity double sealing structure for the stop valve is characterized in that the metal C-shaped ring is provided with the groove.
The hollow cavity double sealing structure for the stop valve has the advantages that the width of the annular groove is enough to ensure that the metal C-shaped ring can be normally placed in the annular groove, the roughness of more than Ra0.8 can be obtained by the bottom plane of the groove through a grinding means, the depth of the annular groove is determined according to the wire diameter of the metal C-shaped ring, and the compression amount of the metal C-shaped ring is ensured, so that the metal C-shaped ring has good rebound performance.
The middle cavity double sealing structure for the stop valve is characterized in that the surface roughness Ra of the groove on the metal C-shaped ring and the bottom of the pressing ring is smaller than Ra0.8.
The middle cavity double sealing structure for the stop valve is characterized in that the constant stress gasket is of a double-ring structure, the inner ring is made of metal, and the outer ring is made of graphite.
The stop valve with the middle cavity double sealing structure is characterized in that the middle cavity double sealing structure is arranged between the valve body and the valve cover, and the compression ring is sleeved on the valve rod.
The stop valve with the middle cavity double sealing structure is characterized in that the corrugated pipe is sleeved outside the valve rod, and the compression ring is sleeved on the corrugated pipe.
The novel remarkable effect is: the sealing performance of the valve middle cavity sealing structure is improved, and the possibility of failure of the middle cavity sealing is reduced, so that the higher sealing requirement of the high-temperature gas cooled reactor on the nuclear-grade helium stop valve middle cavity sealing structure is met.
Drawings
FIG. 1 is an assembly drawing of a double sealing structure of a middle cavity for a stop valve
FIG. 2 is a diagram showing the structure of a double sealing structure of a middle cavity for a stop valve
FIG. 3 is a diagram of a constant stress gasket construction
In the figure: 1. a valve body; 2. a bellows; 3. a metal C-shaped ring; 4. a compression ring; 5. a constant stress gasket; 6. a valve cover; 7. a valve stem; 8. a middle flange nut; 9. a middle flange stud;
Detailed Description
1. Middle cavity double sealing structure for stop valve
The assembly diagram of the middle cavity double sealing structure for the stop valve is shown in fig. 1.
The structure diagram of the middle cavity double sealing structure for the stop valve is shown in figure 2.
2. Structural feature of double sealing structure design of middle cavity
The double sealing of the middle cavity for the stop valve adopts a structure of combining a metal C-shaped ring and a constant stress gasket with a corrugated pipe. The utility model provides a helium operating mode stop valve cavity seal structure exists including two leakage path between valve body and the clamping ring and between clamping ring and the valve gap, and its concrete theory of operation is as follows:
When helium is filled in the valve cavity, the sealing between the valve body and the compression ring is ensured by the metal C-shaped ring, the annular groove for placing the metal C-shaped ring on the valve body is designed in detail, the width of the annular groove needs to ensure that the metal C-shaped ring can be normally placed in the annular groove, and enough width is ensured to ensure that the bottom plane of the groove can acquire the roughness of Ra0.8 or more through a grinding means, the depth of the annular groove is determined according to the wire diameter of the metal C-shaped ring, and the depth needs to ensure the compression amount of the metal C-shaped ring so that the metal C-shaped ring has good rebound performance, and the compression amount and the rebound amount of the metal C-shaped ring are effectively ensured by applying the fastening torque of the flange studs; meanwhile, surface roughness Ra of the bottom of the valve body groove and the bottom of the pressing ring, which are in contact with the metal C-shaped ring to form sealing, is ensured (the metal C-shaped ring is respectively in contact with the bottom plane of the valve body annular groove and the bottom plane of the pressing ring to form sealing surfaces, so that the roughness of the bottom plane of the valve body annular groove and the bottom plane of the pressing ring is required to be ensured to be less than Ra0.8 in order to ensure that the metal C-shaped ring has good sealing effect, and the leakage rate index requirement is met; the seal between valve gap and the clamping ring is guaranteed by constant stress gasket and bellows, when the valve cavity is full of helium, medium helium is guaranteed by the bellows at first and seals, and constant stress gasket plays sealed effect as the second seal, and constant stress gasket adopts the structure that inner circle metal + outer lane graphite combined together (figure 3), and inner circle metal mainly prevents graphite excessive pressure and leads to sealing gasket inefficacy, and outer lane graphite can play reserve sealed effect. Thus forming a double sealing structure of the middle cavity for the stop valve.
Claims (7)
1. The utility model provides a cavity dual seal structure for stop valve which characterized in that: including clamping ring (4), clamping ring (4) cross-section is cavity ring type part, and clamping ring (4) bottom surface is provided with the boss, and clamping ring (4) boss top sets up constant stress gasket (5), and clamping ring (4) boss below sets up metal C type circle (3).
2. The valve-use middle-chamber double seal structure according to claim 1, wherein: a groove is arranged on the metal C-shaped ring (3).
3. A valve-use middle-chamber double seal structure according to claim 2, characterized in that: the groove on the metal C-shaped ring (3) is provided with a width required to ensure that the metal C-shaped ring can be normally placed in the groove, and a sufficient width is ensured to ensure that the bottom plane of the groove can acquire roughness above Ra0.8 through a grinding means, the depth of the annular groove is determined according to the wire diameter of the metal C-shaped ring, and the depth is required to ensure the compression amount of the metal C-shaped ring so that the metal C-shaped ring has good rebound performance.
4. A valve-use middle-chamber double seal structure according to claim 3, wherein: the surface roughness Ra of the groove on the metal C-shaped ring (3) and the bottom of the pressing ring is smaller than Ra0.8.
5. The double sealing structure of a middle cavity for a stop valve as claimed in claim 4, wherein: the constant stress gasket (5) is of a double-ring structure, the inner ring is made of metal, and the outer ring is made of graphite.
6. A stop valve that uses cavity dual seal structure, its characterized in that: the middle cavity double sealing structure is arranged between the valve body (1) and the valve cover (6), and the compression ring (4) is sleeved on the valve rod (7).
7. A shut-off valve using a double seal structure for a middle chamber as set forth in claim 6, wherein: the valve rod (7) is sleeved with the corrugated pipe (2), and the compression ring (4) is sleeved on the corrugated pipe (2).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323100671.9U CN221121119U (en) | 2023-11-17 | 2023-11-17 | A middle cavity double sealing structure for a stop valve and a stop valve using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202323100671.9U CN221121119U (en) | 2023-11-17 | 2023-11-17 | A middle cavity double sealing structure for a stop valve and a stop valve using the same |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN221121119U true CN221121119U (en) | 2024-06-11 |
Family
ID=91374443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202323100671.9U Active CN221121119U (en) | 2023-11-17 | 2023-11-17 | A middle cavity double sealing structure for a stop valve and a stop valve using the same |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN221121119U (en) |
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2023
- 2023-11-17 CN CN202323100671.9U patent/CN221121119U/en active Active
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