CN209495016U - A kind of heavy caliber sodium valves dynamic sealing assembly - Google Patents
A kind of heavy caliber sodium valves dynamic sealing assembly Download PDFInfo
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- CN209495016U CN209495016U CN201822114118.3U CN201822114118U CN209495016U CN 209495016 U CN209495016 U CN 209495016U CN 201822114118 U CN201822114118 U CN 201822114118U CN 209495016 U CN209495016 U CN 209495016U
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- dynamic sealing
- sealing assembly
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Abstract
This field belongs to reactor engineering field, in particular to a kind of heavy caliber sodium valves dynamic sealing assembly, including valve body, valve deck, valve rod, flashboard, and freezing sealed chamber is formed between valve deck and valve rod；Valve deck neck is provided with fin；Gas access is provided on valve deck neck；Packing seal is used between valve rod and valve deck, and is compressed with gland；Valve body is provided with fluid inlet and fluid outlet；Valve body is fixedly connected with valve deck, and cavity is formed between valve body and valve deck；Valve deck upper end is provided with pressure sensor；To provide a kind of heavy caliber sodium valves dynamic sealing assembly that can be realized on-line monitoring, ensure sodium valves safe operation.
Description
Technical field
This field belongs to reactor engineering field, in particular to a kind of heavy caliber sodium valves dynamic sealing assembly.
Background technique
It is usually the front and back that steam generator module is arranged in as closedown structure that fast reactor, which uses heavy caliber sodium valves, when steam is sent out
Raw device seal failure can promptly isolate steam generator, avoid the further expansion of accident when sodium-water reaction accident occurs,
Protect the safe operation of steam generator and secondary circuit.
The characteristics of fast reactor sodium system is high-temperature low-pressure, and the sodium in system is extremely active, encounters air meeting rapid oxidation, encounters
Water meeting vigorous combustion, so the sodium valves for any pattern is all not allow for micro leakage.
Dielectric leakage by gap between valve deck and valve rod is leakage.It will affect pipeline when exposed serious and equipment be normal
Operation, especially to active medium, leakage causes radioactive pollution, threatens to personal safety.
" dynamic sealing " of so-called valve refers to the structure for preventing from leaking at valve rod.
Movable sealing structure for nuclear grade valve has a filler and two kinds of bellows, and for sodium valves, a kind of more freezing
Sealing structure.
Packing seal is a kind of most common sealing structure of valve, and filling has the close of certain elasticity in valve deck stuffing-box
Packing material, is compressed with gland, makes to be in close contact on the inside of filler and stem exterior surface and stuffing-box, and form certain sealing
Than pressure, medium is prevented to leak outside to realize.But because packing seal is difficult to accomplish zero leakage, so seldom used in nuclear power field,
Sodium valves especially high to seal request.
Sylphon seal is that a kind of sealing structure of valve dynamic sealing is realized using bellows component, in such structure
In, one end of bellows is weldingly fixed on valve deck or valve seat, and the other end is welded on valve rod, and valve rod, which moves up and down, drives ripple
Pipe compression stretches, and then prevents the leakage of valve, can accomplish zero leakage, be well suited in sealing requirements such as space flight, nuclear powers
High field uses.
But bellows is used to there is following deficiency as the movable sealing structure of sodium valves: the compression travel of a. bellows should be
Within the scope of its installation length 10%-15%, but for gate valve, stroke is longer, especially heavy-caliber gate valve, this problem
It is more prominent, it is often necessary to which that several bellowss compose in series, and are possible to the needs for meeting flashboard unlatching, but with bellows
Several increases, reliability will certainly be reduced significantly.B. fluid, which passes through valve, may cause the vibration of bellows components, this
Vibration can be such that bellows is chronically under the action of pulsating stress, easily cause fatigue rupture, cause to leak, this can make valve
Service life substantially reduces.C. it could be operated after must be heated to assigned temperature using the sodium valves of sylphon seal, if cold in system
Operation valve is possible to that bellows can be damaged when solidifying, and this clearly increases the possibility that system operation energy consumption and personel accident occur
Property.
At present i.e. after sylphon seal, technical staff proposes a kind of utilization low-melting feature of sodium medium itself, leads to
Cross itself cooled and solidified of sodium medium to realize sodium valves dynamic sealing purpose, but once extraneous cooling condition be not achieved it is close
The case where envelope just will appear seal failure when requiring, and technical staff is for the seal shape using the movable sealing structure sodium valves at present
State cannot achieve real-time dynamic monitoring, to guarantee the safe operation of sodium valves.
Utility model content
(1) purpose of utility model
In order to overcome the deficiencies of the prior art, present disclose provides one kind can be realized on-line monitoring, ensures that sodium valves is transported safely
Capable heavy caliber sodium valves dynamic sealing assembly.
(2) technical solution
A kind of heavy caliber sodium valves dynamic sealing assembly, including valve body, valve deck, valve rod, flashboard, form cold between valve deck and valve rod
Freeze sealed chamber；Valve deck neck is provided with fin；Gas access is provided on valve deck neck；
Packing seal is used between valve rod and valve deck, and is compressed with gland；
Valve body is provided with fluid inlet and fluid outlet；Valve body is fixedly connected with valve deck, and is formed between valve body and valve deck
Cavity；
Valve deck upper end is provided with pressure sensor.
Freeze the radial dimension of sealed chamber are as follows: 0.5mm or 1mm or 1.5mm or 2mm or 2.5mm or 3mm.
Freeze sealed chamber top applying argon gas.
The thickness of fin are as follows: 5mm.
The spacing of fin are as follows: 10-13mm.
Sensor is gas pressure sensor.
(3) beneficial effect
The dynamic sealing assembly of the disclosure is full of argon gas by forming freezing sealed chamber top between valve deck and valve rod,
Gas pressure sensor is set on valve deck top, realizes and sodium valves dynamic sealing is monitored on-line；It is effective in sodium valves movable sealing structure
Period, freezing sealed chamber top argon pressure keeps stablizing, similarly if the gas pressure of valve deck upper gas sensor measurement
Power is stablized, then dynamic sealing is effective, if the gas pressure of gas sensor side amount quickly changes, illustrates that dynamic sealing fails, both needed
It will be using related remedial measure.
The dynamic sealing assembly of the disclosure, calculate devise freezing sealed chamber radial dimension and radiating fin quantity,
Thickness, spacing parameter substantially increase the reliability of dynamic sealing.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of heavy caliber sodium valves dynamic sealing assembly；
Wherein 1 is 9 gland of gas access 2 valve deck, 3 fin, 4 valve rod, 5 valve body, 6 flashboard, 7 filler, 8 sensor
Specific embodiment
In order to better illustrate the technical solution of the disclosure, it is described in detail by the following specific embodiment:
A kind of heavy caliber sodium valves dynamic sealing assembly, the sodium dielectric valve of DN300, including valve body 5, valve deck 2, valve rod 4, flashboard 6,
Between valve deck 2 and valve rod 4 formed freezing sealed chamber, freeze sealed chamber radial dimension be 0.5mm or 1mm or 1.5mm or
2mm or 2.5mm or 3mm；2 neck of valve deck is provided with fin 3；The quantity of fin are as follows: 18, thickness are as follows: 5mm, spacing are as follows: 10-
13mm not only ensure that fin had sufficient heat-dissipating space using the spacing of 10-13mm but also guarantee that the height of neck of valve deck 2 will not
It is excessive；The gas access 1 of argon gas is provided on 2 neck of valve deck；2 upper end of valve deck is provided with gas pressure sensor 8；Valve rod 4 with
Packing seal is used between valve deck 2, and is compressed with gland 9；Valve body 5 is provided with sodium medium inlet and sodium media outlet；Valve
Body 5 is fixedly connected with valve deck 2, and forms cavity between valve body 5 and valve deck 2.
As shown in Figure 1, the sodium valves containing the dynamic sealing assembly is in close state, when valve rod 4 drives flashboard 6 to moving up
Dynamic, sodium valves is gradually opened, and the sodium medium in liquid condition flows into sodium media outlet from the sodium medium inlet of sodium valves, while sodium is situated between
Matter also flow into the chamber formed between valve body 5 and valve deck 2 and freezing sealed chamber, when liquid condition sodium media collapse argon gas by
When gradually rising, the fin of 2 outside portion of valve deck is by natural convection air to the sodium medium of the freezing indoor liquid condition of seal chamber
It is cooled down, solidifies sodium medium gradually, formed sodium sealing plug, realize the dynamic sealing of Liquid Sodium, it is close in freezing later at this time
The argon pressure for sealing chamber top, which is in, to be stablized, and dynamic sealing is in effective status；Utilize the gas pressure sensor on 2 top of valve deck
Real time on-line monitoring is carried out to argon pressure, to guarantee that dynamic sealing is in effective status.If sodium valves is in use, argon gas
Pressure there is cataclysm, illustrate that dynamic sealing fails, at this time should be in time using remedying state.
Obviously, those skilled in the art can carry out various modification and variations without departing from the essence of the disclosure to the disclosure
Mind and range.If in this way, these modifications and variations of the disclosure are belonged to the model of disclosure claim and its equivalent technology
Within enclosing, then the disclosure is also intended to include these modifications and variations.Above-described embodiment or embodiment are only to the disclosure
For example, the disclosure can also be implemented with other ad hoc fashions or other particular form, without departing from the disclosure
Main idea or substantive characteristics.Therefore, the embodiment of description is regarded as illustrative and non-limiting in any way.This
Scope of disclosure should be illustrated that any variation equivalent with the intention and range of claim also should include by appended claims
Within the scope of this disclosure.
Claims (6)
1. a kind of heavy caliber sodium valves dynamic sealing assembly, including valve body (5), valve deck (2), valve rod (4), flashboard (6), the valve deck
(2) freezing sealed chamber is formed between valve rod (4)；Valve deck (2) neck is provided with fin (3)；Valve deck (2) neck
On be provided with gas access (1)；
Packing seal is used between the valve rod (4) and valve deck (2), and is compressed with gland (9)；
The valve body (5) is provided with fluid inlet and fluid outlet；The valve body (5) is fixedly connected with valve deck (2), and valve body
(5) cavity is formed between valve deck (2)；
It is characterized in that, valve deck (2) upper end is provided with sensor (8).
2. a kind of heavy caliber sodium valves dynamic sealing assembly according to claim 1, which is characterized in that the freezing sealed chamber
Radial dimension are as follows: 0.5mm or 1mm or 1.5mm or 2mm or 2.5mm or 3mm.
3. a kind of heavy caliber sodium valves dynamic sealing assembly according to claim 1, which is characterized in that the freezing sealed chamber
Top applying argon gas.
4. a kind of heavy caliber sodium valves dynamic sealing assembly according to claim 1, which is characterized in that the thickness of the fin (3)
Degree are as follows: 5mm.
5. a kind of heavy caliber sodium valves dynamic sealing assembly according to claim 1, which is characterized in that between the fin (3)
Away from are as follows: 10-13mm.
6. a kind of heavy caliber sodium valves dynamic sealing assembly according to claim 1, which is characterized in that the sensor (8) is
Gas pressure sensor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822114118.3U CN209495016U (en) | 2018-12-17 | 2018-12-17 | A kind of heavy caliber sodium valves dynamic sealing assembly |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201822114118.3U CN209495016U (en) | 2018-12-17 | 2018-12-17 | A kind of heavy caliber sodium valves dynamic sealing assembly |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209495016U true CN209495016U (en) | 2019-10-15 |
Family
ID=68153175
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201822114118.3U Active CN209495016U (en) | 2018-12-17 | 2018-12-17 | A kind of heavy caliber sodium valves dynamic sealing assembly |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN209495016U (en) |
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2018
- 2018-12-17 CN CN201822114118.3U patent/CN209495016U/en active Active
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