CN115312214A - Self-resetting type anti-tilt swing CIS water inlet heat preservation valve device - Google Patents
Self-resetting type anti-tilt swing CIS water inlet heat preservation valve device Download PDFInfo
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- CN115312214A CN115312214A CN202211127411.8A CN202211127411A CN115312214A CN 115312214 A CN115312214 A CN 115312214A CN 202211127411 A CN202211127411 A CN 202211127411A CN 115312214 A CN115312214 A CN 115312214A
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 119
- 238000004321 preservation Methods 0.000 title claims abstract description 36
- 238000009413 insulation Methods 0.000 claims abstract description 26
- 229910000831 Steel Inorganic materials 0.000 claims description 10
- 239000010959 steel Substances 0.000 claims description 10
- 239000000463 material Substances 0.000 claims description 4
- 230000000694 effects Effects 0.000 abstract description 11
- 239000000498 cooling water Substances 0.000 abstract description 9
- 239000012530 fluid Substances 0.000 abstract description 4
- 230000000903 blocking effect Effects 0.000 abstract description 2
- 230000005484 gravity Effects 0.000 description 5
- 230000017525 heat dissipation Effects 0.000 description 5
- 238000000034 method Methods 0.000 description 4
- 238000009423 ventilation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000243 solution Substances 0.000 description 2
- 238000001816 cooling Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
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Classifications
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C11/00—Shielding structurally associated with the reactor
- G21C11/08—Thermal shields; Thermal linings, i.e. for dissipating heat from gamma radiation which would otherwise heat an outer biological shield ; Thermal insulation
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C13/00—Pressure vessels; Containment vessels; Containment in general
- G21C13/02—Details
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/02—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices
- G21C15/12—Arrangements or disposition of passages in which heat is transferred to the coolant; Coolant flow control devices from pressure vessel; from containment vessel
-
- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21C—NUCLEAR REACTORS
- G21C15/00—Cooling arrangements within the pressure vessel containing the core; Selection of specific coolants
- G21C15/18—Emergency cooling arrangements; Removing shut-down heat
Abstract
The invention belongs to the technical field of reactor structure design, and particularly relates to a self-resetting anti-tilting CIS water inlet swing heat-insulation valve device. The heat preservation valve device designed by the invention can realize the self-resetting function under the condition that the carrier tilts and swings through the design of the end surface of the pipeline and the hinge, keep the blocking state of the pipeline and guarantee the heat preservation effect during operation; and under the working condition that pipeline fluid needs to pass through, the corresponding opening function can be realized. The excessive conditions of the temperature and the heat dissipating capacity of the vapor-water outlet pipe of the CIS annular cavity are avoided, and the influence on surrounding equipment is avoided. The inclined plane angle of the water inlet pipe is designed to be larger than the limit inclined working condition angle of the carrier so as to realize the function of inclination and swing resistance. After the heat preservation valve is opened by mistake, the heat preservation valve can be closed again, and the convection influence is greatly reduced or eliminated. Under severe working conditions, the cooling water can open the valve and flow into the inner annular cavity from the water inlet pipe.
Description
Technical Field
The invention belongs to the technical field of reactor structure design, and particularly relates to a self-resetting anti-inclination swinging CIS water inlet heat-insulation valve device.
Background
The Reactor Pressure Vessel (RPV) heat-insulating layer is arranged outside the RPV and contains the whole RPV, and has the functions of reducing the heat loss of the reactor, reducing the environmental temperature, reducing the temperature difference between the inner wall surface and the outer wall surface of the RPV and ensuring the safe operation of the reactor; according to the requirement of the safety function of a new generation of reactor cavity water injection cooling system (CIS), the CIS related components need to be arranged by relying on an RPV heat insulation layer, and the method is as follows: the water inlet assembly is arranged on the lower portion of the RPV heat-insulating layer, the steam-water outlet assembly is arranged on the upper portion of the RPV heat-insulating layer, when the reactor core is fused under the severe accident condition, reactor cavity cooling water enters an annular cavity between the RPV and the heat-insulating layer through the water inlet assembly on the lower portion of the heat-insulating layer, generated steam-water mixture is discharged through the steam-water outlet assembly on the upper portion, the RPV is cooled externally, and therefore the consequences caused by the fusion accident of the reactor core are relieved.
In the prior CIS technology, under the condition that a water inlet and a steam-water outlet heat-insulation valve device are not arranged, because the direction of the CIS water inlet cannot realize ventilation complete separation, air can enter a CIS annular cavity through the CIS water inlet, the high temperature of an RPV (remote procedure vector) can heat the air in the CIS annular cavity, the heated air flows upwards along the axial direction and is gathered at a CIS steam-water outlet, the difference between the temperature inside and outside the CIS steam-water outlet causes pressure difference, and the air finally passes through a unique outlet of the CIS annular cavity, namely the steam-water outlet escapes. At the moment, the CIS annular cavity forms air convection, so that a chimney effect is caused, the temperature and the heat dissipation capacity at the position of a CIS steam-water outlet pipe exceed the standard, surrounding equipment is influenced, and meanwhile, the heat preservation effect in operation is influenced to a certain extent. In the existing RPV heat-insulating layers provided with CIS water inlet and steam-water outlet heat-insulating valve devices, the water inlet heat-insulating valve can not be suitable for the working conditions of short-time inclination, swinging, vibration and jolt vibration of a heat-insulating layer structure carrier, and the heat-insulating and shielding effects on the water inlet and the steam-water outlet under all the working conditions can not be realized.
Disclosure of Invention
In order to solve the problem that the water inlet heat-insulating valve in the prior CIS technology cannot be suitable for the working conditions of short-time inclination, swinging, vibration and jolt vibration of a heat-insulating layer structure carrier, the invention provides a self-reset type inclination and swing resistant CIS water inlet heat-insulating valve device, and aims to realize complete ventilation obstruction of the CIS water inlet on the premise of not influencing injected cooling water, greatly relieve the air convection condition, greatly reduce the chimney effect and avoid the condition of heat overrun. Meanwhile, the device is suitable for the working conditions of short-time inclination, swinging, vibration and jolt vibration of the heat-insulating layer structure carrier, the heat-insulating valve of the water inlet can be closed again, and the influence of heat convection is greatly reduced or eliminated.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a self-reset type anti-tilt-swing CIS water inlet heat preservation valve device comprises a CIS water inlet pipe fitting and a water inlet heat preservation valve, wherein the CIS water inlet pipe fitting is horizontally arranged and is provided with an upward-tilted end opening; the water inlet heat preservation valve closes the end opening of the CIS water inlet pipe fitting, and the top of the water inlet heat preservation valve is hinged to a mounting point. According to the invention, the self-reset type anti-inclination and swing heat preservation valve device is designed, and the water inlet pipe is designed to be at an inclined angle, so that the anti-inclination and swing function of the valve device under the extreme inclination working condition of a carrier is realized. The heat-preserving valve can be closed again after being opened by mistake, so that the convection influence is greatly reduced or eliminated. Meanwhile, under the condition of serious working conditions, the valve can be opened by cooling water to flow into the inner annular cavity from the water inlet pipe.
Preferably, the CIS water inlet pipe fitting penetrates through the RPV heat insulation layer, and the end opening is positioned in a flow passage cavity between the RPV heat insulation layer and the outer wall of the pressure vessel.
Preferably, the RPV heat-insulating layer is supported and fixed by an RPV supporting frame.
As a preferred scheme, a runner steel lining plate is arranged on one side of the runner cavity of the RPV heat-insulating layer.
As a preferred scheme, the water inlet heat-insulating valve is installed on the runner steel lining plate through a hinge, and the installation point is located above the CIS water inlet pipe fitting.
As a preferred scheme, the water inlet heat-insulating valve is made of a material with density higher than that of water.
Preferably, the heat-insulating valve at the water inlet is made of steel.
Preferably, the inclination angle of the end opening of the CIS water inlet pipe fitting is larger than the limit inclination working condition angle of the carrier.
Preferably, the opening of the end part of the pipe fitting of the CIS water inlet has an inclination angle interval of 30-60 degrees.
Preferably, the inclination angle of the end opening of the CIS water inlet pipe fitting is 45 degrees.
In summary, compared with the prior art, the invention has the following advantages and beneficial effects: according to the invention, the self-reset type anti-inclination swinging CIS water inlet heat-insulation valve device is used for completely covering the CIS water inlet pipe orifice under the normal operation condition of a reactor with a CIS system. The invention greatly relieves the convection condition between the RPV and the annular cavity of the heat-insulating layer and the outside air, and greatly reduces the occurrence of chimney effect, thereby avoiding the over-standard condition of the temperature and the heat dissipation capacity at the CIS steam-water outlet and avoiding the influence on the surrounding equipment. Under the working conditions of short-time inclination, swinging, vibration, jolt vibration and the like, the inclination angle of the end part of the water inlet pipe fitting is designed to be larger than the limit inclination working condition angle of the carrier, so that the inclination and swing resisting function of the water inlet pipe fitting is realized. And the heat preservation valve is connected with the lining plate through a hinge, so that the self-resetting function under the condition of inclined swinging can be realized by utilizing the gravity of the heat preservation valve under the condition of mistaken opening of the heat preservation valve. Under the condition of serious accident, the CIS cooling water can open the water inlet valve and flow into the inner annular cavity from the inlet pipe fitting.
Drawings
The accompanying drawings, which are included to provide a further understanding of the embodiments of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of a self-resetting anti-tilt swing thermal insulation valve device.
Reference numbers and corresponding part names: 1- -RPV insulation layer; 2 — an RPV support frame; 3- -CIS water inlet pipe fitting; 4-runner steel lining plate; 5- -water inlet insulation valve; 6- -hinge.
Detailed Description
To make the objects, technical solutions and advantages of the present invention more apparent, the following detailed description of the principles, features and the like of the present invention is provided in conjunction with the examples and the accompanying drawings, and the exemplary embodiments and the description thereof are only used for explaining the present invention and are not used to limit the protection scope of the present invention.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. However, it will be apparent to one of ordinary skill in the art that: it is not necessary to employ these specific details to practice the present invention. In other instances, well-known structures, circuits, materials, or methods have not been described in detail in order to avoid obscuring the present invention.
Throughout the description, references to "one embodiment," "an embodiment," "one example," or "an example" mean: the particular features, structures, or characteristics described in connection with the embodiment or example are included in at least one embodiment of the invention. Thus, the appearances of the phrase "one embodiment," "an embodiment," "one example" or "an example" in various places throughout this specification are not necessarily all referring to the same embodiment or example. Furthermore, the particular features, structures, or characteristics may be combined in any suitable combination and/or sub-combination in one or more embodiments or examples. Further, those of ordinary skill in the art will appreciate that the illustrations provided herein are for illustrative purposes and are not necessarily drawn to scale. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The following discloses many different embodiments or examples for implementing the subject technology described. The following describes particular embodiments of one or more arrangements of features for simplicity of disclosure, but the illustrated embodiments are not intended to be limiting of the present disclosure, and the first and second features set forth in the following description may be combined to include embodiments that are directly connected, or may form additional features, and further, may include the use of one or more additional intervening features to indirectly connect or combine the first and second features to each other such that the first and second features may not be directly connected.
In the description of the present invention, it is to be understood that the terms "front", "rear", "left", "right", "upper", "lower", "vertical", "horizontal", "top", "bottom", "high", "low", "inner", "outer", "center", "length", "peripheral side", "circumferential" and the like indicate orientations or positional relationships based on those shown in the drawings, and are used merely for convenience of description and for simplicity of description, and do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed in a particular orientation, and be operated, and therefore should not be considered as limiting the scope of the invention.
In the description of the present specification, "a plurality" means at least two, e.g., two, three, etc., unless explicitly defined otherwise.
The terms used in the present specification are those general terms currently widely used in the art in consideration of functions related to the present disclosure, but they may be changed according to the intention of a person having ordinary skill in the art, precedent, or new technology in the art. Also, specific terms may be selected by the applicant, and in this case, their detailed meanings will be described in the detailed description of the present disclosure. Therefore, the terms used in the specification should not be construed as simple names but based on the meanings of the terms and the overall description of the present disclosure.
Flowcharts or text are used in this specification to illustrate operational steps performed in accordance with embodiments of the present application. It should be understood that the operational steps in the embodiments of the present application are not necessarily performed in the exact order recited. Rather, the various steps may be processed in reverse order or simultaneously, as desired. Meanwhile, other operations may be added to or removed from these processes.
In order to solve the problem that the water inlet heat-insulating valve in the prior CIS technology cannot be suitable for the working conditions of short-time inclination, swinging, vibration and jolt vibration of a heat-insulating layer structure carrier, the invention provides a self-reset type inclination and swing resistant CIS water inlet heat-insulating valve device, and aims to realize complete ventilation obstruction of the CIS water inlet on the premise of not influencing injected cooling water, greatly relieve the air convection condition, greatly reduce the chimney effect and avoid the condition of heat overrun. Simultaneously, the device is suitable for the working conditions of short-time inclination, swinging, vibration and jolt vibration of the carrier of the heat-insulating layer structure, ensures that the heat-insulating valve of the water inlet can be closed again, and greatly reduces or eliminates the influence of heat convection.
According to the self-resetting type anti-inclination swinging heat preservation valve device, the overproof conditions of the temperature and the heat dissipation capacity of the steam-water outlet pipe of the CIS annular cavity are avoided, and the influence on surrounding equipment is avoided. The inclined angle of the water inlet pipe is designed to be larger than the limit inclined working condition angle of the carrier, so that the function of resisting inclined swing is realized. After the heat preservation valve is opened by mistake, the heat preservation valve can be closed again, and the convection influence is greatly reduced or eliminated. Under severe working conditions, the cooling water can open the valve and flow into the inner annular cavity from the water inlet pipe.
To achieve the above object, the present invention is realized by the following specific embodiments:
a self-reset type anti-tilt and anti-swing CIS water inlet heat preservation valve device is shown in figure 1 and comprises a CIS water inlet pipe 3 and a water inlet heat preservation valve 5, wherein the CIS water inlet pipe 3 is horizontally arranged and is provided with an end opening which is tilted upwards; the end opening of the CIS water inlet pipe fitting 3 is closed by the water inlet heat preservation valve 5, and the top of the water inlet heat preservation valve 5 is hinged to a mounting point.
The water inlet of the RPV heat-insulating layer 1 is provided with a heat-insulating valve device, and the appearance diameter of the heat-insulating valve 5 is larger than the outer diameter of the water inlet pipe fitting 3, so that the water inlet is completely covered. Under normal working conditions, the heat-insulating valve 5 keeps the water inlet pipe mouth in a closed state, relieves the phenomenon of air convection, greatly reduces the occurrence of chimney effect, and avoids the overproof conditions of temperature and heat dissipation capacity at the steam-water outlet pipe of the CIS annular cavity. Meanwhile, cooling water needs to be injected under the working condition of a serious accident, and when CIS fluid passes through the water inlet pipe fitting 3, the heat-insulating valve 5 can achieve a corresponding opening function to ensure that the CIS fluid is smooth.
When the carrier of the heat preservation layer inclines, swings, vibrates and vibrates, the angle of the inclined surface of the water inlet pipe fitting 3 is larger than the limited inclination working condition angle of the carrier, the vertical state is maintained by means of self gravity relatively, and the heat preservation valve can realize the anti-inclination swinging function of the heat preservation valve through the self gravity. When 5 mistake open at heat preservation valve, heat preservation valve 5 can make the passageway of water inlet obtain hiding again through self gravity to realize the self-reset function under the condition that inclines and sways, close heat preservation valve 5 again, the heat preservation effect of water inlet department under the guarantee all kinds of operating condition realizes its anti-inclination function of swaying under the operating mode such as slope in short time, sway, vibration, top shake.
In an alternative embodiment, as shown in fig. 1, the CIS water inlet pipe fitting 3 extends through the RPV insulation 1 and opens at the end into the annulus between the RPV insulation 1 and the outer wall of the pressure vessel. In an alternative embodiment, the RPV insulation 1 is supported and secured by an RPV support frame 2. In an optional embodiment, a runner steel lining plate 4 is arranged on one side of the runner cavity of the RPV insulating layer 1. In an alternative embodiment, the water inlet thermal insulation valve 5 is mounted on the runner steel liner plate 4 through a hinge 6, and the mounting point is positioned above the CIS water inlet pipe fitting 3. The heat preservation valve device designed in the embodiment can realize the self-resetting function under the condition that the carrier tilts and swings through the design of the end face of the pipeline and the hinge, keep the blocking state of the pipeline and guarantee the heat preservation effect during operation; and under the working condition that pipeline fluid needs to pass through, the corresponding opening function can be realized.
In an alternative embodiment, as shown in fig. 1, the water inlet thermal insulation valve 5 is made of a material with density higher than that of water. In an alternative embodiment, the water inlet insulating shutter 5 is made of steel.
In an alternative embodiment, as shown in fig. 1, the inclination angle of the end opening of the CIS water inlet pipe 3 is larger than the limit inclination working angle of the carrier. In an alternative embodiment, the inclination angle of the end opening of the CIS water inlet pipe member 3 is in the range of 30 ° to 60 °. In an alternative embodiment, the angle of inclination of the end opening of the CIS water inlet tube 3 is 45 °.
In summary, compared with the prior art, the invention has the following advantages and beneficial effects: according to the invention, the self-reset type anti-inclination swinging CIS water inlet heat-insulation valve device is used for completely covering the CIS water inlet pipe orifice under the normal operation condition of a reactor with a CIS system. The invention greatly relieves the convection condition between the RPV and the annular cavity of the heat-insulating layer and the outside air, and greatly reduces the occurrence of chimney effect, thereby avoiding the over-standard condition of the temperature and the heat dissipation capacity at the CIS steam-water outlet and avoiding the influence on the surrounding equipment. Under the working conditions of short-time inclination, swinging, vibration, jolt vibration and the like, the inclination angle of the end part of the water inlet pipe fitting is designed to be larger than the limit inclination working condition angle of the carrier, so that the inclination and swing resisting function of the water inlet pipe fitting is realized. And the heat preservation valve is connected with the lining plate through a hinge, so that the self-resetting function under the condition of inclined swinging can be realized by utilizing the gravity of the heat preservation valve under the condition of mistaken opening of the heat preservation valve. Under severe accident conditions, the CIS cooling water can open the water inlet valve and flow into the inner annular cavity from the inlet pipe fitting.
The above-mentioned embodiments, objects, technical solutions and advantages of the present invention are further described in detail, it should be understood that the above-mentioned embodiments are merely preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. The utility model provides a self-resetting formula's anti slope sways CIS water inlet heat preservation valve device, includes CIS water inlet pipe fitting (3) and water inlet heat preservation valve (5), its characterized in that: the CIS water inlet pipe (3) is horizontally arranged and has an end opening which is inclined upwards; the end opening of the CIS water inlet pipe fitting (3) is closed by the water inlet heat-insulating valve (5), and the top of the water inlet heat-insulating valve (5) is hinged to a mounting point.
2. The self-resetting anti-tilting-rocking CIS water inlet thermal insulation shutter device according to claim 1, characterized in that: the CIS water inlet pipe fitting (3) penetrates through the RPV heat insulation layer (1), and the end opening is positioned in an annular cavity between the RPV heat insulation layer (1) and the outer wall of the pressure vessel.
3. The self-resetting anti-tilting-rocking CIS water inlet thermal insulation shutter device according to claim 2, characterized in that: the RPV heat-insulating layer (1) is supported and fixed by an RPV supporting frame (2).
4. The self-resetting anti-tilting and rocking CIS water inlet thermal insulation shutter device as claimed in claim 2, wherein: and a runner steel lining plate (4) is arranged on one side of the runner cavity of the RPV heat-insulating layer (1).
5. The self-resetting anti-tilting and rocking CIS water inlet thermal insulation shutter device as claimed in claim 4, wherein: the water inlet heat-preservation valve (5) is arranged on the runner steel lining plate (4) through a hinge (6), and the mounting point is positioned above the CIS water inlet pipe fitting (3).
6. The self-resetting anti-tilting and rocking CIS water inlet thermal insulation shutter device as claimed in claim 1, wherein: the water inlet heat-insulating valve (5) is made of a material with density higher than that of water.
7. The self-resetting anti-tilting-rocking CIS water inlet thermal insulation shutter device of claim 6, characterized in that: the heat-insulating valve (5) at the water inlet is made of steel.
8. The self-resetting anti-tilting and rocking CIS water inlet thermal insulation shutter device as claimed in claim 1, wherein: the inclination angle of the end opening of the CIS water inlet pipe fitting (3) is larger than the limit inclination working condition angle of the carrier.
9. The self-resetting anti-sway CIS water inlet thermal trap apparatus of claim 8, further comprising: the inclination angle interval of the opening at the end part of the CIS water inlet pipe fitting (3) is 30-60 degrees.
10. The self-resetting anti-sway CIS water inlet thermal trap apparatus of claim 9, further comprising: the inclination angle of the end opening of the CIS water inlet pipe fitting (3) is 45 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211127411.8A CN115312214A (en) | 2022-09-16 | 2022-09-16 | Self-resetting type anti-tilt swing CIS water inlet heat preservation valve device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211127411.8A CN115312214A (en) | 2022-09-16 | 2022-09-16 | Self-resetting type anti-tilt swing CIS water inlet heat preservation valve device |
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| Publication Number | Publication Date |
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| CN115312214A true CN115312214A (en) | 2022-11-08 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211127411.8A Pending CN115312214A (en) | 2022-09-16 | 2022-09-16 | Self-resetting type anti-tilt swing CIS water inlet heat preservation valve device |
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| CN (1) | CN115312214A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080198960A1 (en) * | 2007-02-20 | 2008-08-21 | Keegan C Patrick | Nuclear reactor vessel fuel thermal insulating barrier |
| CN201367631Y (en) * | 2009-03-04 | 2009-12-23 | 夏小朋 | Odour avoidance valve |
| CN103474103A (en) * | 2012-06-08 | 2013-12-25 | 中国核动力研究设计院 | Metal insulation device capable of achieving external cooling of reactor pressure vessel |
| CN215888464U (en) * | 2021-07-22 | 2022-02-22 | 王燕 | Automatic odour-proof valve for sewer |
-
2022
- 2022-09-16 CN CN202211127411.8A patent/CN115312214A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20080198960A1 (en) * | 2007-02-20 | 2008-08-21 | Keegan C Patrick | Nuclear reactor vessel fuel thermal insulating barrier |
| CN201367631Y (en) * | 2009-03-04 | 2009-12-23 | 夏小朋 | Odour avoidance valve |
| CN103474103A (en) * | 2012-06-08 | 2013-12-25 | 中国核动力研究设计院 | Metal insulation device capable of achieving external cooling of reactor pressure vessel |
| CN215888464U (en) * | 2021-07-22 | 2022-02-22 | 王燕 | Automatic odour-proof valve for sewer |
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