CN112081964A - Fireproof check valve - Google Patents
Fireproof check valve Download PDFInfo
- Publication number
- CN112081964A CN112081964A CN202010423017.3A CN202010423017A CN112081964A CN 112081964 A CN112081964 A CN 112081964A CN 202010423017 A CN202010423017 A CN 202010423017A CN 112081964 A CN112081964 A CN 112081964A
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- China
- Prior art keywords
- exhaust
- valve plate
- valve
- port
- check valve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 239000000779 smoke Substances 0.000 claims abstract description 56
- 230000005484 gravity Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 230000002265 prevention Effects 0.000 claims description 3
- 230000009970 fire resistant effect Effects 0.000 claims 4
- 238000013022 venting Methods 0.000 claims 1
- 239000002184 metal Substances 0.000 description 22
- 230000004888 barrier function Effects 0.000 description 18
- 238000005219 brazing Methods 0.000 description 6
- 239000000945 filler Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 235000019504 cigarettes Nutrition 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 3
- 239000003546 flue gas Substances 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 239000011324 bead Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920000742 Cotton Polymers 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000001174 ascending effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
Images
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/02—Check valves with guided rigid valve members
- F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
- F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
- F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
- F16K17/383—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the valve comprising fusible, softening or meltable elements, e.g. used as link, blocking element, seal, closure plug
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/40—Safety valves; Equalising valves, e.g. pressure relief valves with a fracturing member, e.g. fracturing diaphragm, glass, fusible joint
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/02—Construction of housing; Use of materials therefor of lift valves
- F16K27/0209—Check valves or pivoted valves
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention relates to a fireproof check valve, which solves the problem that an exhaust valve plate seriously depends on a torsion spring to close an exhaust port. The fire check valve includes: the valve body is provided with an exhaust passage, and the exhaust passage is provided with an exhaust port and a smoke isolating port; the exhaust valve plate is movably arranged on the valve body and is used for opening or closing the exhaust port; the smoke isolating valve plate is movably arranged on the valve body and is used for opening or closing the smoke isolating port; the smoke isolating valve plate is provided with a locking position and an unlocking position, when the locking structure works, the smoke isolating valve plate is fixed at the locking position, and when the locking structure stops working, the smoke isolating valve plate moves to the unlocking position from the locking position to close the smoke isolating port; the exhaust port is obliquely arranged, and the exhaust valve plate is located above the exhaust port.
Description
Technical Field
The invention relates to a fireproof check valve.
Background
The fireproof check valve comprises a valve body, an exhaust valve block, a torsion spring and a connecting rod, wherein an exhaust passage is arranged on the valve body, an exhaust port is arranged on the exhaust passage, the upper end of the connecting rod is rotatably connected with the exhaust valve block, the lower end of the connecting rod is rotatably connected with the valve body, and the torsion spring drives the connecting rod to rotate relative to the valve body so as to drive the exhaust valve block to close the exhaust port.
The vertical setting of current gas vent, when the torsional spring loses elasticity or torsional spring elasticity is not enough, the gas vent will be difficult to close to the discharge gate valve block.
Disclosure of Invention
The invention aims to provide a fireproof check valve, which solves the problem that an exhaust valve plate seriously depends on a torsion spring to close an exhaust port.
In order to solve the above problems, the present invention provides the following technical solutions:
the fire check valve includes:
the valve body is provided with an exhaust passage, and the exhaust passage is provided with an exhaust port and a smoke isolating port;
the exhaust valve plate is provided with a sealing ring, is movably arranged on the valve body and is used for opening or closing the exhaust port;
the smoke isolating valve plate is movably arranged on the valve body and is used for opening or closing the smoke isolating port;
the smoke isolating valve plate is provided with a locking position and an unlocking position, when the locking structure works, the smoke isolating valve plate is fixed at the locking position, and when the locking structure stops working, the smoke isolating valve plate moves to the unlocking position from the locking position to close the smoke isolating port;
the exhaust port is obliquely arranged, and the exhaust valve plate is located above the exhaust port.
When the exhaust port is arranged in an inclined mode and the exhaust valve plate is located above the exhaust port, the exhaust valve plate can close the exhaust port under the action of self weight (when the structure is applied to the existing fireproof check valve with the torsion spring, the exhaust valve plate can close the exhaust port after the torsion spring fails). So design, increase the smoke insulation effect of fire prevention check valve.
In the invention, the exhaust valve plate is positioned above the exhaust port, which means that outdoor smoke can only push the exhaust valve plate to close the exhaust port under the condition of outdoor fire. By the design, the valve can effectively prevent outdoor smoke from spreading indoors. In addition, the exhaust valve plate is arranged outside the valve body, and the valve body does not need to reserve the space required by the movement of the exhaust valve plate, namely, the exhaust valve plate is arranged outside the valve body, so that the volume of the valve body can be effectively reduced. In addition, the exhaust valve plate is arranged outside the valve body, and the ascending air flow in the exhaust passage can push the valve plate to move towards the exhaust port to a certain extent.
When the exhaust port is obliquely arranged and the exhaust valve plate is positioned above the exhaust port, smoke flowing from bottom to top in the smoke channel (the smoke channel is arranged in a residential building, and residents on different floors are communicated with the smoke channel through the fireproof check valve) cannot be blown to the exhaust valve plate.
Furthermore, the exhaust passage is also provided with an air inlet, and the exhaust port inclines downwards from one side close to the air inlet to one side far away from the air inlet. By the design, the size of the valve is reduced, and the manufacturing difficulty of the valve is reduced.
Furthermore, the exhaust valve plate is movably arranged on the outer wall of the exhaust port far away from the valve body. The smoke in the exhaust passage is guided by the exhaust valve plate and then is merged with the smoke in the exhaust passage, and the structure prevents the smoke exhausted indoors from being merged with the smoke in the exhaust passage at the exhaust port. When the smoke exhausted from the room is merged with the smoke in the exhaust passage at the exhaust port, the smoke at the merged part forms turbulent flow, and part of the smoke can flow back into the exhaust passage by the turbulent flow.
Furthermore, the gravity center of the exhaust valve plate is positioned below the center of the exhaust valve plate, and one side of the exhaust valve plate, which is positioned below the center of the exhaust valve plate, is movably arranged on the valve body. When the center of gravity of the exhaust valve plate is located below the center of the exhaust valve plate, one side of the exhaust valve plate located above the center of the exhaust valve plate is easily pushed by smoke with low wind pressure, and one side of the exhaust valve plate located below the center of the exhaust valve plate is difficult to push by low air pressure. So design, the focus of discharge valve piece is located its central below and has following advantage: 1. the wind pressure required by opening the exhaust port at one side above the center of the exhaust valve plate is reduced; 2. increasing the wind pressure required by opening the exhaust port at one side below the center of the exhaust valve plate; 3. the gravity center of the exhaust valve plate is lowered, so that the difficulty of closing the exhaust port by the exhaust valve plate is reduced.
Furthermore, the exhaust valve plate comprises an arc-shaped section, and the arc center of the arc-shaped section is located below the center of the exhaust valve plate. The flue gas mainly promotes the discharge valve piece through the segmental arc and opens the gas vent, and so the design has reduced the action point of flue gas.
Furthermore, the exhaust valve plate protrudes outwards along the exhaust direction. So design, increase the degree of difficulty that the discharge valve piece lies in its center below one side and opens the gas vent.
Furthermore, a counterweight structure is arranged on the exhaust valve plate and is positioned below the center of the exhaust valve plate. So design, counter weight structure is used for reducing the focus of discharge valve piece.
Furthermore, the counterweight structure is a wind shield, and the wind shield extends in the direction away from the exhaust port from the exhaust valve plate. So design, at first, the deep bead can set up on current discharge valve piece, and secondly, the flue gas that flows from up down in the flue blows the deep bead and can increase the effort that discharge valve piece closed the gas vent.
Furthermore, a limiting block is arranged on the valve body, a limiting surface used for preventing the exhaust valve block from moving is arranged on the limiting block, and when the exhaust valve block abuts against the limiting surface, an included angle between the exhaust valve block and the horizontal plane is smaller than or equal to 90 degrees. The structure prevents the center of gravity projection of the exhaust valve plate on the horizontal plane from being positioned outside the exhaust port when the exhaust valve plate opens the exhaust port.
Further, the limiting surface comprises a straight section; or the limiting surface comprises a straight section and an inclined section. The structure is characterized in that the limiting surface is matched with the shape of the exhaust valve plate so as to increase the contact area between the limiting surface and the exhaust valve plate.
Drawings
FIG. 1 is a perspective view of a fire check valve in a preferred embodiment of the present invention;
FIG. 2 is a front view of a fire check valve in a preferred embodiment of the present invention;
FIG. 3 is a cross-sectional view taken along line A-A of FIG. 2 (when the smoke barrier flap closes the smoke barrier);
fig. 4 is a sectional view taken along line a-a in fig. 2 (when the smoke barrier flap opens the smoke barrier).
Detailed Description
The technical solutions of the embodiments of the present invention are explained and illustrated below with reference to the drawings of the embodiments of the present invention, but the following embodiments are only preferred embodiments of the present invention, and not all embodiments. Based on the embodiments in the implementation, other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the present invention.
Example one
Referring to fig. 2 and 3, the fire check valve includes:
the valve body 1 is provided with an exhaust passage 11, and the exhaust passage 11 is provided with an exhaust port 111 and a smoke isolating port 112;
the exhaust valve plate 2 is provided with a sealing ring, and the exhaust valve plate 2 is movably arranged on the valve body 1 and used for opening or closing the exhaust port 111;
the smoke-isolating valve plate 3 is movably arranged on the valve body 1 and is used for opening or closing the smoke-isolating port 112;
the smoke-isolating valve plate 3 is fixed at the locking position when the locking structure 4 works, and the smoke-isolating valve plate 3 moves from the locking position to the unlocking position to close the smoke-isolating port 112 when the locking structure 4 stops working;
wherein, the exhaust port 111 sets up in the slope, and exhaust valve piece 2 is located the exhaust port 111 top.
The locking structure 4 abuts against the smoke-isolating valve plate 3, and when the locking structure 4 abuts against the smoke-isolating valve plate 3, the locking structure 4 works; when the locking structure 4 is separated from the smoke isolating valve plate 3, the locking structure 4 stops working.
It should be noted that: the embodiment does not relate to the improvement to locking structure 4, therefore, this embodiment only lists three kinds of preferred structures of locking structure 4, and the first structure of locking structure 4 includes first sheetmetal, second sheetmetal and the brazing filler metal that is used for connecting first sheetmetal and second sheetmetal, and first sheetmetal sets up on the inner wall of valve body 1, and the second sheetmetal butt is on smoke barrier valve piece 3 when smoke barrier valve piece 3 is in the locking position to prevent smoke barrier valve piece 3 to the motion of smoke barrier 112 direction. When the fireproof check valve is in a high-temperature environment, the brazing filler metal melts and separates the first metal sheet from the second metal sheet (in other words, the locking structure 4 stops working); after the first metal sheet is separated from the second metal sheet, the second metal sheet cannot play a role in blocking the movement of the smoke barrier valve plate 3, and therefore, the smoke barrier valve plate 3 moves towards the smoke barrier 112 under the driving of the self gravity or the driving of external force. The second structure of the locking structure 4 comprises memory metal, one end of the memory metal is arranged on the inner wall of the valve body 1, and the other end of the memory metal is abutted against the smoke-isolating valve plate 3 when the smoke-isolating valve plate 3 is in a locking position so as to prevent the smoke-isolating valve plate 3 from moving towards the smoke-isolating port 112; when the fireproof check valve is in a high-temperature environment, the memory metal moves and is separated from the smoke barrier valve plate 3 (in other words, the locking structure 4 stops working), and after the memory metal moves and is separated from the smoke barrier valve plate 3, the smoke barrier valve plate 3 moves towards the smoke barrier opening 112 under the driving of the self gravity or the driving of external force. The third structure of locking structure 4 includes brazing filler metal and metal sheet, and the metal sheet passes through the brazing filler metal setting on the inner wall of valve body 1, and the metal sheet butt is on separating cigarette valve block 3 when separating cigarette valve block 3 and being in the locking position to prevent to separate cigarette valve block 3 to separating the motion of cigarette mouth 112 direction. When the fireproof check valve is in a high-temperature environment, the brazing filler metal melts and separates from the metal plate (in other words, the locking structure 4 stops working); after the brazing filler metal is separated from the metal plate, the metal plate cannot play a role in blocking the movement of the smoke barrier valve plate 3, and therefore, the smoke barrier valve plate 3 moves towards the smoke barrier opening 112 under the driving of the self gravity or the driving of external force.
In this embodiment, the exhaust passage 11 is further provided with an inlet 113, and as can be seen from fig. 3, the exhaust port 111 is inclined downward from a side close to the inlet 113 to a side far from the inlet 113.
Preferably, the exhaust valve plate 2 is movably disposed on the outer wall of the exhaust port 111 far away from the valve body 1.
Referring to fig. 1, the center of gravity of the exhaust valve plate 2 is located below the center thereof, and one side of the exhaust valve plate 2 located below the center thereof is movably disposed on the valve body 1.
In this embodiment, the exhaust valve plate 2 includes an arc-shaped section, and the arc center of the arc-shaped section is located below the center of the exhaust valve plate 2.
Preferably, the discharge valve plate 2 protrudes outward in the discharge direction.
In this embodiment, a limiting block (not shown in the figure) is disposed on the valve body 1, a limiting surface for preventing the exhaust valve plate 2 from moving clockwise is disposed on the limiting block, and when the exhaust valve plate 2 abuts against the limiting surface, an included angle between the exhaust valve plate 2 and a horizontal plane is not greater than 90 °.
Preferably, the limiting surface comprises a straight section, wherein the straight section is used for abutting against the straight section of the exhaust valve plate 2; or, the spacing face includes straight section and slope section, and wherein, straight section is used for the straight section of butt discharge valve piece 2, and the slope section is used for the slope section of butt discharge valve piece 2.
In this embodiment, the exhaust valve plate 2 can be rotatably connected with the valve body 1, and the smoke isolating valve plate 3 can be rotatably connected with the valve body 1; or the exhaust valve plate 2 is rotatably connected with the upper end of the first connecting rod, the lower end of the first connecting rod is rotatably connected with the valve body 1, the smoke isolating valve plate 3 is rotatably connected with the upper end of the second connecting rod, and the lower end of the second connecting rod is rotatably connected with the valve body 1; or the exhaust valve plate 2 is fixedly connected with the upper end of the first connecting rod, the lower end of the first connecting rod is rotatably connected with the valve body 1, the smoke isolating valve plate 3 is fixedly connected with the upper end of the second connecting rod, and the lower end of the second connecting rod is fixedly connected with the valve body 1.
In this embodiment, when the exhaust valve sheet 2 closes the exhaust port 111, the exhaust valve sheet 2 and/or the sealing ring abuts against the valve body 1. The sealing ring can be made of flexible materials such as rubber, silica gel, refractory cotton and the like, and can be sleeved on the peripheral side of the exhaust valve plate 2, or the sealing ring is pasted on the outer side of the exhaust valve plate 2 (the structure avoids the sealing ring from being clamped between the exhaust valve plate 2 and the valve body 1).
Example two
The difference from the first embodiment is that: in this embodiment, the change mode of the center of gravity of the exhaust valve sheet 2 is changed.
In this embodiment, the exhaust valve plate is provided with a counterweight structure, and the counterweight structure is located below the center of the exhaust valve plate.
Preferably, the counterweight structure is a wind shield, and the wind shield extends from the exhaust valve plate to a direction away from the exhaust port (the direction away from the exhaust port is also the direction close to the center of the flue).
While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims. Any modification which does not depart from the functional and structural principles of the present invention is intended to be included within the scope of the claims.
Claims (10)
1. Fire prevention check valve, its characterized in that includes:
the valve body is provided with an exhaust passage, and the exhaust passage is provided with an exhaust port and a smoke isolating port;
the exhaust valve plate is provided with a sealing ring, is movably arranged on the valve body and is used for opening or closing the exhaust port;
the smoke isolating valve plate is movably arranged on the valve body and is used for opening or closing the smoke isolating port;
the exhaust port is obliquely arranged, and the exhaust valve plate is located above the exhaust port.
2. The fire resistant check valve of claim 1 wherein said exhaust passage further includes an inlet port, and said exhaust port is sloped downwardly from a side adjacent said inlet port to a side remote from said inlet port.
3. The fire protection check valve of claim 2, wherein the vent flap is movably disposed on an outer wall of the vent away from the valve body.
4. The fire prevention check valve of claim 1, wherein a center of gravity of the vent flap is located below a center thereof, and a side of the vent flap located below the center thereof is movably disposed on the valve body.
5. The fire protection check valve of claim 4, wherein the vent flap includes an arcuate segment having an arc center located below a center of the vent flap.
6. The fire protection check valve of claim 5, wherein said vent flap is outwardly convex in the venting direction.
7. The fire resistant check valve of claim 5, wherein the vent flap has a counterweight structure positioned below a center of the vent flap.
8. A fire protection check valve as claimed in claim 7, wherein the weighted structure is a wind deflector extending away from the vent by the vent flap.
9. The fire-resistant check valve of claim 1, wherein the valve body is provided with a limit block, the limit block is provided with a limit surface for preventing the exhaust valve plate from moving, and when the exhaust valve plate abuts against the limit surface, an included angle between the exhaust valve plate and a horizontal plane is less than or equal to 90 °.
10. The fire resistant check valve of claim 9, wherein the check surface comprises a straight section; or the limiting surface comprises a straight section and an inclined section.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910507713 | 2019-06-12 | ||
| CN201910507713X | 2019-06-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112081964A true CN112081964A (en) | 2020-12-15 |
Family
ID=73735841
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010423017.3A Pending CN112081964A (en) | 2019-06-12 | 2020-05-19 | Fireproof check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112081964A (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206053243U (en) * | 2016-08-30 | 2017-03-29 | 广西大业建设集团有限公司 | A kind of fire prevention reverse-filling exhausting duct |
| CN206093073U (en) * | 2016-08-30 | 2017-04-12 | 广西大业建设集团有限公司 | Fire prevention non return exhaust airway |
| WO2018015866A1 (en) * | 2016-07-20 | 2018-01-25 | Atlas Copco Airpower, Naamloze Vennootschap | Check valve assembly |
-
2020
- 2020-05-19 CN CN202010423017.3A patent/CN112081964A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018015866A1 (en) * | 2016-07-20 | 2018-01-25 | Atlas Copco Airpower, Naamloze Vennootschap | Check valve assembly |
| CN206053243U (en) * | 2016-08-30 | 2017-03-29 | 广西大业建设集团有限公司 | A kind of fire prevention reverse-filling exhausting duct |
| CN206093073U (en) * | 2016-08-30 | 2017-04-12 | 广西大业建设集团有限公司 | Fire prevention non return exhaust airway |
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