CN108488445B - Fireproof check valve - Google Patents
Fireproof check valve Download PDFInfo
- Publication number
- CN108488445B CN108488445B CN201810669974.7A CN201810669974A CN108488445B CN 108488445 B CN108488445 B CN 108488445B CN 201810669974 A CN201810669974 A CN 201810669974A CN 108488445 B CN108488445 B CN 108488445B
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- China
- Prior art keywords
- piece
- bracket
- check valve
- plate
- locking
- 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.)
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Links
- 230000002093 peripheral effect Effects 0.000 claims abstract description 15
- 230000007246 mechanism Effects 0.000 claims abstract description 11
- 238000009423 ventilation Methods 0.000 claims description 25
- 230000000149 penetrating effect Effects 0.000 claims description 10
- 238000007789 sealing Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000007480 spreading Effects 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 239000002184 metal Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 239000004566 building material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000009970 fire resistant effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
Classifications
-
- 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
- F16K15/033—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member spring-loaded
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Air-Flow Control Members (AREA)
Abstract
The invention relates to a fireproof check valve, comprising: a valve body; the valve plate is pivotally connected with the valve body and matched with the air outlet; the locking mechanism comprises a plurality of limiting blocks, locking pieces, a support, a shifting piece, an elastic piece and a temperature sensing element, wherein the limiting blocks are arranged on the peripheral surface of the ventilating pipe and extend to exceed the air outlet, the locking pieces are slidably arranged on the surface of the valve plate and matched with the limiting blocks, one end of the support is arranged on the peripheral surface of the ventilating pipe, the shifting piece is pivotally connected with the support and corresponds to the locking pieces, the elastic piece is arranged between the support and the shifting piece, and the temperature sensing element is connected with the support and the shifting piece. Therefore, the limiting and fixing of the valve plate can be realized, the tightness between the valve plate and the valve body is ensured, and the fire of the flue is prevented from spreading indoors.
Description
Technical Field
The invention belongs to the field of building materials, and particularly relates to a fireproof check valve.
Background
The fireproof check valve is an integral metal member, is preferably made of metal, and has the functions of preventing fire, preventing smoke from flowing backward and preventing air from flowing out in the wind. The fireproof check valve is generally used for installing an air inlet of a flue in a kitchen and is connected with a smoke exhaust ventilator so as to intensively exhaust dirty air such as indoor oil smoke and the like out of a roof and prevent the smoke in the flue from flowing backwards; and when fire occurs in the building, the fire is delayed from the flue to the indoor tendril, and the check valve needs to be automatically closed to prevent the fire from spreading in time. The existing fireproof check valve is lack of locking structure, so that when fire occurs in a building, the fireproof check valve is difficult to realize effective sealing, and fire spreading is difficult to prevent.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a fireproof check valve.
In order to achieve the above purpose, the invention adopts the following technical scheme: a fire protection check valve, comprising:
the valve body comprises a ventilation pipe and a supporting plate formed on the peripheral surface of the ventilation pipe, and the ventilation pipe is provided with an air inlet and an air outlet;
the valve plate is pivotally connected with the valve body and matched with the air outlet;
it also includes:
the locking mechanism comprises a plurality of limiting blocks, a locking piece, a bracket, a pulling piece, an elastic piece and a temperature sensing element, wherein the limiting blocks are arranged on the peripheral surface of the ventilation pipe and extend to exceed the air outlet, the locking piece is slidably arranged on the surface of the valve plate and matched with the limiting blocks, one end of the bracket is arranged on the peripheral surface of the ventilation pipe, the pulling piece is pivoted with the bracket and corresponds to the locking piece, the elastic piece is arranged between the bracket and the pulling piece, and the temperature sensing element is connected with the bracket and the pulling piece;
the locking mechanism is in an unlocking state and a locking state, when the locking mechanism is in the unlocking state, the elastic piece is compressed, and the locking piece is separated from the limiting block; when the temperature sensing element is in a locking state, the temperature sensing element is heated and damaged, the elastic piece drives the poking piece to rotate relative to the bracket so that the locking piece slides synchronously, and the locking piece is clamped with the limiting block.
Optimally, a plurality of waist-shaped holes are formed in the locking piece, and the locking piece is slidably arranged on the valve plate through a plurality of groups of bolt pairs matched with the waist-shaped holes.
Optimally, a connecting plate is arranged on the surface of the valve plate, the connecting plate is in pivot connection with the bracket through a first pivot penetrating through the connecting plate, and a torsion spring propping against the connecting plate and the bracket is sleeved on the first pivot.
Further, a limit stop block perpendicular to the connecting plate is formed at the end of the connecting plate, and a projection penetrating through the limit stop block is formed at one end, matched with the poking piece, of the locking piece.
Further, a guide inclined block corresponding to the convex block and matched with the poking piece is formed on the surface of the connecting plate.
Further, the bracket comprises a first connecting part and a second connecting part, wherein the first connecting part is installed on the peripheral surface of the ventilation pipe, the second connecting part is integrally connected with the free end of the first connecting part and forms an obtuse angle with the free end of the first connecting part, and the connecting plate is positioned between the first connecting part and the second connecting part.
Optimally, the limiting block is provided with a locking notch matched with the locking piece.
Optimally, the other end of the bracket is in pivot connection with the poking piece through a second pivot penetrating through the bracket, and the elastic piece is sleeved on the second pivot.
Optimally, the air guide device further comprises an air guide cover which is arranged on the surface of the supporting plate and corresponds to the air outlet, and at least one group of fixing torsion lugs which are arranged on the side face of the air guide cover.
Optimally, a groove is formed on the end face of the vent pipe where the air outlet is located, and a sealing part matched with the groove is formed at the edge of the valve plate.
Due to the application of the technical scheme, compared with the prior art, the invention has the following advantages: according to the fireproof check valve, the valve body and the valve plate are provided with the locking mechanism with a specific structure, so that the valve plate can be limited and fixed, the tightness between the valve plate and the valve body is ensured, and the fire of a flue is prevented from spreading indoors.
Drawings
FIG. 1 is a schematic view of the structure of the fire-resistant check valve of the present invention;
FIG. 2 is an enlarged view of a portion of the fire check valve of the present invention;
FIG. 3 is a state diagram of the fire protection check valve of the present invention with the valve plate open;
fig. 4 is an enlarged view of the fixing knob of the fire-proof check valve of the present invention.
Detailed Description
The preferred embodiments of the present invention will be described in detail below with reference to the attached drawings:
the fireproof check valve shown in fig. 1 to 3 mainly comprises a valve body 1, a valve plate 3, a locking mechanism 4 and the like.
Wherein, the valve body 1 is conventional, and generally comprises a ventilation pipe 12 and a support plate 11 formed on the peripheral surface of the ventilation pipe 12 (the support plate 11 is generally integrally formed on the peripheral surface of the ventilation pipe 12 so that the support plate 11 is perpendicular to the ventilation pipe 12); the ventilation pipe 12 may be a regular shape such as a square pipe or a round pipe, may be a uniform straight pipe, or may be a special pipe (preferably a uniform round pipe) having a different inner diameter; when the draft tube 12 is a round tube, its inside diameter; considering the difficulty of the manufacturing process, a through hole can be formed in the center of the supporting plate 11, and the two side surfaces of the supporting plate 11 are welded with the flow pipes (the flow pipes correspond to the through holes) respectively, so that the flow pipes on the two sides are communicated, and at the moment, the two flow pipes are the ventilation pipe 12 as a whole. The ventilation pipe 12 has an air inlet 121 and an air outlet 122. The valve plate 3 is pivotally connected to the valve body 1, and is matched with the air outlet 122 so as to rotate to a position corresponding to the air outlet 122, and the valve plate can be flat or arc-shaped.
The locking mechanism 4 includes a stopper 41, a locking piece 42, a bracket 44, a pulling piece 45, an elastic member 46, a temperature sensing element 47, and the like. The limiting blocks 41 are arranged at intervals, are arranged at the upper part of the peripheral surface of the ventilation pipe 12 (near the air outlet 122, and the relative direction is defined according to the direction shown in fig. 1) and extend to exceed the air outlet 122; the locking piece 42 is slidably mounted on the surface of the valve plate 3 (the outer surface, i.e., the surface facing away from the support plate 11) to cooperate with the stopper 41; in this embodiment, two limiting blocks 41 are symmetrical about the axis of the ventilation pipe 12, and locking openings 411 matched with the locking pieces 42 are formed in the limiting blocks; the locking tab 42 is now Y-shaped. One end of the bracket 44 is installed at the lower portion of the peripheral surface of the ventilation pipe 12; the pulling piece 45 is pivotally connected with the bracket 44 and corresponds to the locking piece 42, so that when the pulling piece 45 rotates relative to the bracket 44, the outer end (i.e. the free end) of the pulling piece 45 can contact with the pulling piece 45 to drive the pulling piece to move relative to the valve plate 3; the elastic member 46 is provided between the bracket 44 and the dial 45, and the temperature sensing element 47 is used to connect and clamp the bracket 44 and the dial 45 such that the elastic member 46 is compressed between the bracket 44 and the dial 45. The locking mechanism 4 thus has both an unlocked state and a locked state, and when it is in the unlocked state, the elastic member 46 is compressed, and the locking piece 42 is disengaged from the stopper 41; when the temperature sensing element 47 is in a locking state, the temperature sensing element 47 is damaged by heating and cannot clamp the bracket 44 and the poking plate 45, the elastic piece 46 is restored under the action of elastic force and drives the poking plate 45 to rotate relative to the bracket 44 so that the locking piece 42 synchronously slides upwards, and the locking piece 42 is clamped with the limiting block 41.
In this embodiment, a plurality of waist-shaped holes 421 are formed in the locking piece 42 (the waist-shaped holes 421 extend up and down), and a set of bolt pairs 43 penetrating through the valve plate 3 are installed in each waist-shaped hole 421, so that the locking piece 42 and the valve plate 3 are connected, at this time, the bolt pairs 43 do not lock the locking piece 42 on the valve plate 3, and thus the locking piece 42 can slide relatively on the surface of the valve plate 3 under the action of external force. The surface of the valve plate 3 (the surface on which the locking piece 42 is mounted) is provided with a connecting plate 31, the connecting plate 31 is pivotally connected with the bracket 44 through a first pivot 33 penetrating through the connecting plate 31 (i.e. the pivotal connection between the valve plate 3 and the bracket 44 is realized), and the first pivot 33 is sleeved with a torsion spring 34 which abuts against the connecting plate 31 and the bracket 44, and the torsion spring 34 is used for resetting the valve plate 3. The end (i.e., upper end) of the connection plate 31 is formed with a limit stop 32 perpendicular thereto, and one end of the locking piece 42, which is engaged with the pulling piece 45, is formed with a projection 422 penetrating the limit stop 32; the surface (i.e., the outer surface) of the connection plate 31 is formed with a guide inclined block 35 corresponding to the projection 422 and cooperating with the dial 45; for improving the reliability of the engagement between the locking piece 42 and the dial 45, respectively (the free end of the dial 45 is formed with a protruding tip 451 for engaging with the projection 422 to reduce friction and further improve the reliability of the dial). The bracket 44 includes a first connecting portion 441 mounted on a lower portion of the peripheral surface of the ventilation tube 12, and a second connecting portion 442 integrally connected to a free end of the first connecting portion 441 and forming an obtuse angle therewith, and the first pivot 33 is disposed at a connection portion between the first connecting portion 441 and the second connecting portion 442 in a penetrating manner, such that the connecting plate 31 is located between the first connecting portion 441 and the second connecting portion 442. The other end of the bracket 44 (i.e., the free end of the second connecting portion 442) is pivotally connected to the dial 45 via a second pivot shaft 48 passing therethrough, and an elastic member 46 (typically a torsion spring) is sleeved on the second pivot shaft 48, thereby achieving a pivotal connection between the dial 45 and the bracket 44. One end of the temperature sensing element 47 is fixed on the second connecting portion 442, and the other end penetrates the pulling piece 45 and abuts against the outer surface thereof, so that the pulling piece 45 and the bracket 44 approach each other to compress the elastic member 46.
In this embodiment, the fireproof check valve further includes a wind scooper 2 mounted on the surface of the supporting plate 11 and corresponding to the air outlet 122, and at least one set of fixing torsion lugs 5 (similar to a torsion spring structure as shown in fig. 4) mounted on the side surface of the wind scooper 2. In the present embodiment, the wind scooper 2 includes two side plates 21 fixed on the surface of the supporting plate 11 (the two side plates 21 are located at both sides of the air outlet 122) and an end plate 22 connecting the outer ends of the two side plates 21, and the side plates 21 and the end plate 22 are connected by a plurality of rivets 23; when in use, the cross-sectional area of the lower end of the wind scooper 2 is smaller than the cross-sectional area of the upper end thereof; when there is a wind scooper 2, the bracket 44 may be selectively mounted on the end plate 22, but the rigidity is insufficient due to the thinner material of the wind scooper 2, which affects the reliability of the operation of the pulling piece 45. In this embodiment, the end surface of the air outlet 122 of the air pipe 12 is formed with a groove 23, and the edge of the valve plate 3 is formed with a sealing part 301 matched with the groove 23 to improve the sealing performance between the air pipe 12 and the valve plate 3; a seal ring may be added to the edge of the sealing portion 301 to further improve the sealing property.
Installing the fireproof check valve so that the supporting plate 11 is installed on the wall body and the wind scooper 2 extends into the flue; the working principle of the fireproof check valve is as follows: the valve plate 3 is covered at the air outlet 122 of the ventilation pipe 12 under the action of the torsion spring 34 and the automatic gravity (the air outlet 122 is not vertical but slightly inclined, so that the distance between the upper end of the air outlet 122 and the supporting plate 11 is smaller than the distance between the lower end of the air outlet and the supporting plate 11); when the oil smoke enters the valve body 1 from the air inlet 121, the valve plate 3 is stressed (acting force of the oil smoke) to open the air outlet 122 and drive the connecting plate 31 to rotate around the first pivot 33, and at the moment, the connecting plate 31 extrudes the torsion spring 34 to deform; when no oil smoke enters the valve body 1 from the air inlet 121, the torsion spring 34 releases elastic potential energy to enable the connecting plate 31 to rotate around the first pivot 33, so that the air outlet 122 is closed by the valve plate 3; the repeated switching of the valve sheet 3 can be realized because the temperature sensing element 47 works normally: at this time, one end of the temperature sensing element 47 is fixed to the bracket 44 and the other end extends to be fastened to the outer surface of the pulling piece 45, so that the elastic member 46 is compressed therebetween, and the pulling piece 45, the locking piece 42 and the stopper 41 are separated from each other. However, when a fire condition is generated in the flue and spreads to the fireproof check valve, the temperature sensing element 47 is damaged or fused by heating, so that the clamping connection of the bracket 44 and the poking plate 45 cannot be effectively realized, the elastic piece 46 releases elastic potential energy, the poking plate 45 rotates around the second pivot 48, the poking plate 45 synchronously drives the locking plate 42 to slide upwards, and two upper ends of the Y-shaped locking plate 42 are inserted into the locking notch 411 of the limiting block 41, so that the valve plate 3 is firmly limited in a box cover state.
The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the present invention and to implement the same, but are not intended to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be included in the scope of the present invention.
Claims (10)
1. A fire protection check valve, comprising:
the valve body (1), the valve body (1) comprises a ventilation pipe (12) and a supporting plate (11) formed on the peripheral surface of the ventilation pipe (12), and the ventilation pipe (12) is provided with an air inlet (121) and an air outlet (122);
the valve plate (3) is pivotally connected with the valve body (1) and matched with the air outlet (122);
characterized in that it further comprises:
the locking mechanism (4) comprises a plurality of limiting blocks (41) which are arranged on the peripheral surface of the ventilation pipe (12) and extend to exceed the air outlet (122), a locking piece (42) which is slidably arranged on the surface of the valve plate (3) and matched with the limiting blocks (41), a bracket (44) with one end arranged on the peripheral surface of the ventilation pipe (12), a pulling piece (45) which is pivoted with the bracket (44) and corresponds to the locking piece (42), an elastic piece (46) arranged between the bracket (44) and the pulling piece (45) and a temperature sensing element (47) which is connected with the bracket (44) and the pulling piece (45);
the locking mechanism (4) has an unlocking state and a locking state, when the locking mechanism is in the unlocking state, the elastic piece (46) is compressed, and the locking piece (42) is separated from the limiting block (41); when the temperature sensing element (47) is in a locking state, the temperature sensing element is damaged by heating, the elastic piece (46) drives the poking piece (45) to rotate relative to the bracket (44) so that the locking piece (42) slides synchronously, and the locking piece (42) is clamped with the limiting block (41).
2. The fire protection check valve of claim 1, wherein: the locking piece (42) is provided with a plurality of waist-shaped holes (421), and the locking piece (42) is slidably arranged on the valve plate (3) through a plurality of groups of bolt pairs (43) matched with the waist-shaped holes (421).
3. The fire protection check valve of claim 1, wherein: the surface of the valve plate (3) is provided with a connecting plate (31), the connecting plate (31) is in pivot connection with the bracket (44) through a first pivot (33) penetrating through the connecting plate, and a torsion spring (34) propping against the connecting plate (31) and the bracket (44) is sleeved on the first pivot (33).
4. A fire protection check valve according to claim 3, wherein: the end of the connecting plate (31) is provided with a limit stop (32) perpendicular to the connecting plate, and one end of the locking piece (42) matched with the poking piece (45) is provided with a lug (422) penetrating through the limit stop (32).
5. The fire protection check valve of claim 4, wherein: the surface of the connecting plate (31) is provided with a guide inclined block (35) corresponding to the convex block (422) and matched with the poking piece (45).
6. A fire protection check valve according to claim 3, wherein: the bracket (44) comprises a first connecting part (441) arranged on the peripheral surface of the ventilation pipe (12) and a second connecting part (442) integrally connected with the free end of the first connecting part (441) and forming an obtuse angle with the free end of the first connecting part, and the connecting plate (31) is positioned between the first connecting part (441) and the second connecting part (442).
7. The fire protection check valve of claim 1, wherein: the limiting block (41) is provided with a locking notch (411) matched with the locking piece (42).
8. The fire protection check valve of claim 1, wherein: the other end of the bracket (44) is in pivot connection with the poking piece (45) through a second pivot (48) penetrating through the bracket, and the elastic piece (46) is sleeved on the second pivot (48).
9. The fire protection check valve of claim 1, wherein: the air guide device further comprises an air guide cover (2) which is arranged on the surface of the supporting plate (11) and corresponds to the air outlet (122), and at least one group of fixing torsion lugs (5) which are arranged on the side face of the air guide cover (2).
10. The fire protection check valve of claim 1, wherein: the end face of the air outlet (122) in the ventilation pipe (12) is provided with a groove (23), and the edge of the valve plate (3) is provided with a sealing part (301) matched with the groove (23).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810669974.7A CN108488445B (en) | 2018-06-26 | 2018-06-26 | Fireproof check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810669974.7A CN108488445B (en) | 2018-06-26 | 2018-06-26 | Fireproof check valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108488445A CN108488445A (en) | 2018-09-04 |
| CN108488445B true CN108488445B (en) | 2023-12-22 |
Family
ID=63343145
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810669974.7A Active CN108488445B (en) | 2018-06-26 | 2018-06-26 | Fireproof check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108488445B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357053B (en) * | 2018-12-05 | 2024-02-06 | 西安友谊燃气设备有限公司 | Super-flow automatic closing member and double-flow double-control self-closing valve |
| CN113048272B (en) * | 2021-03-27 | 2022-11-25 | 浙江尚扬通风设备有限公司 | Smoke-discharging fire-proof valve |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09113023A (en) * | 1995-10-19 | 1997-05-02 | Mitsubishi Electric Corp | Hood with fire damper and fire damper apparatus |
| DE19857280C1 (en) * | 1998-12-11 | 2000-08-31 | Max Romacker | Vent line shutoff for building fires controls valve movement by holder as soldered link which melts with heat to actuate pre-tensioned spring and close fireproofly rimmed valve. |
| CN102135198A (en) * | 2011-03-29 | 2011-07-27 | 李武鸿 | Guide fireproofing check valve |
| WO2014021124A1 (en) * | 2012-07-29 | 2014-02-06 | タカハタプレシジョンジャパン株式会社 | Check valve |
| CN105240582A (en) * | 2015-10-16 | 2016-01-13 | 宁波方太厨具有限公司 | Flue fire damper for range hood |
| CN106678400A (en) * | 2017-03-13 | 2017-05-17 | 杭州小米环境科技有限公司 | Fireproof check valve |
| CN107489794A (en) * | 2017-09-26 | 2017-12-19 | 姚世杰 | A kind of oil-smoke-exhausting fireproof check valve |
| CN207230690U (en) * | 2017-10-12 | 2018-04-13 | 杭州老板电器股份有限公司 | Fire-preventing check valve and central cooking fume control equipment |
| CN208331346U (en) * | 2018-06-26 | 2019-01-04 | 盐城市百世达建材有限公司 | A kind of fire-preventing check valve |
-
2018
- 2018-06-26 CN CN201810669974.7A patent/CN108488445B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09113023A (en) * | 1995-10-19 | 1997-05-02 | Mitsubishi Electric Corp | Hood with fire damper and fire damper apparatus |
| DE19857280C1 (en) * | 1998-12-11 | 2000-08-31 | Max Romacker | Vent line shutoff for building fires controls valve movement by holder as soldered link which melts with heat to actuate pre-tensioned spring and close fireproofly rimmed valve. |
| CN102135198A (en) * | 2011-03-29 | 2011-07-27 | 李武鸿 | Guide fireproofing check valve |
| WO2014021124A1 (en) * | 2012-07-29 | 2014-02-06 | タカハタプレシジョンジャパン株式会社 | Check valve |
| CN105240582A (en) * | 2015-10-16 | 2016-01-13 | 宁波方太厨具有限公司 | Flue fire damper for range hood |
| CN106678400A (en) * | 2017-03-13 | 2017-05-17 | 杭州小米环境科技有限公司 | Fireproof check valve |
| CN107489794A (en) * | 2017-09-26 | 2017-12-19 | 姚世杰 | A kind of oil-smoke-exhausting fireproof check valve |
| CN207230690U (en) * | 2017-10-12 | 2018-04-13 | 杭州老板电器股份有限公司 | Fire-preventing check valve and central cooking fume control equipment |
| CN208331346U (en) * | 2018-06-26 | 2019-01-04 | 盐城市百世达建材有限公司 | A kind of fire-preventing check valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108488445A (en) | 2018-09-04 |
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Address after: 224012 Group 1, Jiuqu Neighborhood Committee, Anhu Street, Yandu District, Yancheng City, Jiangsu Province (S) Patentee after: YANCHENG BAISHIDA BUILDING MATERIAL Co.,Ltd. Country or region after: China Address before: 224000, Group 1, Jiuqu Neighborhood Committee, Anhu Street, Yandu District, Yangzhou City, Jiangsu Province (S) Patentee before: YANCHENG BAISHIDA BUILDING MATERIAL Co.,Ltd. Country or region before: China |
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