CN108488445A - A kind of fire-preventing check valve - Google Patents
A kind of fire-preventing check valve Download PDFInfo
- Publication number
- CN108488445A CN108488445A CN201810669974.7A CN201810669974A CN108488445A CN 108488445 A CN108488445 A CN 108488445A CN 201810669974 A CN201810669974 A CN 201810669974A CN 108488445 A CN108488445 A CN 108488445A
- Authority
- CN
- China
- Prior art keywords
- fire
- holder
- plectrum
- check valve
- block
- 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.)
- Granted
Links
- 238000009423 ventilation Methods 0.000 claims abstract description 30
- 230000007246 mechanism Effects 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims description 5
- 230000003685 thermal hair damage Effects 0.000 claims description 4
- 230000006835 compression Effects 0.000 claims description 2
- 238000007906 compression Methods 0.000 claims description 2
- 239000007787 solid Substances 0.000 claims 1
- 239000000779 smoke Substances 0.000 description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003546 flue gas Substances 0.000 description 2
- 238000005381 potential energy Methods 0.000 description 2
- 230000002265 prevention Effects 0.000 description 2
- 230000007480 spreading Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 235000019504 cigarettes Nutrition 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 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
- 239000002184 metal Substances 0.000 description 1
- 239000007769 metal 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)
- Air-Flow Control Members (AREA)
- Check Valves (AREA)
Abstract
The present invention relates to a kind of fire-preventing check valves, it includes：Valve body；Valve block, the valve block connect with the valve body phase pivot and are matched with the air outlet；Locking mechanism, the locking mechanism include be mounted on the ventilation duct circumferential surface and extend to multiple limited blocks beyond the air outlet, be slidably mounted in the valve block surface and with the matched locking plate of the limited block, one end be mounted on the ventilation duct circumferential surface holder, with holder phase pivot connection and plectrum corresponding with the locking plate, the elastic component being arranged between the holder and the plectrum and the temperature-sensing element for connecting the holder and the plectrum.The leakproofness that the limit to valve block is fixed and ensures it with valve body can be realized in this way, avoid flue fire behavior to indoor sprawling.
Description
Technical field
The invention belongs to building material fields, and in particular to a kind of fire-preventing check valve.
Background technology
Fire-preventing check valve be monoblock type metal component, preferably use metal material, be provided simultaneously with fire prevention, prevent flue gas pour in down a chimney and
The upward wind-guiding function of outlet air.Fire-preventing check valve is commonly used in the air inlet mounted on kitchen inner flue, is connect with smoke exhaust ventilator,
The foul atmospheres such as indoor oil smoke are concentrated discharge roofing, prevent the flue gas in flue from pouring in down a chimney；And when generation fire in building, fire
To when indoor sprawling, check (non-return) valve needs are automatically closed to prevent fire behavior from spreading in time the hows and whys flue.Existing fire-preventing check valve by
In lacking locking structure, in this way when fire occurs in building, fire-preventing check valve, which is difficult to realize effectively seal, to be caused to be difficult to prevent fire
Feelings are spread.
Invention content
A kind of fire-preventing check valve is provided the invention aims to overcome the deficiencies in the prior art.
In order to achieve the above objectives, the technical solution adopted by the present invention is：A kind of fire-preventing check valve, it includes：
Valve body, the valve body include ventilation duct and the support plate for being formed in the ventilation duct circumferential surface, the ventilation duct have into
Air port and air outlet；
Valve block, the valve block connect with the valve body phase pivot and are matched with the air outlet；
It further includes：
Locking mechanism, the locking mechanism include being mounted on the ventilation duct circumferential surface and extending to beyond the more of the air outlet
A limited block is slidably mounted in the valve block surface and is mounted on institute with the matched locking plate of the limited block, one end
The holder of ventilation duct circumferential surface is stated, is connected with the holder phase pivot and plectrum corresponding with the locking plate, setting are described
The temperature-sensing element of elastic component and the connection holder and the plectrum between holder and the plectrum；
The locking mechanism, which has, unlocks and locks two states, and when its is in the unlocked state, the elastic component is compressed, institute
Locking plate is stated to be separated with the limited block；When it is in the lock state, the temperature-sensing element is by thermal damage, the elastic component
Drive the relatively described holder pivots of the plectrum that the locking plate synchronous slide, the locking plate is made mutually to block with the limited block
It connects.
Optimally, multiple waist-shaped holes are offered on the locking plate, the locking plate with the waist-shaped hole by matching
Multigroup bolt pair be slidably mounted on the valve block.
Optimally, connecting plate is installed, the connecting plate is by being arranged in the first pivot therein on the surface of the valve block
Axis is connect with the holder phase pivot, and the torsional spring for resisting the connecting plate and the holder is arranged on first pivot.
Further, the end of the connecting plate is formed with the limited block perpendicular with it, in the locking plate with institute
It states the matched one end of plectrum and forms the convex block for running through the limited block.
Further, the surface of the connecting plate be formed with it is corresponding with the convex block and with the plectrum is matched leads
To skewback.
Further, the holder includes connecting mounted on the first connecting portion of the ventilation duct circumferential surface and with described first
The second connecting portion of socket part free end integrally connected and formed obtuse angle, the connecting plate are located at the first connecting portion and institute
It states between second connecting portion.
Optimally, it is offered on the limited block and the matched locking gap of the locking plate.
Optimally, the other end of the holder is connect by being arranged in the second pivot therein with the plectrum phase pivot,
The elastic component is sheathed on second pivot.
Optimally, it further includes mounted on the support plate surface and wind scooper corresponding with the air outlet and peace
The fixed torsion ear of at least one set mounted in the wind scooper side.
Optimally, the end face residing for air outlet described in the ventilation duct is formed fluted, the edge shape of the valve block
The sealing of fit depressions described in Cheng Youyu.
Since above-mentioned technical proposal is used, the present invention has following advantages compared with prior art：Present invention fire prevention non-return
Valve can realize the limit fixation to valve block and protect in this way by installing the locking mechanism of specific structure on valve body and valve block
Its leakproofness with valve body is demonstrate,proved, avoids flue fire behavior to indoor sprawling.
Description of the drawings
Fig. 1 is the structural schematic diagram of fire-preventing check valve of the present invention；
Fig. 2 is the partial enlarged view of fire-preventing check valve of the present invention；
Fig. 3 is state diagram of the fire-preventing check valve of the present invention when valve block is opened；
Fig. 4 is that fire-preventing check valve of the present invention fixes the enlarged drawing for turning round ear.
Specific implementation mode
The preferred embodiment of the invention is described in detail below in conjunction with attached drawing：
Fire-preventing check valve as shown in Figure 1 to Figure 3 includes mainly valve body 1, valve block 3 and locking mechanism 4 etc..
Wherein, valve body 1 uses existing conventional, generally includes ventilation duct 12 and is formed in 12 circumferential surface of ventilation duct
Support plate 11（Support plate 11 is typically to be integrally formed on the circumferential surface of ventilation duct 12 so that support plate 11 is perpendicular to ventilation duct
12）；Ventilation duct 12 can be the shape of the routine such as square tube, pipe, can be uniform straight tube, or the abnormal shape that internal diameter differs
Pipe（Preferably uniform pipe）；When ventilation duct 12 is pipe, its internal diameter；In view of the difficulty or ease of manufacture craft, can prop up
11 center of fagging opens up through-hole, and runner pipe is respectively welded in the two sides of support plate 11（Runner pipe is corresponding with through-hole）, make
The runner pipe for obtaining both sides is connected, and two runner pipes are ventilation duct 12 on the whole at this time.Ventilation duct 12 has air inlet 121
With air outlet 122.Valve block 3 is connect with 1 phase pivot of valve body, it is matched with air outlet 122, so as to turn to corresponding closing lid
At air outlet 122, it can be flat and arc.
Locking mechanism 4 includes then limited block 41, locking plate 42, holder 44, plectrum 45, elastic component 46 and temperature-sensing element 47
Deng.Limited block 41 has multiple（Interval setting）, they are mounted on the top of 12 circumferential surface of ventilation duct（It is related at air outlet 122
Direction is defined according to direction shown in Fig. 1）And it extends to beyond air outlet 122；Locking plate 42 is slidably mounted
On the surface of valve block 3（Outer surface deviates from the surface of support plate 11）And it is matched with limited block 41；In the present embodiment,
Limited block 41 is two, they are symmetrical about the axial line of ventilation duct 12, offer thereon and 42 matched locking of locking plate
Gap 411；Locking plate 42 is in Y types at this time.One end of holder 44 is mounted on the lower part of 12 circumferential surface of ventilation duct；Plectrum 45 and holder 44
Phase pivot connects, it is corresponding with locking plate 42, in this way when 45 opposite brackets 44 of plectrum are rotated, its outer end（I.e. certainly
By holding）It can be in contact with plectrum 45 and then its opposite valve block 3 is driven to move；The setting of elastic component 46 holder 44 and plectrum 45 it
Between, temperature-sensing element 47 is for connecting and blocking holder 44 and plectrum 45 so that elastic component 46 is compressed in holder 44 and plectrum 45
Between.Locking mechanism 4, which has, in this way unlocks and locks two states, and when its is in the unlocked state, elastic component 46 is compressed, lock
Stator 42 is separated with limited block 41；When it is in the lock state, temperature-sensing element 47 can not be blocked 44 He of holder by thermal damage
Plectrum 45, elastic component 46 restore to the original state under the action of elastic force and the rotation of 45 opposite brackets 44 of plectrum are driven to keep locking plate 42 same
Walk upward sliding so that locking plate 42 is clamped with 41 phase of limited block.
In the present embodiment, multiple waist-shaped holes 421 are offered on locking plate 42（The direction of waist-shaped hole 421 is upper downward
It stretches）, one group of bolt pair 43 through valve block 3 is installed, to realize the company of locking plate 42 and valve block 3 in each waist-shaped hole 421
It connects, bolt pair 43 does not lock locking plate 42 in valve block 3 at this time, can realize locking plate 42 in valve under the effect of external force in this way
3 surface of piece is opposite to be slided.The surface of valve block 3（The surface of locking plate 42 is installed）On connecting plate 31 is installed, connecting plate 31 passes through
The first pivot 33 therein is arranged in connect with 44 phase pivot of holder（Realize the pivot connection of valve block 3 and holder 44）, the
The torsional spring 34 for resisting connecting plate 31 and holder 44 is arranged on one pivot 33, this torsional spring 34 is used for the reset of valve block 3.Connecting plate 31
End（That is upper end）It is formed with the limited block 32 perpendicular with it, is formed with 45 matched one end of plectrum in locking plate 42
Through the convex block 422 of limited block 32；The surface of connecting plate 31（That is outer surface）It is formed with and and plectrum corresponding with convex block 422
45 matched guiding skewbacks 35；It is respectively used to improve the reliability coordinated between locking plate 42 and plectrum 45（Plectrum 45 from
Spur 451 is formed with by end, for coordinating with convex block 422, to reduce friction and further increase the reliability stirred）.And it props up
Frame 44 includes being mounted on the first connecting portion 441 of 12 circumferential surface lower part of ventilation duct and integrally connecting with 441 free end of first connecting portion
It connects and the second connecting portion at formed obtuse angle 442, the first pivot 33 is threaded through first connecting portion 441 and second connecting portion 442
Junction so that connecting plate 31 is between first connecting portion 441 and second connecting portion 442.The other end of holder 44（I.e.
The free end of two interconnecting pieces 442）It is connect with 45 phase pivot of plectrum by being arranged in the second pivot 48 therein, elastic component 46（It is logical
It is often torsional spring）It is set on the second pivot 48, to realize the pivot connection between plectrum 45 and holder 44.Temperature-sensing element 47
One end is fixed in second connecting portion 442 and the other end then runs through plectrum 45 and on its outer surface so that plectrum 45 and branch
It is close to each other and elastic component 46 is compressed between frame 44.
In the present embodiment, fire-preventing check valve further includes mounted on 11 surface of support plate and corresponding with air outlet 122
Wind scooper 2 and at least one set mounted on 2 side of wind scooper is fixed turns round ear 5（As shown in figure 4, similar to the structure of torsional spring）.
In the present embodiment, wind scooper 2 includes two blocks of side plates 21 being fixed on 11 surface of support plate（Two blocks of side plates 21 are located at air outlet
122 both sides）And the end plate 22 of two pieces of 21 outer ends of side plate of connection, connected by multiple rivets 23 between side plate 21 and end plate 22
It connects；When in use, the lower end area of section of wind scooper 2 is less than the upper end area of section；When there are when wind scooper 2, can selecting
Holder 44 is mounted on end plate 22, but since the material of wind scooper 2 is relatively thin and rigidity is inadequate, influences the reliable of the work of plectrum 45
Property.In the present embodiment, the end face in ventilation duct 12 residing for air outlet 122 forms fluted 23, and the edge of valve block 3 is formed with
With 23 matched sealing 301 of groove, to improve the leakproofness between ventilation duct 12 and valve block 3；It can be in sealing 301
Edge adds sealing ring and further increases leakproofness.
Above-mentioned fire-preventing check valve is installed so that support plate 11 is on wall and wind scooper 2 extends to flue
In；The operation principle of above-mentioned fire-preventing check valve is specific as follows：Box cover under the action of torsional spring 34 and automatic gravity of valve block 3 is being divulged information
At the air outlet 122 of pipe 12（Air outlet 122 is not and is vertical and is slightly slanted so that 122 upper end of air outlet and support plate 11
The spacing for being smaller than its lower end and support plate 11）；After oil smoke enters valve body 1 from air inlet 121,3 stress of valve block（Oil
The active force of cigarette）It opens air outlet 122 and connecting plate 31 is driven to be rotated around the first pivot 33, turned round at this point, connecting plate 31 squeezes
Spring 34 makes it generate deformation；When no oil smoke enters valve body 1 from air inlet 121, torsional spring 34 discharges elastic potential energy, makes connecting plate
31 rotate around the first pivot 33, to realize that valve block 3 closes air outlet 122；Why the repeat switch of valve block 3 can be realized,
It is the normal work because of temperature-sensing element 47：One end of temperature-sensing element 47 is fixed on holder 44 at this time and the other end then extends to
It is buckled on the outer surface of plectrum 45, and between them by the compression of elastic component 46, plectrum 45, locking plate 42 and limited block 41 are phases
Mutually it is detached from.But when fire behavior is generated in flue and when spreading at fire-preventing check valve, temperature-sensing element 47 by thermal damage or fusing and
It can not effectively realize that the clamping to holder 44 and plectrum 45, elastic component 46 discharge elastic potential energy so that plectrum 45 is around the second pivot
48 rotations so that limited block 41 is inserted into two upper ends of 45 synchronous drive locking plate of plectrum, 42 upward sliding, Y types locking plate 42
Valve block 3 is securely limited in box cover state in locking gap 411.
The above embodiments merely illustrate the technical concept and features of the present invention, and its object is to allow person skilled in the art
Scholar cans understand the content of the present invention and implement it accordingly, and it is not intended to limit the scope of the present invention, all according to the present invention
Equivalent change or modification made by Spirit Essence, should be covered by the protection scope of the present invention.
Claims (10)
1. a kind of fire-preventing check valve, it includes：
Valve body（1）, the valve body（1）Including ventilation duct（12）And it is formed in the ventilation duct（12）The support plate of circumferential surface
（11）, the ventilation duct（12）With air inlet（121）And air outlet（122）；
Valve block（3）, the valve block（3）With the valve body（1）Phase pivot connect and with the air outlet（122）It matches；
It is characterized in that, it further includes：
Locking mechanism（4）, the locking mechanism（4）Including being mounted on the ventilation duct（12）On circumferential surface and extend to beyond described
Air outlet（122）Multiple limited blocks（41）, be slidably mounted in the valve block（3）Surface and with the limited block（41）Phase
The locking plate of cooperation（42）, one end be mounted on the ventilation duct（12）The holder of circumferential surface（44）And the holder（44）Phase pivot
Connection and with the locking plate（42）Corresponding plectrum（45）, be arranged in the holder（44）With the plectrum（45）Between
Elastic component（46）And the connection holder（44）With the plectrum（45）Temperature-sensing element（47）；
The locking mechanism（4）With unlock and locking two states, when its is in the unlocked state, the elastic component（46）Quilt
Compression, the locking plate（42）With the limited block（41）It is separated；When it is in the lock state, the temperature-sensing element（47）
By thermal damage, the elastic component（46）Drive the plectrum（45）The relatively described holder（44）Rotation makes the locking plate（42）Together
Step sliding, the locking plate（42）With the limited block（41）Mutually it is clamped.
2. fire-preventing check valve according to claim 1, it is characterised in that：The locking plate（42）On offer multiple waist types
Hole（421）, the locking plate（42）By with the waist-shaped hole（421）Matched multigroup bolt pair（43）It is slidably mounted
In the valve block（3）On.
3. fire-preventing check valve according to claim 1, it is characterised in that：The valve block（3）Surface on connection is installed
Plate（31）, the connecting plate（31）By being arranged in the first pivot therein（33）With the holder（44）Phase pivot connects, institute
State the first pivot（33）On be arranged with and resist the connecting plate（31）With the holder（44）Torsional spring（34）.
4. fire-preventing check valve according to claim 3, it is characterised in that：The connecting plate（31）End be formed with and its
Perpendicular limited block（32）, the locking plate（42）In with the plectrum（45）Matched one end, which is formed, runs through the limit
Position block（32）Convex block（422）.
5. fire-preventing check valve according to claim 3, it is characterised in that：The connecting plate（31）Surface be formed with and institute
State convex block（422）It is corresponding and with the plectrum（45）Matched guiding skewback（35）.
6. fire-preventing check valve according to claim 3, it is characterised in that：The holder（44）Including being mounted on the ventilation
Pipe（12）The first connecting portion of circumferential surface（441）And with the first connecting portion（441）Free end integrally connected and formed
The second connecting portion at obtuse angle（442）, the connecting plate（31）Positioned at the first connecting portion（441）With the second connecting portion
（442）Between.
7. fire-preventing check valve according to claim 1, it is characterised in that：The limited block（41）On offer and the lock
Stator（42）Matched locking gap（411）.
8. fire-preventing check valve according to claim 1, it is characterised in that：The holder（44）The other end by being arranged in
Second pivot therein（48）With the plectrum（45）Phase pivot connects, the elastic component（46）It is sheathed on second pivot
（48）On.
9. fire-preventing check valve according to claim 1, it is characterised in that：It further includes being mounted on the support plate（11）Table
Face and with the air outlet（122）Corresponding wind scooper（2）And it is mounted on the wind scooper（2）At least one set of side is solid
Surely ear is turned round（5）.
10. fire-preventing check valve according to claim 1, it is characterised in that：The ventilation duct（12）Described in air outlet
（122）Residing end face forms fluted（23）, the valve block（3）Edge be formed with and the groove（23）It is matched
Sealing（301）.
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 true CN108488445A (en) | 2018-09-04 |
| CN108488445B 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) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357053A (en) * | 2018-12-05 | 2019-02-19 | 西安友谊燃气设备有限公司 | Part and two-flow dual control self-closing valve is automatically closed in a kind of super flow |
| CN113048272A (en) * | 2021-03-27 | 2021-06-29 | 浙江尚扬通风设备有限公司 | Smoke-discharging fire-proof valve |
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| 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
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| 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 |
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| 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 |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109357053A (en) * | 2018-12-05 | 2019-02-19 | 西安友谊燃气设备有限公司 | Part and two-flow dual control self-closing valve is automatically closed in a kind of super flow |
| 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 |
| CN113048272A (en) * | 2021-03-27 | 2021-06-29 | 浙江尚扬通风设备有限公司 | Smoke-discharging fire-proof valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108488445B (en) | 2023-12-22 |
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