CN107631034B - Auxiliary opening mechanism of flue check valve - Google Patents
Auxiliary opening mechanism of flue check valve Download PDFInfo
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- CN107631034B CN107631034B CN201710888148.7A CN201710888148A CN107631034B CN 107631034 B CN107631034 B CN 107631034B CN 201710888148 A CN201710888148 A CN 201710888148A CN 107631034 B CN107631034 B CN 107631034B
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- 230000007246 mechanism Effects 0.000 title claims abstract description 20
- 238000009434 installation Methods 0.000 claims abstract description 6
- 238000007789 sealing Methods 0.000 claims description 46
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000010030 laminating Methods 0.000 abstract description 2
- 230000007774 longterm Effects 0.000 abstract description 2
- 230000002708 enhancing effect Effects 0.000 abstract 1
- 239000000779 smoke Substances 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 3
- 239000011324 bead Substances 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000003546 flue gas Substances 0.000 description 1
- 239000003517 fume Substances 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 239000000741 silica gel Substances 0.000 description 1
- 229910002027 silica gel Inorganic materials 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- Check Valves (AREA)
- Lift Valve (AREA)
Abstract
The invention provides an auxiliary opening mechanism of a flue check valve, and belongs to the technical field of pipeline structures. The valve plate solves the problem that the valve plate cannot be opened after long-term use in the prior art. This auxiliary opening mechanism of flue check valve, the flue check valve includes casing and a plurality of valve block, annular seal keeps off the edge in the casing, the valve block edge can keep off along laminating mutually or separately with annular seal, the casing has air inlet end and air-out end, a serial communication port, this auxiliary opening mechanism includes the pendulum rod, the inside installation cavity that has of valve block, the pendulum rod swing sets up in the installation cavity, valve block is close to air inlet end one side and has opening one and opening two, be equipped with an elastic pad on the opening one, the one end and the elastic pad of pendulum rod contact, opening two sets up in the edge of valve block, when the one end swing of elastic pad takes place deformation drive pendulum rod, the other end of pendulum rod can wear out opening two and lean on annular seal and keep off the edge. The invention has the advantage of enhancing the opening force of the valve plate.
Description
Technical Field
The invention belongs to the technical field of pipeline structures, and relates to an auxiliary opening mechanism of a flue check valve.
Background
In the kitchen of using vertical public flue, in order to prevent the oil smoke in the flue from flowing backwards in the kitchen, generally set up the check valve between integrated kitchen or range hood and public flue and separate, the check valve that uses in the market at present still exists the oil smoke to flow backward, the unsmooth scheduling phenomenon of discharging fume still can't eradicate.
Sealing working principle of the existing check valve: the valve plate with sealing function in the check valve is opened by exhaust force, and when the exhaust force disappears, the valve plate is closed under the action of gravity and return spring force. Analysis of the general principle will find that the opening and closing forces in such a configuration are contradictory and that a pair of forces is difficult to reconcile.
If the smooth exhaust is ensured as the design direction, the weight or spring force of the valve plate cannot be too large, so that the force for closing the valve plate is limited, the valve plate cannot be effectively sealed due to the negative pressure effect in the flue gas channel, a gap is formed between the valve plate and the sealing surface of the valve body, so that oil smoke flows backward, and the valve plate valve closing noise repeatedly occurs; on the contrary, if the sealing performance of the check valve is guaranteed, the reset spring force of the valve plate is required to be increased, and a sealing piece (such as silica gel) is additionally arranged on the sealing surface between the valve plate and the valve body, so that the defect is obvious, the valve plate needs to be opened, the sealing surface of the valve plate is easily adhered by oil dirt, the air exhaust is not smooth, or the valve plate cannot be opened, and the phenomena of incapability of blowing out of the air exhaust and incapability of discharging oil smoke occur.
Currently, as disclosed in chinese patent literature, a common flue smoke-discharging check valve is disclosed [ patent number: CN200920014665.2; authorized bulletin number: CN201443626U ]. The common flue smoke discharge check valve comprises a shell and a wind shield, wherein: one end of the shell is a smoke tube connecting end connected with a smoke tube, and the other end of the shell is a wall-in mounting end arranged on a wall body; the inside of the shell is provided with a hollow lumen which is provided with openings at two ends and is communicated with the inside of the wall-in mounting end, and the wind shield is arranged on a lumen passage inside the wall-in mounting end; the matched contact form between the wind shield and the shell is line contact; the wind shields which can open or close the tube cavity between the smoke tube connecting end and the wall-in mounting end are two. The smoke discharge check valve of the common flue still can cause the adhesion of the wind shield and the shell after long-term use, and the wind shield can not be opened under the condition of the same wind power.
Disclosure of Invention
The invention aims to solve the problems in the prior art, and provides an auxiliary opening mechanism of a flue check valve.
The aim of the invention can be achieved by the following technical scheme:
The utility model provides an auxiliary opening mechanism of flue check valve, the flue check valve includes casing and a plurality of valve block, the casing in have annular seal and keep off the edge, the valve block articulated in the casing, the valve block edge can keep off along laminating mutually or separate with annular seal, the casing have air inlet end and air-out end, its characterized in that, this auxiliary opening mechanism includes the pendulum rod, the valve block inside has the installation cavity, the pendulum rod swing sets up in the installation cavity, valve block is close to air inlet end one side and has opening one and opening two, be equipped with an elastic pad on the opening one, the one end of pendulum rod contacts with the elastic pad, opening two sets up in the edge of valve block, when the one end swing of elastic pad takes place deformation drive pendulum rod, the other end of pendulum rod can wear out opening two and lean on annular seal to keep off the edge and make valve block and separate with annular seal.
The working principle of the invention is as follows: when wind power enters the shell from the air inlet end, the elastic pad deforms inwards under the driving of the wind power, one end of the swing rod swings towards the air outlet end, according to the lever principle, the other end of the swing rod swings towards the air inlet end, when the other end of the swing rod passes through the opening II and swings to the annular sealing baffle edge, the other end of the swing rod cannot swing continuously due to the existence of the annular sealing baffle edge, the annular sealing baffle edge applies a reverse acting force to the other end of the swing rod, at the moment, the forces at the two ends of the swing rod are all directed towards the air outlet end, the edge of the valve plate is separated from the annular sealing baffle edge, the valve plate is in an open state, and the air inlet end is communicated with the air outlet end; the traditional check valve can only open the valve plate through the non-hinged end of the valve plate, and the edge of the valve plate and the annular sealing blocking edge are bonded after long-time use, so that the opening force is required to be large, and low-grade wind power cannot be opened; according to the invention, the lever principle is utilized, the swing rod applies an acting force to the annular sealing baffle edge, and the annular sealing baffle edge applies a reverse acting force to the valve plate to separate the edge of the valve plate from the annular sealing baffle edge.
The swing rod comprises a rod body and a rotating shaft vertically fixed on the rod body, the swing rod is also fixedly provided with a reinforcing ring, the axis of the reinforcing ring and the axis of the rotating shaft are positioned on the same straight line, the lower sheet body is provided with a first rotating seat and a second rotating seat, one end of the rotating shaft is rotationally arranged in the first rotating seat, the other end of the rotating shaft is rotationally arranged in the second rotating seat, one end, close to the second opening, of the swing rod is an outer end, one end, far away from the second opening, of the swing rod is an inner end, and the distance from the outer end to the rotating shaft is smaller than the distance from the inner end to the rotating shaft.
The lever principle is utilized, one end of the swing rod is a power arm, the other end of the swing rod is a resistance arm, the other end of the swing rod can swing through small wind force, the force generated by the other end of the swing rod is larger than the opening force of one end of the swing rod, and then according to the principle of the interaction force, the force generated by the other end of the swing rod is equal to the reverse acting force generated by the annular sealing baffle edge to the other end of the swing rod, so that the opening force of the valve plate is greatly enhanced, and the valve plate is relatively easy to open.
The valve plate comprises an upper sheet body and a lower sheet body, the upper sheet body is fixed with the lower sheet body, and the upper sheet body is close to the air inlet end.
By adopting the structure, the valve plate is provided with the mounting cavity, and a swinging space is formed for swinging the swing rod.
The lower sheet body on set up flutedly, the recess be the bowl form, the one end of pendulum rod can swing to in the recess, the notch of recess set up annular draw-in groove, the edge of elastic pad be equipped with annular draw-in groove assorted annular sand grip, annular sand grip is in annular draw-in groove.
By adopting the structure, the groove can reserve a swinging space for swinging one end of the swinging rod, and the elastic pad can be fixed on the lower sheet body in a clamping manner.
One surface of the elastic pad, which is close to the swing rod, is provided with a fixed ring, one end of the swing rod is arranged in the fixed ring in a penetrating way, and one end of the swing rod is connected with the groove through a pressure-bearing spring.
By adopting the structure, the elastic pad can swing the swing rod when being deformed inwards, and the bearing pressure can reset one end of the swing rod when no wind force acts.
The bottom of the groove is provided with a fixed groove, one end of the pressure-bearing spring is positioned in the fixed groove, and the other end of the pressure-bearing spring is abutted against one end of the swing rod.
By adopting the structure, the pressure-bearing spring can be fixed in the groove to prevent the pressure-bearing spring from deviating.
The elastic pad comprises a middle part, an annular groove and an outer part, wherein the height of the middle part is the same as that of the outer part, the annular groove is arranged between the middle part and the outer part, and an annular inclined edge is arranged between the annular groove and the middle part.
The annular inclined edge and the middle part form a gradient, and the gradient near the outer end is larger than the gradient near the inner end.
By adopting the structure, according to the stress direction of the swing rod, the part with large ramp is easy to deform due to large stress.
The valve plate is fixed with a magnetic attraction seat, the annular sealing baffle edge is fixed with a permanent magnet, the permanent magnet corresponds to the magnetic attraction seat, the outer end of the valve plate is provided with a bulge, and the swing rod and the permanent magnet are positioned on the same straight line on the horizontal projection plane.
By adopting the structure, in the valve block attaching state, the valve block and the annular sealing baffle edge are firmly attached through the permanent magnet and the magnetic attraction seat, and the permanent magnet is separated from the magnetic attraction seat through the bulge. Thereby separating the valve plate from the annular sealing bead.
The edge of the valve plate is also provided with a sealing gasket.
By adopting the structure, the sealing performance between the valve plate and the annular sealing baffle edge is better.
Compared with the prior art, the invention has the following advantages:
1. According to the invention, the elastic pad and the swing rod are arranged, so that the valve plate opening force is greatly enhanced.
2. According to the invention, the magnetic suction seat and the permanent magnet are arranged, so that the valve plate closing state is not influenced by negative pressure to generate noise.
3. According to the invention, the bulge is arranged, so that the acting force is relatively concentrated when the valve plates are separated, and the valve plates are more convenient to open.
Drawings
Fig. 1 is a schematic perspective view of the present invention.
Fig. 2 is a cross-sectional view of a valve sheet of the present invention.
Fig. 3 is a transverse cross-sectional view of the present invention.
Fig. 4 is an enlarged view at a in fig. 3.
FIG. 5 is a schematic view of the front and back sides of an elastic pad according to the present invention.
Fig. 6 is a partial schematic view of the valve plate after the swing rod and the elastic pad are removed.
Fig. 7 is a partial schematic view of the upper panel after removal.
In the figure, 1, a shell; 2. a valve plate; 2a, upper sheet body; 2b, a lower sheet body; 3. an annular sealing stop edge; 4. an elastic pad; 4a, middle part; 4b, an annular groove; 4c, outside; 4d, an annular inclined edge; 5. swing rod; 5a, a rod body; 5b, a rotating shaft; 5c, a bulge; 5d, reinforcing rings; 6. a mounting cavity; 7. an opening I; 8. an opening II; 9. a first rotating seat; 10. a second rotating seat; 11. a groove; 12. an annular clamping groove; 13. annular raised strips; 14. a fixing ring; 15. a pressure-bearing spring; 16. a fixing groove; 17. a permanent magnet; 18. a magnetic attraction seat.
Detailed Description
The following are specific embodiments of the present invention and the technical solutions of the present invention will be further described with reference to the accompanying drawings, but the present invention is not limited to these embodiments.
As shown in fig. 1, fig. 2, fig. 3, fig. 4, fig. 5 and fig. 6, an auxiliary opening mechanism of a flue check valve comprises a shell 1 and two valve plates 2, wherein an annular sealing baffle edge 3 is arranged in the shell 1, the valve plates 2 are hinged in the shell 1, the edge of each valve plate 2 can be attached to or detached from the annular sealing baffle edge 3, the shell 1 is provided with an air inlet end and an air outlet end, the auxiliary opening mechanism comprises a swing rod 5, each valve plate 2 comprises an upper sheet body 2a and a lower sheet body 2b, the upper sheet body 2a is fixed with the lower sheet body 2b, the upper sheet body 2a is close to the air inlet end, the valve plates 2 are provided with a mounting cavity 6, the swing rod 5 is arranged in the mounting cavity 6 in a swinging way, one side of each valve plate 2 close to the air inlet end is provided with an opening I7 and an opening II 8, an elastic pad 4 is arranged on the opening I7, one end of the swing rod 5 is contacted with the elastic pad 4, the opening II 8 is arranged at the edge of the valve plate 2, when the elastic pad 4 deforms to drive one end of the swing rod 5 to swing, the other end of the swing rod 5 can penetrate through the opening II 8 to prop against the annular sealing baffle edge 3 and separate the valve plate 2 from the annular sealing baffle edge 3, the swing rod 5 comprises a rod body 5a and a rotating shaft 5b vertically fixed on the rod body 5a, a reinforcing ring 5d is further fixed on the swing rod, the axis of the reinforcing ring 5d and the axis of the rotating shaft 5b are positioned on the same straight line, the lower sheet body 2b is provided with a first rotating seat 9 and a second rotating seat 10, one end of the rotating shaft 5b is rotatably arranged in the first rotating seat 9, the other end of the rotating shaft 5b is rotatably arranged in the second rotating seat 10, one end of the swing rod 5 close to the opening II 8 is an outer end, one end of the swing rod 5 far away from the opening II 8 is an inner end, and the distance from the outer end to the rotating shaft 5b is smaller than the distance from the inner end to the rotating shaft 5 b.
By utilizing the lever principle, one end of the swing rod 5 is a power arm, the other end of the swing rod 5 is a resistance arm, the other end of the swing rod 5 can be swung through smaller wind force, the force generated by the other end of the swing rod 5 is larger than the opening force of one end of the swing rod 5, and then according to the principle of interaction force, the force generated by the other end of the swing rod 5 is equal to the reverse acting force generated by the annular sealing baffle edge 3 on the other end of the swing rod 5, so that the opening force of the valve plate 2 is greatly enhanced, and the valve plate 2 is relatively easy to open.
As shown in fig. 7, the lower sheet 2b is provided with a groove 11, the groove 11 is bowl-shaped, one end of the swing rod 5 can swing into the groove 11, the notch of the groove 11 is provided with an annular clamping groove 12, the edge of the elastic pad 4 is provided with an annular raised strip 13 matched with the annular clamping groove 12, and the annular raised strip 13 is positioned in the annular clamping groove 12.
With the structure, the groove 11 can reserve a swinging space for swinging one end of the swinging rod 5, and the elastic pad 4 can be fixed on the lower sheet body 2b in a clamping manner.
As shown in fig. 5, a fixing ring 14 is arranged on one surface of the elastic pad 4, which is close to the swing rod 5, one end of the swing rod 5 is penetrated in the fixing ring 14, and one end of the swing rod 5 is connected with the groove 11 through a pressure-bearing spring 15.
With the adoption of the structure, the elastic pad 4 can swing the swing rod 5 when being deformed inwards, and the bearing pressure can reset one end of the swing rod 5 when no wind force acts.
As shown in fig. 7, a fixed slot 16 is formed at the bottom of the groove 11, one end of the pressure spring 15 is positioned in the fixed slot 16, and the other end of the pressure spring 15 abuts against one end of the swing rod 5.
With the above structure, the pressure spring 15 can be fixed in the groove 11, preventing it from being deviated.
As shown in fig. 5, the elastic pad 4 includes a middle portion 4a, an annular groove 4b, and an outer portion 4c, the middle portion 4a is the same in height as the outer portion 4c, the annular groove 4b is located between the middle portion 4a and the outer portion 4c, and an annular inclined edge 4d is further provided between the annular groove 4b and the middle portion 4 a.
The annular inclined edge 4d forms a slope with the middle portion 4a, the slope near the outer end being greater than the slope near the inner end.
With the structure, the large part of the ramp is easy to deform due to large stress according to the stress direction of the swing rod 5.
As shown in fig. 4, a magnetic suction seat 18 is fixed on the valve plate 2, a permanent magnet 17 is fixed on the annular sealing baffle edge 3, the permanent magnet 17 corresponds to the magnetic suction seat 18 in position, a bulge 5c is arranged at the outer end, and the swing rod 5 and the permanent magnet 17 are positioned on the same straight line on the horizontal projection plane.
With the above structure, in the attaching state of the valve plate 2, the valve plate 2 and the annular sealing baffle edge 3 are firmly attached through the permanent magnet 17 and the magnetic attraction seat 18, and the permanent magnet 17 and the magnetic attraction seat 18 are separated through the protrusion 5 c. Thereby separating the valve plate 2 from the annular sealing bead 3.
The edge of the valve plate 2 is also provided with a sealing gasket. By adopting the structure, the sealing performance between the valve plate 2 and the annular sealing baffle edge 3 is better. The casing 1 is internally fixed with a fixed column, a torsion spring is fixed on the fixed column, one end of the torsion spring is fixed with the valve plate 2 on the left side, and the other end of the torsion spring is fixed with the valve plate 2 on the right side. By adopting the above, the valve plate 2 can be automatically reset.
The working principle of the invention is as follows: when wind power enters the shell 1 from the air inlet end, when the elastic pad 4 is deformed under the drive of wind power, the elastic pad 4 deforms inwards, one end of the swing rod 5 swings towards the air outlet end, according to the lever principle, the other end of the swing rod 5 swings towards the air inlet end, when the other end of the swing rod 5 swings to the annular sealing baffle edge 3 through the opening II 8, the other end of the swing rod 5 cannot continue swinging due to the existence of the annular sealing baffle edge 3, the annular sealing baffle edge 3 applies a reverse acting force to the other end of the swing rod 5, at the moment, the forces at the two ends of the swing rod 5 are all directed towards the air outlet end, the edge of the valve plate 2 is separated from the annular sealing baffle edge 3, the valve plate 2 is in an open state, and the air inlet end is communicated with the air outlet end; the conventional check valve can only open the valve plate 2 through the non-hinged end of the valve plate 2, and the edge of the valve plate 2 and the annular sealing blocking edge 3 are bonded after long-time use, so that the opening force is required to be large, and low-grade wind power cannot be opened; according to the invention, the lever principle is utilized, the swing rod 5 applies an acting force to the annular sealing baffle edge 3, the annular sealing baffle edge 3 applies a reverse acting force to the valve plate 2, and the edge of the valve plate 2 is separated from the annular sealing baffle edge 3.
The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Those skilled in the art may make various modifications or additions to the described embodiments or substitutions thereof without departing from the spirit of the invention or exceeding the scope of the invention as defined in the accompanying claims.
Although the housing 1 is used more herein; a valve plate 2; an upper sheet body 2a; a lower sheet body 2b; an annular sealing baffle edge 3; an elastic pad 4; a middle part 4a; an annular groove 4b; an outer portion 4c; an annular inclined edge 4d; a swing rod 5; a rod body 5a; a rotating shaft 5b; a protrusion 5c; a reinforcing ring 5d; a mounting cavity 6; opening one 7; opening two 8; the first rotating seat 9; a second rotating seat 10; a groove 11; an annular clamping groove 12; annular protruding strips 13; a fixing ring 14; a pressure spring 15; a fixing groove 16; a permanent magnet 17; the magnetic attraction seat 18 and the like, but the possibility of using other terms is not excluded. These terms are used merely for convenience in describing and explaining the nature of the invention; they are to be interpreted as any additional limitation that is not inconsistent with the spirit of the present invention.
Claims (8)
1. The auxiliary opening mechanism is characterized in that the auxiliary opening mechanism comprises a swinging rod, an installation cavity is formed in the valve plate, the swinging rod is arranged in the installation cavity in a swinging mode, one side of the valve plate, close to the air inlet end, is provided with an opening I and an opening II, an elastic pad is arranged on the opening I, one end of the swinging rod is contacted with the elastic pad, the opening II is arranged at the edge of the valve plate, when the elastic pad deforms to drive one end of the swinging rod to swing, the other end of the swinging rod can penetrate through the opening II to lean against the annular sealing edge and separate the valve plate from the annular sealing edge, the valve plate comprises an upper sheet body and a lower sheet body, the upper sheet body is fixed with the lower sheet body, the upper sheet body is close to the air inlet end, the swinging rod comprises a rod body and a rotating shaft vertically fixed on the rod body, the axis of the swinging rod is further fixed with a reinforcing ring, the axis of the reinforcing ring and the axis of the rotating shaft are located on the same straight line, the first rotating seat and the second rotating seat is arranged at the other end of the rotating seat is far away from the rotating shaft, and the second rotating seat is arranged at the outer end of the second rotating seat is far away from the rotating seat, and the first rotating seat is arranged at the rotating seat is far from the rotating seat.
2. The auxiliary opening mechanism of the flue check valve according to claim 1, wherein the lower sheet body is provided with a groove, the groove is bowl-shaped, one end of the swing rod can swing into the groove, the notch of the groove is provided with an annular clamping groove, the edge of the elastic pad is provided with an annular raised line matched with the annular clamping groove, and the annular raised line is positioned in the annular clamping groove.
3. The auxiliary opening mechanism of the flue check valve according to claim 1 or 2, wherein one surface of the elastic pad, which is close to the swinging rod, is provided with a fixed ring, one end of the swinging rod is penetrated in the fixed ring, and one end of the swinging rod is connected with the groove through a pressure-bearing spring.
4. The auxiliary opening mechanism for the flue check valve according to claim 3, wherein a fixing groove is formed in the bottom of the groove, one end of the pressure-bearing spring is located in the fixing groove, and the other end of the pressure-bearing spring abuts against one end of the swing rod.
5. The auxiliary opening mechanism for flue check valve according to claim 1 or 2, wherein the elastic pad comprises a middle part, an annular groove and an outer part, the middle part is the same as the outer part in height, the annular groove is arranged between the middle part and the outer part, and an annular inclined edge is arranged between the annular groove and the middle part.
6. The auxiliary opening mechanism for a flue check valve according to claim 5, wherein the annular sloped edge slopes with the middle portion, and the slope near the outer end is greater than the slope near the inner end.
7. The auxiliary opening mechanism of the flue check valve according to claim 1 or 2, wherein the valve plate is fixedly provided with a magnetic attraction seat, the annular sealing baffle edge is fixedly provided with a permanent magnet, the permanent magnet corresponds to the magnetic attraction seat, the outer end is provided with a bulge, and the swing rod and the permanent magnet are positioned on the same straight line on a horizontal projection plane.
8. The auxiliary opening mechanism of flue check valve according to claim 1 or 2, wherein the edge of the valve plate is further provided with a gasket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888148.7A CN107631034B (en) | 2017-09-27 | 2017-09-27 | Auxiliary opening mechanism of flue check valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710888148.7A CN107631034B (en) | 2017-09-27 | 2017-09-27 | Auxiliary opening mechanism of flue check valve |
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| Publication Number | Publication Date |
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| CN107631034A CN107631034A (en) | 2018-01-26 |
| CN107631034B true CN107631034B (en) | 2024-05-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710888148.7A Active CN107631034B (en) | 2017-09-27 | 2017-09-27 | Auxiliary opening mechanism of flue check valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108662213A (en) * | 2018-06-26 | 2018-10-16 | 珠海格力电器股份有限公司 | Check-valves and its ventilation equipment |
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