CN205877295U - Fire -proof check valve - Google Patents
Fire -proof check valve Download PDFInfo
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- CN205877295U CN205877295U CN201620865690.1U CN201620865690U CN205877295U CN 205877295 U CN205877295 U CN 205877295U CN 201620865690 U CN201620865690 U CN 201620865690U CN 205877295 U CN205877295 U CN 205877295U
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- fire
- driving lever
- check valve
- rotating shaft
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Abstract
The utility model relates to a fire -proof check valve, solve fire -proof check valve be the isolated not good problem of flue gas effect under indoor accidental fire situation. A fire -proof check valve, includes body, valve block and coupling mechanism, be equipped with the gas vent on the body, the valve block lid is established on the gas vent, the body with the valve block passes through coupling mechanism connects, fire -proof check valve still includes driving lever, fuse and elastic element, the driving lever with the body rotates to be connected, fuse fixes on the body, elastic element one end with this body coupling, the elastic element other end with the driving lever is connected and the drive the driving lever with fuse offsets, coupling mechanism is last be equipped with towards the portion that dodges of valve block, fuse melts the back, elastic element orders about the driving lever is relative the body rotates and the extrusion dodge the portion, so that coupling mechanism passes through the valve block is closed the gas vent.
Description
Technical field
This utility model relates to a kind of fire-preventing check valve.
Background technology
Fire-preventing check valve includes valve body, valve block, torsion spring and connecting rod, and valve body has air inlet and air outlet, and valve block lid is located at
On air outlet, connecting rod one end is rotationally connected with valve body, and the connecting rod other end is rotationally connected with valve block, when torsion spring drive link is relative to valve
When body rotates, valve block can close air outlet.But, when fire-preventing check valve carries out security performance test, testing staff finds
In the case of indoor catch fire, valve block cannot completely close air outlet, and this can cause the flue gas of indoor to enter row through fire-preventing check valve
In fume pipeline.
Summary of the invention
Problem to be solved in the utility model is just to provide a kind of fire-preventing check valve, improves fire-preventing check valve in indoor mistake
The effect of flue gas is completely cut off under fire situation.
For solving the problems referred to above, this utility model following technical scheme of offer:
A kind of fire-preventing check valve, including body, valve block and bindiny mechanism, described body is provided with air vent, described valve block
Lid is located on described air vent, and described body is connected by described bindiny mechanism with described valve block, and described fire-preventing check valve also wraps
Including driving lever, fuse member and flexible member, described driving lever is rotationally connected with described body, and described fuse member is fixed on described body
On, described flexible member one end is connected with described body, and the described flexible member other end is connected with described driving lever and drives described
Driving lever offsets with described fuse member, and described bindiny mechanism is provided with the relief portion towards described valve block, after the fusing of described fuse member,
Described flexible member orders about described driving lever and rotates and extrude described relief portion relative to described body, so that described bindiny mechanism passes through
Described valve block closes described air vent.
Fire-preventing check valve of the present utility model includes driving lever and flexible member, and driving lever is rotationally connected with body, flexible member
One end is connected with body, and its other end is connected with driving lever, and when flexible member release elastic potential energy when, driving lever can opposing body
Rotating, driving lever opposing body extrudes bindiny mechanism, so that bindiny mechanism closes air vent by valve block after rotating.It is so designed that,
The rotating force that bindiny mechanism is subject to will be increased, and when the rotating force that bindiny mechanism is subject to increases, connects machine
Structure passes to the pulling force of valve block also can be increased, and this will be effectively improved fire-preventing check valve and completely cut off flue gas under indoor catch fire situation
Effect.
Certainly, driving lever of the present utility model and flexible member, it is also possible to improve fire-preventing check valve under outdoor catches fire situation
The effect of isolation flue gas.
Bindiny mechanism of the present utility model is provided with the relief portion towards valve block, and due to flexible member, can to order about driving lever relative
Body rotates and extrudes relief portion, therefore, for extruding the part of relief portion between bindiny mechanism and valve block on driving lever, this
It is intended that when the hands of user at touching driving lever before the part extruding relief portion, need to initially pass through bindiny mechanism.So
Design, bindiny mechanism can avoid the hands of user to be clamped between driving lever and relief portion, to realize adding fire-preventing check valve
Security performance.
Fire-preventing check valve of the present utility model also includes fuse member, and fuse member is fixed on body, and flexible member drives to be dialled
Bar offsets with fuse member, it means that under normal temperature environment, flexible member cannot drive driving lever to extrude bindiny mechanism.So
Design, effectively reduces valve block and opens the resistance suffered by air vent in normal circumstances.
Further, described driving lever is provided with rotating shaft, and described body is provided with the axis hole coordinated with described rotating shaft, described turn
After axle inserts described axis hole, described driving lever can rotate relative to described body.It is so designed that, reduces the manufacture difficulty of body.
Further, described rotating shaft includes the first rotating shaft and the second rotating shaft, and described driving lever includes being provided with described first turn
First linkage section of axle, it is provided with the second linkage section of described second rotating shaft and drives section, described first linkage section and described the
Two linkage sections are connected by described driving section, and described driving lever, after described body rotates, is kept away described in described driving section is squeezable
Allow portion.It is so designed that, alleviates the weight of driving lever.
Further, described second linkage section is provided with gag lever post, described flexible member act on described gag lever post with
Keep the trend that described driving lever offsets with described fuse member.It is so designed that, flexible member easy accessibility.
Further, described gag lever post and described second shaft parallel.Be so designed that, optimize gag lever post and the second rotating shaft it
Spacing distance needed between.
Further, described flexible member is enclosed within described second rotating shaft.It is so designed that, limits the installation position of flexible member
Put.
Further, described body includes that connecting shaft, described bindiny mechanism include connecting rod and be fixed on described connecting rod
Axle sleeve, described relief portion is arranged on described connecting rod, and described axle sleeve is enclosed within described connecting shaft and the two is threaded.So
Design, increases the stability during connecting rod rotates around the axis.
Further, described axle sleeve includes first annular section and the second ring segment being fixed on described connecting rod, described the
The outline of one ring segment radial cross-section is circular.
Further, described first annular section is provided with the first screwed hole, and described second ring segment is provided with and described
The second screwed hole that one screwed hole is corresponding.
Further, described connecting rod includes the first linkage section and the second linkage section being connected with described axle sleeve, described first
Linkage section is connected formation escape groove with described second linkage section, and described escape groove is described relief portion.
Accompanying drawing explanation
Fig. 1 is the fragmentary front view of fire-preventing check valve in this utility model preferred embodiment；
Fig. 2 is the top view of driving lever in this utility model preferred embodiment；
Fig. 3 is the side view of bindiny mechanism in this utility model preferred embodiment；
Fig. 4 is the sectional view of this utility model preferred embodiment bottom bracket axle；
Fig. 5 is the front view of this utility model preferred embodiment bottom bracket axle.
Detailed description of the invention
With reference to Fig. 1, a kind of fire-preventing check valve, including body, valve block, bindiny mechanism and the first flexible member 4, body is provided with
Air vent, valve block lid is located on air vent, and body is connected by bindiny mechanism with valve block.
With reference to Fig. 1, the body of the present embodiment includes valve body and the valve seat 8 being fixed on valve body, and valve body is provided with wind-guiding and leads to
Road, air-guiding aisle has air inlet and air outlet, and described air vent is air outlet, and valve block lid is located at air outlet, valve seat 8 with lead
Wind passage is connected by screw adjacent to the sidewall of air outlet；The body of the present embodiment also includes connecting shaft 31, bindiny mechanism and valve
Seat 8 is rotationally connected by connecting shaft 31, and the first flexible member 4 drive connection mechanism rotates around connecting shaft 31, to keep valve block to close
Close the trend of air outlet.In other embodiments of the present utility model, described air vent is air inlet, and valve block lid is located at air inlet
Place, valve seat is connected as a single entity by welding adjacent to the sidewall of air inlet with air-guiding aisle, or, valve seat and air-guiding aisle are adjacent to entering
The sidewall in air port passes through Stud connection；Additionally, in other embodiments of the present utility model, body includes valve body and rotating shaft, even
Connection mechanism is connected by axis of rotation with valve body.
Seeing figures.1.and.2, difference from prior art is: fire-preventing check valve also includes driving lever 5, fuse member 6 and bullet
Property element, wherein, be originally embodied as being easy to distinguishing described flexible member be referred to as the second flexible member 7.The driving lever 5 of the present embodiment with
Body is rotationally connected, and fuse member 6 is fixed on body, and second flexible member 7 one end is connected with body, and the second flexible member 7 is another
One end is connected with driving lever 5 and drives driving lever 5 to offset with fuse member 6, and bindiny mechanism is provided with the relief portion towards valve block, in fusing
After part 6 fusing, the second flexible member 7 drives driving lever 5 opposing body rotate and extrude relief portion, so that bindiny mechanism passes through valve block
Close air vent.
With reference to Fig. 1, the driving lever 5 of the present embodiment is provided with rotating shaft, and body is provided with the axis hole coordinated with rotating shaft, and rotating shaft is inserted
After axis hole, driving lever 5 can opposing body rotate.In other embodiments of the present utility model, driving lever is provided with axis hole, and body sets
Having rotating shaft, after axis hole is inserted in rotating shaft, driving lever can opposing body rotate.
Seeing figures.1.and.2, the rotating shaft of the present embodiment includes the first rotating shaft 521 and the second rotating shaft 531, the first rotating shaft 521 with
Second rotating shaft 531 is concordant, and driving lever 5 includes being provided with the first linkage section 52 of the first rotating shaft 521, being provided with the second rotating shaft 531
Second linkage section 53 and driving section 51, the first linkage section 52 is connected by driving section 51 with the second linkage section 53, the first linkage section
52, in concave after driving section 51 and the second linkage section 53 to connect, after driving lever 5 opposing body rotates, drive section 51 squeezable
Relief portion is concrete: the valve seat 8 of the present embodiment is provided with the first axis hole and the second axis hole, when the first axle is inserted in the first rotating shaft 521
Hole, and when the second axis hole is inserted in the second rotating shaft 531, driving lever 5 can rotate by opposite valve seat 8；Described driving section 51 includes lateral wall
511, after fuse member 6 high temperature melting, the second flexible member 7 discharges elastic potential energy and rotates with driving driving lever 5 opposite valve seat 8, is dialling
In bar 5 opposite valve seat 8 rotation process, section 51 is driven to move downward, to realize driving the lateral wall 511 of section 51 to extrude relief portion,
When the lateral wall 511 driving section 51 extrudes relief portion, bindiny mechanism rotates around connecting shaft 31, to realize valve block closedown aerofluxus
Mouthful.In other embodiments of the present utility model, driving lever includes linkage section and drives section, and the first rotating shaft and the second rotating shaft are connected to
The two ends of linkage section, drive section to be connected with the centre position of linkage section, and the two are mutually perpendicular to, and driving lever opposing body rotates
After, drive the squeezable relief portion of section.
With reference to Fig. 1, bindiny mechanism includes connecting rod 1 and the axle sleeve 2 being fixed on connecting rod 1, and relief portion is arranged on connecting rod 1,
Axle sleeve 2 is enclosed within connecting shaft 31 and the two is threaded.In other embodiments of the present utility model, bindiny mechanism includes even
Bar, connecting rod is threadeded with connecting shaft；Or, connecting rod outline is circular, and rotating shaft is provided with through hole, and connecting rod runs through through hole.
With reference to Fig. 1 and Fig. 3, the connecting rod 1 of the present embodiment includes the first linkage section 11 and the second linkage section being connected with axle sleeve 2
12, the first linkage section 11 is connected formation escape groove 20 with the second linkage section 12, and escape groove 20 is described relief portion, concrete: the
One linkage section 11 is connected formation angle a, a ＜ 90 ° with the second linkage section 12, it means that escape groove 20 is positioned at the first connection
The angle between the first cell wall 111 and the escape groove 20 second cell wall 121 on the second linkage section 12 in section 11 is less than
90 °, when the lateral wall 511 driving section 51 extrudes relief portion, the second cell wall 121 offsets and opposite exterior lateral sides wall with lateral wall 511
511 slide, and are rotated around connecting shaft 31 by axle sleeve 2 realizing connecting rod 1.In other embodiments of the present utility model, connecting rod bag
Include the first linkage section, the second linkage section and for connecting the 3rd linkage section of the first linkage section and the second linkage section, axle sleeve and
Two linkage sections connect, and wherein, the 3rd linkage section and the second linkage section connect formation escape groove, and escape groove is relief portion.Additionally,
In other embodiments of the present utility model, the shape of escape groove includes arc, square, polygon etc..
With reference to Fig. 3 and Fig. 5, the axle sleeve 2 of the present embodiment includes first annular section 21 and the second annular being fixed on connecting rod 1
Section 22, the outline of first annular section of 21 radial cross-sections is circular, and the first flexible member 4 is enclosed within first annular section 21.As
This design, can reduce the frictional resistance by axle sleeve 2 in the first flexible member 4 work process.In other realities of the present utility model
Executing in example, the outline of first annular section of radial cross-section can be polygon, described polygon include tetragon, pentagon,
Hexagon.
With reference to Fig. 3 and Fig. 5, second linkage section 12 of the present embodiment is provided with installing hole 122, axle sleeve 2 penetrating mounting holes 122
After, the second ring segment 22 is connected with the hole wall of installing hole 122.In other embodiments of the present utility model, connecting rod is provided with fixed
Position groove, the side cell wall of locating slot is provided with the first opening, and the opposite side cell wall of locating slot is provided with the second opening, the first opening
Corresponding with the second opening, when axle sleeve inserts locating slot, first annular section extends to outside the first opening, and the second ring segment extends to
Outside second opening.
With reference to Fig. 3 and Fig. 5, outside the cross section of the installing hole 122 of the present embodiment and the second ring segment 22 radial cross-section
Profile is polygon, concrete: the cross section of installing hole 122 is hexagon, the outline of the second ring segment 22 radial cross-section
For hexagon.In other embodiments of the present utility model, outside the cross section of installing hole and the second ring segment radial cross-section
Profile can be circle, tetragon, heptagon etc..
With reference to Fig. 3 and Fig. 5, when axle sleeve 2 penetrating mounting holes 122, the second ring segment 22 is linked as one after welding with connecting rod 1
Body.In other embodiments of the present utility model, the second ring segment is threadeded with connecting rod；Or, the second ring segment and company
Bar is one-body molded.
It is not difficult to find out from Fig. 3, owing to installing hole 122 is arranged on the end of the second linkage section 12, therefore, the second linkage section 12
End can be used for stoping driving section 51 to exit escape groove 20.
With reference to Fig. 1 and Fig. 4, first annular section 21 of the present embodiment is provided with the first installing hole 211, on the second ring segment 22
Being provided with second installing hole 221 corresponding with the first installing hole 211, the first installing hole 211 and the second installing hole 221 are spliced to form use
In the installation passage of connection connecting shaft 31, and the first installing hole 211 and the second installing hole 221 are screwed hole；New in this practicality
In other embodiments of type, the first installing hole is screwed hole, and the second installing hole is the through hole that hole wall is smooth；Or, the second peace
Dress hole is screwed hole, and the first installing hole is the through hole that hole wall is smooth.
With reference to Fig. 1, first flexible member 4 of the present embodiment is torsion spring, and wherein, the first flexible member 4 is enclosed within axle sleeve 2,
First flexible member 4 one end is connected with connecting rod 1, and first flexible member 4 other end is connected with valve seat 8, concrete: the first elastic unit
Part 4 one end is connected on connecting rod 1, and first flexible member 4 other end is connected on valve seat 8.Implement at of the present utility model other
In example, valve seat is provided with the first hole, location, and connecting rod is provided with the second hole, location, and the first hole, location is inserted in first flexible member one end
In, the first flexible member other end inserts in the second hole, location.
Seeing figures.1.and.2, second flexible member 7 of the present embodiment is torsion spring, and the elastic force of the second flexible member 7 is more than the
The elastic force of one flexible member 4, wherein, the second flexible member 7 is enclosed within the second rotating shaft 531, concrete: the valve seat 8 of the present embodiment
Being provided with spacing hole, the second linkage section 53 is provided with gag lever post 532, and gag lever post 532 is parallel with the second rotating shaft 531, and second is elastic
Element 7 one end is inserted in spacing hole, and second flexible member 7 other end offsets with the lower surface of gag lever post 532.It is so designed that, the
Two flexible members 7 act on gag lever post 532 with the trend keeping driving lever 5 to offset with fuse member 6.Of the present utility model other
In embodiment, second flexible member one end is provided with retainer ring, described Fixing shrink ring on gag lever post, the second flexible member other end
It is welded on valve seat.
It should be understood that driving lever 5 moves according to lever principle, i.e. gag lever post 532 and driving section 51 is arranged on second even
The section of connecing 53 is positioned at the both sides of the second rotating shaft 531.
With reference to Fig. 2, it is preferred that gag lever post 532 is parallel with the second rotating shaft 531.In other embodiments of the present utility model,
Gag lever post and the second rotating shaft can also be not parallel.
With reference to Fig. 2, first linkage section 52 of the present embodiment is provided with pressing plate 522, and technical staff presses pressing plate 522 with hands
After, pressing plate 522 can drive driving lever 5 to extrude the second flexible member 7.
Seeing figures.1.and.2, first rotating shaft 521 of the present embodiment is provided with pad 9, pad 9 be positioned at the first linkage section 52 with
Between valve seat 8.
With reference to Fig. 1, fire-preventing check valve also includes screw, and the present embodiment is referred to as the first screw 3 for ease of distinguishing, and connects
Axle 31 is the bar portion of the first screw 3, and, the first screw 3 is threadeded with valve seat 8, to stop the first screw 3 opposite valve seat 8
Position is occurred to move.In other embodiments of the present utility model, fire-preventing check valve also includes bolt, and rotating shaft is the bar of bolt
Portion, and, bolt is fixed on valve seat by nut；Or, rotating shaft is one-body molded with valve seat.
With reference to Fig. 2, the bindiny mechanism of the present embodiment also includes that connector 40, connecting rod 1 are connected by connector 40 with valve block,
Concrete: fire-preventing check valve also includes the second screw 30 and the 3rd screw, and connecting rod 1 is provided with the second screw thread away from one end of axle sleeve 2
Hole 13, connector 40 is provided with first and dodges hole, and the second screw 30 is dodged hole through first and is connected with the second screwed hole 13, so that
Connector 40 is fixed on connecting rod 1；Valve block is provided with second and dodges hole, and connector 40 is additionally provided with the 3rd screwed hole, the 3rd spiral shell
Follow closely and dodge Kong Yu tri-screwed hole through second and connect, be fixed on valve block realizing connector 40.Of the present utility model its
In his embodiment, connecting rod is one-body molded with valve block；Or, valve block is fixed by screws on connecting rod, when valve block passes through screw
When being fixed on connecting rod, valve block can circumferentially rotate by screw relatively.
With reference to Fig. 2, it is preferred that connecting rod 1 is additionally provided with groove 14 away from one end of axle sleeve 2, when the 3rd screw is kept away through second
When allowing Kong Yu tri-screwed hole connect, groove 14 can avoid connector 40 to interfere with the 3rd screw.
With reference to Fig. 1, the fire-preventing check valve of the present embodiment also includes that locating part 10, locating part 10 are fixed on the sidewall of valve seat 8
On, when the second flexible member 7 orders about driving lever 5 and fuse member 6 side offsets, fuse member 6 opposite side offsets with locating part 10.When
Fire-preventing check valve is in course of normal operation, and locating part 10 can avoid fuse member 6 to occur position change to cause valve block to close row
QI KOU.
With reference to Fig. 1, it is preferred that described locating part 10 is fixed by welding on the sidewall of valve seat 8, wherein, described spacing
Part 10 is formed after melting for welding rod.In other embodiments of the present utility model, described locating part is in stud and alignment pin
A kind of.
The above, detailed description of the invention the most of the present utility model, but protection domain of the present utility model does not limit to
In this, those of ordinary skill in the art should be understood that this utility model includes but not limited to accompanying drawing and detailed description of the invention above
Described in content.Any amendment without departing from function of the present utility model and structural principle is intended to be included in claims
In scope.
Claims (10)
1. a fire-preventing check valve, including body, valve block and bindiny mechanism, described body is provided with air vent, described valve block lid
Being located on described air vent, described body is connected by described bindiny mechanism with described valve block, it is characterised in that described fire prevention is only
Returning valve and also include that driving lever, fuse member and flexible member, described driving lever are rotationally connected with described body, described fuse member is fixed on institute
Stating on body, described flexible member one end is connected with described body, and the described flexible member other end is connected with described driving lever and drives
Dynamic described driving lever offsets with described fuse member, and described bindiny mechanism is provided with the relief portion towards described valve block, described fuse member
After fusing, described flexible member orders about described driving lever and rotates and extrude described relief portion relative to described body, so that described connection
Mechanism closes described air vent by described valve block.
2. fire-preventing check valve as claimed in claim 1, it is characterised in that described driving lever is provided with rotating shaft, and described body sets
Having the axis hole coordinated with described rotating shaft, after described axis hole is inserted in described rotating shaft, described driving lever can rotate relative to described body.
3. fire-preventing check valve as claimed in claim 2, it is characterised in that described rotating shaft includes the first rotating shaft and the second rotating shaft,
Described driving lever includes being provided with the first linkage section of described first rotating shaft, being provided with the second linkage section of described second rotating shaft and drive
Dynamic section, described first linkage section is connected by described driving section with described second linkage section, and the most described body of described driving lever turns
After Dong, the squeezable described relief portion of described driving section.
4. fire-preventing check valve as claimed in claim 3, it is characterised in that described second linkage section is provided with gag lever post, described
Flexible member acts on described gag lever post with the trend keeping described driving lever to offset with described fuse member.
5. fire-preventing check valve as claimed in claim 4, it is characterised in that described gag lever post and described second shaft parallel.
6. fire-preventing check valve as claimed in claim 3, it is characterised in that described flexible member is enclosed within described second rotating shaft.
7. the fire-preventing check valve as described in one of claim 1 to 6, it is characterised in that described body includes connecting shaft, described company
Connection mechanism includes connecting rod and the axle sleeve being fixed on described connecting rod, and described relief portion is arranged on described connecting rod, described axle sleeve set
In described connecting shaft and the two is threaded.
8. fire-preventing check valve as claimed in claim 7, it is characterised in that described axle sleeve includes first annular section and is fixed on institute
Stating the second ring segment on connecting rod, the outline of described first annular section of radial cross-section is circular.
9. fire-preventing check valve as claimed in claim 8, it is characterised in that described first annular section is provided with the first screwed hole,
Described second ring segment is provided with second screwed hole corresponding with described first screwed hole.
10. fire-preventing check valve as claimed in claim 7, it is characterised in that described connecting rod includes the first linkage section and with described
The second linkage section that axle sleeve connects, described first linkage section is connected formation escape groove, described escape groove with described second linkage section
For described relief portion.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620865690.1U CN205877295U (en) | 2016-08-09 | 2016-08-09 | Fire -proof check valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620865690.1U CN205877295U (en) | 2016-08-09 | 2016-08-09 | Fire -proof check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205877295U true CN205877295U (en) | 2017-01-11 |
Family
ID=57703030
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201620865690.1U Active CN205877295U (en) | 2016-08-09 | 2016-08-09 | Fire -proof check valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN205877295U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439118A (en) * | 2016-08-09 | 2017-02-22 | 杭州小米环境科技有限公司 | Fire-prevention check valve |
-
2016
- 2016-08-09 CN CN201620865690.1U patent/CN205877295U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106439118A (en) * | 2016-08-09 | 2017-02-22 | 杭州小米环境科技有限公司 | Fire-prevention check valve |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Lianzhi (Beijing) Technical Service Co., Ltd Assignor: HANGZHOU XIAOMI ENVIRONMENT TECHNOLOGY Co.,Ltd. Contract record no.: X2020990000381 Denomination of utility model: Fire-proof check valve Granted publication date: 20170111 License type: Exclusive License Record date: 20200727 |
|
| EC01 | Cancellation of recordation of patent licensing contract | ||
| EC01 | Cancellation of recordation of patent licensing contract |
Assignee: Lianzhi (Beijing) Technical Service Co., Ltd Assignor: HANGZHOU XIAOMI ENVIRONMENT TECHNOLOGY Co.,Ltd. Contract record no.: X2020990000381 Date of cancellation: 20201113 |
|
| EE01 | Entry into force of recordation of patent licensing contract | ||
| EE01 | Entry into force of recordation of patent licensing contract |
Assignee: Lianzhi (Beijing) Technical Service Co., Ltd Assignor: HANGZHOU XIAOMI ENVIRONMENT TECHNOLOGY Co.,Ltd. Contract record no.: X2020990000595 Denomination of utility model: A fire check valve Granted publication date: 20170111 License type: Exclusive License Record date: 20201113 |