CN115479132A - Fireproof check valve for public flue - Google Patents
Fireproof check valve for public flue Download PDFInfo
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- CN115479132A CN115479132A CN202211190394.2A CN202211190394A CN115479132A CN 115479132 A CN115479132 A CN 115479132A CN 202211190394 A CN202211190394 A CN 202211190394A CN 115479132 A CN115479132 A CN 115479132A
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- locking
- valve
- preposed
- torsion spring
- locking mechanism
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
- F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
- F16K1/20—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation arranged externally of valve member
- F16K1/2042—Special features or arrangements of the sealing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/50—Preventing rotation of valve members
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/003—Safety valves; Equalising valves, e.g. pressure relief valves reacting to pressure and temperature
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J13/00—Fittings for chimneys or flues
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
Abstract
The invention relates to the technical field of fireproof check valves, and particularly discloses a fireproof check valve for a public flue, which comprises a valve casing, a valve port and a flue clamping torsion spring, wherein an air inlet end of the valve port is provided with a front-arranged locking mechanism, the front-arranged locking mechanism is connected with the valve port, and the front-arranged locking mechanism is used for controlling the opening and the closing of the valve port and the valve port; the preposed locking mechanism comprises a preposed temperature sensing element and a locking piece, and when the preposed temperature sensing element works, the locking piece locks the valve cover and the valve port; the front locking mechanism further comprises a locking curved rod, and the locking curved rod is used for limiting the locking piece when the locking piece is located at a locking position. When the front locking torsion spring loses elasticity at continuous high temperature, the locking piece can still clamp the connecting rod under the fixation of the locking curved rod; therefore, under the continuous high-temperature state, the sealing performance of the valve cover and the valve port can be ensured, and the safety effect of the fireproof check valve is improved.
Description
Technical Field
The invention relates to the technical field of fireproof check valves, in particular to a fireproof check valve for a public flue.
Background
The flue check valve is an automatic valve which is automatically opened and closed by the force generated by the flow of the medium in the pipeline; in a kitchen using a longitudinal public flue, in order to prevent high-temperature flue gas in the room from being discharged into the public flue and entering other floors or the high-temperature flue gas in the public flue from flowing back into the kitchen under the condition of fire, a fireproof check valve for preventing the flue gas from flowing back is arranged between an air outlet pipe orifice of a smoke exhaust ventilator and the public flue.
The fireproof check valve mainly comprises a valve body, a valve cover and a locking mechanism; locking mechanism has and arranges air intake or two kinds of forms of air outlet in, and when the condition of a fire appeared, locking mechanism closed the valve gap and locked, and then played the effect that separates the cigarette back-fire relief.
The existing fireproof check valve mainly utilizes the elastic force of a spring to lock the valve plate, and the mode can effectively prevent and control the spread of high-temperature harmful gas at the initial stage of high temperature, but the spring is easy to lose efficacy at high temperature under the influence of continuous high temperature, so that the valve cover is opened, and the spread of the high-temperature harmful gas is caused.
Disclosure of Invention
The invention aims to provide a fireproof check valve for a public flue, which solves the following technical problems:
how to ensure the sealing performance of the fireproof check valve under continuous high temperature.
The purpose of the invention can be realized by the following technical scheme:
a fireproof check valve for a public flue comprises a valve casing, a valve port and a flue clamping torsion spring, wherein an air inlet end of the valve port is provided with a front locking mechanism, the front locking mechanism is connected with the valve port, and the front locking mechanism is used for controlling the opening and the closing of the valve port and the valve port;
the preposed locking mechanism comprises a preposed temperature sensing element and a locking piece, and when the preposed temperature sensing element works, the locking piece locks the valve cover and the valve port;
the front locking mechanism further comprises a locking curved rod, and the locking curved rod is used for limiting the locking piece when the locking piece is located at the locking position.
Preferably, the front locking mechanism comprises a front base, the front base is mounted on the inner wall of the valve port, a connecting rod is rotatably connected to the front base, one end of the connecting rod, which is far away from the front base, is connected with the valve cover, and the connecting rod is subjected to elastic acting force towards the valve cover along the circumferential direction;
the preposed base is provided with a preposed temperature sensing element and a locking piece, and when the preposed temperature sensing element works, the locking piece limits the rotation of the connecting rod;
the locking curved bar is rotatably arranged on the connecting rod, and the locking curved bar is used for limiting the locking piece in a single direction.
Preferably, the locking piece is rotatably installed on the front base, and a front locking torsion spring is arranged between the locking piece and the front base;
the preposed temperature sensing element comprises a first fuse link and a second fuse link; the first fuse link is fixed on the preposed base, and the second fuse link is connected with the first fuse link and is separated when reaching a set temperature range;
when the second fuse link is separated from the first fuse link, the locking piece limits the position of the connecting rod under the action of the front locking torsion spring.
Preferably, a rear locking mechanism is further arranged on the valve casing and is positioned on one side, far away from the front locking mechanism, of the valve cover;
when the rear locking mechanism works, the valve cover is locked with the valve port.
Preferably, the rear locking mechanism comprises a rear base, and the rear base is mounted on the valve shell;
the rear-mounted base is provided with a rear-mounted locking torsion spring and a rear-mounted temperature sensing element, and when the rear-mounted temperature sensing element works, the rear-mounted locking torsion spring acts on the valve cover and enables the valve cover to receive elastic acting force close to the valve port.
Preferably, the connecting rod is of a two-piece rod structure.
Preferably, the locking piece is rotatably connected with the front base, and an opening and closing torsion spring is arranged between the locking piece and the front base;
the front base is evenly provided with a limiting groove, and the limiting groove is used for fixing one end of an opening and closing torsion spring.
Preferably, the connecting rod is rotatably connected with the valve cover.
Preferably, the valve cover is provided with a one-way clamping piece at the action position of the rear locking torsion spring, and the one-way clamping piece is used for fixing the action end of the rear locking torsion spring.
Preferably, the one-way chucking spare is the U type, one-way chucking spare top both sides are provided with the fixture block, the fixture block with rearmounted locking torsional spring looks joint.
The invention has the beneficial effects that:
(1) When the front locking torsion spring loses elasticity at continuous high temperature, the locking piece can still clamp the connecting rod under the fixation of the locking curved rod; therefore, under the continuous high-temperature state, the sealing performance of the valve cover and the valve port can be ensured, and the safety effect of the fireproof check valve is improved.
(2) The rear locking mechanism is simple in structure, only depends on the rotation of the rear locking torsion spring, and cannot lose efficacy under the influence of long-time oil stains; simultaneously through leading locking mechanical system and rearmounted locking mechanical system's cooperation, can respond to the condition of a fire, close the valve gap by the efficient more for the check valve plays the effect that separates the cigarette back-fire relief.
(3) According to the invention, through the action of the limiting groove, the fixed position of one end of the opening and closing torsion spring can be adjusted according to requirements, so that the adjustment of the torsion force of the opening and closing torsion spring is realized, and the applicability of the fireproof check valve in different environments is improved.
(4) According to the valve cover, due to the arrangement of the one-way clamping piece, when the temperature in the pipeline is continuously overhigh, the rear locking spring loses elasticity, the one-way clamping piece still can play a role in fixing the rear locking spring to a certain extent, and otherwise, the sealing performance of the valve cover and the valve port is ensured.
Drawings
The invention is further described below with reference to the accompanying drawings.
FIG. 1 is a schematic view of the fire check valve of the present invention in an open position;
FIG. 2 is a schematic view of the closed state of the fireproof check valve of the present invention;
FIG. 3 is an exploded view of the overall structure of the fire check valve of the present invention;
FIG. 4 is a schematic view of the closed state of the fire check valve of the present invention from another perspective;
FIG. 5 is a schematic structural view of the front locking mechanism of the present invention;
FIG. 6 is a schematic view of the internal structure of the front locking mechanism of the present invention;
FIG. 7 is an exploded view of the front locking mechanism of the present invention;
FIG. 8 is a schematic structural view of the rear locking mechanism of the present invention in a non-operating state;
FIG. 9 is a schematic structural view of the rear locking mechanism of the present invention in an operating state;
fig. 10 is a schematic view of the construction of the one-way clutch of the present invention.
Reference numerals: 1. a valve port; 2. a valve housing; 3. a valve cover; 4. a front locking mechanism; 41. a front temperature sensing element; 411. a first fuse link; 412. a second fuse link; 42. a locking member; 43. a connecting rod; 44. a front-mounted base; 45. a locking curved bar; 46. a front locking torsion spring; 47. opening and closing the torsion spring; 48. a limiting groove; 5. a rear locking mechanism; 51. a rear base; 52. a locking torsion spring is arranged at the rear; 53. a rear temperature sensing element; 531. a third fuse link; 532. a fourth fuse link; 54. a one-way retainer; 541. a clamping block; 6. the flue tightly clamps the torsion spring.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The first embodiment is as follows:
referring to fig. 1-4, the present embodiment provides a fire-proof check valve for a public flue, which includes a valve housing 2, a valve port 1, and a flue clamping torsion spring 6, wherein the flue clamping torsion spring 6 is used to fix the position of the valve housing 2, the valve port 1 is capable of ventilating, a front locking mechanism 4 is disposed at an air inlet end of the valve port 1, and a valve cover 3 is connected to the front locking mechanism 4.
Referring to fig. 1-7, the front locking mechanism 4 includes a front base 44, the front base 44 is mounted on the inner wall of the valve port 1, the front base 44 is rotatably connected with the connecting rod 43, and the connecting rod 43 is subjected to a circumferential elastic force by a front locking torsion spring 46; the connecting rod 43 is connected with the valve cover 3, so that the valve cover 3 can adjust the opening and closing size of the valve cover 3 and the valve port 1 according to the size of the intake air.
Referring to fig. 1-7, the front locking mechanism 4 further includes a front temperature sensing element 41 and a locking member 42, the locking member 42 is rotatably mounted on the front base 44 and connected to the front locking torsion spring 46, the front temperature sensing element 41 is composed of a first fuse link 411 and a second fuse link 412, wherein the first fuse link 411 is fixed on the front base 44, and the second fuse link 412 is connected to the first fuse link 411 through a fusing connection method commonly used in the prior art, so that the second fuse link 412 and the first fuse link 411 are separated from each other in a high temperature state; meanwhile, the second fuse link 412 limits one end of the front locking torsion spring 46, and the front locking torsion spring 46 is connected with the locking member 42, so that after the second fuse link 412 is fused, the front locking torsion spring 46 can enable the locking member 42 to rotate to the locking position under the action of elastic force, and the limiting effect on the connecting rod 43 is achieved.
A locking curved rod 45 is rotatably arranged on the connecting rod 43, the locking curved rod 45 can be knocked off by the locking piece 42 in the rotation process, and after the locking piece 42 clamps the lower end of the connecting rod, the locking curved rod 45 is positioned and returns to the original position under the action of self gravity to fix the locking piece 42, so that the one-way limiting effect is realized; when the front locking torsion spring 46 loses elasticity under continuous high temperature, the locking piece 42 can still clamp the connecting rod under the fixation of the locking curved rod 45; therefore, this embodiment can guarantee the closure of valve gap 3 and valve port 1 under lasting high temperature state through the specific structural setting of leading locking mechanical system 4, has improved the security effect of fire prevention check valve.
The second embodiment:
referring to fig. 1-4 and 8-9, in this embodiment, a rear locking mechanism 5 is further disposed on the valve housing 2, and the rear locking mechanism 5 is disposed at an end of the valve cover 3 away from the front locking mechanism 4, wherein the front locking mechanism 4 is located at an air inlet end of the fire-proof check valve, and the rear locking mechanism 5 is located at an air outlet end of the fire-proof check valve.
When a fire breaks out indoors, the front locking mechanism 4 is arranged at the air inlet end, so that the front temperature sensing element 41 senses the temperature more accurately and can sense and break away more efficiently and quickly, and the connecting rod 43 is locked to close the valve cover 3.
Referring to fig. 8-9, the rear locking mechanism 5 includes a rear base 51, the rear base 51 being mounted on the valve housing 2; the rear base 51 is provided with a rear locking torsion spring 52 and a rear temperature sensing element 53, the rear temperature sensing element 53 comprises a third fuse link 531 and a fourth fuse link 532, therefore, when the rear temperature sensing element 53 works, the fourth fuse link 532 is separated from the third fuse link 531, the rear locking torsion spring 52 acts on the valve cover 3, and the valve cover 3 is sealed with the valve port 1 by the elastic acting force close to the valve port 1.
Because the oil smoke is big in the public flue, in the long-time use, can adhere to the greasy dirt on the locking mechanism for locking mechanism mechanical part can not effectual action, rearmounted locking mechanism 5 simple structure in this embodiment only relies on rearmounted locking torsional spring 52 gyration action, also can not become invalid under the influence of long-time greasy dirt.
Simultaneously, leading locking mechanical system 4 and the cooperation of rearmounted locking mechanical system 5, response condition of a fire, the closing valve gap of ability efficient more for the check valve plays the effect that separates the cigarette back-fire relief.
Example three:
referring to fig. 5-7, the connecting rod 43 of the present embodiment has a two-piece rod structure, so that 3. During the rotation of the connecting rod 43, the problem of the left and right swinging of the single rod during the back and forth movement is effectively solved, and the back and forth reciprocating movement is more stable.
Example four:
referring to fig. 5-7, in the embodiment, the front base 44 is uniformly provided with limiting grooves 48, an opening and closing torsion spring 47 is disposed between the locking member 42 and the front base 44, and the limiting grooves 48 can fix one end of the opening and closing torsion spring 47, so that the position where one end of the opening and closing torsion spring 47 is fixed can be adjusted according to requirements through the action of the limiting grooves 48, the adjustment of the torsion strength of the opening and closing torsion spring 47 is realized, and the applicability of the fire check valve in different environments is improved.
Example five:
referring to fig. 3-4, the connecting rod 43 of the present embodiment is rotatably connected to the valve cap 3, so that the valve cap 3 has better flexibility during operation, and the sealing performance between the valve cap 3 and the valve port 1 can be ensured during long-term use.
Example six:
referring to fig. 3 and 10, in the present embodiment, the valve cap 3 is provided with a one-way fastening member 54 at an acting position of the rear locking torsion spring 52, the one-way fastening member 54 is U-shaped, and two sides of the top of the one-way fastening member 54 are provided with a fastening block 541, so that when the rear temperature sensing element 53 works, the rear locking torsion spring 52 acts on the one-way fastening member 54, the fastening block 541 is fastened with the rear locking torsion spring 52, and further, the effect of fixing the acting end of the rear locking torsion spring 52 is achieved, therefore, through the arrangement of the one-way fastening member 54, when the temperature inside the pipe is continuously too high, the rear locking spring 52 loses elasticity, and the one-way fastening member 54 can still fix the rear locking torsion spring 52 to a certain extent, otherwise, the sealing performance of the valve cap 3 and the valve port 1 is ensured; in addition, through the arrangement of the front locking mechanism 4 and the rear locking mechanism 5, the dual-purpose structure can effectively avoid the problem that the high-temperature toxic gas spreads due to the failure of the fireproof check valve caused by high temperature.
The working principle of the invention is as follows: according to the invention, the locking curved rod 45 is rotatably arranged on the connecting rod 43, the locking curved rod 45 can be knocked off by the locking piece 42 in the rotation process, and after the locking piece 42 clamps the lower end of the connecting rod, the locking curved rod 45 is positioned and returns to the original position under the action of self gravity to fix the locking piece 42, so that the one-way limiting effect is realized; if the front locking torsion spring 46 loses elasticity under continuous high temperature, the locking piece 42 can still clamp the connecting rod under the fixation of the locking curved rod 45; therefore, the sealing performance of the valve cover 3 and the valve port 1 can be ensured under the continuous high-temperature state, and the safety effect of the fireproof check valve is improved.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (10)
1. A fireproof check valve for a public flue comprises a valve casing (2), a valve port (1) and a flue clamping torsion spring (6), and is characterized in that an air inlet end of the valve port (1) is provided with a front locking mechanism (4), the front locking mechanism (4) is connected with a valve cover (3), and the front locking mechanism (4) is used for controlling the opening and closing of the valve cover (3) and the valve port (1);
the preposed locking mechanism (4) comprises a preposed temperature sensing element (41) and a locking piece (42), and when the preposed temperature sensing element (41) works, the locking piece (42) locks the valve cover (3) and the valve port (1);
the front locking mechanism (4) further comprises a locking curved rod (45), and the locking curved rod (45) is used for limiting the locking piece (42) when the locking piece (42) is located at the locking position.
2. The fire-proof check valve for the public flue according to claim 1, characterized in that the preposed locking mechanism (4) comprises a preposed base (44), the preposed base (44) is installed on the inner wall of the valve port (1), a connecting rod (43) is rotatably connected to the preposed base (44), one end of the connecting rod (43) far away from the preposed base (44) is connected with the valve cover (3), and the connecting rod (43) is subjected to elastic force towards the valve cover (3) along the circumferential direction;
the preposed base (44) is provided with a preposed temperature sensing element (41) and a locking piece (42), and when the preposed temperature sensing element (41) works, the locking piece (42) limits the rotation of a connecting rod (43);
the locking curved rod (45) is rotatably installed on the connecting rod (43), and the locking curved rod (45) is used for limiting the locking piece (42) in a one-way mode.
3. The fire-resistant check valve for the public flue according to claim 2, wherein the locking member (42) is rotatably mounted on the front base (44), and a front locking torsion spring (46) is arranged between the locking member (42) and the front base (44);
the preposed temperature sensing element (41) comprises a first fuse link (411) and a second fuse link (412); the first fuse link (411) is fixed on the preposed base (44), and the second fuse link (412) is connected with the first fuse link (411) and is separated when reaching a set temperature range;
when the second fuse link (412) is separated from the first fuse link (411), the locking piece (42) limits the position of the connecting rod (43) under the action of the front locking torsion spring (46).
4. A fire-proof check valve for public flues according to claim 1, characterized in that a rear locking mechanism (5) is further arranged on the valve casing (2), and the rear locking mechanism (5) is positioned on the side of the valve cover (3) far away from the front locking mechanism (4);
when the rear locking mechanism (5) works, the valve cover (3) is locked with the valve port (1).
5. A fire check valve for public flues according to claim 4, characterized in that the rear locking mechanism (5) comprises a rear base (51), the rear base (51) being mounted on the valve housing (2);
the valve is characterized in that the rear base (51) is provided with a rear locking torsion spring (52) and a rear temperature sensing element (53), and when the rear temperature sensing element (53) works, the rear locking torsion spring (52) acts on the valve cover (3) and enables the valve cover (3) to be subjected to elastic acting force close to the valve port (1).
6. A fire protection check valve for a public flue according to claim 2, wherein the connecting rod (43) has a two-piece rod structure.
7. The fire-proof check valve for the public flue according to claim 3, wherein the locking piece (42) is rotatably connected with the front base (44), and an opening and closing torsion spring (47) is arranged between the locking piece (42) and the front base (44);
the front base (44) is uniformly provided with a limiting groove (48), and the limiting groove (48) is used for fixing one end of an open-close torsion spring (47).
8. A fire protection check valve for a public flue according to claim 2, characterized in that the connecting rod (43) is rotatably connected to the valve cover (3).
9. Fire-resistant check valve for public flues according to claim 5, characterized in that the valve cover (3) is provided with a one-way clamping member (54) at the acting position of the rear locking torsion spring (52), and the one-way clamping member (54) is used for fixing the acting end of the rear locking torsion spring (52).
10. The fire-proof check valve for the common flue according to claim 9, wherein the one-way clamping piece (54) is U-shaped, clamping blocks (541) are arranged on two sides of the top of the one-way clamping piece (54), and the clamping blocks (541) are clamped with the rear locking torsion spring (52).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211190394.2A CN115479132B (en) | 2022-09-28 | 2022-09-28 | Fireproof check valve for public flue |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211190394.2A CN115479132B (en) | 2022-09-28 | 2022-09-28 | Fireproof check valve for public flue |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115479132A true CN115479132A (en) | 2022-12-16 |
| CN115479132B CN115479132B (en) | 2023-04-07 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211190394.2A Active CN115479132B (en) | 2022-09-28 | 2022-09-28 | Fireproof check valve for public flue |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115479132B (en) |
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- 2022-09-28 CN CN202211190394.2A patent/CN115479132B/en active Active
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| CN110440036A (en) * | 2019-07-19 | 2019-11-12 | 广州市法玉环保科技有限公司 | A kind of fire-preventing check valve |
| CN112443701A (en) * | 2019-08-30 | 2021-03-05 | 杭州小米环境科技有限公司 | Locking structure and fire prevention check valve |
| CN112443684A (en) * | 2019-09-03 | 2021-03-05 | 山东中科恒基建材有限公司 | Actuating mechanism for non-return fire-proof valve |
| CN112443683A (en) * | 2019-09-03 | 2021-03-05 | 山东中科恒基建材有限公司 | Check fire-proof valve actuating mechanism |
| CN210687151U (en) * | 2019-10-31 | 2020-06-05 | 陈开兵 | Oil smoke discharging fireproof check valve with front and back double control |
| CN213332592U (en) * | 2020-08-06 | 2021-06-01 | 杭州西蒙电器有限公司 | Fireproof locking mechanism |
| CN216715337U (en) * | 2021-10-11 | 2022-06-10 | 江苏通月空调有限公司 | Flue fire prevention valve with temperature sensing structure |
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| CN115479132B (en) | 2023-04-07 |
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