CN113464665A - Smoke exhaust valve with automatic fire detection function and control method - Google Patents
Smoke exhaust valve with automatic fire detection function and control method Download PDFInfo
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- CN113464665A CN113464665A CN202110751355.4A CN202110751355A CN113464665A CN 113464665 A CN113464665 A CN 113464665A CN 202110751355 A CN202110751355 A CN 202110751355A CN 113464665 A CN113464665 A CN 113464665A
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- smoke
- smoke exhaust
- exhaust valve
- control end
- closed
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Classifications
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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
- F16K1/22—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 crossing the valve member, e.g. butterfly valves
- F16K1/223—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 crossing the valve member, e.g. butterfly valves with a plurality 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
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/36—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position
- F16K17/38—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature
- F16K17/386—Safety valves; Equalising valves, e.g. pressure relief valves actuated in consequence of extraneous circumstances, e.g. shock, change of position of excessive temperature the closure members being rotatable or pivoting
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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
- F16K31/00—Actuating devices; Operating means; Releasing devices
- F16K31/44—Mechanical actuating means
- F16K31/60—Handles
Abstract
The invention provides a smoke exhaust valve with a function of automatically detecting fire and a control method, which are independent of a fire alarm system, do not need personnel to reach a fire scene for operation when a fire occurs, and protect the life safety of the personnel. The smoke exhaust valve is provided with a corresponding smoke detector, the smoke exhaust valve is automatically opened through the closing of an internal normally open contact as long as smoke in a corresponding area reaches a warning value, and after the smoke exhaust valve is automatically opened, the internal normally open contact (which can be a microswitch) is closed to start a corresponding smoke exhaust fan in a linkage manner, so that smoke is exhausted from the smoke area. An independent smoke detector is arranged, the smoke detector is installed separately from the smoke exhaust valve, and the ceiling is installed on a ceiling or a smoke gathering area.
Description
Technical Field
The invention belongs to the technical field of fire fighting equipment, and particularly relates to a smoke exhaust valve with a function of automatically detecting fire and a control method.
Background
According to the on-site installation requirement of the standard, the smoke exhaust valve (port) is arranged on a ceiling or a wall surface close to the ceiling, the current standard clearly requires that the smoke exhaust fan should be started in a linkage manner after the smoke exhaust valve is opened, and the process is not influenced by external factors such as an alarm system and the like. When the alarm system fails and the smoke exhaust valve cannot be automatically or manually opened through the alarm controller, the smoke exhaust valve does not have an automatic opening function, and the regulation that the smoke exhaust valve is independent of the regulation of the alarm system linkage starting smoke exhaust fan is similar to a nominal regulation. Even if the smoke damper is equipped with a mechanical opening tab, the manual operation of opening the smoke damper in the field in case of fire is not preferable because the smoke damper must be hidden from the ladder and the location is high in order to put the smoke damper in a life-threatening state.
The technical standard of building smoke prevention and exhaust system GB51251 stipulates that after a fire-fighting exhaust valve (port) is opened, a fire-fighting exhaust fan can be automatically started in a linkage manner, and the process is not influenced by external factors such as a fire-fighting alarm system and the like. But in execution it was found that a serious drawback of the system implementation occurs: the smoke exhaust valve can be influenced by a fire alarm system no matter the smoke exhaust valve is automatically opened or remotely and manually opened, namely, the smoke exhaust valve cannot be opened after the fire alarm system fails, and the fan is started in a linkage mode to form an idle call.
Therefore, there is a need to provide an improved solution to the above-mentioned drawbacks of the prior art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide the smoke exhaust valve which is independent of the existing fire protection system and can instantly start the smoke exhaust fan in a linkage manner.
In order to achieve the above purpose, the invention provides the following technical scheme:
an exhaust valve with automatic fire detection function, the exhaust valve includes:
the smoke exhaust valve has an opening state and a closing state, and forms a smoke exhaust channel in the opening state;
the smoke detector is used for detecting the smoke concentration and is internally provided with a first control end so as to close the first control end when the smoke reaches the preset concentration;
the actuating mechanism is arranged on the smoke exhaust valve, a control circuit is arranged in the actuating mechanism, and the control circuit is electrically connected with the first control end to form a closed loop after the first control end is closed;
after the control circuit forms a closed loop, the actuating mechanism opens the smoke exhaust valve and locks and starts the smoke exhaust fan.
Preferably, the smoke detector is a non-coding smoke detector, and the first control end is a normally open contact of the smoke detector and is closed when smoke reaches a preset concentration.
Preferably, the actuating mechanism is internally provided with a second control end, and the second control end is closed after the smoke exhaust valve is opened;
and the smoke exhaust fan is started by closing the second control end.
Preferably, the second control end is a normally open contact, and a circuit of the smoke exhaust fan forms a closed loop by closing.
Preferably, the smoke exhaust valve with the function of automatically detecting fire comprises at least:
the valve body is a square frame body;
the blades are hinged in the valve body through a driven shaft and enable the smoke exhaust valve to be switched between an opening state and a closing state through rotation;
the driving shaft is connected with the driven shaft through a transmission mechanism so as to drive the driven shaft to rotate;
the actuating mechanism is correspondingly arranged on the outer wall of the valve body and is correspondingly connected with the driving shaft to drive the driving shaft.
Preferably, the actuating mechanism is provided with a manual starting unit for manually sending a driving command to the actuating mechanism.
Preferably, the manual starting unit is a control button, and the control button is electrically connected with the actuating mechanism so as to enable the control circuit to form a closed loop through the control button.
A control method of a smoke exhaust valve with a function of automatically detecting fire comprises the following steps:
step S1, detecting the smoke concentration through a smoke detector, wherein the smoke detector is internally provided with a first control end so as to close the first control end when the smoke reaches a preset concentration;
step S2, electrically connecting an internal control circuit of the actuator to the first control terminal to form a closed loop after the first control terminal is closed;
and step S3, after the control circuit is controlled to form a closed loop, the actuating mechanism opens the smoke exhaust valve and locks and starts the smoke exhaust fan.
Preferably, the smoke detector is a non-coding smoke detector, and the first control end is a normally open contact and is closed when the smoke reaches a preset concentration.
In the above method for controlling a smoke exhaust valve with a function of automatically detecting a fire, preferably, a second control end is provided in the actuator, and the second control end is closed after the smoke exhaust valve is opened;
the smoke exhaust fan is started through the second control end in a closed mode, wherein the second control end is a normally open contact, and a circuit of the smoke exhaust fan forms a closed loop through closing.
Has the advantages that: when the smoke concentration at the detection position reaches the warning value of the smoke detector, a fire disaster is considered to occur, the first control end in the smoke detector is closed, the smoke exhaust valve is opened in a linkage manner, and after the smoke exhaust valve is closed, the second control end in the actuating mechanism is closed, so that a circuit where the smoke exhaust fan is located forms a closed loop to be opened to exhaust smoke; this application is independent of fire alarm system, does not need personnel to reach the scene of fire and operates when the conflagration takes place, protection personnel life safety. The smoke exhaust valve can be automatically opened as long as the smoke in the corresponding area reaches the warning value, the corresponding smoke exhaust fan is started through the automatic opening linkage of the smoke exhaust valve, smoke is exhausted in the smoke area, the principle is simple, the starting accuracy of the smoke exhaust valve is high, the smoke exhaust valve is not interfered by the running state factor of the existing fire protection system, the technical defect of the existing smoke exhaust valve is overcome, and the national standard requirement is met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. Wherein:
FIG. 1 is a schematic view of a smoke exhaust valve according to an embodiment of the present invention.
In the figure, 1, a smoke detector; 2. a valve body; 3. a blade; 4. an actuator; 5. a fire resistant copper core cable; 6. a smoke exhaust fan.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments that can be derived by one of ordinary skill in the art from the embodiments given herein are intended to be within the scope of the present invention.
In the description of the present invention, the terms "longitudinal", "lateral", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are for convenience of description of the present invention only and do not require that the present invention must be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. The terms "connected" and "connected" used herein should be interpreted broadly, and may include, for example, a fixed connection or a detachable connection; they may be directly connected or indirectly connected through intermediate members, and specific meanings of the above terms will be understood by those skilled in the art as appropriate.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings. It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
As shown in fig. 1, an exhaust smoke valve with a function of automatically detecting fire comprises: the smoke exhaust valve is opened and closed, and forms a smoke exhaust channel when being opened, so that smoke can be exhausted through the channel; the smoke exhaust valve is driven by the actuating mechanism 4, so that the opening or closing of the smoke exhaust valve is controlled; the smoke detector 1 is arranged to detect smoke concentration, a first control end is arranged in the smoke detector 1 and is electrically connected with a control circuit in the actuating mechanism 4, and after the first control end is closed, the control circuit forms a closed loop, so that the smoke exhaust valve is opened when smoke is formed; after the control circuit forms a closed loop, the actuating mechanism 4 opens the smoke exhaust valve and locks and starts the smoke exhaust fan 6, and the smoke exhaust fan 6 is right opposite to the smoke exhaust valve so as to exhaust smoke through the smoke exhaust channel when the smoke exhaust valve is in an open state.
In another optional embodiment of the present application, the smoke detector 1 is a non-coding smoke detector 1, the first control terminal is a normally open contact, and the contact is closed when the smoke reaches a preset concentration. When the smoke detector 1 monitors that the smoke concentration is greater than the preset value, the first control end inside the smoke detector is closed, and the actuating mechanism 4 forms a closed loop through the closing of the first control end, so that the smoke detector is started and drives the smoke exhaust valve to be opened.
In this embodiment, the actuator 4 is provided with a second control end, and is closed after the smoke exhaust valve is opened; the circuit of the smoke exhaust fan 6 is closed through a second control end to form a closed loop. Thereby starting the smoke exhaust fan 6 to exhaust the smoke.
Optionally, the second control end is a normally open contact or a micro switch, the state of the smoke exhaust valve is monitored, and after the smoke exhaust valve is opened, the second control end is closed to enable a circuit of the smoke exhaust fan 6 to form a closed loop.
In another optional embodiment of the application, the smoke exhaust valve at least comprises a valve body 2, blades 3 and a driving shaft, wherein the valve body 2 is a square frame body and is arranged on a ceiling or a wall surface close to the ceiling through an installation window, the smoke detector 1 is arranged in a place where smoke is easy to accumulate indoors, the blades 3 are hinged in the valve body 2 through a driven shaft, and the smoke exhaust valve is switched between an open state and a closed state through rotation; the driving shaft is connected with the driven shaft through a transmission mechanism so as to drive the driven shaft to rotate; the actuating mechanism 4 is correspondingly arranged on the outer wall of the valve body 2 and is correspondingly connected with the driving shaft to drive the driving shaft. Wherein, drive mechanism can be for driving chain, drive gear etc. and actuating mechanism 4 corresponds and sets up in 2 outer walls of valve body, and actuating mechanism 4 corresponds and connects the driving shaft, and the rotation of drive driving shaft realizes the control to blade 3, and every smoke damper all corresponds and is equipped with a smoke exhaust fan 6.
In some embodiments, taking the second control end as a micro switch as an example, the driving shaft is provided with a protrusion, the micro switch is correspondingly arranged at the deflector rod, and after the driving shaft rotates to generate an opening action, the micro switch is closed, so as to open the smoke exhaust fan 6.
In another optional embodiment of the present application, the system is independent of the fire protection system, the smoke exhaust fan 6 can not only be automatically started by alarming, remotely and manually started by a multi-line control panel of a fire alarm controller, and manually started on site by a fan control cabinet of a fan room, but also can be started in a linkage manner after any smoke exhaust valve is opened, and the fire alarm controller does not influence any smoke exhaust port to start the smoke exhaust fan 6 in a linkage manner no matter whether the fire alarm controller is in manual or automatic operation or failure or shutdown.
The smoke detector 1 is connected with the corresponding connection actuating mechanism 4 through a fire-resistant copper core cable 5; the actuator 4 is a smoke exhaust fan 6 through a fire resistant copper core cable 5. The fire-resistant copper core cable 5 has high temperature resistance, and the specific length thereof depends on the specific installation position.
In another alternative embodiment of the present application, the actuator 4 is provided with a manual actuation unit for manually sending a driving command to the actuator 4. The manual starting unit is a control button which is electrically connected with the actuating mechanism 4 so as to form a closed loop for the control circuit through the control button. The control button can be arranged on a key control room and an indoor wall, the electrical property of the control button and the control circuit in the execution mechanism 4 form an independent loop, and the smoke exhaust valve is directly started through the control button. Even mechanical opening pull ring is installed to current smoke damper's actuating mechanism 4, but because smoke damper mounting height must be with the help of hiding with ladder and position, it is inadvisable to come the manual opening of life danger under the conflagration condition, even dangerous and lucky open a smoke damper, smoke exhaust fan 6 can chain start, other smoke dampers are not opened and still can not effectually be discharged fume, consequently this system predetermines the control button who corresponds every smoke damper, can start the smoke damper as required, need not to start mechanical pull ring after the condition of a fire takes place, personnel safety is improved.
In another optional embodiment of the present application, the smoke detector 1 corresponding to the same smoke exhaust valve may be multiple, and multiple smoke detectors 1 are correspondingly distributed in a place where smoke is prone to gather indoors, so as to increase the comprehensiveness of indoor monitoring.
The smoke detection device is connected with the smoke exhaust valve through a fireproof copper core cable 5, and the length of the cable can be adjusted according to the position of the installation position away from the smoke exhaust valve.
The invention also provides a control method of the smoke exhaust valve with the function of automatically detecting the fire, which comprises the following steps:
step S1, detecting the smoke concentration through the smoke detector 1, wherein the smoke detector 1 is internally provided with a first control end so as to close the first control end when the smoke reaches the preset concentration.
In step S2, the control circuit inside the actuator 4 is electrically connected to the first control end to form a closed loop after the first control end is closed.
And step S3, after the control circuit forms a closed loop, the actuating mechanism 4 opens the smoke exhaust valve and locks and starts the smoke exhaust fan 6.
In step S4, the smoke exhaust fan 6 faces the smoke exhaust valve to exhaust the smoke through the smoke exhaust passage.
In this embodiment, the smoke detector 1 is a non-coding smoke detector 1, the first control end is a normally open contact, and the contact is closed when the smoke reaches a preset concentration.
A second control end is arranged in the actuating mechanism 4 and is closed after the smoke exhaust valve is opened; the smoke exhaust fan 6 is started by closing the second control end.
In conclusion, the fire alarm system is independent of a fire alarm system, and people do not need to reach a fire scene for operation when a fire disaster happens, so that the life safety of the people is protected. The smoke exhaust valve is provided with a corresponding smoke detector 1, as long as smoke in a corresponding area reaches a warning value, the smoke exhaust valve is automatically opened through closing of an internal normally open contact, and after the smoke exhaust valve is automatically opened, the internal normally open contact (which can be a microswitch) is closed to start a corresponding smoke exhaust fan 6 in a linkage manner, so that smoke is exhausted from the smoke area. An independent smoke detector 1 is arranged, the smoke detector 1 is installed in a mode of being separated from a smoke exhaust valve, and a ceiling is installed on a ceiling or a smoke gathering area. It should be understood that the above description is only exemplary, and the embodiments of the present application do not limit the present invention.
The above description is only exemplary of the invention and should not be taken as limiting the invention, as any modification, equivalent replacement, or improvement made within the spirit and principle of the invention is intended to be covered by the appended claims.
Claims (10)
1. The utility model provides a smoke damper that possesses automatic detection condition of a fire function which characterized in that, smoke damper includes:
the smoke exhaust valve has an opening state and a closing state, and forms a smoke exhaust channel in the opening state;
the smoke detector is used for detecting the smoke concentration and is internally provided with a first control end so as to close the first control end when the smoke reaches the preset concentration;
the actuating mechanism is arranged on the smoke exhaust valve, a control circuit is arranged in the actuating mechanism, and the control circuit is electrically connected with the first control end to form a closed loop after the first control end is closed;
after the control circuit forms a closed loop, the actuating mechanism opens the smoke exhaust valve and locks and starts the smoke exhaust fan.
2. The smoke exhaust valve with the function of automatically detecting fire according to claim 1, wherein the smoke detector is a non-coding smoke detector, and the first control end is a normally open contact of the smoke detector and is closed when smoke reaches a preset concentration.
3. The smoke exhaust valve with the function of automatically detecting fire according to claim 1, wherein a second control end is arranged in the actuating mechanism and is closed after the smoke exhaust valve is opened;
and the smoke exhaust fan is started by closing the second control end.
4. The smoke exhaust valve with the function of automatically detecting fire according to claim 3, wherein the second control end is a normally open contact, and a circuit of the smoke exhaust fan forms a closed loop by closing.
5. The smoke exhaust valve with the function of automatically detecting fire according to claim 1, wherein said smoke exhaust valve comprises at least:
the valve body is a square frame body;
the blades are hinged in the valve body through a driven shaft and enable the smoke exhaust valve to be switched between an opening state and a closing state through rotation;
the driving shaft is connected with the driven shaft through a transmission mechanism so as to drive the driven shaft to rotate;
the actuating mechanism is correspondingly arranged on the outer wall of the valve body and is correspondingly connected with the driving shaft to drive the driving shaft.
6. The smoke exhaust valve with the function of automatically detecting fire according to claim 5, wherein the actuator is provided with a manual starting unit for manually sending a driving command to the actuator.
7. The smoke exhaust valve with the function of automatically detecting fire according to claim 6, wherein the manual starting unit is a control button, and the control button is electrically connected with the actuating mechanism so as to enable the control circuit to form a closed loop through the control button.
8. A method for controlling a smoke evacuation valve having a function of automatically detecting a fire, comprising:
step S1, detecting the smoke concentration through a smoke detector, wherein the smoke detector is internally provided with a first control end so as to close the first control end when the smoke reaches a preset concentration;
step S2, electrically connecting an internal control circuit of the actuator to the first control terminal to form a closed loop after the first control terminal is closed;
and step S3, after the control circuit is controlled to form a closed loop, the actuating mechanism opens the smoke exhaust valve and locks and starts the smoke exhaust fan.
9. The method for controlling the smoke exhaust valve with the function of automatically detecting the fire according to claim 8, wherein the smoke detector is a non-coding smoke detector, and the first control end is a normally open contact and is closed when the smoke reaches a preset concentration.
10. The method for controlling the smoke exhaust valve with the function of automatically detecting the fire according to claim 9, wherein a second control end is arranged in the actuating mechanism and is closed after the smoke exhaust valve is opened;
the smoke exhaust fan is started through the second control end in a closed mode, wherein the second control end is a normally open contact, and a circuit of the smoke exhaust fan forms a closed loop through closing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110751355.4A CN113464665A (en) | 2021-07-02 | 2021-07-02 | Smoke exhaust valve with automatic fire detection function and control method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110751355.4A CN113464665A (en) | 2021-07-02 | 2021-07-02 | Smoke exhaust valve with automatic fire detection function and control method |
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| Publication Number | Publication Date |
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| CN113464665A true CN113464665A (en) | 2021-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202110751355.4A Pending CN113464665A (en) | 2021-07-02 | 2021-07-02 | Smoke exhaust valve with automatic fire detection function and control method |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4487214A (en) * | 1981-09-18 | 1984-12-11 | Tatum James R | Damper blade actuating mechanism |
| CN103452884A (en) * | 2013-08-26 | 2013-12-18 | 上虞通风机有限公司 | Roof ventilation machine with automatic smoke exhaust function and automatic air valve size regulation function |
| CN210113425U (en) * | 2019-04-30 | 2020-02-25 | 天津祥顺科技发展有限公司 | Exhaust pipe fire prevention valve with smog detection device |
| CN112283840A (en) * | 2020-04-21 | 2021-01-29 | 陕西理工大学 | Based on environment-friendly fume extractor is used in building fire control |
| CN212509571U (en) * | 2020-07-02 | 2021-02-09 | 杭州诺鸿通风设备有限公司 | Multi-blade fire-fighting smoke exhaust valve |
-
2021
- 2021-07-02 CN CN202110751355.4A patent/CN113464665A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4487214A (en) * | 1981-09-18 | 1984-12-11 | Tatum James R | Damper blade actuating mechanism |
| CN103452884A (en) * | 2013-08-26 | 2013-12-18 | 上虞通风机有限公司 | Roof ventilation machine with automatic smoke exhaust function and automatic air valve size regulation function |
| CN210113425U (en) * | 2019-04-30 | 2020-02-25 | 天津祥顺科技发展有限公司 | Exhaust pipe fire prevention valve with smog detection device |
| CN112283840A (en) * | 2020-04-21 | 2021-01-29 | 陕西理工大学 | Based on environment-friendly fume extractor is used in building fire control |
| CN212509571U (en) * | 2020-07-02 | 2021-02-09 | 杭州诺鸿通风设备有限公司 | Multi-blade fire-fighting smoke exhaust valve |
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