CN111623455A - Ventilation structure for building engineering - Google Patents

Ventilation structure for building engineering Download PDF

Info

Publication number
CN111623455A
CN111623455A CN202010297428.2A CN202010297428A CN111623455A CN 111623455 A CN111623455 A CN 111623455A CN 202010297428 A CN202010297428 A CN 202010297428A CN 111623455 A CN111623455 A CN 111623455A
Authority
CN
China
Prior art keywords
motor
exhaust fan
controller
torsion bar
sensor module
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202010297428.2A
Other languages
Chinese (zh)
Inventor
杨楠
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
South China University of Technology SCUT
Original Assignee
South China University of Technology SCUT
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by South China University of Technology SCUT filed Critical South China University of Technology SCUT
Priority to CN202010297428.2A priority Critical patent/CN111623455A/en
Publication of CN111623455A publication Critical patent/CN111623455A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F7/00Ventilation
    • F24F7/04Ventilation with ducting systems, e.g. by double walls; with natural circulation
    • F24F7/06Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit
    • F24F7/065Ventilation with ducting systems, e.g. by double walls; with natural circulation with forced air circulation, e.g. by fan positioning of a ventilator in or against a conduit fan combined with single duct; mounting arrangements of a fan in a duct
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04DNON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00Details, component parts, or accessories
    • F04D29/66Combating cavitation, whirls, noise, vibration or the like; Balancing
    • F04D29/661Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps
    • F04D29/668Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for elastic fluid pumps damping or preventing mechanical vibrations
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/30Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32Responding to malfunctions or emergencies
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00Control or safety arrangements
    • F24F11/89Arrangement or mounting of control or safety devices
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/10Temperature
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/20Humidity
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/50Air quality properties
    • F24F2110/62Tobacco smoke
    • FMECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24HEATING; RANGES; VENTILATING
    • F24FAIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00Control inputs relating to air properties
    • F24F2110/50Air quality properties
    • F24F2110/65Concentration of specific substances or contaminants

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ventilation (AREA)

Abstract

The invention discloses a ventilation structure for constructional engineering, which comprises an environment sensor module, a ventilation structure and an electronic control box, wherein the wind structure comprises an electric wind mask, an exhaust fan, an exhaust pipe and an exhaust fan bracket, the electric wind mask is connected with the exhaust pipe, the exhaust fan is installed at the outlet position of the tail end of the exhaust pipe, a controller, a motor A and a sliding resistor are integrated in the electronic control box, the environment sensor module is in signal connection with the controller, the controller is electrically connected with the motor A and indirectly controls the mechanical sliding of the sliding resistor, the output of the sliding resistor is respectively connected with the motor B and the motor C, the motor B is in driving connection with the exhaust fan, and the motor C is in driving connection with the electric wind mask; the controller also outputs signals to connect with the acousto-optic alarm module. The intelligent automatic control exhaust fan-based ventilation structure disclosed by the invention automatically works with low power consumption, has good effects of comprehensive ventilation, replacement ventilation and smoke prevention and discharge, and is simple in structure and easy to install.

Description

Ventilation structure for building engineering
Technical Field
The invention relates to the technical field of constructional engineering, in particular to a ventilation structure for constructional engineering.
Background
Usually, a ventilation structure is arranged in a building engineering room, the main functions of the ventilation structure are to provide oxygen required by human breathing, dilute indoor pollutants or odor, remove pollutants generated in an indoor technological process, remove indoor residual heat or residual moisture, provide indoor required air, and the ventilation structure is mainly used for buildings such as families, businesses, hotels, schools and the like and mainly plays roles of comprehensive ventilation, replacement ventilation, smoke prevention and the like. The traditional ventilation structure mostly adopts an air conditioner, and the structure is complex and the power consumption is large; the function is single, and only the air exhaust and air exchange can be manually controlled; the installation and the disassembly are inconvenient; the use effect is not good.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a ventilation structure for constructional engineering, wherein an environment sensor module is designed to collect indoor environment data in real time, and then the ventilation structure mainly based on an exhaust fan is intelligently and automatically controlled to work with low power consumption, so that the effects of comprehensive ventilation, replacement ventilation and smoke prevention are good, and the ventilation structure is simple in structure and easy to install.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme: a ventilation structure for building engineering comprises an environment sensor module, a ventilation structure and an electronic control box, wherein the wind structure comprises an electric wind mask, an exhaust fan, an exhaust pipe and an exhaust fan bracket, the electric wind mask is of a shutter type and is arranged on an indoor wall, and the environment sensor module is provided with the upper part of the electric wind mask; the electric air mask is connected with an exhaust pipe, the exhaust pipe comprises a horizontal pipe section penetrating through a wall and a bent pipe section extending out of the room, and a bent outlet is vertically downward; an exhaust fan is arranged at the outlet of the tail end of the exhaust pipe and is fixed on the outer wall through an exhaust fan bracket; the electronic control box is internally integrated with a controller, a motor A and a sliding resistor, the environment sensor module is in signal connection with the controller, the controller is electrically connected with the motor A and indirectly controls the mechanical sliding of the sliding resistor, and the initial position of the input end of the sliding resistor is the maximum end of the resistor; the output of the sliding resistor is respectively connected with a motor B and a motor C, the motor B is in driving connection with an exhaust fan, and the motor C is in driving connection with an electric air mask; the controller also outputs a signal to be connected with an acousto-optic alarm module, and the acousto-optic alarm module is arranged on an indoor wall; the exhaust fan comprises a damping blade.
Preferably, the central part of the exhaust fan structure is a driving shaft electrically connected with the motor B, the periphery of the driving shaft is sleeved with a housing, a plurality of damping blades are integrally arranged outside the housing in an array manner, a torsion bar stabilizing device is arranged on the bottom wall surface of each damping blade, the torsion bar stabilizing device comprises a side supporting rod, a rotating bushing and a transverse torsion bar spring, the torsion bar spring is made of spring steel, one end of the torsion bar spring is arranged at the tail end of each damping blade, and the other end of the torsion bar spring is connected into the rotating bushing and can rotate in the rotating bushing under pressure; the rotating bushing is fixedly connected with the side supporting rod, and the tail end of the side supporting rod is fixedly connected to the peripheral shell of the driving shaft.
Preferably, an included angle between the side support rod and the transverse torsion bar spring is 100-170 degrees.
Preferably, the sound and light alarm module consists of a buzzer and a light emitting diode.
Preferably, the environment sensor module comprises a combustible gas sensor, a temperature sensor, a humidity sensor and a smoke sensor.
Preferably, the distance between the upper end of the electric tuyere cover and the indoor roof is 25-35 cm.
Preferably, the controller is a single chip microcomputer.
Preferably, a first power supply is arranged in the environment sensor module, and a second power supply is arranged in the electronic control box and electrically connected with the controller.
(III) advantageous effects
The invention provides a ventilation structure for constructional engineering, which has the following beneficial effects:
(1) according to the invention, the environment sensor module is arranged to collect indoor environment data in real time, and then the ventilation structure mainly comprising the exhaust fan is intelligently and automatically controlled by the single-chip microcomputer controller to automatically work with low power consumption (the electric power is saved by adjusting the sliding resistor), so that the effects of comprehensive ventilation, replacement ventilation and smoke prevention are good, and the structure is simple and easy to install.
(2) The invention has the function of early warning and reminding of environmental hazards by arranging the sound and light alarm module.
(3) The spring type damping fan blade structure is arranged, and mechanical loss and even damage of the exhaust fan blade are restrained.
Drawings
FIG. 1 is a schematic view of an external mounting structure of the present invention;
FIG. 2 is a block diagram of the working principle of the present invention;
FIG. 3 is a functional block diagram of an environmental sensor module according to the present invention;
FIG. 4 is a schematic structural diagram of a damping fan according to the present invention;
fig. 5 is a partially enlarged schematic view of a portion a of fig. 4.
In the figure, 1-environmental sensor module, 11-first power supply, 12-combustible gas sensor, 13-temperature sensor, 14-humidity sensor, 15-smoke sensor; 2-an electronic control box, 21-a controller, 22-a motor A, 23-a sliding resistor and 24-a second power supply; 3, a sound and light alarm module; 4-electric wind mask, 41-motor C; 5-exhaust fan support; 6-an exhaust pipe; 7-exhaust fan, 71-motor B, 72-drive shaft, 73-damping blade, 74-side support rod, 75-rotary bush, 76-torsion bar 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:
as shown in fig. 1 to 5, the present invention provides a technical solution: a ventilation structure for building engineering comprises an environment sensor module 1, a ventilation structure and an electronic control box 2, wherein the ventilation structure comprises an electric air mask 4, an exhaust fan 7, an exhaust pipe 6 and an exhaust fan bracket 5, the electric air mask 4 is of a louver type and is arranged on an indoor wall, and the environment sensor module 1 is arranged on the upper part of the electric air mask 4; the electric air mask 4 is connected with an exhaust pipe 6, the exhaust pipe 6 comprises a horizontal pipe section penetrating through the wall and a bent pipe section extending out of the room, and a bent outlet is vertically downward; an exhaust fan 7 is arranged at the outlet position of the tail end of the exhaust pipe 6, and the exhaust fan 7 is fixed on the outer wall through an exhaust fan bracket 5; the electronic control box 2 is internally integrated with a controller 21, a motor A22 and a sliding resistor 23, the environment sensor module 1 is in signal connection with the controller 21, the controller 21 is electrically connected with the motor A22 and indirectly controls the mechanical sliding of the sliding resistor 23, and the initial position of the input end of the sliding resistor 23 is the maximum resistance end; the output of the sliding resistor 23 is respectively connected with a motor B71 and a motor C41, the motor B71 is connected with the exhaust fan 7 in a driving way, and the motor C41 is connected with the electric air mask 4 in a driving way; the controller 21 also outputs a signal to be connected with the sound and light alarm module 3, and the sound and light alarm module 3 is arranged on the indoor wall; the exhaust fan 7 includes a damper blade 73.
The central part of the structure of the exhaust fan 7 is a driving shaft 72 electrically connected with a motor B71, the driving shaft 72 is sleeved with a housing, a plurality of damping blades 73 are integrally arranged outside the housing in an array, a torsion bar stabilizing device is arranged on the bottom wall surface of each damping blade 73, the torsion bar stabilizing device comprises a side supporting rod 74, a rotating bush 75 and a transverse torsion bar spring 76, the torsion bar spring 76 is made of spring steel, one end of the torsion bar spring is arranged at the tail end of each damping blade 73, and the other end of the torsion bar spring is connected into the rotating bush 75 and can rotate in the rotating bush 75 under pressure; the rotating bushing 75 is fixedly connected with the side supporting rod 74, and the tail end of the side supporting rod 74 is fixedly connected with the outer shell of the driving shaft 72. The torsion bar stabilizing device can effectively buffer the vibration force of the blades of the exhaust fan 7 during working and inhibit the loss of the blades.
Wherein, the included angle between the side supporting rod 74 and the transverse torsion bar spring 76 is 160 °.
The sound and light alarm module 3 is composed of a buzzer and a light emitting diode.
The environment sensor module 1 includes, but is not limited to, a combustible gas sensor 12, a temperature sensor 13, a humidity sensor 14, and a smoke sensor 15.
Wherein, the distance between the upper end of the electric air mask 3 and an indoor roof is 35 cm.
Wherein, the controller 21 is a single chip microcomputer.
A first power supply 11 is arranged in the environment sensor module 1, and a second power supply 24 is arranged in the electronic control box 2 and electrically connected with the controller 21.
The working principle is as follows: the invention collects indoor environmental data in real time by arranging the environmental sensor module 1, when environmental dangerous data are detected, the ventilation structure which mainly comprises the exhaust fan 7 (simultaneously the opening of the electric air mask 4 is enlarged) is intelligently and automatically controlled to automatically work based on the sliding resistance through a singlechip controller, when environmental data returns to normal, based on sliding resistance (increase resistance value, reduce line current) intelligent automatic control exhaust fan 7 through single chip microcomputer controller is taken as the dormancy lowering power of ventilation structure dormancy even dormancy (4 opening shrink of electronic wind mask reduce even opening close simultaneously), the effect of comprehensive ventilation, replacement ventilation, prevent to discharge fume is good, simple structure easily installs, play the dangerous early warning of environment through setting up audible and visual alarm module 3 and remind the function, set up spring type shock attenuation fan blade structure, restrain exhaust fan blade mechanical loss even damage.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (8)

1. The utility model provides a ventilation structure for building engineering, includes environmental sensor module (1), ventilation structure and electronic control box (2), its characterized in that: the ventilation structure comprises an electric air mask (4), an exhaust fan (7), an exhaust pipe (6) and an exhaust fan bracket (5), wherein the electric air mask (4) is in a shutter shape and is arranged on an indoor wall, and the environment sensor module (1) is arranged on the upper part of the electric air mask (4); the electric air mask (4) is connected with an exhaust pipe (6), the exhaust pipe (6) comprises a horizontal pipe section penetrating through a wall and a bent pipe section extending out of the room, and a bent outlet is vertically downward; an exhaust fan (7) is arranged at the outlet position of the tail end of the exhaust pipe (6), and the exhaust fan (7) is fixed on the outer wall through an exhaust fan bracket (5);
a controller (21), a motor A (22) and a sliding resistor (23) are integrated in the electronic control box (2), the environmental sensor module (1) is in signal connection with the controller (21), the controller (21) is electrically connected with the motor A (22) and indirectly controls mechanical sliding of the sliding resistor (23), and the initial position of the input end of the sliding resistor (23) is the maximum resistance end; the output of the sliding resistor (23) is respectively connected with a motor B (71) and a motor C (41), the motor B (71) is in driving connection with the exhaust fan (7), and the motor C (41) is in driving connection with the electric air mask (4); the controller (21) also outputs a signal to be connected with the acousto-optic alarm module (3), and the acousto-optic alarm module (3) is arranged on the indoor wall;
the exhaust fan (7) comprises damping blades (73).
2. A ventilating structure for construction engineering according to claim 1, wherein: the central part of the structure of the exhaust fan (7) is provided with a driving shaft (72) electrically connected with a motor B (71), the periphery of the driving shaft (72) is sleeved with a shell, a plurality of damping blades (73) are integrally arranged outside the shell in an array mode, a torsion bar stabilizing device is arranged on the bottom wall surface of each damping blade (73), each torsion bar stabilizing device comprises a side supporting rod (74), a rotating bush (75) and a transverse torsion bar spring (76), each torsion bar spring (76) is made of spring steel, one end of each torsion bar spring is arranged at the tail end of each damping blade (73), and the other end of each torsion bar spring is connected into the rotating bush (75) and can rotate in the rotating bush (75) in a pressed mode; the rotating bushing (75) is fixedly connected with the side supporting rod (74), and the tail end of the side supporting rod (74) is fixedly connected to the outer shell of the driving shaft (72).
3. A ventilating structure for construction engineering according to claim 2, wherein: the included angle between the side supporting rod (74) and the transverse torsion bar spring (76) is 100-170 degrees.
4. A ventilating structure for construction engineering according to claim 1, wherein: the sound and light alarm module (3) is composed of a buzzer and a light emitting diode.
5. A ventilating structure for construction engineering according to claim 1, wherein: the environment sensor module (1) comprises a combustible gas sensor (12), a temperature sensor (13), a humidity sensor (14) and a smoke sensor (15).
6. A ventilating structure for construction engineering according to claim 1, wherein: the distance between the upper end of the electric air mask (3) and the indoor roof is 25-35 cm.
7. A ventilating structure for construction engineering according to claim 1, wherein: the controller (21) is a single chip microcomputer.
8. A ventilating structure for construction engineering according to claim 1, wherein: a first power supply (11) is arranged in the environment sensor module (1), and a second power supply (24) is arranged in the electronic control box (2) and is electrically connected with the controller (21).
CN202010297428.2A 2020-04-16 2020-04-16 Ventilation structure for building engineering Pending CN111623455A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202010297428.2A CN111623455A (en) 2020-04-16 2020-04-16 Ventilation structure for building engineering

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202010297428.2A CN111623455A (en) 2020-04-16 2020-04-16 Ventilation structure for building engineering

Publications (1)

Publication Number Publication Date
CN111623455A true CN111623455A (en) 2020-09-04

Family

ID=72273018

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202010297428.2A Pending CN111623455A (en) 2020-04-16 2020-04-16 Ventilation structure for building engineering

Country Status (1)

Country Link
CN (1) CN111623455A (en)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208031A1 (en) * 1985-07-09 1987-01-14 JAMES HOWDEN & COMPANY LIMITED Fan construction
JP2005308352A (en) * 2004-04-23 2005-11-04 Nayuta:Kk Ventilation fan for natural lighting
CN204851700U (en) * 2015-07-10 2015-12-09 无锡商业职业技术学院 Take industry fan of shock attenuation flabellum
CN205401199U (en) * 2016-03-07 2016-07-27 南振东 Take automation of automatic alarm function to open exhaust fan
CN205844505U (en) * 2016-07-27 2016-12-28 阿里巴巴集团控股有限公司 Load circuit for emulating server
CN108692419A (en) * 2017-04-10 2018-10-23 姜燕 A kind of novel ventilated ventilation curtain wall construction

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0208031A1 (en) * 1985-07-09 1987-01-14 JAMES HOWDEN & COMPANY LIMITED Fan construction
JP2005308352A (en) * 2004-04-23 2005-11-04 Nayuta:Kk Ventilation fan for natural lighting
CN204851700U (en) * 2015-07-10 2015-12-09 无锡商业职业技术学院 Take industry fan of shock attenuation flabellum
CN205401199U (en) * 2016-03-07 2016-07-27 南振东 Take automation of automatic alarm function to open exhaust fan
CN205844505U (en) * 2016-07-27 2016-12-28 阿里巴巴集团控股有限公司 Load circuit for emulating server
CN108692419A (en) * 2017-04-10 2018-10-23 姜燕 A kind of novel ventilated ventilation curtain wall construction

Similar Documents

Publication Publication Date Title
CN209510670U (en) A kind of energy conservation roof ventilator
CN1719360A (en) air cooled type base station power saving system and power saving control method
CN205878408U (en) Full -automatic air condensing units grille -type protection casing
CN102183939A (en) Transformer substation indoor environment safety intelligent control system
CN201129821Y (en) Machinery room environment control energy-saving system
CN211451303U (en) Moisture condensation prevention pipe gallery ventilation system
CN206707541U (en) With Intelligent purifying except the window of haze fresh air and early warning system
CN204189047U (en) Electric power outdoor cabinet temperature control system
CN206522870U (en) A kind of anti-falling from high altitude and the air-conditioner outdoor unit of rain-proof water erosion
CN204693740U (en) Indoor environment comfort tuning system
CN111623455A (en) Ventilation structure for building engineering
CN207813132U (en) A kind of Self-temperature-regulating communication iron tower computer room
CN210052264U (en) Intelligent smoke sensing controller
CN209544952U (en) A kind of environment automatic regulating system of substation control buildings
CN206222536U (en) Air-conditioning with air guide structure
CN206017230U (en) Harmful gass automatic exhaust fan
CN210226546U (en) Intelligent ecological breeding environment-control system for fine-breed meat ducks
CN201074887Y (en) Surroundings intelligent regulation and control device
CN114576813A (en) Power utilization information acquisition system based on electric power cloud platform
CN213063398U (en) Novel air exhaust and supplement device for industrial factory workshop
CN105020800B (en) A kind of window of general installation carries the air purifier and its installation method of formula
CN207895284U (en) A kind of alarm of detection of natural gas and ventilation device
CN211720166U (en) Cable bridge with reminding function
CN208536248U (en) A kind of fire-fighting roofing pressure air blowing unit
CN219572181U (en) Ventilation and dehumidification device for fire pump room

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
RJ01 Rejection of invention patent application after publication

Application publication date: 20200904

RJ01 Rejection of invention patent application after publication