CN111005881B - Fire-fighting smoke exhaust fan - Google Patents

Fire-fighting smoke exhaust fan Download PDF

Info

Publication number
CN111005881B
CN111005881B CN201911258488.7A CN201911258488A CN111005881B CN 111005881 B CN111005881 B CN 111005881B CN 201911258488 A CN201911258488 A CN 201911258488A CN 111005881 B CN111005881 B CN 111005881B
Authority
CN
China
Prior art keywords
motor
heat insulation
hub
smoke exhaust
exhaust fan
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.)
Active
Application number
CN201911258488.7A
Other languages
Chinese (zh)
Other versions
CN111005881A (en
Inventor
何华伟
董明伟
丁润东
丁海霞
丁江伟
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.)
Zhejiang Shuangyang Fan Co ltd
Original Assignee
Zhejiang Shuangyang Fan Co ltd
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 Zhejiang Shuangyang Fan Co ltd filed Critical Zhejiang Shuangyang Fan Co ltd
Priority to CN201911258488.7A priority Critical patent/CN111005881B/en
Publication of CN111005881A publication Critical patent/CN111005881A/en
Application granted granted Critical
Publication of CN111005881B publication Critical patent/CN111005881B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D25/00—Pumping installations or systems
    • F04D25/02—Units comprising pumps and their driving means
    • F04D25/06—Units comprising pumps and their driving means the pump being electrically driven
    • F04D25/0606—Units comprising pumps and their driving means the pump being electrically driven the electric motor being specially adapted for integration in the pump
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/32—Rotors specially for elastic fluids for axial flow pumps
    • F04D29/325—Rotors specially for elastic fluids for axial flow pumps for axial flow fans
    • F04D29/329—Details of the hub
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/52—Casings; Connections of working fluid for axial pumps
    • F04D29/522—Casings; Connections of working fluid for axial pumps especially adapted for elastic fluid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/5806—Cooling the drive system
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/582—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps
    • F04D29/5853—Cooling; Heating; Diminishing heat transfer specially adapted for elastic fluid pumps heat insulation or conduction
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/60—Mounting; Assembling; Disassembling
    • F04D29/64—Mounting; Assembling; Disassembling of axial pumps
    • F04D29/644—Mounting; Assembling; Disassembling of axial pumps especially adapted for elastic fluid pumps
    • F04D29/646—Mounting or removal of fans
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K5/00—Casings; Enclosures; Supports
    • H02K5/04—Casings or enclosures characterised by the shape, form or construction thereof
    • H02K5/20—Casings or enclosures characterised by the shape, form or construction thereof with channels or ducts for flow of cooling medium
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K9/00—Arrangements for cooling or ventilating
    • H02K9/02—Arrangements for cooling or ventilating by ambient air flowing through the machine
    • H02K9/04—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium
    • H02K9/06—Arrangements for cooling or ventilating by ambient air flowing through the machine having means for generating a flow of cooling medium with fans or impellers driven by the machine shaft

Abstract

The invention discloses a fire-fighting smoke exhaust fan which comprises a shell, a heat insulation cavity, a motor, an impeller and a hub heat insulation device, wherein the heat insulation cavity is a cavity penetrating through the shell, the motor is fixed in the heat insulation cavity, a space is reserved between the motor and the wall of the heat insulation cavity, the impeller is arranged in the shell and comprises a hub and radiating blades, the radiating blades are fixed on the hub, the hub heat insulation device is arranged on the outer side of the hub and used for isolating the hub from passing high-temperature air, and an output shaft of the motor penetrates through the wall of the heat insulation cavity to be fixedly connected with. Keep apart the motor and the high temperature air through smoke exhaust fan through thermal-insulated chamber, thermal-insulated chamber and external environment direct intercommunication, the direct and external air contact of motor surface dispels the heat, the motor is introduced the motor inside with the external air through the cooling fan of self and is dispelled the heat simultaneously, the two combined action dispels the heat to the motor, heat-proof device is adopted in the wheel hub outside, avoids wheel hub and high temperature air direct contact, guarantees that motor spindle temperature can not be too high.

Description

Fire-fighting smoke exhaust fan
Technical Field
The invention relates to the technical field of fire-fighting fans, in particular to a fire-fighting smoke exhaust fan.
Background
At present, the maximum temperature resistant time of the smoke exhaust fan in domestic and international markets is 300 ℃/2h, the equipment is not damaged, and the past method comprises the following steps: 1. the motor is totally wrapped, the cooling fan utilizing the motor self introduces the motor into the gas outside the machine through the steel pipe, the gas outside the machine is led out through the steel pipe at the other end, the motor is completely wrapped, so the introduced gas can only cool the inside of the motor, the wrapping layer is contacted with the motor, and the hot air outside the wrapping layer can transfer heat to the surface of the motor through the wrapping layer, so that the surface temperature can not be reduced. 2. The motor is coated by 2 layers, flowing tap water is injected into the middle gap of the coating material to cool down, the surface of the motor is cooled down, and heat generated by the motor during working can not be dissipated inside the motor. 3. The motor is completely coated, the small fan outside the motor is used for forcibly ventilating the surface of the motor to cool, the interior of the motor cannot be cooled, and the cooling effect is poor due to inevitable heat exchange between the entering gas and the high-temperature gas passing through the fan. Although the three high-temperature resistant modes can pass through 300 ℃/2h equipment during a high-temperature resistant test without damage, the manufacturing cost is slightly higher, and the high-temperature resistant mode cannot really run for a long time.
Disclosure of Invention
The invention aims to provide a fire-fighting smoke exhaust fan, which aims to solve the problems in the prior art and solve the problem that the fire-fighting smoke exhaust fan is limited in use by the temperature and the working time of high-temperature gas passing through the fire-fighting smoke exhaust fan during working.
In order to achieve the purpose, the invention provides the following scheme:
the invention provides a fire-fighting smoke exhaust fan which comprises a shell, a heat insulation cavity, a motor, an impeller and a hub heat insulation device, wherein the shell is provided with an air inlet and an air outlet, the air inlet and the air outlet are respectively and fixedly connected with two ventilation pipelines, high-temperature air is exhausted through the ventilation pipelines, the heat insulation cavity is a cavity penetrating through the shell, the motor is fixed in the heat insulation cavity and is spaced from the wall of the heat insulation cavity, the impeller is arranged in the shell and comprises a hub and radiating blades, the radiating blades are fixed on the hub, the hub heat insulation device is arranged outside the hub and is used for isolating the hub from the passing high-temperature air, and an output shaft of the motor penetrates through the wall of the heat insulation cavity and is fixedly connected with the hub.
Preferably, the housing is of a cylindrical structure.
Preferably, the heat insulation cavity is a horizontal hollow cavity with a square cross section.
Preferably, four corners of the square section are streamlined.
Preferably, the centre line of the insulating cavity is perpendicular to the housing axis.
Preferably, the hub heat insulation device is a heat shield.
Preferably, the housing is fixed to the base.
Preferably, the top of the shell is fixedly connected with a hoisting ring.
Preferably, the motor is fixed in the heat insulation cavity through a fixing rib plate.
Compared with the prior art, the invention has the following technical effects: the invention provides a fire-fighting smoke exhaust fan which comprises a shell, a heat insulation cavity, a motor, an impeller and a hub heat insulation device, wherein the shell is provided with an air inlet and an air outlet, the air inlet and the air outlet are respectively and fixedly connected with two ventilating pipelines, high-temperature air is exhausted through the ventilating pipelines, the heat insulation cavity is a cavity penetrating through the shell, the motor is fixed in the heat insulation cavity, a space is reserved between the motor and the wall of the heat insulation cavity, the impeller is arranged in the shell and comprises a hub and radiating blades, the radiating blades are fixed on the hub, the hub heat insulation device is arranged on the outer side of the hub and is used for isolating the hub from the passing high-temperature air. Keep apart the motor and the high temperature air through smoke exhaust fan through thermal-insulated chamber, thermal-insulated chamber and external environment direct intercommunication, the direct and external air contact of motor surface dispels the heat, the motor is introduced the motor inside with the external air through the cooling fan of self and is dispelled the heat simultaneously, the two combined action dispels the heat to the motor, heat-proof device is adopted in the wheel hub outside, avoids wheel hub and high temperature air direct contact, guarantees that motor spindle temperature can not be too high.
Furthermore, the shell is of a cylindrical structure, so that the working range of the radiating blades is adapted, and the material consumption of the shell is reduced as much as possible.
Furthermore, the heat insulation cavity is a horizontal hollow cavity with a square section, so that the heat insulation cavity is adaptive to the shape of the cross section of the motor, and a sufficient gap is reserved between the heat insulation cavity and the motor, so that the motor is convenient to fix.
Furthermore, four corners of the square section are streamline, so that the resistance of high-temperature gas passing through the fan is reduced.
Furthermore, the central line of the heat insulation cavity is perpendicular to the axis of the shell, so that the length of the heat insulation cavity is reduced, and the circulation of air in the heat insulation cavity and external air is quicker.
Further, the heat insulation device of the wheel hub can be selected as a heat shield, so that foreign matters can be prevented from entering the wheel hub while high-temperature air is isolated.
Further, the bottom of the shell is provided with a base for supporting the smoke exhaust fan.
Furthermore, the top of the shell is fixedly connected with a hoisting ring, so that the fan can be moved conveniently.
Further, the motor is fixed in thermal-insulated intracavity through fixed floor, and fixed floor is parallel with thermal-insulated chamber central line, makes things convenient for the motor fixed while, can not block the circulation of thermal-insulated intracavity air.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.
FIG. 1 is a front view of a fire protection and smoke exhaust fan provided by the present invention;
FIG. 2 is a radial cross-sectional view of a fire protection smoke exhaust fan provided by the present invention;
FIG. 3 is a schematic structural view of an impeller of the fire-fighting smoke exhaust fan provided by the present invention;
FIG. 4 is a schematic view of the installation of the smoke exhaust fan for fire fighting and the air flow direction during operation;
FIG. 5 is a cross-sectional view of a thermally insulated chamber of a fire protection and smoke exhaust fan provided in accordance with the present invention.
In the figure: the device comprises a shell 1, a heat insulation cavity 2, a motor 3, an impeller 4, a hub heat insulation device 5, a fixed rib plate 6, a base 7 and a hoisting ring 8.
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 invention aims to provide a fire-fighting smoke exhaust fan, which aims to solve the problems in the prior art and prevent the use of the fire-fighting smoke exhaust fan from being limited by the temperature and the working time of high-temperature gas passing through the fire-fighting smoke exhaust fan during working.
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in further detail below.
The embodiment provides a fire-fighting smoke exhaust fan, as shown in fig. 1-3, including shell 1, thermal-insulated chamber 2, motor 3, impeller 4 and wheel hub heat-proof device 5, shell 1 is equipped with air intake and air outlet, air intake and air outlet respectively with two air pipe fixed connection, high-temperature air passes through air pipe and discharges, the air intake is close to impeller 4, the air outlet is close to thermal-insulated chamber 2, thermal-insulated chamber 2 is the cavity that link up shell 1, motor 3 fixes in thermal-insulated chamber 2, and leave the interval with thermal-insulated chamber 2 inner wall, impeller 4 sets up in shell 1, impeller 4 includes wheel hub and radiating blade, radiating blade fixes on wheel hub, the wheel hub outside is equipped with wheel hub heat-proof device 5, wheel hub heat-proof device 5 is used for keeping apart wheel hub and the high-temperature air that passes through, motor 3 output. Keep apart motor 3 and the high temperature air through smoke exhaust fan through thermal-insulated chamber 2, thermal-insulated chamber 2 directly communicates with external environment, the direct and outside air contact of 3 surfaces of motor dispels the heat, motor 3 introduces motor 3 inside with the outside air through the cooling fan of self simultaneously and dispels the heat, the two combined action dispels the heat to motor 3, heat-proof device 5 is adopted in the wheel hub outside, avoid wheel hub and high temperature air direct contact, guarantee that 3 main shaft temperatures of motor can not be too high.
Furthermore, the shell 1 is of a cylindrical structure, so that the working range of the radiating blades is adapted, and the material consumption of the shell 1 is reduced as much as possible.
Furthermore, the heat insulation cavity 2 is a horizontal hollow cavity with a square cross section, so that the heat insulation cavity adapts to the shape of the cross section of the motor 3, and a sufficient gap is reserved between the heat insulation cavity and the motor 3, so that the motor 3 can be conveniently fixed.
Further, as shown in fig. 5, four corners of the square cross section are streamline, so that the resistance of high-temperature gas passing through the fan is reduced.
Furthermore, the central line of the heat insulation cavity 2 is vertical to the axis of the shell 1, so that the length of the heat insulation cavity 2 is reduced, and the circulation of air in the heat insulation cavity 2 and outside air is quicker.
Further, the hub heat insulation device 5 can be selected as a heat shield to prevent foreign matters from entering the hub while isolating high-temperature air.
Further, the bottom of the shell 1 is provided with a base 7 for supporting the smoke exhaust fan.
Furthermore, the top of the shell 1 is fixedly connected with a hoisting ring 8, so that the fan can be moved conveniently.
Further, motor 3 passes through fixed floor 6 to be fixed in thermal-insulated intracavity, and fixed floor 6 is parallel with 2 central lines in thermal-insulated chamber, makes things convenient for motor 3 fixed while, can not block the circulation of the interior air of thermal-insulated chamber 2.
The principle and the implementation mode of the invention are explained by applying a specific example, and the description of the embodiment is only used for helping to understand the method and the core idea of the invention; meanwhile, for a person skilled in the art, according to the idea of the present invention, the specific embodiments and the application range may be changed. In view of the above, the present disclosure should not be construed as limiting the invention.

Claims (6)

1. The utility model provides a fire control smoke exhaust fan which characterized in that: the method comprises the following steps: the impeller is arranged in the shell and comprises a hub and radiating blades, the radiating blades are fixed on the hub, the hub heat insulation device is arranged on the outer side of the hub and used for isolating the hub from passing high-temperature air, and the motor output shaft penetrates through the heat insulation cavity wall and is fixedly connected with the hub;
the heat insulation cavity is a horizontal hollow cavity with a square cross section; the central line of the heat insulation cavity is vertical to the axis of the shell;
the motor is fixed in the heat insulation cavity through a fixed rib plate, and the fixed rib plate is parallel to the central line of the heat insulation cavity.
2. A fire protection smoke exhaust fan according to claim 1, wherein: the shell is of a cylindrical structure.
3. A fire protection smoke exhaust fan according to claim 1, wherein: the four corners of the square section are streamline.
4. A fire protection smoke exhaust fan according to claim 1, wherein: the hub heat insulation device is a heat shield.
5. A fire protection smoke exhaust fan according to claim 1, wherein: the bottom of the shell is provided with a base.
6. A fire protection smoke exhaust fan according to claim 1, wherein: the top of the shell is fixedly connected with a hoisting ring.
CN201911258488.7A 2019-12-10 2019-12-10 Fire-fighting smoke exhaust fan Active CN111005881B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201911258488.7A CN111005881B (en) 2019-12-10 2019-12-10 Fire-fighting smoke exhaust fan

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201911258488.7A CN111005881B (en) 2019-12-10 2019-12-10 Fire-fighting smoke exhaust fan

Publications (2)

Publication Number Publication Date
CN111005881A CN111005881A (en) 2020-04-14
CN111005881B true CN111005881B (en) 2021-06-29

Family

ID=70115796

Family Applications (1)

Application Number Title Priority Date Filing Date
CN201911258488.7A Active CN111005881B (en) 2019-12-10 2019-12-10 Fire-fighting smoke exhaust fan

Country Status (1)

Country Link
CN (1) CN111005881B (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109139504A (en) * 2018-10-12 2019-01-04 江苏泰华消防电气设备有限公司 A kind of fire-fighting smoke exhaust fan
CN113586516B (en) * 2021-08-27 2023-04-28 哈利法克斯风机(深圳)有限公司 Welded high Wen Lungu, impeller using same and fan

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2307939Y (en) * 1997-04-16 1999-02-17 刘廉成 Furnace energy-saving fan with double-layer internal cooling thermal insulation and anti-corrsive
CN203783977U (en) * 2014-02-26 2014-08-20 公安部四川消防研究所 Aerosol type high-temperature firefighting smoke exhaust fan

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4423447A1 (en) * 1994-07-05 1996-01-11 Turbo Lufttechnik Gmbh Axial ventilator with motor=driven fan
CN101725431A (en) * 2008-10-31 2010-06-09 南昌航空大学 Electric fuel oil jet propeller
CN204729324U (en) * 2015-06-02 2015-10-28 云南红光昭宇科技有限公司 High temperature fire-extinguishing smoke exhausting fan
CN105526181B (en) * 2015-12-03 2018-09-25 湖南巴陵炉窑节能股份有限公司 Air-introduced machine for hot gas
CN206874511U (en) * 2017-06-03 2018-01-12 福建华泰通风空调装备有限公司 A kind of axial-flow type smoke exhaust fan
CN208169178U (en) * 2018-05-22 2018-11-30 刘春凤 Smoke exhaust fan
CN208396964U (en) * 2018-05-31 2019-01-18 河南华鹰机械设备有限公司 The high smoke exhaust fan of heat-sinking capability
CN110360160A (en) * 2019-08-20 2019-10-22 山东专风空调设备有限公司 A kind of electric motor temperature reduction structure of axial-flow type smoke exhaust fan

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN2307939Y (en) * 1997-04-16 1999-02-17 刘廉成 Furnace energy-saving fan with double-layer internal cooling thermal insulation and anti-corrsive
CN203783977U (en) * 2014-02-26 2014-08-20 公安部四川消防研究所 Aerosol type high-temperature firefighting smoke exhaust fan

Also Published As

Publication number Publication date
CN111005881A (en) 2020-04-14

Similar Documents

Publication Publication Date Title
CN111005881B (en) Fire-fighting smoke exhaust fan
CN109424559A (en) A kind of water cooling shielding blower
CN203301294U (en) Sound-absorbing noise reduction apparatus
CN207134921U (en) A kind of intelligent fire resistant special type motor
CN105526181B (en) Air-introduced machine for hot gas
CN207692281U (en) PLC control cabinet suitable for extreme environment
CN108233626B (en) Internal cooling and ventilating system of large synchronous phase modulator
CN207539067U (en) A kind of efficient energy-saving fan
CN203289233U (en) Support type explosion-proof variable frequency motor
CN206727494U (en) A kind of new self radiation type regulator cubicle
CN215633868U (en) Centrifugal fan with high temperature resistant structure
CN211530891U (en) Heat insulation protection and air cooling device for fan motor
CN214791919U (en) Air duct type electric heater
CN210050065U (en) Axial flow fan capable of being used for high temperature
CN102251981B (en) Vertical high-temperature fan
CN211253079U (en) Integrated throat model support rod for subsonic velocity shroud ablation test
CN210290223U (en) Double-speed fan controller box with good fire-fighting smoke discharging effect
CN206419228U (en) A kind of smoke exhaust fan
CN104362798A (en) Air-air cooling brushless excitation synchronous motor
CN105281454A (en) Primary helium circulator driving motor rotor structure
CN205092673U (en) Main helium fan drive electric motor rotor structure
CN212536138U (en) High-temperature-resistant fan
CN204905001U (en) Energy -conserving dry -type transformer
CN220566258U (en) Corrosion-resistant fire control smoke exhaust fan
CN210001890U (en) high-temperature fan impeller sealing structure special for copper strip air cushion type annealing furnace

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
GR01 Patent grant
GR01 Patent grant