CN114545714B - Explosion-proof projection display system - Google Patents
Explosion-proof projection display systemInfo
- Publication number
- CN114545714B CN114545714B CN202210086387.1A CN202210086387A CN114545714B CN 114545714 B CN114545714 B CN 114545714B CN 202210086387 A CN202210086387 A CN 202210086387A CN 114545714 B CN114545714 B CN 114545714B
- Authority
- CN
- China
- Prior art keywords
- explosion
- proof
- pressure
- projector body
- positive pressure
- 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
Links
Classifications
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/145—Housing details, e.g. position adjustments thereof
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/16—Cooling; Preventing overheating
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B21/00—Projectors or projection-type viewers; Accessories therefor
- G03B21/14—Details
- G03B21/18—Fire preventing or extinguishing
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transforming Electric Information Into Light Information (AREA)
- Projection Apparatus (AREA)
Abstract
The invention provides an explosion-proof projection display system, which belongs to the technical field of projection display and comprises an explosion-proof projector body, a positive pressure gas circuit system and an explosion-proof electrical control system, wherein the explosion-proof projector body adopts a sealed structure, the positive pressure gas circuit system is used for providing positive pressure blowing and positive pressure maintaining for the explosion-proof projector body, and the explosion-proof electrical control system is used for controlling the working state of the positive pressure gas circuit system and the opening and closing of the explosion-proof projector body. The invention has the advantages of good explosion prevention and heat dissipation.
Description
Technical Field
The invention relates to the technical field of projection display, in particular to an explosion-proof projection display system.
Background
With the rapid development of technology, projectors as display devices are increasingly used, and varieties are also increasing. The requirements of people on projection display are also higher and higher, and the requirements of large size, high definition and high brightness are that the requirements of the projection display chip and the light path design are strict, and a high-power projection light source is also needed. However, since metal halogen lamps, fluorescent lamps, lasers are currently used as projection light sources, electric sparks are inevitably generated or a hot surface is formed during operation, which, once they meet with explosive gases, dust or other mixtures at the production or rescue site, may lead to explosion accidents.
Therefore, it has become an important issue to prevent the projection display device from explosion accidents in dangerous places where explosive gases, dust or a mixture thereof exist.
Disclosure of Invention
In view of the above, the present invention provides an explosion-proof projection display system, which has the advantages of good explosion-proof and heat dissipation.
In order to solve the technical problems, the invention provides an explosion-proof projection display system, which comprises an explosion-proof projector body, a positive pressure gas circuit system and an explosion-proof electrical control system, wherein the explosion-proof projector body adopts a sealed structure, the positive pressure gas circuit system is used for providing positive pressure blowing and positive pressure maintaining for the explosion-proof projector body, and the explosion-proof electrical control system is used for controlling the working state of the positive pressure gas circuit system and the opening and closing of the explosion-proof projector body.
Further, the explosion-proof projector body comprises a projector body, an air inlet pressure buffer box and an air outlet pressure buffer box, wherein the outer shell of the projector body is airtight, the air inlet pressure buffer box and the air outlet pressure buffer box are respectively communicated with two sides of the outer shell of the projector body, a positive pressure air source inlet of the air inlet pressure buffer box is communicated with a positive pressure air source outlet of the positive pressure air circuit system through a pipeline, and an air outlet valve is arranged on the air outlet pressure buffer box.
Further, an air inlet heat radiation fan is arranged between the air inlet pressure buffer box and the projector body.
Further, an exhaust heat dissipation fan is arranged between the exhaust pressure buffer box and the projector body.
Further, a pressure detection port and an audio/video signal line mounting hole are formed in the exhaust pressure buffer box, the pressure detection port is connected with a pressure difference switch in the positive pressure gas circuit system through a pipeline, the audio/video signal line mounting hole is used for mounting an audio/video signal line for monitoring multimedia monitoring of the explosion-proof projector body, and the audio/video signal line is connected with the explosion-proof electrical control system.
Further, a cable mounting hole is formed in the air inlet pressure buffer box and used for mounting a control cable for controlling the opening and closing of the explosion-proof projector body, and the control cable is connected with the explosion-proof electrical control system.
Further, the positive pressure gas path system comprises a differential pressure switch, a high-pressure ball valve, a pressure reducing valve, a one-way throttle valve, a thread stop valve, an explosion-proof flow switch and a flowmeter which are sequentially connected together along the flow direction of the positive pressure gas path through a pipeline, wherein an inlet of the high-pressure ball valve is communicated with an inlet of a positive pressure explosion-proof gas source through a pipeline, an outlet of the flowmeter is communicated with an outlet of the positive pressure explosion-proof gas source through a pipeline, an electromagnetic valve is connected in parallel on the one-way throttle valve, the electromagnetic valve is connected with the explosion-proof electrical control system through an electromagnetic valve control cable, the explosion-proof flow switch is connected with the explosion-proof electrical control system through a flow switch control cable, a gas connecting end of the differential pressure switch is connected with the pressure detection port through a pipeline, and a signal end of the differential pressure switch is connected with the explosion-proof electrical control system through a differential pressure switch control cable.
Further, the positive pressure explosion-proof air source adopted by the positive pressure air circuit system is compressed air or compressed inert gas.
Further, the explosion-proof electrical control system comprises a work indicator lamp, a power indicator lamp, a lower pressure limit alarm indicator lamp, a ventilation indicator lamp, an upper pressure limit alarm indicator lamp, a system stop button, a system start button and a cable interface which are arranged on the control circuit board.
Further, an electrical interlock is adopted between the explosion-proof electrical control system and the power supply of the explosion-proof projector body.
Further, the explosion-proof electrical control system is provided with a grounding end.
Further, four corners of the explosion-proof electrical control system are provided with fixing plates with fixing holes.
Further, the explosion-proof method of the explosion-proof projection display system comprises the following steps:
s1, opening a high-pressure ball valve of a positive pressure gas circuit system, and introducing compressed air into a positive pressure cavity of an explosion-proof projector body;
s2, switching on a power supply of an explosion-proof electrical control system;
S3, pressing a system start button on the explosion-proof electrical control system, and automatically entering a purging state by the positive pressure gas circuit system;
s4, after purging for 0.1 min-20 min, sending a signal allowing a user to start to the explosion-proof projector body, and enabling the positive pressure gas circuit system to perform closed-loop control so as to keep the internal pressure of the explosion-proof projector body between 70 Pa-400 Pa;
S5, when the air circuit fails, the system starts to send an alarm signal to remind operators on duty to process when the pressure in the positive pressure cavity of the explosion-proof projector body is lower than 150Pa or higher than 400Pa, and when the pressure in the positive pressure cavity of the explosion-proof projector body is lower than 70Pa, the system immediately and automatically cuts off the input power supply of the explosion-proof projector body so as to ensure that explosion danger is not generated.
The technical scheme of the invention has the following beneficial effects:
1. The explosion-proof projection display system has the advantages of simple structure, explosion resistance, impact resistance, strong heat dissipation capability and good sealing property.
2. The explosion-proof projection display system is formed by combining three parts, namely an explosion-proof projector body (positive pressure cavity), an explosion-proof electrical control system (positive pressure control system) and a positive pressure gas circuit system, wherein the three parts can be combined and placed or can be separated and placed. The explosion-proof projector body (positive pressure cavity) is preferably arranged separately from the explosion-proof electrical control system (positive pressure control system) and the positive pressure gas circuit system and is connected with the control cable through a metal flexible connecting pipeline.
Drawings
FIG. 1 is a schematic diagram of an explosion-proof projection display system according to the present invention;
FIG. 2 is a schematic diagram of an explosion-proof projector according to the present invention;
FIG. 3 is a schematic diagram of an explosion-proof electrical control system according to the present invention;
FIG. 4 is a schematic diagram of the connection between the positive pressure gas circuit system and the explosion-proof electrical control system according to the present invention;
FIG. 5 is a logic diagram of positive pressure control of the explosion-proof electrical control system of the present invention;
Reference numerals:
The explosion-proof projector body 100, the projector body 110, the air intake pressure buffer tank 120, the positive pressure air source inlet 121, the cable mounting hole 122, the exhaust pressure buffer tank 130, the exhaust valve 131, the air intake radiator fan 140, the exhaust radiator fan 150, the pressure detection port 160, the audio/video signal line mounting hole 170, the positive pressure air path system 200, the pressure difference switch 210, the high pressure ball valve 220, the positive pressure explosion-proof air source inlet 221, the pressure reducing valve 230, the one-way throttle valve 240, the threaded stop valve 250, the explosion-proof flow switch 260, the flowmeter 270, the positive pressure explosion-proof air source outlet 271, the electromagnetic valve 280, the explosion-proof electrical control system 300, the fixing plate 301, the work indicator 310, the power indicator 320, the pressure lower limit alarm indicator 330, the ventilation indicator 340, the pressure upper limit alarm indicator 350, the system stop button 360, the system start button 370, the cable interface 380 and the grounding end 390.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to fig. 1 to 5 of the embodiments of the present invention. It will be apparent that the described embodiments are some, but not all, embodiments of the invention. All other embodiments, which are obtained by a person skilled in the art based on the described embodiments of the invention, fall within the scope of protection of the invention.
1-5, The explosion-proof projection display system comprises an explosion-proof projector body, a positive pressure gas circuit system and an explosion-proof electrical control system, wherein the explosion-proof projector body adopts a sealed structure, the positive pressure gas circuit system is used for providing positive pressure purging and positive pressure maintaining for the explosion-proof projector body, and the explosion-proof electrical control system is used for controlling the working state of the positive pressure gas circuit system and the opening and closing of the explosion-proof projector body.
Specifically, as shown in fig. 1, the explosion-proof projection display system comprises an explosion-proof projector body 100, a positive pressure gas circuit system 200 and an explosion-proof electrical control system 300, wherein the explosion-proof projector body 100 adopts a sealed structure, the positive pressure gas circuit system 200 is used for providing positive pressure purging and positive pressure maintaining for the explosion-proof projector body 100, and the explosion-proof electrical control system 300 is used for controlling the working state of the positive pressure gas circuit system 200 and the opening and closing of the explosion-proof projector body 100.
According to an embodiment of the present invention, as shown in fig. 2 and 1, the explosion-proof projector body 100 includes a projector body 110, an air inlet pressure buffer tank 120 and an air outlet pressure buffer tank 130, wherein the housing of the projector body 110 has air tightness, the air inlet pressure buffer tank 120 and the air outlet pressure buffer tank 130 are respectively and communicatively disposed at two sides of the housing of the projector body 110, the positive pressure air source inlet 121 of the air inlet pressure buffer tank 120 is communicated with the positive pressure explosion-proof air source outlet 271 of the positive pressure air path system 200 through a pipeline, and the air outlet valve 131 is mounted on the air outlet pressure buffer tank 130.
In this embodiment, the explosion-proof projection display system is formed by combining three parts, namely an explosion-proof projector body (positive pressure cavity), an explosion-proof electrical control system (positive pressure control system) and a positive pressure gas circuit system, and the three parts can be placed in a combined mode or can be placed separately. The explosion-proof projector body (positive pressure cavity) is preferably arranged separately from the explosion-proof electrical control system (positive pressure control system) and the positive pressure gas circuit system and is connected with the control cable through a metal flexible connecting pipeline.
In this embodiment, the explosion-proof projector body 100 is formed by adding the air inlet pressure buffer tank 120 and the air outlet pressure buffer tank 130 on the basis of the original projector body 110, the housing of the projector body 110 has air tightness, the heat dissipation device of the original projector body 110 can be reserved, the positive pressure air source inlet 121 of the air inlet pressure buffer tank 120 is communicated with the positive pressure explosion-proof air source outlet 271 of the positive pressure air path system 200 through a pipeline, and the air outlet valve 131 is installed on the air outlet pressure buffer tank 130, and the installation position of the air outlet valve 131 is provided with a flame arrester, so that when the pressure in the housing of the projector body 110 is too high, the air can be exhausted by operating the air outlet valve 131. In addition, the housing of the projector body 110 is an airtight housing made of steel plate or aluminum alloy, and can effectively prevent the external explosive gas mixture from entering the interior of the housing because it can maintain the pressure of the internal shielding gas higher than the pressure of the surrounding explosive gas environment.
According to an embodiment of the present invention, as shown in fig. 2, an air intake and heat dissipation fan 140 is disposed between the air intake pressure buffer tank 120 and the projector body 110.
In this embodiment, in order to improve the positive pressure purging performance of the positive pressure explosion-proof air source to the inner cavity of the explosion-proof projector body and the heat dissipation performance of the projector body, the air intake and heat dissipation fans 140 are disposed between the air intake pressure buffer box 120 and the projector body 110, and the number of the air intake and heat dissipation fans 140 is not limited, and may be 1, or may be multiple, and may be disposed in a row.
According to an embodiment of the present invention, as shown in fig. 2, an exhaust heat dissipation fan 150 is disposed between the exhaust pressure buffer tank 130 and the projector body 110.
In this embodiment, in order to further improve the positive pressure purging performance of the positive pressure explosion-proof air source to the inner cavity of the explosion-proof projector body and the heat dissipation performance of the projector body, an exhaust heat dissipation fan 150 is disposed between the exhaust pressure buffer tank 130 and the projector body 110, and the number of the exhaust heat dissipation fans 150 is not limited, and may be 1, or may be a plurality, and may be disposed in a row.
According to an embodiment of the present invention, as shown in fig. 2 and 1, the exhaust pressure buffer tank 130 is provided with a pressure detection port 160 and an audio/video signal line mounting hole 170, the pressure detection port 160 is connected to a pressure difference switch 210 in the positive pressure gas circuit system 200 through a pipeline, the audio/video signal line mounting hole 170 is used for mounting an audio/video signal line for monitoring the multimedia monitoring of the explosion-proof projector body 100, and the audio/video signal line is connected to the explosion-proof electrical control system 300.
According to an embodiment of the present invention, as shown in fig. 2 and 1, a cable installation hole 122 is provided on the air intake pressure buffer tank 120, the cable installation hole 122 is used for installing a control cable for controlling the opening and closing of the explosion-proof projector body 100, and the control cable is connected with the explosion-proof electrical control system 300.
According to one embodiment of the present invention, as shown in fig. 4, the positive pressure gas path system 200 includes a differential pressure switch 210, a high pressure ball valve 220, a pressure reducing valve 230, a one-way throttle valve 240, a threaded stop valve 250, an explosion-proof flow switch 260 and a flowmeter 270 sequentially connected together along the flow direction of the positive pressure gas path through a pipeline, wherein the inlet of the high pressure ball valve 220 is communicated with a positive pressure explosion-proof gas source inlet 221 through a pipeline, the outlet of the flowmeter 270 is communicated with a positive pressure explosion-proof gas source outlet 271 through a pipeline, a solenoid valve 280 is connected in parallel with the one-way throttle valve 240, the solenoid valve 280 is connected with the explosion-proof electrical control system 300 through a solenoid valve control cable, the explosion-proof flow switch 260 is connected with the explosion-proof electrical control system 300 through a flow switch control cable, the gas connection end of the differential pressure switch 210 is connected with the pressure detection port 160 through a pipeline, and the signal end of the differential pressure switch 210 is connected with the explosion-proof electrical control system 300 through a differential pressure switch control cable.
According to one embodiment of the present invention, the positive pressure explosion-proof air source used in the positive pressure air path system 200 is compressed air.
In this embodiment, the positive pressure explosion-proof air source adopted by the positive pressure air path system 200 is compressed air, and of course, other compressed inert gases, such as compressed nitrogen, compressed argon, compressed helium, etc., may be adopted, and the positive pressure explosion-proof air source is decompressed to become pure micro-pressure air, and then enters the positive pressure outer shell of the explosion-proof projector, and after a period of positive pressure air purge, the explosive gas in the shell is removed, and the positive pressure is kept continuously, so that the interior of the shell becomes a safe place.
According to one embodiment of the present invention, as shown in fig. 3, the explosion-proof electrical control system 300 includes a work indicator 310, a power indicator 320, a lower pressure alarm indicator 330, a ventilation indicator 340, an upper pressure alarm indicator 350, a system stop button 360, a system start button 370, and a cable interface 380, which are mounted on a control circuit board.
According to one embodiment of the present invention, an electrical interlock is employed between the explosion-proof electrical control system 300 and the power source of the explosion-proof projector body 100.
In this embodiment, the explosion-proof electrical control system 300 is electrically interlocked with the power supply of the explosion-proof projector body 100, and only when the positive pressure housing of the explosion-proof projector body 100 is purged for a period of time and the pressure in the explosion-proof projector body 100 is greater than a certain value (for example, 70 Pa), the power supply of the explosion-proof projector body 100 is energized, so that the explosion-proof projector body 100 can be operated.
According to one embodiment of the present invention, as shown in fig. 3, in order to timely guide static electricity on the explosion-proof electrical control system 300 to the ground, a ground terminal 390 is provided on the explosion-proof electrical control system 300 for safety.
According to an embodiment of the present invention, as shown in fig. 3, in order to integrally mount the explosion-proof electrical control system 300 on the explosion-proof projector body 100 or the positive pressure gas circuit system 200, fixing plates 301 with fixing holes are provided at four corners of the explosion-proof electrical control system 300.
According to another embodiment of the present invention, an explosion-proof method of the explosion-proof projection display system includes the steps of:
s1, opening a high-pressure ball valve of a positive pressure gas circuit system, and introducing compressed air into a positive pressure cavity of an explosion-proof projector body;
s2, switching on a power supply of the explosion-proof electrical control system, and lighting a power supply indicator lamp;
s3, pressing a system start button on the explosion-proof electrical control system, and automatically entering a purging state by the positive pressure gas circuit system, and turning on a ventilation indicator lamp;
S4, after purging for a period of time, the ventilation indicator lamp is turned off, the working indicator lamp is turned on, and meanwhile, a signal allowing a user to start is sent to the explosion-proof projector body, and the positive pressure gas circuit system is subjected to closed-loop control, so that the internal pressure of the explosion-proof projector body is kept between 70Pa and 400 Pa;
s5, when the air circuit fails and the pressure in the positive pressure cavity of the explosion-proof projector body is lower than 150Pa or higher than 400Pa, the lower limit alarm indicator lamp or the upper limit alarm indicator lamp of the panel is on, the system starts to send alarm signals to remind operators on duty to process, and when the pressure in the positive pressure cavity of the explosion-proof projector body is lower than 70Pa, the working indicator lamp is off, the system immediately and automatically cuts off the input power supply of the explosion-proof projector body so as to ensure that explosion danger is not generated.
The working method (or working principle) of the invention is as follows:
As shown in FIG. 5, the system is a positive pressure control logic diagram of the explosion-proof electrical control system, and in operation, a high-pressure ball valve of the positive pressure gas circuit system is opened to introduce compressed air into a positive pressure cavity of the explosion-proof projector body, a power supply of the explosion-proof electrical control system is connected, a power supply indicator lamp is turned on, a system start button on the explosion-proof electrical control system is pressed, the positive pressure gas circuit system automatically enters a purging state, and a ventilation indicator lamp is turned on. When the air is purged for a period of time, the ventilation indicator lamp is turned off, the working indicator lamp is turned on, and meanwhile, an enabling signal for enabling a user to start is sent to the explosion-proof projector body, and at the moment, the explosion-proof projector body starts to work normally.
During normal operation, the working indicator lamp on the explosion-proof electrical control system is on, and the positive pressure gas circuit system of the explosion-proof projection system performs closed-loop control, so that the internal pressure of the explosion-proof projector body is kept between 70Pa and 400 Pa. When the pressure in the positive pressure cavity of the explosion-proof projector body is lower than 150Pa or 400Pa, the lower limit alarm indicator lamp or the upper limit alarm indicator lamp of the panel is on, the system starts to send alarm signals to remind operators on duty to process, and when the pressure in the positive pressure cavity of the explosion-proof projector body is lower than 70Pa, the working indicator lamp is off, the system immediately and automatically cuts off the input power supply of the explosion-proof projector body so as to ensure that explosion danger is not generated.
When the positive pressure system is restarted, the system will resume operating as per the above operating steps, starting timing from the purge.
In the present invention, unless explicitly specified and defined otherwise, for example, it may be fixedly connected, detachably connected or integrally formed, mechanically connected, electrically connected, directly connected, indirectly connected through an intermediate medium, connected internally of two elements or the interaction relationship of two elements, and the specific meaning of the terms in the present invention will be understood by those skilled in the art according to the specific circumstances unless explicitly defined otherwise.
While the foregoing is directed to the preferred embodiments of the present invention, it will be appreciated by those skilled in the art that various modifications and adaptations can be made without departing from the principles of the present invention, and such modifications and adaptations are intended to be comprehended within the scope of the present invention.
Claims (7)
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210086387.1A CN114545714B (en) | 2022-01-25 | 2022-01-25 | Explosion-proof projection display system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210086387.1A CN114545714B (en) | 2022-01-25 | 2022-01-25 | Explosion-proof projection display system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN114545714A CN114545714A (en) | 2022-05-27 |
| CN114545714B true CN114545714B (en) | 2025-08-12 |
Family
ID=81671543
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210086387.1A Active CN114545714B (en) | 2022-01-25 | 2022-01-25 | Explosion-proof projection display system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN114545714B (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202943055U (en) * | 2012-12-07 | 2013-05-22 | 北京前锋科技有限公司 | Motor positive pressure purging control device |
| CN207083338U (en) * | 2017-07-05 | 2018-03-09 | 南阳市一通防爆电气有限公司 | A kind of intelligent positive-pressure explosion-proof switch board |
| CN216696966U (en) * | 2022-01-25 | 2022-06-07 | 河南宏昌科技有限公司 | Explosion-proof projection display system |
Family Cites Families (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0548939A (en) * | 1991-08-09 | 1993-02-26 | Natl Space Dev Agency Japan<Nasda> | Explosion-proof camera |
| JP3736335B2 (en) * | 2000-11-14 | 2006-01-18 | ヤマハ株式会社 | Video projector |
| US7379155B2 (en) * | 2004-10-18 | 2008-05-27 | Asml Netherlands B.V. | Lithographic apparatus and device manufacturing method |
| CN2916698Y (en) * | 2006-02-10 | 2007-06-27 | 苗军虎 | Projection type explosion-proof display |
| JP6007478B2 (en) * | 2011-11-02 | 2016-10-12 | 株式会社リコー | Image display device |
| CN102883125A (en) * | 2012-09-21 | 2013-01-16 | 厦门美屏电子有限公司 | Splicing-free oversize-screen display system |
| CN103217860A (en) * | 2013-02-04 | 2013-07-24 | 芜湖雅图数字视频技术有限公司 | Projector system with dustproof and dust-removal function |
| CN203745787U (en) * | 2013-12-27 | 2014-07-30 | 江苏国资源系统工程有限公司 | DLP projector cooling device |
| JP2017090753A (en) * | 2015-11-13 | 2017-05-25 | 株式会社リコー | Image projection device |
| CN108535941A (en) * | 2018-06-14 | 2018-09-14 | 上海中匆光电科技有限公司 | A kind of explosion-proof type display equipment |
| CN210466763U (en) * | 2019-05-08 | 2020-05-05 | 重庆工程职业技术学院 | A projector for information-based teaching engineering class image recognition teaching |
-
2022
- 2022-01-25 CN CN202210086387.1A patent/CN114545714B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202943055U (en) * | 2012-12-07 | 2013-05-22 | 北京前锋科技有限公司 | Motor positive pressure purging control device |
| CN207083338U (en) * | 2017-07-05 | 2018-03-09 | 南阳市一通防爆电气有限公司 | A kind of intelligent positive-pressure explosion-proof switch board |
| CN216696966U (en) * | 2022-01-25 | 2022-06-07 | 河南宏昌科技有限公司 | Explosion-proof projection display system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN114545714A (en) | 2022-05-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US6494581B2 (en) | Lamp house and projector device thereof | |
| CN220121752U (en) | A kind of fireproof housing of circuit breaker | |
| CN216696966U (en) | Explosion-proof projection display system | |
| CN114545714B (en) | Explosion-proof projection display system | |
| KR101322468B1 (en) | Led explosion proof type lamp | |
| CN206650959U (en) | A kind of explosion-protection equipment for low-pressure electric cabinet | |
| CN119207951A (en) | An oil-immersed transformer with explosion-proof protection structure | |
| CN210273131U (en) | High-voltage power distribution cabinet | |
| EP3816508A1 (en) | Internal-circulating heat dissipation system for stage light | |
| CN211879924U (en) | Power distribution cabinet with explosion-proof and heat dissipation functions | |
| EP0068417B1 (en) | Endoscope light source apparatus | |
| CN206620099U (en) | A kind of photovoltaic combiner box of safe constant temperature | |
| CN218772630U (en) | A dust-proof and cooling device for electric control cabinet | |
| CN104832797A (en) | Flameproof type LED (Light Emitting Diode) explosion-proof lamp | |
| CN212573258U (en) | Positive pressure explosion-proof control cabinet | |
| CN205611138U (en) | High -power explosion -proof ventilation model malleation switch board of 35kW -200kW level | |
| CN211295807U (en) | Switch board with fire prevention heat dissipation function | |
| CN204967032U (en) | Explosion -proof distribution box | |
| CN223595871U (en) | A high-power LED explosion-proof light | |
| CN222282540U (en) | Block terminal with good leakproofness | |
| CN223622855U (en) | A stage flat panel film and television light oil-cooled high-efficiency and silent heat dissipation device | |
| CN223362148U (en) | Explosion-proof type gas detection device | |
| CN209390439U (en) | A kind of ultraviolet radiator water proof and dust proof anti-explosion electronic ballast | |
| CN111184963B (en) | Protection device for industrial control equipment | |
| CN220457799U (en) | Air-cooled double-fan control cabinet with protection function |
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 |