An explosion-proof projection display system

Abstract

The present invention provides an explosion-proof projection display system, belonging to the field of projection display technology. The system comprises an explosion-proof projector, a positive-pressure air system, and an explosion-proof electrical control system. The explosion-proof projector employs a sealed structure, the positive-pressure air system provides positive-pressure purge and pressure maintenance to the projector, and the electrical control system controls the operating state of the positive-pressure air system and the opening and closing of the projector. The present invention offers excellent explosion-proof and heat-dissipating advantages.

Description

Technical Field

[0001] The present invention relates to the technical field of projection display, and in particular to an explosion-proof projection display system. Background Art

[0002] With the rapid development of technology, projectors are becoming increasingly widespread and diverse as display devices. People's expectations for projection displays are also growing, with requirements for large size, high definition, and high brightness. These demands not only place stringent requirements on projection display chips and optical path design, but also require high-power projection light sources. However, since metal halide lamps, fluorescent lamps, and lasers are commonly used as projection light sources, they inevitably generate sparks or form hot surfaces during operation. If these come into contact with explosive gases, dust, or other mixtures at production or rescue sites, they can cause explosions.

[0003] Therefore, how to prevent explosion accidents of projection display devices in dangerous places where explosive gases, dust or mixtures thereof exist has become a very important issue. Summary of the Invention

[0004] In view of this, the present invention provides an explosion-proof projection display system, which has the advantages of good explosion protection and heat dissipation.

[0005] In order to solve the above technical problems, the present invention provides an explosion-proof projection display system, including an explosion-proof projector body, a positive pressure air circuit system and an explosion-proof electrical control system. The explosion-proof projector body adopts a sealed structure, the positive pressure air circuit system is used to provide positive pressure purge and positive pressure maintenance to the explosion-proof projector body, and the explosion-proof electrical control system is used to control the working state of the positive pressure air circuit system and the opening and closing of the explosion-proof projector body.

[0006] Furthermore, the explosion-proof projector body includes a projector body, an air intake pressure buffer box and an exhaust pressure buffer box. The outer shell of the projector body is airtight. The air intake pressure buffer box and the exhaust pressure buffer box are respectively connected and arranged on both sides of the outer shell of the projector body; the positive pressure air source inlet of the air intake pressure buffer box is connected to the positive pressure air source outlet of the positive pressure air circuit system through a pipeline, and an exhaust valve is installed on the exhaust pressure buffer box.

[0007] Furthermore, an air intake cooling fan is provided between the air intake pressure buffer box and the projector body.

[0008] Furthermore, an exhaust cooling fan is provided between the exhaust pressure buffer box and the projector body.

[0009] Furthermore, the exhaust pressure buffer box is provided with a pressure detection port and an audio and video signal line installation hole. The pressure detection port is connected to the pressure differential switch in the positive pressure air circuit system through a pipeline. The audio and video signal line installation hole is used to install the audio and video signal line of the multimedia monitoring of the explosion-proof projector body, and the audio and video signal line is connected to the explosion-proof electrical control system.

[0010] Furthermore, the air intake pressure buffer box is provided with a cable installation hole, the cable installation hole is used to install a control cable for controlling the opening and closing of the explosion-proof projector body, and the control cable is connected to the explosion-proof electrical control system.

[0011] Furthermore, the positive pressure air circuit system includes a pressure differential switch and a high-pressure ball valve, a pressure reducing valve, a one-way throttle valve, a threaded stop valve, an explosion-proof flow switch and a flow meter connected together in sequence through a pipeline along the flow direction of the positive pressure air circuit, the inlet of the high-pressure ball valve is connected to the inlet of the positive pressure explosion-proof air source through a pipeline, the outlet of the flow meter is connected to the outlet of the positive pressure explosion-proof air source through a pipeline, a solenoid valve is connected in parallel to the one-way throttle valve, the solenoid valve is connected to the explosion-proof electrical control system through a solenoid valve control cable, the explosion-proof flow switch is connected to the explosion-proof electrical control system through a flow switch control cable, the gas connection end of the pressure differential switch is connected to the pressure detection port through a pipeline, and the signal end of the pressure differential switch is connected to the explosion-proof electrical control system through a pressure differential switch control cable.

[0012] Furthermore, the positive pressure explosion-proof gas source used by the positive pressure gas circuit system is compressed air or compressed inert gas.

[0013] Furthermore, the explosion-proof electrical control system includes a working indicator light, a power indicator light, a lower pressure limit alarm indicator light, a ventilation indicator light, an upper pressure limit alarm indicator light, a system stop button, a system start button and a cable interface installed on the control circuit board.

[0014] Furthermore, an electrical interlock is adopted between the explosion-proof electrical control system and the power supply of the explosion-proof projector body.

[0015] Furthermore, the explosion-proof electrical control system is provided with a grounding terminal.

[0016] Furthermore, fixing plates with fixing holes are provided at the four corners of the explosion-proof electrical control system.

[0017] Furthermore, the explosion-proof method of the explosion-proof projection display system comprises the following steps:

[0018] S1. Open the high-pressure ball valve of the positive pressure air system to introduce compressed air into the positive pressure cavity of the explosion-proof projector body;

[0019] S2. Turn on the power supply of the explosion-proof electrical control system;

[0020] S3. Press the system start button on the explosion-proof electrical control system, and the positive pressure gas system will automatically enter the purge state;

[0021] S4. After purging for 0.1min to 20min, a user start signal is sent to the explosion-proof projector body, and the positive pressure gas system is closed-loop controlled to keep the internal pressure of the explosion-proof projector body between 70Pa and 400Pa;

[0022] S5. When a fault occurs in the gas circuit and the pressure in the positive pressure chamber of the explosion-proof projector body is lower than the specified working range of 150Pa or higher than the specified working range of 400Pa, the system starts to send out an alarm signal to remind the on-duty personnel to handle it; when the pressure in the positive pressure chamber of the explosion-proof projector body is lower than 70Pa, the system will immediately and automatically cut off the input power of the explosion-proof projector body to ensure that there is no explosion hazard.

[0023] The beneficial effects of the above technical solution of the present invention are as follows:

[0024] 1. The explosion-proof projection display system of the present invention has the advantages of simple structure, explosion-proof and impact-resistant, strong heat dissipation capacity and good sealing.

[0025] 2. The explosion-proof projection display system of the present invention is composed of three components: the explosion-proof projector body (positive pressure chamber), the explosion-proof electrical control system (positive pressure control system), and the positive pressure gas system. These three components can be placed together or separately. Preferably, the explosion-proof projector body (positive pressure chamber), the explosion-proof electrical control system (positive pressure control system), and the positive pressure gas system are placed separately and connected by metal flexible pipes and control cables. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic structural diagram of an explosion-proof projection display system of the present invention;

[0027] Figure 2 This is a schematic structural diagram of the explosion-proof projector body of the present invention;

[0028] Figure 3 It is a structural diagram of the explosion-proof electrical control system of the present invention;

[0029] Figure 4 Schematic diagram of the connection between the positive pressure gas system and the explosion-proof electrical control system in the present invention;

[0030] Figure 5 This is the positive pressure control logic diagram of the explosion-proof electrical control system in the present invention;

[0031] Reference numerals:

[0032] Explosion-proof projector body 100; projector body 110; intake pressure buffer box 120; positive pressure gas source inlet 121; cable mounting hole 122; exhaust pressure buffer box 130; exhaust valve 131; intake cooling fan 140; exhaust cooling fan 150; pressure detection port 160; audio and video signal cable mounting hole 170; positive pressure gas circuit system 200; differential pressure switch 210; high-pressure ball valve 220; positive pressure explosion-proof gas source inlet 221; pressure reducing valve 230; one-way joint Flow valve 240; threaded stop valve 250; explosion-proof flow switch 260; flow meter 270; positive pressure explosion-proof gas source outlet 271; solenoid valve 280; explosion-proof electrical control system 300; fixing plate 301; working indicator light 310; power indicator light 320; lower pressure limit alarm indicator light 330; ventilation indicator light 340; upper pressure limit alarm indicator light 350; system stop button 360; system start button 370; cable interface 380; grounding terminal 390. DETAILED DESCRIPTION

[0033] To make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the following will be combined with the appended drawings of the embodiments of the present invention. Figure 1-5 , clearly and completely describing the technical solutions of the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the described embodiments of the present invention, all other embodiments derived by ordinary technicians in this field fall within the scope of protection of the present invention.

[0034] like Figure 1-5 Shown: An explosion-proof projection display system includes an explosion-proof projector body, a positive pressure air circuit system and an explosion-proof electrical control system. The explosion-proof projector body adopts a sealed structure. The positive pressure air circuit system is used to provide positive pressure purge and positive pressure maintenance to the explosion-proof projector body. The explosion-proof electrical control system is used to control the working state of the positive pressure air circuit system and the opening and closing of the explosion-proof projector body.

[0035] Specifically, if Figure 1 As shown, an explosion-proof projection display system includes an explosion-proof projector body 100, a positive pressure air circuit system 200 and an explosion-proof electrical control system 300. The explosion-proof projector body 100 adopts a sealed structure. The positive pressure air circuit system 200 is used to provide positive pressure purge and positive pressure maintenance to the explosion-proof projector body 100. The explosion-proof electrical control system 300 is used to control the working state of the positive pressure air circuit system 200 and the opening and closing of the explosion-proof projector body 100.

[0036] According to one embodiment of the present invention, Figure 2 and Figure 1As shown, the explosion-proof projector body 100 includes a projector body 110, an air intake pressure buffer box 120 and an exhaust pressure buffer box 130. The outer shell of the projector body 110 is airtight, and the air intake pressure buffer box 120 and the exhaust pressure buffer box 130 are respectively connected and arranged on both sides of the outer shell of the projector body 110; the positive pressure air source inlet 121 of the air intake pressure buffer box 120 is connected to the positive pressure explosion-proof air source outlet 271 of the positive pressure air circuit system 200 through a pipeline, and the exhaust pressure buffer box 130 is installed with an exhaust valve 131.

[0037] In this embodiment, the explosion-proof projection display system is composed of three components: the explosion-proof projector body (positive pressure chamber), the explosion-proof electrical control system (positive pressure control system), and the positive pressure air system. These three components can be placed together or separately. Preferably, the explosion-proof projector body (positive pressure chamber), the explosion-proof electrical control system (positive pressure control system), and the positive pressure air system are placed separately and connected by flexible metal pipes and control cables.

[0038] In this embodiment, the explosion-proof projector body 100 is based on the existing projector body 110, with the addition of an intake pressure buffer tank 120 and an exhaust pressure buffer tank 130. The projector body 110 has an airtight housing, and the existing heat dissipation device of the projector body 110 can be retained. The positive pressure gas source inlet 121 of the intake pressure buffer tank 120 is connected to the positive pressure explosion-proof gas source outlet 271 of the positive pressure gas system 200 via a pipeline. An exhaust valve 131 is installed on the exhaust pressure buffer tank 130, and the exhaust valve 131 is installed at the location where a flame arrester is installed. When the pressure inside the housing of the projector body 110 is too high, the exhaust valve 131 can be operated to exhaust the gas. Furthermore, the housing of the projector body 110 is an airtight housing made of steel plate or aluminum alloy. Because it can maintain the pressure of the internal protective gas higher than the pressure of the surrounding explosive gas environment, it can effectively prevent the external explosive gas mixture from entering the housing.

[0039] According to one embodiment of the present invention, Figure 2 As shown, an air intake cooling fan 140 is provided between the air intake pressure buffer box 120 and the projector body 110 .

[0040] In this embodiment, in order to improve the positive pressure purge performance of the positive pressure explosion-proof gas source on the inner cavity of the explosion-proof projector body and the heat dissipation performance of the projector body, an air intake cooling fan 140 is arranged between the air intake pressure buffer box 120 and the projector body 110, and the number of air intake cooling fans 140 is not limited, and can be one or more, and can be arranged in a row.

[0041] According to one embodiment of the present invention, Figure 2As shown, an exhaust cooling fan 150 is provided between the exhaust pressure buffer box 130 and the projector body 110 .

[0042] In this embodiment, in order to further improve the positive pressure purge performance of the positive pressure explosion-proof gas source on the inner cavity of the explosion-proof projector body and the heat dissipation performance of the projector body, an exhaust cooling fan 150 is arranged between the exhaust pressure buffer box 130 and the projector body 110, and the number of the exhaust cooling fans 150 is not limited, and can be one or more, and can be arranged in a row.

[0043] According to one embodiment of the present invention, Figure 2 and Figure 1 As shown, the exhaust pressure buffer box 130 is provided with a pressure detection port 160 and an audio and video signal line installation hole 170. The pressure detection port 160 is connected to the pressure differential switch 210 in the positive pressure air circuit system 200 through a pipeline. The audio and video signal line installation hole 170 is used to install the audio and video signal line of the multimedia monitoring that monitors the explosion-proof projector body 100, and the audio and video signal line is connected to the explosion-proof electrical control system 300.

[0044] According to one embodiment of the present invention, Figure 2 and Figure 1 As shown, the air intake pressure buffer box 120 is provided with a cable installation hole 122 , and the cable installation hole 122 is used to install a control cable for controlling the opening and closing of the explosion-proof projector body 100 , and the control cable is connected to the explosion-proof electrical control system 300 .

[0045] According to one embodiment of the present invention, Figure 4 As shown, the positive pressure gas circuit system 200 includes a pressure differential switch 210 and 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 flow meter 270 connected together in sequence through a pipeline along the flow direction of the positive pressure gas circuit. The inlet of the high-pressure ball valve 220 is connected to the positive pressure explosion-proof gas source inlet 221 through a pipeline, and the outlet of the flow meter 270 is connected to the positive pressure explosion-proof gas source outlet 271 through a pipeline. A solenoid valve 280 is connected in parallel to the throttle valve 240. The solenoid valve 280 is connected to the explosion-proof electrical control system 300 via a solenoid valve control cable. The explosion-proof flow switch 260 is connected to the explosion-proof electrical control system 300 via a flow switch control cable. The gas connection end of the differential pressure switch 210 is connected to the pressure detection port 160 via a pipeline, and the signal end of the differential pressure switch 210 is connected to the explosion-proof electrical control system 300 via a differential pressure switch control cable.

[0046] According to one embodiment of the present invention, the positive-pressure explosion-proof gas source used by the positive-pressure gas circuit system 200 is compressed air.

[0047] In this embodiment, the positive pressure explosion-proof gas source used by the positive pressure gas circuit system 200 is compressed air. Of course, other compressed inert gases can also be used, such as compressed nitrogen, compressed argon, or compressed helium. The positive pressure explosion-proof gas source is decompressed to become pure micro-pressure gas and enters the positive pressure outer shell of the explosion-proof projector. After a period of positive pressure gas purge, the explosive gas in the shell is removed and the positive pressure is maintained, making the inside of the shell a safe place.

[0048] According to one embodiment of the present invention, Figure 3 As shown, the explosion-proof electrical control system 300 includes a working indicator light 310, a power indicator light 320, a lower pressure limit alarm indicator light 330, a ventilation indicator light 340, an upper pressure limit alarm indicator light 350, a system stop button 360, a system start button 370 and a cable interface 380 installed on the control circuit board.

[0049] According to an embodiment of the present invention, an electrical interlock is adopted between the explosion-proof electrical control system 300 and the power supply of the explosion-proof projector body 100 .

[0050] In this embodiment, an electrical interlock is adopted between the explosion-proof electrical control system 300 and the power supply of the explosion-proof projector body 100. Only when the positive pressure shell of the explosion-proof projector body 100 has been purged for a period of time and the pressure inside 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 and the explosion-proof projector body 100 can be operated.

[0051] According to one embodiment of the present invention, Figure 3 As shown, in order to guide the static electricity on the explosion-proof electrical control system 300 to the ground in time and ensure safety, a grounding terminal 390 is provided on the explosion-proof electrical control system 300.

[0052] According to one embodiment of the present invention, Figure 3 As shown, in order to integrate the explosion-proof electrical control system 300 with the explosion-proof projector body 100 or the positive pressure gas system 200 , fixing plates 301 with fixing holes are provided at the four corners of the explosion-proof electrical control system 300 .

[0053] According to another embodiment of the present invention, the explosion-proof method of the explosion-proof projection display system includes the following steps:

[0054] S1. Open the high-pressure ball valve of the positive pressure air system to introduce compressed air into the positive pressure cavity of the explosion-proof projector body;

[0055] S2. Turn on the power of the explosion-proof electrical control system, and the power indicator light will turn on;

[0056] S3. Press the system start button on the explosion-proof electrical control system, the positive pressure gas system will automatically enter the purge state, and the ventilation indicator light will light up;

[0057] S4. After a period of purging, the ventilation indicator light goes out and the working indicator light comes on. At the same time, a signal allowing the user to start is sent to the explosion-proof projector body, and the positive pressure air circuit system is closed-loop controlled to keep the internal pressure of the explosion-proof projector body between 70Pa and 400Pa.

[0058] S5. When a fault occurs in the gas circuit and the pressure in the positive pressure chamber of the explosion-proof projector body is lower than the specified working range of 150Pa or higher than the specified working range of 400Pa, the lower limit alarm indicator light or the upper limit alarm indicator light on the panel will light up, and the system will start to send out an alarm signal to remind the on-duty personnel to handle it; when the pressure in the positive pressure chamber of the explosion-proof projector body is lower than 70Pa, the working indicator light will go out, and the system will immediately and automatically cut off the input power of the explosion-proof projector body to ensure that there is no explosion hazard.

[0059] The working method (or working principle) of the present invention:

[0060] like Figure 5 The figure below shows the positive pressure control logic diagram for the explosion-proof electrical control system. During operation, the high-pressure ball valve of the positive pressure air system is opened to allow compressed air to flow into the positive pressure chamber of the explosion-proof projector. The explosion-proof electrical control system is powered on, and the power indicator illuminates. Pressing the system start button on the explosion-proof electrical control system automatically causes the positive pressure air system to enter a purge state, and the ventilation indicator illuminates. After the purge period, the ventilation indicator turns off, the operating indicator illuminates, and a user-friendly start signal is sent to the explosion-proof projector, at which point the projector begins normal operation.

[0061] During normal operation, the working indicator light 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 to keep the internal pressure of the explosion-proof projector body between 70Pa and 400Pa. When a gas circuit failure occurs and the pressure in the positive pressure chamber of the explosion-proof projector body is lower than the specified working range of 150Pa or higher than the specified working range of 400Pa, the lower limit alarm indicator light or the upper limit alarm indicator light on the panel will light, and the system will start to send out an alarm signal to remind the on-duty personnel to handle it; when the pressure in the positive pressure chamber of the explosion-proof projector body is lower than 70Pa, the working indicator light will go out, and the system will immediately and automatically cut off the input power of the explosion-proof projector body to ensure that there is no explosion hazard.

[0062] When the positive pressure system is restarted, the system will operate according to the above steps again, starting from the purge time.

[0063] In the present invention, unless otherwise clearly specified and limited, for example, it can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, it can be internal communication between two elements or an interaction relationship between two elements. Unless otherwise clearly specified and limited, ordinary technicians in this field can understand the specific meanings of the above terms in the present invention according to specific circumstances.

[0064] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as within the scope of protection of the present invention.

Claims

1. An explosion-proof projection display system, characterized by: The explosion-proof projector 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 to provide positive pressure purge and positive pressure maintenance to the explosion-proof projector body (100), and the explosion-proof electrical control system (300) is used to control the working state of the positive pressure gas circuit system (200) and the opening and closing of the explosion-proof projector body (100); The explosion-proof projector body (100) comprises a projector body (110), an air intake pressure buffer box (120) and an exhaust pressure buffer box (130); the shell of the projector body (110) is airtight; the air intake pressure buffer box (120) and the exhaust pressure buffer box (130) are respectively connected and arranged on both sides of the shell of the projector body (110); the positive pressure gas source inlet (121) of the air intake pressure buffer box (120) is connected to the positive pressure explosion-proof gas source outlet (271) of the positive pressure gas circuit system (200) through a pipeline; and the exhaust pressure buffer box (130) is installed with an exhaust valve (131); The exhaust pressure buffer box (130) is provided with a pressure detection port (160) and an audio / video signal line installation hole (170); the pressure detection port (160) is connected to a pressure differential switch (210) in the positive pressure gas system (200) through a pipeline; the audio / video signal line installation hole (170) is used to install an audio / video signal line for 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); An exhaust cooling fan (150) is provided between the exhaust pressure buffer box (130) and the projector body (110).

2. The explosion-proof projection display system according to claim 1, characterized in that: An air intake cooling fan (140) is provided between the air intake pressure buffer box (120) and the projector body (110).

3. The explosion-proof projection display system according to claim 1, characterized in that: The air intake pressure buffer box (120) is provided with a cable installation hole (122), and the cable installation hole (122) is used to install a control cable for controlling the opening and closing of the explosion-proof projector body (100), and the control cable is connected to the explosion-proof electrical control system (300).

4. The explosion-proof projection display system according to claim 1, wherein: The positive pressure gas circuit system (200) comprises a pressure differential switch (210) and 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 flow meter (270) which are sequentially connected together through a pipeline along the flow direction of the positive pressure gas circuit. The inlet of the high pressure ball valve (220) is connected to the inlet (221) of the positive pressure explosion-proof gas source through a pipeline, and the outlet of the flow meter (270) is connected to the outlet (271) of the positive pressure explosion-proof gas source through a pipeline. A solenoid valve (280) is connected in parallel to the throttle valve (240). The solenoid valve (280) is connected to the explosion-proof electrical control system (300) via a solenoid valve control cable. The explosion-proof flow switch (260) is connected to the explosion-proof electrical control system (300) via a flow switch control cable. The gas connection end of the pressure differential switch (210) is connected to the pressure detection port (160) via a pipeline. The signal end of the pressure differential switch (210) is connected to the explosion-proof electrical control system (300) via a pressure differential switch control cable.

5. The explosion-proof projection display system according to claim 4, characterized in that: The positive pressure explosion-proof gas source used by the positive pressure gas circuit system (200) is compressed air or compressed inert gas.

6. The explosion-proof projection display system according to claim 1, characterized in that: The explosion-proof electrical control system (300) comprises a working indicator light (310), a power indicator light (320), a lower pressure limit alarm indicator light (330), a ventilation indicator light (340), an upper pressure limit alarm indicator light (350), a system stop button (360), a system start button (370), and a cable interface (380) mounted on a control circuit board.

7. The explosion-proof projection display system according to any one of claims 1 to 6, characterized in that: An electrical interlock is adopted between the explosion-proof electrical control system (300) and the power supply of the explosion-proof projector body (100).

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