Explosion-proof flame detector

Abstract

The utility model relates to the field of flame detection, in particular to an explosion-proof flame detector, which comprises a convex mirror, a shell, a display cover and window glass, the convex mirror, the shell, the display cover and the window glass form an explosion-proof shell, an explosion-proof cavity is formed in the explosion-proof shell, and four compact PCBs (printed circuit boards) are mounted in the explosion-proof cavity. All parts of the shell are sealed through a sealing ring, a window sealing gasket and a window pressing plate, the shell is provided with an anti-explosion stuffing box for access of a non-armored cable, the mirror base is used for being connected with the explosion-proof type anti-explosion shell, and the flat mirror base is used for installing a flat mirror piece. When the explosion-proof burner is used, the four integrated PCBs are compactly designed according to the ultraviolet and infrared detection principle, so that a compact explosion-proof shell is correspondingly designed, the explosion-proof burner is suitable for severe explosive gas, explosive dust and rainy days, flames in the burner can be reliably detected, and the safety of the burner can be improved.

Description

Technical Field

[0001] The utility model relates to the field of flame detection, in particular to an explosion-proof flame detector. Background Technique

[0002] A burner is a general term for a device that sprays and mixes fuel and air for combustion. Burners are classified into industrial burners, combustion engines, domestic burners, and special burners according to type and application field.

[0003] However, if the burners in various industries cannot burn reliably and stably, it will cause safety accidents such as explosions and environmental protection problems such as incomplete combustion, which are unacceptable to enterprises. Therefore, technicians in this field have provided an explosion-proof flame detector to solve the problems raised in the above background technique. Content of the Utility Model

[0004] To solve the above technical problems, the utility model provides an explosion-proof flame detector, which includes a convex mirror, a housing, a display cover, and a window glass. The convex mirror, housing, display cover, and window glass form an explosion-proof housing of the flameproof type, and an explosion-proof cavity is formed inside. Four compact PCB circuit boards are installed inside the explosion-proof cavity. Seals, window gaskets, and window pressure plates are used to seal between the components of the housing. An explosion-proof stuffing box for non-armored cable access is provided on the housing. The lens holder is used to connect to the explosion-proof housing of the flameproof type, and the flat lens holder is used to install the flat lens.

[0005] Preferably: a UV or IR detection sensor is installed at the front end of the housing, which includes core signal receiving, processing, and converting components.

[0006] Preferably: the connecting piece is reserved with NPT external threads for connecting to external devices such as burners.

[0007] Preferably: the housing and the display cover are fixed by anti-loosening screws.

[0008] Technical Effects and Advantages of the Utility Model:

[0009] By using the UV and IR detection principles, a compact design is carried out for the four integrated PCB circuit boards, and accordingly a compact explosion-proof housing is designed to be applicable to harsh explosive gases, explosive dust, and rainy days, and can reliably detect the flame in the burner, which is beneficial to improving the safety of the burner. Description of the Drawings

[0010] Figure 1 It is a schematic structural diagram provided by this application;

[0011] In the figure: 1. Connecting piece; 5. Flat mirror base; 6. Mirror base; 7. Sealing ring; 8. Shell; 9. Explosion-proof stuffing box; 10. Display cover; 11. Window glass; 12. Window gasket; 13. Window pressing plate; 18. Locking screw; 19. PCB circuit board; 20. Convex lens; 21. Flat lens. Detailed implementation mode

[0012] The present utility model will be further described in detail below in conjunction with the accompanying drawings and the detailed implementation mode. The embodiments of the present utility model are given for the purpose of illustration and description, and are not exhaustive or limited to the disclosed form. Many modifications and variations will be obvious to those of ordinary skill in the art. The embodiments are selected and described to better illustrate the principles and practical applications of the present utility model, and enable those of ordinary skill in the art to understand the present utility model and thus design various embodiments with various modifications suitable for specific purposes.

[0013] Please refer to Figure 1 , in this embodiment, an explosion-proof flame detector is provided, which includes a convex lens (20), a shell (8), a display cover (10), and a window glass (11) to form an explosion-proof enclosure of the flameproof type, and an explosion-proof cavity is formed inside to ensure that the flame detector can be installed and used in harsh environments such as explosive gases, explosive dusts, and rainy days. Four compact PCB circuit boards (19) are installed inside the explosion-proof cavity. An ultraviolet or infrared detection sensor is installed at the front end, which includes core signal receiving, processing, and conversion components. Each component of the shell is sealed by a sealing ring (7), a window gasket (12), and a window pressing plate (13). An explosion-proof stuffing box (9) for non-armored cable access is provided on the shell, so that external cables can be accessed to supply power to the flame detector and transmit the converted 4-20 mA standard industrial signal, and the overall explosion-proof performance of the shell is ensured. The connecting piece (1) is provided with an NPT external thread for connecting to external devices such as burners. The mirror base (6) is used to connect to the explosion-proof enclosure of the flameproof type. The flat mirror base (5) is used to install the flat lens (21), which mainly plays a role in isolating dust and protection. The shell (8) and the display cover (10) are fixed by locking screws (18).

[0014] The working principle of the present utility model is:

[0015] Using the ultraviolet and infrared detection principles, four integrated PCB circuit boards are compactly designed, and accordingly, a compact explosion-proof enclosure is designed to be applicable to harsh explosive gases, explosive dusts, and rainy days, and reliably detect the flame in the burner, which is beneficial to improving the safety of the burner;

[0016] This technology uses ultraviolet and infrared detection technologies for flame detection. During fire detection combustion, both ultraviolet and infrared rays are generated simultaneously. Flame signals are detected through ultraviolet sensors or infrared sensors (depending on the type of fuel, for fuels with strong ultraviolet signals during combustion, ultraviolet sensors can be selected, and for fuels with strong infrared signals during combustion, infrared sensors can be selected). Then, they are converted into electrical signals through amplifiers and optoelectronic converters, and then converted into standard 4-20mA industrial signals through a standard signal conversion module to output the flame intensity. At the same time, it can be converted into a digital signal output through an internal relay output. It is equipped with a power indicator light, a flame signal indicator light, and a flame signal intensity indicator light. It is equipped with high and low gain selection outputs. The self-check electronic circuit can detect faults in the flame detector itself;

[0017] The external structure has a compact housing, which has passed the TUV gas and dust double explosion-proof type certification and is widely applicable to explosive gas and dust hazardous environments. Two materials, stainless steel and cast aluminum, are designed for selection. The cast aluminum housing is coated with anti-corrosion paint to be applicable to corrosive environments. The cable is wired through an explosion-proof type sealed gland. The front section of the housing is equipped with explosion-proof glass to meet the explosion-proof performance and keep the lens clean. The rear cover of the housing is equipped with explosion-proof glass to meet the explosion-proof performance and facilitate observing the power supply and signal status of the flame detector.

[0018] Obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all embodiments. All other embodiments obtained by those of ordinary skill in the art and related fields based on the embodiments in the present utility model without creative efforts shall fall within the protection scope of the present utility model. The structures, devices, and operation methods not specifically described and explained in the present utility model, unless otherwise specified and limited, are implemented according to the conventional means in the art.

Claims

1. An explosion-proof flame detector, comprising a convex lens (20), a housing (8), a display cover (10), and a window glass (11), characterized in that, The convex mirror (20), the housing (8), the display cover (10), and the window glass (11) form an explosion-proof enclosure of the flameproof type, and an explosion-proof cavity is formed inside. Four compact PCB boards (19) are installed inside the explosion-proof cavity. The components of the enclosure are sealed by a sealing ring (7), a window gasket (12), and a window pressing plate (13). An explosion-proof stuffing box (9) for non-armored cable access is provided on the enclosure. The mirror base (6) is used to connect to the explosion-proof enclosure of the flameproof type, and the flat mirror base (5) is used to install the flat lens (21).

2. An explosion-proof flame detector according to claim 1, characterized in that, A UV or IR detection sensor is installed at the front end of the housing (8), which includes the core signal receiving, processing, and converting components.

3. An explosion-proof flame detector according to claim 1, characterized in that, The connecting piece (1) has an NPT external thread reserved for connection to external devices such as burners.

4. An explosion-proof flame detector according to claim 1, characterized in that, The housing (8) and the display cover (10) are fixed by anti-loosening screws (18).

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