Red and ultraviolet composite flame detector

Abstract

The utility model relates to the field of flame detectors, and discloses a red-ultraviolet composite flame detector, including a metal shell front cover, a metal shell middle cavity, a metal shell back cover, a fixed block fixed to the outer surface of the two ends of the metal shell middle cavity; a slide groove one, opened on the inner surface of the metal shell front cover and the metal shell back cover; a slide groove two, located in the middle of the inner wall of the metal shell front cover and the metal shell back cover; a movable block, installed inside the slide groove two; a rubber sealing ring, the outer surface of which fits the inner wall of the slide groove two. The utility model installs the metal shell front cover and the metal shell back cover at the two ends of the metal shell middle cavity, so that the metal shell achieves a sealing effect, and is convenient for the disassembly and assembly of the metal shell. The metal enclosed structure design has an IP65 protection level and a certain explosion-proof performance. The use of a metal shell can not only play a certain electromagnetic radiation isolation role, but also prolong the service life of the detection element and the control mainboard.

Description

Technical Field

[0001] The utility model relates to the technical field of flame detectors, in particular to a red-ultraviolet composite flame detector. Background Art

[0002] The flame detector is an important device in the boiler furnace safety monitoring system. Its function is to conduct real-time detection of the combustion conditions based on the combustion characteristics of the flame. Once the flame combustion state does not meet normal conditions or is extinguished, a signal is given in a certain way to ensure that the fuel supply is stopped when the boiler is extinguished.

[0003] When the flame detector with a single detection method currently on the market is in use, a lot of ash will be produced during the burning process of the furnace fire. Therefore, during the use of the flame detector, the ash inside the furnace cavity is easy to enter the flame detector, which will have a certain impact on the detection accuracy or service life of the flame detector. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides an infrared and ultraviolet composite flame detector, which solves the problems mentioned in the above background.

[0005] The utility model provides the following technical solutions:

[0006] The utility model discloses a red-ultraviolet composite flame detector, comprising a metal shell front cover, a metal shell middle cavity, and a metal shell back cover. The assembly of the metal shell front cover is installed at the front end of the metal shell middle cavity, and the metal shell back cover is installed at the rear end of the metal shell middle cavity.

[0007] A fixing block is fixed to the outer surfaces of both ends of the cavity of the metal shell;

[0008] A first slide groove is provided on the inner surface of the front cover of the metal shell and the inner surface of the rear cover of the metal shell;

[0009] The second slide groove is located between the inner walls of the front cover of the metal shell and the rear cover of the metal shell, and is connected with the first slide groove;

[0010] A movable block is installed inside the second slideway;

[0011] The outer surface of the rubber sealing ring fits the inner wall of the second slideway, and a movable block is sleeved inside.

[0012] Furthermore, a stainless steel observation hole joint is installed in the window of the front cover of the metal shell and is locked by a sealing ring and a metal pressing block. A metal cooling air duct is installed in the front threaded interface of the stainless steel observation hole joint. JGS3 glass is fixed in the card slot of the stainless steel observation hole joint by a sealing ring and a metal pressing block.

[0013] Furthermore, the front end of the central cavity of the metal shell is fixed with an infrared and ultraviolet signal main board via studs.

[0014] Furthermore, a power terminal board (power terminal board) is fixed to the rear end of the cavity in the metal shell through studs.

[0015] Furthermore, ultraviolet tubes and infrared tubes are welded on the welding pad holes corresponding to the red and ultraviolet signal main board.

[0016] Furthermore, the power terminal board is fixed to the ARM single-chip computer mainboard via studs and is electrically connected via flat cables.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] 1. The utility model installs the front cover and the rear cover of the metal shell at both ends of the middle cavity of the metal shell, and slides the fixed block inside the second slide groove to make the metal shell achieve a sealing effect, which is convenient for the disassembly and assembly of the metal shell. The metal closed structure design has an IP65 protection level and a certain explosion-proof performance. The use of the metal shell can not only play a certain electromagnetic radiation isolation role, but also prolong the service life of the detection element and the control mainboard.

[0019] 2. The utility model adopts a circuit design with EMC performance, which can reduce false alarms caused by power frequency interference; a metal cooling duct is set at one end of the observation window, which can reduce the working environment temperature of the detection device and the control mainboard, and reduce the signal drift of the infrared probe caused by high temperature, thereby greatly improving its detection accuracy and reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a three-dimensional structural diagram of the utility model;

[0021] Figure 2 It is a three-dimensional structural cross-sectional view of the utility model;

[0022] Figure 3 This is an exploded view of the metal housing assembly in the utility model;

[0023] The numbers in the figure represent: 1. Metal shell front cover; 2. Stainless steel observation hole joint; 3. Metal cooling air duct; 4. JGS3 glass; 5. Metal shell middle cavity; 6. Metal shell back cover; 7. Ultraviolet tube; 8. Infrared tube; 9. Red and ultraviolet signal main board; 10. Power terminal board; 11. ARM single-chip computer main board; 12. Fixed block; 13. Slide slot one; 14. Slide slot two; 15. Movable block; 16. Rubber sealing ring. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0025] See also Figure 1-3 , including a metal shell front cover 1, a metal shell middle cavity 5, and a metal shell back cover 6. The assembly of the metal shell front cover 1 is installed at the front end of the metal shell middle cavity 5, and the metal shell back cover 6 is installed at the rear end of the metal shell middle cavity 5. The fixed blocks 12 are fixed to the outer surfaces of the two ends of the metal shell middle cavity 5, and are arranged in an equidistant circular array; the first slide 13 is opened on the inner surface of the metal shell front cover 1 and the metal shell back cover 6, and the position corresponds to the fixed block 12, and the size of the first slide 13 matches the fixed block 12; the second slide 14 is located in the middle of the inner wall of the metal shell front cover 1 and the metal shell back cover 6, and is connected to the first slide 13, and the fixed block 12 can slide into the inside of the second slide 14 through the first slide 13; the movable block 15 is installed in the inside of the second slide 14, and is designed in three sections. The place separated by each section is the placement point of the fixed block 12; the rubber sealing ring 16, the outer surface of which fits the inner wall of the second slide 14, and the movable block 15 is sleeved inside, through the rubber sealing The resistance of the sealing ring 16 can reduce the probability of the movable block 15 moving when the fixed block 12 is not in the second slide groove 14. During assembly, the rubber sealing ring 16 is first placed in the second slide groove 14, and then the movable block 15 is placed in the second slide groove 14 in sequence, and the spacing is adjusted to prevent the fixed block 12 from being stuck when it falls into the second slide groove 14. The end of the metal shell front cover 1 or the metal shell rear cover 6 with the slide groove 13 is aligned with the metal shell middle cavity 5, and the fixed block 12 is aligned with the slide groove 13. Position, push the fixed block 12 into the inside of the slide groove 13, and when the fixed block 12 reaches the bottom of the slide groove 13 and comes to the second slide groove 14, rotate the metal shell cavity 5 and slide in the second slide groove 14. When the fixed block 12 slides, it will push the movable block 15 to move. When the fixed block 12 moves a certain distance and is in the middle of the second slide groove 14, the movable block 15 will block the bottom of the slide groove 13, reducing the probability that the fixed block 12 rotates after being accidentally touched and slides out of the slide groove 13.

[0026] A stainless steel observation hole joint 2 is installed in the window of the front cover 1 of the metal shell and is locked by a sealing ring and a metal pressing block. A metal cooling air duct 3 is installed in the front end threaded interface of the stainless steel observation hole joint 2. A JGS3 glass 4 is fixed in the card groove of the stainless steel observation hole joint 2 by a sealing ring and a metal pressing block. The cooperation of the sealing ring and the metal pressing block makes the assembled metal shell have protective performance and explosion-proof performance.

[0027] The front end of the metal shell cavity 5 is fixed with a red-ultraviolet signal main board 9 through a stud, and the red-ultraviolet signal main board 9 corresponds to the pad hole welded with an ultraviolet tube 7 and an infrared tube 8. The ultraviolet tube 7 is mainly used to detect the ultraviolet spectrum of the flame, with a spectrum range of 160 to 285nm and a working voltage of 325±25v; the infrared tube 8 is mainly used to detect the infrared spectrum emitted by the flame, with a spectrum range of 4.35±0.15um and a working voltage of DC5V; through the logic algorithm of the single-chip microcomputer, the signals of the ultraviolet tube 7 and the infrared tube 8 are identified and analyzed, and can be used for flame detection under different working conditions. The main function of the red-ultraviolet signal main board 9 is to drive the ultraviolet tube 7 and the infrared tube 8 to work, identify and process signals, convert the ultraviolet spectrum of the flame into a pulse signal, and convert the infrared spectrum into a voltage signal for the single-chip microcomputer to calculate and analyze.

[0028] The rear end of the metal shell cavity 5 is fixed with a power terminal board 10 through a stud, and the power terminal board 10 is fixed with an ARM single-chip computer mainboard 11 through a stud, and is electrically connected through a flat cable. The power terminal board 10 provides power for the red-ultraviolet signal mainboard 9 and the ARM single-chip computer mainboard 11, and controls the action of the ignition relay and the fault relay; the ARM single-chip computer mainboard 11 has a built-in power indicator light, a ignition indicator light, an ARM core 32-bit single-chip computer, a C program and algorithm, a display screen, and buttons, which can analyze the ultraviolet signal and infrared of the flame in real time, identify and determine according to the core algorithm independently developed, control the lighting of the ignition indicator light and the action of the relay, display the flame intensity in real time, and set the working parameters of the detector through buttons. Through the above scheme, the red-ultraviolet composite flame detector can meet the application needs of different places.

[0029] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A red-ultraviolet composite flame detector, comprising a metal housing front cover (1), a metal housing middle cavity (5), and a metal housing rear cover (6), wherein the metal housing front cover (1) is mounted at the front end of the metal housing middle cavity (5), and the metal housing rear cover (6) is mounted at the rear end of the metal housing middle cavity (5). Features: A fixing block (12) is fixed to the outer surfaces of both ends of the cavity (5) of the metal shell; A slide groove (13) is provided on the inner surfaces of the metal housing front cover (1) and the metal housing rear cover (6); The second slide groove (14) is located between the inner walls of the metal housing front cover (1) and the metal housing rear cover (6), and is connected to the first slide groove (13); A movable block (15) is mounted inside the second slide groove (14); The outer surface of the rubber sealing ring (16) is in contact with the inner wall of the second slide groove (14), and the movable block (15) is sleeved inside.

2. The red-ultraviolet composite flame detector according to claim 1, characterized in that: A stainless steel observation hole joint (2) is installed in the window of the front cover (1) of the metal housing and is locked by a sealing ring and a metal pressing block. A metal cooling air duct (3) is installed in the front threaded interface of the stainless steel observation hole joint (2). A JGS3 glass (4) is fixed in the card slot of the stainless steel observation hole joint (2) by a sealing ring and a metal pressing block.

3. The red-ultraviolet composite flame detector according to claim 1, characterized in that: The front end of the metal shell middle cavity (5) is fixed with an infrared and ultraviolet signal main board (9) via a stud.

4. The red-ultraviolet composite flame detector according to claim 1, characterized in that: A power terminal board (10) is fixed to the rear end of the metal shell cavity (5) via studs.

5. The red-ultraviolet composite flame detector according to claim 3, characterized in that: The ultraviolet tube (7) and the infrared tube (8) are welded on the welding pad holes corresponding to the red and ultraviolet signal main board (9).

6. The red-ultraviolet composite flame detector according to claim 1, characterized in that: The power terminal board (10) is fixed with the ARM single chip computer mainboard (11) via studs and is electrically connected via flat cables.

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