CN215411973U

CN215411973U - Flame detector

Info

Publication number: CN215411973U
Application number: CN202121248521.0U
Authority: CN
Inventors: 黄志高
Original assignee: Safe Fire Shanghai Industrial Control Co ltd
Current assignee: Safe Fire Shanghai Industrial Control Co ltd
Priority date: 2021-06-05
Filing date: 2021-06-05
Publication date: 2022-01-04
Anticipated expiration: 2031-06-05

Abstract

A flame detector comprises a combined type flame-proof shell, wherein a flame-proof cavity is formed inside the combined type flame-proof shell, a circuit detection assembly is installed in the flame-proof cavity, a cable access assembly is further embedded in the combined type flame-proof shell, the output end of the cable access assembly is electrically connected with the circuit detection assembly, and the input end of the cable access assembly is electrically connected with an external cable; the combined type flameproof shell is formed by screwing a box cover and a box body through threads, the outer side face of the screwing end of the box cover is provided with first threads, the inner side face of the screwing end of the box body is provided with second threads, the first threads are matched with the second threads, the outer side face of the box cover is provided with an annular limiting bulge protruding outwards, the annular limiting bulge is used for limiting the end face of the box body, a check screw is screwed on the end face of the opening end of the box body, and the outer end of the check screw is abutted to the annular limiting bulge.

Description

Flame detector

Technical Field

The utility model relates to the field of flame combustion detection, in particular to a flame detector.

Background

The flame detector is an important device in a boiler furnace safety monitoring system, and has the functions of detecting the combustion condition in real time according to the combustion characteristics of flame, and giving a signal in a certain mode once the combustion state of the flame does not meet normal conditions or is flamed out, so that the fuel supply is stopped when the boiler extinguishes the fire. It is mainly composed of two parts of probe and signal processor. However, the traditional integrated flame detector has a simple mechanical structure because the shell is made of engineering plastics, cast aluminum and other materials, and cannot meet the requirements of national explosion-proof standards, so that the traditional integrated flame detector is not suitable for flammable and explosive dangerous places. Especially in the operating environment of boilers in the industries of petrifaction, steel, metallurgy and the like, the occurrence probability of explosive gases and dust (such as CO, SO2, various hydrosulfides, coal dust, smoke dust and the like) is high, explosion is very easy to cause once sparks generated by electrical equipment are encountered, at present, electronic components are isolated by an explosion-proof shell and an explosion-proof end cover, but the clamping structure of the explosion-proof shell and the explosion-proof end cover is easy to loosen in the long-term use process, SO that the sealing performance is reduced.

The present invention is an improvement to solve the above problems.

SUMMERY OF THE UTILITY MODEL

It is an object of the present invention to provide a flame detector that solves the above mentioned drawbacks.

The technical scheme adopted by the utility model for solving the technical problem is as follows:

a flame detector, comprising:

the combined type flameproof shell is internally provided with a flameproof cavity, a circuit detection assembly is installed in the flameproof cavity, a cable access assembly is further embedded in the combined type flameproof shell, the output end of the cable access assembly is electrically connected with the circuit detection assembly, and the input end of the cable access assembly is electrically connected with an external cable; the combined type flameproof shell is formed by screwing a box cover and a box body through threads, the outer side face of the screwing end of the box cover is provided with first threads, the inner side face of the screwing end of the box body is provided with second threads, the first threads are matched with the second threads, the outer side face of the box cover is provided with an annular limiting bulge protruding outwards, the annular limiting bulge is used for limiting the end face of the box body, a check screw is screwed on the end face of the opening end of the box body, and the outer end of the check screw is abutted to the annular limiting bulge.

Further, a first mounting groove is formed in the box cover, a first window and a first window pressing plate are embedded in the first mounting groove, a second mounting groove is formed in the box body, a second window and a second window pressing plate are embedded in the second mounting groove, the explosion-proof cavity is located between the first window pressing plate and the second window, the first window is located on the outer side of the first window pressing plate, and the second window is located on the inner side of the second window pressing plate.

Furthermore, a first cushion pad is filled between the first window and the first window pressing plate, and a second cushion pad is filled between the second window and the second window pressing plate.

Furthermore, the first window pressing plate and the second window pressing plate are circular.

Further, the circuit detection subassembly includes through the rear end plate of bolted fixation in the mounting panel in the box body and in locating the lid, be provided with four long pillars that are the rectangle array between mounting panel and the rear end plate and fix through the countersunk bolt, the inboard of mounting panel is fixed with the stub, be fixed with the locating plate on the stub and fix through the screw, the inboard center of mounting panel is fixed with ultraviolet sensor through the UV sensor insulating ring, ultraviolet sensor runs through the locating plate, the inboard of rear end plate is fixed with the pilot lamp, ultraviolet sensor carries out the electricity through the winding displacement with the pilot lamp and is connected.

Furthermore, the other end of the box body screwing end is provided with a mounting flange, and a grounding bolt is screwed on the mounting flange.

Furthermore, the cable access assembly is formed by inserting an explosion-proof cable sealing joint outside the box body, and a first sealing ring is embedded at the inserting position of the explosion-proof cable sealing joint and the box body.

Furthermore, a second sealing ring is arranged at the joint of the box cover and the box body.

The utility model has the advantages that:

according to the flame detector, the box cover and the box body are screwed through the threads, so that the sealing effect of the explosion-proof cavity is better, and the screwed box cover and the screwed box body cannot be screwed out in long-term work through the arrangement of the locknut, so that the sealing property of the explosion-proof cavity is kept for a long time; the detector divides the explosion-proof cavity from the outside through the first window and the second window, so that the explosion-proof cavity is formed without interfering the use of the circuit detection assembly; the detector; the detector is provided with the explosion-proof shell, so that the detector can be suitable for flammable and explosive dangerous places.

Drawings

FIG. 1 is a cross-sectional view of a flame detector in accordance with the present invention;

FIG. 2 is a cross-sectional view of a combined flameproof enclosure in the flame detector;

FIG. 3 is a cross-sectional view of a circuit detection assembly in the flame detector.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present invention, presented in the figures, is not intended to limit the scope of the utility model, as claimed, but is merely representative of selected embodiments of the utility model. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

As shown in fig. 1 to 3, the flame detector provided by the utility model comprises a combined type flameproof housing 1, wherein a flameproof cavity 2 is formed inside the combined type flameproof housing 1, a circuit detection assembly is installed in the flameproof cavity 2, a cable access assembly is further embedded on the combined type flameproof housing 1, the output end of the cable access assembly is electrically connected with the circuit detection assembly, and the input end of the cable access assembly is electrically connected with an external cable; the combined type flameproof housing 1 is formed by screwing a box cover 3 and a box body 4 through threads, the outer side face of the screwed end of the box cover 3 is provided with a first thread, the inner side face of the screwed end of the box body 4 is provided with a second thread, the first thread is matched with the second thread, the outer side face of the box cover 3 is provided with an annular limiting bulge 31 protruding outwards, the annular limiting bulge 31 is used for limiting the end face of the box body 4, a stop screw 5 is screwed on the end face of the opening end of the box body 4, and the outer end of the stop screw 5 is abutted to the annular limiting bulge 31. After the box cover and the box body are connected in a screwed mode, the check screw is rotated outwards, so that a small gap between the first thread and the second thread is tensioned by the force of the check screw, and the first thread and the second thread cannot be loosened easily. Carry on through adopting above-mentioned technical scheme, through lid and the box body that the screw thread connects soon for the sealed effect in explosion-proof chamber is better, through locknut's setting, makes lid and the box body after connecting soon in long-term work, can not outwards screw out, thereby makes the leakproofness in explosion-proof chamber of keeping for a long time.

The utility model is further provided with: set up first mounting groove in the lid 3, embedded first window 6 and the first window clamp plate 7 of being equipped with of first mounting groove, the second mounting groove has been seted up in the box body 4, embedded second window 8 and the second window clamp plate 9 of being equipped with of second mounting groove, explosion-proof chamber 2 is located between first window clamp plate 7 and the second window clamp plate 8, first window 6 is located the outside of first window clamp plate 7, second window 8 is located the inboard of second window clamp plate 9. The first window is made of polycarbonate, and the second window is made of quartz glass. Through adopting above-mentioned technical scheme, cut apart explosion-proof chamber and outside through first window and second window for the use that can not disturb circuit detection subassembly when explosion-proof chamber forms.

The utility model is further provided with: a first buffer pad 10 is filled between the first window 6 and the first window pressing plate 7, and a second buffer pad 11 is filled between the second window 8 and the second window pressing plate 9. The first buffer pad and the second buffer pad are made of asbestos pads. Through adopting above-mentioned technical scheme, through the setting of blotter for first window clamp plate, second window clamp plate can not cause the damage to first window, second window.

The utility model is further provided with: the first window pressing plate 7 and the second window pressing plate 9 are circular. By adopting the technical scheme, the annular structure does not interfere the use of the circuit detection assembly.

The utility model is further provided with: the circuit detection subassembly includes through the bolt fastening mounting panel 12 in box body 4 and locate the rear end plate 13 in the lid 3, be provided with four long pillars 14 that are the rectangle array between mounting panel 12 and the rear end plate 13 and fix through the countersunk head bolt, the inboard of mounting panel 12 is fixed with stub 15, be fixed with locating plate 16 on stub 15 and fix through the screw, the inboard center of mounting panel 12 is fixed with ultraviolet sensor 18 through UV sensor insulating ring 17, ultraviolet sensor 18 runs through locating plate 16, the inboard of rear end plate 13 is fixed with the pilot lamp, ultraviolet sensor 18 carries out the electricity through winding displacement 19 with the pilot lamp and is connected. Through adopting above-mentioned technical scheme, through the setting of circuit detection subassembly for be convenient for carry out real-time detection to the burning operating mode.

The utility model is further provided with: the other end of the screwing end of the box body 4 is provided with an installation flange 41, and the installation flange 41 is screwed with the grounding bolt 20. Through adopting above-mentioned technical scheme, through the setting of mounting flange for this flame detector is convenient for install fixedly.

The utility model is further provided with: the cable access assembly is formed by inserting an explosion-proof cable sealing joint 21 outside the box body 4, and a first sealing ring 22 is embedded at the inserting position of the explosion-proof cable sealing joint 21 and the box body 4. Through adopting above-mentioned technical scheme, through the setting of first sealing washer for promote the sealed effect in explosion-proof chamber.

The utility model is further provided with: and a second sealing ring 23 is arranged at the joint of the box cover 3 and the box body 4. By adopting the technical scheme, the sealing effect in the explosion-proof cavity is better through the arrangement of the second sealing ring.

The working principle of the utility model is as follows:

under general working conditions, the flame detector can be put into operation after being debugged; when the detected FLAME value is smaller than the parameter ACON _ TL value, after FFRT delay, the FLAME detector outputs no fire, the contact is disconnected, and the FLAME indicator lamp in the rear view window of the FLAME detector is turned off; when the detected FLAME value is larger than or equal to the parameter ACON _ TL value, after OTD delay, the FLAME detector outputs a fire contact to be closed, and an FLAME indicator lamp in a rear window of the FLAME detector is lightened; when the detected flame value is less than or equal to Min value, 4-20mA outputs 4mA, when the detected flame value is greater than or equal to Max value, 4-20mA outputs 20mA, when the detected flame value is changed between Min and Max, the 4-20mA outputs are changed between 4 and 20 mA; under some working conditions, the flame detector after debugging may be abnormal after being put into operation, and at the moment, the flame detector can work normally by adjusting the AC Gain and Fc values in the operation parameters; when the operation parameters are adjusted, the flame detector is connected with a computer provided with the Rodin software by an RS485-USB converter; when the target jet combustion port is free of fire, properly reducing the AC Gain value and/or increasing the Fc value to enable the detected AC value to be as smaller as possible than AC ON _ TL, and enabling the flame detector to output no fire; when the target jet combustion port is in fire, properly increasing the AC Gain value and/or decreasing the Fc value, so that the detected AC value is as large as possible greater than AC ON _ TL, and the flame detector outputs the fire; the two steps of adjustment need to be mutually considered, so that under the condition of certain AC Gain and Fc value, when the target flame jet is flameless, the flame detector outputs fireless, and when the target flame jet is fireless, the flame detector outputs fireless.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", "left", "right", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, or orientations or positional relationships that are conventionally placed when the products of the present invention are used, or orientations or positional relationships that are conventionally understood by those skilled in the art, and are used only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the equipment or elements that are referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used merely to distinguish one description from another, and are not to be construed as indicating or implying relative importance. In the description of the present invention, it is also to be noted that, unless otherwise explicitly stated or limited, the terms "disposed" and "connected" are to be interpreted broadly, and for example, "connected" may be a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the connection may be direct or indirect via an intermediate medium, and may be a communication between the two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Claims

1. A flame detector, comprising:

the explosion-proof device comprises a combined type explosion-proof shell (1), wherein an explosion-proof cavity (2) is formed inside the combined type explosion-proof shell (1), a circuit detection assembly is installed in the explosion-proof cavity (2), a cable access assembly is further embedded in the combined type explosion-proof shell (1), the output end of the cable access assembly is electrically connected with the circuit detection assembly, and the input end of the cable access assembly is electrically connected with an external cable; modular flame proof shell (1) is formed by connecting soon through the screw thread between lid (3) and box body (4), the end lateral surface of revolving of lid (3) has first screw thread, box body (4) connect the end medial surface soon and have the second screw thread, first screw thread suits with the second screw thread, the lateral surface of lid (3) has outside convex annular spacing arch (31), annular spacing arch (31) are used for carrying on spacingly to the terminal surface of box body (4), it has locking screw (5) to spin on the terminal surface of box body (4) open end, the outside end and the spacing protruding (31) looks butt of annular of locking screw (5).

2. A flame detector as claimed in claim 1, wherein: set up first mounting groove in lid (3), embedded first window (6) and first window clamp plate (7) of being equipped with of first mounting groove, the second mounting groove has been seted up in box body (4), embedded second window (8) and second window clamp plate (9) of being equipped with of second mounting groove, explosion-proof chamber (2) are located between first window clamp plate (7) and second window (8), first window (6) are located the outside of first window clamp plate (7), second window (8) are located the inboard of second window clamp plate (9).

3. A flame detector as claimed in claim 2, wherein: a first buffer pad (10) is filled between the first window (6) and the first window pressing plate (7), and a second buffer pad (11) is filled between the second window (8) and the second window pressing plate (9).

4. A flame detector as claimed in claim 2, wherein: the first window pressing plate (7) and the second window pressing plate (9) are circular.

5. A flame detector as claimed in claim 2, wherein: the circuit detection subassembly includes mounting panel (12) in box body (4) and locates rear end plate (13) in lid (3) through the bolt fastening, be provided with four long pillars (14) that are the rectangle array between mounting panel (12) and rear end plate (13) and fix through the countersunk head bolt, the inboard of mounting panel (12) is fixed with stub (15), be fixed with locating plate (16) on stub (15) and fix through the screw, the inboard center of mounting panel (12) is fixed with ultraviolet sensor (18) through UV sensor insulating ring (17), ultraviolet sensor (18) run through locating plate (16), the inboard of rear end plate (13) is fixed with the pilot lamp, ultraviolet sensor (18) and pilot lamp carry out the electricity through winding displacement (19) and are connected.

6. A flame detector as claimed in claim 1, wherein: the other end of the screwing end of the box body (4) is provided with an installation flange (41), and the installation flange (41) is screwed with a grounding bolt (20).

7. A flame detector as claimed in claim 1, wherein: the cable access assembly is formed by inserting an explosion-proof cable sealing joint (21) at the outer side of the box body (4), and a first sealing ring (22) is embedded at the inserting position of the explosion-proof cable sealing joint (21) and the box body (4).

8. A flame detector as claimed in claim 1, wherein: and a second sealing ring (23) is arranged at the joint of the box cover (3) and the box body (4).