Flame detector with self-checking function

Abstract

The invention discloses a flame detector with a self-checking function, and belongs to the technical field of flame detection.The flame detector with the self-checking function comprises a shell body and a shell cover fixed to the top of the shell body, a base is fixed to the bottom of the shell body through bolts, and a double-layer circuit board is arranged in the shell body; the double-layer circuit board is fixed to the top of the base, an optical lens is installed in the center of the shell cover, and a reflection device composed of an infrared light-emitting tube and two infrared sensors can be utilized and arranged in the shell body. The system effectively avoids missing detection and false alarm risks caused by factors such as window dust accumulation and ambient light intensity change, and meanwhile, the infrared light-emitting tube regularly sends an infrared signal caused by simulated flame to replace an infrared light source of open fire, so that the automation degree is improved, manual intervention is reduced, the operation is simpler and more convenient during detection, and the detection efficiency is improved. And the safety and the reliability of the fire detector are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of flame detection, and more specifically, to a flame detector with a self-check function. Background Art

[0002] Nowadays, flame detectors play an important role in fire fighting. Since the initial stage of a fire contains ultraviolet and infrared rays of different wavelengths that are invisible to the naked eye, the flame detector can detect the fire in time, effectively prevent the spread of the fire, and reduce the losses caused by the fire.

[0003] A flame detector, also known as a photosensitive fire detector, is used to respond to the light characteristics of a fire. When a substance burns, while generating smoke and releasing heat, it also generates visible or invisible light radiation that does not exist in the atmosphere, which will be detected by the flame detector. Among them, the one that relies on detecting infrared light to achieve the alarm function is called an infrared flame detector.

[0004] Based on the above, the inventor of the present invention found that: due to the limitations of the existing technology level and the influence of environmental factors such as temperature and humidity, the existing flame detectors are prone to malfunctions or false alarms. There are certain defects in the production industry detection methods. For example, the detection may not fully cover all possible fault situations, resulting in the risk of undetected detectors; on-site testing requires a large amount of human and time resources, and at the same time, the inspectors will also be affected by the inspection environment and the safety of the system itself. Therefore, in view of this, the existing structure is studied and improved to provide a flame detector with a self-check function, in order to achieve a more practical value. Summary of the Invention

[0005] 1. Technical Problems to be Solved Aiming at the problems existing in the prior art, the purpose of the present invention is to provide a flame detector with a self-check function. It can use a reflection device composed of an infrared light-emitting diode and two infrared sensors and place it inside the housing body, effectively avoiding the risks of undetected and false alarms caused by factors such as dust accumulation on the window and changes in environmental light intensity. At the same time, the infrared light-emitting diode regularly sends an infrared signal simulating a flame to replace the infrared light source of an open fire, improving its automation degree, reducing manual intervention, making the operation more convenient during detection, and improving the safety and reliability of the fire detector.

[0006] 2. Technical Solutions To solve the above problems, the present invention adopts the following technical solutions.

[0007] A flame detector with a self-checking function includes a housing body and a housing cover fixed to the top of the housing body. The bottom of the housing body is fixed with a base by bolts. A double-layer circuit board is arranged inside the housing body and is fixed to the top of the base. An optical lens is installed at the center position of the housing cover. The double-layer circuit board includes an upper-layer circuit board and a lower-layer circuit board, and the two are electrically connected by wires. A signal lamp, an infrared light-emitting diode, and two infrared sensors are installed on the upper surface of the upper-layer circuit board. The two infrared sensors are symmetrically arranged on both sides of the infrared light-emitting diode.

[0008] Furthermore, the infrared light-emitting diode includes a cylindrical tube fixed to the center position of the top of the upper-layer circuit board. An infrared light-emitting source is embedded inside the cylindrical tube. A reflective baffle is fixedly connected to the top end of the cylindrical tube.

[0009] Furthermore, a light-shielding cover is fixedly connected to the top of the cylindrical tube. The light-shielding cover is a non-conductive light-shielding structure and is made of a rigid material.

[0010] Furthermore, openings are formed on both sides of the light-shielding cover, and the opening directions correspond to the infrared sensors.

[0011] Furthermore, the pins of the signal lamp, the infrared light-emitting diode, and the two infrared sensors are sequentially welded to the corresponding pads on the lower surface of the upper-layer circuit board, and each is spaced 5 millimeters apart.

[0012] Furthermore, the upper-layer circuit board and the lower-layer circuit board are arranged parallel to each other up and down and are fixed above the base by screws.

[0013] Furthermore, an inner mold is arranged inside the housing body, and the inner mold is fixedly connected to the inner side wall of the housing body.

[0014] Furthermore, an external thread is provided on the outer periphery of the upper end of the housing body, and a matching internal thread is provided on the inner side wall of the lower end of the housing cover. The upper end of the housing body and the inner side wall of the lower end of the housing cover are threadedly connected by the cooperation of the external thread and the internal thread.

[0015] Furthermore, an observation hole adapted to the optical lens is formed at the center position of the top of the housing cover. The optical lens is embedded in the observation hole and is fixedly connected to the housing cover by adhesive.

[0016] 3. Beneficial effects Compared with the prior art, the advantages of the present invention are as follows: (1) In this solution, through the setting of an infrared light-emitting diode and with the cooperation of two infrared sensors, the infrared light-emitting diode can regularly send an infrared signal caused by an analog flame, and through a reflective baffle, its signal is directly radiated onto the infrared sensors. Then, the infrared sensors transmit the received signal to a double-layer circuit board for signal processing. In this way, it can replace the infrared light source of an open flame. The automated self-check system reduces manual intervention, has a high degree of automation, makes the operation during detection more convenient, and improves the safety and reliability of the fire detector.

[0017] (2) In this solution, by placing the reflection device composed of an infrared light-emitting diode and two infrared sensors inside the detector housing body and using the optical lens on the housing cover for observation, it effectively avoids the risks of missed detection and false alarms caused by factors such as dust accumulation on the window and changes in ambient light intensity. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic diagram of the overall split structure of the present invention; Figure 2 is a schematic side view structure diagram of the upper circuit board of the present invention; Figure 3 is a schematic top view structure diagram of the upper circuit board of the present invention; Figure 4 is a schematic internal structure diagram of the infrared light-emitting diode of the present invention; Figure 5 is a schematic diagram of the radiation mechanism of the infrared light-emitting diode and the infrared sensor of the present invention.

[0019] Description of the reference numerals in the drawings: 1. Housing body; 2. Housing cover; 3. Base; 4. Double-layer circuit board; 401. Upper circuit board; 402. Lower circuit board; 5. Optical lens; 6. Signal lamp; 7. Infrared light-emitting diode; 701. Cylindrical tube; 702. Infrared light source; 703. Reflective baffle; 704. Light-shielding cover; 705. Opening; 8. Infrared sensor; 9. Inner mold; 10. Observation hole. DETAILED DESCRIPTION OF THE INVENTION

[0020] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention; obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0021] Embodiment: Please refer to Figures 1-5 , a flame detector with a self-checking function, including a housing body 1 and a housing cover 2 fixed on the top of the housing body 1. A base 3 is fixed to the bottom of the housing body 1 by bolts. A double-layer circuit board 4 is arranged inside the housing body 1 and is fixed on the top of the base 3. An optical lens 5 is installed at the center position of the housing cover 2; The double-layer circuit board 4 includes an upper circuit board 401 and a lower circuit board 402, and the two are electrically connected by wires. Among them, the lower circuit board 402 is the main control board and can be used for signal processing. A signal lamp 6, an infrared light-emitting diode 7, and two infrared sensors 8 are installed on the upper surface of the upper circuit board 401. The two infrared sensors 8 are symmetrically arranged on both sides of the infrared light-emitting diode 7. During use, the infrared light-emitting diode 7 can regularly send an infrared signal caused by an analog flame, so that the signal is directly radiated on the infrared sensors 8, which can replace the infrared light source of an open flame. The automated self-checking system reduces manual intervention, makes the operation easier during detection, improves the safety and reliability of the fire detector, and at the same time can effectively avoid the risks of missed detection and false alarms caused by factors such as window dust accumulation and environmental light intensity changes.

[0022] Refer to Figure 4 , the infrared light-emitting diode 7 includes a cylindrical tube 701 fixed at the center position on the top of the upper circuit board 401. An infrared light-emitting source 702 is embedded inside the cylindrical tube 701. The top end of the cylindrical tube 701 is fixedly connected with a reflective baffle 703.

[0023] Refer to Figure 4 , a light-shielding cover 704 is fixedly connected to the top of the cylindrical tube 701. The light-shielding cover 704 is a non-conductive light-shielding structure and is made of a rigid material. The rigid material can be one of plastic or metal. Openings 705 are formed on both sides of the light-shielding cover 704, and the directions of the openings 705 correspond to the infrared sensors 8. During use, the light-shielding cover 704 adopts a non-conductive light-shielding structure and has openings 705 on both sides, aiming to minimize the infrared radiation interference except for the sensors as much as possible and make its signal transmission stable.

[0024] Refer to Figure 2, the pins of the signal lamp 6, the infrared light-emitting diode 7, and the two infrared sensors 8 are successively soldered to the corresponding pads on the lower surface of the upper circuit board 401, and are 5 millimeters apart from each other.

[0025] Refer to Figure 1 , the upper circuit board 401 and the lower circuit board 402 are arranged parallel to each other up and down, and are fixed above the base 3 by screws.

[0026] Refer to Figure 1 , an inner mold 9 is arranged inside the housing body 1, and the inner mold 9 is fixedly connected to the inner side wall of the housing body 1. During use, the setting of the inner mold 9 can play a role in waterproofing and dustproofing, and improve its overall sealing performance.

[0027] Refer to Figure 1 , an external thread is provided on the outer periphery of the upper end of the housing body 1, and a matching internal thread is provided on the inner side wall of the lower end of the shell cover 2. The upper end of the housing body 1 and the inner side wall of the lower end of the shell cover 2 are threadedly connected through the cooperation of the external thread and the internal thread.

[0028] Refer to Figure 1 , an observation hole 10 adapted to the optical lens 5 is provided at the center position of the top of the shell cover 2. The optical lens 5 is embedded in the observation hole 10 and is fixedly connected to the shell cover 2 by adhesive. During use, the installation of the optical lens 5 in the observation hole 10 facilitates the observation of the signal lamp 6 inside the housing body 1.

[0029] Working principle: First, install the signal lamp 6, the infrared light-emitting diode 7, and the two infrared sensors 8 on the upper surface of the upper circuit board 401, and successively solder their respective pins to the corresponding pads on the lower surface of the upper circuit board 401, 5 millimeters apart from each other. At this time, the infrared light-emitting diode 7 is set at the center position of the upper circuit board 401 and is between the two infrared sensors 8. Then, install the double-layer circuit board 4 on the base 3, and then connect and fix the whole to the housing body 1. Finally, install the shell cover 2 on the top of the housing body 1; during use, turn on the power supply, use the infrared light-emitting diode 7 to regularly send an infrared signal caused by an analog flame, and directly irradiate the signal on the infrared sensor 8 through the reflective baffle 703. Then, the infrared sensor 8 transmits the received signal to the double-layer circuit board 4, and the lower circuit board 402 of the double-layer circuit board 4 processes the signal to achieve self-checking. In this way, it can replace the infrared light source of an open flame, and the automatic self-checking system reduces manual intervention, makes the operation easier during detection, improves the safety and reliability of the fire detector, and effectively avoids the risks of missed detection and false alarms caused by factors such as dust accumulation on the window and changes in ambient light intensity.

[0030] Finally, it should be noted that: in the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "vertical", "upper", "lower", "horizontal", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation to the present invention.

[0031] In the description of the present invention, it should also be noted that unless otherwise clearly specified and defined, the terms "set", "installed", "connected", "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0032] The above is only the preferred specific embodiment of the present invention; however, the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution of the present invention and its improved concept, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. A flame detector with a self-checking function, comprising a housing body (1) and a housing cover (2) fixed to the top of the housing body (1), wherein a base (3) is fixed to the bottom of the housing body (1) by bolts, and characterized in that: A double-layer circuit board (4) is arranged inside the shell body (1), and the double-layer circuit board (4) is fixed to the top of the base (3); an optical lens (5) is installed at the center of the shell cover (2); The double-layer circuit board (4) comprises an upper circuit board (401) and a lower circuit board (402), and the two are electrically connected via a wire; a signal light (6), an infrared light-emitting tube (7) and two infrared sensors (8) are mounted on the upper surface of the upper circuit board (401); the two infrared sensors (8) are symmetrically arranged on both sides of the infrared light-emitting tube (7).

2. A flame detector with self-checking function according to claim 1, characterized in that: The infrared light-emitting tube (7) comprises a cylindrical tube (701) fixed at the top center position of the upper circuit board (401), an infrared light source (702) is embedded in the cylindrical tube (701), and a reflective baffle (703) is fixedly connected to the top of the cylindrical tube (701).

3. A flame detector with self-checking function according to claim 2, characterized in that: A light shield (704) is fixedly connected to the top of the cylindrical tube (701); the light shield (704) is a non-conductive light shielding structure and is made of a rigid material.

4. A flame detector with self-checking function according to claim 3, characterized in that: Openings (705) are provided on both sides of the light shield (704), and the direction of the openings (705) corresponds to the infrared sensor (8).

5. The flame detector with self-checking function according to claim 1, characterized in that: The pins of the signal light (6), the infrared light-emitting tube (7) and the two infrared sensors (8) are soldered to corresponding solder pads on the lower surface of the upper circuit board (401) in sequence, and are 5 mm apart from each other.

6. The flame detector with self-checking function according to claim 1, characterized in that: The upper circuit board (401) and the lower circuit board (402) are arranged in parallel up and down, and are fixed above the base (3) by means of screws.

7. The flame detector with self-checking function according to claim 1, characterized in that: An inner mold (9) is arranged inside the outer shell body (1), and the inner mold (9) is fixedly connected to the inner side wall of the outer shell body (1).

8. The flame detector with self-checking function according to claim 1, characterized in that: The outer periphery of the upper end of the shell body (1) is provided with an external thread, and the inner wall of the lower end of the shell cover (2) is provided with a matching internal thread. The upper end of the shell body (1) and the inner wall of the lower end of the shell cover (2) are threadedly connected via the matching external thread and internal thread.

9. The flame detector with self-checking function according to claim 1, characterized in that: An observation hole (10) adapted to the optical lens (5) is provided at the center of the top of the shell cover (2); the optical lens (5) is embedded in the observation hole (10) and fixedly connected to the shell cover (2) by using adhesive.

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