Fixed combustible gas detection alarm

Abstract

The invention discloses a fixed combustible gas detection alarm, and belongs to the technical field of gas detection, and the fixed combustible gas detection alarm comprises a protective cover, the surface of which is provided with a gas inlet hole, and the interior of which is provided with a sensing module; the display is in communication connection with the sensing module; a pretreatment cavity is formed between the front box and the air inlet hole; electromagnets which are symmetrically arranged are mounted in the mounting sleeve; the filter element is mounted at one end of the front box away from the air inlet through threads; a metal rod is slidably mounted in the mounting sleeve, a brush plate is rotatably mounted on the filter element, when the metal rod moves due to ferromagnetic adsorption of the electromagnet, the brush plate is driven to rotate, the surface of the filter element is automatically cleaned through the brush plate, dust blockage is prevented, and it is ensured that gas entering the sensing module is clean and stable; after the detection is completed, the electromagnet is powered off to release the particles, so that the subsequent gas flow is prevented from being influenced by accumulation.

Description

Technical Field

[0001] The present invention relates to the technical field of gas detection, and in particular to a fixed combustible gas detection alarm. Background Art

[0002] As an important equipment in the field of industrial safety monitoring, combustible gas detection alarms are widely used in flammable and explosive environments such as petroleum, natural gas, chemical industry, metallurgy, and city gas. They are used to detect the concentration of combustible gases in the air in real time, such as methane, hydrogen, carbon monoxide, propane, etc., and issue audible and visual alarms when the gas leakage reaches the dangerous threshold to remind operators to take emergency measures to prevent safety accidents such as fire and explosion.

[0003] Currently, the combustible gas detection alarms on the market are mainly divided into three categories: catalytic combustion type, semiconductor type and infrared optical type. Among them, catalytic combustion type sensors have fast response speed and high sensitivity, but are easily affected by toxic substances such as sulfides and silicates; semiconductor type sensors have low cost and long life, but are greatly affected by environmental temperature and humidity and have poor stability; infrared optical detectors have the advantages of non-contact, anti-poisoning and long life, and are gradually becoming the mainstream choice for high-end applications.

[0004] However, no matter which type of sensing method is adopted, the existing fixed combustible gas detection alarm is usually installed in areas with a lot of dust and poor air circulation in actual applications, such as underground wells, industrial workshops, pipeline wells, etc. Particles, oil, water vapor and other impurities in the outside air can easily enter the detector, causing the filter device to be blocked and the sensor to be contaminated, which in turn leads to distortion of the detection signal, frequent false alarms or missed alarms. Summary of the Invention

[0005] The purpose of the present invention is to solve the problem in the prior art that impurities such as particulate matter, oil, water vapor in the external air can easily enter the detector, causing blockage of the filter device and contamination of the sensor, which in turn leads to distortion of the detection signal, frequent false alarms or missed alarms, and to propose a fixed combustible gas detection alarm.

[0006] In order to achieve the above object, the present invention adopts the following technical solutions:

[0007] A fixed combustible gas detection alarm comprises: a protective cover with an air inlet on its surface and a sensor module arranged inside; a display fixedly mounted on the protective cover and communicatively connected to the sensor module; a front box fixedly mounted in the protective cover to form a pretreatment chamber between the front box and the air inlet; a mounting sleeve fixedly mounted in the front box and having symmetrically arranged electromagnets installed inside for adsorbing ferromagnetic particles; a filter core threadedly mounted on an end of the front box away from the air inlet, wherein a metal rod is slidably mounted in the mounting sleeve, and a brush plate is rotatably mounted on the filter core, and when the metal rod is moved by the magnetic adsorption of the electromagnet, the brush plate is driven to rotate.

[0008] In order to evenly distribute the cleaning force and improve the cleaning efficiency, preferably, the brush plate includes a cross plate rotatably mounted on the filter element, a brush fixedly mounted on the cross plate, and a mounting seat fixedly mounted on the filter element, a pull rod slidably mounted in the mounting seat, a positioning pin fixedly mounted on the pull rod, and a strip groove adapted to the positioning pin is provided on the cross plate; wherein, a first wedge block is fixedly mounted on the end of the pull rod away from the positioning pin, and a second wedge block is fixedly mounted on the metal rod, and the first wedge block abuts against the inclined surface of the second wedge block.

[0009] In order to increase the overall mass of the metal rod and improve the inertial response, a slight vibration is generated during the resetting process of the metal rod, causing the surrounding dust to loosen and fall off, thereby achieving physical dust reduction. Furthermore, a support seat is fixedly installed in the mounting sleeve, and the metal rod is slidably connected to the support seat through an elastic member. A gravity block is fixedly installed on the metal rod, and a flexible pad is fixedly installed on the side of the mounting seat close to the gravity block.

[0010] In order to ensure that when the equipment is vibrated, the first contact electrode and the second contact electrode are instantly contacted, the alarm main circuit is closed, and the current passes through the sound and light alarm, triggering the sound and light alarm to remind the staff to pay attention to the equipment status, further, a vibration ring is slidably installed in the mounting sleeve, the electromagnet is fixedly installed on the vibration ring, the first contact electrode is fixedly installed on the electromagnet, the second contact electrode is fixedly installed in the mounting sleeve, and an sound and light alarm is provided on one side of the protective cover, and the first contact electrode and the second contact electrode are connected in series to the alarm main circuit.

[0011] In order to reset the metal rod, a sliding groove is further provided in the mounting sleeve, a sliding pin is fixedly installed on the vibration ring, and tension springs are fixedly connected between the two ends of the sliding pin and the inner side wall of the sliding groove.

[0012] In order to convert the light intensity change into the gas concentration value, and at the same time provide a reference signal with a reference light source for environmental compensation, preferably, the detection alarm also includes a base, in which an optical detector and an optical component are fixedly installed, and a through hole for the light path to pass through is opened on the protective cover; the optical component includes a measuring light source and a reference light source, and the end of the metal rod away from the electromagnet passes through the filter element and is equipped with a reflector.

[0013] In order to focus light, further, the reflector is a concave mirror.

[0014] In order to allow the reflector surface to pass through the inner wall of the wiping sleeve, any tiny particles attached to it will be wiped off, avoiding attenuation or distortion of the light signal due to contamination. Furthermore, a support rod is fixedly installed in the protective cover, a wiping sleeve is fixedly installed on the support rod, and the metal rod is slidably installed in the wiping sleeve.

[0015] In order to make the device airtight, preferably, the detection alarm further comprises a top cover, a fixing plate is fixedly mounted on the top cover, positioning plates are provided on opposite surfaces of the top cover and the base, and the protective cover is mounted between the symmetrical mounting grooves.

[0016] To facilitate disassembly, an adjustment plate is slidably installed inside the fixed plate, the adjustment plate is fixedly connected to the base, a tooth groove is provided on one side of the adjustment plate, a transmission rod is rotatably installed in the top cover, one end of the transmission rod is fixedly installed with a gear meshing with the tooth groove, and one end of the transmission rod passes through the top cover and is fixedly installed with an adjustment knob.

[0017] Compared with the existing technology, the present invention provides a fixed combustible gas detection alarm with the following beneficial effects:

[0018] 1. This fixed combustible gas detection alarm, the outside air containing combustible gas enters the front box from the air inlet, and enters the pre-treatment chamber before entering the sensor module. When the air flows through the installation sleeve, the electromagnet is energized to absorb the ferromagnetic particles, such as metal dust. When the electromagnet attracts the metal rod, the metal rod slides and drives the brush plate to rotate. The brush plate automatically cleans the surface of the filter element to prevent dust blockage. The gas after preliminary purification continues to pass through the filter element, and the tiny particles are further filtered to ensure that the gas entering the sensor module is clean and stable. The cleaned gas enters the sensor module, and the sensor converts the gas concentration information into an electrical signal and transmits it to the controller or display. After the detection is completed, the electromagnet is de-energized to release the particles to avoid accumulation affecting the subsequent gas flow.

[0019] 2. This fixed combustible gas detection alarm has a vibration ring in its initial position, the first contact electrode and the second contact electrode are not in contact, the main alarm circuit is disconnected, the sound and light alarm does not work, and the electromagnet is periodically energized according to a preset program to drive the cleaning mechanism for self-cleaning. When the equipment is vibrated, the vibration ring slides along the slide groove under the action of inertia, the sliding pin compresses the tension spring, and the vibration ring drives the first contact electrode to move. The first contact electrode and the second contact electrode are instantly in contact, the main alarm circuit is closed, and current passes through the sound and light alarm, triggering the sound and light alarm to remind staff to pay attention to the equipment status. The physical disconnection of the contact electrode is used to judge the vibration intensity, with rapid response and high reliability.

[0020] 3. For this fixed combustible gas detection alarm, the control system starts the cleaning program, the electromagnet is energized, and the metal rod overcomes the resistance of the elastic part and slides toward the electromagnet. During this process, the surface of the reflector passes through the inner wall of the wiping sleeve, and any tiny particles attached to it will be wiped off. This ensures that the reflector is always in the best working condition and avoids light signal attenuation or distortion caused by contamination. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the overall structure of a fixed combustible gas detection alarm proposed by the present invention;

[0022] Figure 2 This is a schematic diagram of the overall second-view structure of a fixed combustible gas detection alarm proposed by the present invention;

[0023] Figure 3 This is a schematic diagram of the internal structure of a protective cover of a fixed combustible gas detection alarm proposed by the present invention;

[0024] Figure 4 This is a schematic diagram of the internal structure of a front box of a fixed combustible gas detection alarm proposed by the present invention;

[0025] Figure 5 This is a schematic diagram of the internal structure of the front box of a fixed combustible gas detection alarm proposed by the present invention from a second perspective;

[0026] Figure 6 This is a schematic diagram of the internal structure of a mounting base for a fixed combustible gas detection alarm proposed by the present invention;

[0027] Figure 7 This is a schematic diagram of the base structure of a fixed combustible gas detection alarm proposed by the present invention.

[0028] In the figure: 1, protective cover; 101, air inlet; 102, through hole;

[0029] 2. Front box;

[0030] 3. Mounting sleeve; 301. Support seat; 302. Vibration ring; 303. Slide groove; 304. Slide pin; 305. Tension spring; 306. Spring;

[0031] 4. Electromagnet; 5. Filter element;

[0032] 6. Metal rod; 601. Second wedge block; 602. Gravity block; 603. Reflector;

[0033] 7. Brush plate; 701. Cross plate; 702. Brush; 703. Mounting seat; 704. Pull rod; 705. Positioning pin; 706. Strip groove; 707. First wedge block; 708. Flexible pad;

[0034] 8. Adjustment knob;

[0035] 9. Display; 10. First contact electrode; 11. Second contact electrode; 12. Sound and light alarm; 13. Base; 14. Optical detector;

[0036] 15. Optical components; 1501. Measurement light source; 1502. Reference light source;

[0037] 16. Support rod; 17. Wiping sleeve; 18. Top cover; 19. Fixing plate; 20. Positioning plate; 21. Adjusting plate; 2101. Tooth groove; 22. Transmission rod; 23. Gear. DETAILED DESCRIPTION

[0038] The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments.

[0039] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are 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 direction, be constructed and operated in a specific direction, and therefore should not be understood as limiting the present invention.

[0040] Example 1

[0041] Reference Figure 1-Figure 7 A fixed combustible gas detection alarm includes a protective cover 1 with an air inlet 101 on the surface to facilitate the entry of external gas into the detection area. A sensor module is provided inside the protective cover. The sensor module usually adopts a catalytic combustion type or semiconductor type gas sensor, which is suitable for detecting common combustible gases such as methane, hydrogen, and propane. A display 9 is fixedly installed on the protective cover 1 and is in communication with the sensor module.2 C, RS485 and other communication protocols, real-time display of the detected combustible gas concentration value, and can be set to have an LED or LCD display; the front box 2 is fixedly installed in the protective cover 1, and a pre-treatment chamber is formed between it and the air inlet 101 to prevent impurities from directly entering the sensitive component; the installation sleeve 3 is fixedly installed in the front box 2, and a symmetrically arranged electromagnet 4 is installed inside to absorb ferromagnetic particles in the air; the filter element 5 is threadedly installed at the end of the front box 2 away from the air inlet 101 to remove tiny particles.

[0042] Specifically, a metal rod 6 is slidably installed in the installation sleeve 3, and a brush plate 7 is rotatably installed on the filter core 5. When the metal rod 6 is magnetically attracted by the electromagnet 4 and moves, the brush plate 7 is driven to rotate.

[0043] Through the arrangement of the above structure, the external air containing combustible gas enters the front box 2 from the air inlet 101, and enters the pretreatment chamber before entering the sensor module. When the air flows through the mounting sleeve 3, the electromagnet 4 is energized to absorb the ferromagnetic particles therein, such as metal dust. When the electromagnet 4 attracts the metal rod 6, the metal rod 6 slides and drives the brush plate 7 to rotate. The brush plate 7 automatically cleans the surface of the filter element 5 to prevent dust blockage. The gas after preliminary purification continues to pass through the filter element 5, and the tiny particles are further filtered to ensure that the gas entering the sensor module is clean and stable. The cleaned gas enters the sensor module, and the sensor converts the gas concentration information into an electrical signal and transmits it to the controller or display 9. After the detection is completed, the electromagnet 4 is powered off to release the particles to avoid accumulation affecting the subsequent gas flow.

[0044] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings.

[0045] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features and technical solutions therein may be combined with each other.

[0046] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0047] Reference Figure 4-Figure 6The brush plate 7 includes a cross plate 701 rotatably mounted on the filter element 5, a brush 702 is fixedly mounted on the cross plate 701, and the brush 702 is arranged along the outer edge of each extension arm of the cross plate 701 to evenly distribute the cleaning force and improve the cleaning efficiency, and a mounting seat 703 fixedly mounted on the filter element 5, a pull rod 704 is slidably mounted in the mounting seat 703, a positioning pin 705 is fixedly mounted on the pull rod 704, and a strip groove 706 adapted to the positioning pin 705 is provided on the cross plate 701, and the pull rod 704 can slide back and forth in the channel to realize motion guidance and limit control; wherein, a first wedge block 707 is fixedly mounted on the end of the pull rod 704 away from the positioning pin 705, and a second wedge block 601 is fixedly mounted on the metal rod 6, and the first wedge block 707 abuts against the inclined surface of the second wedge block 601.

[0048] Through the arrangement of the above structure, when the electromagnet 4 is energized, a magnetic field is generated to attract the metal rod 6, and the metal rod 6 slides toward the electromagnet 4. As the metal rod 6 moves, the second wedge block 601 on it is pushed forward, and the inclined surface of the second wedge block 601 contacts the first wedge block 707 and applies a thrust. After the first wedge block 707 is thrust, the pull rod 704 is driven to move along the slide in the mounting seat 703, and the pull rod 704 drives the positioning pin 705 to slide in the strip groove 706 of the cross plate 701. During the sliding process of the positioning pin 705 in the strip groove 706, the cross plate 701 is driven to rotate around the rotating axis, and the brush 702 rotates synchronously with the cross plate 701 to clean the dust on the surface of the filter element 5. The electromagnet 4 is de-energized, and the metal rod 6 returns to its position under the action of the elastic element. The first wedge block 707 is separated from the second wedge block 601, the pull rod 704 slides in the opposite direction, the positioning pin 705 returns to its initial position, and the cross plate 701 stops rotating, completing a cleaning cycle.

[0049] Reference Figure 4-Figure 6 A support seat 301 is fixedly installed in the mounting sleeve 3, and the interior is a hollow guide cavity. The metal rod 6 is slidably connected to the support seat 301 through an elastic member, and provides a linear motion guide for the metal rod 6. The elastic member is preferably a spring 306, which pushes the metal rod 6 to rebound and reset after the electromagnet 4 is powered off. A gravity block 602 is fixedly installed on the metal rod 6 to increase the overall mass of the metal rod 6 and improve the inertial response. During the resetting process of the metal rod 6, slight vibration is generated, which drives the surrounding dust to loosen and fall off, thereby achieving physical dust reduction. A flexible pad 708 is fixedly installed on the side of the mounting seat 703 close to the gravity block 602 to absorb the impact force generated by the collision when the metal rod 6 is reset and reduce mechanical noise.

[0050] Through the arrangement of the above structure, the electromagnet 4 is energized, the electromagnetic field attracts the metal rod 6 to slide, compresses the spring 306, and the second wedge block 601 moves with the metal rod 6, pushing the first wedge block 707, the linkage pull rod 704, and the positioning pin 705 to drive the cross plate 701 to rotate, and the brush 702 cleans the dust on the surface of the filter element 5. The electromagnet 4 is de-energized, the magnetic field disappears, and the spring 306 releases energy, pushing the metal rod 6 to reset in the opposite direction. Due to its large mass, the gravity block 602 generates inertial impact during the reset process. The end of the metal rod 6 hits the flexible pad 708, causing local vibration. The vibration is transmitted to the filter element 5 and the front box 2 area, loosening and falling off the firmly attached dust, loosening the suspended particles in the air and the settled fine dust, making it easier to be carried away by the airflow or fall into the dust collecting area at the bottom, realizing the complete cycle of "electromagnetic adsorption → linkage cleaning → reset vibration → auxiliary dust reduction".

[0051] Example 2

[0052] Reference Figure 4-Figure 6 A vibration ring 302 is slidably installed in the mounting sleeve 3, the electromagnet 4 is fixedly installed on the vibration ring 302, the first contact electrode 10 is fixedly installed on the electromagnet 4, and the second contact electrode 11 is fixedly installed in the mounting sleeve 3. An audible and visual alarm 12 is provided on one side of the protective cover 1, and the first contact electrode 10 and the second contact electrode 11 are connected in series to the alarm main circuit.

[0053] Furthermore, a sliding groove 303 is defined in the mounting sleeve 3 , a sliding pin 304 is fixedly mounted on the vibration ring 302 , and tension springs 305 are fixedly connected between the two ends of the sliding pin 304 and the inner sidewall of the sliding groove 303 .

[0054] Through the setting of the above structure, the vibration ring 302 is in the initial position, the first contact electrode 10 is not in contact with the second contact electrode 11, the alarm main circuit is in the disconnected state, the sound and light alarm 12 does not work, and the electromagnet 4 is periodically energized according to the preset program to drive the cleaning mechanism for self-cleaning. When the equipment is vibrated, the vibration ring 302 slides along the slide groove 303 under the action of inertia, the sliding pin 304 compresses the tension spring 305, and the vibration ring 302 drives the first contact electrode 10 to move. The first contact electrode 10 is instantly in contact with the second contact electrode 11, the alarm main circuit is closed, and the current passes through the sound and light alarm 12, triggering the sound and light alarm to remind the staff to pay attention to the equipment status. The physical contact electrode disconnection is used to judge the vibration intensity, and the response is fast and the reliability is high.

[0055] Example 3

[0056] Reference Figure 4 、 Figure 5 and Figure 7The detection alarm also includes a base 13, in which an optical detector 14 and an optical component 15 are fixedly installed. A through hole 102 for the light path to pass through is opened on the protective cover 1; the optical component 15 includes a measuring light source 1501 and a reference light source 1502, and the end of the metal rod 6 away from the electromagnet 4 passes through the filter element 5 and is installed with a reflector 603. Preferably, the reflector 603 is a concave mirror.

[0057] Through the above-mentioned structural setting, the measuring light source 1501 emits a light beam of a specific wavelength, which passes through the through hole 102. The light beam is reflected by the concave reflector 603 and returns to the optical detector 14. If the air contains combustible gases, such as CH4, part of the light is absorbed, resulting in a decrease in the intensity of the returned light. The optical detector 14 converts the change in light intensity into a gas concentration value, and at the same time provides a reference signal with reference to the light source 1502 for environmental compensation.

[0058] Reference Figure 4-Figure 5 A support rod 16 is fixedly installed in the protective cover 1, a wiping sleeve 17 is fixedly installed on the support rod 16, and the metal rod 6 is slidably installed in the wiping sleeve 17.

[0059] Through the setting of the above structure, the control system starts the cleaning program, the electromagnet 4 is energized, and the metal rod 6 overcomes the resistance of the elastic part and slides toward the electromagnet 4. During this process, the surface of the reflector 603 passes through the inner wall of the wiping sleeve 17, and any tiny particles attached thereto will be wiped off. This ensures that the reflector 603 is always in the best working condition and avoids attenuation or distortion of the optical signal due to contamination.

[0060] Example 4

[0061] Reference Figure 1-Figure 2 and Figure 7 The detection alarm also includes a top cover 18 , on which a fixing plate 19 is fixedly mounted. Positioning plates 20 are provided on opposite surfaces of the top cover 18 and the base 13 , and the protective cover 1 is installed between the symmetrical positioning plates 20 .

[0062] An adjustment plate 21 is slidably installed inside the fixed plate 19, and the adjustment plate 21 is fixedly connected to the base 13. A tooth groove 2101 is provided on one side of the adjustment plate 21. A transmission rod 22 is rotatably installed in the top cover 18, and one end of the transmission rod 22 is fixedly installed with a gear 23 that meshes with the tooth groove 2101. One end of the transmission rod 22 passes through the top cover 18 and is fixedly installed with an adjustment knob 8.

[0063] Through the setting of the above structure, the detection alarm is placed in the target installation position, and the protective cover 1 is clamped between the top cover 18 and the positioning plate 20 symmetrical to the base 13 to form a stable structure. By rotating the adjustment knob 8, the transmission rod 22 is driven to rotate, and the gear 23 engages with the tooth groove 2101 to drive the adjustment plate 21 to move upward or downward to achieve locking. The modular clamping structure is adopted to facilitate quick disassembly.

[0064] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A fixed combustible gas detection alarm, characterized in that: include: The protective cover (1) has an air inlet (101) on its surface and a sensor module disposed therein; A display (9) is fixedly mounted on the protective cover (1) and is in communication connection with the sensor module; A front box (2) is fixedly installed in the protective cover (1) and forms a pre-processing chamber between the front box and the air inlet (101); A mounting sleeve (3) is fixedly mounted in the front box (2), and has symmetrically arranged electromagnets (4) mounted therein for adsorbing ferromagnetic particles; The filter element (5) is threadedly mounted on the end of the front box (2) away from the air inlet (101). A metal rod (6) is slidably mounted in the mounting sleeve (3), and a brush plate (7) is rotatably mounted on the filter core (5). When the metal rod (6) is magnetically attracted by the electromagnet (4) and moves, the brush plate (7) is driven to rotate.

2. A fixed combustible gas detection alarm according to claim 1, characterized in that: The brush plate (7) comprises a cross plate (701) rotatably mounted on the filter element (5), a brush (702) being fixedly mounted on the cross plate (701), and A mounting seat (703) is fixedly mounted on the filter element (5), a pull rod (704) is slidably mounted in the mounting seat (703), a positioning pin (705) is fixedly mounted on the pull rod (704), and a strip groove (706) adapted to the positioning pin (705) is provided on the cross plate (701). A first wedge block (707) is fixedly mounted on one end of the pull rod (704) away from the positioning pin (705), and a second wedge block (601) is fixedly mounted on the metal rod (6), and the first wedge block (707) and the second wedge block (601) are in contact with each other at an inclined surface.

3. A fixed combustible gas detection alarm according to claim 2, characterized in that: A support seat (301) is fixedly installed in the installation sleeve (3), the metal rod (6) is slidably connected to the support seat (301) via an elastic member, a gravity block (602) is fixedly installed on the metal rod (6), and a flexible pad (708) is fixedly installed on a side of the installation seat (703) close to the gravity block (602).

4. A fixed combustible gas detection alarm according to claim 3, characterized in that: A vibration ring (302) is slidably mounted in the mounting sleeve (3), the electromagnet (4) is fixedly mounted on the vibration ring (302), a first contact electrode (10) is fixedly mounted on the electromagnet (4), a second contact electrode (11) is fixedly mounted in the mounting sleeve (3), an audible and visual alarm (12) is provided on one side of the protective cover (1), and the first contact electrode (10) and the second contact electrode (11) are connected in series to an alarm main circuit.

5. A fixed combustible gas detection alarm according to claim 4, characterized in that: A sliding groove (303) is provided in the installation sleeve (3), a sliding pin (304) is fixedly installed on the vibration ring (302), and a tension spring (305) is fixedly connected between the two ends of the sliding pin (304) and the inner side wall of the sliding groove (303).

6. A fixed combustible gas detection alarm according to claim 1, characterized in that: The detection alarm further comprises a base (13), an optical detector (14) and an optical component (15) are fixedly mounted in the base (13), and a through hole (102) for a light path to pass through is provided on the protective cover (1); The optical assembly (15) includes a measuring light source (1501) and a reference light source (1502). The end of the metal rod (6) away from the electromagnet (4) passes through the filter core (5) and is equipped with a reflector (603).

7. A fixed combustible gas detection alarm according to claim 6, characterized in that: The reflecting mirror (603) is a concave mirror.

8. A fixed combustible gas detection alarm according to claim 7, characterized in that: A support rod (16) is fixedly installed in the protective cover (1), a wiping sleeve (17) is fixedly installed on the support rod (16), and the metal rod (6) is slidably installed in the wiping sleeve (17).

9. A fixed combustible gas detection alarm according to claim 6, characterized in that: The detection alarm further comprises a top cover (18), a fixing plate (19) being fixedly mounted on the top cover (18), positioning plates (20) being provided on opposite surfaces of the top cover (18) and the base (13), and the protective cover (1) being mounted symmetrically between the positioning plates (20).

10. A fixed combustible gas detection alarm according to claim 9, characterized in that: An adjusting plate (21) is slidably mounted inside the fixing plate (19), the adjusting plate (21) is fixedly connected to the base (13), a tooth groove (2101) is provided on one side of the adjusting plate (21), a transmission rod (22) is rotatably mounted inside the top cover (18), a gear (23) meshing with the tooth groove (2101) is fixedly mounted on one end of the transmission rod (22), and an adjusting knob (8) is fixedly mounted on one end of the transmission rod (22) passing through the top cover (18).

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