Explosion-proof structure shell of gas alarm

Abstract

The utility model relates to the field of gas alarm equipment, and discloses an explosion-proof structure shell of a gas alarm, the explosion-proof structure shell comprises a shell body, the shell body is provided with an alarm circuit cavity used for installing an alarm circuit and a sensor cavity used for installing a gas sensor, and the alarm circuit cavity is communicated with the sensor cavity through a threading hole. The utility model has the effects of reducing the processing cost and improving the product reliability.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of gas alarm devices, in particular to an explosion-proof structure shell of a gas alarm. BACKGROUND

[0002] The explosion-proof gas alarm, especially the fixed gas alarm used in industrial and commercial places, is provided with a gas sensor in the shell, and generally adopts an explosion-proof measure.

[0003] The general gas sensor, such as the common semiconductor sensor, catalytic combustion sensor and electrochemical sensor, has a small volume, and the conventional outer dimensions are Ф10x16, Ф12x10 and Ф20x16 in turn, and even an industry rule is formed, and the outer dimensions of other new sensors also basically adopt the dimensions, so that the compatibility of the sensor shell can be achieved, and no matter what kind of sensor is replaced, the structure shell is uniform.

[0004] However, for some new special technology sensors, the outer dimensions limit the development of the technology, resulting in a high price, which further hinders the use of the product. For example, the longer optical path is more conducive to detecting gas. Due to the limitation of the outer dimensions of the sensor, the technology of back and forth reflection or multiple reflection is adopted to increase the length of the optical path to obtain higher sensitivity and range. Therefore, the installation angle requirement of each mirror surface is extremely strict, the process requirement is extremely high, the production efficiency is low, the yield is low, and the cost is high.

[0005] For example, the current infrared and laser gas sensors have better technical performance than the traditional principle sensors, but the price is generally much higher, which restricts the popularization.

[0006] At present, some sensors have broken through the conventional outer structure, so that the performance is more superior and the cost performance is higher. However, the conventional structure mode is that a metal explosion-proof shell is internally provided with a circuit board, and a sensor is sealed by an independent explosion-proof shell, and the two are connected together by threads. Almost all products on the market adopt this mode, and one explosion-proof cavity can only install one explosion-proof sensor. The product of this structure mode has high cost of the structure part due to the mechanical processing technology of multiple components, and therefore a more reasonable shell structure needs to be matched. CONTENT OF THE INVENTION

[0007] In order to alleviate the problem that the explosion-proof cavity of the shell structure of the current alarm is single and the structural rationality is poor, the present application provides an explosion-proof structure shell of a gas alarm.

[0008] The explosion-proof structure shell of the gas alarm provided by the present application adopts the following technical scheme:

[0009] An explosion-proof structural housing for a gas alarm includes a housing, on which are provided an alarm circuit cavity for installing an alarm circuit and a sensor cavity for installing a gas sensor, the alarm circuit cavity and the sensor cavity being connected through a wiring hole.

[0010] By adopting the above technical solution, the alarm circuit cavity and the sensor cavity are combined into one housing, eliminating the need for their respective machining processes, simplifying assembly, reducing processing costs, and improving product reliability. At the same time, the wire hole ensures that the wires of the sensor circuit in the sensor cavity can smoothly enter the alarm circuit cavity and connect with the alarm circuit.

[0011] Preferably, the threading hole is filled with epoxy resin.

[0012] By adopting the above technical solution, after the wires of the sensor circuit pass through the wire hole, they are sealed with epoxy resin to ensure the isolation between the alarm circuit cavity and the sensor circuit cavity, which meets the explosion-proof requirements.

[0013] Preferably, the wire hole has a tapered structure, and the diameter of the wire hole gradually decreases from the sensor cavity to the alarm circuit cavity, and a groove is formed on the side wall of the wire hole.

[0014] By adopting the above technical solution, the tapered design of the threading hole allows epoxy resin to be poured in from the larger opening, which is convenient for operation. At the same time, the groove design facilitates the flow of the resin and increases resistance after the resin has solidified, preventing the epoxy resin from falling off.

[0015] Preferably, the housing is detachably connected to a first cover for sealing the alarm circuit cavity and a second cover for sealing the sensor cavity, wherein the second cover has at least one air inlet.

[0016] By adopting the above technical solution and utilizing the detachable design of the first and second covers, the alarm can be easily installed and removed.

[0017] Preferably, the facing surfaces of the alarm circuit cavity and the sensor cavity are perpendicular to each other.

[0018] By adopting the above technical solution, when the alarm is installed normally, the alarm circuit cavity faces to the side, and the sensor cavity faces the ground, which can effectively prevent dust and water from entering the sensor cavity.

[0019] Preferably, the first cover has a viewing window, and a glass plate is disposed inside the viewing window.

[0020] By adopting the above technical solution, staff can observe the displayed information through the viewing window during use.

[0021] Preferably, both the first cover and the second cover are provided with sealing rings.

[0022] By adopting the above technical solution and utilizing the sealing ring, the sealing performance between the first cover and the second cover and the shell is ensured after installation.

[0023] Preferably, a dustproof film is adhered to the second cover.

[0024] By adopting the above technical solution, the dustproof film can effectively reduce the amount of dust entering the sensor cavity.

[0025] Preferably, the second cover is provided with a metal wire mesh for sealing the air inlet.

[0026] By adopting the above technical solution, the metal mesh can prevent foreign objects from piercing and avoid damage to the sensor components inside the sensor cavity.

[0027] Preferably, the housing has two inlet ports, both of which are connected to the alarm circuit cavity. The two inlet ports are located on opposite sides of the housing. The housing has at least one outlet port, which is connected to the alarm circuit cavity.

[0028] By adopting the above technical solution, the setting of two incoming interfaces facilitates the connection of incoming and outgoing wiring harnesses in field applications. At the same time, the outgoing port can be used as an output connection antenna, enabling the alarm to have wireless communication capabilities.

[0029] In summary, this application includes at least the following beneficial technical effects:

[0030] 1. By combining the alarm circuit cavity and the sensor cavity into one housing, the separate machining processes are eliminated, simplifying assembly, reducing processing costs, and improving product reliability;

[0031] 2. By filling the wiring hole with epoxy resin, the wires of the sensor circuit pass through the wiring hole and are then sealed with epoxy resin to ensure the isolation between the alarm circuit cavity and the sensor circuit cavity, which meets the explosion-proof requirements.

[0032] 3. By setting a viewing window on the first cover, staff can observe the display information of the alarm circuit through the viewing window. Attached Figure Description

[0033] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of this application;

[0034] Figure 2 This is a schematic diagram of the alarm circuit cavity in Embodiment 1 of this application;

[0035] Figure 3This is a schematic diagram of the wire hole structure in Embodiment 1 of this application;

[0036] Figure 4 This is a schematic diagram of the structure of the first cover in Embodiment 1 of this application;

[0037] Figure 5 This is a schematic diagram of the view window structure in Embodiment 1 of this application;

[0038] Figure 6 This is a schematic diagram of the structure of the second cover in Embodiment 1 of this application;

[0039] Figure 7 This is a schematic diagram of the structure of the dustproof film in Embodiment 1 of this application;

[0040] Figure 8 This is a schematic diagram of the structure of the second cover in Embodiment 2 of this application.

[0041] Reference numerals: 100, housing; 110, alarm circuit cavity; 120, sensor cavity; 130, wiring hole; 140, inlet interface; 150, outlet; 200, first cover; 210, viewing window; 220, glass plate; 230, enclosure; 240, support ring; 250, pressure ring; 260, fixing hole; 300, second cover; 310, air inlet; 320, wire mesh; 330, dustproof film; 340, fixing slot. Detailed Implementation

[0042] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0043] This application discloses an explosion-proof structural housing for a gas alarm.

[0044] Example 1

[0045] Reference Figure 1 and Figure 2 An explosion-proof housing for a gas alarm includes a housing 100, which has a rectangular parallelepiped shape. The housing 100 has an alarm circuit cavity 110 and a sensor cavity 120. The alarm circuit cavity 110 is used to install the alarm circuit, and the sensor cavity 120 is used to install the sensor. A first cover 200 for sealing the alarm circuit cavity 110 and a second cover 300 for sealing the sensor cavity 120 are fixedly connected to the housing 100 by screws.

[0046] To facilitate the installation and fixation of the first cover 200 and the second cover 300, multiple screw holes are provided on both the first cover 200 and the second cover 300. The screw holes on the first cover 200 are spaced apart along the periphery of the first cover 200, and the screw holes on the second cover 300 are spaced apart along the periphery of the second cover 300. Sealing rings are fixedly connected to the inner sides of both the first cover 200 and the second cover 300. The screw holes on the first cover 200 and the second cover 300 are all located on the outer side of their corresponding sealing rings, so that water will not enter the cavity due to leakage from the screw holes.

[0047] Reference Figure 1 and Figure 2 The housing 100 is integrally formed with two wire inlet interfaces 140, which are located on the left and right sides of the housing 100 respectively. Both wire inlet interfaces 140 are connected to the inside of the alarm circuit cavity 110 to facilitate the connection of the wire harness in the field. In this embodiment, the wire inlet interface 140 adopts an M25 thread. In other embodiments, other thread specifications can be adopted to meet the requirements of different field needs.

[0048] Reference Figure 1 and Figure 2 In this embodiment, the housing 100 is integrally formed with two cable outlets 150. The two cable outlets 150 are located on the upper part of the housing 100 near the left and right sides, respectively. Both cable outlets 150 are connected to the inside of the alarm circuit cavity 110. The cable outlets 150 are used as output connection antennas to enable the product to have wireless communication function. The arrangement of two cable outlets 150 in this embodiment can meet the needs of implementation at different angles on site and save on-site materials. In other embodiments, the number of cable outlets 150 is not limited to two, and the position of the cable outlets 150 is not limited to the upper part of the housing 100. They can be set on the periphery of the housing 100 according to actual needs.

[0049] In this embodiment, the cable outlet 150 uses an M20 thread. Similarly, in other embodiments, other thread specifications can be used to meet the requirements of different site conditions.

[0050] Reference Figure 2 and Figure 3The alarm circuit cavity 110 and the sensor cavity 120 are connected by a wire hole 130. The wire hole 130 has a tapered structure, and its diameter gradually decreases from the sensor cavity 120 to the alarm circuit cavity 110. In this embodiment, the cross-section of the wire hole 130 perpendicular to its length direction is rectangular. Grooves are formed on each side wall of the wire hole 130, and epoxy resin is poured into the wire hole 130. Connecting the alarm circuit cavity 110 and the sensor cavity 120 through the wire hole 130 ensures that the wires of the sensor circuit in the sensor cavity 120 can smoothly enter the alarm circuit cavity 110 and connect with the alarm circuit. Then, the wire hole 130 is sealed with epoxy resin, which ensures the isolation between the alarm circuit cavity 110 and the sensor cavity 120, meeting the explosion-proof requirements.

[0051] Reference Figure 4 and Figure 5 The first cover 200 has a viewing window 210 in the middle, and a transparent glass plate 220 is installed inside the viewing window 210, so that staff can observe the displayed information through the glass plate 220.

[0052] A retaining ring 230 is fixedly connected to the periphery of the viewing window 210 to support the positioning glass piece 220. In this example, the retaining ring 230 is integrally formed with the first cover 200. A support ring 240 is fixedly connected inside the viewing window 210, and a pressure ring 250 is threadedly connected inside the viewing window 210. During installation, the glass is placed into the viewing window 210, the support ring 240 supports the glass piece 220, and then the pressure ring 250 is screwed into the viewing window 210 to press and fix the glass piece 220, thus realizing the installation of the glass piece 220.

[0053] Reference Figure 5 The first cover 200 has multiple fixing holes 260 on its inner side. In this embodiment, four fixing holes 260 are provided. The four fixing holes 260 are evenly distributed on the top cover. Each fixing hole 260 has an internal thread. The fixing holes 260 can be used with bolts to fix the display board so that the display circuit can be designed independently and the wiring of the inlet and outlet can be convenient.

[0054] Reference Figure 2 The opening of the sensor cavity 120 is located on the side of the housing 100. The surface where the opening of the sensor cavity 120 is located is perpendicular to the surface where the opening of the alarm circuit cavity 110 is located. When the alarm is installed normally, the sensor cavity 120 faces downwards to avoid dust and water accumulation.

[0055] Reference Figure 1 and Figure 6The second cover 300 has an air inlet 310. In this embodiment, the air inlet 310 is rectangular and can be applied to TDLAS laser sensors with irregular structures. A metal mesh 320 is fixedly connected to the side cover by screws. The metal mesh 320 is used to block the air inlet 310 to prevent foreign objects from piercing it and to protect the gas sensor in the sensor cavity 120.

[0056] Reference Figure 7 The second cover 300 has a replaceable dustproof film 330 on its outer side. The second cover 300 is provided with a fixing slot 340. The dustproof film 330 is detachable. In this embodiment, the dustproof film 330 is adhered to the outer side of the second cover 300, making it easy for the user to replace it himself.

[0057] The implementation principle of the explosion-proof structure shell of the gas alarm in this application embodiment is as follows: The gas alarm shell structure of this application adopts an explosion-proof structure design and is processed by die-cast aluminum. In terms of structural design, the alarm circuit cavity 110 and the sensor cavity 120 are combined into one, eliminating the corresponding mechanical processing procedures, simplifying assembly, reducing processing costs, and improving product reliability.

[0058] Example 2

[0059] Reference Figure 8 The difference between this embodiment and Embodiment 1 is that the second cover 300 has three air inlets 310, which are spaced apart along the length of the second cover 300. This allows three conventional sensors to be installed in the sensor cavity 120, enabling simultaneous detection of three other sensors and improving the product's functionality. In other embodiments, two, four, or more air inlets 310 can be provided to adapt to different scenario needs.

[0060] The implementation principle of the explosion-proof structural housing of a gas alarm in this application embodiment is as follows: In many engineering sites, multiple gas detectors need to be installed at the same location to monitor and alarm different gases, such as combustible gases, toxic gases, and oxygen. The structural housing designed in this application can detect three gases simultaneously, reduce system power consumption, significantly reduce engineering costs, and improve system reliability.

[0061] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. An explosion-proof structural housing for a gas alarm, characterized in that: The device includes a housing (100), on which an alarm circuit cavity (110) for installing an alarm circuit and a sensor cavity (120) for installing a gas sensor are provided. The alarm circuit cavity (110) and the sensor cavity (120) are connected through a wire hole (130).

2. The explosion-proof structural housing of a gas alarm according to claim 1, characterized in that: The threading hole (130) is filled with epoxy resin.

3. The explosion-proof structural housing of a gas alarm according to claim 2, characterized in that: The wire hole (130) has a tapered structure. The diameter of the wire hole (130) gradually decreases from the sensor cavity (120) to the alarm circuit cavity (110). A groove is provided on the side wall of the wire hole (130).

4. The explosion-proof structural housing of a gas alarm according to claim 1, characterized in that: The housing (100) is detachably connected to a first cover (200) for blocking the alarm circuit cavity (110) and a second cover (300) for blocking the sensor cavity (120), and the second cover (300) is provided with at least one air inlet (310).

5. The explosion-proof structural housing of a gas alarm according to claim 1, characterized in that: The alarm circuit cavity (110) and the sensor cavity (120) are perpendicular to each other.

6. The explosion-proof structural housing of a gas alarm according to claim 4, characterized in that: The first cover (200) has a viewing window (210) and a glass plate (220) is provided inside the viewing window (210).

7. The explosion-proof structural housing of a gas alarm according to claim 4, characterized in that: Both the first cover (200) and the second cover (300) are provided with sealing rings.

8. The explosion-proof structural housing of a gas alarm according to claim 4, characterized in that: A dustproof film (330) is adhered to the second cover (300).

9. The explosion-proof structural housing of a gas alarm according to claim 4 or 8, characterized in that: The second cover (300) is provided with a metal wire mesh (320) for sealing the air inlet (310).

10. The explosion-proof structural housing of a gas alarm according to claim 1, characterized in that: The housing (100) has two inlet ports (140), both of which are connected to the alarm circuit cavity (110). The two inlet ports (140) are located on opposite sides of the housing (100). The housing (100) has at least one outlet port (150), which is connected to the alarm circuit cavity (110).

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