CN216870431U - Gas detector - Google Patents
Gas detector Download PDFInfo
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- CN216870431U CN216870431U CN202122939944.3U CN202122939944U CN216870431U CN 216870431 U CN216870431 U CN 216870431U CN 202122939944 U CN202122939944 U CN 202122939944U CN 216870431 U CN216870431 U CN 216870431U
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Abstract
The utility model relates to the technical field of safety alarm, and discloses a gas detector which comprises a shell, a control assembly and a sensor, wherein the shell comprises an upper shell part and a lower shell part convexly arranged at the lower end of the upper shell part, the lower shell part is provided with a cavity body which is opened downwards, a dust screen is arranged in the cavity body, the cavity body is divided into an upper cavity and a lower cavity which are sequentially arranged from top to bottom by the dust screen, the control assembly is arranged in the upper shell part, the sensor is arranged in the upper cavity, and the sensor is electrically connected with the control assembly. The lower part of the shell is provided with a waterproof space with a lower cavity structure, so that the detector can be protected from being damaged by soaking water for a short time, the ventilation capacity of the dust screen can be improved, and sudden abnormal damage can be reduced.
Description
Technical Field
The utility model relates to the technical field of safety alarm, in particular to a gas detector.
Background
With the wide use of natural gas, the safety of people is improved, the demand of combustible gas detectors is rapidly increased, and a large number of products are installed and used in gas use places in China for detecting the concentration of combustible gas. Along with the increase of the using amount of instruments, the reliability problem is gradually outstanding, industrial and commercial point-type combustible gas detectors are technically optimized for many years, the product protection grade is basically not lower than IP65, the detector has certain dustproof capacity, can be prevented from being damaged in rain, and can be used in various gas places.
At present, the commonly used combustible gas detector detects the concentration of combustible gas by utilizing the thermal effect principle of catalytic combustion after the contact of a sensor and gas, the detection precision is reduced due to the adhesion of dust objects on the surface of the sensor, and the protection of the sensor is very important. The dust-proof net is arranged at the contact position of the sensor and the gas, and the detector above the IP65 grade only needs to be arranged below the sensor to form a gas-permeable space. However, if rain or vertical water flows through the dust screen, the water film is formed on the dust screen, so that gas is prevented from permeating the dust screen to contact the sensor, the sensor can recover normal operation only when the dust screen recovers ventilation, and the detection failure period of the detector can appear in waiting time.
In addition, the sensor may not be soaked in water, which may accelerate its aging and damage. When the combustible gas detector is installed in underground places where accumulated water can appear, such as valve wells, underground pipe galleries and the like, the damage to the sensor caused by the accumulated water is considered, a water level measuring device and drainage equipment need to be arranged, meanwhile, personnel are arranged to perform regular maintenance and inspection, and the increase of construction cost and maintenance cost is caused.
SUMMERY OF THE UTILITY MODEL
The purpose of the utility model is: a gas detector with a waterproof sensor is designed.
In order to achieve the purpose, the utility model provides a gas detector which comprises a shell, a control assembly and a sensor, wherein the shell comprises an upper shell part and a lower shell part convexly arranged at the lower end of the upper shell part, the lower shell part is provided with a cavity body which is opened downwards, a dust screen is arranged in the cavity body, the cavity body is divided into an upper cavity chamber and a lower cavity chamber which are sequentially arranged from top to bottom by the dust screen, the control assembly is arranged in the upper shell part, the sensor is arranged in the upper cavity chamber, and the sensor is electrically connected with the control assembly.
Preferably, the longitudinal section of the lower chamber is in a horn shape with a narrow top and a wide bottom.
Preferably, the upper chamber is cylindrical, the lower chamber comprises an upper end circular platform part and a lower end cylindrical part which are sequentially communicated from top to bottom, the end with the smaller diameter of the upper end circular platform part is communicated with the upper chamber, and the end with the larger diameter of the upper end circular platform part is communicated with the lower end cylindrical part.
Preferably, the inclination of the side surface of the upper end circular truncated cone portion in the vertical direction is 15-30 degrees.
Preferably, the ratio of the height of the lower chamber to the inner diameter of the upper chamber is 3:2 to 3: 4.
Preferably, the upper chamber and the lower chamber are detachably connected, and a sealing element is arranged at the joint of the upper chamber and the lower chamber.
Preferably, the upper chamber is connected with the lower chamber through threads, and the sealing element is a sealing ring.
Preferably, the upper portion of the housing is integrally formed with the upper chamber.
Preferably, the shell is made of cast iron or aluminum alloy.
Compared with the prior art, the gas detector provided by the embodiment of the utility model has the beneficial effects that:
according to the gas detector disclosed by the embodiment of the utility model, the cavity for containing air is constructed at the outer structure of the sensor, so that the sensor is positioned in the upper cavity, when the detector is submerged due to the rising of the water level at the installation position of the gas detector, the sensor is positioned in the waterproof space constructed by the air stored in the cavity, and cannot be damaged by soaking water; when meeting rivers such as heavy rain and contacting the detector, the dust screen is located cavity upper portion and can not be moistened by water, does not influence detector working property, detector normal operating.
Drawings
FIG. 1 is a schematic diagram of a gas detector according to an embodiment of the present invention;
in the figure, 1, a housing; 11. the upper part of the shell; 12. a lower portion of the housing; 2. a cavity; 21. an upper chamber; 22. a dust screen; 23. a lower chamber; 231. an upper end circular table portion; 232. a lower cylindrical portion; 3. a control component; 4. a sensor; 5. and a seal.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples. The following examples are intended to illustrate the utility model but are not intended to limit the scope of the utility model.
In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. used herein are used to indicate orientations or positional relationships based on those shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention.
In the description of the present invention, it should be understood that the terms "connected," "fixed," and the like are used in a broad sense, and for example, the terms "connected," "connected," and "fixed" may be fixed, detachable, or integrated; the connection can be mechanical connection or welding connection; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
As shown in fig. 1, a gas detector according to a preferred embodiment of the present invention includes a casing 1, a control module 3, and a sensor 4, where the casing 1 includes an upper casing part 11 and a lower casing part 12 protruding from a lower end of the upper casing part 11, the lower casing part 12 has a cavity 2 opening downward, a dust screen 22 is disposed in the cavity 2, the dust screen 22 divides the cavity 2 into an upper cavity 21 and a lower cavity 23, which are sequentially disposed from top to bottom, the control module 3 is disposed in the upper casing part 11, the sensor 4 is disposed in the upper cavity 21, and the sensor 4 is electrically connected to the control module 3.
The upper part 11 of the shell of the gas detector is of a waterproof structure as a whole, and the lower part 12 of the shell is provided with a downward opening for air circulation, so that the sensor 4 in the gas detector can be in contact with air to monitor the air condition.
The sensor of the utility model is arranged in an upper chamber 21 of the lower part 12 of the housing, and a lower chamber 23 for storing air is constructed below the sensor as a waterproof space, and the volume of the air in the lower chamber 23 is designed according to the ideal gas law. When the water level rises to contact with the lower part 12 of the shell, the gas in the lower chamber 23 contacts with the water surface, the liquid level and the gas pressure are the same, the gas in the lower chamber 23 is in a balanced state, and the water inflow can be controlled by changing the volume of the gas, namely the water inflow can be controlled by changing the volume of the lower chamber 23.
According to an ideal gas state equation: the expression vector pV is n RT,
wherein p is pressure (Pa), and the pressure of the gas just contacting with the water surface is 101.325kPa under the standard atmospheric pressure; v is the gas volume (m)3) I.e. the volume of the lower chamber 23; t is the temperature (K); n is the amount (mol) of the substance of the gas; r is the molar gas constant, also known as the universal gas constant (J/(mol.k).
The gas detector is fixedly arranged at a detection point, when the water level rises, the gas components and the water components in the lower chamber 23 basically do not change, the values of n, R and T basically do not change, and the volume compression of the gas in the lower chamber 23 after the shell 1 is soaked in water is mainly influenced by the gas pressure. The relationship between the rise in liquid level and the compression of the gas volume in the lower chamber 23, i.e. p, is calculated by engineering of the ideal gas conditions1V1P is pV, wherein p1The pressure, V, of the gas in the lower chamber 23 when the lower part 12 of the housing is immersed in water1The lower part 12 of the housing is immersed in waterThe volume of gas in the chamber 23.
When the lower housing part 12 is immersed in water, the pressure of the gas in the lower chamber 23: p is a radical of formula1＝p+phWherein p ishIs the pressure which increases with the rising liquid level; calculating according to a liquid pressure formula: p is a radical ofhρ gh, where ρ is the liquid density (1 kg/m)3) (ii) a g is the acceleration of gravity (9.8N/kg); h is the depth (m) of the contact surface of the gas and the water; the values of rho and g are basically unchanged, so that when the depth h is increased, the pressure p is increased1Increase and volume V of gas in the lower chamber 231And becomes smaller.
The volume of the lower cavity 23 is determined by estimating the depth of water accumulation soaking possibly occurring at the installation position of the gas detector, and the probability of soaking damage of the sensor can be greatly reduced by setting the waterproof depth of the gas detector to be 10 m in consideration of safety protection. Calculating according to a formula:
through the calculation result, when the immersion depth of the detector reaches 10 meters, the volume of the gas in the lower chamber 23 is reduced by about a half, and the design has extremely high practicability. If the waterproof depth needs to be further improved, the volume size of the lower chamber 23 to be set can be further calculated and obtained through a formula.
Further, the longitudinal section of the lower chamber 23 is in a horn shape with a narrow top and a wide bottom. The cross sectional area in the lower chamber 23 is continuously increased from top to bottom, namely the occupied space proportion of the upper part is small, the occupied space proportion of the lower part is large, when the shell 1 is soaked with water and is extruded by gas, the liquid level of the water inlet in the lower chamber 23 is smaller than that of the water inlet with a cylindrical or horn-shaped longitudinal section with a wide top and a narrow bottom; and the horn-shaped lower cavity chamber 23 can ensure the free diffusion area of the gas at the lower end of the sensor 4, and the detected gas can fully contact with the sensor 4, thereby ensuring the detection sensitivity.
Further, the upper chamber 21 is cylindrical, the lower chamber 23 includes an upper end circular platform 231 and a lower end cylindrical portion 232 which are sequentially penetrated from top to bottom, the end with the smaller diameter of the upper end circular platform 231 is communicated with the upper chamber 21, and the end with the larger diameter of the upper end circular platform 231 is communicated with the lower end cylindrical portion 232. The tail end of the lower part 12 of the shell is in a round table shape, so that manual operation or tool clamping during installation and maintenance of the gas detector are facilitated, and the water surface is prevented from generating waves due to the fact that the opening is too large to affect the waterproof effect.
Further, the inclination of the side surface of the upper end circular truncated cone 231 in the vertical direction is 15 to 30 degrees, and when the inclination is smaller, the gas diffusion volume may be insufficient; when the inclination is large, the water surface generates waves which may affect the waterproof effect of the sensor 4.
Furthermore, the ratio of the height of the lower chamber 23 to the inner diameter of the upper chamber 21 is 3: 2-3: 4, and the ratio can ensure that the lower chamber 23 contains a certain volume of air while the overall appearance ratio of the lower part 12 of the shell is proper, so that the sensor 4 is prevented from being filled with water.
Further, the upper chamber 21 is detachably connected with the lower chamber 23, and a sealing member 5 is arranged at the connection position of the upper chamber 21 and the lower chamber 23.
Further, the upper chamber 21 and the lower chamber 23 are connected by a thread, and the sealing member 5 is a sealing ring.
Further, the upper housing portion 11 is integrally formed with the upper chamber 21.
Further, the housing 1 is made of cast iron or aluminum alloy.
According to explosion-proof grade requirement, the gas detector mainly adopts explosion-proof type, detector casing 1 generally adopts cast iron or aluminum alloy material, and the life of sensor 4 is about 3 years, and the sensor 4 installation department needs to be unpack apart regularly, so lower cavity 23 and last cavity 21 can be dismantled and be connected, are convenient for change sensor 4 to use rubber seal to do sealing protection.
The upper part 11 and the lower chamber 23 of the shell are made of the same material and have the same thickness as the upper chamber 21, so that the supporting strength and the protection grade of the whole detector are ensured to be the same.
In summary, the embodiment of the present invention provides a gas detector, wherein the lower part 12 of the housing has a waterproof space formed by the lower chamber 23, so as to protect the detector from being damaged by short-term water soaking, improve the ventilation capability of the dust screen 22, and reduce sudden abnormal damage. The gas detector has the advantages of simple structure, strong practicability, convenient manufacture and low cost, can be installed in outdoor open places or buried places for use, enlarges the installation environment range, and can effectively reduce the manual overhaul times.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and substitutions can be made without departing from the technical principle of the present invention, and these modifications and substitutions should also be regarded as the protection scope of the present invention.
Claims (9)
1. The utility model provides a gas detector, its characterized in that, includes casing, control assembly and sensor, the casing includes shell upper portion and protruding locating the shell lower part of the lower extreme on shell upper portion, the shell lower part has open cavity down, be equipped with the dust screen in the cavity, the dust screen will the cavity is separated into last cavity and the lower cavity that sets gradually from top to bottom, control assembly locates in the shell upper portion, the sensor is located in the last cavity, just the sensor with the control assembly electricity is connected.
2. The gas detector according to claim 1, wherein the longitudinal section of the lower chamber is in a horn shape with a narrow top and a wide bottom.
3. The gas detector according to claim 2, wherein the upper chamber has a cylindrical shape, the lower chamber includes an upper circular platform portion and a lower cylindrical portion which are sequentially connected from top to bottom, the upper circular platform portion has a smaller diameter and is communicated with the upper chamber, and the upper circular platform portion has a larger diameter and is communicated with the lower cylindrical portion.
4. The gas detector according to claim 3, wherein the inclination of the side surface of the upper end dome portion in the vertical direction is 15 to 30 degrees.
5. The gas detector of claim 4, wherein a ratio of a height of the lower chamber to an inner diameter of the upper chamber is 3:2 to 3: 4.
6. The gas detector of claim 1, wherein the upper chamber is detachably connected to the lower chamber, and a sealing member is disposed at a connection position of the upper chamber and the lower chamber.
7. The gas detector of claim 6, wherein the upper chamber is threadably connected to the lower chamber and the seal is a gasket.
8. The gas detector of claim 1, wherein the upper housing portion is integrally formed with the upper chamber.
9. A gas detector according to any one of claims 1 to 8, characterised in that the housing is of cast iron or aluminium alloy.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122939944.3U CN216870431U (en) | 2021-11-25 | 2021-11-25 | Gas detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202122939944.3U CN216870431U (en) | 2021-11-25 | 2021-11-25 | Gas detector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216870431U true CN216870431U (en) | 2022-07-01 |
Family
ID=82128797
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202122939944.3U Active CN216870431U (en) | 2021-11-25 | 2021-11-25 | Gas detector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216870431U (en) |
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2021
- 2021-11-25 CN CN202122939944.3U patent/CN216870431U/en active Active
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