CN218782177U - Correlation type laser methane detection module - Google Patents

Abstract

The utility model discloses a correlation formula laser methane detection module, include: the device comprises a shell, a laser, a diaphragm, a photoelectric detector and a control circuit board, wherein the laser, the diaphragm, the photoelectric detector and the control circuit board are installed on the shell, and an open air chamber communicated with the outside is formed in the shell. The laser, the diaphragm and the photoelectric detector are arranged in the open air chamber at intervals in a straight line. The control circuit board is mounted on the housing. The control circuit board is electrically connected with the laser and the photoelectric detector so as to control the laser to emit laser and receive detection signals generated by the photoelectric detector. The utility model discloses correlation formula laser methane detection module, methane can be followed external diffusion and surveyed in to open air chamber, and simple structure need not to adopt the pump suction formula mode to gather methane, low power dissipation. In the detection process, the laser emits laser, enters the photoelectric detector for detection after passing through the diaphragm, and demodulates the final methane concentration through the control circuit board; the diaphragm can eliminate reflected laser on the end face of the photoelectric detector, and is strong in anti-interference performance and low in false alarm rate.

Description

Correlation type laser methane detection module

Technical Field

The utility model belongs to the technical field of gas detector, specifically a correlation formula laser methane detects module.

Background

Methane is a main component of natural gas in the fields of urban gas pipe networks, industrial chemical industry parks and the like, and the explosion limit in the air is 5-15 percent, and the explosion is most severe about 9.5 percent. In the last five years, the gas pipe network in China realizes the rapid increase of 40 to 80 kilometers, and meanwhile, explosion and fire accidents caused by the leakage of the gas pipe network are frequent, thereby causing great loss to the lives and properties of people. There have been many cases of natural gas explosion accidents resulting in casualties.

The new safety production law, which is implemented from 9.1.2021, stipulates that the production and operation units in the industries such as catering and the like use gas, a combustible gas alarm device is required to be installed, and the normal use of the combustible gas alarm device is guaranteed. At present, the number of gas users in China reaches 1.76 hundred million, the gas users will grow at a speed of 50% in recent years, and the number of users for installing the combustible gas alarm at the early stage is very small. According to the survey and prediction of the national institute of development and research center market economic research institute, the demand of urban families of China on combustible gas alarm products is vigorous in five years in the future, the expected purchase rate reaches about 50%, and the market of users is huge.

In the related art, the existing methane gas detectors such as semiconductor type gas detectors, electrochemical detectors, contact gas sensitive sensors and the like have some inherent disadvantages when used for real-time online detection of gas leakage of adjacent spaces in the underground of cities: the detection sensitivity is low, the precision is low, the response is slow, the service life is short, false alarm is easy to occur, the corrosion resistance and the oxidation resistance are not good, and the application requirement of severe environment conditions is difficult to meet. Although the precision of the existing methane gas detector is high, the size is large, the power consumption is high, and the detection requirement under severe environment cannot be met.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the technical problem that exists among the prior art at least. Therefore, the utility model provides a correlation formula laser methane detection module, the anti-interference of correlation formula laser methane detection module is strong, the low wrong report, sensitivity is high, the structure is small and exquisite, reliable and stable, work under the adaptable abominable operating mode.

According to the utility model discloses correlation formula laser methane detection module, include: the air conditioner comprises a shell, a fan and a controller, wherein an open air chamber communicated with the outside is arranged on the shell; the laser, the diaphragm and the photoelectric detector are all arranged on the shell, and are sequentially arranged in the open air chamber at intervals in a straight line; a control circuit board mounted on the housing; the control circuit board is electrically connected with the laser and the photoelectric detector so as to control the laser to emit laser and receive detection signals generated by the photoelectric detector.

According to the utility model discloses correlation formula laser methane detection module, methane can be surveyed in external diffusion to open air chamber, and simple structure need not to adopt the pumping formula mode to gather methane, low power dissipation. When the specific leakage concentration of methane needs to be detected, the laser emits laser, the laser enters the photoelectric detector for detection after passing through the diaphragm, and the final methane concentration is demodulated through the control circuit board. Because the diaphragm is arranged between the laser and the photoelectric detector, part of reflected laser which is injected into the end face of the photoelectric detector can be blocked and eliminated by the diaphragm, the interference of the reflected laser to the work of the laser is effectively prevented, and the anti-interference performance of the correlation laser methane detection module is improved, so that the linearity of a signal detected by the photoelectric detector is good, the detection zero point is stable and does not drift, the false alarm rate of the correlation laser methane detection module is low, and the correlation laser methane detection module can work in different environments. The laser and the photoelectric detector which are arranged in a straight line can realize correlation, the path is short, and high sensitivity and high precision can be realized when the methane is detected.

According to the utility model discloses correlation formula laser methane detection module of some embodiments, open air chamber is located one side of casing, the casing is keeping away from form assembly space on open air chamber's the opposite side, control circuit board's at least part is connected in the assembly space.

Optionally, the casing includes main coverboard and first bounding wall, be connected with on the periphery of main coverboard first bounding wall, the extending direction of first bounding wall with main coverboard is the contained angle, main coverboard with enclose between the first bounding wall and synthesize the assembly space, the assembly space has the assembly mouth.

Further, the shell further comprises a second enclosing plate, the second enclosing plate is connected with the main shell plate, and the second enclosing plate is arranged in the open air chamber; the laser is arranged in an area enclosed by one group of the second enclosing plates and the main shell plate, and the photoelectric detector is arranged in an area enclosed by the other group of the second enclosing plates and the main shell plate.

Optionally, two opposite sides of the assembly space are provided with a first opening and a second opening, the first opening is communicated with the open air chamber and the assembly space, the second opening is communicated with the open air chamber and the assembly space, and the two sets of second enclosing plates are respectively arranged around the first opening and the second opening.

Optionally, the control circuit board includes a main control board, a first circuit board and a second circuit board, the main control board is connected in the assembly space, and two ends of the main control board extend to the first opening and the second opening respectively; the first circuit board is connected with the main control board and is positioned at one end of the first opening, the first circuit board extends into the open air chamber from the first opening, and the laser is connected with the first circuit board; the second circuit board is connected with one end, located at the second opening, of the main control board, the second circuit board extends into the open air chamber from the second opening, and the photoelectric detector is connected with the second circuit board.

According to the correlation laser methane detection module of some embodiments of the present invention, the first circuit board and the second circuit board are arranged in parallel, the first circuit board is provided with a first jack, and a first pin of the laser is connected to the first jack; and a second jack is arranged on the second circuit board, and a second pin of the photoelectric detector is connected to the second jack.

Advantageously, the correlation laser methane detection module further comprises a temperature and pressure sensor, a mounting hole communicated with the open air chamber and the assembly space is formed in the shell, the temperature and pressure sensor is connected in the mounting hole and electrically connected with the control circuit board, and the control circuit board can read data of the temperature and pressure sensor.

According to the utility model discloses correlation formula laser methane detects module, the laser instrument is distributed feedback laser instrument.

According to the correlation laser methane detection module of some embodiments of the present invention, the housing is a heat conductive metal member, and a plating layer is disposed on the surface of the housing; and/or a protective layer is arranged on the control circuit board.

Additional aspects and advantages of the invention will be set forth in the description which follows, or may be learned by practice of the invention.

Drawings

The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:

fig. 1 is a schematic view of a three-dimensional structure of a correlation laser methane detection module according to some embodiments of the present invention at a first angle.

Fig. 2 is a schematic view of a three-dimensional structure of the correlation laser methane detection module according to some embodiments of the present invention at a second angle.

Reference numerals:

1000. a correlation laser methane detection module;

100. a housing;

101. opening the air chamber; 102. an assembly space; 103. an assembly port; 104. an installation port; 105. mounting holes;

110. a main shell plate; 120. a first enclosing plate; 130. a second enclosing plate; 141. a first opening; 142. a second opening;

200. a laser;

300. a diaphragm;

400. a photodetector;

500. a control circuit board;

510. a main control board;

520. a first circuit board; 521. a first jack; 530. a second circuit board; 531. a second jack;

600. a temperature and pressure sensor.

Detailed Description

Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary only for the purpose of explaining the present invention, and should not be construed as limiting the present invention.

In the description of the present invention, it is to be understood that the terms "thickness", "upper", "lower", "front", "rear", "inner", "outer", "circumferential", and the like, indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are used merely for convenience of description and simplification of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

The utility model discloses correlation formula laser methane detection module 1000 of embodiment can realize that high sensitivity, high accuracy, the quick detection of methane are described below with reference to the description figure, and the interference killing feature is strong, low wrong report, low-power consumption, job stabilization are reliable.

According to the utility model discloses correlation formula laser methane detection module 1000, include: such as the housing 100, the laser 200, the aperture 300, and the photodetector 400 shown in fig. 1, and the control circuit board 500 shown in fig. 1 and 2.

As shown in fig. 2, the casing 100 has an open chamber 101 communicating with the outside, that is, when methane leaks from the outside, methane can enter the open chamber 101 by diffusion.

As shown in fig. 1, the laser 200, the diaphragm 300 and the photodetector 40 are all mounted on the housing 100, and the laser 200, the diaphragm 300 and the photodetector 400 are sequentially arranged in the open air chamber 101 at intervals in a straight line, so that the diaphragm 300 is arranged between the laser 200 and the photodetector 400, and the diaphragm 300 can effectively filter the light reflected from the photodetector 400. The optical path formed between the laser 200 and the photodetector 400 for detecting methane is linear.

As shown in fig. 2, the control circuit board 500 is mounted on the housing 100. The control circuit board 500 is electrically connected to the laser 200 and the photodetector 400 to control the laser 200 to emit laser light and receive a detection signal generated by the photodetector 400.

According to the structure, the utility model discloses correlation formula laser methane detection module 1000, methane can be surveyed from external diffusion to open air chamber 101, and simple structure need not to adopt the pump to inhale the formula mode and gathers methane. It can be appreciated that the power consumption of the correlation laser methane detection module 1000 is lower than that of the pump-suction type detection module; the correlation formula laser methane detection module 1000 of this product has also avoided the sampling pump to damage and has leaded to the reduction of correlation formula laser methane detection module 1000 whole life-span.

When the specific leakage concentration of methane needs to be detected, the laser 200 emits laser light, the laser light enters the photoelectric detector 400 through the diaphragm 300 for detection, and the final methane concentration is demodulated through the control circuit board 500. Because the diaphragm 300 is arranged between the laser 200 and the photoelectric detector 400, part of reflected laser which is injected into the end face of the photoelectric detector 400 can be blocked and eliminated by the diaphragm 300, the reflected laser is effectively prevented from returning to the laser 200 again and causing interference to the laser emitting work of the laser 200, the sawtooth wave signal linearity of the laser 200 is effectively prevented from being deteriorated, the anti-interference performance of the correlation laser methane detection module 1000 is improved, the signal linearity detected by the photoelectric detector is good, the detection zero point is stable and does not drift, the false alarm rate of the correlation laser methane detection module 1000 is low, and the correlation laser methane detection module can work in different environments.

Correlation formula laser methane detection module 1000 in this application, laser instrument 200 and photoelectric detector 400 that are the straight line and arrange can realize the correlation, and the route is short, can realize high sensitivity and high accuracy when surveying methane. The spacing distance between the laser 200 and the photodetector 400 is far enough, so that a sufficient space is provided between the laser and the photodetector to accommodate methane, and the accuracy of methane detection is improved. The whole structure is simple, and the installation of each part is convenient and rapid.

It can be understood that, compare detection sensitivity among the prior art low, the precision is low, the response is slow, the life-span is short, take place the mistake easily and report, the big detection module of size, the utility model discloses a correlation formula laser methane detection module 1000 detection sensitivity is high, the precision is good, the response is quick, longe-lived, be difficult for producing the wrong report, the structure is small and exquisite, can be used to survey methane under the adverse circumstances, if be used in the real-time online detection that the underground adjacent space gas in city leaked.

In some embodiments of the present invention, as shown in fig. 1, the open air chamber 101 is located at one side of the casing 100, and as shown in fig. 1 and 2, the casing 100 forms the assembly space 102 on the other side away from the open air chamber 101, and at least part of the control circuit board 500 is connected in the assembly space 102. That is, the opposite side surfaces of the housing 100 form the open air chamber 101 and the mounting space 102, respectively, and the control circuit board 500 is mainly mounted in the mounting space 102, and a small portion of the control circuit board 500 may penetrate into the open air chamber 101; or the control circuit board 500 is entirely installed in the mounting space 102 without entering the open plenum 101. The main body part or the whole of the control circuit board 500 is arranged in the assembly space 102 instead of the open air chamber 101, so that the corrosion of gas such as methane and dust to the control circuit board 500 can be effectively isolated, and the cleanliness of the control circuit board 500 and the stability of the working environment are improved. It is also possible to avoid the reduction of the space of the open gas chamber 101 due to the installation of the control circuit board 500 in the open gas chamber 101, thereby ensuring that the amount of methane passing through the open gas chamber 101 is sufficient and the photodetector 400 is sufficient to detect methane. The housing 100 can also provide effective support for the control circuit board 500, so that the control circuit board 500 can be stably and stably mounted on the housing 100 without shaking. Thereby making the control circuit board 500 more stable to the control signal of the laser 200.

In some specific examples, as shown in fig. 2, a main portion of the control circuit board 500 is located in the assembly space 102, and a portion of the control circuit board 500 may extend into the open gas chamber 101, and a portion of the circuit board extending into the open gas chamber 101 may facilitate connection with the laser 200 and/or the photodetector 400.

Optionally, as shown in fig. 1, the casing 100 includes a main shell plate 110 and a first enclosing plate 120, as shown in fig. 2, the first enclosing plate 120 is connected to a periphery of the main shell plate 110, an extending direction of the first enclosing plate 120 forms an angle with the main shell plate 110, an assembly space 102 is enclosed between the main shell plate 110 and the first enclosing plate 120, and the assembly space 102 has an assembly opening 103. Then, the space enclosed by the main casing plate 110 and the first enclosing plate 120 is the assembling space 102 with the assembling opening 103 on one side, the control circuit board 500 is conveniently installed in the assembling space 102 in the assembling opening 103, and the control circuit board 500 is attached to the bottom surface of the main casing plate 110, so that the assembling convenience of the control circuit board 500 is improved.

In a specific example, the first enclosing plate 120 is perpendicular to the main shell plate 110, an included angle between the first enclosing plate 120 and the main shell plate 110 is 90 degrees, a surface where the first enclosing plate 120 is located and a surface where the main shell plate 110 is located are perpendicular to each other, so that the occupied space is small, the installation is convenient, and when the control circuit board 500 is installed in the assembling space 102, the first enclosing plate 120 can guide the control circuit board 500.

In other examples, the first enclosing plate 120 and the main shell plate 110 may be arranged at an obtuse angle, so that the cross section of the assembling space 102 in the direction from the assembling opening 103 to the main shell plate 110 is gradually reduced, thereby facilitating the assembling of the control circuit board 500 and facilitating the operation of a human hand.

Optionally, a protective layer is disposed on the control circuit board 500, so that the control circuit board 500 achieves corrosion protection, oxidation protection, water protection, explosion protection, and sealing effects. For example, in a specific example, the protection layer is formed by performing glue filling on the control circuit board 500, and a specific kind of the glue filling may be polyurethane. The assembling hole 103 facilitates the glue filling of the control circuit board 500.

Optionally, as shown in fig. 1, the housing 100 further includes a second enclosure 130, the second enclosure 130 is connected to the main housing 110, and the second enclosure 130 is disposed in the open plenum 101. The second enclosing plate 130 and the first enclosing plate 120 are respectively located on different sides of the main shell 110, for example, the second enclosing plate 130 is disposed on the top surface of the main shell 110, and the first enclosing plate 120 is disposed on the bottom surface of the main shell 110.

Further, as shown in fig. 1, the laser 200 is disposed in the region enclosed by one set of the second surrounding board 130 and the main casing board 110, and the photodetector 400 is disposed in the region enclosed by the other set of the second surrounding board 130 and the main casing board 110. The second enclosing plate 130 may impose certain restrictions on the mounting area of the photodetector 400 or the laser 200, so that the mounting positions of the two have certain references, and the laser 200 and the photodetector 400 are conveniently positioned at specific positions relative to the main housing 100; and also effectively protects the photodetector 400 or the laser 200 from wear by environmental elements. The second shroud 130 is arranged so as not to impede the diffusion of methane.

In some specific examples, one set of the second enclosing plates 130 is disposed at one end of the upper top surface of the main shell 110, another set of the second enclosing plates 130 is disposed at the other end of the upper top surface of the main shell 110, and the diaphragm 300 is disposed in the middle region of the main shell 110, such that the laser 200, the diaphragm 300, and the photodetector 400 are linearly arranged and spaced apart.

Advantageously, as shown in fig. 1 and 2, the opposite sides of the fitting space 102 are provided with a first opening 141 and a second opening 142, the first opening 141 communicating the open plenum 101 with the fitting space 102, and the second opening 142 communicating the open plenum 101 with the fitting space 102, wherein one set of second enclosing plates 130 is enclosed around the first opening 141, and wherein the other set of second enclosing plates 130 is enclosed around the second opening 142. In these examples, the first opening 141 and the second opening 142 are opened in the thickness direction of the main case plate 110, so that the fitting space 102 and the open plenum 101 can be communicated.

Optionally, each set of second enclosing plate 130 includes two vertical plates extending in the up-down direction, and a top plate extending in the horizontal direction, and two vertical plates are connected to two ends of the top plate respectively, so as to form a U-shaped bracket, which facilitates the arrangement of the laser 200 and the photodetector 400.

Optionally, as shown in fig. 1 and fig. 2, the control circuit board 500 includes a main control board 510, a first circuit board 520, and a second circuit board 530, the main control board 510 is connected in the assembly space 102, and two ends of the main control board 510 respectively extend to the first opening 141 and the second opening 142. As shown in fig. 2, the first circuit board 520 is connected to the main control board 510 at one end of the first opening 141, the first circuit board 520 extends into the open air chamber 101 from the first opening 141, and the laser 200 is connected to the first circuit board 520, so that the laser 200 can be electrically connected to the main control board 510, and the laser 200 has a certain mounting height and mounting stability on the open air chamber 101. As shown in fig. 1, the second circuit board 530 is connected to the main control board 510 and located at one end of the second opening 142, the second circuit board 530 extends into the open air chamber 101 from the second opening 142, and the photo detector 400 is connected to the second circuit board 530, so that the photo detector 400 can be electrically connected to the main control board 510, and the photo detector 400 has a certain mounting height and mounting stability on the open air chamber 101. Meanwhile, after the first circuit board 520 extends from the first opening 141, the second circuit board 530 extends from the second opening 142, and the main control board 510 is attached to the bottom surface of the main board 110, the control circuit board 500 can be quickly positioned and mounted with respect to the housing 100, thereby improving the assembly efficiency.

Optionally, as shown in fig. 1 and fig. 2, the first circuit board 520 and the second circuit board 530 are arranged in parallel, the first circuit board 520 is provided with a first jack 521, the laser 200 is connected to the first jack 521, the second circuit board 530 is provided with a second jack 531, and the photodetector 400 is connected to the second jack 531. The laser 200 can be plugged into the first jack 521 through the first pin on the laser to realize quick assembly with the first circuit board 520; the photodetector 400 can be plugged into the second receptacle 531 via the second pin thereof to achieve quick assembly with the second circuit board 530. Since the first circuit board 520 and the second circuit board 530 are parallel, after the laser 200 and the photodetector 400 are assembled, the optical-electrical transceiving path formed therebetween is perpendicular to the surface where the first circuit board 520 and the second circuit board 530 are located, so as to ensure accurate transceiving and reduce loss of transceiving signals.

In the description of the present invention, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features for distinguishing between descriptive features, non-sequential, non-trivial and non-trivial.

Optionally, the main control board 510 is provided with an MCU (micro controller Unit) main control chip, a laser temperature control chip, a memory chip, a resistor, a capacitor, and other electronic devices, and the MCU main control chip may be used to generate a scanning sawtooth modulation signal of the laser, and acquire, process, and demodulate the concentration of the detection signal of the photodetector 400. The laser temperature control chip is used for accurately controlling the temperature of the laser 200, and the temperature control precision is +/-0.01 ℃.

Optionally, as shown in fig. 1, the correlation laser methane detection module 1000 further includes a temperature and pressure sensor 600, a mounting opening 104 is provided on the housing 100 and communicates the open air chamber 101 with the assembly space 102, the temperature and pressure sensor 600 is connected to the mounting opening 104, the temperature and pressure sensor 600 is electrically connected to the control circuit board 500, and the control circuit board 500 can read data of the temperature and pressure sensor 600. The temperature and pressure sensor 600 is used for detecting the temperature and pressure of the diffused gas in the open gas chamber 101, and the measured temperature and pressure data are used for performing real-time online parameter compensation and correction on the demodulated gas concentration, so that the control circuit board 500 can accurately measure the methane concentrations at different temperatures and different pressures. Installing port 104 has certain thickness, makes temperature-pressure sensor 600 can not only stretch into and detect the temperature and the pressure of methane in the open air chamber 101, also makes temperature-pressure sensor 600 convenient be connected with control circuit board 500, and the lateral wall of installing port 104 can also effectively protect temperature-pressure sensor 600, makes temperature-pressure sensor 600 can not make a round trip to vibrate or by the wearing and tearing of environment spare.

In a specific example, the temperature and pressure sensor 600 is electrically connected to the MCU main control chip, and the data of the temperature and pressure measured by the temperature and pressure sensor 600 is used to perform real-time online parameter compensation and correction on the gas concentration demodulated by the MCU main control chip.

The utility model discloses an in some embodiments, laser instrument 200 is Distributed Feedback Laser instrument, distributed Feedback Laser instrument (DFB Laser instrument, distributed Feedback Laser), bragg grating has been built-in to this type of Laser instrument, is the semiconductor Laser of side emission, and it uses semiconductor material as the medium, and monochromaticity is good, and the narrow linewidth is anti-interference strong, can realize low misreport, sensitivity is high, the precision is high, long service life can reach more than 6 years, absorbs the detection to the single absorption spectral line 1653.7nm of methane gas.

In other examples, laser 200 may also employ other types of semiconductor lasers, as long as methane is efficiently detected.

In some embodiments of the present invention, the housing 100 is a heat-conducting metal member, so as to improve the heat dissipation performance of the housing 100, and when the control circuit board 500 generates heat in the working process, the heat can be dissipated quickly through the housing 100; the structure of the housing 100 is more stable and less prone to damage. For example, the heat conductive metal member may be an aluminum member, and the aluminum member may make the overall structure of the housing 100 lighter and have good heat conductivity.

Optionally, the surface of the casing 100 is provided with a plating layer, so that the casing 100 is not easily oxidized and corroded, and the aesthetic property of the casing 100 is improved. For example, in a specific example, the outer surface of the housing 100 is plated with a black corrosion and oxidation resistant layer by an electrophoretic technique.

Optionally, as shown in fig. 1, a plurality of mounting holes 105 are further provided on the main shell plate 110, and the plurality of mounting holes 105 may be connected with an external detection base through a fastener, so as to achieve the stability of the correlation laser methane detection module 1000 with respect to an external detection environment. Advantageously, the first shroud 120 may be recessed toward the mounting space 102 to avoid fasteners, facilitating the fasteners connecting the main housing plate 110 with the probe base.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The methane detection principle, the electrical connection and the electronic control transceiving principle of the correlation laser methane detection module 1000 according to the embodiment of the present invention are known to those skilled in the art, and will not be described in detail herein.

In the description of the present specification, references to the description of the terms "embodiment," "example," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

While embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims (10)

1. The utility model provides a correlation formula laser methane detection module which characterized in that includes:

the air conditioner comprises a shell, a fan and a controller, wherein an open air chamber communicated with the outside is arranged on the shell;

the laser, the diaphragm and the photoelectric detector are all arranged on the shell, and the laser, the diaphragm and the photoelectric detector are sequentially arranged in the open air chamber at intervals in a straight line;

a control circuit board mounted on the housing; the control circuit board is electrically connected with the laser and the photoelectric detector so as to control the laser to emit laser and receive detection signals generated by the photoelectric detector.

2. The correlation laser methane detection module of claim 1 wherein the open plenum is located on one side of the housing, the housing forming a mounting space on another side away from the open plenum, at least a portion of the control circuit board being connected in the mounting space.

3. The correlation laser methane detection module according to claim 2, wherein the housing comprises a main shell plate and a first enclosing plate, the first enclosing plate is connected to a periphery of the main shell plate, an extending direction of the first enclosing plate forms an included angle with the main shell plate, the main shell plate and the first enclosing plate enclose the assembly space, and the assembly space has an assembly opening.

4. The correlation laser methane detection module of claim 3 wherein the housing further comprises a second shroud, the second shroud being connected to the main housing, the second shroud being disposed in the open plenum; the laser is arranged in an area enclosed by one group of the second enclosing plates and the main shell plate, and the photoelectric detector is arranged in an area enclosed by the other group of the second enclosing plates and the main shell plate.

5. The correlation laser methane detection module according to claim 4, wherein a first opening and a second opening are disposed on two opposite sides of the assembly space, the first opening communicates with the open gas chamber and the assembly space, the second opening communicates with the open gas chamber and the assembly space, and two sets of the second enclosing plates are respectively enclosed around the first opening and the second opening.

6. The correlation laser methane detection module according to claim 5, wherein the control circuit board comprises a main control board, a first circuit board and a second circuit board, the main control board is connected in the assembly space, and two ends of the main control board extend to the first opening and the second opening respectively;

the first circuit board is connected with the main control board and is positioned at one end of the first opening, the first circuit board extends into the open air chamber from the first opening, and the laser is connected with the first circuit board;

the second circuit board is connected with one end, located at the second opening, of the main control board, the second circuit board extends into the open air chamber from the second opening, and the photoelectric detector is connected with the second circuit board.

7. The correlation laser methane detection module according to claim 6, wherein the first circuit board and the second circuit board are arranged in parallel, the first circuit board is provided with a first jack, and a first pin of the laser is connected to the first jack; and a second jack is arranged on the second circuit board, and a second pin of the photoelectric detector is connected to the second jack.

8. The correlation laser methane detection module according to claim 2, further comprising a temperature and pressure sensor, wherein the housing is provided with a mounting opening for communicating the open air chamber with the assembly space, the temperature and pressure sensor is connected to the mounting opening, the temperature and pressure sensor is electrically connected to the control circuit board, and the control circuit board can read data of the temperature and pressure sensor.

9. The correlation laser methane detection module of claim 1 wherein the laser is a distributed feedback laser.

10. The correlation laser methane detection module according to claim 1, wherein the housing is a heat-conducting metal member, and a surface of the housing is provided with a coating; and/or a protective layer is arranged on the control circuit board.

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