Combined combustible gas leakage detector

Abstract

The utility model provides a combined combustible gas leakage detector, which relates to the technical field of gas detection equipment, and comprises a first gas sensor, a second gas sensor, a gas detector and a controller, the second gas sensor is used for measuring the concentration of the combustible gas higher than the preset concentration; the first gas sensor and / or the second gas sensor can also be used for measuring the concentration of combustible gas equal to the preset concentration; wherein the first gas sensor is one of a thermocatalytic sensor, a laser sensor and a photoacoustic spectrum sensor, and the second gas sensor is a laser sensor or an infrared sensor. The combustible gas detection device has the beneficial effects that the low-concentration combustible gas is detected through the first gas sensor suitable for detecting the low-concentration combustible gas, and meanwhile, the high-concentration combustible gas is detected through the second gas sensor suitable for detecting the high-concentration combustible gas, so that wider range coverage is realized, the detection precision and reliability are improved, and the detection cost is reduced. And false alarm and missing alarm are avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection equipment, in particular to a combined combustible gas leakage detector. Background Technique

[0002] Methane leakage detection is an important link in gas pipeline leakage repair, leakage inspection, household inspection, mine gas detection, underground pipeline leakage detection, etc. However, most of the existing methane detectors use single-principle sensors, which have problems such as limited measurement range, insufficient accuracy, and susceptibility to interference. Especially in the inspection operation environment, the concentration of leaked gas is high or low, and a single sensor often cannot accurately measure and find the leakage point, and is easily affected by environmental factors, resulting in false alarms and missed alarms.

[0003] For example, Chinese Patent No. CN220340163U discloses a portable methane sensor. This portable methane sensor uses a single-principle sensor, has a limited measurement range, and is prone to false alarms and missed alarms during actual application. Summary of the Utility Model

[0004] In view of this, in order to solve the problem of limited measurement range of existing methane detectors, an embodiment of the utility model provides a combined combustible gas leakage detector.

[0005] An embodiment of the utility model provides a combined combustible gas leakage detector, including:

[0006] A first gas sensor for measuring the concentration of combustible gas below a predetermined concentration;

[0007] And a second gas sensor for measuring the concentration of combustible gas above a predetermined concentration;

[0008] The first gas sensor and / or the second gas sensor can also be used to measure the concentration of combustible gas equal to the predetermined concentration;

[0009] Wherein the first gas sensor is one of a thermal catalytic sensor, a laser sensor, and a photoacoustic spectroscopy sensor, and the second gas sensor is a laser sensor or an infrared sensor;

[0010] The combined combustible gas leak detector further includes a main body housing, a sampling gooseneck tube, a sampling head, a circuit board and a battery. The battery is connected to the circuit board. The first gas sensor and the second gas sensor are both arranged inside the main body housing. An internal pipeline and a gas pump arranged on the internal pipeline are further provided inside the main body housing. The first gas sensor and the second gas sensor are respectively arranged on the internal pipeline. The gas pump, the first gas sensor and the second gas sensor are respectively connected to the circuit board. One end of the sampling gooseneck tube is connected to the sampling head, and the other end is connected to the internal pipeline.

[0011] An embodiment of the present invention further provides a combined combustible gas leak detector, including:

[0012] A first gas sensor for measuring the concentration of combustible gas below a predetermined concentration;

[0013] And a second gas sensor for measuring the concentration of combustible gas above a predetermined concentration;

[0014] The first gas sensor and / or the second gas sensor can also be used to measure the concentration of combustible gas equal to the predetermined concentration;

[0015] Wherein the first gas sensor is one of a thermal catalytic sensor, a laser sensor and a photoacoustic spectroscopy sensor, and the second gas sensor is a laser sensor or an infrared sensor;

[0016] The combined combustible gas leak detector further includes a main body housing, a handheld housing, an intake pipeline and a signal line; the first gas sensor is fixed to the handheld housing, and the second gas sensor is arranged inside the main body housing, or the second gas sensor is fixed to the handheld housing, and the first gas sensor is arranged inside the main body housing; one end of the intake pipeline is connected to the first gas sensor, and the other end is connected to the second gas sensor; the signal line is connected to the first gas sensor and the second gas sensor for outputting a detection signal; the combined combustible gas leak detector is a portable handheld combined combustible gas leak detector.

[0017] The beneficial effects brought by the technical solution provided by the embodiment of the present utility model are as follows: A combined combustible gas leakage detector of the present utility model detects low-concentration combustible gas through a first gas sensor suitable for detecting low-concentration combustible gas, and at the same time detects high-concentration combustible gas through a second gas sensor suitable for detecting high-concentration combustible gas. By combining and configuring sensors based on multiple principles such as catalytic combustion, laser, infrared, and photoacoustic spectroscopy, a relatively wide range is covered, and the first gas sensor or the second gas sensor can be independently selected according to actual needs or adaptively selected by an algorithm to detect combustible gas, improving the detection accuracy and reliability, and avoiding false alarms and missed alarms. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a structural schematic block diagram of a combined combustible gas leakage detector provided by an embodiment of the present utility model;

[0019] Figure 2 is a structural schematic diagram of a combined combustible gas leakage detector provided by an embodiment of the present utility model;

[0020] Figure 3 is an internal structural schematic diagram of a combined combustible gas leakage detector provided by an embodiment of the present utility model;

[0021] Figure 4 is another internal structural schematic diagram of a combined combustible gas leakage detector provided by an embodiment of the present utility model;

[0022] Figure 5 is an internal structural schematic diagram of a combined combustible gas leakage detector provided by another embodiment of the present utility model.

[0023] In the figure: First gas sensor 1; Second gas sensor 2; Main body housing 3; Sampling gooseneck tube 4; Sampling head 5; Internal pipeline 6; Air pump 7; Handheld housing 8; Gas-electric hybrid wire 9; Measuring gas chamber 10; Gas diffusion hole 11; First holding part 12; Second holding part 13. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] To make the objectives, technical solutions, and advantages of the present utility model clearer, the embodiments of the present utility model will be further described below in conjunction with the accompanying drawings. The following describes a relatively optimal one among multiple possible embodiments of the present utility model, aiming to provide a basic understanding of the present utility model, but not aiming to identify the key or decisive elements of the present utility model or limit the scope to be protected.

[0025] In all the examples shown and discussed here, any specific value should be construed as merely exemplary and not as a limitation. Therefore, other examples of the exemplary embodiments may have different values.

[0026] Technologies, methods, and devices known to those of ordinary skill in the relevant art may not be discussed in detail, but where appropriate, such technologies, methods, and devices shall be regarded as part of the specification.

[0027] It should be noted that like reference numerals and letters indicate like items in the following figures. Therefore, once an item is defined in one figure, it does not need to be further discussed in subsequent figures. At the same time, it should be understood that, for the sake of convenience of description, the dimensions of the various parts shown in the figures are not drawn in actual proportional relationships.

[0028] It should be noted that unless otherwise clearly specified and defined, the terms "installed" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0029] Please refer to Figure 1 , embodiments of the present utility model provide a combined combustible gas leakage detector, mainly including:

[0030] A first gas sensor 1, which is used to measure the concentration of combustible gas below a predetermined concentration;

[0031] And a second gas sensor 2, which is used to measure the concentration of combustible gas above a predetermined concentration;

[0032] The first gas sensor 1 and / or the second gas sensor 2 can also be used to measure the concentration of combustible gas equal to the predetermined concentration;

[0033] Wherein the first gas sensor 1 is one of a thermal catalytic sensor, a laser sensor, and a photoacoustic spectroscopy sensor, and the second gas sensor 2 is a laser sensor or an infrared sensor.

[0034] Hereinafter, methane is taken as an example of combustible gas for illustration.

[0035] The thermal catalytic sensor utilizes the principle of the thermal effect of catalytic combustion. In one example, the thermal catalytic sensor consists of a detection element and a compensation element paired to form a measuring bridge. Under certain temperature conditions, the combustible gas undergoes flameless combustion on the surface of the detection element carrier and under the action of the catalyst, the carrier temperature rises, and the platinum wire resistance inside it also rises accordingly, causing the balanced bridge to lose balance and output an electrical signal proportional to the concentration of the combustible gas. The measurement range of the thermal catalytic sensor in this embodiment is suitable for detecting low-concentration methane, specifically 0-0.15%vol. In this way, the service life of the thermal catalytic sensor can be minimized as much as possible through the range, thereby improving the service life of the combustible gas leak detector.

[0036] The laser sensor detects the methane concentration by measuring the absorption of methane in a specific wavelength laser. The laser sensor can be adjusted by the optical path to be suitable for detecting low-concentration and high-concentration methane respectively. When it is low concentration, it can be specifically 0 %vol-0.15%vol, and when it is high concentration, it can be specifically 0.15%vol-100%vol.

[0037] The infrared sensor utilizes the absorption characteristics of methane molecules to infrared light and detects the methane concentration by measuring the absorption intensity of the infrared light. Due to the different optical paths of the infrared sensor, the corresponding gas chamber lengths are also different, and the measurement ranges of the infrared sensor are also different. When it is low concentration, it can be specifically 0 %vol-0.15%vol, and when it is high concentration, it can be specifically 0.15%vol-100%vol, which is suitable for detecting low-concentration methane and high-concentration methane.

[0038] The photoacoustic spectroscopy sensor utilizes the principle that methane generates sound waves after absorbing light and detects the methane concentration by measuring the sound wave intensity. The measurement range of the photoacoustic spectroscopy sensor is suitable for detecting low-concentration methane, specifically 0 %vol-0.15%vol.

[0039] In this way, when detecting low-concentration methane, the first gas sensor 1 is used for detection; while when detecting high-concentration methane, it is switched to the second gas sensor 2 for detection, achieving a relatively wide range coverage and greatly improving the measurement range. And the first gas sensor 1 or the second gas sensor 2 can be autonomously selected according to the actual methane concentration to be detected or adaptively selected by the algorithm to detect methane, improving the detection accuracy and reliability and avoiding false alarms and missed alarms. For example, a predetermined concentration can be set as a threshold, and one of the first gas sensor 1 and the second gas sensor 2 is preferentially started. When the concentration shows a changing trend until it is higher / lower than the predetermined concentration threshold, the other one is automatically started; or the first gas sensor 1 and the second gas sensor 2 operate alternately.

[0040] It should be noted that the measurement ranges of the first gas sensor 1 and the second gas sensor 2 cover 0 - 100% vol, and the predetermined concentration is 0.15% vol. The overall measurement range of this combined combustible gas leakage detector covers 0 - 100% vol, which expands the measurement range and meets the requirements of various application scenarios such as pipeline air leakage emergency repair, leakage inspection, household inspection, mine gas detection, and underground pipeline leakage detection. Considering the measurement ranges of various sensors, the predetermined concentration is set to 0.15% vol, which can more accurately switch the first gas sensor 1 and the second gas sensor 2 to detect low-concentration methane and high-concentration methane respectively.

[0041] As Figure 2 shown, some embodiments of the present invention also provide a combined combustible gas leakage detector, which further includes a main body housing 3, a sampling gooseneck tube 4, a sampling head 5, a circuit board and a battery. The battery is connected to the circuit board. The first gas sensor 1 and the second gas sensor 2 are both arranged inside the main body housing 3. An internal pipeline 6 and a gas pump 7 arranged on the internal pipeline 6 are further provided inside the main body housing 3. The first gas sensor 1 and the second gas sensor 2 are respectively arranged on the internal pipeline 6. The gas pump 7, the first gas sensor 1 and the second gas sensor 2 are respectively connected to the circuit board. One end of the sampling gooseneck tube 4 is connected to the sampling head 5, and the other end is connected to the internal pipeline 6.

[0042] Place the sampling head 5 in the detection area, and pump the gas to be detected in the detection area to the sampling gooseneck tube 4 through the gas pump 7, and then sequentially input it into the first gas sensor 1 and the second gas sensor 2 along the internal pipeline 6. If low-concentration methane detection is to be carried out, it is directly detected by the first gas sensor 1; while for high-concentration methane detection, the second gas sensor 2 is used to detect the gas to be detected.

[0043] One of the first gas sensor 1 and the second gas sensor 2 is a thermal catalytic sensor or a photoacoustic spectroscopy sensor, and the other is a laser sensor or an infrared sensor.

[0044] Since the volume of the thermal catalytic sensor or the photoacoustic spectroscopy sensor for low-concentration methane detection is small, and the volume of the laser sensor or the infrared sensor for high-concentration methane detection is small, the volume of the main body housing 3 can be made as small as possible in this way.

[0045] Exemplarily, as Figure 3 shown in the combined combustible gas leakage detector, the first gas sensor 1 is a thermal catalytic sensor, and the second gas sensor 2 is a laser sensor or an infrared sensor. As Figure 4As shown, the first gas sensor 1 is a photoacoustic spectroscopy sensor, and the second gas sensor 2 is a laser sensor or an infrared sensor.

[0046] Furthermore, the combined combustible gas leakage detector further includes a control switch, which is respectively connected to the first gas sensor 1 and the second gas sensor 2 and is used to switch the operation of the first gas sensor 1 and the second gas sensor 2;

[0047] And / or, it further includes a display screen and a circuit board. The circuit board is connected to the first gas sensor 1, the second gas sensor 2, and the display screen. The display screen is used to display the measurement results of the first gas sensor 1 and the second gas sensor 2.

[0048] Wherein, when detecting low-concentration methane, the control switch controls the first gas sensor 1 to start and the second gas sensor 2 to close; when detecting high-concentration methane, the second gas sensor 2 is controlled to start and the first gas sensor 1 is closed. In this way, the control switch can select a suitable gas sensor according to the actual methane detection requirements, reduce energy consumption and extend the working time while achieving accurate detection. The display screen can display the measurement results of the first gas sensor 1 and the second gas sensor 2, so that the change of methane concentration can be observed in real time through the display screen.

[0049] See Figure 5 , another embodiment of the present invention provides another combined combustible gas leakage detector, which further includes a main body housing 3, a handheld housing 8, an intake pipeline and a signal line; the first gas sensor 1 is fixed to the handheld housing 8, and the second gas sensor 2 is arranged in the main body housing 3; one end of the intake pipeline is connected to the first gas sensor 1 and the other end is connected to the second gas sensor 2, and the signal line is connected to the first gas sensor 1 and the second gas sensor 2 for outputting detection signals; the combined combustible gas leakage detector is a portable handheld combined combustible gas leakage detector.

[0050] In this way, the first gas sensor 1 and the second gas sensor 2 are respectively placed in two housings, which can avoid centralized placement when the sensors are heavy, thus facilitating carrying.

[0051] It should be noted that in this embodiment, "the first gas sensor 1 is fixed to the handheld housing 8 and the second gas sensor 2 is arranged in the main body housing 3" is taken as an example for illustration, but it can also be "the second gas sensor is fixed to the handheld housing and the first gas sensor is arranged in the main body housing", which will not be elaborated here.

[0052] When detecting methane, hold the handheld housing 8 and place the first gas sensor 1 in the area to be detected for detection. If detecting low-concentration methane, it can be directly detected by the first gas sensor 1. When detecting high-concentration methane, the gas to be measured is input into the second gas sensor 2 in the main housing 3 through the intake pipeline, and the second gas sensor 2 is used to detect the gas to be measured. The intake pipeline can be a flexible hose, and the signal line can be integrated with the intake pipeline to form a gas-electric hybrid line 9, and the detection signals of the first gas sensor 1 and the second gas sensor 2 are output through the signal line.

[0053] Preferably, the first gas sensor 1 is fixed to the handheld housing 8, and a part of the measuring gas chamber 10 of the first gas sensor 2 is located outside the handheld housing 8 and a part is located inside the handheld housing 8; or, the first gas sensor is fixed to the main housing, and a part of the measuring gas chamber of the first gas sensor is located outside the main housing and a part is located inside the main housing. A part of the measuring gas chamber 10 is located inside the handheld housing / main housing, reducing the combined volume of the handheld housing / main housing and the measuring gas chamber 10, which is convenient for carrying.

[0054] For example, the measuring gas chamber 10 can be set in a cylindrical shape, the rear end of the measuring gas chamber 10 is fixedly connected to the handheld housing 8 and extends into the handheld housing 8, and the front end extends outside the handheld housing 8.

[0055] When the first gas sensor 1 is fixed to the handheld housing 8, gas diffusion holes 11 are provided on the outer wall of the part of the measuring gas chamber 10 of the first gas sensor 1 that is located outside the handheld housing 8. When detecting low-concentration methane, the gas to be measured directly enters the measuring gas chamber 10 for detection. The gas diffusion holes 11 are preferably provided at the front of the measuring gas chamber 10, such as on the side wall of the measuring gas chamber 10. The shape of the gas diffusion holes 11 can be flexibly set, such as in a long strip shape. The gas diffusion holes 11 facilitate the gas to be measured to enter the measuring gas chamber 10 in a timely and rapid manner.

[0056] It should be noted that considering that a part of the measuring gas chamber 10 of the first gas sensor 1 needs to be arranged outside the handheld housing 8. The first gas sensor 1 generally selects a low-range laser sensor, and the corresponding second gas sensor 2 selects a high-range laser sensor or an infrared sensor. Here, the low-range laser sensor and the high-range laser sensor are respectively laser sensors with different optical paths, and due to their different optical paths, the corresponding gas chamber lengths are also different.

[0057] The handheld housing 8 has a first gripping portion 12 for gripping. The first gripping portion 12 is for a user to hold the handheld housing 8 with a hand and place the measurement gas chamber 10 in the area to be detected. The shape of the first gripping portion 12 can be flexibly set according to the application scenario, such as being set in the shape of a gun handle for easy gripping.

[0058] In other embodiments (not illustrated), a partial measurement gas chamber of the first gas sensor is provided inside the handheld housing corresponding to the first gripping portion, that is, the portion equivalent to the gripping also holds a partial measurement gas chamber of the first gas sensor, which can further reduce the volume of the handheld housing.

[0059] In addition, the combined combustible gas leak detector of this embodiment may also include a battery, an air pump 7, and a circuit board. The battery, the air pump 7, and the signal line are all connected to the circuit board. Among them, the second gas sensor 2 is disposed in the main body housing 3, and the battery, the air pump 7, and the circuit board are all disposed in the main body housing 3, or the second gas sensor is disposed in the handheld housing, and the battery, the air pump, and the circuit board are all disposed in the handheld housing; the air pump 7 is used to pump the gas to be detected to the first gas sensor 1 and the second gas sensor 2; and / or, the main body housing 3 has a second gripping portion 13.

[0060] The air pump 7 and the second gas sensor 2 can be integrated on the circuit board. The battery powers the circuit board. The battery can be a rechargeable battery. The circuit board is provided with a USB interface for convenient data transmission and charging. The air pump 7 is connected to the second gas sensor 2 through a pipeline. The gas to be detected can be pumped to first enter the first gas sensor 1 and then be transported to the second gas sensor 2 through the intake pipeline. One of the first gas sensor 1 and the second gas sensor 2 detects the gas to be detected passing by. A user can hold the first gripping portion 12 with one hand and hold the second gripping portion 13 with the other hand for easy operation.

[0061] In this article, the front, back, up, down and other orientation words are defined based on the positions of the components in the drawings and the positions of the components relative to each other, only for the sake of clarity and convenience of expressing the technical solution. It should be understood that they are relative concepts and can change accordingly according to different usage and placement methods. The use of the orientation words should not limit the scope of protection claimed in this application.

[0062] Without conflict, the above embodiments and the features in the embodiments in this article can be combined with each other. The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A combined combustible gas leak detector, characterized in that: include: A first gas sensor for measuring the concentration of combustible gas below a predetermined concentration; and a second gas sensor for measuring a concentration of combustible gas above a predetermined concentration; The first gas sensor and / or the second gas sensor may also be used to measure the concentration of combustible gas equal to a predetermined concentration; The first gas sensor is one of a thermal catalytic sensor, a laser sensor and a photoacoustic spectroscopy sensor, and the second gas sensor is a laser sensor or an infrared sensor; The combined combustible gas leak detector also includes a main shell, a sampling gooseneck, a sampling head, a circuit board and a battery. The battery is connected to the circuit board. The first gas sensor and the second gas sensor are both arranged in the main shell. An internal pipeline and an air pump arranged on the internal pipeline are also provided inside the main shell. The first gas sensor and the second gas sensor are respectively arranged on the internal pipeline. The air pump, the first gas sensor and the second gas sensor are respectively connected to the circuit board. One end of the sampling gooseneck is connected to the sampling head, and the other end is connected to the internal pipeline.

2. A combined combustible gas leak detector as claimed in claim 1, characterized in that: One of the first gas sensor and the second gas sensor is a thermocatalytic sensor or a photoacoustic spectroscopic sensor, and the other is a laser sensor or an infrared sensor.

3. A combined combustible gas leak detector, characterized in that: include: A first gas sensor for measuring the concentration of combustible gas below a predetermined concentration; and a second gas sensor for measuring a concentration of combustible gas above a predetermined concentration; The first gas sensor and / or the second gas sensor may also be used to measure the concentration of combustible gas equal to a predetermined concentration; The first gas sensor is one of a thermal catalytic sensor, a laser sensor and a photoacoustic spectroscopy sensor, and the second gas sensor is a laser sensor or an infrared sensor; The combined combustible gas leak detector also includes a main body shell, a handheld shell, an air intake pipe and a signal line; the first gas sensor is fixed to the handheld shell, and the second gas sensor is arranged in the main body shell, or the second gas sensor is fixed to the handheld shell, and the first gas sensor is arranged in the main body shell; one end of the air intake pipe is connected to the first gas sensor, and the other end is connected to the second gas sensor; the signal line connects the first gas sensor and the second gas sensor, and is used to output a detection signal; the combined combustible gas leak detector is a portable handheld combined combustible gas leak detector.

4. A combined combustible gas leak detector as claimed in claim 3, characterized in that: The first gas sensor is fixed to the handheld shell, and the measuring gas chamber of the first gas sensor is partially located outside the handheld shell and partially located inside the handheld shell; or, the first gas sensor is fixed to the main shell, and the measuring gas chamber of the first gas sensor is partially located outside the main shell and partially located inside the main shell.

5. A combined combustible gas leak detector as claimed in claim 4, characterized in that: The first gas sensor is fixed to the handheld housing; a gas diffusion hole is provided on a portion of the outer wall of the measuring gas chamber of the first gas sensor located outside the handheld housing.

6. A combined combustible gas leak detector as claimed in claim 3, characterized in that: The first gas sensor is fixed to the handheld shell, the handheld shell has a first gripping portion for holding, and a partial measurement chamber of the first gas sensor is provided inside the handheld shell corresponding to the first gripping portion; or, the first gas sensor is fixed to the main shell, the main shell has a first gripping portion for holding, and a partial measurement chamber of the first gas sensor is provided inside the main shell corresponding to the first gripping portion.

7. A combined combustible gas leak detector as claimed in claim 3, characterized in that: It also includes a battery, an air pump and a circuit board; the battery, the air pump and the signal line are all connected to the circuit board, wherein the second gas sensor is arranged in the main body shell, and the battery, the air pump and the circuit board are all arranged in the main body shell, or the second gas sensor is arranged in the handheld shell, and the battery, the air pump and the circuit board are all arranged in the handheld shell; the air pump is used to pump the gas to be tested to the first gas sensor and the second gas sensor; and / or the main body shell has a second gripping portion; and / or the first gas sensor is a laser sensor.

8. A combined combustible gas leak detector as claimed in claim 1 or 3, characterized in that: Also included is a control switch, which is connected to the first gas sensor and the second gas sensor respectively, and is used to switch the first gas sensor and the second gas sensor to work; And / or, it also includes a display screen and a circuit board, wherein the circuit board is connected to the first gas sensor, the second gas sensor and the display screen, and the display screen is used to display the measurement results of the first gas sensor and the second gas sensor.

9. A combined combustible gas leak detector as claimed in claim 1 or 3, characterized in that: The measurement ranges of the first gas sensor and the second gas sensor cover 0-100% vol; the predetermined concentration is 0.15% vol.

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