Gas detector

Abstract

The utility model relates to the technical field of gas detection, and discloses a gas detector. Wherein the gas detector comprises a probe nozzle, a probe, a gas detection sensor and a filter element, and the probe nozzle is provided with a gas inlet hole; the probe is connected to the probe nozzle and provided with a detection cavity, one end of the detection cavity is communicated with the air inlet, and the other end is communicated with the air pump; the gas detection sensor is arranged in the detection cavity and is used for detecting gas; the filter element is arranged between the gas inlet hole and the detection cavity and is used for filtering impurities in the gas. The filter element not only can ensure that detected gas can smoothly enter the detection cavity, but also does not need to worry that a gas circuit, a gas pump, a gas detection sensor and the like suck dust and impurities to be blocked and polluted, so that the service life of the gas detection sensor is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of gas detection, in particular to a gas detector. Background Art

[0002] In our daily life, the use of gas is very frequent. The prior art uses an inhalation-type combustible gas detection alarm to detect combustible gas.

[0003] The gas path system of the inhalation-type combustible gas detection alarm is one of its core components. Due to the complexity of the working environment, the gas path system often has to face the invasion of various impurities such as dust and particulate matter. If the alarm does not have effective protection measures or the protection measures are simple, these impurities can easily enter the gas path system, causing gas path blockage or sensor contamination, and thus affecting the accuracy of the detection results.

[0004] Based on this, there is an urgent need for a gas detector to solve the above problems. Summary of the Utility Model

[0005] Based on the above, the purpose of the utility model is to provide a gas detector, which can not only ensure that the gas to be detected can smoothly enter the detection cavity, but also does not have to worry about the inhalation of dust and impurities by the gas path, air pump, gas detection sensor, etc. being blocked and contaminated, and improves the service life of the gas detection sensor.

[0006] To achieve the above object, the utility model adopts the following technical solutions:

[0007] A gas detector, comprising:

[0008] A probe nozzle, which is provided with an air inlet hole;

[0009] A probe, which is connected to the probe nozzle. The probe is provided with a detection cavity. One end of the detection cavity communicates with the air inlet hole, and the other end communicates with an air pump;

[0010] A gas detection sensor, which is arranged in the detection cavity. The gas detection sensor is used for detecting gas;

[0011] A filter element, which is arranged between the air inlet hole and the detection cavity. The filter element is used for filtering impurities in the gas.

[0012] As a preferred technical solution of a gas detector, one end of the probe nozzle facing the probe is provided with an installation groove. The air inlet hole is arranged at the bottom of the installation groove. The filter element is embedded in the installation groove. The first end of the probe is threadedly connected to the side wall of the installation groove, and the first end of the probe and the bottom of the installation groove abut against both ends of the filter element.

[0013] As a preferred technical solution of a gas detector, the gas detector further includes a waterproof and breathable membrane, and the waterproof and breathable membrane is disposed between the filter element and the detection chamber.

[0014] As a preferred technical solution of a gas detector, the waterproof and breathable membrane is connected to one end of the probe near the nozzle.

[0015] As a preferred technical solution of a gas detector, a positioning groove is provided at one end of the probe near the nozzle, the waterproof and breathable membrane is embedded in the positioning groove, and the waterproof and breathable membrane is bonded to the bottom of the positioning groove.

[0016] As a preferred technical solution of a gas detector, the probe is further provided with a first air hole communicating with the detection chamber, the detection chamber communicates with the air inlet hole through the first air hole, and the waterproof and breathable membrane is connected to the end face of one end of the first air hole near the detection chamber.

[0017] As a preferred technical solution of a gas detector, the gas detector further includes a probe base, the second end of the probe is connected to the probe base, a guide air pipe is arranged in the probe base, one end of the guide air pipe communicates with the air pump, and the other end communicates with the detection chamber.

[0018] As a preferred technical solution of a gas detector, the gas detector further includes a sensor base, the probe base is provided with a stepped hole, the stepped hole includes a large-diameter section, a stepped surface and a small-diameter section, a first flange is arranged on the side wall of the sensor base, one end of the sensor base is connected to the gas detection sensor, the other end partially extends into the small-diameter section, the second end of the probe is threadedly connected to the large-diameter section, and the second end of the probe and the stepped surface abut against the first flange.

[0019] As a preferred technical solution of a gas detector, a first sealing ring is arranged between the first flange and the stepped surface.

[0020] As a preferred technical solution of a gas detector, a second flange is arranged on the side wall of the probe, and a second sealing ring is arranged between the second flange and the end face of the nozzle; and / or

[0021] A third sealing ring is arranged between the second flange and the end face of the probe base.

[0022] The beneficial effects of the present utility model are:

[0023] The present utility model provides a gas detector. During operation, an air pump draws air, and the gas sequentially enters the detection cavity through the air inlet hole and the filter element. The gas in the detection cavity is detected by a gas detection sensor. Among them, when the gas flows through the filter element, the filter element can filter out impurities in the gas, filtering out most of the dust impurities and other solid particles, preventing impurities in the gas from entering the detection cavity. This filter element can not only ensure that the gas to be detected can smoothly enter the detection cavity, but also eliminate the worry that the air path, air pump, gas detection sensor, etc. will be blocked and contaminated by inhaled dust impurities, thereby extending the service life of the gas detection sensor. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model, the following will briefly introduce the drawings required for the description of the embodiments of the present utility model. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained according to the content of the embodiments of the present utility model and these drawings.

[0025] Figure 1 is one of the cross-sectional views of the gas detector provided by the specific embodiment of the present utility model;

[0026] Figure 2 is the second cross-sectional view of the gas detector provided by the specific embodiment of the present utility model.

[0027] The reference signs in the drawings are as follows:

[0028] 1, probe nozzle; 11, installation groove; 12, air inlet hole;

[0029] 2, probe head; 21, detection cavity; 22, first air hole; 23, first flange;

[0030] 3, gas detection sensor;

[0031] 4, filter element;

[0032] 5, waterproof and breathable membrane;

[0033] 6, probe head seat; 61, stepped hole; 611, large diameter section; 612, stepped surface; 613, small diameter section;

[0034] 7, air duct;

[0035] 8, sensor seat; 81, first flange; 82, second air hole;

[0036] 91, first sealing ring; 92, second sealing ring; 93, third sealing ring. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] The present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the present utility model, rather than limiting the present utility model. In addition, it should be noted that for the convenience of description, only the parts related to the present utility model rather than all the structures are shown in the drawings.

[0038] In the description of the present utility model, unless otherwise clearly defined and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; 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 or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present utility model can be understood according to specific situations.

[0039] In the present utility model, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature may include the direct contact between the first and second features, or may include the situation where the first and second features are not in direct contact but in contact through other features between them. Moreover, the first feature being "above", "above", and "on" the second feature includes that the first feature is directly above and obliquely above the second feature, or only indicates that the horizontal height of the first feature is higher than that of the second feature. The first feature being "below", "below", and "under" the second feature includes that the first feature is directly below and obliquely below the second feature, or only indicates that the horizontal height of the first feature is less than that of the second feature.

[0040] In the description of this embodiment, the orientation or positional relationships such as "above", "below", "left", and "right" are based on the orientation or positional relationships shown in the drawings. It is only for the convenience of description and simplifying the operation, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation to the present utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meanings.

[0041] As Figure 1 shown, this embodiment provides a gas detector, which includes a probe nozzle 1, a probe head 2, a gas detection sensor 3, and a filter element 4. The probe nozzle 1 is provided with an air inlet hole 12; the probe head 2 is connected to the probe nozzle 1, and the probe head 2 is provided with a detection cavity 21. One end of the detection cavity 21 communicates with the air inlet hole 12, and the other end communicates with an air pump; the gas detection sensor 3 is arranged in the detection cavity 21, and the gas detection sensor 3 is used to detect gas; the filter element 4 is arranged between the air inlet hole 12 and the detection cavity 21, and the filter element 4 is used to filter impurities in the gas. In this embodiment, the filter element 4 is a filter cotton core, which can block dust impurities from entering and causing blockage and pollution inside.

[0042] During operation, the air pump sucks air, and the gas sequentially enters the detection chamber 21 through the air inlet hole 12 and the filter element 4, and the gas detection sensor 3 in the detection chamber 21 is used to detect the gas. Among them, when the gas flows through the filter element 4, the filter element 4 can filter out impurities in the gas, filtering out most of the dust impurities and other solid particles, preventing impurities in the gas from entering the detection chamber 21. This filter element 4 can not only ensure that the gas to be detected can smoothly enter the detection chamber 21, but also eliminate the worry that the air path, air pump, gas detection sensor 3, etc. will be blocked and contaminated by inhaled dust impurities, thus increasing the service life of the gas detection sensor 3.

[0043] In this embodiment, the gas to be detected is a combustible gas, and the detection of the combustible gas by the gas detection sensor 3 is a prior art, which will not be elaborated here.

[0044] Further, an installation groove 11 is provided at one end of the probe 1 facing the probe 2, the air inlet hole 12 is provided at the bottom of the installation groove 11, the filter element 4 is embedded in the installation groove 11, the first end of the probe 2 is threadedly connected to the side wall of the installation groove 11, and the first end of the probe 2 and the bottom of the installation groove 11 abut against both ends of the filter element 4, realizing the detachable installation of the filter element 4 in the installation groove 11. Since the filter element 4 is a consumable, the structure in which the first end of the probe 2 is threadedly connected to the side wall of the installation groove 11 can quickly realize the disassembly and assembly of the probe 2 and the probe 1, facilitating the replacement of the filter element 4 that has reached the service life, and the operation is simple.

[0045] In the prior art, as the power source of the suction-type combustible gas detector, the working stability of the air pump directly affects the overall performance of the detector. However, in a humid and dusty environment, the air pump is easily corroded by liquid and invaded by dust impurities, resulting in performance degradation or damage. Once the air pump fails, the detector will not work properly, and even may cause safety accidents. Preferably, the gas detector further includes a waterproof breathable membrane 5, and the waterproof breathable membrane 5 is disposed between the filter element 4 and the detection chamber 21. The gas sequentially enters the detection chamber 21 through the air inlet hole 12, the filter element 4 and the waterproof breathable membrane 5. When the gas passes through the waterproof breathable membrane 5, the waterproof breathable membrane 5 can effectively block the inflow of liquid while not affecting the inflow of gas, preventing the gas detection sensor 3 from being corroded and the air pump from being damaged.

[0046] In this embodiment, the waterproof and breathable membrane 5 is connected to one end of the probe 2 close to the probe tip 1. Specifically, a positioning groove is provided at one end of the probe 2 close to the probe tip 1, and the waterproof and breathable membrane 5 is embedded in the positioning groove. The positioning groove can provide installation positioning for the waterproof and breathable membrane 5, and the waterproof and breathable membrane 5 is bonded to the bottom of the positioning groove, realizing the connection of the waterproof and breathable membrane 5 to one end of the probe 2 close to the probe tip 1. On the one hand, when the air pump pumps air, a negative pressure is generated on the side of the waterproof and breathable membrane 5 close to the detection cavity 21. Under the action of the negative pressure, the waterproof and breathable membrane 5 can be stably connected to one end of the probe 2 close to the probe tip 1; on the other hand, when the waterproof and breathable membrane 5 needs to be replaced, only the probe tip 1 needs to be disassembled from the probe 2, and then the waterproof and breathable membrane 5 can be replaced. The operation is simple, increasing the operation convenience.

[0047] In other embodiments, as Figure 2 shown, the probe 2 is further provided with a first air hole 22 communicating with the detection cavity 21. The detection cavity 21 communicates with the air inlet hole 12 through the first air hole 22, and the waterproof and breathable membrane 5 is connected to the end face of one end of the first air hole 22 close to the detection cavity 21. During operation, gas can enter the detection cavity 21 through the air inlet hole 12, the filter element 4, the first air hole 22 and the waterproof and breathable membrane 5. And the waterproof and breathable membrane 5 and the filter element 4 are arranged at intervals to prevent the filter element 4 from contaminating the waterproof and breathable membrane 5.

[0048] In this embodiment, as Figure 1 shown, the gas detector further includes a probe base 6. The second end of the probe 2 is connected to the probe base 6. A gas guide pipe 7 is arranged in the probe base 6. One end of the gas guide pipe 7 communicates with the air pump, and the other end communicates with the detection cavity 21. During operation, the air pump pumps air, and the air pump communicates with the detection cavity 21 through the gas guide pipe 7.

[0049] Furthermore, the gas detector further includes a sensor base 8. The probe base 6 is provided with a stepped hole 61. The stepped hole 61 includes a large-diameter section 611, a stepped surface 612 and a small-diameter section 613. A first flange 81 is provided on the side wall of the sensor base 8. One end of the sensor base 8 is connected to the gas detection sensor 3, and the other end partially extends into the small-diameter section 613. The second end of the probe 2 is threadedly connected to the large-diameter section 611, and the second end of the probe 2 and the stepped surface 612 abut against the first flange 81. During assembly, the second end of the probe 2 is threadedly connected to the large-diameter section 611 of the probe base 6 until the second end of the probe 2 and the stepped surface 612 abut against the first flange 81, realizing the assembly among the probe 2, the sensor base 8 and the probe base 6.

[0050] Further, the sensor base 8 is further provided with a second air hole 82. The detection cavity 21, the second air hole 82, the gas guide pipe 7 and the air pump are communicated in sequence.

[0051] Preferably, a first sealing ring 91 is arranged between the first flange 81 and the stepped surface 612. The sealing between the sensor base 8 and the probe base 6 is realized.

[0052] Further preferably, a second flange 23 is provided on the side wall of the probe 2, and a second sealing ring 92 is provided between the second flange 23 and the end face of the probe tip 1, achieving the sealing between the probe 2 and the probe tip 1; and / or a third sealing ring 93 is provided between the second flange 23 and the end face of the probe base 6, achieving the sealing between the probe 2 and the probe base 6. In this embodiment, a second sealing ring 92 is provided between the second flange 23 and the end face of the probe tip 1, and a third sealing ring 93 is provided between the second flange 23 and the end face of the probe base 6.

[0053] Note that the above is only a preferred embodiment of the present invention and the technical principles applied. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, re-adjustments and substitutions can be made by those skilled in the art without departing from the protection scope of the present invention. Therefore, although the present invention has been described in more detail through the above embodiments, the present invention is not limited to the above embodiments only. Without departing from the concept of the present invention, more other equivalent embodiments can be included, and the scope of the present invention is determined by the scope of the appended claims.

Claims

1. A gas detector, characterized in that: include: A probe nozzle (1) provided with an air inlet hole (12); A probe (2) connected to the probe nozzle (1), the probe (2) being provided with a detection cavity (21), one end of the detection cavity (21) being connected to the air inlet (12), and the other end of the detection cavity (21) being connected to the air pump; A gas detection sensor (3), which is arranged in the detection chamber (21), and the gas detection sensor (3) is used to detect gas; A filter core (4) is arranged between the air inlet (12) and the detection chamber (21), and the filter core (4) is used to filter impurities in the gas.

2. The gas detector according to claim 1, characterized in that A mounting groove (11) is provided at one end of the probe nozzle (1) facing the probe head (2); the air inlet hole (12) is provided at the bottom of the mounting groove (11); the filter element (4) is embedded in the mounting groove (11); the first end of the probe head (2) is threadedly connected to the side wall of the mounting groove (11); and the first end of the probe head (2) and the bottom of the mounting groove (11) abut against two ends of the filter element (4).

3. The gas detector according to claim 1, characterized in that The gas detector further comprises a waterproof and breathable membrane (5), wherein the waterproof and breathable membrane (5) is arranged between the filter element (4) and the detection cavity (21).

4. The gas detector according to claim 3, characterized in that: The waterproof and breathable membrane (5) is connected to one end of the probe (2) close to the probe nozzle (1).

5. The gas detector according to claim 4, characterized in that: A positioning groove is provided at one end of the probe (2) close to the probe nozzle (1), the waterproof and breathable membrane (5) is embedded in the positioning groove, and the waterproof and breathable membrane (5) is bonded to the bottom of the positioning groove.

6. The gas detector according to claim 4, characterized in that: The probe (2) is further provided with a first air hole (22) connected to the detection cavity (21); the detection cavity (21) is connected to the air inlet (12) via the first air hole (22); and the waterproof breathable membrane (5) is connected to an end surface of the first air hole (22) close to one end of the detection cavity (21).

7. The gas detector according to claim 1, characterized in that: The gas detector further comprises a probe seat (6), the second end of the probe (2) being connected to the probe seat (6), an air guide tube (7) being arranged in the probe seat (6), one end of the air guide tube (7) being connected to the air pump, and the other end of the air guide tube (7) being connected to the detection chamber (21).

8. The gas detector according to claim 7, characterized in that: The gas detector further comprises a sensor seat (8), the probe seat (6) being provided with a stepped hole (61), the stepped hole (61) comprising a large diameter section (611), a stepped surface (612) and a small diameter section (613), a side wall of the sensor seat (8) being provided with a first flange (81), one end of the sensor seat (8) being connected to the gas detection sensor (3), and the other end partially extending into the small diameter section (613), the second end of the probe (2) being threadedly connected to the large diameter section (611), and the second end of the probe (2) and the stepped surface (612) being pressed against the first flange (81).

9. The gas detector according to claim 8, characterized in that: A first sealing ring (91) is provided between the first flange (81) and the stepped surface (612).

10. The gas detector according to claim 7, characterized in that: The side wall of the probe (2) is provided with a second flange (23), and a second sealing ring (92) is provided between the second flange (23) and the end surface of the probe nozzle (1); and / or A third sealing ring (93) is provided between the second flange (23) and the end surface of the probe seat (6).

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