A gas detector

Abstract

The utility model provides a kind of gas detector, belong to gas detection technical field, solve the problem that existing technology is easily pulled lead when replacing sensor, and further easily lead to gas detector damage. It includes meter head, the meter head is threadedly connected with sensor upper casing, sensor upper casing is threadedly connected with sensor lower casing, sensor upper casing is fixedly provided with female seat, female seat is inserted with sensor, and sensor is movably arranged in sensor lower casing, the thread hole that the meter head is opened has along the radial arrangement of sensor upper casing, and the thread hole is threadedly provided with the tight screw that abuts against sensor upper casing. Setting tight screw thread passes through thread hole and abuts against the outer wall of sensor upper casing, limit the rotation of sensor upper casing, ensure that sensor upper casing does not rotate when sensor lower casing is disassembled, effectively protect lead, avoid gas detector damage.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the gas detection technical field, specifically belongs to a kind of gas detector. BACKGROUND

[0002] Gas detector is a kind of instrument for detecting gas concentration.The instrument is suitable for dangerous place where combustible or toxic gas exists, can long-term continuously detect the content of measured gas in air within lower limit of explosion, and is widely used in gas, petrochemical industry, metallurgy, steel, coking, power and other industries where combustible or toxic gas exists.

[0003] Gas detector can monitor a variety of gases, such as combustible gas: natural gas, liquefied gas, coal gas, acetylene, pentane, alkyne, alkene, alcohol, acetone, toluene, alcohol, hydrocarbon, light oil and other liquid vapor; Toxic gas: carbon monoxide, hydrogen sulfide, ammonia, chlorine, oxygen, phosphine, sulfur dioxide, hydrogen chloride, chlorine dioxide and other toxic and harmful gases. When detecting different gases, the gas detector needs to replace the sensor in a more efficient and fast way. The gas detector on the market has a replaceable sensor shell structure, for example, the patent with publication number CN208476895U discloses a gas detector based on sensor off-site calibration function, mainly composed of front cover, veneer, circuit board, middle shaft, rear cover, threaded column, probe upper shell, socket connecting plate, circuit board plastic shell, plug connecting plate, sensor board, sensor plastic shell and probe lower shell. The circuit board is fixed on the middle shaft by threaded column and hexagonal nut, and the veneer is fixed on the middle shaft by screw. The sensor board and plug connecting plate are fixed in the circuit board plastic shell and sensor plastic shell respectively after being welded by board-on pin, to form a universal replaceable sensor assembly. The sensor assembly of the gas detector adopts a replaceable plug-in universal structure, which is suitable for all detectors of the same type, realizes off-site calibration and parameter operation function requirements of the detector, and only needs to calibrate and set the sensor assembly in the laboratory, without further on-site operation and calibration of each instrument.

[0004] In the above prior art, the probe upper shell and the probe lower shell are threadedly connected, and the probe upper shell is threadedly connected with the middle shaft. When replacing the sensor, the probe lower shell needs to be unscrewed. During the process of unscrewing the probe lower shell, the probe upper shell is easy to rotate with the probe lower shell, which pulls the wires in the probe upper shell, and further causes damage to the gas detector. UTILITY MODEL CONTENTS

[0005] The utility model discloses a gas detector, set up the fastening screw thread and pass through the thread hole and resist the outer wall of the sensor upper casing, limit the rotation of sensor upper casing, guarantee when disassembling sensor lower casing, sensor upper casing will not rotate with it, the wire is effectively protected, avoids gas detector damage.

[0006] The utility model discloses the technical scheme as follows: A kind of gas detector, including meter head, the meter head is threadedly connected with sensor upper casing, sensor upper casing is threadedly connected with sensor lower casing, sensor upper casing is fixedly provided with female seat, female seat is inserted with sensor, and sensor is movably arranged in sensor lower casing, the meter head is opened with the thread hole being arranged along the radial direction of sensor upper casing, and the fastening screw that is threadedly arranged in thread hole is abutted with sensor upper casing.

[0007] Preferably, an annular groove is formed on the sensor upper casing and aligned with the fastening screw.

[0008] Preferably, a first sealing ring is fitted on the sensor upper casing and cooperates with the meter head, and a second sealing ring is fitted on the sensor upper casing and cooperates with the sensor lower casing.

[0009] Preferably, the fastening screw is located between the first sealing ring and the second sealing ring.

[0010] Preferably, an annular sealing gasket is arranged in the sensor lower casing and abuts against the sensor.

[0011] Preferably, an explosion-proof sheet is arranged in the sensor lower casing, and a compression ring is threadedly connected in the sensor lower casing and used to compress the explosion-proof sheet.

[0012] Preferably, a groove is formed on the end face of the compression ring away from the explosion-proof sheet.

[0013] Preferably, a filter screen is arranged on the explosion-proof sheet and the compression ring.

[0014] Preferably, a hexagonal recess is formed on the tail of the fastening screw.

[0015] As described above, due to the adoption of the above technical scheme, the utility model has the following beneficial effects: The fastening screw is threadedly arranged in the thread hole and abuts against the outer wall of the sensor upper casing, limiting the rotation of the sensor upper casing, ensuring that the sensor upper casing will not rotate when the sensor lower casing is disassembled, effectively protecting the wire and avoiding damage to the gas detector. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those skilled in the art, other related drawings can also be obtained from these drawings without creative labor.

[0017] Fig. 1 The three-dimensional structure schematic diagram provided by the embodiment of the present application is shown in the figure. Fig. 2 Another perspective three-dimensional structure schematic diagram provided by the embodiment of the present application is shown in the figure. Fig. 3 A partial cross-sectional structure schematic diagram provided by the embodiment of the present application is shown in the figure.

[0018] Reference signs: 1 - meter head; 2 - sensor lower shell; 3 - threaded hole; 4 - first sealing ring; 5 - set screw; 6 - hexagonal groove; 7 - sensor upper shell; 8 - female seat; 9 - sensor; 10 - explosion-proof sheet; 11 - pressing ring; 12 - groove; 13 - annular groove; 14 - second sealing ring; 15 - male head; 16 - annular sealing gasket; 17 - filter screen. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some embodiments of the present application, not all the embodiments. The components of the embodiments of the present application described and shown in the drawings can be arranged and designed in various different configurations.

[0020] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of the present application.

[0021] In the description of the present application, it should be noted that if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship of the product in use, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0022] The following is combined with Figs. 1-3 This utility model will be described in detail.

[0023] Example A gas detector includes a meter head 1, a sensor upper housing 7 threadedly connected to the meter head 1, a sensor lower housing 2 threadedly connected to the sensor upper housing 7, a female seat 8 fixedly disposed in the sensor upper housing 7, a sensor 9 movably disposed in the sensor lower housing 2 inserted into the female seat 8, and a threaded hole 3 arranged radially along the sensor upper housing 7 on the meter head 1, with a set screw 5 threaded in the threaded hole 3 that abuts against the sensor upper housing 7.

[0024] Meter 1 is existing technology and is used to display gas concentration in real time. Sensor 9 is equipped with a male connector 15, which connects to female connector 8. Female connector 8 is connected to the display screen in meter 1 via wires. A set screw 5, threaded through a threaded hole 3, abuts against the outer wall of the upper sensor housing 7, restricting rotation of the upper sensor housing 7. This ensures that the upper sensor housing 7 will not rotate when the lower sensor housing 2 is removed, effectively protecting the wires and preventing damage to the gas detector.

[0025] The sensor housing 7 has an annular groove 13 aligned with the set screw 5. When the friction between the set screw 5 and the sensor housing 7 is insufficient to resist the rotation of the sensor housing 7, the axial displacement generated by the rotation of the sensor housing 7 forces the sidewall of the annular groove 13 to abut against the set screw 5, further restricting the rotation of the sensor housing 7. The two threads on the sensor housing 7 are located above and below the annular groove 13 to prevent the set screw 5 from damaging the thread structure and affecting the disassembly of the sensor housing 7.

[0026] The upper housing 7 of the sensor is fitted with a first sealing ring 4 that mates with the meter head 1 and a second sealing ring 14 that mates with the lower housing 2 of the sensor. The first sealing ring 4 can increase the sealing performance between the upper housing 7 of the sensor and the meter head 1, and the second sealing ring 14 can increase the sealing performance between the upper housing 7 of the sensor and the lower housing 2 of the sensor, preventing water ingress and ensuring the explosion-proof requirements of the gas detector.

[0027] The set screw 5 is located between the first sealing ring 4 and the second sealing ring 14, so that the set screw 5 and the threaded hole 3 do not affect the sealing and explosion-proof requirements of the gas detector.

[0028] An annular sealing gasket 16 is provided in the lower housing 2 of the sensor to abut against the sensor 9. The annular sealing gasket 16 can seal the gap at the lower end of the sensor 9, ensuring that the gas to be detected enters the sensor 9 for detection.

[0029] An explosion-proof disc 10 is installed in the lower housing 2 of the sensor, and a pressure ring 11 for pressing the explosion-proof disc 10 is threadedly connected to the lower housing 2. The explosion-proof disc 10 is made of stainless steel powder or metal wire mesh through high-temperature sintering and has a microporous structure (pore size 30-60μm). When an explosion occurs inside the detector due to circuit failure or gas leakage, the explosion-proof disc 10 can withstand the blast shock wave and block the flame propagation. The explosion-proof disc 10 is fixed in the lower housing 2 of the sensor by the pressure ring 11, and the threaded connection of the pressure ring 11 also facilitates disassembly.

[0030] The end face of the pressure ring 11 away from the explosion-proof sheet 10 is provided with a groove 12, which can be easily inserted into the groove 12 to drive the pressure ring 11 to rotate.

[0031] The explosion-proof disc 10 and the pressure ring 11 are equipped with a filter screen 17. The filter screen 17 can filter out larger impurities and prevent clogging of the explosion-proof disc 10.

[0032] The set screw 5 has a hexagonal groove 6 at its tail. The set screw 5 does not have a protrusion at the head, so that the set screw 5 does not protrude from the head 1, and the hexagonal groove 6 makes it easy to tighten the set screw 5.

[0033] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A gas detector, comprising a meter head (1), wherein the meter head (1) is threadedly connected to a sensor upper housing (7), the sensor upper housing (7) is threadedly connected to a sensor lower housing (2), a female seat (8) is fixedly disposed in the sensor upper housing (7), and a sensor (9) movably disposed in the sensor lower housing (2) is inserted into the female seat (8), characterized in that, The meter head (1) has a threaded hole (3) arranged radially along the upper housing (7) of the sensor, and a set screw (5) is threaded in the threaded hole (3) to abut against the upper housing (7) of the sensor.

2. A gas detector according to claim 1, characterized in that, The sensor housing (7) has an annular groove (13) aligned with the set screw (5).

3. A gas detector according to claim 1, characterized in that, The upper housing (7) of the sensor is fitted with a first sealing ring (4) that cooperates with the meter head (1) and a second sealing ring (14) that cooperates with the lower housing (2) of the sensor.

4. A gas detector according to claim 3, characterized in that, The set screw (5) is located between the first sealing ring (4) and the second sealing ring (14).

5. A gas detector according to claim 1, characterized in that, The lower housing (2) of the sensor is provided with an annular sealing gasket (16) that abuts against the sensor (9).

6. A gas detector according to claim 1, characterized in that, An explosion-proof sheet (10) is provided in the lower housing (2) of the sensor, and a pressure ring (11) for pressing the explosion-proof sheet (10) is threadedly connected in the lower housing (2) of the sensor.

7. A gas detector according to claim 6, characterized in that, The end face of the pressure ring (11) away from the explosion-proof sheet (10) is provided with a groove (12).

8. A gas detector according to claim 6, characterized in that, The explosion-proof sheet (10) and the pressure ring (11) are equipped with a filter screen (17).

9. A gas detector according to claim 1, characterized in that, The set screw (5) has a hexagonal groove (6) at its tail.

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