CN215004974U - Explosion-proof gas sensor easy to install - Google Patents

Abstract

An explosion-proof gas sensor easy to install comprises an explosion-proof shell, an explosion-proof sheet, a detector group, an infrared light source group, an optical cavity, a signal processing group, an explosion-proof rear end cover and a cable; the upper part of the explosion-proof shell is provided with a first threaded pipe, the lower part of the explosion-proof shell is provided with a first hollow pipe communicated with the first threaded pipe, and the outer wall of the bottom of the first hollow pipe is provided with a connecting external thread; the upper part of the explosion-proof rear end cover is a second hollow pipe, the inner wall of the second hollow pipe is provided with a connecting internal thread matched with the connecting external thread, and the lower part of the explosion-proof rear end cover is a second threaded pipe; the explosion-proof shell and the explosion-proof rear end cover are in threaded connection to form a cavity, an explosion-proof sheet, an optical cavity, a signal processing group and a cable are sequentially installed in the cavity from top to bottom, the other end of the cable penetrates through a second threaded pipe, and an infrared light source group and a detector group are installed on the optical cavity. The application provides an explosion-proof gas sensor of easy installation, the equipment of being convenient for, maintenance, and the performance is more stable.

Description

Explosion-proof gas sensor easy to install

Technical Field

The utility model relates to a gas sensor, concretely relates to explosion-proof type gas sensor of easy installation.

Background

Ethylene oxide gas is an organic compound, a colorless gas, and is widely used in the washing, pharmaceutical, printing and dyeing, and medical industries. However, ethylene oxide gas is a toxic and harmful carcinogen, and is flammable and explosive. Since ethylene oxide gas is harmful to human bodies and the environment, the ethylene oxide gas is suitable for closed operation, and gas detection equipment with an ethylene oxide sensor is required to be installed in the ethylene oxide environment to detect the concentration of the gas in real time, so that the gas is prevented from leaking into the air of a workplace. Because ethylene oxide gas is flammable and explosive, the used ethylene oxide sensor and detection equipment meet the explosion-proof requirement. At present, most of ethylene oxide gas in the testing environment in the domestic market adopts an electrochemical sensor or an infrared sensor imported from abroad.

When the electrochemical sensor is used for testing ethylene oxide gas, the built-in electrolyte can react with the ethylene oxide gas, so that the electrochemical sensor is worn when in use, short in service life and troublesome in maintenance. The imported infrared ethylene oxide sensor used in China at present is expensive.

Grant publication number CN201628682U, name: the patent of the Chinese utility model of the miniature explosion-proof multi-gas infrared sensor comprises an infrared gas detector, an infrared light source, an explosion-proof shell, an explosion-proof metallurgical powder net, an optical cavity, two circuit boards with signal acquisition circuits, an explosion-proof shell cover and an output pin; an optical channel is arranged in the optical cavity, an air vent, an infrared gas detector mounting hole and an infrared light source mounting hole are arranged on the optical cavity, the detection end of the infrared gas detector is arranged at one end in the optical channel, and the light emitting end of the infrared light source is arranged at the other end in the optical channel; epoxy resin is poured between the explosion-proof shell cover and the circuit board; the output pin, the infrared gas detector and the infrared light source pin are respectively connected with a signal acquisition circuit; the infrared gas detector is a four-channel thermopile detector. The infrared sensor can analyze multiple gas components and has the advantages of small size, high precision, convenient use and wide application range. This patent has solved the problem that exists among the above-mentioned prior art to a certain extent, but this gas sensor has following defect:

1. the gas sensor cannot be conveniently and quickly installed in a test environment;

2. the parts of the gas sensor are all installed in the space between the explosion-proof shell and the explosion-proof shell cover, and the explosion-proof shell and the fixed connection structure of the explosion-proof shell cover and the poured epoxy resin bring inconvenience to earlier stage assembly and later stage maintenance.

SUMMERY OF THE UTILITY MODEL

In order to solve the problems existing in the prior art, the application provides an explosion-proof gas sensor easy to install, and the explosion-proof gas sensor is easy to install, convenient to assemble and maintain and more stable in performance.

In order to realize the technical effect, the utility model discloses a concrete technical scheme as follows:

an explosion-proof gas sensor easy to install comprises an explosion-proof shell, an explosion-proof sheet, a detector group, an infrared light source group, an optical cavity, a signal processing group, an explosion-proof rear end cover and a cable; the upper part of the explosion-proof shell is provided with a first threaded pipe, the lower part of the explosion-proof shell is provided with a first hollow pipe communicated with the first threaded pipe, and the outer wall of the bottom of the first hollow pipe is provided with a connecting external thread; the upper part of the explosion-proof rear end cover is a second hollow pipe, the inner wall of the second hollow pipe is provided with a connecting internal thread matched with the connecting external thread, and the lower part of the explosion-proof rear end cover is a second threaded pipe; explosion-proof casing and explosion-proof rear end cap spiro union formation cavity, from top to bottom installs explosion-proof piece, optical cavity, signal processing group, cable in proper order in this cavity, and the other end of this cable passes the second screwed pipe and extends to the outside, installs infrared light source group, detector group on this optical cavity. The detector group, the infrared light source group, the optical cavity, the signal processing group, the installation schemes of the infrared light source group and the detector group on the optical cavity, and the connection relations of the infrared light source group, the detector group and the signal processing group all adopt the prior art, and are not described in detail herein.

The explosion-proof shell is connected with the explosion-proof rear end cover in a screwed mode, and the optical cavity, the infrared light source group and the detector group are wrapped in the insulating space ring. After the optical cavity, the infrared light source group and the detector group are installed, the insulating space ring is adopted to insulate and isolate the parts in the gas sensor from the explosion-proof shell, and the influences such as short circuit and the like on related module circuits in the signal processing group are prevented, so that the performance of the gas sensor is more stable.

Further, still include a waterproof ventilated membrane, this waterproof ventilated membrane set up in between explosion-proof piece and the optical cavity. Through setting up waterproof ventilated membrane, isolated steam get into this gas sensor internal portion and influence, damage its inside components and parts, this has also improved this gas sensor's stability on the other hand.

The calibration cap comprises a cylindrical body with one end closed and the other end open, wherein the open end of the cylindrical body is provided with a thread matched with the first threaded pipe, and the outer wall of the calibration cap is provided with two vent holes. The threads (generally adopting 3/4-inch NPT external threads) arranged on the first threaded pipe in the explosion-proof shell can also be used as calibration threads to be matched with the calibration cap, the main body of the calibration cap is a cylindrical body with one closed end and the other open end, the open end of the main body is provided with threads matched with the calibration threads, and the outer wall of the calibration cap is also provided with two vent holes for the gas inlet and outlet for venting the gas sensor during calibration. Therefore, the calibration convenience of the gas sensor is improved, the calibration in batch production is facilitated, and the efficiency is improved.

Further, 3/4-inch NPT external threads are arranged on the first threaded pipe and the second threaded pipe.

Furthermore, parallel wrench grooves are arranged on the outer wall of the explosion-proof rear end cover. The spanner groove is convenient for dismantle explosion-proof rear end cap.

Further, the detector group is a detector group capable of detecting ethylene oxide gas.

Furthermore, a sealing fixing piece for installing a cable is further arranged in the second threaded pipe, the sealing fixing piece comprises a main body, a first sealing ring, a first nut, a second sealing ring and a second nut, matched external threads and internal threads are respectively arranged on the outer wall of the main body and the inner wall of the second threaded pipe, the lower part of the main body is screwed in the second threaded pipe, the first sealing ring is tightly attached to the end face of the second threaded pipe through the first nut, and sealing is formed between the sealing fixing piece and the explosion-proof rear end cover through the first sealing ring; the lower part of the second sealing ring is embedded into the main body, the upper part of the second sealing ring is screwed on the main body through the second nut and is drawn in inwards, and the cable outlet is sealed when the second sealing ring is drawn in, so that the fixing and sealing effects can be achieved, and compared with the conventional method of fixing and sealing by adopting epoxy resin glue, the method is easier to maintain in the later period.

Furthermore, the explosion-proof sheet adopts a metal net made of 50-100 meshes of metal wires.

According to the technical scheme, the explosion-proof shell and the explosion-proof rear end cover are designed into the detachable connection mode of mutual screw connection, so that convenience is brought to early assembly and later maintenance; in addition, set up first screwed pipe, second screwed pipe respectively at explosion-proof casing, explosion-proof rear end cap for this gas sensor can be convenient, install test environment fast, and the installation and the use of this gas sensor of being convenient for can be used to install this gas sensor on the detection pipeline. Ideally, the gas sensor can be installed on a recirculation line for gas exhaust, making the gas sensor of the present application more versatile.

Drawings

The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments.

FIG. 1 is an overall view of the present invention;

fig. 2 is a schematic cross-sectional view of the present invention;

FIG. 3 is an exploded view of the present invention;

fig. 4 is a schematic structural diagram of a calibration cap in the present invention;

fig. 5 is a schematic view of a sealing fixture according to the present invention;

FIG. 6 is an exploded view of FIG. 5;

fig. 7 is a schematic view illustrating the installation of the sealing fixing member on the explosion-proof rear end cover according to the present invention;

wherein, 1, an explosion-proof shell; 1a, a first threaded pipe; 1b, a first hollow pipe; 2. explosion-proof sheets; 3. a detector group; 4. an infrared light source group; 5. an optical cavity; 6. a signal processing group; 7. an explosion-proof rear end cover; 7a, a second hollow pipe; 7b, a second threaded pipe; 8. a cable; 9. connecting external threads; 10. a cavity; 11. a wrench groove; 12. calibrating the cap; 121. a columnar body; 122. a vent hole; 13. an insulating space ring; 14. a waterproof breathable film; 15. sealing the fixing member; 151. a main body; 152. a first seal ring; 153. a first nut; 154. a second seal ring; 155. a second nut.

Detailed Description

In order to make the objects, technical solutions and advantages of the present embodiments more clear, the technical solutions in the present embodiments will be described clearly and completely below with reference to the accompanying drawings in the present embodiments, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by a person of ordinary skill in the art without any creative effort belong to the protection scope of the present application.

In the description of the present invention, it should be understood that the terms "upper portion", "lower portion", "tail end", "left and right", "up and down", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for convenience of describing the present application and simplifying the description, but do not indicate or imply that the equipment or elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.

In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral connections; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Examples

Referring to fig. 1 to 3, an explosion-proof gas sensor easy to mount includes an explosion-proof housing 1, an explosion-proof sheet 2, a detector group 3, an infrared light source group 4, an optical cavity 5, a signal processing group 6, an explosion-proof rear end cover 7, and a cable 8; the upper part of the explosion-proof shell 1 is a first threaded pipe 1a, the lower part thereof is a first hollow pipe 1b communicated with the first threaded pipe, and the outer wall of the bottom of the first hollow pipe 1b is provided with a connecting external thread 9; the upper part of the explosion-proof rear end cover 7 is a second hollow pipe 7a, the inner wall of the second hollow pipe is provided with a connecting internal thread (not shown) matched with the connecting external thread 9, and the lower part of the explosion-proof rear end cover 7 is a second threaded pipe 7 b; explosion-proof casing 1 and explosion-proof rear end cap 7 spiro union form a cavity 10, from top to bottom installs explosion-proof piece 2, optical cavity 5, signal processing group 6, cable 8 in proper order in this cavity 10, and the other end of this cable passes second screwed pipe 7b and extends to the outside, installs infrared light source group 4, detector group 3 on this optical cavity 5. The detector group, the infrared light source group, the optical cavity, the signal processing group, the installation schemes of the infrared light source group and the detector group on the optical cavity, and the connection relations of the infrared light source group, the detector group and the signal processing group all adopt the prior art, and are not described in detail herein. One end of the explosion-proof housing 1 is provided with a first threaded pipe with 3/4-inch NPT external threads for mounting the gas sensor on a detection pipeline or equipment. One end of the explosion proof rear end cap 7 is provided with a second threaded tube also employing an 3/4 inch NPT external thread for mounting the present gas sensor on a corresponding transmitter or monitoring device. The outer wall of the explosion-proof rear end cover 7 is provided with parallel wrench grooves 11 for conveniently disassembling the explosion-proof rear end cover 7.

Referring to fig. 4, the 3/4-inch NPT external thread provided on the first threaded pipe 1a in the explosion-proof housing 1 can also be used as a calibration thread to cooperate with the calibration cap 12, the main body of the calibration cap is a cylindrical body 121 with one closed end and the other open end, the inner wall of the open end of the calibration cap is provided with an internal thread matching with the calibration thread (i.e. the thread on the first threaded pipe), and the outer wall of the calibration cap is further provided with two vent holes 122 for the gas inlet and outlet for the calibration timing ventilation of the gas sensor. Therefore, the calibration convenience of the gas sensor is improved, the calibration in batch production is facilitated, and the efficiency is improved.

The optical cavity 5 is used for reflecting the infrared light emitted by the infrared light source group 4 for multiple times, increasing the optical path of the infrared light, increasing the absorption amount of the gas to the infrared light, so that the absorption variation amount of the infrared light is increased under the condition that the gas concentration is not changed, and further increasing the resolution ratio of gas concentration measurement. The surface of the optical cavity is plated with a material with good light reflectivity, such as copper plating, gold plating and the like.

And the infrared light source group 4 is arranged on the optical cavity 5 and is used for emitting infrared light. The optical cavity is provided with a groove for installing the infrared light source group, the infrared light source group can be fixed on the optical cavity by using specific glue, and the signal processing group performs electrical modulation on the infrared light source group, so that the infrared light source group emits light and flickers according to a certain frequency. The structure of the gas molecule itself determines which wavelengths of infrared light it will absorb. By using this property, a change in concentration of a certain gas is indirectly measured by measuring a change in infrared light of a specific wavelength.

And the detector group 3 is arranged on the optical cavity and used for receiving the infrared light absorbed by the gas. The optical cavity is also provided with a groove for installing the detector group, and the detector group can be fixed on the optical cavity by using specific glue. Flammable and explosive gases include: the absorption peaks of different gases such as ethylene oxide, methane, CO and the like are different, the types of the detected gases are changed by selecting the detector groups for detecting different wavelengths, and different gases can be measured by changing the parameters of the detector groups and the signal processing group. The detector group in this application uses infrared heat release electric detector, can detect to ethylene oxide gas.

And the signal processing group 6 is used for processing the signals of the detector group 3 and outputting gas concentration information and comprises a signal amplification module, an AD acquisition module, a main control module and an output module. The signal amplification module is used for amplifying signals output by the detector group, because the signals output by the detector group are in millivolt level, the signals are amplified to volt level by using the signal amplification module (generally adopting a signal amplification circuit), the signals are convenient to collect and process, the AD acquisition module is used for collecting analog signals output by the signal amplification module, and the analog signals are converted into digital signals by the AD acquisition module and then are sent to the main control module. The main control module is loaded with a data processing program for processing the sensor data and converting the sensor data into a gas concentration value. The output module is used for outputting the data processed by the main control module, and the output mode can be selected according to the requirement: UART, RS485, analog voltage/current and the like. The infrared light is introduced into the optical cavity filled with the gas to be detected after electrical modulation, the infrared light irradiates the detector group after gas absorption, so that the detector group generates an electric signal, the signal amplification module amplifies the signal output by the detector group and then transmits the signal to the AD acquisition module, and the AD acquisition module converts the acquired analog signal quantity into a digital signal quantity and then transmits the digital signal quantity to the main control module. And the main control module calculates to obtain the concentration of the corresponding detection gas according to the corresponding measurement signal and the reference signal.

After the optical cavity 5, the infrared light source group 4 and the detector group 3 are installed, the insulating spacer 13 is adopted to insulate and isolate the parts in the gas sensor from the explosion-proof shell 1, so that the influences such as short circuit and the like on related module circuits in the signal processing group 6 are prevented.

And the waterproof breathable film 14 is arranged between the explosion-proof sheet 2 and the optical cavity 5. Through setting up waterproof ventilated membrane, isolated steam get into this gas sensor internal portion and influence, damage its inside components and parts, this has also improved this gas sensor's stability on the other hand.

The technical scheme for realizing explosion prevention in the application comprises the following steps: 1. the explosion-proof sheet with explosion-proof function is made of 50-100 mesh metal wires. 2. The wall thickness requirement of the explosion-proof shell is as follows: greater than or equal to 3mm, the wall thickness in this patent reaches explosion-proof requirement. 3. The thread turns of the explosion-proof shell and the explosion-proof rear end cover are designed to meet the preset explosion-proof requirement. 4. After the gas sensor is assembled, referring to fig. 5, a seal holder 15 for attaching a cable is installed in the second threaded pipe 7 b.

Referring to fig. 6 and 7, the sealing and fixing member 15 includes a main body 151, a first sealing ring 152, a first nut 153, a second sealing ring 154 and a second nut 155, where the outer wall of the main body and the inner wall of the second threaded pipe are respectively provided with external threads and internal threads matched with each other, the lower portion of the main body is screwed into the second threaded pipe 7b, the first sealing ring 152 is tightly attached to the end face of the second threaded pipe through the first nut 153, and a seal is formed between the sealing and fixing member and the explosion-proof rear end cap through the first sealing ring; the lower part of the second sealing ring 154 is embedded in the main body 151, and the upper part is screwed on the main body by a second nut 155 and folded inwards, so that the cable outlet is sealed when the second sealing ring is folded.

It is right to have used specific individual example above the utility model discloses expound, only be used for helping to understand the utility model discloses, not be used for the restriction the utility model discloses. To the technical field of the utility model technical personnel, the foundation the utility model discloses an idea can also be made a plurality of simple deductions, warp or replacement.

Claims (9)

1. An explosion-proof gas sensor easy to install is characterized by comprising an explosion-proof shell, an explosion-proof sheet, a detector group, an infrared light source group, an optical cavity, a signal processing group, an explosion-proof rear end cover and a cable; the upper part of the explosion-proof shell is provided with a first threaded pipe, the lower part of the explosion-proof shell is provided with a first hollow pipe communicated with the first threaded pipe, and the outer wall of the bottom of the first hollow pipe is provided with a connecting external thread; the upper part of the explosion-proof rear end cover is a second hollow pipe, the inner wall of the second hollow pipe is provided with a connecting internal thread matched with the connecting external thread, and the lower part of the explosion-proof rear end cover is a second threaded pipe; explosion-proof casing and explosion-proof rear end cap spiro union formation cavity, from top to bottom installs explosion-proof piece, optical cavity, signal processing group, cable in proper order in this cavity, and the other end of this cable passes the second screwed pipe and extends to the outside, installs infrared light source group, detector group on this optical cavity.

2. An explosion-proof gas sensor easy to install as claimed in claim 1, further comprising an insulating space ring, wherein the insulating space ring is installed in a cavity formed by the explosion-proof shell and the explosion-proof rear end cover in a threaded manner, and the optical cavity, the infrared light source group and the detector group are wrapped in the insulating space ring.

3. An explosion-proof gas sensor easy to install as claimed in claim 1, further comprising a waterproof breathable membrane disposed between the explosion-proof sheet and the optical cavity.

4. An easily installable explosion-proof gas sensor as recited in claim 1, further comprising a calibration cap comprising a column with one end closed and the other end open, wherein the column is provided with a screw thread at the open end thereof for mating with the first threaded tube, and wherein two vent holes are provided on an outer wall of the calibration cap.

5. An easily installable explosion proof gas sensor as recited in claim 1 wherein the first and second tubes are provided with 3/4 inch NPT external threads.

6. An easily installable explosion proof gas sensor as recited in claim 1 wherein the explosion proof rear end cap further comprises parallel wrench grooves on the outer wall.

7. An easily installable explosion-proof gas sensor as recited in claim 1, wherein the detector group is a detector group capable of detecting ethylene oxide gas.

8. An easily-installed explosion-proof gas sensor according to claim 1, wherein a sealing fixing member for installing a cable is further provided in the second threaded pipe, the sealing fixing member comprises a main body, a first sealing ring, a first nut, a second sealing ring and a second nut, the outer wall of the main body and the inner wall of the second threaded pipe are respectively provided with matched external threads and internal threads, the lower part of the main body is screwed in the second threaded pipe, and the first sealing ring is tightly attached to the end face of the second threaded pipe through the first nut; the lower part of the second sealing ring is embedded into the main body, and the upper part of the second sealing ring is screwed on the main body through a second nut and is folded inwards.

9. An easily installable explosion-proof gas sensor as claimed in claim 1, wherein the explosion-proof sheet is a metal mesh made of 50-100 mesh metal wires.

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