CN218995238U

CN218995238U - Photo-ionization gas detector with double-inlet and double-outlet gas channel

Info

Publication number: CN218995238U
Application number: CN202223273201.8U
Authority: CN
Inventors: 徐锋
Original assignee: Shenzhen Sanzhi Sensor Technology Co ltd
Current assignee: Shenzhen Sanzhi Sensor Technology Co ltd
Priority date: 2022-12-07
Filing date: 2022-12-07
Publication date: 2023-05-09
Anticipated expiration: 2032-12-07

Abstract

The utility model discloses a photoionization gas detector with double inlet and outlet channels, which comprises: a housing and a cover; a double-inlet and double-outlet channel arranged at the bottom of the shell; the device also comprises a first filtering device and a second purifying device which are respectively arranged on the air inlet pipe and the air outlet pipe; the device also comprises an access channel and an access channel which are arranged at the upper part of the shell; the device also comprises a circuit sensing unit arranged between the shell and the cover body. The utility model sucks the gas to be detected into the first filtering device by the built-in micro air pump, performs primary impurity filtration on the gas entering the device, and can detect the gas entering the gas chamber of the photoionization sensor by the action of the circuit sensing unit; the second purifying device can purify the gas to be detected and is used for cleaning the photo-ionization sensor air chamber, so that the detection accuracy of the circuit sensing unit is improved.

Description

Photo-ionization gas detector with double-inlet and double-outlet gas channel

Technical Field

The utility model relates to the technical field of gas detectors, in particular to a photoionization gas detector with double-inlet double-exhaust gas channel.

Background

The photoionization gas detector is a detector with extremely high sensitivity and wide application, and can detect volatile organic compounds and other toxic gases from extremely low concentration of 10ppb (parts per billion) to higher concentration of 10000ppm (1%). Compared with the traditional detection method, the method has the advantages of portability, high precision, quick response, capability of continuous test and the like.

In the production process of industries such as petroleum, chemical industry, pharmacy, metallurgy, paper making and the like, more or less some gases which are toxic and harmful to human bodies, in particular VOC (volatile organic compound) gases, are generated; the photo-ionization gas detector is used as equipment for detecting harmful gas in safe production, the accuracy of the photo-ionization gas detector is directly related to workshop production safety, but on one hand, the existing photo-ionization gas detector is easy to influence the service life of a gas chamber of a photo-ionization sensor due to impurities in the air, and the detection accuracy of the photo-ionization gas detector is also influenced; on the other hand, the detected gas is directly discharged without treatment, and the health of workshop personnel is easily endangered.

Disclosure of Invention

The utility model aims to provide a photoionization gas detector with double inlet and outlet channels, which can suck the gas to be detected into a first filtering device through a built-in micro air pump, perform primary impurity filtration on the gas entering the device, and detect the gas entering the gas chamber of a photoionization sensor through the action of a circuit sensing unit; the second purifying device can purify the gas to be detected and is used for cleaning the photo-ionization sensor air chamber, so that the detection accuracy of the circuit sensing unit is improved.

In order to achieve the above purpose, the present utility model provides the following technical solutions: a photo-ionization gas detector with dual inlet and outlet gas channels, comprising: a housing and a cover; the shell is connected with the cover body through a butt joint structure; the air inlet channel and the air outlet channel are arranged at the bottom of the shell and are communicated with the inside of the shell and are respectively used for air inlet and air outlet; the bottoms of the air inlet channel and the exhaust channel are respectively provided with an air inlet pipe and an exhaust pipe, and the air inlet channel and the exhaust channel further comprise a first purifying device and a second purifying device which are respectively arranged on the air inlet pipe and the exhaust pipe and are respectively used for filtering impurities and purifying gas; the access channel and the access channel are arranged at the upper part of the shell and are respectively used for accessing a cable and externally connecting an audible and visual alarm; the device also comprises a circuit sensing unit arranged between the shell and the cover body and used for detecting the concentration of the gas.

Preferably, the first purifying device and the second purifying device have the same structure; the first purifying device comprises a mounting sleeve fixed at the bottom of the air inlet channel, a rubber ring fixed in the mounting sleeve, and an internal thread arranged in the mounting sleeve; the external thread is arranged at the upper part of the air inlet pipe and is matched with the internal thread where the mounting sleeve is positioned; still including setting up inside detachable purification layer of intake pipe, and set up the inside step portion of intake pipe, when installation cover and intake pipe threaded connection, rubber circle and step portion centre gripping and fixed purification layer.

Preferably, the circuit sensing unit comprises a mounting plate fixed on the inner wall of the cover body and an electric air pump arranged on the mounting plate and used for sucking air; the gas concentration sensor is used for detecting the concentration of gas and comprises a mounting piece arranged on the mounting plate and a sensor inserted into the mounting piece; and the total control board is arranged on the inner wall of the cover body and used for controlling the operation of the sensing unit.

Preferably, the abutting structure comprises a step protruding portion and a step inserting portion which are respectively arranged on the opposite surfaces of the shell and the cover, and the step protruding portion is matched with the step inserting portion.

Preferably, the mounting plates on which the shell and the cover are positioned are also respectively fixed with a plug bush and a plug post, and the plug bush is matched with the plug post for further improving the stability of the shell after being in butt joint with the cover.

Preferably, the lower part of the shell is also provided with a plurality of mounting holes, so that the installation is convenient.

Compared with the prior art, the utility model has the following beneficial effects:

the detector of the utility model can suck the gas to be detected into the first filtering device by the built-in micro air pump, perform primary impurity filtration on the gas entering the device, and detect the gas entering the gas chamber of the photoionization sensor by the action of the circuit sensing unit; the second purifying device can purify the gas to be detected and is used for cleaning the photo-ionization sensor air chamber, so that the detection accuracy of the circuit sensing unit is improved.

Drawings

FIG. 1 is a schematic view of a first perspective view of the present utility model;

FIG. 2 is a schematic view of a second perspective view of FIG. 1;

FIG. 3 is a schematic view of the disassembled structure of FIG. 1;

FIG. 4 is a schematic view of the second perspective view of FIG. 3;

FIG. 5 is a schematic elevational view of the structure of FIG. 3;

fig. 6 is a schematic diagram showing a disassembled structure of the first purifying apparatus.

In the figure: 1. a housing; 2. a cover body; 3. accessing a channel; 4. a receiving channel; 5. a master control board; 6. a plug-in column; 7. a mounting plate; 8. an electric air pump; 9. a mounting member; 10. a sensor; 11. a plug bush; 12. an air intake passage; 13. an exhaust passage; 14. an air inlet pipe; 16. a mounting hole; 17. an external thread; 18. a mounting sleeve; 19. a rubber ring; 20. a purification layer; 21. a step boss; 22. a step insertion portion; 23. and an exhaust pipe.

Detailed Description

In the description of the present utility model, it should be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like indicate orientations or positional relationships based on the orientation or positional relationships shown in the drawings, merely to facilitate describing the present utility model and simplify the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and therefore should not be construed as limiting the present utility model. Embodiments of the present utility model will be described in detail below with reference to the accompanying drawings.

Referring to fig. 1 to 6, the present utility model preferably provides the following technical solutions: a gas detector with a purge function, comprising: a case 1 and a cover 2; the shell 1 is connected with the cover body 2 through a butt joint structure; and an air inlet channel 12 and an air outlet channel 13 which are arranged at the bottom of the shell 1, wherein the air inlet channel 12 and the air outlet channel 13 are communicated with the interior of the shell 1 and are respectively used for air inlet and air outlet; the bottoms of the air inlet channel 12 and the air outlet channel 13 are respectively provided with an air inlet pipe 14 and an air outlet pipe 23, and further comprise a first purifying device and a second purifying device which are respectively arranged on the air inlet pipe 14 and the air outlet pipe 23 and are respectively used for filtering impurities and purifying gas; the access channel 3 and the access channel 4 are arranged at the upper part of the shell 1 and are respectively used for accessing a cable and externally connecting an audible and visual alarm; and a circuit sensing unit arranged between the shell 1 and the cover body 2 and used for detecting the concentration of the gas.

The device can form a four-way structure through the arranged access channel 3, the access channel 4, the air inlet channel 12 and the exhaust channel 13, and particularly as shown in fig. 1 and 3, when the gas is required to be detected, the gas can enter the air inlet channel 12 through the air inlet pipe 14 where the first purifying device is positioned, the impurity dust in the gas can be filtered due to the effect of the first purifying device, and the gas can enter the inside of the shell 1 due to the fact that the air inlet channel 12 is communicated with the shell 1, at the moment, the concentration of the harmful gas in the gas can be detected by the circuit sensing unit arranged in the shell 1 and the cover body 2, if the concentration of the harmful gas exceeds the standard, the operation of an audible and visual alarm connected through the access channel 4 is controlled, an alarm is given out, and then the reminding is made, the gas can be filtered and purified through the second purifying device arranged at the lower part of the exhaust channel 13, so that the gas discharged by the exhaust pipe 23 is safe gas, and the detector can be inhaled into the inside of the shell 1 through the built-in micro air pump, the effect of the gas to be detected, the gas can enter the primary filtering device and the ion sensing unit for detecting the impurity ion sensing unit; the second purifying device can purify the gas to be detected and is used for cleaning the photo-ionization sensor air chamber, so that the detection accuracy of the circuit sensing unit is improved. The double-inlet double-exhaust gas channel can effectively solve the problem of gas channel pressure difference.

Further, the first purifying device and the second purifying device have the same structure; the first purifying device comprises a mounting sleeve 18 fixed at the bottom of the air inlet channel 12, a rubber ring 19 fixed inside the mounting sleeve 18, and internal threads arranged inside the mounting sleeve 18; the external thread 17 is arranged at the upper part of the air inlet pipe 14, and the external thread 17 is matched with the internal thread of the mounting sleeve 18; the purification device further comprises a detachable purification layer 20 arranged inside the air inlet pipe 14 and a step part arranged inside the air inlet pipe 14, wherein when the mounting sleeve 18 is in threaded connection with the air inlet pipe 14, the purification layer 20 is clamped and fixed by the rubber ring 19 and the step part.

As shown in fig. 3 and 6, since the internal thread formed in the mounting sleeve 18 can be matched with the external thread 17 formed on the upper part of the air inlet pipe 14, the rubber ring 19 is fixed in the air inlet channel 12, and the stepped part is formed in the air inlet pipe 14, the purification layer 20 clamped and fixed between the rubber ring 19 and the stepped part can be replaced through the spiral structure of the mounting sleeve 18 and the air inlet pipe 14, and the disassembly and assembly process is simple;

the first purifying device and the second purifying device have the same structure, the purifying layer 20 where the first purifying device is located can filter impurities in the gas, and the purifying layer 20 is preferably a filter screen; the second purifying device is disposed on the purifying layer 20 to purify the harmful gas, wherein the purifying layer 20 is preferably an activated carbon adsorption net, so that the gas discharged to the outside through the exhaust pipe 23 is a safety gas.

Further, the circuit sensing unit includes a mounting plate 7 fixed to the inner wall of the cover 2, and an electric air pump 8 provided on the mounting plate 7 for sucking air; the mounting piece 9 is arranged on the mounting plate 7, and further comprises a sensor 10 which is inserted into the mounting piece 9 and is used for detecting the concentration of gas; and a general control board 5 provided on the inner wall of the cover body 2 for controlling the operation of the sensing unit.

In this embodiment, the sensor 10 is preferably a PID gas sensor, and the PID gas sensor is collectively referred to as a PID photo-ion gas sensor, and the working principle flow thereof is as follows: PID uses an ultraviolet lamp (UV) light source to throw organic matters into positive and negative ions (ionization) which can be detected by a detector, firstly electrons generated by ionization and positively charged ions form weak current under the action of an electric field, and then the content of the matters is reflected by detecting the current intensity. Finally, the detector measures the charge of the ionized gas and converts the charge into a current signal, and the current is amplified and converted through a corresponding algorithm, so that the concentration value of the gas can be obtained; the PID gas sensor can be suitable for detecting most VOC volatile organic compounds and part of inorganic gases;

when the harmful gas in the gas needs to be detected, as shown in fig. 4, the gas is pumped into the shell 1 and the cover 2 through the air inlet channel 12 under the action of the electric air pump 8, is discharged through the air outlet channel 13, and the concentration of the harmful gas in the gas can be detected under the action of the sensor 10, if the concentration of the harmful gas exceeds the standard, the signal can be transmitted to the total control board 5, as shown in fig. 3, the total control board 5 receives and analyzes the harmful gas, so that the operation of an audible and visual alarm connected through the outlet channel 4 is controlled, the harmful gas detection process can be completed, and the sensor 10 can be quickly installed and detached through the installed part 9, so that the sensor 10 is convenient to replace.

Further, the abutting structure comprises a step protruding portion 21 and a step inserting portion 22 which are respectively arranged on the opposite faces of the shell 1 and the cover 2, and the step protruding portion 21 is matched with the step inserting portion 22.

As shown in fig. 3 and 4, since the step protruding portion 21 is adapted to the step inserting portion 22, when the housing 1 and the cover 2 need to be assembled or disassembled, the step protruding portion 21 where the housing 1 is located is abutted to or separated from the step inserting portion 22 where the cover 2 is located, so that a quick assembling and disassembling process can be achieved.

Further, the housing 1 is further fixed with a plug bush 11 and a plug post 6 on the cover 2, and the plug bush 11 is adapted to the plug post 6, so as to further improve the stability of the housing 1 after being docked with the cover 2.

As shown in fig. 3 and 4, since the plug bush 11 is adapted to the plug post 6, when the housing 1 is docked with the cover 2, the plug post 6 can be plugged into the plug bush 11 at this time, so that the stability of the housing 1 after being docked with the cover 2 is improved.

Further, a plurality of mounting holes 16 are formed in the lower portion of the shell 1, so that the installation is facilitated.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communicated with the inside of two elements or the interaction relationship of the two elements. The detachable mounting mode is various, for example, the detachable mounting mode can be matched with the buckle through plugging, for example, the detachable mounting mode can be realized through a bolt connection mode, and the like.

The conception, specific structure, and technical effects produced by the present utility model are clearly and completely described above in connection with the embodiments and the drawings so as to fully understand the objects, features, and effects of the present utility model. It is apparent that the described embodiments are only some embodiments of the present utility model, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present utility model based on the embodiments of the present utility model. In addition, all coupling/connection relationships mentioned herein do not refer to direct connection of the components, but rather, refer to the fact that a more optimal coupling structure may be formed by adding or subtracting coupling aids depending on the particular implementation.

The foregoing embodiments are provided for further explanation of the present utility model and are not to be construed as limiting the scope of the present utility model, and some insubstantial modifications and variations of the present utility model, which are within the scope of the utility model, will be suggested to those skilled in the art in light of the foregoing teachings.

Claims

1. The photoionization gas detector with double inlet and outlet channels is characterized by comprising:

a housing (1) and a cover (2);

the shell (1) is connected with the cover body (2) through a butt joint structure;

the air inlet channel (12) and the air outlet channel (13) are formed in the bottom of the shell (1), and the air inlet channel (12) and the air outlet channel (13) are communicated with the interior of the shell (1) and are respectively used for air inlet and air outlet;

the bottoms of the air inlet channel (12) and the air outlet channel (13) are respectively provided with an air inlet pipe (14) and an air outlet pipe (23), and the air purifier further comprises a first purifying device and a second purifying device which are respectively arranged on the air inlet pipe (14) and the air outlet pipe (23) and are respectively used for filtering impurities and purifying gas;

the access channel (3) and the access channel (4) are arranged at the upper part of the shell (1) and are respectively used for accessing a cable and externally connecting an audible and visual alarm;

the device also comprises a circuit sensing unit arranged between the shell (1) and the cover body (2) and used for detecting the concentration of the gas.

2. The dual inlet and outlet channel photoionization gas detector of claim 1, wherein: the first purifying device and the second purifying device have the same structure;

the first purifying device comprises a mounting sleeve (18) fixed at the bottom of the air inlet channel (12), a rubber ring (19) fixed inside the mounting sleeve (18) and internal threads formed inside the mounting sleeve (18);

the external thread (17) is arranged at the upper part of the air inlet pipe (14), and the external thread (17) is matched with the internal thread where the mounting sleeve (18) is arranged;

the purification device is characterized by further comprising a detachable purification layer (20) arranged inside the air inlet pipe (14) and a step part arranged inside the air inlet pipe (14), wherein when the installation sleeve (18) is in threaded connection with the air inlet pipe (14), the purification layer (20) is clamped and fixed between the rubber ring (19) and the step part.

3. The dual inlet and outlet channel photoionization gas detector of claim 1, wherein: the circuit sensing unit comprises a mounting plate (7) fixed on the inner wall of the cover body (2), and an electric air pump (8) arranged on the mounting plate (7) and used for sucking air;

the mounting piece (9) is arranged on the mounting plate (7), and the sensor (10) is inserted into the mounting piece (9) and is used for detecting the concentration of gas;

and a total control board (5) arranged on the inner wall of the cover body (2) and used for controlling the operation of the sensing unit.

4. The dual inlet and outlet channel photoionization gas detector of claim 1, wherein: the butt joint structure comprises a step bulge part (21) and a step insertion part (22) which are respectively arranged on the opposite surfaces of the shell (1) and the cover body (2), and the step bulge part (21) is matched with the step insertion part (22).

5. The dual inlet and outlet channel photoionization gas detector of claim 1, wherein: the shell (1) and the mounting plate (7) where the cover body (2) are located are also respectively fixed with a plug bush (11) and a plug post (6), and the plug bush (11) is matched with the plug post (6) for further improving the stability of the shell (1) after being in butt joint with the cover body (2).

6. The dual inlet and outlet channel photoionization gas detector of claim 1, wherein: the lower part of the shell (1) is also provided with a plurality of mounting holes (16) which are convenient for mounting.