阅读说明：本技术 一种泵吸式便携气体检测仪的限压型气室结构 (Pressure-limiting air chamber structure of pump-suction type portable gas detector ) 是由 王松 李佳 于 2021-10-25 设计创作，主要内容包括：本发明公开了一种泵吸式便携气体检测仪的限压型气室结构,包括一面壳,所述面壳内侧排布有若干气室,还包括一与供气装置连接的阻尼腔,所述阻尼腔的进气口与供气装置连接,所述阻尼腔的排气口分别与若干所述气室连通,且所述阻尼腔的排气口与所述气室之间位于不同平面,任一所述气室还对应安装一用于进行气体检测的传感器,所述传感器安装于PCB板上,所述气室还设有用于将气体排出的限压孔。本发明技术方案改善现有气体检测仪的气室结构,使气室压力保持在传感器额定工作压力范围内,并减少隔膜泵输出气体压力的脉动影响,以保证气体检测仪的计量性能。(The invention discloses a pressure-limiting air chamber structure of a pump-suction type portable gas detector, which comprises a face shell, a damping cavity and a sensor, wherein a plurality of air chambers are arranged on the inner side of the face shell, the damping cavity is connected with a gas supply device, an air inlet of the damping cavity is connected with the gas supply device, an air outlet of the damping cavity is respectively communicated with the air chambers, the air outlet of the damping cavity and the air chambers are positioned on different planes, the sensor for gas detection is correspondingly arranged on any air chamber, the sensor is arranged on a PCB, and the air chambers are also provided with pressure-limiting holes for discharging gas. The technical scheme of the invention improves the gas chamber structure of the existing gas detector, so that the pressure of the gas chamber is kept within the rated working pressure range of the sensor, and the pulsation influence of the output gas pressure of the diaphragm pump is reduced, thereby ensuring the metering performance of the gas detector.)

1. The utility model provides a pressure limiting type air chamber structure of portable gas detection appearance of pump suction formula which characterized in that, includes a face-piece, a plurality of air chambers have arranged to the face-piece inboard, still include a damping chamber of being connected with air feeder, the air inlet and the air feeder of damping chamber are connected, the gas vent in damping chamber respectively with a plurality of the air chamber intercommunication, just the gas vent in damping chamber with lie in the coplanar between the air chamber, arbitrary the air chamber still corresponds the installation one and is used for carrying out the sensor that gaseous detected, the sensor is installed on the PCB board, the air chamber still is equipped with and is used for the pressure limiting hole with gas outgoing.

2. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 1, wherein the number of the air chambers is four, and the four air chambers are arranged around the damping cavity.

3. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 2, wherein the air chambers are arranged on the inner surface of the face shell, the damping cavity is located in the inner layer of the face shell, and the air inlet of the damping cavity extends from the inner layer of the face shell to the outside of the face shell.

4. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 1, wherein the air supply means comprises a diaphragm pump for sucking external air into the air chamber, the diaphragm pump is connected with an air inlet pipe and an air outlet pipe, the air inlet pipe is used for communicating with the external air, and the air outlet pipe is connected with the air inlet of the damping chamber.

5. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 4, wherein a water trap filter is further installed at the port of the air inlet pipe.

6. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 1, wherein a sealing rubber gasket is respectively disposed between the sensor and the air chamber.

7. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 1, wherein an air chamber cover is further installed on an outer side surface of the face shell, and the air chamber cover is provided with a plurality of groups of vent holes respectively corresponding to the pressure-limiting holes.

8. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 7, wherein a waterproof filter membrane is further respectively added between the plurality of groups of the vent holes and the pressure-limiting holes.

9. The pressure-limiting air chamber structure of the pump-suction type portable gas detector as claimed in claim 7, wherein the air chamber cover is fastened to the outer side surface of the face shell by screws.

Technical Field

The invention relates to the technical field of gas detectors, in particular to a pressure-limiting type gas chamber structure of a pump-suction type portable gas detector.

Background

In order to isolate flammable and explosive gases from the surrounding environment and prevent toxic and harmful gases from leaking, a pump-type gas detector usually adopts a gas diaphragm pump, and the working principle of the diaphragm pump determines that the pressure of output gas has pulsatility. Some precision gas sensors, such as electrochemical sensors, are extremely sensitive to pressure changes, and the pulsating pressure can make the output signal of the sensor unstable, which affects the accuracy of measurement.

Meanwhile, the sensor of the portable gas detector generally works near the standard atmospheric pressure, the gas pressure output from the diaphragm pump is often higher, if the sensor is directly contacted with the sensor, the output current of the sensor is increased, the service life of the sensor is shortened, the influence of the output pressure pulsation of the diaphragm pump is amplified, and the stability of measurement is difficult to guarantee.

Accordingly, the prior art is deficient and needs improvement.

Disclosure of Invention

The invention mainly aims to provide a pressure-limiting air chamber structure of a pump-suction type portable gas detector, aiming at improving the air chamber structure of the existing gas detector, keeping the pressure of an air chamber within the rated working pressure range of a sensor, reducing the pulsation influence of the pressure of the output gas of a diaphragm pump and ensuring the metering performance of the gas detector.

In order to achieve the purpose, the pressure limiting type air chamber structure of the pump suction type portable gas detector comprises a face shell, a plurality of air chambers are arranged on the inner side of the face shell, the pressure limiting type air chamber structure further comprises a damping cavity connected with a gas supply device, an air inlet of the damping cavity is connected with the gas supply device, an air outlet of the damping cavity is respectively communicated with the air chambers, the air outlet of the damping cavity and the air chambers are located on different planes, a sensor for gas detection is correspondingly installed on any air chamber, the sensor is installed on a PCB, and the air chambers are further provided with pressure limiting holes for discharging gas.

Preferably, the number of the air chambers is four, and the four air chambers are arranged around the damping cavity.

Preferably, the air chambers are arranged on the inner side surface of the face shell, the damping cavity is located in the inner layer of the face shell, and the air inlet of the damping cavity extends from the inner layer of the face shell to the outside of the face shell.

Preferably, the air supply device comprises a diaphragm pump for sucking external air into the air chamber, the diaphragm pump is connected with an air inlet pipe and an air outlet pipe, the air inlet pipe is used for being communicated with the external air, and the air outlet pipe is connected with an air inlet of the damping cavity.

Preferably, the air inlet pipe port is also provided with a water trap filter.

Preferably, a sealing rubber gasket is respectively arranged between the sensor and the air chamber.

Preferably, the outer side surface of the face shell is further provided with an air chamber cover, and the air chamber cover is provided with a plurality of groups of vent holes corresponding to the pressure limiting holes respectively.

Preferably, a waterproof filtering membrane is additionally arranged between the plurality of groups of vent holes and the pressure limiting holes respectively.

Preferably, the air chamber cover is fastened to the outer side surface of the face shell by screws.

Compared with the prior art, the invention has the beneficial effects that: the air chamber structure of the existing gas detector is improved, the damping cavity is additionally arranged between the diaphragm pump and the air chamber, so that gas sucked by the diaphragm pump is buffered and depressurized through the damping cavity and then flows into the air chamber to detect the sensor, the pressure of the air chamber is kept within the rated working pressure range of the sensor, the pulsation influence of the output gas pressure of the diaphragm pump is reduced, the metering performance of the gas detector is ensured, and the detection precision is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is an exploded view of a gas cell structure according to the present invention;

FIG. 2 is a gas path operation diagram of the gas chamber of the present invention;

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The pressure limiting type air chamber structure of portable gas detection appearance of pump-suction formula that this embodiment provided, refer to fig. 1 and fig. 2, including a face shell 1, a plurality of air chambers 2 have been arranged to face shell 1 inboard, still include a damping chamber 3 of being connected with air feeder, the air inlet 31 and the air feeder of damping chamber 3 are connected, the gas vent of damping chamber 3 respectively with a plurality of air chamber 2 intercommunication, just the gas vent of damping chamber 3 with lie in different planes between the air chamber 2, arbitrary air chamber 2 still corresponds an installation and is used for carrying out the sensor 4 of gaseous detection, sensor 4 installs on PCB board 5, air chamber 2 still is equipped with and is used for gas outgoing pressure limiting hole 6.

Further, air feeder includes a diaphragm pump 7 that is used for inhaling air chamber 2 with outside air, diaphragm pump 7 is connected with intake pipe 8 and outlet duct 9, intake pipe 8 be used for with outside air intercommunication, outlet duct 9 with the air inlet 31 of die cavity 3 is connected, water trap filter 10 is still installed to 8 ports in the intake pipe, can prevent dust-proof filtration to inspiratory outside gas, prevents that impurity in the gas from getting into air chamber 2 in, influences its normal use.

It should be noted that, in this embodiment, the structure of the gas chamber 2 of the existing gas detector is improved, the damping cavity 3 is added between the diaphragm pump 7 and the gas chamber 2, so that the gas sucked by the diaphragm pump 7 is buffered and depressurized by the damping cavity 3 and then flows into the gas chamber 2 for detection by the sensor 4, and meanwhile, the existing gas in the damping cavity 3 generates resistance to the gas subsequently input by the diaphragm pump 7, thereby playing a role in suppressing pressure pulsation; the inlet of the air chamber 2 is far away from the gas inlet of the damping cavity 3, so that the pulsation of the output pressure of the diaphragm pump 7 is minimized, the pressure of the air chamber 2 is kept in the rated working pressure range of the sensor 4, the pulsation influence of the output gas pressure of the diaphragm pump 7 is reduced, the metering performance of the gas detector is ensured, and the detection precision is improved.

Further, the number of the air chambers 2 is four, and the four air chambers 2 are arranged around the damping cavity 3. The air chambers 2 are arranged on the inner side surface of the face shell 1, the damping cavity 3 is positioned on the inner layer of the face shell 1, and the air inlet 31 of the damping cavity 3 extends to the outside of the face shell 1 from the inner layer of the face shell 1. Referring to fig. 2, the arrow direction is the gas flow direction, the outside gas that diaphragm pump 7 inhales, at first get into damping chamber 3 in, because damping chamber 3 is more close to the lateral surface of face-piece 1, and air chamber 2 is located the medial surface of face-piece 1, therefore, gaseous inside surface along face-piece 1 gets into behind the lateral surface direction damping chamber 3, can receive the buffering step-down of damping chamber 3, thereby change gaseous flow direction, make its opposite direction (from face-piece 1 outside surface to face-piece 1 medial surface direction) flow to air chamber 2 in, can carry out fine step-down and buffering to gas, thereby guarantee that the gaseous pressure range of sensor 4 is satisfied to the gas after the step-down, make gas and sensor 4 fully contact, improve the detection precision to gas. The detected gas is discharged through the pressure limiting hole 6 of the gas chamber 2.

Further, sensor 4 with be equipped with a sealing rubber packing ring 11 between the air chamber 2 respectively, guarantee the leakproofness of junction between sensor 4 and the air chamber 2, prevent that the gas in the air chamber 2 from revealing, influence the detection precision, can also improve the waterproof performance of air chamber 2.

Further, an air chamber cover 12 is further installed on the outer side face of the face shell 1, the air chamber cover 12 is provided with a plurality of groups of vent holes 121 corresponding to the pressure limiting holes 6 respectively, the air chamber cover 12 can protect the air chamber 2 to a certain degree, and air in the pressure limiting holes 6 can be exhausted out of the gas detector through the vent holes 121, so that the completeness of the structure of the gas detector is guaranteed.

Furthermore, a waterproof filtering membrane 13 is respectively arranged between the plurality of groups of vent holes 121 and the pressure limiting holes 6, and the waterproof filtering membrane 13 can prevent external water and dust from entering the air chamber 2 through the pressure limiting holes 6 and can keep the internal pressure of the air chamber 2 constant.

Further, the air chamber cover 12 is locked on the outer side surface of the face shell 1 through screws, so that the stability of installation of the air chamber cover 12 is guaranteed, and the air chamber cover is convenient to install and disassemble.

The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.