CN206311581U - A kind of gas-detecting cavity body structure - Google Patents
A kind of gas-detecting cavity body structure Download PDFInfo
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- CN206311581U CN206311581U CN201621456843.3U CN201621456843U CN206311581U CN 206311581 U CN206311581 U CN 206311581U CN 201621456843 U CN201621456843 U CN 201621456843U CN 206311581 U CN206311581 U CN 206311581U
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Abstract
The utility model is related to a kind of gas-detecting cavity body structure.Using gas-detecting cavity body structure of the present utility model detector when in use, air-flow to be measured circulates in gas channel and causes negative pressure in signalling channel, the difference of the malleation value in inlet channel of the differential pressure pickup by detection mouth to negative pressure value with air curtain is detected, corresponding controller controls the flow of air curtain according to the difference signal of differential pressure pickup, the difference for making differential pressure pickup is finally zero, clean gas so in air curtain just compensate for the negative pressure in signalling channel, make to be full of clean gas all the time in signalling channel, the respective element avoided in signalling channel is contaminated, the flow of air curtain carries out dynamic regulation according to the signal of differential pressure pickup simultaneously, the negative pressure value for making the air-flow in air curtain cause in signalling channel with air-flow to be measured reaches dynamic equilibrium, avoid that air curtain flow is excessive or the too small harmful effect for causing.
Description
Technical field
The utility model is related to a kind of gas-detecting cavity body structure.
Background technology
For the instrument of the detection of dusty circumstances, whether using optical method detection or ultrasound checking, dust all can
Detecting element to instrument is polluted, and influences the precision of detection and the life-span of instrument.
Also have in the prior art some increase before detecting element the method for air curtain by detecting element be detected
Gas barrier, to avoid detecting element from being polluted by dust in detected gas, but after setting air curtain, if in air curtain
Flow is excessive, and excessive air can be made to be mixed into gas to be detected, and large effect is caused to testing result, if the stream of air curtain
Amount is too small, and suitable isolation effect is not reached again.
Utility model content
The purpose of this utility model is to provide a kind of gas-detecting cavity body structure, so that the air curtain flow of gas detecting instrument
Can adjust, it is to avoid the flow of air curtain is excessive or the too small harmful effect for causing.
To achieve the above object, gas-detecting cavity body structure of the present utility model is adopted the following technical scheme that：Gas is detected
Cavity body structure, including be provided with the housing of gas channel and be respectively arranged on the detector transmitting-receiving subassembly of gas channel both sides, housing
Also it is provided with logical in air-flow in the signalling channel arranged in a crossed manner with gas channel, signalling channel between two detector transmitting-receiving subassemblies
Isolation window is respectively equipped between road and two detector transmitting-receiving subassemblies, on the inwall of signalling channel isolation window and gas channel it
Between be provided with air curtain gas outlet, be additionally provided with the inwall of signalling channel for corresponding differential pressure pickup connection so that pressure difference sensing
The difference of the malleation value in inlet channel of the negative pressure value with air curtain that device can cause to air-flow to be measured in signalling channel is carried out
The detection mouth of detection.
The gas channel is venturi passage, and the signalling channel is intersected with the throat of venturi passage.
Signalling channel is provided with necking section of the osculum towards gas channel between isolation window and gas channel.
The housing includes being provided with the middle matrix of " ten " font passage, and the vertical section of " ten " font passage constitutes the gas
Circulation road, the two ends of the horizontal segment of " ten " font passage are provided with joint, and joint has the inner chamber of left and right insertion, the inner chamber of joint
The signalling channel is collectively formed with horizontal segment passage, the isolation window and air curtain gas outlet are arranged in joint inner chamber.
The beneficial effects of the utility model are：Used using the detector of gas-detecting cavity body structure of the present utility model
When, air-flow to be measured circulates in gas channel and causes negative pressure in signalling channel, and differential pressure pickup is by detection mouth to negative pressure
The difference of the malleation value in value and the inlet channel of air curtain is detected that corresponding controller is believed according to the difference of differential pressure pickup
The flow of number control air curtain, make differential pressure pickup difference it is final be zero, the clean gas in such air curtain just compensate for letter
Negative pressure in number passage, make to be full of clean gas all the time in signalling channel, it is to avoid the respective element in signalling channel is subject to dirt
Dye, while the flow of air curtain carries out dynamic regulation according to the signal of differential pressure pickup, makes the air-flow in air curtain exist with air-flow to be measured
The negative pressure value caused in signalling channel reaches dynamic equilibrium, it is to avoid air curtain flow is excessive or the too small harmful effect that causes；
Further, gas channel venturi passage, signalling channel is intersected with the throat of venturi passage, venturi passage
The negative pressure that air-flow to be measured causes in signalling channel can be strengthened, can thus strengthen the flow of air curtain, enhancing air curtain every
From effect；
Further, signalling channel is provided with necking section of the osculum towards gas channel between isolation window and gas channel,
So there are certain guide functions to the air-flow in air curtain；
Further, the housing includes being provided with the middle matrix of " ten " font passage, the vertical section of " ten " font passage
The gas channel is constituted, the two ends of the horizontal segment of " ten " font passage are provided with joint, and joint has the inner chamber of left and right insertion,
The inner chamber of joint and horizontal segment passage collectively form the signalling channel, and the isolation window and air curtain gas outlet are arranged in joint
In chamber, each part of housing is so set to process simple, it is easy to assembly.
Brief description of the drawings
Fig. 1 is the structural representation of the embodiment of gas-detecting cavity body structure of the present utility model；
Fig. 2 is the use state schematic diagram of Fig. 1；
In accompanying drawing：1st, flow control valve；2nd, differential pressure transmitter；3rd, joint；4th, middle matrix；5th, lens；6th, air pump；31、
Necking section；41st, gas channel；42nd, signalling channel.
Specific embodiment
Implementation method of the present utility model is described further below in conjunction with the accompanying drawings.
The embodiment of gas-detecting cavity body structure of the present utility model as shown in Figure 1, 2, including gas examine by gas detecting instrument
Cavity body structure is surveyed, gas-detecting cavity body structure includes middle matrix 4, and middle matrix 4 is provided with " ten " font passage, " ten " font
Passage vertical section is the gas channel 41 for passing through for air-flow to be measured, and gas channel 41 is venturi passage, so in air-flow
During circulation, the larger negative pressure of pressure value can be produced in the throat location of venturi passage.The horizontal segment of " ten " font passage
With the throat location that gas channel is intersected in venturi passage, the two ends of horizontal segment passage are fitted with joint 3, joint 3
With necking section 31, towards gas channel 41, the end of big mouth is provided with lens 5, lens 5 and joint 3 to the osculum of necking section 31
The sealing everywhere of inner chamber is set, and forms isolation window, and the structure of two joints is identical.Two joint inner chambers and " ten " of middle matrix
Channel connection on the left and right directions of font passage, forms the signalling channel 42 for passing through for detection signal.
The air curtain air outlet for being blown out for clean air and forming air curtain is equipped with two joints, air curtain air outlet is located at necking
On the inwall of section at the position of lens 5, air pump 6 is connected on joint 3 by pipeline and is connected with air curtain air outlet, and
Pipeline is provided with flow control valve 1.The low-pressure end of differential pressure transmitter 2 is connected by pipeline with the necking section of joint 3, and high-pressure side leads to
Cross pipeline to be connected on the pipeline in the downstream of flow control valve 1, such differential pressure transmitter 2 can just measure the necking of joint 3
Difference between the malleation value of the inlet channel of negative pressure value and air curtain in section.The control of flow control valve 1 and differential pressure transmitter 2
Circuit is connected with the CPU of instrument, and such CPU controls flow control valve 1 according to the detection signal of differential pressure transmitter, makes by stream
The flow of the air of adjustable valve 1 becomes big or diminishes.
When gas detecting instrument is detected, air-flow to be measured flows from gas channel, in the presence of venturi passage
Throat produces negative pressure, and negative pressure is also produced in the necking section for so making joint, and CPU is detected in tapered channel by differential pressure transmitter
Negative pressure value is more than the malleation value of the inlet channel of air curtain, and CPU sends signal control flow control valve opening and becomes big, makes the stream of air curtain
Quantitative change is big, and such air curtain diminishes into negative pressure value after necking section, and then differential pressure transmitter is detected and by detection signal herein
CPU is passed to, until the detected value of differential pressure transmitter is zero, now the clean air in the inlet channel of air curtain just can be more
The negative pressure that air-flow to be measured causes is mended, due to being full of clean air all the time in necking section, gas to be detected is avoided along signal
Passage is spread, and lens are polluted, and CPU realizes the dynamic adjustment of air curtain flow by differential pressure transmitter and flow control valve,
Excessive clean air is mixed into gas channel when avoiding air curtain flow excessive, and large effect is caused to testing result, is also kept away
Exempted from air curtain flow it is excessive when air curtain isolation effect difference problem.Because the air curtain flow of gas detecting instrument can be according to be measured
The negative pressure that air-flow causes enters Mobile state adjustment, influence very little of the air curtain to testing result, therefore gas detecting instrument can be to super
Lower range dust concentration（0~5mg/ m3）Gas detected.
In the above-described embodiments, it is to strengthen air-flow to be measured in signalling channel gas channel to be set into venturi passage
In the negative pressure that causes, the flow of air curtain is also accordingly increased, improve the isolation effect of air curtain, implement at other certainly
Gas channel can also be set to cylindrical channel in example；The inner chamber of joint is set to the inner chamber of taper, makes the inner chamber of joint
With certain guide functions, in other embodiments, it is also possible to which the inner chamber of joint is set to plain cylindrical form inner chamber；Gas
The detector emitting module and receiving unit of detector can be set to laser and laser detector, this makes it possible to carry out
The detection of dust concentration, it is, of course, also possible to detector element is used into ultrasound examination component, now the gas detecting instrument is with regard to energy
The detection of gas flow is enough carried out, other facilitate the detection of data it is, of course, also possible to carry out gas using other detecting elements.
Claims (4)
1. gas-detecting cavity body structure, it is characterised in that：Including being provided with the housing of gas channel and being respectively arranged on gas channel
The detector transmitting-receiving subassembly of both sides, housing is also provided with the letter arranged in a crossed manner with gas channel between two detector transmitting-receiving subassemblies
Isolation window is respectively equipped between gas channel and two detector transmitting-receiving subassemblies in number passage, signalling channel, signalling channel
Air curtain gas outlet is provided with inwall between isolation window and gas channel, be additionally provided with the inwall of signalling channel for it is corresponding
Differential pressure pickup is connected so that the negative pressure value that can cause in signalling channel to air-flow to be measured of differential pressure pickup and air curtain enter
The detection mouth that the difference of the malleation value in gas passage is detected.
2. gas-detecting cavity body structure according to claim 1, it is characterised in that：The gas channel is logical for venturi
Road, the signalling channel is intersected with the throat of venturi passage.
3. gas-detecting cavity body structure according to claim 1 and 2, it is characterised in that：Signalling channel is in isolation window and gas
Necking section of the osculum towards gas channel is provided between circulation road.
4. gas-detecting cavity body structure according to claim 3, it is characterised in that：The housing includes being provided with " ten " font
The middle matrix of passage, the vertical section of " ten " font passage constitutes the gas channel, the two of the horizontal segment of " ten " font passage
End is provided with joint, and joint has the inner chamber of left and right insertion, and the inner chamber of joint and horizontal segment passage collectively form the signal and lead to
Road, the isolation window and air curtain gas outlet are arranged in joint inner chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621456843.3U CN206311581U (en) | 2016-12-28 | 2016-12-28 | A kind of gas-detecting cavity body structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201621456843.3U CN206311581U (en) | 2016-12-28 | 2016-12-28 | A kind of gas-detecting cavity body structure |
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| Publication Number | Publication Date |
|---|---|
| CN206311581U true CN206311581U (en) | 2017-07-07 |
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ID=59247417
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201621456843.3U Active CN206311581U (en) | 2016-12-28 | 2016-12-28 | A kind of gas-detecting cavity body structure |
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| Country | Link |
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| CN (1) | CN206311581U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770960A (en) * | 2016-12-28 | 2017-05-31 | 郑州光力科技股份有限公司 | Gas-detecting cavity body structure |
| CN113857012A (en) * | 2021-09-27 | 2021-12-31 | 常熟五临天光电科技有限公司 | Illumination processing system convenient to air is got rid of |
-
2016
- 2016-12-28 CN CN201621456843.3U patent/CN206311581U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106770960A (en) * | 2016-12-28 | 2017-05-31 | 郑州光力科技股份有限公司 | Gas-detecting cavity body structure |
| CN113857012A (en) * | 2021-09-27 | 2021-12-31 | 常熟五临天光电科技有限公司 | Illumination processing system convenient to air is got rid of |
| CN113857012B (en) * | 2021-09-27 | 2023-07-28 | 常熟五临天光电科技有限公司 | Illumination processing system convenient to air is got rid of |
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Address after: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee after: Power Polytron Technologies Inc Address before: 450001 Henan city of Zhengzhou province high tech Industrial Development Zone Long Chun Road No. 10 Patentee before: Zhengzhou GL Tech Company |