CN203572555U - Detection system used for gas meter - Google Patents
Detection system used for gas meter Download PDFInfo
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- CN203572555U CN203572555U CN201320586162.9U CN201320586162U CN203572555U CN 203572555 U CN203572555 U CN 203572555U CN 201320586162 U CN201320586162 U CN 201320586162U CN 203572555 U CN203572555 U CN 203572555U
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- vacuum pump
- gas
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- pump
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Abstract
The utility model discloses a detection system used for a gas meter. The detection system used for the gas meter comprises a detection unit and a pump gas unit, wherein a negative pressure pipeline and an outlet pipeline are connected between the detection system and the pump gas unit; the detection unit comprises a detection table, a stagnation container and a sound speed nozzle which are connected in sequence; the pump gas unit comprises a vacuum pump; one end of the vacuum pump is connected with the outlet pipeline; the other end of the vacuum pump is connected with the negative pressure pipeline; a frequency converting control device is connected to the exterior of the vacuum pump; the rotation speed of the vacuum pump is intelligently controlled by the frequency converting control device; the frequency converting control device is connected with a handheld mobile control terminal through wireless signal equipment. The detection system used for the gas meter has the advantages of the lower energy consumption, the economical efficiency, environmental protection, accurate measurement, intelligent control through frequency converting, and high portability.
Description
Technical field
The present invention relates to instrumentation field, relate to concretely a kind of gas flow instrument detection system.
Background technology
The method of Flow Standard Device With Standard Meter Method is a lot, and the gas flow standard device of making standard scale with sonic venturi (or claiming sonic nozzle) is wherein a kind of.With with other flowmeter, as standard scale, compare, with sonic nozzle, as standard scale, there is lot of advantages, as high in simple in structure, stable performance, accuracy, without movable member, easy to maintenance, calibration interval long (5 years) etc.Sonic nozzle method gas flow standard device is applicable to, to the detection of various gas flow accommodometers and calibration, can detect the flowmeter of mass flowmeter, velocity flowmeter, volumeter, spinner-type flowmeter, differential pressure flowmeter or other kind.
For example the larger standard set-up of throughput ratio, need select water-ring vacuum pump, therefore also needs cooling tower, centrifugal pump, underground tank, exhaust box.In order to adjust inlet gas flow field and to reduce noise, also should be in installation bellmouth entrance, porch, the front and back straight length of tested table is answered long enough.In addition, also should be equipped with power distribution cabinet, mobile intelligent terminal, meter-clamping apparatus, control system and data acquisition system (DAS).
The measurement gas that traditional apparatus for calibrating gas instrument is used is the atmosphere from outdoor suction, and the air that vacuum pump is discharged is also directly to outdoor discharge.No matter domestic or all use the vacuum pump of two types abroad at present for producing vacuum pump that negative pressure selects: water-ring vacuum pump and air ring type vacuum pump.These two kinds of vacuum pumps respectively have feature.
Its principle of water-ring vacuum pump is to utilize the to-and-fro movement of piston to carry out extracting air, the heat producing when the extracting air is come with recirculated water cooling, therefore be called liquid-ring type.This vacuum pump advantage is that the vacuum tightness that can reach is high, and pressure reduction ratio can reach 0.2.Shortcoming is that energy resource consumption is large, and when the required flow of calibrating and the rated flow gap of vacuum pump are when larger, pipeline needs bypass, otherwise vacuum pump can burn out.Owing to being to take exhaust with piston, when it extracts, the homogeneity of average discharge is poor on the other hand.
Air ring type vacuum pump is exactly centrifugal high pressure fan.It receives negative pressure chamber inlet scoop, and exhausr port is received to outside atmosphere.The advantage of this vacuum pump is lower with water-ring vacuum pump phase specific energy consumption, and the homogeneity of average discharge is better simultaneously.Shortcoming is that pipeline needs bypass when the required flow of calibrating and the rated flow gap of vacuum pump are when larger, otherwise vacuum pump can burn out equally.Its pressure reduction is than not enough on the other hand, and external product is the highest at present also can only reach to 0.7.More bigger when the pressure loss of accredited instrument, at the two ends of sonic nozzle, just cannot guarantee that pressure reduction is than the requirement of < 0.85, thereby limit the usable range of device.
No matter use the vacuum pump of that type, traditional apparatus for calibrating gas instrument have one maximum be also the defect of general character: owing to being to extract from outside atmosphere to the gas of calibrating use, and again to airborne release, this has just produced three problems: one is that the temperature of the air that extracts of calibrating is uncontrollable, be subject to the impact of outdoor temperature larger, although can revise with software, brought the additive error of corrected Calculation.Another is because air is to outside atmosphere discharge, when discharge, noise has also been led out, and has caused the noise pollution of environment.Another all cannot adopt converter technique.As adopt converter technique, for air ring type vacuum pump, the lower general who has surrendered of rotating speed declines rapidly the suction ability of pump, cannot meet calibrating requirement, for water-ring vacuum pump, when rotating speed declines, the homogeneity of its average discharge also worsens rapidly, can bring uncertain factor to calibrating, thereby make the data of calibrating produce error, affected the authority of calibrating data.Its shortcoming is low precision, and relative error, more than ± 20%, cannot be measured oil smoke flow simultaneously, and inconvenience realizes total amount charge.
Summary of the invention
According to the actual needs to the detection of gas flow instrument, and the problems referred to above that exist for the detection means of current employing, the purpose of this utility model is to be provided for the detection system of gas instrument, to realize the accurate measurement to gas flow instrument.
For solving the problems of the technologies described above, the technical solution adopted in the utility model is:
For a detection system for gas instrument, comprise detecting unit and pump gas unit; Between described detecting unit and pump gas unit, be connected with negative-pressure pipeline and outlet conduit, described detecting unit comprises monitor station position, stagnation container, the sonic nozzle connecting successively; Described pump gas unit comprises vacuum pump, described vacuum pump one end connection outlet pipeline, and the other end of described vacuum pump connects negative-pressure pipeline; The outside frequency-converting control device that connects of vacuum pump, the running speed of vacuum pump is by frequency-converting control device Based Intelligent Control, and described frequency-converting control device is by the hand-held mobile control terminal of wireless signal equipment connection.
Described outlet conduit is underground pipeline, and the region at described detecting unit place is confined space.
Between described vacuum pump and negative-pressure pipeline, be provided with air container.
The outer setting of described pump gas unit has sound-proof material.
Described vacuum pump is two to five Roots vaccum pumps that are arranged in parallel.
Described vacuum pump is three Roots vaccum pumps that are arranged in parallel.
Described wireless signal equipment is one or more in wifi, bluetooth, wlan equipment.
Between described sonic nozzle and negative-pressure pipeline, be provided with gas and open and close valve.
Between described monitor station position and stagnation container, be provided with gas flow accommodometer.
The present invention has following beneficial effect:
1, monitored area is given with sealing, sound-proof material is added in territory, pump gas area, make the noise in work can not be transmitted to the external world, avoided the noise pollution in environment;
2, the Flow channel of gas forms the closed-loop system of air-flow by underground logical channel, do not exchange with outside air, and the temperature of underground pipeline is comparatively invariable; Reduce the variation of the temperature difference, be conducive to guarantee the accurate of testing result;
3, vacuum pump is selected Roots vaccum pump in parallel, meets accuracy requirement and has reduced energy consumption;
4, by converter plant, come rotating speed and the operating number of vacuum pump, can be handling thereby reach economy and improved;
5, converter plant is controlled by mobile terminal by wireless signal equipment such as wifi, bluetooth, wlan, has improved portability.
Accompanying drawing explanation
Fig. 1 principle schematic of the present utility model;
The structural representation of Fig. 2 embodiment of the present utility model.
1---is surveyed area, territory, 2---pump gas area, 3---vacuum pump, 4---monitor station position, 5---gas flow accommodometer, 6----stagnation container, 7---sonic nozzle, 8---negative-pressure pipeline, 9---gas switching valve, 10---outlet conduit, 11---mobile terminal (containing wireless signal equipment), 12---frequency-converting control device, 13---accumulator unit.
Embodiment
Below in conjunction with accompanying drawing, embodiment is described in further detail the present invention.
As shown in Figure 1-2, the present invention is used for the detection system of gas instrument,
For a detection system for gas instrument, comprise detecting unit and pump gas unit; Between described detecting unit and pump gas unit, be connected with negative-pressure pipeline and outlet conduit, described detecting unit comprises monitor station position, stagnation container, the sonic nozzle connecting successively; Described pump gas unit comprises vacuum pump, described vacuum pump one end connection outlet pipeline, and the other end of described vacuum pump connects negative-pressure pipeline; The outside frequency-converting control device that connects of vacuum pump, the running speed of vacuum pump is by frequency-converting control device Based Intelligent Control, and described frequency-converting control device is by the hand-held mobile control terminal of wireless signal equipment connection.
Described outlet conduit is underground pipeline, and the region at described detecting unit place is confined space.And the inlet end of described outlet conduit is opened on this territory, pump gas area, to reduce the whole system noise pollution of environment to external world.
Between described vacuum pump and negative-pressure pipeline, be provided with air container.
The outer setting of described pump gas unit has sound-proof material.
Described vacuum pump is two to five Roots vaccum pumps that are arranged in parallel.
Described vacuum pump is three Roots vaccum pumps that are arranged in parallel.
Described wireless signal equipment is one or more in wifi, bluetooth, wlan equipment.
Between described sonic nozzle and negative-pressure pipeline, be provided with gas and open and close valve.
Between described monitor station position and stagnation container, be provided with gas flow accommodometer.
The present invention includes a closed surveyed area 1 and territory, a closed pump gas area 2, in territory, pump gas area 2 and be provided with three Roots vaccum pumps 3, surveyed area 1 is interior and be provided with two for laying the monitor station position 4 of flowmeter to be checked, monitor station position 4 is connected with flow control valve 5 in turn, stagnation container 6, one row's sonic nozzle 7, negative-pressure pipeline 8, on the two ends pipeline of sonic nozzle 7, be equipped with switch valve 9, and described flow control valve 5, stagnation container 6, sonic nozzle 7 and negative-pressure pipeline 8 part corresponding with sonic nozzle 7 is all arranged in described surveyed area 1, the remainder of negative-pressure pipeline 8 stretches out in outside surveyed area 1, and be communicated with described Roots vaccum pump 3 by pipeline, the exhausr port of Roots vaccum pump 3 is positioned at territory, described pump gas area 2, between territory 2, pump gas area and surveyed area 1, by being located at underground outlet conduit 10, be connected.Arrow direction indication in Fig. 1 is air current flow direction.
In addition, described Roots vaccum pump 3 is also connected with the frequency-converting control device 12 of being controlled by mobile intelligent terminal 11, and meanwhile, this mobile intelligent terminal 11 also connects the computer system main frame of the whole detection system for gas instrument.
Above an embodiment of the present utility model is had been described in detail, but described content is only preferred embodiment of the present utility model, can not be considered to for limiting practical range of the present utility model.All equalization variations of doing according to the utility model application range and improvement etc., within all should still belonging to patent covering scope of the present utility model.
Claims (9)
1. for a detection system for gas instrument, comprise detecting unit and pump gas unit; Between described detecting unit and pump gas unit, be connected with negative-pressure pipeline and outlet conduit, described detecting unit comprises monitor station position, stagnation container, the sonic nozzle connecting successively; Described pump gas unit comprises vacuum pump, described vacuum pump one end connection outlet pipeline, and the other end of described vacuum pump connects negative-pressure pipeline; It is characterized in that: the outside frequency-converting control device that connects of vacuum pump, the running speed of vacuum pump is by frequency-converting control device Based Intelligent Control, and described frequency-converting control device is by the hand-held mobile control terminal of wireless signal equipment connection.
2. the detection system for gas instrument according to claim 1, is characterized in that: described outlet conduit is underground pipeline, and the region at described detecting unit place is confined space.
3. the detection system for gas instrument according to claim 1, is characterized in that: between described vacuum pump and negative-pressure pipeline, be provided with air container.
4. the detection system for gas instrument according to claim 1, is characterized in that: the outer setting of described pump gas unit has sound-proof material.
5. the detection system for gas instrument according to claim 1, is characterized in that: described vacuum pump is two to five Roots vaccum pumps that are arranged in parallel.
6. the detection system for gas instrument according to claim 5, is characterized in that: described vacuum pump is three Roots vaccum pumps that are arranged in parallel.
7. the detection system for gas instrument according to claim 1, is characterized in that: described wireless signal equipment is one or more in wifi, bluetooth, wlan equipment.
8. the detection system for gas instrument according to claim 1, is characterized in that: between described sonic nozzle and negative-pressure pipeline, be provided with gas and open and close valve.
9. the detection system for gas instrument according to claim 1, is characterized in that: between described monitor station position and stagnation container, be provided with gas flow accommodometer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320586162.9U CN203572555U (en) | 2013-09-22 | 2013-09-22 | Detection system used for gas meter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320586162.9U CN203572555U (en) | 2013-09-22 | 2013-09-22 | Detection system used for gas meter |
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| Publication Number | Publication Date |
|---|---|
| CN203572555U true CN203572555U (en) | 2014-04-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201320586162.9U Expired - Fee Related CN203572555U (en) | 2013-09-22 | 2013-09-22 | Detection system used for gas meter |
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| CN (1) | CN203572555U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047858A (en) * | 2014-06-16 | 2014-09-17 | 项敏 | Roots atmosphere direct-exhausting smart machine unit |
-
2013
- 2013-09-22 CN CN201320586162.9U patent/CN203572555U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104047858A (en) * | 2014-06-16 | 2014-09-17 | 项敏 | Roots atmosphere direct-exhausting smart machine unit |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140430 Termination date: 20140922 |
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| EXPY | Termination of patent right or utility model |