CN203132618U - Flow measurement trolley for low-pressure and high-flow-velocity air - Google Patents
Flow measurement trolley for low-pressure and high-flow-velocity air Download PDFInfo
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- CN203132618U CN203132618U CN 201320054118 CN201320054118U CN203132618U CN 203132618 U CN203132618 U CN 203132618U CN 201320054118 CN201320054118 CN 201320054118 CN 201320054118 U CN201320054118 U CN 201320054118U CN 203132618 U CN203132618 U CN 203132618U
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Abstract
A flow measurement trolley for low-pressure and high-flow-velocity air comprises a trolley body and is characterized in that an air inlet end, a filter (3), a two-position three-way switch valve (4), a fine pressure adjusting valve (1), a pressure gauge (6), a thermal mass flowmeter (2), a switch valve (7) and an air outlet end are sequentially connected through pipelines in the trolley body, a flow display instrument (E1) is connected with the thermal mass flowmeter (2) in an external mode, a heating electric circuit is provided with a switch (E3) and a light-emitting diode (LED) indicating lamp, the switch valve (7) is connected with a fine digital pressure gauge (E2), the fine pressure adjusting valve (1) is provided with a silencer (5), the air inlet end is connected with an air source in an external mode, and the air outlet end is connected with a part to be measured in an external mode. The flow measurement trolley for the low-pressure and high-flow-velocity air is high in measurement accuracy, a flow indicating value does not need to be converted, the flow instrument can achieve correction and is low in weight, and the flow measurement trolley for the low-pressure and high-flow-velocity air can be conveniently moved.
Description
Technical field
The utility model relates to a kind of flow measurement device, especially relates to a kind of low pressure high flow rate air-flow measurement car that substitutes traditional mechanical floats flowmeter with thermal mass flow meter.
Background technology
Measuring in the field of air mass flow, the mechanical floats flowmeter is simple with its principle of work, be easy to safeguard, economical and practical etc., and advantage is used widely in industrial circle.
But traditional mechanical floats flowmeter under low-pressure, high flow rate, big flow rate test condition owing to the design feature of himself is brought the bigger pressure loss, although can be by taking some innovative approachs as reducing the elbow on the gas circuit, gas circuit pipeline inner wall along the line is smooth, minimizing reducing link etc. reduces crushing as far as possible, but can't obtain higher measuring accuracy because the pressure loss is big eventually; And because the suspended body flowmeter use is mechanical rule (or index dial), the scale that identifies on it is demarcated under a certain specified temp and pressure condition, thereby also just define the use occasion of this flowmeter, when under non-scale state, using, it is very big directly to read the flow deviation of reading, just can obtain the actual flow value after must converting by the correction formula that is provided by producer, this has brought great inconvenience for a line operator use.
Development along with technology, flow rate test is had higher requirement, and traditional mechanical suspended body flowmeter is when using under the measurement of big flow and diversified test condition, and its limitation shows especially day by day, is difficult to realize the flow measurement of degree of precision under the low pressure high flow condition.
The utility model content
Technical problem to be solved in the utility model just provides a kind of low pressure high flow rate air-flow measurement car that can realize the degree of precision flow measurement under the low pressure high flow condition, and can satisfy convenient application the under the diversified test condition.
Solve the problems of the technologies described above, the technical solution adopted in the utility model is as follows:
A kind of low pressure high flow rate air-flow measurement car, comprise car body, it is characterized in that: connect inlet end successively with pipeline in the described car body, filtrator 3,23 logical switch valves 4, meticulous pressure-regulating valve 1, tensimeter 6, thermal mass flow meter 2, switch valve 7 and outlet side, described thermal mass flow meter 2 is circumscribed with flow displaying instrument E1, add thermoelectric loop and be provided with switch E3 and LED light, be connected to precision digital tensimeter E2 on the described switch valve 7, on the described meticulous pressure-regulating valve 1 sound suppressor 5 is housed, the external source of the gas of described inlet end, external to be measured of outlet side.
The utility model replaces traditional mechanical floats flowmeter with thermal mass flow meter, digital pressure gauge with precision substitutes the mechanical pointer tensimeter, select meticulous pressure adjustment assembly and filtration unit etc. for use, erect a simple and practical and economic gas flow measurement system.
The basic functional principle of thermal mass flow meter is such, a section metal capillary is arranged in flowmeter inside, twine resistive heater uniformly at peripheral center section capillaceous, in the metal tube both sides apart from heater strip two thermo detectors in the equidistant tube wall place welding, when flowmeter was switched on, metal capillary was heated by resistive heater, when not having air-flow to pass through metal tube, because temperature is symmetrical distribution on the metal tube, the temperature difference of two points for measuring temperature is zero; When a certain amount of air-flow flowed into metal tube and flows out from endpiece from inlet end, because the temperature of air-flow is lower than metal tube, thereby gas absorbed the heat of metal tube when flowing through in the porch, thereby makes this place temperature reduction; At airflow outlet end, the temperature of air-flow is higher than the temperature of metal tube, thereby this place's temperature is raise; Experimental results show that in outlet and the temperature difference of porch it is the function of the thermal capacity of the quality of the gas that flows through and gas, and certain The Thermal Capacity of Gaseous amount is when temperature variation is not too big, basic is constant, thereby can come the mass rate of measurement gas by the difference of this temperature of sensing, the basic functional principle of Here it is thermal mass flow meter.The temperature of the shop air that is provided by air compressor machine is more stable within the specific limits, again because thermal mass flow meter is insensitive to the pressure of tested gas, thereby and the pressure loss little requirement that reduced upstream source of the gas of air-flow during by flowmeter, thereby when the pressure of tested gas changes in wideer scope, flowmeter all can reach higher precision, experimental results show that this kind flowmeter is well suited for our use situation at present.
Beneficial effect: the feature of flow rate test car of the present utility model is mainly reflected in four aspects:
1, measuring accuracy height
Pressure and flow measurement precision all are improved, and the pressure loss is little;
2, the flow indicating value need not to convert
All can directly read actual mass rate and need not from Displaying Meter when under different temperature and pressure conditions, carrying out flow rate test and convert, use very convenient;
3, flow instrument can be realized calibration
Can calibrate flowmeter by the value that changes inner parameter with the read out instrument of the matching used electronic type of thermal mass flow meter, thereby guarantee that whole Flow Measuring System reaches higher measuring accuracy.And with the matching used fixing index dial of traditional mechanical type suspended body flowmeter, owing to can't realize adjusting, the method of modified value that can only be by providing each measurement point is revised to guarantee the precision measured and do so flowmeter itself to be realized adjustment to each measured value one by one.
4, in light weight, be convenient to mobile
The suspended body flowmeter volume of surveying big flow is big, heavy.And long-pending little, in light weight, the compact conformation of flow rate test car body of the present utility model, personnel's push-and-pull easy to use is to the flow rate test scene.
Description of drawings
Fig. 1 is the three-dimensional appearance synoptic diagram of flow rate test car of the present utility model;
Fig. 2 is that the gas circuit of flow rate test vehicle flowrate of the present utility model is formed and the annexation synoptic diagram;
Fig. 3 is flow rate test vehicle flowrate circuit diagram of the present utility model.
Among the figure: the meticulous pressure-regulating valve of 1-, 2-thermal mass flow meter, 3-filtrator, 4-2 position 3 logical switch valves, 5-sound suppressor, 6-tensimeter, 7-switch valve, to be measured of 8-, E1-flow displaying instrument, E2-precision digital tensimeter, E3-switch E3.
Embodiment
As Fig. 1, Fig. 2 and shown in Figure 3, low pressure high flow rate air-flow measurement car embodiment of the present utility model, comprise car body, connect inlet end, filtrator 3,23 logical switch valves 4, meticulous pressure-regulating valve 1, tensimeter 6, thermal mass flow meter 2, switch valve 7 and outlet sides successively with pipeline in the car body, thermal mass flow meter 2 is circumscribed with flow displaying instrument E1, add thermoelectric loop is provided with switch E3 and LED light (see figure 3), be connected to precision digital tensimeter E2 on the switch valve 7, on the meticulous pressure-regulating valve 1 sound suppressor 5 be housed.
Low pressure high flow rate air-flow measurement car inlet end connects shop air, low pressure high flow rate air-flow measurement car outlet side connects test specimen 8 to be measured, low pressure high flow rate air-flow measurement car cable connects workshop power supply 220V/50Hz, the force value in shop air exit transfers to a little more than the testing pressure conditional value in advance by pressure regulator valve, opens the steam supply valve at shop air place then; Press low pressure high flow rate air-flow measurement car power knob E3, the bright power connection that shows of green power supply pilot lamp E3.Rotary switch valve 4 is to the standard-sized sheet position.Open pressure meter switch valve 7 to the standard-sized sheet position, tensimeter E2 shows that the current pressure value is 0; Slowly opening pressure variable valve 1 makes tensimeter E2 reading reach the pressure condition of flow rate test.When tensimeter E2 stable reading, flowmeter instrument E1 shows the MAF of current reality.
Claims (1)
1. low pressure high flow rate air-flow measurement car, comprise car body, it is characterized in that: connect inlet end successively with pipeline in the described car body, filtrator (3), 23 logical switch valves (4), meticulous pressure-regulating valve (1), tensimeter (6), thermal mass flow meter (2), switch valve (7) and outlet side, described thermal mass flow meter (2) is circumscribed with flow displaying instrument (E1), add thermoelectric loop and be provided with switch (E3) and LED light, be connected to precision digital tensimeter (E2) on the described switch valve (7), sound suppressor (5) is housed, the external source of the gas of described inlet end on the described meticulous pressure-regulating valve (1), external to be measured of outlet side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320054118 CN203132618U (en) | 2013-01-30 | 2013-01-30 | Flow measurement trolley for low-pressure and high-flow-velocity air |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320054118 CN203132618U (en) | 2013-01-30 | 2013-01-30 | Flow measurement trolley for low-pressure and high-flow-velocity air |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203132618U true CN203132618U (en) | 2013-08-14 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201320054118 Expired - Lifetime CN203132618U (en) | 2013-01-30 | 2013-01-30 | Flow measurement trolley for low-pressure and high-flow-velocity air |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203132618U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615435A (en) * | 2013-11-29 | 2014-03-05 | 常德中联重科液压有限公司 | Hydraulic oil flow testing device |
-
2013
- 2013-01-30 CN CN 201320054118 patent/CN203132618U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103615435A (en) * | 2013-11-29 | 2014-03-05 | 常德中联重科液压有限公司 | Hydraulic oil flow testing device |
| CN103615435B (en) * | 2013-11-29 | 2015-09-30 | 常德中联重科液压有限公司 | Hydraulic fluid flow rate testing apparatus |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130814 |
|
| CX01 | Expiry of patent term |