CN105004389A - Thermal-conduction flowmeter - Google Patents
Thermal-conduction flowmeter Download PDFInfo
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- CN105004389A CN105004389A CN201510202380.1A CN201510202380A CN105004389A CN 105004389 A CN105004389 A CN 105004389A CN 201510202380 A CN201510202380 A CN 201510202380A CN 105004389 A CN105004389 A CN 105004389A
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- heating tube
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Abstract
The invention relates to a thermal-conduction flowmeter which belongs to the technical field of measuring instruments. The thermal-conduction flowmeter comprises a measuring main pipe, a fluid inlet pipe, a fluid outlet pipe, a heating pipe, five temperature sensors, a current measuring instrument, a power supply, a calculating controller, a wire harness and a heat-insulation layer. The fluid inlet pipe is a quadrature pipe, the inlet of the fluid inlet pipe and the outlet of the fluid outlet pipe are both arranged in the measuring main pipe, the heat-insulation layer wraps the outer wall surface of the heating pipe, two ends of the heating pipe are respectively connected with the outlet of the fluid inlet pipe and the outlet of the fluid outlet pipe, and the fifth temperature sensor is arranged on the heat-insulation layer. According to the difference between the temperature of the fluid in front of the heating pipe and the temperature of the fluid at the back of the heating pipe and the current through the heating pipe, the weight of the fluid which flows through the heating pipe can be calculated, and therefore the weight of the fluid which flows through the measuring main pipe can be calculated. The thermal-conduction flowmeter is reasonable in design and simple in structure, and is suitable for measuring the weight of the fluid accurately.
Description
Technical field
The invention belongs to surveying instrument equipment technical field, specifically, is a kind of thermal conductivity flowmeter that heat transfer theory can be utilized to carry out flow measurement.
Background technology
So-called flow, refers in the unit interval Fluid Volume flowing through closed conduct or open channel free area, also known as instantaneous delivery.Volumetric flow rate is called when Fluid Volume represents with volume; When Fluid Volume is called mass rate with during quality representation.Flow through the volume of the fluid of a certain segment pipe in unit interval, be called the volumetric flow rate of this xsect.When incompressible fluid makes Steady Flow, constant by the flow in each cross section of same flow pipe.Measurement is carried out to the flow of the fluid flowed in a routing and is referred to as flow metering.The fluid of flow measurement is diversified, as measuring object has gas, liquid, fluid-mixing; The temperature of fluid, pressure, flow all have larger difference, and the accuracy of measurement of requirement is also different.Therefore, the task of flow measurement is exactly that the measuring condition such as kind, flow state, measurement place of detected fluid, studies various corresponding measuring method according to measurement object, and the correct transmission of guaranteed flow value.Flowmeter, national scientific and technical terminology validation board is defined as it: instruction measured flux is in the instrument of selected time interval inner fluid total amount.Be exactly a kind of instrument for fluid flow in measuring channel or open channel in simple terms, conventional unit m3/h in engineering, it can be divided into instantaneous delivery and integrated flow, instantaneous delivery and the unit interval interior amount crossing closed conduct or open channel free area, the material flow through can be gas, liquid, solid; Integrated flow is the cumulative amount flowing through closed conduct or open channel free area at a certain section of time interval endosome.Also integrated flow can be tried to achieve to time integral, so also can mutually transform between instantaneous flowmeter and flow quantity recorder by instantaneous delivery.Flowmeter is divided into again differential pressure flowmeter, spinner-type flowmeter, restriction flowmeter, slit flowmeter, volume-displacement, electromagnetic flowmeter, ultrasonic flow meter etc.
In existing flowmeter, differential pressure flowmeter, restriction flowmeter price comparison are cheap, but measuring accuracy is not high; Electromagnetic flowmeter, ultrasonic flow rate measurement accuracy of measurement are high, but price is very expensive again.Exploitation low price, the flowmeter that measuring accuracy is high is the trend of flowmeter development.
Summary of the invention
In order to overcome the shortcoming of prior art, the invention provides a kind of thermal conductivity flowmeter, on low-cost basis, higher measuring accuracy can be had.
The present invention is achieved through the following technical solutions, the present invention includes and measure house steward, fluid enters pipe, fluid effuser, heating tube, first temperature sensor, second temperature sensor, current measuring instrument, power supply, computing controller, wire harness, heat-insulation layer, three-temperature sensor, 4th temperature sensor, 5th temperature sensor, measure house steward and be connected with existing fluid source, it is ell that fluid enters pipe, and fluid enters the entrance of pipe, the outlet of fluid effuser is arranged in measures in house steward, and the two ends of heating tube enter the outlet of pipe respectively with fluid, the import of fluid effuser is connected, the first temperature sensor, three-temperature sensor is arranged in the import that fluid enters also close heating tube in pipe, the second temperature sensor, 4th temperature sensor is arranged in the outlet also near heating tube in fluid effuser, and heat-insulation layer is wrapped in the outside wall surface of heating tube, and the 5th temperature sensor is arranged on heat-insulation layer, heating tube, first temperature sensor, second temperature sensor, current measuring instrument, power supply, computing controller, three-temperature sensor, 4th temperature sensor, be connected by wire harness between 5th temperature sensor.
Further, fluid enters pipe in the present invention, fluid effuser, heating tube be uniform cross section pipe, fluid enter pipe, fluid effuser, heating tube internal diameter identical.
The invention has the beneficial effects as follows: the present invention is reasonable in design, structure is simple; Heat transfer theory that can be basic, just can realize high-precision flow measurement.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the structural representation of A-A section in Fig. 1;
Label in accompanying drawing is respectively: 1, measure house steward, and 2, fluid enters pipe, 3, fluid effuser, 4, heating tube, the 5, first temperature sensor, the 6, second temperature sensor, 7, current measuring instrument, 8, power supply, 9, computing controller, 10, wire harness, 11, heat-insulation layer, 12, three-temperature sensor, the 13, the 4th temperature sensor, the 14, the 5th temperature sensor.
Embodiment
Elaborate to embodiments of the invention below in conjunction with accompanying drawing, the present embodiment, premised on technical solution of the present invention, give detailed embodiment and concrete operating process, but protection scope of the present invention is not limited to following embodiment.
embodiment
Embodiments of the invention as depicted in figs. 1 and 2, the present invention includes and measure house steward 1, fluid enters pipe 2, fluid effuser 3, heating tube 4, first temperature sensor 5, second temperature sensor 6, current measuring instrument 7, power supply 8, computing controller 9, wire harness 10, heat-insulation layer 11, three-temperature sensor 12, 4th temperature sensor 13, 5th temperature sensor cloth 14, measure house steward 1 and be connected with existing fluid source, it is ell that fluid enters pipe 2, and fluid enters the entrance of pipe 2, the outlet of fluid effuser 3 is arranged in measures in house steward 1, and the two ends of heating tube 4 enter the outlet of pipe 2 respectively with fluid, the import of fluid effuser 3 is connected, the first temperature sensor 5, three-temperature sensor 12 is arranged in the import that fluid enters also close heating tube 4 in pipe 2, the second temperature sensor 6, 4th temperature sensor 13 is arranged in the outlet also near heating tube 4 in fluid effuser 3, and heat-insulation layer 11 is wrapped in the outside wall surface of heating tube 4, and the 5th temperature sensor cloth 14 is arranged on heat-insulation layer 11, heating tube 4, first temperature sensor 5, second temperature sensor 6, current measuring instrument 7, power supply 8, computing controller 9, three-temperature sensor 12, 4th temperature sensor 13, be connected by wire harness 10 between 5th temperature sensor cloth 14, fluid enters pipe 2, fluid effuser 3, heating tube 4 are uniform cross section pipe, fluid enter pipe 2, fluid effuser 3, heating tube 4 internal diameter identical.
In implementation process of the present invention, basic heat transfer principle Q=C*M* Δ T is used.Flow through heating tube 4 fluid add heat Q by heating tube 4 resistance known and current measuring instrument 7 survey galvanometer and calculate, C is determined by the characteristic of known fluid, Δ T is recorded by the temperature sensor before and after heating tube 4, just can be calculated in the unit interval circulation quality flowing through heating tube 4 like this by computing controller 9.Enter pipe 2 according to fluid and enter pipe 2 position in measurement house steward with the internal diameter ratio and fluid of measuring house steward 1, just can calculate the mass rate measuring house steward 1 inner fluid.Heat-insulation layer 11 is wrapped in the outside wall surface of heating tube 4, can improve computational accuracy.The inlet temperature of heating tube 4 can be obtained by the first temperature sensor 5, three-temperature sensor 12 measured temperature mean value calculation, and the outlet temperature of heating tube 4 can be obtained by the second temperature sensor 6, the 4th temperature sensor 13 measured temperature mean value calculation.By the 5th temperature sensor cloth 14, the heat flow to by heating tube 4 in environment can be calculated.
Claims (2)
1. a thermal conductivity flowmeter, comprises and measures house steward (1), fluid enters pipe (2), fluid effuser (3), measures house steward (1) and is connected with existing fluid source, it is characterized in that, also comprise heating tube (4), first temperature sensor (5), second temperature sensor (6), current measuring instrument (7), power supply (8), computing controller (9), wire harness (10), heat-insulation layer (11), three-temperature sensor (12), 4th temperature sensor (13), 5th temperature sensor (14), it is ell that fluid enters pipe (2), and fluid enters the entrance of pipe (2), the outlet of fluid effuser (3) is arranged in measures in house steward (1), and the two ends of heating tube (4) enter the outlet of managing (2) respectively with fluid, the import of fluid effuser (3) is connected, the first temperature sensor (5), three-temperature sensor (12) is arranged in the import that fluid enters also close heating tube (4) in pipe (2), the second temperature sensor (6), 4th temperature sensor (13) is arranged in the outlet also near heating tube (4) in fluid effuser (3), heat-insulation layer (11) is wrapped in the outside wall surface of heating tube (4), 5th temperature sensor (14) is arranged on heat-insulation layer (11), heating tube (4), first temperature sensor (5), second temperature sensor (6), current measuring instrument (7), power supply (8), computing controller (9), three-temperature sensor (12), 4th temperature sensor (13), be connected by wire harness (10) between 5th temperature sensor (14).
2. thermal conductivity flowmeter according to claim 1, it is characterized in that fluid enters pipe (2), fluid effuser (3), heating tube (4) are uniform cross section pipe, fluid enter pipe (2), fluid effuser (3), heating tube (4) internal diameter identical.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510202380.1A CN105004389A (en) | 2015-04-19 | 2015-04-19 | Thermal-conduction flowmeter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510202380.1A CN105004389A (en) | 2015-04-19 | 2015-04-19 | Thermal-conduction flowmeter |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN105004389A true CN105004389A (en) | 2015-10-28 |
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ID=54377150
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201510202380.1A Pending CN105004389A (en) | 2015-04-19 | 2015-04-19 | Thermal-conduction flowmeter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN105004389A (en) |
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2015
- 2015-04-19 CN CN201510202380.1A patent/CN105004389A/en active Pending
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| Date | Code | Title | Description |
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| C06 | Publication | ||
| PB01 | Publication | ||
| WD01 | Invention patent application deemed withdrawn after publication |
Application publication date: 20151028 |
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| WD01 | Invention patent application deemed withdrawn after publication |