CN2564996Y - Large range heat balance type flow sensor - Google Patents
Large range heat balance type flow sensor Download PDFInfo
- Publication number
- CN2564996Y CN2564996Y CN 02275171 CN02275171U CN2564996Y CN 2564996 Y CN2564996 Y CN 2564996Y CN 02275171 CN02275171 CN 02275171 CN 02275171 U CN02275171 U CN 02275171U CN 2564996 Y CN2564996 Y CN 2564996Y
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- pass
- passage
- main channel
- thermal resistance
- flow sensor
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Abstract
The utility model discloses a large measuring range heat balance type flow sensor which is provided with a main passage 1. A by-pass passage 2 is connected with the main passage 1; the connection of the by-pass passage 2 and the main passage 1 is resepectively provided with a by-pass passage inlet 3 and a by-pass passage outlet 4; the sectional area of the by-pass passage 2 is smaller than the sectional area of the main passage 1, and the length of the by-pass passage 2 is longer than the distance from the by-pass passage inlet 3 to the by-pass passage outlet 4 of the main passage; the inner parts of the main passage 1 and the by-pass passage 2 are respectively provided with a heating resistor 5 and a heating resistor 6 which are respectively fixed on two passage walls 7; the measuring faces of the heating resistor 5 and the heating resistor 6 are aligned with the inner faces of the passage walls 7. The measuring range of the sensor can be enlarged, and the measuring precision can be enhanced; simultaneously, the utility model has high precision when the flow is small. A movable part and a choked flow part are not arranged in the whole structure, so that the utility model can not bring any extra power loss to the measured system.
Description
Technical field:
The utility model relates to a kind of sensor that is used to measure flowing gas or fluid flow, especially a kind of thermal balance type flow sensor.
Background technology:
The thermal balance type flow sensor is exactly the upstream (equilibrium point) of measuring fluid respectively and the temperature value of downstream (test point), then, calculates the flow of liquid or gas according to the difference of 2 temperature.At present, the version of thermal balance type temperature sensor all is two kinds of hot type and hot-wires basically.Thermal flow rate sensor is that two thermal resistances are separately fixed at the inside cavity that flows through for fluid, and the measurement face of thermal resistance is general and fluid flow direction is perpendicular, but also a heating element must be set near the test point of downstream in addition; The hot-wire flow sensor then must a special pipe that is wound with hot water radiation wire, and this pipe is placed on the downstream of fluid flow direction, makes fluid this pipe of flowing through.Existing these two kinds of versions are cost height, complex structure, installation trouble not only, and the range of sensor is subjected to the qualification of distance between the set upstream and downstream thermal resistance, can only measure in less range, uses inconvenience.
Summary of the invention:
The utility model is that the existing in prior technology range is little in order to solve, complex structure, technical matters that cost is high, and the thermal balance type flow sensor of a kind of simple in structure, universalization degree height, wide range is provided.
Technical solution of the present utility model is: a kind of wide range thermal balance type flow sensor, main channel 1 is arranged, be connected to by-pass 2 with main channel 1, by-pass 2 is respectively by-pass inlet 3 and by-pass outlet 4 with the joint of main channel 1, the sectional area of by-pass 2 enters the mouth 3 to distance by-pass outlet 4 between greater than main channel 1 from the by-pass less than the sectional area and the length of main channel 1, be respectively equipped with thermal resistance 5,6 in main channel, the by-pass 2, thermal resistance 5,6 be separately fixed on two conduit walls 7 and measurement face concordant with the inner face of conduit wall 7.
All be provided with hole 8 on described two conduit walls 7, thermal resistance 5,6 is separately fixed in the hole 8.
Described two conduit walls 7 are equipped with groove 9, and thermal resistance 5,6 is fixed in the groove 9, groove 9 top 10 on wire guide 11 is arranged.
The structural design of the utility model main channel and by-pass has enlarged the range of sensor, improved measuring accuracy, and precision is higher when low discharge; Do not have movable member and choked flow part in the total, therefore, can not bring any extra power waste to system under test (SUT); Thermal resistance is measured the face structural design concordant with the conduit wall inner face, makes its thermal resistance that can adopt standard (Pt10, Pt100, Pt1000), standardization level height, highly versatile; But the thermal resistance double as heater element in the by-pass need not to establish in addition heater element, has advantages such as simple in structure, that installation is easy, cost is low, power consumption is little, is specially adapted to heat energy household metering table in the central heat supplying system.
Description of drawings:
Fig. 1 is the external structure synoptic diagram of the utility model embodiment 1,2.
Fig. 2 is the inner structure synoptic diagram of the utility model embodiment 1.
Fig. 3 is the inner structure synoptic diagram of the utility model embodiment 2.
Embodiment:
Below in conjunction with description of drawings embodiment of the present utility model.As shown in Figure 1, the utility model embodiment 1,2 has main channel 1, be connected to by-pass 2 with main channel 1, by-pass 2 is respectively by-pass inlet 3 and by-pass outlet 4 with the joint of main channel 1, and the cross section of main channel 1 and by-pass 2 can be circle, different shape such as square.The sectional area of by-pass 2 enters the mouth 3 to distance by-pass outlet 4 between greater than main channel 1 from the by-pass less than the sectional area and the length of main channel 1, be respectively equipped with thermal resistance 5,6 in main channel, the by-pass 2, thermal resistance 5,6 be separately fixed on two conduit walls 7 and measurement face concordant with the inner face of conduit wall 7.The thermal resistance mounting means of embodiment 1 is as shown in Figure 2: all be provided with hole 8 on two conduit walls 7, thermal resistance 5,6 respectively with the glue sealing, be fixed in the hole 8.The thermal resistance mounting means of embodiment 2 is as shown in Figure 2: two conduit walls 7 are equipped with groove 9, and thermal resistance 5,6 is fixed in the groove 9, groove 9 top 10 on wire guide 11 is arranged.In order to strengthen the firmness of going up thermal resistance 5,6, can be provided with support bar 12 between 10 at thermal resistance 5,6 and above the groove 9.Thermal resistance 5,6 can be standard platinum resistance Pt10, Pt100, Pt1000.
During measurement, measuring unit should be carried heating current to thermal resistance 6, receives the measuring-signal of thermal resistance 5,6 simultaneously respectively, has promptly obtained the temperature signal of equilibrium point and test point, respectively these two temperature signals are delivered to counting circuit again, then can calculate the flow velocity and the flow of detected fluid.
Claims (4)
1. wide range thermal balance type flow sensor, main channel (1) is arranged, it is characterized in that: be connected to by-pass (2) with main channel (1), by-pass (2) is respectively by-pass inlet (3) and by-pass outlet (4) with the joint of main channel (1), the sectional area of by-pass (2) less than the sectional area of main channel (1) and length greater than main channel (1) from the distance between by-pass inlet (3) to the by-pass outlet (4), main channel (1), be respectively equipped with thermal resistance (5) in the by-pass (2), (6), thermal resistance (5), (6) be separately fixed at that two conduit walls (7) are gone up and measurement face is concordant with the inner face of conduit wall (7).
2. wide range thermal balance type flow sensor according to claim 1 is characterized in that: all be provided with hole (8) on described two conduit walls (7), thermal resistance (5), (6) are separately fixed in the hole (8).
3. wide range thermal balance type flow sensor according to claim 1 is characterized in that: described two conduit walls (7) are equipped with groove (9), and thermal resistance (5), (6) are fixed in the groove (9), on top (10) of groove (9) wire guide (11) are arranged.
4. wide range thermal balance type flow sensor according to claim 3 is characterized in that: be provided with support bar (12) between top (10) of thermal resistance (5), (6) and groove (9).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02275171 CN2564996Y (en) | 2002-09-06 | 2002-09-06 | Large range heat balance type flow sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 02275171 CN2564996Y (en) | 2002-09-06 | 2002-09-06 | Large range heat balance type flow sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2564996Y true CN2564996Y (en) | 2003-08-06 |
Family
ID=33739284
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 02275171 Expired - Fee Related CN2564996Y (en) | 2002-09-06 | 2002-09-06 | Large range heat balance type flow sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2564996Y (en) |
-
2002
- 2002-09-06 CN CN 02275171 patent/CN2564996Y/en not_active Expired - Fee Related
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C19 | Lapse of patent right due to non-payment of the annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |