CN220854916U - Thermal flow velocity sensor - Google Patents
Thermal flow velocity sensor Download PDFInfo
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- CN220854916U CN220854916U CN202322701893.XU CN202322701893U CN220854916U CN 220854916 U CN220854916 U CN 220854916U CN 202322701893 U CN202322701893 U CN 202322701893U CN 220854916 U CN220854916 U CN 220854916U
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- temperature sensing
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- heating
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- 238000010438 heat treatment Methods 0.000 claims abstract description 87
- 239000012530 fluid Substances 0.000 claims abstract description 35
- 239000000758 substrate Substances 0.000 claims abstract description 19
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims abstract description 9
- 238000012545 processing Methods 0.000 claims description 14
- 238000009413 insulation Methods 0.000 claims description 9
- 239000007788 liquid Substances 0.000 claims description 5
- 239000003779 heat-resistant material Substances 0.000 claims description 4
- 229910001220 stainless steel Inorganic materials 0.000 claims description 4
- 239000010935 stainless steel Substances 0.000 claims description 4
- 238000004382 potting Methods 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 230000017525 heat dissipation Effects 0.000 abstract description 3
- 238000003491 array Methods 0.000 abstract description 2
- 230000002093 peripheral effect Effects 0.000 abstract 1
- 238000000034 method Methods 0.000 description 14
- BASFCYQUMIYNBI-UHFFFAOYSA-N platinum Chemical compound [Pt] BASFCYQUMIYNBI-UHFFFAOYSA-N 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000009434 installation Methods 0.000 description 3
- 229910052697 platinum Inorganic materials 0.000 description 3
- 239000000919 ceramic Substances 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000005672 electromagnetic field Effects 0.000 description 2
- 239000012535 impurity Substances 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000001179 sorption measurement Methods 0.000 description 2
- 238000012546 transfer Methods 0.000 description 2
- 230000004888 barrier function Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005538 encapsulation Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000010330 laser marking Methods 0.000 description 1
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- 230000000737 periodic effect Effects 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000007650 screen-printing Methods 0.000 description 1
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Abstract
The utility model provides a thermal flow velocity sensor, which comprises a substrate, wherein a plurality of positioning cavities are uniformly distributed in the substrate, the positioning cavities are divided into a heating positioning cavity and four temperature-sensing positioning cavities, and the four temperature-sensing positioning cavities are uniformly distributed at the periphery of the heating positioning cavity; the detection assembly comprises a heating element and four temperature sensing elements, wherein the heating element is positioned in the heating positioning cavity, the four temperature sensing elements are respectively positioned in the four temperature sensing positioning cavities, the heating element is positioned at the lower sides of the four temperature sensing elements, the four temperature sensing element arrays are distributed at the peripheral sides of the heating element, and the four temperature sensing elements are used for detecting the temperature change of the heating element; four temperature sensing elements and a heating element are arranged in a sensor matrix to form an integrated structure, a flowing fluid heat dissipation field is utilized to influence a temperature field in the machine body, and the flow velocity is detected through the temperature field distribution in the four temperature sensing elements, so that the purposes of low power consumption, rapidness and non-contact detection of the flow velocity are achieved.
Description
Technical Field
The utility model relates to the technical field of fluid flow rate measurement, in particular to a thermal flow rate sensor.
Background
The thermal flow rate sensor is a device for measuring the speed of fluid, and can measure parameters such as the flow rate, flow rate and temperature of various fluids, and is commonly used for detecting, controlling and regulating the flow rate of liquid or gas.
The general thermal flow rate sensor works on the principle that a heating element is used for heating fluid, a temperature sensing element is arranged at a certain distance from the heating element in the fluid flowing direction, and the temperature sensing element detects the temperature of the fluid. The temperature of the heating element and the temperature difference of the temperature sensing element are in corresponding relation with the flow rate through constant heating power, namely the flow rate is calibrated through the temperature difference; the corresponding relation between the heating power and the flow rate can be established by the temperature difference between the temperature of the constant heating element and the temperature sensing element, namely the flow rate is calibrated by the heating power.
At present, in industrial application scenes with large pipe diameter and wide range, a sensor structure manufactured by applying the principle is formed by adopting a heating element and a temperature sensing element. In order to ensure the detection accuracy, the heating element and the temperature sensing element are usually brought into direct contact with the fluid and made to be appropriately large in volume. The method has the defects that the power consumption is large, the method is not suitable for battery power supply, the use field is limited, foreign matters are easy to adsorb on the surfaces of the heating element and the temperature sensing element, the detection precision is reduced, the periodic maintenance is required, the fluid direction cannot be automatically identified, the installation requirement is high, and the like.
Disclosure of utility model
Aiming at the defects existing in the prior art, the utility model provides a thermal flow rate sensor, which aims to form an integrated structure by arranging four temperature sensing elements and a heating element in a sensor matrix, influence the temperature field in a machine body by using a flowing fluid heat dissipation field, and detect the flow rate by sensing the temperature field distribution in the machine body by the four temperature sensing elements, thereby achieving the purposes of low power consumption, rapidness and non-contact detection of the flow rate.
According to the embodiment of the utility model, the thermal flow rate sensor comprises a substrate, wherein a plurality of positioning cavities are uniformly distributed in the substrate, the positioning cavities are divided into a heating positioning cavity and four temperature-sensing positioning cavities, and the four temperature-sensing positioning cavities are uniformly distributed on the periphery of the heating positioning cavity; the detection assembly comprises a heating element and four temperature sensing elements, wherein the heating element is positioned in the heating positioning cavity, the four temperature sensing elements are respectively positioned in the four temperature sensing positioning cavities, the heating element is positioned at the lower sides of the four temperature sensing elements, the four temperature sensing element arrays are distributed at the periphery of the heating element, and the four temperature sensing elements are used for detecting the temperature change of the heating element.
Compared with the prior art, the utility model has the following beneficial effects: the flow rate of the fluid is calculated by controlling the start and stop and the power of the heating element and detecting the temperature gradient of five points of the heating element and the four temperature sensing elements, the internal heat transfer efficiency is high, the contact area between the external surface and the fluid is large, the required electric power is small, and the battery can normally work for a long time; the circuit elements are all arranged in the metal matrix, no electromagnetic field is generated on the fluid, the fluid does not contain impurity adsorption effect, and the surface of the sensor matrix is not required to be cleaned after long-time work; the four temperature sensing elements are distributed around the heating element, the fluid flowing direction can be identified through four-point temperature distribution, and the installation cost and difficulty are reduced.
Preferably, a heat insulation cavity is arranged between the heating element and the four temperature sensing elements, and the heat insulation cavity is used for insulating the heating element from the four temperature sensing elements.
Preferably, a signal processing device is arranged in the matrix, the heating element and the four temperature sensing elements are electrically connected with the signal processing device, and the signal processing device is provided with a signal lead.
Preferably, liquid heat conduction fluid is filled between the heating positioning cavity and the heating element and between the four temperature sensing positioning cavities and the four temperature sensing elements.
Preferably, a heat-resistant material is arranged in the heat-insulating cavity for insulating heat from being transferred to the temperature-sensing element through the heat-insulating cavity.
Preferably, the substrate is stainless steel.
Preferably, the surface of the base body is provided with assembly guide marks.
Preferably, the substrate seal is sealed by potting.
Drawings
Fig. 1 is a schematic perspective view of an embodiment of the present utility model.
Fig. 2 is a schematic diagram of an explosion structure according to an embodiment of the present utility model.
Fig. 3 is a radial cross-sectional view of the substrate.
FIG. 4 is a schematic view showing the internal structure of a substrate according to an embodiment of the present utility model.
In the above figures: 1. a base; 2. a heating element; 3. a temperature sensing element; 4. a heat insulating chamber; 5. assembling a guide mark; 6. a temperature-sensing positioning cavity; 7. heating the positioning cavity; 11. a signal processing device; 12. and a signal lead.
Detailed Description
The technical scheme of the utility model is further described below with reference to the accompanying drawings and examples.
As shown in fig. 1 to 4, an embodiment of the present utility model provides a thermal flow rate sensor, which includes a substrate 1, wherein a plurality of positioning cavities are uniformly distributed in the substrate, the positioning cavities are divided into a heating positioning cavity 7 and four temperature-sensing positioning cavities 6, and the four temperature-sensing positioning cavities 6 are uniformly distributed on the periphery of the heating positioning cavity 7; the detection assembly comprises a heating element 2 and four temperature sensing elements 3, wherein the heating element 2 is positioned in a heating positioning cavity 7, the four temperature sensing elements 3 are respectively positioned in four temperature sensing positioning cavities 6, the heating element 2 is positioned at the lower sides of the four temperature sensing elements 3, the four temperature sensing elements 3 are distributed at the periphery of the heating element 2 in an array manner, and the four temperature sensing elements 3 are used for detecting temperature change of the heating element 2.
The detailed working procedure of this embodiment is: the heating positioning cavity 7 and the four temperature sensing positioning cavities 6 are respectively used for installing the heating element 2 and the four temperature sensing elements 3, the four temperature sensing elements 3 are distributed on the periphery of the heating element 2 in an array manner, please refer to fig. 3, fig. 3 is a cross-sectional view of the substrate 1, the substrate 1 is cut along the radial direction of the substrate 1, the four temperature sensing elements 3 and the heating element 2 positioned at the center of the substrate 1 can be seen, the center point of each temperature sensing element 3 is connected with the center point of the heating element 2 to form four line segments, the line connecting the center point of the temperature sensing element 3 with the center point of the heating element 2 forms a 45-degree included angle with the horizontal line, and the extension line of each temperature sensing element 3 and the heating element 2 forms a 45-degree included angle for ensuring that in the adjusting process, each two adjacent sensors are connected to form two mutually parallel line segments, in the installing process, the line segments need to be parallel or perpendicular to the fluid flow, the relative position of each temperature sensing element 3 and the fluid in the installing process is ensured, so that the accurate measurement is realized, and errors are reduced.
The basic principle of the thermal flow rate sensor is that the heating element 2 is used for heating the substrate 1, and the fluid flows through the substrate 1 to take away the heat of the substrate 1, so that the gradient distribution of the temperature field is formed. The temperature sensing elements 3 and the heating elements 2 detect temperature field distribution, four temperature sensing elements 3 and one heating element 2 arranged in the sensor matrix 1 form an integrated structure, the flowing fluid heat dissipation field is utilized to influence the temperature field in the matrix 1, and the temperature field gradient distribution in the matrix is sensed by the four temperature sensing elements 3 and the heating elements 2 to calibrate the flow speed and the flow direction, so that the purpose of detecting the flow speed in a low-power-consumption, rapid and non-contact mode is achieved. All circuit elements are arranged in the metal matrix 1, no electromagnetic field is generated for fluid, the formation of magnetic fields in the matrix 1 and the outside can be avoided, the adsorption of fluid impurities is prevented, and the surface of the sensor matrix 1 does not need to be cleaned after long-time working. The four temperature sensing elements 3 are distributed around the heating element 2, and the fluid flowing direction can be identified through four-point temperature distribution, so that the installation cost and difficulty are reduced.
The heating element 2 can be a wire-wound ceramic platinum resistor or a film platinum resistor, and the temperature sensing element 3 can be a wire-wound ceramic/film/patch/PCB platinum resistor.
As shown in fig. 3 and 4, a heat insulation cavity 4 is arranged between the heating element 2 and the four temperature sensing elements 3, and the heat insulation cavity 4 is used for insulating the heating element 2 from the four temperature sensing elements 3.
The detailed working procedure of this embodiment is: because the temperature sensing element 3 and the heating element 2 are both arranged in the matrix 1, in order to avoid that the heating element 2 directly transmits heat to the temperature sensing element 3, but detects through heat conduction of the matrix 1, detection errors are avoided, a heat insulation cavity 4 is arranged between the heating element 2 and the temperature sensing element 3, heat of the heating element 2 is insulated, heat of the heating element is conducted from the matrix 1, and actual induction precision of the temperature sensing element 3 is improved.
As shown in fig. 2, a signal processing device 11 is disposed in the base 1, the heating element 2 and the four temperature sensing elements 3 are electrically connected to the signal processing device 11, and a signal lead 12 is disposed on the signal processing device 11.
The detailed working procedure of this embodiment is: the signal processing device 11 is used to convert the signals of the four temperature sensing elements 3 and output the converted signals through the signal lead 12, and in other embodiments, the temperature sensing elements 3 may be directly led out of the casing through the signal lead 12 for connection without conversion by the signal processing device 11.
The signal processing means 11 are common elements and are not described in detail here.
As shown in fig. 4, the liquid heat conduction fluid is filled between the heating positioning cavity 7 and the heating element 2 and between the four temperature sensing positioning cavities 6 and the four temperature sensing elements 3.
The detailed working procedure of this embodiment is: the liquid heat conduction fluid is used for filling the gaps between the elements and the containing cavity, so that the sensing precision is improved, and the detection error is reduced.
As shown in fig. 4, a heat-resistant material is disposed in the heat-insulating chamber 4, for insulating heat from being transferred to the temperature-sensing element 3 through the heat-insulating chamber 4.
The detailed working procedure of this embodiment is: the heat-resistant material has the functions of improving the heat transfer barrier of the pair of heating elements 2, ensuring the conduction of the temperature detected by the temperature-sensitive elements 3 from the base body 1 and improving the detection accuracy of the four temperature-sensitive elements 3.
As shown in fig. 2, the base 1 is made of stainless steel.
The detailed working procedure of this embodiment is: the stainless steel can effectively prevent the matrix 1 from being in the fluid for a long time and being corroded by the fluid.
As shown in fig. 1, the surface of the base body 1 is provided with an assembly guide 5.
The detailed working procedure of this embodiment is: the base body 1 is a closed and opaque object, and in order to accurately mount the relative position of the sensor and the fluid, the surface of the base body 1 is provided with an assembly guide mark 5, which has the function of forming an effective reference in the adjusting process and guaranteeing the mounting position of the base body, and the assembly guide mark 5 can be reserved in the modes of slotting, laser marking, silk screen printing and the like.
As shown in fig. 4, the sealing of the base 1 is performed by potting.
The detailed working procedure of this embodiment is: the encapsulation mode is used for sealing to achieve the IPX8 protection level, so that the application range is improved.
The implementation principle of the embodiment of the application is as follows: firstly, the base body 1 with the installed and sealed structure is placed in fluid, when the flow rate of the fluid is detected, the temperature sensing element 3 is used for detecting the change of the fluid and the heating element 2 (when the fluid speed is increased, the carrying effect of the fluid on a heat source is enhanced, and the temperature change of a measuring sensor is reduced, otherwise, when the fluid speed is reduced, the temperature change of the measuring sensor is increased), and a change signal of the temperature sensing element 3 is processed by the signal processing device 11, and when the change signal is output by the signal lead 12, the temperature through the heating element 2 and the temperature difference of the temperature sensing element 3 are in corresponding relation with the flow rate, namely, the flow rate is calibrated through the temperature difference.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (8)
1. A thermal flow rate sensor, comprising:
a plurality of positioning cavities are uniformly distributed in the matrix (1), each positioning cavity is divided into a heating positioning cavity (7) and four temperature-sensing positioning cavities (6), and the four temperature-sensing positioning cavities (6) are uniformly distributed at the periphery of the heating positioning cavity (7);
The detection assembly comprises a heating element (2) and four temperature sensing elements (3), wherein the heating element (2) is positioned in a heating positioning cavity (7), the four temperature sensing elements (3) are respectively positioned in four temperature sensing positioning cavities (6), the heating element (2) is positioned at the lower sides of the four temperature sensing elements (3), the four temperature sensing elements (3) are distributed at the periphery of the heating element (2), and the four temperature sensing elements (3) are used for detecting temperature change of the heating element (2).
2. A thermal flow sensor according to claim 1, characterized in that: a heat insulation cavity (4) is arranged between the heating element (2) and the four temperature sensing elements (3), and the heat insulation cavity (4) is used for insulating the heating element (2) and the four temperature sensing elements (3).
3. A thermal flow sensor according to claim 1, characterized in that: the temperature sensing device is characterized in that a signal processing device (11) is arranged in the base body (1), the heating element (2) and the four temperature sensing elements (3) are electrically connected with the signal processing device (11), and a signal lead (12) is arranged on the signal processing device (11).
4. A thermal flow sensor according to claim 1, characterized in that: liquid heat conduction fluid is filled between the heating positioning cavity (7) and the heating element (2) and between the four temperature sensing positioning cavities (6) and the four temperature sensing elements (3).
5. A thermal flow sensor according to claim 2, characterized in that: the heat insulation cavity (4) is internally provided with a heat-resistant material for insulating heat from being transferred to the temperature sensing element (3) through the heat insulation cavity (4).
6. A thermal flow sensor according to claim 1, characterized in that: the substrate (1) is made of stainless steel.
7. A thermal flow sensor according to claim 6, wherein: the surface of the base body (1) is provided with an assembly guide mark (5).
8. A thermal flow sensor according to claim 6, wherein: the sealing of the substrate (1) is sealed in a potting mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322701893.XU CN220854916U (en) | 2023-10-09 | 2023-10-09 | Thermal flow velocity sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322701893.XU CN220854916U (en) | 2023-10-09 | 2023-10-09 | Thermal flow velocity sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220854916U true CN220854916U (en) | 2024-04-26 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322701893.XU Active CN220854916U (en) | 2023-10-09 | 2023-10-09 | Thermal flow velocity sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220854916U (en) |
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2023
- 2023-10-09 CN CN202322701893.XU patent/CN220854916U/en active Active
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