CN106383248B - Speed measuring device based on thermistor - Google Patents
Speed measuring device based on thermistor Download PDFInfo
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- CN106383248B CN106383248B CN201610970888.0A CN201610970888A CN106383248B CN 106383248 B CN106383248 B CN 106383248B CN 201610970888 A CN201610970888 A CN 201610970888A CN 106383248 B CN106383248 B CN 106383248B
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- 238000001514 detection method Methods 0.000 claims abstract description 26
- 238000012360 testing method Methods 0.000 claims abstract description 23
- 230000001681 protective effect Effects 0.000 claims description 11
- 239000012530 fluid Substances 0.000 abstract description 12
- 238000010586 diagram Methods 0.000 description 3
- 238000013461 design Methods 0.000 description 2
- 230000020169 heat generation Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01P—MEASURING LINEAR OR ANGULAR SPEED, ACCELERATION, DECELERATION, OR SHOCK; INDICATING PRESENCE, ABSENCE, OR DIRECTION, OF MOVEMENT
- G01P5/00—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft
- G01P5/10—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables
- G01P5/12—Measuring speed of fluids, e.g. of air stream; Measuring speed of bodies relative to fluids, e.g. of ship, of aircraft by measuring thermal variables using variation of resistance of a heated conductor
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- Measuring Volume Flow (AREA)
Abstract
The invention discloses a speed measuring device based on a thermistor, which comprises: the device comprises a shell, a first thermistor, a second thermistor, a voltage detection module and a control module. The housing is provided with a channel, an inlet and an outlet. The channel is communicated with the external environment through an inlet and an outlet. The first thermistor and the second thermistor are connected in series in the constant voltage source circuit, and the first thermistor and the second thermistor are sequentially arranged in the channel. The voltage detection module is used for acquiring voltage information between a first test point between the first thermistor and the second thermistor and a second test point in the constant voltage source circuit. The control module is connected with the voltage detection module and is used for obtaining flow rate information according to the voltage information and a preset rule. The speed measuring device based on the thermistor is only provided with the first thermistor, the second thermistor, the voltage detection module and the control module, so that the fluid flow speed can be measured, the structure is simple, the cost is low, and the product is conveniently designed into a small structure.
Description
Technical Field
The invention relates to a speed measuring device, in particular to a speed measuring device based on a thermistor.
Background
The traditional wind speed measuring and sensing device mainly comprises the following two types: one is a wind cup wind speed sensing device with a rotating component and a propeller wind speed sensing device, and the other is a hot wire wind speed sensing device. The wind cup wind speed sensor and the propeller wind speed sensor measure wind speed through the rotating mode of the fan blades, the inertia of the sensor is large, the measuring error is large, and the structural volume is large. The hot wire wind speed sensing device has smaller volume, but the circuit is more complex, the manufacturing process difficulty is higher, and the cost is higher.
Disclosure of Invention
Based on the above, the invention aims to overcome the defects of the prior art and provide the thermistor-based speed measuring device with simple structure and low cost.
The technical scheme is as follows: a thermistor-based speed measuring device comprising: the shell is provided with a channel, an inlet and an outlet, and the channel is communicated with the external environment through the inlet and the outlet; the first thermistor and the second thermistor are connected in series in the constant voltage source circuit, and the first thermistor and the second thermistor are sequentially arranged in the channel; the voltage detection module is used for acquiring voltage information between a first test point between the first thermistor and the second thermistor and a second test point in the constant voltage source circuit; and the control module is connected with the voltage detection module and is used for obtaining flow rate information according to a preset rule according to the voltage information.
In one embodiment, one end of the first thermistor is connected to a constant voltage source, the other end of the first thermistor is connected with one end of the second thermistor, and the other end of the second thermistor is grounded.
In one embodiment, the thermistor-based speed measuring device further comprises a potentiometer, the first thermistor is connected in series with the second thermistor and then connected in parallel with two fixed lead terminals of the potentiometer, and the second test point is located on a movable lead terminal of the potentiometer.
In one embodiment, the thermistor-based speed measuring device further comprises a fourth resistor and a fifth resistor which are connected in series, wherein a branch formed by connecting the fourth resistor and the fifth resistor in series is connected in parallel with a branch formed by connecting the first thermistor and the second thermistor in series; the second test point is positioned between the fourth resistor and the fifth resistor.
In one embodiment, the thermistor-based speed measuring device further comprises a circuit control board, an opening area is formed in the top of the shell, a control circuit board is arranged on the cover of the opening area, and the circuit control board is matched with the bottom of the shell and the side wall of the shell to form the channel.
In one embodiment, the inlet and the outlet are arranged on the side wall of the shell, and the inlet is opposite to the outlet.
In one embodiment, the voltage detection module and the control module are both disposed in the circuit control board.
In one embodiment, a protective cover is connected to the outside of the shell, and the protective cover is covered on the circuit control board.
In one embodiment, the speed measuring device based on the thermistor further comprises a prompt module, wherein the prompt module is connected with the control module and is used for prompting the current flow rate information.
In one embodiment, the speed measuring device based on the thermistor further comprises a warning module, the warning module is connected with the control module, the control module is further used for judging whether the current flow speed is in a preset range according to the flow speed information and sending a signal that the current flow speed is not in the preset range to the warning module, and the warning module is used for carrying out warning operation according to the signal that the current flow speed is not in the preset range.
The advantages and principles of the foregoing technical solutions are described below:
1. the above-mentioned speed measuring device based on thermistor only is provided with first thermistor, second thermistor, voltage detection module and control module and can test and obtain the fluid velocity of flow, for traditional speed measuring device, this embodiment based on thermistor's speed measuring device structure is comparatively simple, and the cost is cheaper, and can conveniently design into small-size structure with the product.
2. The thermistor-based speed measuring device comprises a potentiometer. The first thermistor is connected in series with the second thermistor and then connected in parallel with two fixed lead ends of the potentiometer, and the second test point is positioned at the movable lead end of the potentiometer. After the first thermistor and the second thermistor are connected in series in the constant voltage source circuit, the first thermistor and the second thermistor can be prevented from changing due to heat generation. After the bridge resistance is adjusted through the movable lead end of the potentiometer, the voltage value between the first test point and the second test point detected by the voltage detection module can be zero. Therefore, when the thermistor-based speed measuring device is used for testing the fluid speed, the voltage in the voltage detection module changes from zero, and each voltage value in the voltage detection module corresponds to the fluid speed with different magnitudes.
3. An opening area is arranged in the shell. The opening area of the shell is covered with a control circuit board. The first thermistor, the second thermistor, the voltage detection module and the control module are all arranged on the circuit control board. The control circuit board, the bottom of the shell and the side wall of the shell are matched to form a channel, so that the volume of the speed measuring device based on the thermistor is minimized as much as possible.
4. The shell is externally connected with a protective cover. The protective cover is arranged on the control circuit board. The protective cover can prevent the control circuit board from being damaged by friction, breaking and the like, and can protect the control circuit board.
5. The speed measuring device based on the thermistor comprises a prompt module. The prompt module is connected with the control module and is used for prompting the current flow rate information. The prompting module can carry out voice prompting operation through the voice module or display operation through the display module, so that the user can be informed of the current tested flow rate information in time.
6. The speed measuring device based on the thermistor comprises a warning module. The warning module is connected with the control module. The control module is used for judging whether the current flow rate is within a preset range according to the flow rate information and sending a signal that the current flow rate is not within the preset range to the warning module; the warning module is used for carrying out warning operation according to signals that the current flow speed is not in a preset range. The alarm module can be in alarm modes such as indicator lamp alarm, vibration alarm, voice alarm and the like. When the control module judges that the flow velocity in the channel is not in the preset range, the alarm module is used for carrying out alarm operation, so that the flow velocity information which is not in the preset range can be timely informed to a user in an alarm mode, and the user can timely carry out corresponding processing.
Drawings
FIG. 1 is a schematic diagram of a thermistor-based speed measuring device according to an embodiment of the present invention;
FIG. 2 shows a constant voltage source circuit in a thermistor-based speed measuring device according to an embodiment of the present invention;
FIG. 3 is a schematic diagram showing a constant voltage source circuit in a thermistor-based speed measuring device according to a second embodiment of the present invention;
fig. 4 is a schematic diagram showing a constant voltage source circuit in a thermistor-based speed measuring device according to a third embodiment of the present invention.
Reference numerals illustrate:
10. the device comprises a shell, 11, a channel, 12, an inlet, 13, an outlet, 14, an opening area, 20, a first thermistor, 30, a second thermistor, 40, a voltage detection module, 50, a constant voltage source circuit, 51, a first test point, 52, a second test point, 53, a constant voltage source, 60, a potentiometer, 61, a movable lead end, 71, a fourth resistor, 72, a fifth resistor, 80, a circuit control board, 90 and a protective cover.
Detailed Description
The following describes embodiments of the present invention in detail:
as shown in fig. 1, a thermistor-based speed measuring device according to an embodiment of the present invention includes: the device comprises a housing 10, a first thermistor 20, a second thermistor 30, a voltage detection module 40 and a control module.
The housing 10 is provided with a channel 11, an inlet 12 and an outlet 13. The channel 11 communicates with the environment through the inlet 12 and the outlet 13. The first thermistor 20 and the second thermistor 30 are connected in series in a constant voltage power supply circuit 50 (as shown in fig. 2 to 4), and the first thermistor 20 and the second thermistor 30 are sequentially disposed in the channel 11. The voltage detection module 40 is configured to obtain voltage information between a first test point 51 between the first thermistor 20 and the second thermistor 30 and a second test point 52 in the constant voltage source circuit 50. When the fluid enters the housing 10 from the inlet 12 of the housing 10 and passes through the channel 11, the fluid contacts the first thermistor 20 and takes away the heat on the first thermistor 20, so that the first thermistor 20 and the second thermistor 30 perform heat dissipation and temperature reduction, and the temperature of the first thermistor 20 is lower than that of the second thermistor 30, so that the resistance of the first thermistor 20 is larger than the resistance of the second thermistor 30, and the voltage information detected by the voltage detection module 40 is changed. The magnitude of the difference in resistance between the first thermistor 20 and the second thermistor 30 depends on the magnitude of the fluid flow rates, and each flow rate of the fluid corresponds to one voltage information.
The control module is connected to the voltage detection module 40, and the control module is configured to obtain flow rate information according to a preset rule according to the voltage information. In this embodiment, the preset rule may be set by recording the voltage information measured at different flow rates according to a plurality of groups of simulation experiments, and summarizing the relationship between the voltage information and the flow rate.
The above-mentioned speed measuring device based on thermistor only is provided with first thermistor 20, second thermistor 30, voltage detection module 40 and control module and can test and obtain the fluid velocity of flow, for traditional speed measuring device, this embodiment speed measuring device based on thermistor's structure is comparatively simple, and the cost is cheaper, and can conveniently design the product into small-size structure.
Referring to any one of fig. 2 to 4, one end of the first thermistor 20 is connected to a constant voltage source 53, and the other end of the first thermistor 20 is connected to one end of the second thermistor 30. The other end of the second thermistor 30 is grounded. The first thermistor 20 and the second thermistor 30 are both positive temperature coefficient thermistors. When the first thermistor 20 and the second thermistor 30 work, no additional current stabilizing circuit is needed, so that the control is convenient, and the cost is low.
Referring to fig. 3, the thermistor-based speed measuring device further includes a potentiometer 60. The first thermistor 20 is connected in series with the second thermistor 30 and then connected in parallel with two fixed lead terminals of the potentiometer 60, and the second test point 52 is located at a movable lead terminal 61 of the potentiometer 60. When the first thermistor 20 and the second thermistor 30 are connected in series to the constant voltage power supply circuit 50, the first thermistor 20 and the second thermistor 30 are prevented from changing due to heat generation. After the bridge resistance is adjusted by the movable lead 61 of the potentiometer 60, the voltage value between the first test point 51 and the second test point 52 detected by the voltage detection module 40 can be zero. Thus, when the thermistor-based speed measuring device is used for measuring fluid velocity, the voltage in the voltage detection module 40 changes from zero, and each voltage value in the voltage detection module 40 corresponds to fluid velocity with different magnitudes.
Referring to fig. 4, the thermistor-based speed measuring device further includes a fourth resistor 71 and a fifth resistor 72 connected in series. A branch formed by connecting the fourth resistor 71 and the fifth resistor 72 in series is connected in parallel with a branch formed by connecting the first thermistor 20 and the second thermistor 30 in series. The second test point 52 is located between the fourth resistor 71 and the fifth resistor 72.
Referring to fig. 1 again, the thermistor-based speed measuring device further includes a circuit control board 80. The first thermistor 20, the second thermistor 30, the voltage detection module 40 and the control module are all mounted on the circuit control board 80. The top of the housing 10 has an open area 14. The opening area 14 is covered with a control circuit board. The circuit control board 80 is matched with the bottom of the shell 10 and the side wall of the shell 10 to form the channel 11. This allows the volume of the thermistor-based tachometer to be minimized as much as possible.
The inlet 12 and the outlet 13 are arranged on the side wall of the shell 10, and the inlet 12 is opposite to the outlet 13. Thus, the channel 11 in the housing 10 may be provided as a direct flow channel 11, so that fluid passes through the channel 11.
The voltage detection module 40 and the control module are both disposed in the circuit control board 80. The potentiometer 60 may be disposed in the circuit control board 80. The fourth resistor 71 and the fifth resistor 72 may be provided in the circuit control board 80. This allows the volume of the thermistor-based tachometer to be minimized as much as possible.
The housing 10 is externally connected with a protective cover 90, and the protective cover 90 is covered on the circuit control board 80. The protective cover 90 can prevent the control circuit board from being damaged by friction, breaking, etc., and can protect the control circuit board.
The speed measuring device based on the thermistor also comprises a prompt module. The prompt module is connected with the control module and is used for prompting the current flow rate information. The prompting module can carry out voice prompting operation through the voice module or display operation through the display module, so that the user can be informed of the current tested flow rate information in time.
The speed measuring device based on the thermistor also comprises a warning module. The warning module is connected with the control module. The control module is also used for judging whether the current flow rate is within a preset range according to the flow rate information and sending a signal that the current flow rate is not within the preset range to the warning module; the warning module is used for carrying out warning operation according to signals that the current flow speed is not in a preset range. The alarm module can be in alarm modes such as indicator lamp alarm, vibration alarm, voice alarm and the like. When the control module judges that the flow velocity in the channel 11 is not in the preset range, the alarm module is used for carrying out alarm operation, so that the flow velocity information which is not in the preset range can be timely informed to a user in an alarm mode, and the user can timely carry out corresponding treatment.
The above examples illustrate only a few embodiments of the invention, which are described in detail and are not to be construed as limiting the scope of the invention. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the invention, which are all within the scope of the invention. Accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (10)
1. Speed measuring device based on thermistor, its characterized in that includes:
the shell is provided with a channel, an inlet and an outlet, and the channel is communicated with the external environment through the inlet and the outlet;
the first thermistor and the second thermistor are connected in series in the constant voltage source circuit, and the first thermistor and the second thermistor are sequentially arranged in the channel along the flow direction;
the voltage detection module is used for acquiring voltage information between a first test point between the first thermistor and the second thermistor and a second test point in the constant voltage source circuit;
the control module is connected with the voltage detection module and is used for obtaining flow rate information according to a preset rule according to the voltage information; and
And the first thermistor is connected with the second thermistor in series and then connected with two fixed lead terminals of the potentiometer in parallel, and the second test point is positioned at the movable lead terminal of the potentiometer.
2. The thermistor-based speed measuring device according to claim 1, wherein one end of the first thermistor is connected to a constant voltage source, the other end of the first thermistor is connected with one end of the second thermistor, and the other end of the second thermistor is grounded.
3. The thermistor-based speed measuring device according to claim 1 or 2, further comprising a circuit control board, wherein the top of the housing is provided with an opening area, the opening area is covered with a control circuit board, and the circuit control board is matched with the bottom of the housing and the side wall of the housing to form the channel.
4. A thermistor-based speed measuring device as defined in claim 3, wherein the inlet is provided in the side wall of the housing.
5. The thermistor-based speed measuring device of claim 4, wherein the outlet is provided in the housing sidewall.
6. The thermistor-based speed measuring device of claim 5, wherein the inlet is disposed opposite the outlet.
7. A thermistor-based speed measuring device as defined in claim 3, wherein the voltage detection module and the control module are both disposed in the circuit control board.
8. A thermistor-based speed measuring device according to claim 3, wherein a protective cover is connected to the outside of the housing, and the protective cover is covered on the circuit control board.
9. The thermistor-based speed measuring device of claim 1, further comprising a prompt module connected to the control module, the prompt module being configured to prompt current flow rate information.
10. The thermistor-based speed measuring device according to claim 1 or 9, further comprising a warning module, wherein the warning module is connected to the control module, the control module is further configured to determine whether the current flow rate is within a preset range according to the flow rate information, and send a signal that the current flow rate is not within the preset range to the warning module, and the warning module is configured to perform a warning operation according to the signal that the current flow rate is not within the preset range.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610970888.0A CN106383248B (en) | 2016-10-27 | 2016-10-27 | Speed measuring device based on thermistor |
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| CN201610970888.0A CN106383248B (en) | 2016-10-27 | 2016-10-27 | Speed measuring device based on thermistor |
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| CN106383248A CN106383248A (en) | 2017-02-08 |
| CN106383248B true CN106383248B (en) | 2023-06-16 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107741507A (en) * | 2017-12-12 | 2018-02-27 | 湖南普信工程技术有限公司 | A kind of NTC airspeedometers |
| CN115942213A (en) * | 2021-08-20 | 2023-04-07 | 华为技术有限公司 | Fluid detection device, control method and electronic equipment |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN206114695U (en) * | 2016-10-27 | 2017-04-19 | 广东奥迪威传感科技股份有限公司 | Speed sensor based on thermistor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0835978A (en) * | 1994-07-20 | 1996-02-06 | Murata Mfg Co Ltd | Wind speed sensor |
| CA2389151A1 (en) * | 1999-10-29 | 2001-05-03 | Mitsui Mining & Smelting Co., Ltd. | Flowmeter |
| US7333899B2 (en) * | 2004-10-13 | 2008-02-19 | Therm-O-Disc, Incorporated | Fluid flow rate sensor and method of operation |
| US7685875B2 (en) * | 2007-10-23 | 2010-03-30 | Therm-O-Disc, Incorporated | Fluid flow rate sensor and method of operation |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN206114695U (en) * | 2016-10-27 | 2017-04-19 | 广东奥迪威传感科技股份有限公司 | Speed sensor based on thermistor |
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