CN100520312C - Flow quantity temperature detector - Google Patents
Flow quantity temperature detector Download PDFInfo
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- CN100520312C CN100520312C CNB2007100261251A CN200710026125A CN100520312C CN 100520312 C CN100520312 C CN 100520312C CN B2007100261251 A CNB2007100261251 A CN B2007100261251A CN 200710026125 A CN200710026125 A CN 200710026125A CN 100520312 C CN100520312 C CN 100520312C
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Abstract
The invention relates to a flow and temperature detector, an electrical part of which comprises a temperature sensor, a flow sensor, a single chip machine, a temperature display unit (9) and a flow display unit (8), wherein the temperature sensor, the flow sensor, the temperature display unit (9) and the flow display unit (8) are connected with the single chip machine, the temperature and flow signals of the temperature sensor and the flow sensor are transmitted to the single chip machine, and the data after processed is respectively displayed through the temperature display unit (9) and the flow display unit (8). The invention integrates a flow tester and a temperature tester, and simultaneously has all functions of the temperature sensor and the flow sensor. The flow test result is accurate, and the environmental temperature has the small impact on the invention.
Description
Technical field
The present invention relates to a kind of fluid detection instrument, especially a kind of flow quantity temperature detector.
Background technology
In the prior art, be two independent products for the flow of fluid and the detection of temperature.Their principle of work is: flow sensor is used for flux monitoring system, when flow velocity reaches the flow velocity threshold values of setting, produces detection signal, is used to protect the interlock protection system.What flow sensor was commonly used is mechanical type, and its principle of work is traditional differential pressure type, float-type etc., and their mechanism is complicated heavy, and difficulty (must block piping erection) is installed, and crushing is big, low precision, and gas, liquid can not be general.Temperature sensor is used for displays temperature and produces control signal, and charactron is used for display button and sets menu state.
More than two kinds of equipment be the most frequently used in the automated system, can use this two classes sensor in the most systems simultaneously.As two separate equipment inconvenience that will inevitably bring operation, safeguard and install to the user respectively, bring system wiring complexity and integrity problem simultaneously.Commonly used flow sensor or temperature sensor, its outward appearance use all generally that structure, its profile of right cylinder or approximate rectangular parallelepiped is plain, to lack variation, moulding attractive in appearance etc. always.
Summary of the invention
Install in order to solve in the prior art, the problem of the inconvenience of operation, maintenance, wiring, the present invention unites two into one flow tester and temperature measuring device, possesses all functions of temperature and flow sensor simultaneously.Concrete technical scheme is:
A kind of flow quantity temperature detector, form by structure division and electric part, electric part is installed in the structure division, electric part comprises temperature sensor, flow sensor, single-chip microcomputer, temperature display unit, flow display unit, it is characterized in that temperature sensor, flow sensor, temperature display unit, flow display unit connect single-chip microcomputer, temperature, the flow signal of temperature sensor and flow sensor are transferred to single-chip microcomputer, and data show by temperature display unit and flow display unit respectively after treatment.
Flow sensor comprises flow velocity inductive reactance and temperature sense resistance, and they are connected with single-chip microcomputer respectively, and the flow velocity inductive reactance is used to respond to water flow velocity, and temperature sense resistance is used to respond to water temperature and produces reference voltage.As improvement, flow velocity inductive reactance and temperature sense resistance are connected to two input ends of a differential amplifier circuit in turn, and the output terminal of differential amplifier circuit connects single-chip microcomputer by filtering circuit.Also have a reference potential generator, be used to offer temperature sense resistance reference voltage, one input end connects single-chip microcomputer, and another input end connects the voltage range learning device.The voltage range learning device is connected in single-chip microcomputer, is used for manually being provided with the flow rate test scope.Described filtering circuit is a bandpass filter, and differential amplifier circuit is a differential amplifier.Temperature sensor is provided with filtering circuit, and this circuit is connected between temperature sensor and the single-chip microcomputer.This filtering circuit is a bandpass filter.
Temperature display unit adopts three 7 sections charactron temperature to show; The flow display unit shows with 10 LED flows.
Structure division comprises main body and probe, and being connected with main part of probe one end, temperature sensor and flow sensor are installed in the other end of probe, fills heat conductor around the temperature sensor; Single-chip microcomputer, temperature display unit, flow display unit are installed in the main body.Main body is spherical, and temperature display unit, flow display unit are located on the spherical tangent plane; Described probe diameter is not more than 10mm.
Compared with prior art, the invention has the beneficial effects as follows:
1, flow tester and temperature measuring device are united two into one, possess all functions of temperature and flow sensor simultaneously.
2, the flow rate test result is accurate, and is influenced by ambient temperature little.
3, the user can be provided with flow measurement range.
4, probe is installed in the pipeline of a little caliber, and the complicated purity of measurement is reduced, and need not block tested pipeline.
5, main body adopts the spherical shell structure, and is elegant in appearance.
Description of drawings
Fig. 1 is a principle of the invention block diagram
Fig. 2 is an outward appearance front elevation of the present invention, and Fig. 3 is an exterior sideview cut-open view of the present invention
Among the figure: flow velocity inductive reactance 1, heater 2, temperature sense resistance 3, air chamber semiconductor 4, digital temperature IC5, main body 6, probe 7, flow display unit 8, temperature display unit 9
Embodiment
The invention will be further described below in conjunction with accompanying drawing and embodiment.
A kind of flow quantity temperature detector is made up of structure division and electric part, and electric part is installed in the structure division.Electric part comprises temperature sensor, flow sensor, single-chip microcomputer, temperature display unit 9, flow display unit 8.Temperature sensor, flow sensor, temperature display unit 9, flow display unit 8 connect PIC single-chip microcomputer P89LPC512.Temperature, the flow signal of temperature sensor and flow sensor are transferred to single-chip microcomputer, and data show by temperature display unit 9 and flow display unit 8 respectively after single-chip microcomputer is handled.
As Fig. 2,3, structure division of the present invention comprises main body 6 and probe 7, and being connected with main body 6 of probe 7 one ends, temperature sensor and flow sensor are installed in the other end of probe 7.Single-chip microcomputer, temperature display unit 9, flow display unit 8 are installed in main body interior 6.Described probe 7 diameter 8m.
The test mode of flow is to utilize the thermal diffusion principle and produce.Theoretical formula: V ∝ Ksqrt (T); T ∝ R
TWherein V one rate of flow of fluid, T-temperature, R
T-thermistor causes resistance by temperature.By this formula as can be known, temperature sense resistance and flow velocity are square proportional relations, utilize this principle, two resistance (temperature sense) are arranged,, change by benchmark inductive reactance and fluctuations in discharge resistive voltage with the constant voltage source power supply, handle through amplification filtering, detect flow signal.
Concrete enforcement is: flow sensor comprises that flow velocity inductive reactance 1, temperature sense resistance 3 (are used to respond to water temperature, produce reference voltage), temperature sense resistance 3 is by the power supply of reference potential generator, and resistance 1,3 connects two input ends of differential amplifier (using existing device) respectively, the signal of differential amplifier output is connected with single-chip microcomputer after bandpass filter (being made up of with low-pass filter circuit existing high-pass filtering circuit) filtering.Single-chip microcomputer P89LPC512 can produce reference potential, and the input end with function of reference potential generator is connected in single-chip microcomputer.The height of Single-chip Controlling reference potential reaches the voltage range function of learning, has the effect of voltage range learning device.The user can be provided with the voltage output range of reference potential device by single-chip microcomputer, and then obtains the scope of flow rate test.
Also being provided with heater 2 and air chamber semiconductor 4 is in order to keep thermal equilibrium, be obtaining the wideer range of linearity.
Existing digital temperature sensor LM37 and high thermal conductivity coefficient heat conductive silica gel are adopted in temperature survey, and they can improve the susceptibility and the precision of thermometric.The digital temperature IC5 of sensor is located at the top of flow sensor, is full of the high thermal conductivity coefficient heat conductive silica gel on every side, and isolates by air chamber semiconductor 4 with flow sensor.
LM37 is I
2The digital circuit of C serial mode, there is ROM its inside, reads the ROM value by single-chip microcomputer, can calculate temperature value.This temperature sensor is provided with bandpass filter.
Temperature display unit 9 adopts three 7 sections charactron temperature to show.Flow display unit 8 adopts 10 LED flows to show, word order is from left to right represented the size of flow with the luminous number of LED.
Single-chip microcomputer is corresponding flow and temperature generation two-way pilot signal respectively, and the multiple way of output is arranged, and is divided into by output type: 1. switching value output, NPN, PNP, relay output, 2. the analog quantity way of output: 4～20mA, 0～10V.Be divided into two-wire system and three-wire system output by the way of output.
Using method: in the time of actual the use, only need on tested pipeline, open the aperture of a diameter 8mm, probe of the present invention be stretched into get final product (if measured object not through pipeline transmission, only need stretch in the testee just passable) to probe.The user can be provided with the height of flow rate test by tested flow range is set.
It is as shown in the table, is display menu of the present invention.Wherein first classify setup menu as, second classifies the menu function note as, and the 3rd classifies parameter as is provided with scope, and the 4th classifies the note of the scope of setting as, remarks explanation menu object.Form last column is the setting of distance learning line, and its is only at learning functionality of flow, with " the high some study " in the menu " low spot study " function is identical, and purpose is to set flow range.This function setting is to make things convenient for the user, execute-in-place, and the user only needs white line in the output line and positive source short circuit can be operated.
Its method to set up, referring to Fig. 2, two buttons are arranged at the panel bottom, and left side MODE/ENTER key is menu setting and confirms function, whenever is presented on the charactron by a menu sequence.The right LEARN/SET key is a parameter setting, with cooperating the MODE/ENTER key, respective menu is carried out parameter setting (showing equally) on charactron, and parameter confirms to press once more the MODE/ENTER key.Table
Claims (4)
1, a kind of flow quantity temperature detector, its electric part comprises temperature sensor, flow sensor, single-chip microcomputer, temperature display unit (9), flow display unit (8), it is characterized in that temperature sensor, flow sensor, temperature display unit (9), flow display unit (8) connect single-chip microcomputer, the temperature and the flow signal of temperature sensor and flow sensor are transferred to single-chip microcomputer, and data show by temperature display unit (9) and flow display unit (8) respectively after treatment; Flow sensor comprises flow velocity inductive reactance (1) and temperature sense resistance (3), and they are connected with single-chip microcomputer respectively, and flow velocity inductive reactance (1) is used to respond to water flow velocity, and temperature sense resistance (3) is used to respond to water temperature; Flow velocity inductive reactance (1) and temperature sense resistance (3) are connected two input ends of differential amplifier circuit, and the output terminal of differential amplifier circuit connects single-chip microcomputer by filtering circuit; Be provided with the reference potential generator, its input end connects single-chip microcomputer, and output terminal connects temperature sense resistance (3), is used to offer temperature sense resistance (3) reference voltage.
2, flow quantity temperature detector according to claim 1 is characterized in that being provided with filtering circuit, and filtering circuit is connected between temperature sensor and the single-chip microcomputer.
3, flow quantity temperature detector according to claim 1, it is characterized in that described detector also comprises the structure division of being made up of main body (6) and probe (7), one end of probe (7) is connected with main body (6), temperature sensor and flow sensor are installed in the other end of probe (7), fill heat conductor around the temperature sensor; Single-chip microcomputer, temperature display unit (9), flow display unit (8) are installed in the main body (6).
4, flow quantity temperature detector according to claim 3 is characterized in that described main body (6) for spherical, and temperature display unit (9), flow display unit (8) are located on the spherical tangent plane; Described probe (7) diameter is not more than 10mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100261251A CN100520312C (en) | 2007-08-15 | 2007-08-15 | Flow quantity temperature detector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2007100261251A CN100520312C (en) | 2007-08-15 | 2007-08-15 | Flow quantity temperature detector |
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| Publication Number | Publication Date |
|---|---|
| CN101140178A CN101140178A (en) | 2008-03-12 |
| CN100520312C true CN100520312C (en) | 2009-07-29 |
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| Application Number | Title | Priority Date | Filing Date |
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| CNB2007100261251A Active CN100520312C (en) | 2007-08-15 | 2007-08-15 | Flow quantity temperature detector |
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Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106289382A (en) * | 2015-06-08 | 2017-01-04 | 伊玛精密电子（苏州）有限公司 | Antiacid alkali all-metal flow temperature sensor |
| CN107664553A (en) * | 2017-10-25 | 2018-02-06 | 伊玛精密电子（苏州）有限公司 | A kind of pressure and temp process circuit, the especially pressure thermometer with it |
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2007
- 2007-08-15 CN CNB2007100261251A patent/CN100520312C/en active Active
Non-Patent Citations (8)
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| CCT型硅集成流量、温度和真空度多功能传感器. 童勤义，黄金彪.仪表技术与传感器，第3期. 1991 |
| CCT型硅集成流量、温度和真空度多功能传感器. 童勤义，黄金彪.仪表技术与传感器，第3期. 1991 * |
| PCF80C552在多功能流量、压力温度计量仪上的应用. 陈文贤，周延周，王金章.黑龙江自动化技术与应用，第13卷第1期. 1994 |
| PCF80C552在多功能流量、压力温度计量仪上的应用. 陈文贤，周延周，王金章.黑龙江自动化技术与应用，第13卷第1期. 1994 * |
| 智能流量温度测控仪. 高永华，王文新，贾少光.仪表技术，第1期. 1996 |
| 智能流量温度测控仪. 高永华，王文新，贾少光.仪表技术，第1期. 1996 * |
| 温度流量复合传感器. 朱玉江，刘炎，张德利，王香文.传感器技术，第19卷第1期. 2000 |
| 温度流量复合传感器. 朱玉江，刘炎，张德利，王香文.传感器技术，第19卷第1期. 2000 * |
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| CN101140178A (en) | 2008-03-12 |
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