CN205175579U

CN205175579U - Multichannel measuring unit based on GP21

Info

Publication number: CN205175579U
Application number: CN201521019280.7U
Authority: CN
Inventors: 马承志; 李粉
Original assignee: Yantai Aerospace Delu Energy Saving Technology Co Ltd
Current assignee: Yantai Aerospace Delu Energy Saving Technology Co Ltd
Priority date: 2015-12-09
Filing date: 2015-12-09
Publication date: 2016-04-20
Anticipated expiration: 2025-12-09

Abstract

The utility model discloses a multichannel measuring unit based on GP21, include: analog switch circuit, singlechip, binary channels flow sensor and GP21 measuring circuit, wherein, the singlechip binary channels flow sensor and the GP21 measuring circuit all is connected to analog switch circuit, binary channels flow sensor includes first sound channel flow sensor and second sound channel flow sensor, first sound channel flow sensor includes first sound channel upper reaches flow sensor and first sound channel low reaches flow sensor, second sound channel flow sensor includes second sound channel upper reaches flow sensor and second sound channel low reaches flow sensor. Therefore, the utility model discloses a multichannel measuring unit only adopts a slice GP21 chip to analog switch circuit controls two way flow sensor's switching respectively and measures, has not only reached the measurement effect, has improved measurement accuracy, still the cost is reduced.

Description

A kind of multichannel measuring unit based on GP21

Technical field

The utility model relates to ultrasonic heat metering industry field of instrumentation technology, particularly relates to a kind of multi-channel measurement unit for improving ultrasonic calorimeter accuracy of measurement and stability.

Background technology

Ultrasonic calorimeter primarily of ultrasonic flow sensor, pairing temperature sensor and integraph three part composition.Heavy caliber ultrasonic calorimeter generally adopts a pair ultrasonic transducer, launch and accept ultrasonic signal that pipeline hockets mutually is arranged in correlation mode, carry out the flow velocity of indirect inspection fluid by measuring ultrasound wave co-current flow and counter-current flow propagation time difference in media as well, then carry out calculated flow rate by flow velocity.

Metering circuit mainly separating component builds metering circuit, transmits and receives circuit respectively carry out time signal collection by analog switch.Because heavy caliber calorimeter bore is larger, fluid in the duct layering is serious, and the flow velocity near tube wall place fluid and pipeline axle center has very big-difference, and the flow of a pair transducer test can not represent the actual flow of whole tube fluid completely, cause measuring error comparatively large, degree of accuracy is not high.Meanwhile, according to hyperacoustic transmission speed, measuring accuracy requires in Ps rank, and separating component, due to the otherness of device, reduces the consistance of product.

Utility model content

The metering circuit of building for the existing single channel of heavy caliber calorimeter and separating component causes the technological deficiency that measuring accuracy is low, consistance is poor, the utility model proposes and a kind ofly adopt integral measuring chip GP21 and carry out the high-precision measurement circuit of binary channels flow measurement, namely based on a multichannel measuring unit of GP21, to improve consistance and the measuring accuracy of measurement.

The technical scheme that the utility model solves the problems of the technologies described above is as follows: a kind of multichannel measuring unit based on GP21, is characterized in that, comprising: analog switching circuit, single-chip microcomputer, binary channels flow sensor and GP21 metering circuit; Wherein, described single-chip microcomputer, described binary channels flow sensor and described GP21 metering circuit are all connected to described analog switching circuit; Described binary channels flow sensor comprises the first sound channel flow sensor and second sound channel flow sensor, described first sound channel flow sensor comprises the first sound channel upstream flowrate sensor and the first sound channel downstream flow sensors, and described second sound channel flow sensor comprises second sound channel upstream flowrate sensor and second sound channel downstream flow sensors.

On the basis of technique scheme, the utility model can also do following improvement.

Preferably, described analog switching circuit adopts 74HC4052 analog switch.

Preferably, the positive pole of described first sound channel upstream flowrate sensor is connected to the pin 1Y0 of described analog switching circuit, minus earth; The positive pole of described first sound channel downstream flow sensors is connected to the pin 2Y0 of described analog switching circuit, minus earth.

Preferably, the positive pole of described second sound channel upstream flowrate sensor is connected to the pin 1Y1 of described analog switching circuit, minus earth; The positive pole of described second sound channel downstream flow sensors is connected to the pin 2Y1 of described analog switching circuit, minus earth.

Preferably, the Enable Pin of described single-chip microcomputer is connected to the pin EN of described analog switching circuit, and two control ends of described single-chip microcomputer are connected to pin S0 and the pin S1 of described analog switching circuit respectively.

Preferably, the flow collection passage of described GP21 metering circuit is connected to pin 1Z and the pin 2Z of described analog switching circuit respectively.

Preferably, described single-chip microcomputer is MSP430F4152.

The beneficial effects of the utility model are: adopt integral measuring chip GP21, precision, in Ps level, is abandoned the device error that separating component brings, substantially increased the consistance of measurement; Adopt analog switch to control two flow sensor (that is, ultrasonic transducer) and be connected to GP21 respectively, start the ultrasound wave flight time measurement of upstream and downstream, measure respectively, get average, decrease the impact that bore increases the coefficient of viscosity brought, improve measuring accuracy; Only adopt a slice GP21 chip, control the handover measurement of two-way ultrasonic transducer with analog switch respectively, not only reach measurement effect, also reduce cost.

Accompanying drawing explanation

Fig. 1 is the structural representation of the multichannel measuring unit based on GP21 of the present utility model;

Fig. 2 is the pinouts of the analog switching circuit of the multichannel measuring unit based on GP21 of the present utility model;

Fig. 3 is the connecting terminals map interlinking of the binary channels flow sensor of the multichannel measuring unit based on GP21 of the present utility model.

In Fig. 1 ~ Fig. 3, the list of designations represented by each label is as follows:

100 analog switching circuits

200 single-chip microcomputers

300 binary channels flow sensors

310 first sound channel flow sensors

311 first sound channel upstream flowrate sensors

312 first sound channel downstream flow sensors

320 second sound channel flow sensors

321 second sound channel upstream flowrate sensors

322 second sound channel downstream flow sensors

400GP21 metering circuit

Embodiment

Be described principle of the present utility model and feature below in conjunction with accompanying drawing, example, only for explaining the utility model, is not intended to limit scope of the present utility model.

Please refer to shown in Fig. 1, it is the structural representation of the multichannel measuring unit based on GP21 of the present utility model.The described multichannel measuring unit based on GP21 comprises: analog switching circuit 100, single-chip microcomputer 200, binary channels flow sensor 300 and GP21 metering circuit 400; Wherein, described single-chip microcomputer 200, described binary channels flow sensor 300 and described GP21 metering circuit 400 are all connected to described analog switching circuit 100, described binary channels flow sensor 300 comprises the first sound channel flow sensor 310 and second sound channel flow sensor 320, further, described first sound channel flow sensor 310 comprises the first sound channel upstream flowrate sensor 311 and the first sound channel downstream flow sensors 312, and described second sound channel flow sensor 320 comprises second sound channel upstream flowrate sensor 321 and second sound channel downstream flow sensors 322.

In the utility model, described single-chip microcomputer 200, i.e. one chip microcomputer (SingleChipMicrocomputer), also known as micro-control unit (MicrocontrollerUnit; MCU), be preferably MSP430F4152, it is 16 super low-power consumption MCU, has 16KB flash memory, 512BRAM, 10 ADC, USCI, simulation COMP, 56 I/O and lcd drivers, dominant frequency 1MHz.

Next, please refer to shown in Fig. 2, it is the pinouts of the analog switching circuit of the multichannel measuring unit based on GP21 of the present utility model; It should be noted that, in fig. 2, what described analog switching circuit 100 adopted is 74HC4052 analog switch, but not as limit, it will be understood by those skilled in the art that the analog switching circuit that every function is identical or close all can be used for the multichannel measuring unit based on GP21 of the present utility model.Described 74HC4052 analog switch is a high-speed cmos device, two-way 4 tunnels analogy MUX/demultplexer, with Professional Association logic, (namely each MUX all comprises 4 independent input/output terminals, 1Y0 to 1Y3,2Y0 to 2Y3) and 1 public input/output terminal (that is, 1Z, 2Z); Highway selects logic to comprise 2 digital selecting sides (S0 and S1) and 1 Enable Pin (EN).

Below, understand incorporated by reference to shown in Fig. 2 and Fig. 3, Fig. 3 is the connecting terminals map interlinking of the binary channels flow sensor of the multichannel measuring unit based on GP21 of the present utility model; Wherein: the positive pole (that is, upstream _ 0) of described first sound channel upstream flowrate sensor 311 is connected to the pin 1Y0 of described analog switching circuit 100, minus earth; The positive pole (that is, downstream _ 0) of described first sound channel downstream flow sensors 312 is connected to the pin 2Y0 of described analog switching circuit 100, minus earth.Similarly, the positive pole (that is, upstream _ 1) of described second sound channel upstream flowrate sensor 321 is connected to the pin 1Y1 of described analog switching circuit 100, minus earth; The positive pole (that is, downstream _ 1) of described second sound channel downstream flow sensors 322 is connected to the pin 2Y1 of described analog switching circuit 100, minus earth.

Shown in Fig. 2, the Enable Pin of described single-chip microcomputer 200 is connected to the pin EN of described analog switching circuit 100, and two control ends of described single-chip microcomputer 200 are connected to pin S0 and the pin S1 of described analog switching circuit 100 respectively; Described GP21 metering circuit 400 adopts GP21 flow measurement chip, and its flow collection passage is connected to pin 1Z and the pin 2Z of described analog switching circuit 100 respectively, to measure the flow of upstream and downstream respectively.

Thus, when the multichannel measuring unit based on GP21 of the present utility model needs to carry out flow measurement, first described single-chip microcomputer 200 passes through the enable described analog switching circuit 100 of Enable Pin, then---

The control end of described single-chip microcomputer 200 starts passage 0 by pin S0, first sound channel flow sensor 310 and described GP21 metering circuit 400 described in described analog switching circuit 100 UNICOM, thus, described single-chip microcomputer 200 controls by SPI interface 4 line communication mechanism the ultrasound wave differential time of flight that upstream and downstream measured by described GP21 metering circuit 400 and described first sound channel flow sensor 310;

After described first sound channel flow sensor 310 has been measured, the control end of described single-chip microcomputer 200 starts passage 1 by pin S1, second sound channel flow sensor 320 described in described analog switching circuit 100 UNICOM and described GP21 metering circuit 400, thus, described single-chip microcomputer 200 controls by SPI interface 4 line communication mechanism the ultrasound wave differential time of flight that upstream and downstream measured by described GP21 metering circuit 400 and described second sound channel flow sensor 320;

Finally, the measurement result of twice is averaged, calculate accurate differential time of flight, and then calculate flow velocity and flow value.

Multichannel measuring unit based on GP21 of the present utility model only adopts a slice GP21 chip, controls the handover measurement of two-way flow sensor respectively, not only reach measurement effect, improve measuring accuracy, also reduce cost with analog switching circuit.

The foregoing is only preferred embodiment of the present utility model, not in order to limit the utility model, all within spirit of the present utility model and principle, any amendment done, equivalent replacement, improvement etc., all should be included within protection domain of the present utility model.

Claims

1. based on a multichannel measuring unit of GP21, it is characterized in that, comprising: analog switching circuit, single-chip microcomputer, binary channels flow sensor and GP21 metering circuit; Wherein,

Described single-chip microcomputer, described binary channels flow sensor and described GP21 metering circuit are all connected to described analog switching circuit;

Described binary channels flow sensor comprises the first sound channel flow sensor and second sound channel flow sensor, described first sound channel flow sensor comprises the first sound channel upstream flowrate sensor and the first sound channel downstream flow sensors, and described second sound channel flow sensor comprises second sound channel upstream flowrate sensor and second sound channel downstream flow sensors.

2. multichannel measuring unit according to claim 1, is characterized in that, described analog switching circuit adopts 74HC4052 analog switch.

3. multichannel measuring unit according to claim 2, is characterized in that, the positive pole of described first sound channel upstream flowrate sensor is connected to the pin 1Y0 of described analog switching circuit, minus earth; The positive pole of described first sound channel downstream flow sensors is connected to the pin 2Y0 of described analog switching circuit, minus earth.

4. multichannel measuring unit according to claim 2, is characterized in that, the positive pole of described second sound channel upstream flowrate sensor is connected to the pin 1Y1 of described analog switching circuit, minus earth; The positive pole of described second sound channel downstream flow sensors is connected to the pin 2Y1 of described analog switching circuit, minus earth.

5. multichannel measuring unit according to claim 2, it is characterized in that, the Enable Pin of described single-chip microcomputer is connected to the pin EN of described analog switching circuit, and two control ends of described single-chip microcomputer are connected to pin S0 and the pin S1 of described analog switching circuit respectively.

6. multichannel measuring unit according to claim 2, is characterized in that, the flow collection passage of described GP21 metering circuit is connected to pin 1Z and the pin 2Z of described analog switching circuit respectively.

7. the multichannel measuring unit according to any one of claim 1 ~ 6, is characterized in that, described single-chip microcomputer is MSP430F4152.