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An ultrasonic heat meter empty pipe detection system and method

A technology of empty pipe detection and heat meter, applied in the direction of heat measurement, calorimeter, measuring device, etc., can solve the problems of poor matching of ultrasonic heat meter, loss of conductivity of electrode surface, increase of complexity of empty pipe, etc., to achieve The detection method is convenient and fast, the structure is ingenious, and the effect of small error

Active Publication Date: 2018-04-06
北京捷成世纪智能科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] For the ultrasonic heat meter, the simple empty pipe detection method is to determine the empty pipe by detecting the loss of the ultrasonic signal. Although this method can save the empty pipe sensor, sometimes when the ultrasonic signal is lost, it is not equal to the empty pipe. , thus increasing the complexity of judging empty traffic, and the error is large
The commonly used method is to use an electrode sensor to directly measure the conductivity of the liquid, but the surface of the electrode is easily oxidized by electro-corrosion and gradually loses conductivity, and the electrode needs to be cleaned frequently, which has the disadvantages of low efficiency and cumbersome operation
A more reliable method is to use a capacitive sensor to measure the change of the liquid level, and judge whether the pipe section is an empty pipe according to the change of the liquid level. However, the existing capacitive sensors on the market are expensive, and there is a mismatch when they are installed on an ultrasonic heat meter. Therefore, the development of a low-cost capacitive sensor dedicated to empty pipe detection will help to improve the detection performance of ultrasonic heat meters

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  • An ultrasonic heat meter empty pipe detection system and method
  • An ultrasonic heat meter empty pipe detection system and method
  • An ultrasonic heat meter empty pipe detection system and method

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Embodiment 1

[0038] see figure 1 and 2 , the present invention provides a capacitive sensor for ultrasonic heat meter empty pipe detection, comprising a detection electrode 1, a dielectric 2, an external electrode 3, the external electrode 3 is arranged on the metal pipe surface of the ultrasonic heat meter, and the detection electrode 1 Insert into the metal pipe of the ultrasonic heat meter, the detection electrode 1 is a cylindrical conductor, the surface of the detection electrode is sealed with an insulating layer, and the insulating layer is a dielectric 2; the detection electrode 1 passes through the dielectric 2 and the water or air in the metal pipe touch. The depth of the detection electrode inserted into the metal pipe can be adjusted, the depth refers to the length of the detection electrode located in the metal pipe, the combination of the detection electrode, the external electrode and the water or air in the metal pipe constitutes a variable area capacitive sensor.

[003...

Embodiment 2

[0044] The present invention also provides an empty tube detection system for an ultrasonic heat meter, which includes a charging and discharging circuit and a detection circuit. The charging and discharging circuit is composed of a reference capacitor, a resistor, and the above-mentioned capacitive sensor in parallel, or a reference capacitor and a resistor in parallel. The detection circuit includes a detection module, a calculation module and a judgment module,

[0045] The detection module is used to detect the discharge of the capacitive sensor and the reference capacitor from the power supply voltage Vcc to the reference voltage V REF The required discharge time t CSENS and the reference capacitor is discharged from the supply voltage Vcc to the reference voltage V REF The required discharge time t CREF ,

[0046] The calculation module is used to detect the discharge time t CSENS and t CREF Perform difference calculation to get the actual discharge time t of the ca...

Embodiment 3

[0057] The present invention also provides a method for detecting an empty pipe of an ultrasonic heat meter. The method uses the above-mentioned empty pipe detection system for an ultrasonic heat meter to detect the metal pipe of the ultrasonic heat meter, including the following steps:

[0058] S1. Connect the capacitive sensor, reference capacitor and resistor in parallel to form a charging and discharging circuit, and detect the discharge of the capacitive sensor and reference capacitor from the power supply voltage Vcc to the reference voltage V REF The required discharge time t CSENS ;

[0059] S2. Connect the reference capacitor and resistor in parallel to form a charging and discharging circuit, and detect the discharge of the reference capacitor from the power supply voltage Vcc to the reference voltage V REF The required discharge time t CREF ;

[0060] S3, the discharge time t to be detected CSENS and t CREF Perform difference calculation to get the actual disch...

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Abstract

The invention relates to the field of ultrasonic heat meter blank pipe detection, particularly to a capacitive sensor, an ultrasonic heat meter blank pipe detection system containing the capacitive sensor, and a detection method. Information of a water-contained or water-free state of a metallic pipe of an ultrasonic heat meter is converted into a capacitance value change; and whether the pipe is a blank pipe is determined by measuring the capacitance. The capacitive sensor developed independently is combined with a single-chip microcomputer technology and the value of the capacitive sensor is solved based on margin calculation; and comparison is carried out to determine whether the metallic pipe is a blank one. According to the invention, the capacitive sensor has an ingenious structure and the cost is low; and matching of the sensor with the ultrasonic heat meter is high. The ultrasonic heat meter blank pipe detection system is designed reasonably; and the detection method can be operated conveniently and rapidly. Compared with the prior art, the system and method have advantages of low error and high efficiency.

Description

technical field [0001] The invention relates to the field of ultrasonic heat meter empty pipe detection, in particular to an ultrasonic heat meter empty pipe detection system and method. Background technique [0002] The ultrasonic heat meter includes a base meter and a pipe section. The inlet and outlet ends of the pipe section are connected to the pipeline of the heating system. The ultrasonic heat meter is an instrument that measures the flow rate and displays the heat energy released or absorbed by the water flowing through the heat exchange system through ultrasonic methods. It uses the physical quantities measured by two sensors - the flow rate of the heat carrier and the temperature of the inlet and outlet, and then through the compensation and integral calculation of the density and enthalpy value, the calorific value can be obtained. It is a mechatronics product based on microprocessors and high-precision sensors, and it has been successfully applied in many fields....

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01K19/00
CPCG01K19/00
Inventor 杨留印杨成华杨光张锦飞
Owner 北京捷成世纪智能科技有限公司