CN2857024Y

CN2857024Y - Electroconducting open channel flow rate senser

Info

Publication number: CN2857024Y
Application number: CNU200520099751XU
Authority: CN
Inventors: 李小昱; 王为; 雷廷武; 李善军
Original assignee: Huazhong Agricultural University
Current assignee: Huazhong Agricultural University
Priority date: 2005-12-30
Filing date: 2005-12-30
Publication date: 2007-01-10
Anticipated expiration: 2015-12-30

Abstract

The utility model relates to an electrical conduction type open channel flow rate sensor comprising an organic glass shell, a shielded enclosure, a connecting pipe, a fixed board, an electrode fixed bed, an exciting electrode, an AC constant current generator, an upstream sensor, a downstream sensor, a conditioning circuit module I, a conditioning circuit module II, an output cable I, and an output cable II. During gathering the open channel flow rate data, two exciting electrode excite the upstream sensor and the downstream sensor respectively. Two flow noise signals are gathered by the upstream sensor and the downstream sensor respectively and then are outputted into computer through conditioning circuit modules. The sensor has the advantages of that: the sensor is convenient for use, the volume is small, the cost is lower, the open channel flow rate changes can be measured rapidly and accurately, the study of runoff rate of soil erosion and water and soil conservation can be executed.

Description

Conductance type open-channel flow flow sensor

Affiliated technical field

The utility model belongs to a kind of sensor, particularly a kind of conductance type open-channel flow flow sensor of measuring flow rate of water flow in water and soil conservation and the soil erosion study that is specifically designed to.

Background technology

Carry out the research of the water and soil conservation and the soil erosion, must pay attention to the collection of first-hand observational data, only in this way could be in the basic enterprising line data processing of science and the foundation of model.In water and soil conservation and soil erosion study, the open-channel flow flow velocity is an indispensable parameter in runoff calculating, the hydrologic forecast.For a long time, because do not have to measure specially the sensor and the testing tool of open-channel flow flow velocity, both at home and abroad all can not be well in real time, the dynamic process of on-line monitoring current, for water and soil conservation provides scientific basis.In order to study, observe and measure one of important parameter in water and soil conservation---the flow velocity of open-channel flow, need a kind of can be accurately, in real time, the special sensor of quick, on-line measurement, i.e. open-channel flow flow sensor.

The sensor of measuring flow rate of water flow is a lot, as supersonic flow speed sensors, heat-conducting flow sensor, laser current speed sensors, optical fiber flow sensor etc., these flow sensors only limit to the measurement (Huang Jichang of flow rate of liquid in the pipeline, Xu Qiaoyu, Zhang Haigui, Guo Jizhong, Fu Runhe. working sensor principle and application example. Beijing: People's Telecon Publishing House, 1999; Shi Wenkang, Yu Xiaofen. detection technique. Beijing: China Machine Press, 2000).At present, still do not have a kind of sensor special to measure the open-channel flow flow velocity, domestic and international research mechanism still adopts traditional " trace method " to measure the open-channel flow flow velocity.This method at first is provided with the section of predetermined distance length in runoff, by in the current of section starting point, throwing in dyestuff and picking up counting, when containing the current process section terminal point of dyestuff, finish timing, converse flow velocity (summer health, Lei Tingwu, the Zhao Jun of runoff with the flow time and the distance of flowing through, Zhang Qingwen, Gao Peiling. trace method is measured the research of flow rate of water flow. water and soil conservation journal, 2002,16 (1): 84～86).Flow rate of liquid measured sensor in the pipeline is because the restriction of principle of work and service condition all can't be applied to the measurement of open-channel flow flow velocity; " trace method " because of adopting manually-operated and observation, measuring accuracy is relatively poor and can not accurately, real-time, online carry out data acquisition and processing.

Summary of the invention

The purpose of this utility model is the conductance type open-channel flow flow sensor of a kind of simple in structure, stable performance of design, signal by sine-wave oscillator produces excitation by exciting electrode, utilization is gathered the two-way random signal at the upstream of same center line sensor and sensitive downstream device, carries out data processing and shows measurement result by conditioning circuit module input computing machine again.It can measure the variation of open-channel flow flow velocity fast, accurately, online, for the scientific research of the water and soil conservation and the soil erosion provides foundation.

The purpose of this utility model be achieved in that conductance type open-channel flow flow sensor by exciting electrode, shielded cable, exciting electrode cable, screened room, conditioning circuit module I, exchange constant current generator, output cable I, connecting pipe, fixed head, external cable, terminal box, input cable, output cable II, conditioning circuit module II, electrode fixed bed, organic glass outer cover, sensitive downstream device, upstream sensor, computing machine and sine-wave oscillator etc. and form.Two exciting electrodes are separately fixed at the two ends of electrode fixed bed, upstream sensor and sensitive downstream device are separately fixed at the middle part of electrode fixed head, the electrode fixed bed is embedded in the organic glass outer cover, screened room is installed in the top of organic glass outer cover, the connecting pipe bottom is connected with screened room, and fixed head is on the top of connecting pipe; The exciting electrode at two ends is connected with the interchange constant current generator by the exciting electrode cable, input cable incoming transport constant current generator; The upstream sensor inserts conditioning circuit module I by shielded cable, and output cable I inserts conditioning circuit module I; The sensitive downstream device inserts conditioning circuit module II by shielded cable, and output cable II inserts conditioning circuit module I; Output cable I, input cable enter terminal box respectively with output cable II and are connected with external cable.Output cable I is connected computing machine respectively with output cable II, and the input cable connects sine-wave oscillator.

When gathering the data of open-channel flow flow velocity, by fixed head conductance type open-channel flow flow sensor Parallel to the flow direction is placed in the current, the two-phase flow fluid that is mixed by water and silt flows through in the organic glass outer cover; The signal of sine-wave oscillator produces excitation by the exciting electrode at two ends, gathers the two-way flowing noise signal respectively at the upstream of same center line sensor and sensitive downstream device; Because fluid has conductivity, then exists impedance between upstream sensor and the sensitive downstream device, the variation with conductivity is converted into impedance variation like this, carries out data processing and shows measurement result by conditioning circuit module input computing machine again.

The advantage of conductance type open-channel flow flow sensor of the present utility model is: adopt two exciting electrodes respectively upstream sensor and sensitive downstream device to be produced excitation, upstream sensor and sensitive downstream device are gathered the two-way flowing noise signal, by conditioning circuit module input computing machine, have that volume is little, simple installation, service-strong characteristics, can measure the flow velocity of open-channel flow fast, accurately, online.

Description of drawings

Concrete structure of the present utility model is provided by following examples and accompanying drawing.

Fig. 1 is the structural representation of conductance type open-channel flow flow sensor of the present utility model.

Fig. 2 is the measuring system synoptic diagram that the utility model is formed.

Below in conjunction with Fig. 1, Fig. 2 to the detailed description of the invention.

Among the figure 1, exciting electrode, 2, shielded cable, 3, the exciting electrode cable, 4, screened room, 5, conditioning circuit module I, 6, exchange constant current generator, 7, output cable I, 8, connecting pipe, 9, fixed head, 10, external cable, 11, terminal box, 12, input cable, 13, output cable II, 14, conditioning circuit module II, 15, electrode fixed bed, 16, the organic glass outer cover, 17, the sensitive downstream device, 18, upstream sensor, 19, computing machine, 20, sine-wave oscillator

Embodiment

As shown in Figure 1: two exciting electrodes (1) are separately fixed at the two ends of electrode fixed bed (15), upstream sensor (18) and sensitive downstream device (17) are separately fixed at the middle part of electrode fixed bed (15), electrode fixed bed (15) is embedded in the organic glass outer cover (16), screened room (4) is installed in the top of organic glass outer cover (16), connecting pipe (8) bottom is connected with screened room (4), and fixed head (9) is on the top of connecting pipe (8); The exciting electrode at two ends (1) is connected with interchange constant current generator (6) by exciting electrode cable (3), input cable (12) incoming transport constant current generator (6); Upstream sensor (18) inserts conditioning circuit module I (5) by shielded cable (2), and output cable I (7) inserts conditioning circuit module I (5); Sensitive downstream device (17) inserts conditioning circuit module II (14) by shielded cable (2), and output cable II (13) inserts conditioning circuit module I (5); Output cable I (7), input cable (12) enter terminal box (11) respectively with output cable II (13) and are connected with external cable (10).

As shown in Figure 2: screened room (4) is installed at the top of organic glass outer cover (16), and is connected with fixed head (9) by connecting pipe (8); Output cable I (7) is connected computing machine (19) respectively with output cable II (13), and input cable (12) is connected in sine-wave oscillator (20).

Claims

1. conductance type open-channel flow flow sensor is by exciting electrode, shielded cable, the exciting electrode cable, screened room, conditioning circuit module I, exchange constant current generator, output cable I, connecting pipe, fixed head, external cable, terminal box, the input cable, output cable II, conditioning circuit module II, the electrode fixed bed, the organic glass outer cover, the sensitive downstream device, the upstream sensor is formed, it is characterized in that: two exciting electrodes are separately fixed at the two ends of electrode fixed bed, upstream sensor and sensitive downstream device are separately fixed at the middle part of electrode fixed head, the electrode fixed bed is embedded in the organic glass outer cover, screened room is installed in the top of organic glass outer cover, the connecting pipe bottom is connected with screened room, and fixed head is on the top of connecting pipe; The exciting electrode at two ends is connected with the interchange constant current generator by the exciting electrode cable, input cable incoming transport constant current generator; The upstream sensor inserts conditioning circuit module I by shielded cable, and output cable I inserts conditioning circuit module I; The sensitive downstream device inserts conditioning circuit module II by shielded cable, and output cable II inserts conditioning circuit module I; Output cable I, input cable enter terminal box respectively with output cable II and are connected with external cable.