CN201255645Y

CN201255645Y - Microwave flow detector

Info

Publication number: CN201255645Y
Application number: CNU2008201228049U
Authority: CN
Inventors: 郝培文; 臧金海; 贺燕良
Original assignee: Beijing Tkhz Science & Technology Co Ltd
Current assignee: Beijing Tkhz Science & Technology Co Ltd
Priority date: 2008-09-25
Filing date: 2008-09-25
Publication date: 2009-06-10
Anticipated expiration: 2018-09-25

Abstract

The utility model relates to a microwave flow detector which comprises a guide pipe connected with a pipeline for material flow to be detected to go through, and a microwave detecting device fixed on the guide pipe; the microwave detecting device comprises a shell, a microwave probe which is arranged on one end of the shell, used to send detecting signal to the material to be detected and receive the reflection signal of the material to be detected, a pulse rectifying circuit used to rectify the received reflection signal, and a single-chip microcomputer control circuit used to calculate the flow of the material to be detected according to the rectified signal. The microwave flow detector uses a Doppler flow measurement principle, sends and receives signal by the microwave probe, is not impacted by the changes to all steam, temperature, pressure and the like when measuring the flow of solid in the pipeline, is a non-contact microwave flow detector, and has the advantages of accurate measuring result and wide scope of application.

Description

Microwave flow detector

Technical field

The utility model relates to a kind of fields of measurement, especially a kind of microwave flow detector.

Background technology

The instrument of measuring flow is referred to as flowmeter or flowmeter.Flowmeter is one of instrument important in the commercial measurement, and more and more higher to the requirement of the accuracy of traffic probe and scope along with industrial development, the traffic probe technology is maked rapid progress, and in order to adapt to various uses, various types of flowmeters are come out one after another.

Need transmit various solia particles in fields such as petrochemical complex, metallurgy, cement/glass building material industry, electric power, mining, water and wastewater treatments, such as chemical fertilizer, coal dust, alumina powder etc., therefore, need the transmission of these solia particles be monitored, when sending out existing problem with box lunch, handle it timely, avoid producing greater loss.At present, the mode of Solid Conveying and Melting adopts strength to carry mostly, when traffic probe adopts the contact flow probe, owing to will directly contact with the material that transmits, therefore be subjected to influence that steam, medium temperature and pressure changes greatly, when using under the rugged environment, exist accuracy and reliability not high, can not reflect defectives such as actual field situation exactly.And in existing working environment, the electromagnetic radiation that various electric equipments produce is more, and flow probe is also had considerable influence, therefore in order to survey solid flow exactly, needs to improve the anti-electromagnetic-radiation performance of flow probe.

The utility model content

In order to solve the inaccurate and not high problem of measuring accuracy of contact flow probe measurement result in the prior art, the utility model provides a kind of microwave flow detector, can realize touchless traffic probe, and can improve the anti-electromagnetic-radiation performance of flow probe, comprise:

Conduit with the pipeline of determinand materials flow warp is connected is fixed in described supravasal microwave sounding unit, MSU;

Described microwave sounding unit, MSU comprises: housing; Be successively set on housing one end, be used for and receive the microwave probe of the reflected signal of described material to be measured to material emission detection signal to be measured, the pulse shaping circuit that the described reflected signal that receives is carried out shaping, and according to the single chip machine controlling circuit of the flow of the described material to be measured of calculated signals after the shaping.

Preferably, the detectable signal of described microwave probe emission is the ultrasonic listening signal.

Described microwave sounding unit, MSU also comprises the relay output circuit of adjusting actuating of relay time delay and detectable signal range-sensitivity by toggle switch, is connected with described single chip machine controlling circuit.Be provided with control panel in described housing, the toggle switch of adjusting described relay output circuit is arranged on the described control panel.

Described microwave sounding unit, MSU also comprises: the other end at described housing is provided with end cap.Be provided with the ring flange that is used for fixing described microwave sounding unit, MSU between described microwave sounding unit, MSU and described conduit, described ring flange center offers and is used for seeing through the hole that sees through that described microwave probe transmits and receives signal.

The utility model provides a kind of microwave flow detector, utilize Doppler's flow measurement principle, by microwave probe emission, received signal, by transmit and received signal between frequency difference etc. can the Fluid Computation flow, realized the influence that not changed by various steam, temperature and pressure etc. in the process of fluid flow in measuring channel, be a kind of non-contact type microwave flow detector, measurement result is accurate, and the scope of application is extensive.

Description of drawings

Fig. 1 is the mounting structure figure of the utility model microwave flow detector embodiment;

Fig. 2 is the synoptic diagram of the utility model microwave flow detector embodiment;

Fig. 3 is the synoptic diagram of the utility model microwave flow detector embodiment control panel.

Description of reference numerals:

1-microwave probe; 2-pulse shaping circuit; 3-single chip machine controlling circuit;

4-relay output circuit; 5-housing; 6-end cap;

7-ring flange; 8-through the hole; 9-cable;

10-microwave sounding unit, MSU; 11-control panel; 12-toggle switch;

13-conduit; 14-pipeline; 15-welding flange.

Embodiment

Below by drawings and Examples, the technical solution of the utility model is described in further detail.

Doppler effect is for when having relative motion between sound source and the observer, and the acoustic frequency that the observer experienced will be different from the frequency that sound source is sent.Because of the frequency change of caused by relative motion is directly proportional with the relative velocity of two articles.Transmitter is a stationary sound source, " observer " that the solid particle that moves with fluid has played to have with sound source relative motion, but it only is that receiver is returned in the signal reflex of inciding on the solid particle.Transmit and received signal between difference on the frequency, be exactly the acoustic doppler frequency displacement that produces owing to solid particle motion in the fluid.Because this difference on the frequency is proportional to rate of flow of fluid, thus can be by the measurement frequency difference in the hope of flow velocity, and then can obtain the flow of fluid.

Fig. 1 is the mounting structure figure of the utility model microwave flow detector embodiment, and Fig. 2 is the synoptic diagram of the utility model microwave flow detector embodiment.As shown in Figure 1, this microwave flow detector comprises: the conduit 13 with the pipeline 14 of determinand materials flow warp is connected, be fixed in the microwave sounding unit, MSU 10 on the conduit 13; Wherein microwave sounding unit, MSU 10 comprises housing 5; As shown in Figure 2, microwave sounding unit, MSU 10 also comprises and is successively set on housing 5 one ends, is used for to material emission detection signal to be measured and receives the microwave probe 1 of the reflected signal of described material to be measured, the pulse shaping circuit 2 that the described reflected signal that receives is carried out shaping, and according to the single chip machine controlling circuit 3 of the flow of the described material to be measured of calculated signals after the shaping.

Further, the detectable signal of microwave probe 1 emission can be preferably the ultrasonic listening signal; As shown in Figure 1, the other end at housing 5 is provided with end cap 6; Be provided with the ring flange 7 that is used for fixing microwave sounding unit, MSU 10 between microwave sounding unit, MSU 10 and conduit 13, ring flange 7 centers offer and are used for seeing through that microwave probe 1 transmits and receives signal sees through hole 8; Conduit 13 is preferably with the angular range of pipeline 14: 45 °～90 °.Can also be provided with on the housing 5 and be used for the cable 9 that is connected with external unit, cable 9 outer peripheral can be provided with the waterproof ply-yarn drill.

Particularly, microwave sounding unit, MSU 10 is connected with conduit 13 with welding flange 15 on the conduit 13 by the ring flange on the microwave sounding unit, MSU 10 7, it is fixing that angle between conduit 13 and the pipeline 14 can be adjusted the back in advance, the span of angle α is between 45 °～90 °, by this connected mode, produce a measurement field, microwave probe 1 is to material emission ultrasonic signal to be measured during measurement, ultrasonic signal is from seeing through hole 8 transmissions, through material reflection to be measured, received by microwave probe 1, sensor in the microwave probe 1 is converted into electric signal with this reflected signal, this electric signal carries out shaping by pulse shaping circuit 2, filtering, amplify and wait operation back input single chip machine controlling circuit 3, single chip machine controlling circuit 3 calculates the flow of this material to be measured according to this input signal.Can adopt specific frequency, make when material particulate to be measured flows, sensor can measure signal, and when solid accumulation to be measured, then measures less than signal, to realize detecting the effect whether material to be measured in the pipeline 14 stops up.

In addition, this microwave flow detector can also comprise the relay output circuit 4 of adjusting actuating of relay time delay and detectable signal range-sensitivity by toggle switch, is connected with single chip machine controlling circuit 3.Fig. 3 is the synoptic diagram of the utility model microwave flow detector embodiment control panel, as shown in Figure 3, is provided with control panel 11 in housing 5, and the toggle switch 12 of adjusting the relay output circuit is arranged on the control panel 11.For example, before the measurement,, the sensitivity of actuating of relay time delay and detectable signal distance is set,, increases the numerical value of toggle switch 12,, reduce the numerical value of toggle switch 12 if instrument is highly sensitive if the sensitivity of instrument is low by the numerical value of toggle switch is set.When measuring beginning, if having Flow of Goods and Materials then the relay adhesive make normally opened contact (NO) adhesive, make normally closed contact (NC) adhesive if no streams is moved then relay adhesive; Can indicate in the pipeline be flow normally or stop up.When the speed of Flow of Goods and Materials was not less than 0.1m/s, measurement result was more accurate.

The utility model microwave flow detector embodiment utilizes Doppler's flow measurement principle, by measuring microwave probe emission, received signal, calculating transmit and received signal between frequency difference etc., obtain fluid flow, realize the influence that not changed by various steam, temperature and pressure etc. in the process of fluid flow in measuring channel, improved the anti-electromagnetic-radiation performance of flow probe; When adjust measuring and the angle of pipe under test, make measurement result more accurate, the scope of application is more extensive.

It should be noted last that: above embodiment only in order to the explanation the technical solution of the utility model, but not makes restrictive sense to the utility model.Although the utility model is had been described in detail with reference to above-mentioned preferred embodiment, those of ordinary skill in the art is to be understood that: it still can make amendment or be equal to replacement the technical solution of the utility model, and this modification or be equal to the spirit and scope that replacement does not break away from technical solutions of the utility model.

Claims

1, a kind of microwave flow detector is characterized in that, comprising: the conduit with the pipeline of determinand materials flow warp is connected, be fixed in described supravasal microwave sounding unit, MSU;

2, microwave flow detector according to claim 1 is characterized in that, the detectable signal of described microwave probe emission is the ultrasonic listening signal.

3, microwave flow detector according to claim 1, it is characterized in that, described microwave sounding unit, MSU also comprises the relay output circuit of adjusting actuating of relay time delay and detectable signal range-sensitivity by toggle switch, is connected with described single chip machine controlling circuit.

4, microwave flow detector according to claim 3 is characterized in that, is provided with control panel in described housing, and the toggle switch of adjusting described relay output circuit is arranged on the described control panel.

5, microwave flow detector according to claim 1 is characterized in that, described microwave sounding unit, MSU also comprises: the other end at described housing is provided with end cap.

6, microwave flow detector according to claim 1, it is characterized in that, be provided with the ring flange that is used for fixing described microwave sounding unit, MSU between described microwave sounding unit, MSU and described conduit, described ring flange center offers and is used for seeing through the hole that sees through that described microwave probe transmits and receives signal.

7, according to the described microwave flow detector of the arbitrary claim of claim 1～6, it is characterized in that the angular range of described conduit and described pipeline is: 45 °～90 °.