CN208832126U - A kind of pipeline leak detection instrument - Google Patents

Abstract

It leaks hunting a kind of pipeline leak detection instrument in field the utility model discloses pressure pipeline, including host, sound pick-up, monitoring headpone and active noise reduction module, active noise reduction module includes the first noise reduction module and the second noise reduction module, first noise reduction module is connect with sound pick-up and host respectively, and the second noise reduction module is connect with monitoring headpone and host respectively.The active noise reduction module for offsetting environmental noise is added in pipeline leak detection instrument, can be effectively reduced outside noise and leak hunting the interference of effect to leak detector.

Description

A kind of pipeline leak detection instrument

Technical field

It leaks hunting field the utility model relates to pressure pipeline, specifically discloses a kind of pipeline leak detection instrument

Background technique

Existing leak test plant mainly passes through acquisition missed signal and is judged, and missed signal is by ambient noise, pipeline Transaudient characteristic and test point position, embedded situation influence anti-interference ability and data processing very big, therefore that improve leak detecting device Ability reduces noise jamming and is very helpful to the promotion for the accuracy leaked hunting.

All sound is all made of certain frequency spectrum, if a kind of sound can be found, is made its frequency spectrum and to be eliminated Noise it is just the same, only phase is just opposite (180 ° of difference), so that it may be completely counterbalanced by this noise.From noise source sheet Hand is worn to turn the phase of former noise around by electronic circuit to offset noise.

Utility model content

The utility model aim is being provided in a kind of pipeline leak detection instrument, to solve technological deficiency existing in the prior art.

To achieve the above object, the utility model provides a kind of pipeline leak detection instrument, including host, sound pick-up, monitoring ear Machine and active noise reduction module, active noise reduction module include the first noise reduction module and the second noise reduction module, the first noise reduction module difference It is connect with sound pick-up and host, the second noise reduction module is connect with monitoring headpone and host respectively.

Preferably, host includes CPU and the noise treatment module connecting with CPU, speech processing module, multi-path choice prison Module, touch screen and storage card are listened, sound pick-up is connected to the input terminal of noise treatment module, and the second noise reduction module is connected to multichannel The output end of module is monitored in selection, and multi-path choice monitors the input terminal of module and noise treatment module and speech processing module connect It connects.

Preferably, noise treatment module includes sequentially connected pre-amplification circuit, 50Hz trap circuit, eight rank low pass filtereds Wave circuit, high-pass filtering circuit, the first rear class amplifying circuit, programmable bandwidth-limited circuit, the second rear class amplifying circuit sum number Word filtering/spectrum analyzer circuit, digital filtering/spectrum analyzer circuit output end are connect with CPU, and the first noise reduction module is connected to The input terminal of pre-amplification circuit, the output end of pre-amplification circuit are also attached to the input terminal that multi-path choice monitors module.

Preferably, it includes variable connector and power amplifier that multi-path choice, which monitors module, variable connector and pre-amplification circuit, Second rear class amplifying circuit and speech processing module are separately connected, and the output end of power amplifier is connect with the second noise reduction module.

Preferably, pipeline leak detection instrument further includes microphone, and microphone is connected to the input terminal of speech processing module.

Preferably, the input terminal of eight rank low-pass filter circuits is also connect with CPU.

Preferably, the first noise reduction module include sound pick-up M1, sound pick-up M2, chip J1, capacitor C5, capacitor C6, capacitor C7, Capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C17, capacitor C18, resistance R5, resistance R6, resistance R7, electricity Hinder R8, resistance R9, resistance R10, resistance R11, resistance R12, the first pin of resistance R17 and resistance R18, chip J1, capacitor C5, The first pin serial connection connection of resistance R5, resistance R8, resistance R9, capacitor C8 and sound pick-up M1, one end of capacitor C7 and resistance The connecting pin of R5 and resistance R9 connect and connect with one end of resistance R7, the other end ground connection of capacitor C7, the other end of resistance R7 Ground connection；Capacitor C9 is connected in parallel with resistance R9；The connecting pin of resistance R9 and resistance R8 is as the first signal output end；Capacitor C6's One end connect with the connecting pin of the first pin of sound pick-up M1 and capacitor C8 and connect with one end of resistance R6, and capacitor C6's is another End ground connection, another termination power of resistance R6；The second pin of sound pick-up M1 is grounded；The second pin of chip J1 is grounded；Chip First pin string of the third pin of J1, capacitor C10, resistance R10, resistance R12, resistance R18, capacitor C18 and sound pick-up M2 Connection connection, one end of capacitor C11 connect with the connecting pin of resistance R10 and resistance R12 and connect with one end of resistance R11, capacitor The other end of C11 is grounded, the other end ground connection of resistance R11；The connecting pin of resistance R12 and resistance R18 is exported as second signal End；Capacitor C12 is connected in parallel with resistance R12；The connection of one end of capacitor C17 and the first pin of sound pick-up M2 and capacitor C18 End connects and connect with one end of resistance R17, the other end ground connection of capacitor C17, another termination power of resistance R17；Sound pick-up The second pin of M2 is grounded.

Preferably, the second noise reduction module includes loudspeaker SPK1, loudspeaker SPK2, chip U2, resistance R13, resistance R14, resistance R15, resistance R16, capacitor C13, capacitor C14, capacitor C15, capacitor C16, capacitor C20, capacitor C21, switch SW1A, switch The 1st pin of SW1B, switch SW1C and switch SW1D, chip U2 are connect with 12 pins of the one end resistance R13 and switch SW1D, The resistance R13 other end connect with the 4th pin of chip U2 and as the first signal input part, the 4th pin of chip U2 also with electricity The connection of the one end R14 is hindered, the resistance R14 other end is connect with the one end capacitor C20, and the 3rd pin of the capacitor C20 other end and chip U2 connect It connects；The 5th pin of chip U2 is grounded；The 1st pin of the 11st pin of chip U2 and the one end resistance R15 and switch SW1A connect Connect, the resistance R15 other end connect with the 9th pin of chip U2 and as second signal input terminal, the 9th pin of chip U2 also with The connection of the one end resistance R16, the resistance R16 other end are connect with the one end capacitor C21, and the capacitor C21 other end draws with the 10th of chip U2 Foot connection；The 6th pin of chip U2 connects power supply and connect with the one end capacitor C13 and the one end capacitor C14, capacitor C13 and capacitor The other end of C14 is grounded；The 8th pin of chip U2 connects power supply and connect with the one end capacitor C15 and the one end capacitor C16, electricity The other end for holding C15 and capacitor C16 is grounded；The 9th pin of switch SW1C is connect with the second pin of chip U2, switch SW1C The 8th pin connection loudspeaker SPK1 cathode, the 7th pin of switch SW1C is as monitoring headpone anode input signal end；Switch The 10th pin of SW1D is grounded, the cathode anode of the 11st pin connection loudspeaker SPK1 of switch SW1D；The 4th pin of switch SW1B It is connect with the 12nd pin of chip U2, the cathode of the 5th pin connection loudspeaker SPK2 of switch SW1C, the 6th pin of switch SW1C As monitoring headpone cathode input signal end；The 3rd pin of switch SW1A is grounded, and the 2nd pin of switch SW1D connects loudspeaker The cathode anode of SPK2.

The utility model has the following beneficial effects:

1, the utility model is respectively arranged an active noise reduction module in the input terminal and output end of host, can be effective Ambient noise is offset, interference of the external noise to effect of leaking hunting is reduced.Simultaneously because being not necessarily to external noise reduction module, survey pipeline It is more succinct to leak instrument.

2, the utility model by 50Hz trap circuit, eight rank low-pass filter circuits, high-pass filtering circuit and digital filtering/ The noise treatments module such as spectrum analyzer circuit can rapidly and accurately exclude the interference of environmental noise, screen out leak noise, especially It is effectively isolated digital signal and analog signal, eliminates the noise generated by digital circuit, improves leak detector Anti-interference and accuracy.

Below with reference to accompanying drawings, the utility model is described in further detail.

Detailed description of the invention

The attached drawing constituted part of this application is used to provide a further understanding of the present invention, the utility model Illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.In attached drawing In:

Fig. 1 is a kind of system construction drawing of pipeline leak detection instrument of the preferred embodiment in the utility model；

Fig. 2 is a kind of host system structure chart of pipeline leak detection instrument of the preferred embodiment in the utility model；

Fig. 3 is the circuit diagram of the first noise reduction module of the preferred embodiment in the utility model；

Fig. 4 is the circuit diagram of the second noise reduction module of the preferred embodiment in the utility model.

Wherein, 1, host；11, noise treatment module；12, multi-path choice monitors module；13, speech processing module；14, it touches Touch screen；15, storage card；2, active noise reduction module；21, the first noise reduction module；22, the second noise reduction module；3, sound pick-up；4, it monitors Earphone；5, microphone.

Specific embodiment

The embodiments of the present invention are described in detail below in conjunction with attached drawing, but the utility model can be by right It is required that the multitude of different ways for limiting and covering is implemented.

To achieve the above object, the utility model provides a kind of pipeline leak detection instrument, as shown in Figure 1, including host 1, picking up Sound device 3, monitoring headpone 4 and active noise reduction module 2, active noise reduction module 2 include the first noise reduction module 21 and the second noise reduction module 22, the first noise reduction module 21 is connect with sound pick-up 3 and host 1 respectively, the second noise reduction module 22 respectively with monitoring headpone 4 and main Machine 1 connects.

Preferably, as shown in Fig. 2, host 1 includes CPU and the noise treatment module 11 connecting with CPU, speech processes mould Block 13, multi-path choice monitor module 12, touch screen 14 and storage card 15, sound pick-up 3 and are connected to the input of noise treatment module 11 End, the second noise reduction module 22 are connected to the output end that multi-path choice monitors module 12, and multi-path choice monitors the input terminal of module 12 It is connect with noise treatment module 11 and speech processing module 13.

The leak sound is collected by sound pick-up 3, after the leak sound being collected into passes through the first noise reduction module 21, ring therein Border noise is cancelled, and the leak sound received is then transmitted to noise treatment module 11 and is filtered, will be screened out Leak noise carry out digital filtering/spectrum analysis after, convert through CPU and shown by touch screen 14, operator can be intuitive Observe corresponding instantaneous noise signal within the scope of corresponding frequencies in ground；Corresponding Filtering Analysis mould is selected according to the distribution of frequency Formula, and operational order is issued by touch screen 14 and is filtered analysis, the more close leakage point position of reselection is collected again Noise carries out accurate measurement or point is surveyed, and touch screen 14 can draw the continuous noise curve in certain time automatically.Wherein fine mode The interference of ambient noise can be excluded, judgement is further analyzed in the suspicious leakage point that point survey mode can detect investigation to early period. Noise and voice can be monitored by monitoring headpone 4 simultaneously, the input terminal of monitoring headpone 4 is provided with the second noise reduction module 22, will be by Ambient noise in the noise and voice of monitoring is offset, and allows the operator to carry out more accurately judgement.

Preferably, noise treatment module 11 includes sequentially connected pre-amplification circuit, 50Hz trap circuit, eight rank low passes Filter circuit, high-pass filtering circuit, the first rear class amplifying circuit, programmable bandwidth-limited circuit, the second rear class amplifying circuit and Digital filtering/spectrum analyzer circuit, digital filtering/spectrum analyzer circuit output end are connect with CPU, and the first noise reduction module 21 connects It is connected to the input terminal of pre-amplification circuit, the output end of pre-amplification circuit is also attached to the input that multi-path choice monitors module 12 End.

Preferably, it includes variable connector and power amplifier that multi-path choice, which monitors module 12, and variable connector and preposition amplification are electric Road, the second rear class amplifying circuit and speech processing module 13 are separately connected, the output end of power amplifier and the second noise reduction module 22 connections.

Preferably, pipeline leak detection instrument further includes microphone 5, and microphone 5 is connected to the input terminal of speech processing module 13.It can The position that current noise is recorded by microphone 5, understands specific location when facilitating post analysis, makes the determination of leakage point position more Accelerate prompt；

Preferably, the input terminal of eight rank low-pass filter circuits is also connect with CPU.

Preferably, referring to Fig. 3, sound pick-up M1, sound pick-up M2, chip J1, capacitor C5, capacitor C6, capacitor C7, capacitor C8, Capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C17, capacitor C18, resistance R5, resistance R6, resistance R7, resistance R8, electricity Hinder R9, resistance R10, resistance R11, resistance R12, the first pin of resistance R17 and resistance R18, chip J1, capacitor C5, resistance R5, The first pin serial connection connection of resistance R8, resistance R9, capacitor C8 and sound pick-up M1, one end of capacitor C7 and resistance R5 and resistance The connecting pin of R9 connects and connect with one end of resistance R7, the other end ground connection of capacitor C7, the other end ground connection of resistance R7；Capacitor C9 is connected in parallel with resistance R9；The connecting pin of resistance R9 and resistance R8 is as the first signal output end；One end of capacitor C6 with pick up The first pin of sound device M1 and the connecting pin of capacitor C8 connect and connect with one end of resistance R6, the other end ground connection of capacitor C6, Another termination power of resistance R6；The second pin of sound pick-up M1 is grounded；The second pin of chip J1 is grounded；The third of chip J1 The first pin serial connection connection of pin, capacitor C10, resistance R10, resistance R12, resistance R18, capacitor C18 and sound pick-up M2, electricity The one end for holding C11 connect with the connecting pin of resistance R10 and resistance R12 and connect with one end of resistance R11, and capacitor C11's is another End ground connection, the other end ground connection of resistance R11；The connecting pin of resistance R12 and resistance R18 is as second signal output end；Capacitor C12 It is connected in parallel with resistance R12；One end of capacitor C17 connect with the connecting pin of the first pin of sound pick-up M2 and capacitor C18 and with One end of resistance R17 connects, the other end ground connection of capacitor C17, another termination power of resistance R17；The second of sound pick-up M2 is drawn Foot ground connection.

Preferably, referring to fig. 4, it includes loudspeaker SPK1, loudspeaker SPK2, chip that the second noise reduction module, which includes the second noise reduction module, U2, resistance R13, resistance R14, resistance R15, resistance R16, capacitor C13, capacitor C14, capacitor C15, capacitor C16, capacitor C20, electricity Hold C21, switch SW1A, switch SW1B, switch SW1C and switch SW1D, chip U2 the 1st pin and the one end resistance R13 and open The 12 pins connection of SW1D is closed, the resistance R13 other end connect with the 4th pin of chip U2 and as the first signal input part, core The 4th pin of piece U2 is also connect with the one end resistance R14, and the resistance R14 other end is connect with the one end capacitor C20, the capacitor C20 other end It is connect with the 3rd pin of chip U2；The 5th pin of chip U2 is grounded；It the 11st pin of chip U2 and the one end resistance R15 and opens The 1st pin connection of SW1A is closed, the resistance R15 other end connect with the 9th pin of chip U2 and as second signal input terminal, core The 9th pin of piece U2 is also connect with the one end resistance R16, and the resistance R16 other end is connect with the one end capacitor C21, the capacitor C21 other end It is connect with the 10th pin of chip U2；The 6th pin of chip U2 connects power supply and connects with the one end capacitor C13 and the one end capacitor C14 It connects, the other end of capacitor C13 and capacitor C14 are grounded；The 8th pin of chip U2 connect power supply and with the one end capacitor C15 and electricity Hold the one end C16 to connect, the other end of capacitor C15 and capacitor C16 are grounded；The 9th pin of switch SW1C and the second of chip U2 Pin connection, switch SW1C the 8th pin connection loudspeaker SPK1 cathode, the 7th pin of switch SW1C as monitoring headpone just Pole input signal end；The 10th pin of switch SW1D is grounded, the cathode anode of the 11st pin connection loudspeaker SPK1 of switch SW1D； The 4th pin of switch SW1B is connect with the 12nd pin of chip U2, the cathode of the 5th pin connection loudspeaker SPK2 of switch SW1C, The 6th pin of switch SW1C is as monitoring headpone cathode input signal end；The 3rd pin of switch SW1A is grounded, switch SW1D's 2nd pin connects the cathode anode of loudspeaker SPK2.

Noise reduction module selects JD-ANC662-AN.Second noise reduction module can use loudspeaker to carry out power amplifier, can also insert Enter the sound that monitoring headpone listens to microphone pickup.

The above descriptions are merely preferred embodiments of the present invention, is not intended to limit the utility model, for this For the technical staff in field, various modifications and changes may be made to the present invention.It is all in the spirit and principles of the utility model Within, any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.

Claims (8)

1. a kind of pipeline leak detection instrument, which is characterized in that including host (1), sound pick-up (3), monitoring headpone (4) and active noise reduction mould Block (2), the active noise reduction module (2) include the first noise reduction module (21) and the second noise reduction module (22), first noise reduction Module (21) is connect with the sound pick-up (3) and the host (1) respectively, the second noise reduction module (22) respectively with the monitoring Earphone (4) and the host (1) connection.

2. a kind of pipeline leak detection instrument according to claim 1, which is characterized in that the host (1) include CPU and with The noise treatment module (11) of CPU connection, speech processing module (13), multi-path choice monitor module (12), touch screen (14) and Storage card (15), the sound pick-up (3) are connected to the input terminal of noise treatment module (11), and second noise reduction module (22) is even It is connected to the output end that multi-path choice monitors module (12), multi-path choice monitors the input terminal and noise treatment module of module (12) (11) it is connected with speech processing module (13).

3. a kind of pipeline leak detection instrument according to claim 2, which is characterized in that the noise treatment module (11) include according to The pre-amplification circuit of secondary connection, 50Hz trap circuit, eight rank low-pass filter circuits, high-pass filtering circuit, the amplification of the first rear class Circuit, programmable bandwidth-limited circuit, the second rear class amplifying circuit and digital filtering/spectrum analyzer circuit, the digital filtering/ The output end of spectrum analyzer circuit is connect with CPU, and the first noise reduction module (21) is connected to the input terminal of the pre-amplification circuit, The output end of pre-amplification circuit is also attached to the input terminal that the multi-path choice monitors module (12).

4. a kind of pipeline leak detection instrument according to claim 3, which is characterized in that it includes more that multi-path choice, which monitors module (12), Way switch and power amplifier, the variable connector and the pre-amplification circuit, the second rear class amplifying circuit and speech processes Module (13) is separately connected, and the output end of the power amplifier is connect with second noise reduction module (22).

5. a kind of pipeline leak detection instrument according to claim 2, which is characterized in that the pipeline leak detection instrument further includes microphone (5), the microphone (5) is connected to the input terminal of speech processing module (13).

6. a kind of pipeline leak detection instrument according to claim 3, which is characterized in that the input of the eight ranks low-pass filter circuit End is also connect with the CPU.

7. -6 any a kind of pipeline leak detection instrument according to claim 1, which is characterized in that first noise reduction module (21) Including sound pick-up M1, sound pick-up M2, chip J1, capacitor C5, capacitor C6, capacitor C7, capacitor C8, capacitor C9, capacitor C10, capacitor C11, capacitor C12, capacitor C17, capacitor C18, resistance R5, resistance R6, resistance R7, resistance R8, resistance R9, resistance R10, resistance R11, resistance R12, resistance R17 and resistance R18, the first pin, capacitor C5, resistance R5, resistance R8, the resistance R9, electricity of chip J1 Hold C8 and sound pick-up M1 the first pin serial connection connection, one end of capacitor C7 connect with the connecting pin of resistance R5 and resistance R9 and It is connect with one end of resistance R7, the other end ground connection of capacitor C7, the other end ground connection of resistance R7；Capacitor C9 is in parallel with resistance R9 to be connected It connects；The connecting pin of resistance R9 and resistance R8 is as the first signal output end；One end of capacitor C6 and the first pin of sound pick-up M1 It connects with the connecting pin of capacitor C8 and is connect with one end of resistance R6, the other end ground connection of capacitor C6, another termination of resistance R6 Power supply；The second pin of sound pick-up M1 is grounded；The second pin of chip J1 is grounded；Third pin, the capacitor C10, electricity of chip J1 Hinder the first pin serial connection connection of R10, resistance R12, resistance R18, capacitor C18 and sound pick-up M2, one end of capacitor C11 and electricity The connecting pin of resistance R10 and resistance R12 connects and connect with one end of resistance R11, the other end ground connection of capacitor C11, resistance R11's Other end ground connection；The connecting pin of resistance R12 and resistance R18 is as second signal output end；Capacitor C12 is in parallel with resistance R12 to be connected It connects；One end of capacitor C17 connect with the connecting pin of the first pin of sound pick-up M2 and capacitor C18 and connects with one end of resistance R17 It connects, the other end ground connection of capacitor C17, another termination power of resistance R17；The second pin of sound pick-up M2 is grounded.

8. -6 any a kind of pipeline leak detection instrument according to claim 1, which is characterized in that second noise reduction module (22) Including loudspeaker SPK1, loudspeaker SPK2, chip U2, resistance R13, resistance R14, resistance R15, resistance R16, capacitor C13, capacitor C14, Capacitor C15, capacitor C16, capacitor C20, capacitor C21, switch SW1A, switch SW1B, switch SW1C and switch SW1D, chip U2's 1st pin is connect with 12 pins of the one end resistance R13 and switch SW1D, and the 4th pin of the resistance R13 other end and chip U2 connect It connects and as the first signal input part, the 4th pin of chip U2 is also connect with the one end resistance R14, the resistance R14 other end and capacitor The connection of the one end C20, the capacitor C20 other end are connect with the 3rd pin of chip U2；The 5th pin of chip U2 is grounded；The of chip U2 11 pins are connect with the 1st pin of the one end resistance R15 and switch SW1A, and the 9th pin of the resistance R15 other end and chip U2 connect It connects and as second signal input terminal, the 9th pin of chip U2 is also connect with the one end resistance R16, the resistance R16 other end and capacitor The connection of the one end C21, the capacitor C21 other end are connect with the 10th pin of chip U2；The 6th pin of chip U2 connects power supply and and capacitor The other end of the one end C13 and the connection of the one end capacitor C14, capacitor C13 and capacitor C14 are grounded；The 8th pin of chip U2 connects electricity Source is simultaneously connect with the one end capacitor C15 and the one end capacitor C16, and the other end of capacitor C15 and capacitor C16 are grounded；Switch SW1C The 9th pin connect with the second pin of chip U2, the cathode of the 8th pin of switch SW1C connection loudspeaker SPK1, switch SW1C The 7th pin as monitoring headpone anode input signal end；The 10th pin of switch SW1D is grounded, the 11st pin of switch SW1D Connect the cathode anode of loudspeaker SPK1；The 4th pin of switch SW1B is connect with the 12nd pin of chip U2, and the 5th of switch SW1C the Pin connects the cathode of loudspeaker SPK2, and the 6th pin of switch SW1C is as monitoring headpone cathode input signal end；Switch SW1A's 3rd pin ground connection, the cathode anode of the 2nd pin connection loudspeaker SPK2 of switch SW1D.