CN210893568U - Noise monitor - Google Patents
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- CN210893568U CN210893568U CN201921890591.9U CN201921890591U CN210893568U CN 210893568 U CN210893568 U CN 210893568U CN 201921890591 U CN201921890591 U CN 201921890591U CN 210893568 U CN210893568 U CN 210893568U
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Abstract
The utility model relates to the technical field of pipeline leakage detection, in particular to a noise monitor, which comprises a lower flange, a strong magnetic base, a circuit board and a noise collector; the noise collector comprises a mass block, and is provided with a containing groove and a screw mounting hole; the piezoelectric ceramic piece is arranged inside the accommodating groove and is provided with an assembling hole; the isolation sleeve is sleeved with the assembly hole; the screw is connected with the mass block and the piezoelectric ceramic piece in a matched manner through the screw mounting hole and the isolation sleeve; the top of the lower flange is provided with a butt-joint column matched with the screw and the isolation sleeve for use, the bottom of the lower flange is provided with a connecting hole matched with the strong magnetic base for installation, and the butt-joint column is matched with the mass block to compress the upper surface and the lower surface of the piezoelectric ceramic plate. The noise monitor can realize automatic, effective and accurate acquisition of pipeline noise signals through parts such as a noise collector, a circuit board, a strong magnetic base and a lower flange, and improves the acquisition convenience of the pipeline noise signals.
Description
Technical Field
The utility model relates to a pipeline leakage detects technical field, specifically is a noise monitoring appearance.
Background
The reduction of the leakage rate of the water supply network has huge economic benefits, environmental benefits and social benefits, and has great significance to both the civilian life and the environmental protection, so the method is also a cause of the national strong support and strict requirement improvement. Common devices currently used for leak detection are physical and electronic listening devices. These leak hunting equipment of two kinds all need the staff to carry equipment to the scene and listen and examine, and need the staff to listen and examine when pipeline discharge is lower night, can't accomplish unmanned on duty and long-term monitoring, and it is extremely inconvenient to use. Therefore, how to realize automatic monitoring of pipeline leakage is an urgent problem to be solved, and the key point for realizing automatic monitoring is how to automatically, effectively and accurately acquire the noise signal of the pipeline.
SUMMERY OF THE UTILITY MODEL
The utility model discloses to the problem that prior art exists, provide a noise monitoring appearance that can automatic, effective, accurate acquisition pipeline noise signal.
The utility model provides a technical scheme that its technical problem adopted is: a noise monitor comprises a lower flange, a strong magnetic base, a circuit board and a noise collector; the noise collector comprises
The mass block is provided with a containing groove and a screw mounting hole;
the piezoelectric ceramic piece is arranged inside the accommodating groove and is provided with an assembling hole;
the isolation sleeve is sleeved with the assembly hole;
the screw is connected with the mass block and the piezoelectric ceramic piece in a matched manner through the screw mounting hole and the isolation sleeve;
the top of the lower flange is provided with a butt column matched with the screw and the isolation sleeve for use, the bottom of the lower flange is provided with a connecting hole matched with the strong magnetic base for installation, and the butt column is matched with the mass block to tightly press the upper surface and the lower surface of the piezoelectric ceramic plate;
the circuit board comprises
The signal acquisition circuit is used for converting the noise charge signal acquired by the noise collector into a noise voltage signal;
the singlechip is used for converting the noise voltage signal into a noise audio signal;
and the Flash memory is used for storing the noise audio signal.
Preferably, the number of the piezoelectric ceramic plates is two.
Preferably, the lower flange is provided with a circle of sealing groove for accommodating the sealing ring, and the sealing groove is matched with the shell for use.
Preferably, the butt-joint column is provided with a screw butt-joint groove and a spacer bush butt-joint groove.
Preferably, the noise collector further comprises a power supply connected with the circuit board and the noise collector.
Preferably, the signal acquisition circuit comprises a charge amplification circuit, a secondary amplification circuit, a normalization circuit, a low-pass filter circuit and a high-pass filter circuit;
the charge amplification circuit comprises a 6B amplifier, wherein a port 6 of the 6B amplifier is connected with one end of a 24 th capacitor, the other end of the 24 th capacitor is connected with a port 2 of a connector, a port 1 of the connector is connected with the anode of a 1 st diode, the cathode of the 1 st diode is connected with the anode of a 2 nd diode, the cathode of the 2 nd diode and the anode of the 1 st diode are both grounded, and the anode of the 2 nd diode is also connected with the port 2 of the connector; the port 5 of the 6B amplifier is respectively connected with one end of a 26 th capacitor and one end of a 24 th resistor, the other end of the 26 th capacitor is grounded, and the other end of the 24 th resistor is connected with a reference voltage; the port 7 of the 6B amplifier is respectively connected with one end of a 20 th capacitor and one end of a 14 th resistor, the other end of the 20 th capacitor is respectively connected with one end of an 18 th resistor and the port 6 of the 6B amplifier, the other end of the 18 th resistor is respectively connected with one end of a 17 th resistor and the other end of the 14 th resistor, and the other end of the 17 th resistor is connected with a reference voltage.
Preferably, the second-stage amplifying circuit comprises a 6A amplifier, the port 3 of the 6A amplifier is connected with one end of a 25 th capacitor, the other end of the 25 th capacitor is connected with one end of a 22 nd resistor, and the other end of the 22 nd resistor is connected with the port 7 of the 6B amplifier; the port 2 of the 6A amplifier is connected with one end of a 19 th resistor, the other end of the 19 th resistor is connected with a 21 st capacitor, and the other end of the 21 st capacitor is grounded; the port 1 of the 6A amplifier is respectively connected with one end of a 23 rd capacitor and one end of a 20 th resistor, and the other end of the 23 rd capacitor and the other end of the 20 th resistor are both connected with the port 2 of the 6A amplifier; port 4 of the 6A amplifier is grounded; and the port 8 of the 6A amplifier is connected with a 3.3V power supply.
Preferably, the normalization circuit comprises a 7A comparator, a port 3 of the 7A comparator is connected with one end of a 21 st resistor, and the other end of the 21 st resistor is connected with a port 1 of the 6A amplifier; the port 2 of the 7A comparator is connected with one end of a 15 th resistor, the other end of the 15 th resistor is connected with one end of an 18 th capacitor, and the other end of the 18 th capacitor is grounded; the port 1 of the 7A comparator is respectively connected with one end of a 19 th capacitor and one end of a 16 th resistor, and the other end of the 19 th capacitor and the other end of the 16 th resistor are both connected with the port 2 of the 7A comparator; port 4 of the 7A comparator is grounded; and the port 11 of the 7A comparator is connected with a 3.3V power supply.
Preferably, the low-pass filter circuit includes a 7B comparator, a port 5 of the 7B comparator is respectively connected to one end of a 30 th resistor, one end of a 31 th capacitor, and one end of a 32 th resistor, the other end of the 31 th capacitor is grounded, and the other end of the 32 th resistor is connected to a reference voltage; a port 6 of the 7B comparator is connected with one end of a 25 th resistor, the other ends of the 25 th resistor and the 30 th resistor are both connected with one end of a 28 th capacitor, and the other end of the 28 th capacitor is connected with a port 1 of the 7A comparator; a port 7 of the 7B comparator is respectively connected with one end of a 30 th capacitor, one end of a 29 th capacitor and one end of a 26 th resistor, and the other end of the 26 th resistor and the other end of the 29 th capacitor are both connected with a port 6 of the 7B comparator; port 4 of the 7B comparator is grounded; and the port 11 of the 7B comparator is connected with a 3.3V power supply.
Preferably, the high-pass filter circuit comprises a 7C comparator and a 7D comparator;
the port 9 of the 7C comparator is connected with one end of a 28 th resistor, and the other end of the 28 th resistor is connected with the other end of the 30 th capacitor; the port 10 of the 7C comparator is connected with one end of a 33 th resistor, and the other end of the 33 th resistor is connected with a reference voltage; a port 8 of the 7C comparator is respectively connected with one end of a 31 th resistor, one end of a 27 th resistor and one end of a 27 th capacitor, and the other end of the 27 th resistor and the other end of the 27 th capacitor are both connected with a port 9 of the 7C comparator; port 4 of the 7C comparator is grounded; a port 11 of the 7C comparator is connected with a 3.3V power supply; the other end of the 31 st resistor is connected with a second signal output end;
the port 13 of the 7D comparator is connected with one end of a 37 th resistor, and the other end of the 37 th resistor is connected with the other end of the 30 th capacitor; the port 12 of the 7D comparator is connected with one end of a 41 th resistor, and the other end of the 41 th resistor is connected with a reference voltage; a port 14 of the 7D comparator is respectively connected with one end of a 38 th resistor, one end of a 34 th resistor and one end of a 32 th capacitor, and the other end of the 34 th resistor and the other end of the 32 th capacitor are both connected with a port 13 of the 7D comparator; port 4 of the 7D comparator is grounded; a port 11 of the 7D comparator is connected with a 3.3V power supply; the other end of the 38 th resistor is connected with a first signal output end.
The utility model has the advantages that the noise monitor can realize the automatic, effective and accurate collection of the pipeline noise signals through the noise collector, the circuit board, the strong magnetic base, the lower flange and other parts, thereby improving the collection convenience of the pipeline noise signals; and the noise monitor of this application uses extremely conveniently.
Drawings
FIG. 1 is a cross-sectional view of a noise monitor according to the present application;
FIG. 2 is a schematic external view of the noise monitor of FIG. 1;
FIG. 3 is a schematic diagram of the internal structure of the noise monitor of FIG. 1;
FIG. 4 is an assembly view of the noise collector, the lower flange and the ferromagnetic base;
FIG. 5 is a schematic view of the interior of the noise collector and the ferromagnetic base;
FIG. 6 is a schematic structural view of the lower flange;
FIG. 7 is a schematic diagram of a charge amplification circuit;
FIG. 8 is a schematic diagram of a two-stage amplification circuit;
FIG. 9 is a schematic diagram of a normalization circuit;
FIG. 10 is a schematic diagram of a low pass filter circuit;
FIG. 11 is a schematic diagram of a high pass filter circuit.
Detailed Description
The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.
As shown in fig. 1 to 6, the noise monitor comprises a lower flange 2, a strong magnetic base 7, a circuit board 8 and a noise collector.
Wherein, noise collector locates including the quality piece 3 that is equipped with storage tank and mounting screw hole the inside piezoceramics piece 4 that just is equipped with the pilot hole of storage tank, with the spacer sleeve 5 that the pilot hole cup jointed, through mounting screw hole and spacer sleeve 5 with the screw 6 that quality piece 3 and piezoceramics piece 4 cooperation are connected.
The top of the lower flange 2 is provided with a butt joint column 21, the bottom of the lower flange is provided with a connecting hole matched with the strong magnetic base 7, the top of the butt joint column 21 is provided with a screw butt joint groove matched with a screw 6 for use and an isolation sleeve butt joint groove matched with an isolation sleeve 5 for use, and the butt joint column 21 is matched with the mass block 3 to compress the upper surface and the lower surface of the piezoelectric ceramic piece 4.
Can directly install noise monitoring appearance in the arbitrary suitable position of pipeline through strong magnetism base 7, only need during the installation with noise monitoring appearance put on the pipeline can, it is very simple and convenient to use, wait to monitor that pipeline interval 100 meters can place a noise monitoring appearance.
The principle of the noise collector for collecting noise is that the vibration of the pipeline can bring an inertia force to the mass block, the piezoelectric ceramic piece 4 can generate charges after the inertia force is applied, the larger the inertia force is (namely, the larger the noise vibration is), the larger the charges generated by the piezoelectric ceramic piece 4 are, and the noise collector converts the vibration signal of the pipeline into a noise charge signal.
The function of the spacer sleeve 5 is to separate the piezoelectric ceramic plate 4 from the screw 6 for fixing the piezoelectric ceramic plate 4 and preventing short circuit thereof. The number of the piezoelectric ceramic pieces 4 is two, and the noise collector with the structure has the highest cost performance on the premise of ensuring excellent performance.
The noise collector with the structure can effectively and accurately collect the noise signals of the pipeline.
The circuit board 8 and the noise collector can be powered by a power supply 9.
The circuit board 8 includes a signal acquisition circuit for converting a noise charge signal acquired by the noise acquirer into a noise voltage signal, a single chip for converting the noise voltage signal into a noise audio signal, and a Flash memory for storing the noise audio signal.
As shown in fig. 7 to 11, the noise collector is connected to the circuit board 8, and converts the noise charge signal into a noise voltage signal through a signal collecting circuit of the circuit board. The signal acquisition circuit comprises a charge amplification circuit, a secondary amplification circuit, a normalization circuit, a low-pass filter circuit and a high-pass filter circuit.
The charge amplification circuit comprises a 6B amplifier, wherein a port 6 of the 6B amplifier is connected with one end of a 24 th capacitor, the other end of the 24 th capacitor is connected with a port 2 of a connector, a port 1 of the connector is connected with the anode of a 1 st diode, the cathode of the 1 st diode is connected with the anode of a 2 nd diode, the cathode of the 2 nd diode and the anode of the 1 st diode are both grounded, and the anode of the 2 nd diode is also connected with the port 2 of the connector; the port 5 of the 6B amplifier is respectively connected with one end of a 26 th capacitor and one end of a 24 th resistor, the other end of the 26 th capacitor is grounded, and the other end of the 24 th resistor is connected with a reference voltage; the port 7 of the 6B amplifier is respectively connected with one end of a 20 th capacitor and one end of a 14 th resistor, the other end of the 20 th capacitor is respectively connected with one end of an 18 th resistor and the port 6 of the 6B amplifier, the other end of the 18 th resistor is respectively connected with one end of a 17 th resistor and the other end of the 14 th resistor, and the other end of the 17 th resistor is connected with a reference voltage.
The second-stage amplification circuit comprises a 6A amplifier, wherein a port 3 of the 6A amplifier is connected with one end of a 25 th capacitor, the other end of the 25 th capacitor is connected with one end of a 22 nd resistor, and the other end of the 22 nd resistor is connected with a port 7 of a 6B amplifier; the port 2 of the 6A amplifier is connected with one end of a 19 th resistor, the other end of the 19 th resistor is connected with a 21 st capacitor, and the other end of the 21 st capacitor is grounded; the port 1 of the 6A amplifier is respectively connected with one end of a 23 rd capacitor and one end of a 20 th resistor, and the other end of the 23 rd capacitor and the other end of the 20 th resistor are both connected with the port 2 of the 6A amplifier; port 4 of the 6A amplifier is grounded; and the port 8 of the 6A amplifier is connected with a 3.3V power supply.
The normalization circuit comprises a 7A comparator, wherein a port 3 of the 7A comparator is connected with one end of a 21 st resistor, and the other end of the 21 st resistor is connected with a port 1 of the 6A amplifier; the port 2 of the 7A comparator is connected with one end of a 15 th resistor, the other end of the 15 th resistor is connected with one end of an 18 th capacitor, and the other end of the 18 th capacitor is grounded; the port 1 of the 7A comparator is respectively connected with one end of a 19 th capacitor and one end of a 16 th resistor, and the other end of the 19 th capacitor and the other end of the 16 th resistor are both connected with the port 2 of the 7A comparator; port 4 of the 7A comparator is grounded; and the port 11 of the 7A comparator is connected with a 3.3V power supply.
The low-pass filter circuit comprises a 7B comparator, wherein a port 5 of the 7B comparator is respectively connected with one end of a 30 th resistor, one end of a 31 st capacitor and one end of a 32 nd resistor, the other end of the 31 st capacitor is grounded, and the other end of the 32 nd resistor is connected with a reference voltage; a port 6 of the 7B comparator is connected with one end of a 25 th resistor, the other ends of the 25 th resistor and the 30 th resistor are both connected with one end of a 28 th capacitor, and the other end of the 28 th capacitor is connected with a port 1 of the 7A comparator; a port 7 of the 7B comparator is respectively connected with one end of a 30 th capacitor, one end of a 29 th capacitor and one end of a 26 th resistor, and the other end of the 26 th resistor and the other end of the 29 th capacitor are both connected with a port 6 of the 7B comparator; port 4 of the 7B comparator is grounded; and the port 11 of the 7B comparator is connected with a 3.3V power supply.
The high pass filter circuit includes a 7C comparator and a 7D comparator. The port 9 of the 7C comparator is connected with one end of a 28 th resistor, and the other end of the 28 th resistor is connected with the other end of the 30 th capacitor; the port 10 of the 7C comparator is connected with one end of a 33 th resistor, and the other end of the 33 th resistor is connected with a reference voltage; a port 8 of the 7C comparator is respectively connected with one end of a 31 th resistor, one end of a 27 th resistor and one end of a 27 th capacitor, and the other end of the 27 th resistor and the other end of the 27 th capacitor are both connected with a port 9 of the 7C comparator; port 4 of the 7C comparator is grounded; a port 11 of the 7C comparator is connected with a 3.3V power supply; the other end of the 31 st resistor is connected with the second signal output end. The port 13 of the 7D comparator is connected with one end of a 37 th resistor, and the other end of the 37 th resistor is connected with the other end of the 30 th capacitor; the port 12 of the 7D comparator is connected with one end of a 41 th resistor, and the other end of the 41 th resistor is connected with a reference voltage; a port 14 of the 7D comparator is respectively connected with one end of a 38 th resistor, one end of a 34 th resistor and one end of a 32 th capacitor, and the other end of the 34 th resistor and the other end of the 32 th capacitor are both connected with a port 13 of the 7D comparator; port 4 of the 7D comparator is grounded; a port 11 of the 7D comparator is connected with a 3.3V power supply; the other end of the 38 th resistor is connected with a first signal output end.
The noise charge signal sequentially passes through the charge amplifying circuit, the secondary amplifying circuit, the normalizing circuit, the low-pass filter circuit and the high-pass filter circuit to obtain a required noise voltage signal.
The noise voltage signal is converted into a noise audio signal through the singlechip and is stored in a Flash memory. The single chip microcomputer can be MSP430FR6972, and comprises a digital-to-analog converter inside. The application does not limit the type of the Flash memory, and the Flash memory can be any suitable Flash memory.
The noise monitor of this application can regularly gather noise signal, for example, 2 points gather a section pipeline noise signal that reaches 5 seconds in the morning, 3 points gather a section pipeline noise signal that reaches 5 seconds in the morning, 4 points gather a section pipeline noise signal that reaches 5 seconds in the morning.
Noise signals collected by the noise monitor can be stored in a Flash memory, when the noise monitor needs to be analyzed, the noise monitor can be recovered for analysis, collected noise audio signals can be directly transmitted to a terminal for analysis (the specific transmission technology adopts the prior art), the condition that workers monitor pipelines at night can be avoided, and the convenience of pipeline noise monitoring is improved.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the spirit and scope of the present invention. Without departing from the design concept of the present invention, various modifications and improvements made by the technical solution of the present invention by those skilled in the art should fall into the protection scope of the present invention, and the technical contents claimed by the present invention have been fully recorded in the claims.
Claims (10)
1. A noise monitor, characterized by: comprises a lower flange (2), a strong magnetic base (7), a circuit board (8) and a noise collector; the noise collector comprises
The mass block (3) is provided with a containing groove and a screw mounting hole;
the piezoelectric ceramic piece (4) is arranged in the accommodating groove and is provided with an assembling hole;
the isolation sleeve (5) is sleeved with the assembly hole;
the screw (6) is connected with the mass block (3) and the piezoelectric ceramic piece (4) in a matching way through the screw mounting hole and the isolation sleeve (5);
the top of the lower flange (2) is provided with a butt column (21) which is matched with the screw (6) and the isolation sleeve (5) for use, the bottom of the lower flange is provided with a connecting hole which is matched with the strong magnetic base (7) for installation, and the butt column (21) is matched with the mass block (3) to press the upper surface and the lower surface of the piezoelectric ceramic plate (4) tightly;
the circuit board (8) comprises
The signal acquisition circuit is used for converting the noise charge signal acquired by the noise collector into a noise voltage signal;
the singlechip is used for converting the noise voltage signal into a noise audio signal;
and the Flash memory is used for storing the noise audio signal.
2. A noise monitor according to claim 1, wherein: the number of the piezoelectric ceramic pieces (4) is two.
3. A noise monitor according to claim 1, wherein: the lower flange (2) is provided with a circle of sealing groove (22) for accommodating the sealing ring, and the sealing groove (22) is matched with the shell (1) for use.
4. A noise monitor according to claim 1, wherein: the butt joint column (21) is provided with a screw butt joint groove and an isolation sleeve butt joint groove.
5. A noise monitor according to claim 1, wherein: and the noise collector also comprises a power supply (9) connected with the circuit board (8) and the noise collector.
6. A noise monitor according to claim 1, wherein: the signal acquisition circuit comprises a charge amplification circuit, a secondary amplification circuit, a normalization circuit, a low-pass filter circuit and a high-pass filter circuit;
the charge amplification circuit comprises a 6B amplifier, wherein a port 6 of the 6B amplifier is connected with one end of a 24 th capacitor, the other end of the 24 th capacitor is connected with a port 2 of a connector, a port 1 of the connector is connected with the anode of a 1 st diode, the cathode of the 1 st diode is connected with the anode of a 2 nd diode, the cathode of the 2 nd diode and the anode of the 1 st diode are both grounded, and the anode of the 2 nd diode is also connected with the port 2 of the connector; the port 5 of the 6B amplifier is respectively connected with one end of a 26 th capacitor and one end of a 24 th resistor, the other end of the 26 th capacitor is grounded, and the other end of the 24 th resistor is connected with a reference voltage; the port 7 of the 6B amplifier is respectively connected with one end of a 20 th capacitor and one end of a 14 th resistor, the other end of the 20 th capacitor is respectively connected with one end of an 18 th resistor and the port 6 of the 6B amplifier, the other end of the 18 th resistor is respectively connected with one end of a 17 th resistor and the other end of the 14 th resistor, and the other end of the 17 th resistor is connected with a reference voltage.
7. The noise monitor according to claim 6, wherein: the second-stage amplification circuit comprises a 6A amplifier, wherein a port 3 of the 6A amplifier is connected with one end of a 25 th capacitor, the other end of the 25 th capacitor is connected with one end of a 22 nd resistor, and the other end of the 22 nd resistor is connected with a port 7 of a 6B amplifier; the port 2 of the 6A amplifier is connected with one end of a 19 th resistor, the other end of the 19 th resistor is connected with a 21 st capacitor, and the other end of the 21 st capacitor is grounded; the port 1 of the 6A amplifier is respectively connected with one end of a 23 rd capacitor and one end of a 20 th resistor, and the other end of the 23 rd capacitor and the other end of the 20 th resistor are both connected with the port 2 of the 6A amplifier; port 4 of the 6A amplifier is grounded; and the port 8 of the 6A amplifier is connected with a 3.3V power supply.
8. The noise monitor according to claim 7, wherein: the normalization circuit comprises a 7A comparator, wherein a port 3 of the 7A comparator is connected with one end of a 21 st resistor, and the other end of the 21 st resistor is connected with a port 1 of the 6A amplifier; the port 2 of the 7A comparator is connected with one end of a 15 th resistor, the other end of the 15 th resistor is connected with one end of an 18 th capacitor, and the other end of the 18 th capacitor is grounded; the port 1 of the 7A comparator is respectively connected with one end of a 19 th capacitor and one end of a 16 th resistor, and the other end of the 19 th capacitor and the other end of the 16 th resistor are both connected with the port 2 of the 7A comparator; port 4 of the 7A comparator is grounded; and the port 11 of the 7A comparator is connected with a 3.3V power supply.
9. A noise monitor according to claim 8, wherein: the low-pass filter circuit comprises a 7B comparator, wherein a port 5 of the 7B comparator is respectively connected with one end of a 30 th resistor, one end of a 31 st capacitor and one end of a 32 nd resistor, the other end of the 31 st capacitor is grounded, and the other end of the 32 nd resistor is connected with a reference voltage; a port 6 of the 7B comparator is connected with one end of a 25 th resistor, the other ends of the 25 th resistor and the 30 th resistor are both connected with one end of a 28 th capacitor, and the other end of the 28 th capacitor is connected with a port 1 of the 7A comparator; a port 7 of the 7B comparator is respectively connected with one end of a 30 th capacitor, one end of a 29 th capacitor and one end of a 26 th resistor, and the other end of the 26 th resistor and the other end of the 29 th capacitor are both connected with a port 6 of the 7B comparator; port 4 of the 7B comparator is grounded; and the port 11 of the 7B comparator is connected with a 3.3V power supply.
10. A noise monitor according to claim 9, wherein: the high-pass filter circuit comprises a 7C comparator and a 7D comparator;
the port 9 of the 7C comparator is connected with one end of a 28 th resistor, and the other end of the 28 th resistor is connected with the other end of the 30 th capacitor; the port 10 of the 7C comparator is connected with one end of a 33 th resistor, and the other end of the 33 th resistor is connected with a reference voltage; a port 8 of the 7C comparator is respectively connected with one end of a 31 th resistor, one end of a 27 th resistor and one end of a 27 th capacitor, and the other end of the 27 th resistor and the other end of the 27 th capacitor are both connected with a port 9 of the 7C comparator; port 4 of the 7C comparator is grounded; a port 11 of the 7C comparator is connected with a 3.3V power supply; the other end of the 31 st resistor is connected with a second signal output end;
the port 13 of the 7D comparator is connected with one end of a 37 th resistor, and the other end of the 37 th resistor is connected with the other end of the 30 th capacitor; the port 12 of the 7D comparator is connected with one end of a 41 th resistor, and the other end of the 41 th resistor is connected with a reference voltage; a port 14 of the 7D comparator is respectively connected with one end of a 38 th resistor, one end of a 34 th resistor and one end of a 32 th capacitor, and the other end of the 34 th resistor and the other end of the 32 th capacitor are both connected with a port 13 of the 7D comparator; port 4 of the 7D comparator is grounded; a port 11 of the 7D comparator is connected with a 3.3V power supply; the other end of the 38 th resistor is connected with a first signal output end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921890591.9U CN210893568U (en) | 2019-11-05 | 2019-11-05 | Noise monitor |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921890591.9U CN210893568U (en) | 2019-11-05 | 2019-11-05 | Noise monitor |
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| CN210893568U true CN210893568U (en) | 2020-06-30 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865687A (en) * | 2021-08-31 | 2021-12-31 | 青岛海尔空调器有限总公司 | Pipeline vibration testing device |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113865687A (en) * | 2021-08-31 | 2021-12-31 | 青岛海尔空调器有限总公司 | Pipeline vibration testing device |
| CN113865687B (en) * | 2021-08-31 | 2024-02-20 | 青岛海尔空调器有限总公司 | Pipeline vibration testing device |
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