CN219435031U - A ability verifying device for domestic appliance product noise test - Google Patents

Abstract

The utility model provides a capability verification device for a noise test of a household appliance product, which comprises a non-destructive and unopened packaging box and a functional circuit packaged in the packaging box, wherein a sound emitting hole is formed in the packaging box, and a power interface is also fixed on the packaging box and connected with the functional circuit, and the functional circuit comprises: the system comprises a singlechip, a power amplifier and a sounding element, wherein the singlechip is used for generating a set frequency signal; the output end of the singlechip is connected with the power amplifier, and the output end of the power amplifier is connected with the sounding element. The utility model can meet the requirements of the household appliance products with different noise frequency bands, such as low, medium and high, for noise test capability verification, and has the advantages of simple structure, low cost, and real and effective test capability of participants.

Description

A ability verifying device for domestic appliance product noise test

Technical Field

The utility model belongs to the technical field of capability verification devices, and particularly relates to a capability verification device for a noise test of a household appliance product.

Background

Regarding noise hazards, industrial noise and traffic noise are often thought of, but noise of home appliances is not inferior to traffic noise and industrial noise, among the noise of home appliances, noise of each frequency band has different degrees of damage to human bodies from low frequency noise to high frequency noise. At present, a plurality of noise laboratories can carry out noise tests on household electrical appliance products, and detect the noise intensity of the products.

At present, the noise test mainly adopts a sound pressure method to measure the sound power level, and the capability verification is carried out by measuring the sound power level of a sound source sample meeting the capability verification of sample consistency (namely uniformity and stability), evaluating the capability of a laboratory to engage in sound level metering and calibration activities and verifying the duration of the capability of the laboratory noise test. The capacity verification device used in the capacity verification plan developed in China is mostly a product which generates middle-low frequency noise, such as a compressor and a purifier.

The disadvantages of the prior art described above:

1. among the noises of the household appliances, the sound recorder and the built-up sound are harmful, the high-frequency noise of the sound recorder and the built-up sound is generally more than 2000 Hz, the high-frequency noise has great damage to the inner ear, and the capability verification device for generating the middle-low-frequency noise is only used, so that the capability of measuring the noises of the household appliances cannot be effectively proved to be completely provided in a laboratory.

2. When a certain actual household electrical appliance product is used as a capability verification sample, the phenomenon of laboratory crosstalk caused by using samples with the same index in the capability verification activity is difficult to prevent, so that the social public confidence of the capability verification activity is reduced.

3. The specific household appliances are used as the capability verification samples, so that the cost is high, and the requirements of the capability verification samples for consistency and low cost in the capability verification activity and large-scale development are difficult to meet.

Disclosure of Invention

Aiming at the defects of the conventional household appliance product noise test capability verification device, the utility model provides a test sample capable of meeting the verification of the household appliance product noise test capability of low, medium and high different noise frequency bands, and the device has the advantages of simple structure and low cost, and can truly and effectively check the test capability of participants.

The utility model aims at realizing the following technical scheme: the utility model provides a capability verification device for domestic appliance product noise test, its characterized in that includes the nondestructive package case and by functional circuit including the encapsulation of package case, be equipped with the sound hole on the package case, still be fixed with simultaneously power interface, power interface with functional circuit links to each other, functional circuit includes:

the system comprises a singlechip, a power amplifier and a sounding element, wherein the singlechip is used for generating a set frequency signal;

the output end of the singlechip is connected with the power amplifier, and the output end of the power amplifier is connected with the sounding element.

The utility model directly generates corresponding frequency signals in a software control mode through the singlechip, can conveniently simulate the output of high, medium and low frequency sound signals, and meets the requirements of the verification of the noise test capability of household electrical appliance products with different noise frequency bands. In addition, the utility model has simple structure, and obviously can greatly save the cost compared with the method which directly uses products such as a compressor, a purifier and the like as a capability verification device. But also can better inhibit the occurrence of crosstalk phenomenon among all participants when the actual household electrical appliance product is directly used as a capability verification sample.

The process of capability verification using the present utility model is generally as follows:

the ability verification organizer distributes the test samples of the ability verification device to each participant, the participants complete the test by using the issued test samples, then the ability verification organizer collects the test data of each participant, and the ability of the participants to perform the corresponding test is evaluated according to the collected data.

The circuit structure of the utility model is packaged by the non-destructive and non-openable packaging box, and the utility model adopts a software control mode to produce frequency signals, which has better confidentiality, so that different participants can not determine whether the difference exists between the test samples on their hands, and the occurrence of the crosstalk phenomenon of different participants can be better avoided, thereby enabling the ability activity to more truly and effectively check the test ability of the participants, and ensuring the social confidence of the ability verification activity.

The packaging box is also fixedly provided with a communication interface which is connected with the singlechip, so that the setting of the singlechip can be changed, and the output frequency of the capability verification device can be readjusted.

The utility model adopts the same interface to complete the power supply function and the communication function, namely the power supply interface and the communication interface are combined into a whole, such as a USB interface and the like.

The power amplifier is provided with a port for adjusting the amplification proportion of the power amplifier, so that the sound power level of the sample is adjustable, and the consistency performance between samples in the same batch is more easily met when the samples are produced.

The packaging box is made of aluminum alloy, and in order to further reduce resonance generated by vibration of the sound-producing element of the metal box, rubber stand feet are arranged on the bottom surface of the packaging box, and damping soundproof cotton is paved on the inner wall of the packaging box.

For the convenience of sound transmission, sound producing holes are formed in the top surface and the periphery of the packaging box, and the overall weight of the capacity verification device is reduced by adopting the measure, so that samples are convenient to carry.

In order to avoid hidden danger of exposure of internal structures caused by more openings on the wall of the box, the utility model also provides a shading screen cloth in the packaging box so as to shade the sight line at the sounding hole.

The singlechip adopts a chip with the model of STC89C52RC.

The sound generating element adopts a passive buzzer.

The functional circuit is integrated on a circuit board which is supported by the support so as to be arranged in the middle of the packaging box, and the sounding opening of the sounding element faces upwards.

The beneficial effects are that:

1) The utility model can conveniently simulate the output of high, medium and low frequency sound signals, thereby meeting the requirements of the household appliance product noise test capability verification of different noise frequency bands, for example, when a passive buzzer is adopted as a sounding element, the sounding frequency range is 100Hz-10000Hz, and the requirements of the household appliance product noise test capability verification of the high, medium and low frequency bands (generally considered as: 20 Hz-500 Hz is low frequency, 500 Hz-2 kHz is medium frequency, 2 kHz-16 kHz is high frequency);

2) Compared with the method that products such as a compressor and a purifier are directly used as a capacity verification device, the utility model has the advantages of simple structure and low cost;

3) Compared with the method that products such as a compressor and a purifier are directly used as the capability verification device, the method can also avoid collusion among different participants, so that the capability activity can be more truly and effectively examined on the testing capability of the participants, and the social public trust of the capability verification activity is ensured.

Drawings

FIG. 1 is a schematic block diagram of a test sample of the capability verification device of the present utility model;

FIG. 2 is a schematic circuit diagram of a test sample of the capability verification device of the present utility model;

fig. 3 and 4 are schematic structural diagrams of test samples of the capability verification device of the present utility model.

Detailed Description

Fig. 1 shows a functional block diagram of a specific embodiment of the capability verification apparatus of the present utility model. The illustrated test sample comprises a singlechip, a power amplifier connected with the output end of the singlechip, and a sounding element connected with the output end of the power amplifier. The test sample was powered by a power adapter. The trigger switch is connected with the singlechip, and the singlechip outputs an electric signal at a set frequency by pressing the trigger switch, and the power amplifier at the rear stage controls the sounding volume of the sounding element. The sounding volume is determined after the amplification proportion of the amplifier is regulated according to the requirement of the test sample, and the output power of the amplifier is locked after the determination and is not changed generally. The acoustic power level error of different test samples should be controlled within +/-0.3 dB to meet the requirement of the consistency of the same batch of capacity verification devices, so that the amplification ratio of the amplifier is adjustable, and the requirement is more easily met.

The power adapter of the test sample converts alternating current input into direct current output, the input end is connected with 220V alternating current, and the output end is connected with a singlechip and the like packaged in a packaging box through a universal serial bus interface fixed on the packaging box of the test sample. The power adapter uses an active voltage stabilizing element inside, and the output is constant 5V,2A even if the input voltage fluctuates. The USB interface is recommended to be adopted, and data transmission can be performed while power supply is completed.

Fig. 2 shows a specific circuit of the above test sample, which is integrated on a circuit board. The test sample specifically adopts a singlechip U1 as a sounding chip, and the model of the test sample is STC89C52RC. The chip is a low-power consumption high-performance CMOS 8-bit microcontroller, has an 8K in-system programmable Flash memory, has the function of power-down protection, and is low in cost. U2 is a power amplifier whose amplification ratio is adjustable by an adjustable resistor PV 1. LS1 is the sound generating element, adopts passive buzzer, and it relies on square wave drive sound production, and sound production frequency range is 100Hz-10000Hz, can be used to simulate household electrical appliances high, well, the noise of low frequency, more laminating test product demand.

FIGS. 3 and 4 show the mounting structure of the test sample. The packaging box 1 is used for packaging the functional circuits inside, and has the characteristic of non-destructive and non-openable, so that the functional circuits of the test sample have good confidentiality. The packaging box 1 is made of aluminum alloy, and is fixedly provided with a USB interface 11 and a trigger button 12. In order to further reduce resonance of the metal box body caused by vibration of the sound generating element, rubber stand feet 13 are arranged on the bottom surface of the packaging box, and damping soundproof cotton 14 is paved on the inner wall. The top surface and the periphery of the packaging box 1 are provided with sounding holes 15 for the convenience of sound transmission. The measure can reduce the total weight of the sample at the same time, and is convenient for carrying the sample. In order to eliminate hidden dangers of exposed internal structures caused by more openings on the wall of the box, the utility model also arranges a shading screen cloth (not shown) inside the packaging box 1 so as to shade the sight line at the sounding hole 15. Reference numeral 16 denotes an arch-shaped frame which is fixed to the bottom surface of the package 1 and is used for supporting the circuit board so that the sound generating element is positioned at the geometric center of the package 1 with the sound generating opening facing upward.

As the sound source generator in the ability verification activity, the test sample controls the frequency and amplitude of sound in a way of recording a program by the singlechip, can conveniently simulate the output of high, medium and low frequency sound signals, and can more conveniently meet the requirements on the consistency and confidentiality of the sound source generator.

The test sample also has the advantages of simple structure, low cost and convenience for large-scale implementation of the capability verification plan.

Claims (10)

1. The utility model provides a capability verification device for domestic appliance product noise test, its characterized in that includes the nondestructive package case and by functional circuit including the encapsulation of package case, be equipped with the sound hole on the package case, still be fixed with simultaneously power interface, power interface with functional circuit links to each other, functional circuit includes:

the system comprises a singlechip, a power amplifier and a sounding element, wherein the singlechip is used for generating a set frequency signal;

the output end of the singlechip is connected with the power amplifier, and the output end of the power amplifier is connected with the sounding element.

2. The capability verification device of claim 1, wherein a communication interface is further fixed to the packaging box, and the communication interface is connected to the single-chip microcomputer.

3. The capability verification device according to claim 2, wherein the capability verification device employs the same interface to perform both a power supply function and a communication function, i.e., the power interface and the communication interface are integrated.

4. A capability verification device as claimed in claim 3, wherein said capability verification device employs a USB interface for power and communication functions.

5. The capability verification apparatus of claim 1 wherein said power amplifier is provided with a port for adjusting its amplification ratio.

6. The capacity verification device as claimed in claim 1, wherein the packaging box is made of aluminum alloy, rubber stand legs are arranged on the bottom surface, and damping soundproof cotton is paved on the inner wall.

7. The capability verification device of claim 1, wherein sound emitting holes are formed in the top surface and the periphery of the package.

8. The capability verification device of claim 3, wherein a shade screen is disposed inside the enclosure to block a line of sight at the sound emitting aperture.

9. The capability verification device of claim 1, wherein the single-chip microcomputer is a chip with a model number of STC89C52RC, and the sound generating element is a passive buzzer.

10. The capability verification apparatus of claim 1 wherein said functional circuit is integrated on a circuit board supported by a bracket so as to be disposed in a middle portion of said enclosure with sound emitting openings of sound emitting elements facing upward.