CN109764955B

CN109764955B - Method for detecting water inlet noise of toilet water tank by effective sensing noise level pulse measurement method

Info

Publication number: CN109764955B
Application number: CN201810481870.3A
Authority: CN
Inventors: 李文杰; 王博; 王敬; 郝秋伟; 李丽华
Original assignee: Individual
Current assignee: Individual
Priority date: 2018-05-18
Filing date: 2018-05-18
Publication date: 2021-02-12
Anticipated expiration: 2038-05-18
Also published as: CN109764955A

Abstract

The invention relates to a method for detecting the water inlet noise of a toilet water tank, which comprises the following steps: installing and debugging a sample; determining a sound source reference body, a parallelepiped and a hemisphere measuring surface; judging impulse noise; sound pressure level measurement; calculating the level of effective perceived noise and correcting background noise and test environment; and (6) evaluating the results. It is characterized in that: calculating pulse noise index to judge water inlet noise pulse, and applying sound level meter A to weight pulse sound level time weight characteristic to measure surface of parallelepiped or hemisphere with effective sensing noise level L_EPNAnd (4) accurately and quantitatively detecting the characterized water inlet noise. The invention provides for measuring the maximum sound pressure level L 'of weighted pulse A of the noise of water intake on a surface of a parallelepiped or hemisphere'_pAi(ST)(max)The measurement is carried out to calculate the effective perceived noise level L of the water in a specific water replenishing period_EPNAnd provides the basis for evaluating the results. The invention fills the blank in the technical field of the detection of the water inlet noise of the toilet water tank, and can provide a detection technical support for improving the product quality and standardizing the market order.

Description

Method for detecting water inlet noise of toilet water tank by effective sensing noise level pulse measurement method

Technical Field

The invention relates to a noise quantitative test method, in particular to a method for measuring the effective sensing noise level L on a parallelepiped or hemisphere measuring surface by applying the A weighting pulse sound level time weighting characteristic I of a sound level meter_EPNA method for detecting water inlet noise of a water inlet valve of a toilet water tank belongs to the technical field of physical and chemical performance detection of toilet water tank accessories.

Background

In recent years, toilets serve as basic civilian problems and important civilized windows, the construction quality of the toilets cannot be ignored, and along with the increasing of the use amount of the toilet and water tank accessories in important civilian fields such as catering, traveling, home and the like and the enhancement of people health and environmental awareness, the monitoring and control of the water inlet noise of the toilet water tank are increasingly concerned by various social circles.

The water inlet valve is used as a core part of a toilet cistern accessory, and the water inlet noise of the water inlet valve accounts for a higher weight in the toilet flushing noise, and directly influences and determines the magnitude level of the flushing noise. The noise generated in the toilet flushing process belongs to the category of hydrodynamic noise and is mainly composed of structural vibration noise of a pipeline, fluid noise of water and cavitation noise; the fluid noise is an important source of flushing noise and mainly comprises noise of water flowing in a water ring and on the inner wall of the toilet bowl, noise of water rotating in the toilet bowl and noise of broken siphons and water replenishing of a water inlet valve in the later stage of pollution discharge; therefore, the flushing noise is not only closely related to the internal structure of the toilet bowl, but also largely influenced by the water inlet noise of the water inlet valve of the toilet tank. The noise has all characteristics of sound wave propagation, wherein the propagation characteristic closely related to the water inlet noise test of the water inlet valve is the directivity of the sound wave, so that the measuring point distribution needs to be reasonably arranged during actual measurement.

In order to strictly control the quality of the water tank accessory products, 2011 national distribution enforces the mandatory standard GB 26730-. However, the technical requirements of the method for detecting the water inlet noise of the water inlet valve in the standard 7.5-item noise test are extremely simple, and in a test chamber with the environmental noise of not higher than 30dB (A), the water inlet valve is arranged on a standard water tank with the height of 400mm from the ground without adding a water tank cover; a sound level meter with the precision of not less than 0.1d B (A) is arranged, and a detection head of the sound level meter is 1m away from the front surface of the water tank and is 1m higher than the ground; adjusting the inlet water dynamic pressure to 0.3MPa, opening the inlet valve, starting measurement after 10s, recording the highest noise value of the whole inlet water process, repeating the operation for three times, and reporting the arithmetic average value. The acoustic principle of a sound source reference body, a measurement surface and the like is not involved, and key technical contents of a corresponding result calculation formula, data reduction, measurement uncertainty and the like are also lacked; the detection operation of the water inlet noise of the water inlet valve is lack of scientificity and normalization, and the result data is not comparable and repeatable and is difficult to play a role in guiding and supporting the improvement of product quality and the specification of market order. Through investigation, due to the deficiency of related testing technologies, the product quality is difficult to quantitatively verify. The lack of detection methods limits the further development of the industry to a certain extent.

At present, sanitary products are listed in the key field of quality improvement, the standard system of detection methods of sanitary ceramics and matched products thereof is perfected, and the research and development of a water inlet noise detection technology of a water inlet valve of a toilet water tank are trending. Therefore, in order to promote the quality of related products to be improved and to fill up the short toilet boards which affect the quality of life of the masses, the supporting function of the patent technology on the standard research needs to be strengthened; the invention has a certain practical significance for helping the industry transformation and upgrade of toilet water tank accessories in China.

Disclosure of Invention

The technical problem to be solved by the invention is to provide an A-weighted pulse sound level time weighting characteristic 'I' applying a sound level meter to effectively sense the noise level L on a parallelepiped or hemisphere measuring surface_EPNThe method for detecting the water inlet noise of the water inlet valve of the toilet water tank can solve the problems of water inlet noise of the water inlet valve and accurate and quantitative test of water inlet/drainage noise of bathroom ceramics such as a face washer and a toilet.

In order to solve the technical problems, the invention adopts the technical scheme that:

a method for detecting water inlet noise of a water inlet valve of a toilet water tank comprises the following steps: (1) installing and debugging a sample; (2) determining a sound source reference body, a parallelepiped and a hemisphere measuring surface; (3) judging impulse noise; (4) measuring sound pressure level; (5) calculating the level of effective perceived noise, correcting background noise and testing environment; (6) evaluating the detection result; the method is characterized in that the pulse property of the inlet water noise of the inlet valve of the toilet water tank is judged by calculating the pulse noise index; a-weighted pulse level time weighting characteristic "I" pair using a level meter to effectively sense the level of noise L_EPNThe water inlet noise of sign carries out accurate quantitative determination, and is specific:

in impulse noise determination:

according to GB/T3768-Measuring the sound power level of a noise source by an acoustic sound pressure method, and selecting four representative acoustic measurement points based on the directivity characteristic of water inlet noise after positioning a water inlet valve sample of a toilet tank to be measured by adopting the relevant specification of appendix D in the simple method for enveloping a measurement surface above a reflecting surface; under the conditions of a specific water replenishing period and set test dynamic pressure, respectively applying the A weighted pulse sound level time weighting characteristic 'I' and the A weighted equivalent sound level slow time weighting characteristic 'S' of the sound level meter to time-averaged pulse maximum sound pressure level L 'of the water inflow noise at the coordinates of each measuring point'_{pAIi(ST)(max)}And a cumulative percent time average sound pressure level L'_pAi(ST)(50)Carrying out measurement; the measurement is carried out 5 times in succession at each measuring point coordinate, and the corresponding impulse noise index Δ L 'is calculated'_{pAIi(ST)(max)}－L′_pAi(ST)(50)When the average value is more than or equal to 3dB, the water inlet noise of the water inlet valve sample to be detected can be judged to be pulse noise;

in sound pressure level measurement:

according to the relevant regulations in GB/T3768-2017, the positioning of the sound source reference body under different reflection plane conditions is determined and the characteristic dimension d of the sound source is calculated according to the sample installation requirement of the water inlet valve of the toilet water tank₀(ii) a And simultaneously selecting a parallelepiped or hemispherical measuring surface corresponding to the water inlet noise source reference body of the water inlet valve, determining the size of the measuring surface, and determining the coordinates of the position arrays of the sound transmitters on the different measuring surfaces. In a semi-anechoic chamber or a reverberation chamber, a specific water replenishing period of a water inlet valve of a water tank of a toilet is taken as integral time of audio signal acquisition, and the accumulated percentage time average sound pressure level L of background noise on the measuring surface of a selected parallelepiped or hemisphere is measured by using a slow time weighting characteristic S of A weighting equivalent sound level of a sound level meter_pAi(B)(50). Then, under the test dynamic pressure condition of 0.30MPa +/-0.05 MPa, aiming at different water supplement amount (half-flush or full-flush) test requirements of a toilet water tank, an A weighted pulse sound level time weighted characteristic 'I' of a sound level meter is applied, and the time average pulse maximum sound pressure level L 'of water inlet valve water inlet noise on the selected parallel hexahedron or hemisphere measuring surface is determined'_{pAIi(ST)(max)}；

In the effective perceived noise level calculation:

according to related concepts and calculation formulas in GB/T3768-2017, under the test dynamic pressure condition of 0.30MPa +/-0.05 MPa, a water replenishing period specific to a water inlet valve of a toilet water tank is taken as the integration time of audio signal acquisition, and the time-average pulse maximum sound pressure level L 'of water inlet noise measured by the weighting characteristic I of the weighting A pulse sound level time of a sound level meter and the weighting characteristic S of the weighting A slow time of the equivalent sound level is applied'_{pAIi(ST)(max)}And the cumulative percentage of background noise time-averaged sound pressure level L_pAi(B)(50)Calculating the average value of A weighted time average sound pressure level corresponding to the microphone array on the selected parallelepiped or hemispherical measuring surface as the basic data

And

and correcting value K for background noise_1ATesting the environmental correction value K_2AThe effective sensing noise level L of the water inlet noise of each toilet cistern water inlet valve sample under the specific dynamic pressure condition is deduced_EPNAnd the mean of the effective perceived noise level of the water ingress noise for each set of samples

Simultaneously, defining corresponding data reduction requirements and measurement uncertainty ranges;

in the evaluation of the results:

effective perceived noise level L when a sample is intake of water_EPNEffective perceived noise level L for water ingress noise for 3 samples greater than this set_EPNArithmetic mean value

At 10%, re-extracting a group of samples to repeat the experiment; and calculating the effective sensing noise level L of the water inlet noise measured by a parallelepiped or hemisphere measuring surface method by using the A weighting pulse sound level time weighting characteristic I of the sound level meter under the specific dynamic pressure condition of the front and the rear groups of water inlet valve samples of the toilet water tank_EPNIs an arithmetic mean value of

Effective perceived noise level L if water ingress noise for a sample_EPNEffective perceived noise level L of water ingress noise greater than the two sets of 6 samples_EPNArithmetic mean value

10% of the total weight is discarded; effective perceived noise level L of intake noise for residual intake valve sample_EPNIs arithmetic mean of

The water inlet noise is used as the evaluation index of the water inlet noise of the water inlet valve sample of the toilet water tank.

Compared with the prior art, the invention adopting the technical scheme has the beneficial effects that:

(1) the advancement is as follows: in the acoustic environment of a semi-anechoic chamber or a reverberation chamber, a modern precision instrument, namely a sound level meter, is applied to measure the water inlet noise of a parallelepiped or hemispherical measuring surface and correct the background noise. Considering that the water replenishing mode of the water inlet valve is started in a transient process, the effective sensing noise level L capable of correctly reflecting the remarkable influence of the water inlet noise on the psychology and physiology of people is adopted_EPNAs subjective evaluation parameters; the detection technology has certain advancement, achieves the modernization of the water inlet noise detection of the water inlet valve of the toilet water tank, and lays a necessary hardware foundation for realizing the precision of the detection result.

(2) Scientifically: on the basis of following the acoustic general guide rule in GB/T3768-2017, aiming at a water inlet noise generation mechanism and a propagation path of a water inlet valve based on the non-continuous characteristic of noise caused by liquid non-steady flow, establishing acoustic models of the measuring surfaces of a parallelepiped and a hemisphere according to an envelope sound source test principle on the basis of judging the pulse property of the water inlet valve; comprehensively analyzes the influence of factors such as background noise, environmental conditions and the like, and uses the civil building water supply pipe worker general as the effective sensing noise level L of the impulse noise in the water inlet process measured under the pressure test condition_EPNAs the related evaluation meansThe detection method meets the actual use state of toilet water tank accessories and the attention focus of consumers, and improves the scientificity of the detection method.

(3) Standardization: evaluating the test result according to the national environmental protection requirement and the product quality standard, and referring to the corresponding regulations in the national acoustic basic standard GB/T3768-charge 2017 for the technical requirements on instruments, sound source reference bodies, measurement surfaces, calculation formulas and the like; the method provides a structure diagram of the applicable reference body, the applicable parallelepiped and hemispherical measuring surfaces, simultaneously defines key technical contents such as sample installation, pulse qualitative determination, measuring point coordinates, measuring steps, a calculation formula, uncertainty, result evaluation and the like, and can realize the quantification of the inlet noise detection result of the water inlet valve of the toilet water tank.

(4) Prospective: the method is based on the directivity characteristic that the inlet water noise of the inlet valve of the toilet water tank is strong, and on the basis of referring to the guidance rule of the related acoustic principle in GB/T3768-plus 2017, the coordinate setting of the measuring point is innovated, microphone position arrays under different reflecting noodle conditions are enriched and completed, and the accuracy grade of the measuring result can be ensured to be not lower than 3 grade. In addition, because the water inlet noise is mixed noise containing impulse noise and steady-state noise, the impulse property of the water inlet noise of different water inlet valve samples is scientifically judged by calculating impulse noise indexes, and the noise level L is effectively sensed_EPNAs the representation, the performance evaluation index is more scientific and humanized, so the technology has certain prospect.

(5) The accuracy is as follows: a sound level meter with high automation degree and advanced and mature technology is used as test equipment, and the evaluation results of three toilet cistern inlet valve samples are used as final judgment conclusions; selecting A weighted pulse sound level time weighted characteristic I of an applied sound level meter in a specific water replenishing period to measure the pulse maximum sound pressure level L 'of the water inlet noise on the surface of the parallelepiped or hemisphere'_{pAIi(ST)(max)}Carrying out accurate quantitative determination; influence factors such as background noise, test environment and the like are corrected through a calculation formula, the accumulative effect of uncertainty in the measurement process is comprehensively judged, and measurement errors can be effectively avoided.

(6) The innovation is as follows: for water supplyInfluence of pressure on water inlet noise of water inlet valve of toilet cistern, selecting effective impulse noise level L of sensed noise in water inlet process measured by parallelepiped or hemisphere measuring surface method in specific water charging period (half-flushing or full-flushing) according to general working pressure range of water supply pipeline between floors of civil building and noise test requirement under different water charging amount conditions_EPNAs a performance evaluation index, the method can determine the installation conditions of the test water tank and the technical requirements of the water tank fittings, and can effectively fill the blank in the technical field of related acoustic tests at home and abroad at present.

(7) Operability: the sound level price is cheap, the application is extensive, the sample installation, debugging and a series of experimental operations stipulated by the method of the invention are simple and easy to do; the technical contents of the aspects of test parameters, pulse qualitative, measurement surface, measurement point array, test steps, calculation formula, data processing, evaluation standard and the like are clearly and specifically described, and the description of the relevant chart is visual and accurate, so that the method is easy to understand and master, the patent implementation process has strong operability, and the transfer and the popularization and the application of the achievements are facilitated.

(8) Universality: based on the advantages, the method has stronger practicability and is favorable for expanding the popularization and application in inspection, study, research and production fields; the device is beneficial to realizing universality of a detection technology for supporting the water inlet noise of a water tank water inlet valve of a toilet, and can provide reference for the washing noise of a ceramic toilet, a squatting pan and a urinal, the noise generated in the using process of other sanitary ceramics such as a face washer, a bidet and the like, water supply and drainage pipelines and the like, and the detection technology research thereof.

Further, the preferred scheme of the invention is as follows:

the sample installation and debugging are carried out according to the following steps:

(1) taking 3 water inlet valve samples of toilet tank fittings of the same type, specification and size produced by the same manufacturer and the same batch as a group, wherein the use mode can be side pressing or top pressing (single-flushing type or double-flushing type);

(2) the standard water tank meeting the technical requirements of national standard GB 26730-: 400mm × 175mm × 300 mm; the relative water level of each component of a standard water tank or a flushing water tank (not comprising a hidden water tank) after being installed meets the requirement of item 5.4.1, and the relative water level of each component of the hidden water tank after being installed meets the requirement of item 5.4.10.2;

(3) installing a water inlet valve sample inside a test water tank according to the use instruction of a production plant, and for a water inlet valve provided with a water supplementing device, firmly fixing a water supplementing pipe on the water inlet valve and marking a rated water supplementing ratio, wherein the water supplementing quantity can meet the water seal recovery requirement of a toilet; according to the regulations of 5.2.3, 5.2.4 and 5.2.8 in GB 26730-; after static pressure and dynamic pressure tightness tests, the rising degree of the water level of the water tank is not more than 8mm, and no visible drip leakage exists after the water inlet valve is closed; when the water is drained to a specified height, the water inlet valve can be automatically opened, the water can be automatically closed after the water is fed to a working water level, and the height difference of the working water level of the water fed for 5 times is not more than 5 mm;

(4) when the toilet bowl matched with the water tank provided with the water inlet valve sample to be tested is not installed close to any wall, if the test is carried out in the acoustic environment similar to the free field above the reflecting surface of the semi-anechoic chamber, the test water tank can be directly placed in the center of the ground through the supporting frame without adding a water tank cover; the height of the bottom of the water tank from the indoor ground is 450mm, and the normal flushing function is ensured. If the test is carried out in a rigid wall test chamber or a special reverberation chamber, the test water tank can be placed on the ground through the supporting rack without adding a water tank cover; the height from the bottom of the water tank to the indoor ground is 450mm, and the distance between the water tank and any wall in the room is not less than 1.0 m; meanwhile, the normal flushing function is ensured;

(5) when the toilet bowl matched with the water tank provided with the water inlet valve sample to be tested is installed close to a wall, the test can be carried out in a rigid wall surface test chamber or a special reverberation chamber, the test water tank is directly placed on the ground through the supporting rack, and a water tank cover is not added; the height from the bottom of the water tank to the indoor ground is 450mm, the distance between the back of the water tank and the wall against which the water tank leans is 15cm +/-5 cm, and the distance between the water tank and the other three indoor walls is not less than 1.5 m; meanwhile, the normal flushing function is ensured;

(6) when the pedestal pan matched with the water tank provided with the water inlet valve sample to be tested is installed by a corner, the pedestal pan can be tested in a rigid wall test chamber or a special reverberation chamber, the test water tank is directly placed on the ground through the support frame, and a water tank cover is not added; the height from the bottom of the water tank to the indoor ground is 450mm, the distance between the back and the side of the water tank and the wall is 15cm +/-5 cm, and the distance between the water tank and the other two indoor walls is not less than 1.5 m; and meanwhile, the normal flushing function is ensured.

The determination of the sound source reference body, the parallelepiped and the hemisphere measuring surface is carried out according to the following steps:

(1) determination of the shape and the size of the water inlet noise source reference body of the water inlet valve: setting the position and the size of a sound source reference body by using a three-dimensional coordinate system according to the relevant regulations of item 7.1 in GB/T3768-2017 simple method for measuring the sound power level and the sound energy level of a noise source by using an envelope measuring surface above a reflecting surface; the center of a box body formed by a sound source reference body and mirror images of the sound source reference body on adjacent reflecting planes is used as a coordinate origin O, and horizontal axes x and y are respectively parallel to the length and the width of the reference body. Length l of sound source reference body using horizontal width of test water tank₁And the width l taking the horizontal length of the test water tank as the sound source reference body₂And the height l taking the vertical distance between the working water level line of the test water tank and the ground as a sound source reference body₃. Characteristic dimension d of sound source reference body corresponding to different test environment conditions₀Are respectively [ (l)₁/2)²+(l₂/2)²+l₃ ²]^1/2(a reflection plane), [ l [ ]₁ ²+(l₂/2)²+l₃ ²]^1/2(two reflection planes) and [ l₁ ²+l₂ ²+l₃ ²]^1/2(III)A reflection plane) in meters (m);

(2) determination of the parallelepiped measuring surface and its microphone position array: according to the relevant specification of 7.2.4 items in the standard GB/T3768-2017, the used parallelepiped measuring surface and the sound source reference body have the same azimuth coordinate origin and appearance shape, namely an imaginary parallelepiped with the area of S, enveloping the water inlet noise source of the water inlet valve to be measured, and the sides of which are parallel to the sides of the reference body and the distance of d from the reference body, wherein d is more than or equal to 1.0 m. If the test water tank is not close to any wall when being installed, the position coordinates (x, y, z) of the 1 st to 9 th microphones are respectively (a,0,0.5c), (0, b,0.5c), (-a, 0,0.5c), (0, -b,0.5c), (a, b, c), (-a, -b, c), (a, -b, c), and (0,0, c). Area S ═ 4(ab + bc + ca), where a ═ 0.5l₁+d，b＝0.5l₂+d，c＝l₃+d；l₁、l₂、l₃The length, width and height of the sound source reference body are respectively, and the unit is meter (m); d is 1.0 m. If the test water tank is installed close to the wall, the position coordinates (x, y, z) of the 1 st to 4 th microphones are (2a,0,0.5c), (a, b,0.5c), (a, -b,0.5c) and (a,0, c), respectively. Area S ═ 2(2ab + bc +2ca), where a ═ 0.5l₁+0.5d，b＝0.5l₂+d，c＝l₃+d；l₁、l₂、 l₃The length (from the wall to the front end face), the width and the height of the sound source reference body are respectively, and the unit is meter (m); d is 1.0 m. If the test water tank is arranged close to a wall corner, the 1 st to 3 rd microphone position coordinates (x, y, z) are (2a, -b,0.5c), (a, -2b,0.5c), (a, -b, c) respectively. Area S ═ 2(2ab + bc + ca), where a ═ 0.5l₁+0.5d，b＝0.5l₂+0.5d， c＝l₃+d；l₁、l₂、l₃Length, width and height of the acoustic reference body (length and width of the reference body, i.e. the distance from two walls to the opposite face of the corresponding reference body), respectively, in meters (m); d is 1.0 m.

(3) Determination of hemispherical measurement surfaces and their microphone position arrays: according to the provisions of item 7.2.3 of GB/T3768-Measuring a semispherical surface with radius r, wherein r is more than or equal to 2d₀And r is more than or equal to 16.0m and more than or equal to 1.0 m. If the test water tank is not close to any wall when being installed, the measuring surface is a complete hemisphere and the area S is 2 pi r²R is 2.0 m; the coordinates of the microphone positions are shown in table 1 (in view of the strong directivity of toilet bowl flushing noise, additional microphone positions are added if the sound pressure level variation range measured at the four basic microphone positions of 4, 5, 6 and 10 exceeds 8 dB; the coordinates are the points numbered 14, 15, 16 and 20 in table 1). If the test tank is mounted against a wall, the measurement surface is an 1/2 hemisphere with an area S ═ π r²R is 3.0 m; the microphone position coordinates are shown in table 2. If the test tank is mounted against a corner, the measurement surface is an 1/4 hemisphere with an area S ═ π r ²2, r is 3.0 m; the microphone position coordinates are shown in table 3.

TABLE 1 hemispherical measurement surface microphone position coordinates of water inlet valve samples on a reflection plane

TABLE 2 1/2 hemispherical measurement surface microphone position coordinates with inlet valve samples located on two reflection planes

Location numbering	x/r	y/r	z/r
				14	0.45	-0.77	0.45
15	0.45	0.77	0.45
				18	0.66	0	0.75

TABLE 3 1/4 hemispherical measurement surface microphone position coordinates with intake valve samples located on three reflection planes

Location numbering	x/r	y/r	z/r
				14	0.45	-0.77	0.45
21	0.77	-0.45	0.45
				22	0.47	-0.47	0.75

The impulse noise judgment is carried out according to the following steps:

(1) in the acoustic environment of a semi-anechoic chamber, a test water tank is directly placed in the center of the ground in a test chamber through a support frame without adding a water tank cover; the height from the bottom of the test water tank to the ground is 450mm, so that the normal flushing function is ensured; taking the middle point of the distance between a water inlet valve and a drain valve overflow pipe in a test water tank as a reference, and respectively selecting four coordinate points which are 1.0m above the middle point, 1.0m in front of the middle point and 1.0m in front of the middle point as acoustic measurement points at the height of 1.0m away from the middle point (the two measurement points in front of the left and the right are respectively positioned at the positions 0.7m respectively on the left and the right of the measurement point in front of the middle point);

(2) adjusting the dynamic pressure of the test to 0.30MPa +/-0.05 MPa, emptying water in the test water tank according to the water replenishing requirement to be detected, starting timing 10s after water is re-fed until a water inlet valve is naturally closed, and taking the timing as the sound level meter audio signal acquisition integration time; if the water replenishing period (half flushing or full flushing) of the sample of the water inlet valve to be tested is less than 20s, the integration time is counted by 10 s. Time average pulse maximum sound pressure level L 'of water inflow noise at coordinates of each measuring point by respectively applying A weight pulse sound level time weight characteristic' I 'and A weight equivalent sound level slow time weight characteristic' S 'of sound level meter'_{pAIi(ST)(max)}And a cumulative percent time-averaged sound pressure level L'_pAi(ST)(50)Measuring for 5 times continuously at each measuring point coordinate and recording;

(3) calculating a corresponding impulse noise index delta L 'by using the measured sound pressure level values of the points'_{pAIi(ST)(max)}－L′ _pAi(ST)(50)And average value thereof, ifThe average value of delta is not less than 3dB, and the water inlet noise to be detected can be judged to be pulse noise;

the sound pressure level measurement is carried out according to the following steps:

(1) except that 1 test water tank for assembling a water inlet valve sample to be tested and necessary test devices such as a supporting rack and a tripod are reserved, all other articles in the test chamber are removed, and no redundant personnel can be present in the test chamber; the experimental operator must not wear clothing with significant sound absorption characteristics;

(2) measuring test water tank size l with steel ruler and square₁、l₂、l₃Recording, determining the space positioning of the sound source reference body and calculating the characteristic dimension d thereof according to the number of the reflection planes involved in the installation mode of the matched toilet₀(ii) a Selecting an appropriate parallelepiped or hemispherical envelope sound source measurement surface and calculating a specific dimension a, b, c or a measurement radius r thereof; calculating and recording the coordinates of the measuring points according to the position array of the selected measuring surface microphone;

(3) the sound level meter used for measurement should have time-weighted pulse gear 'I' and A-weighted equivalent sound level gear 'L' at the same time_Aeq"and meets the requirement of a 1-type instrument in GB/T3785.1-2010, and the verification period does not exceed 2 years; the filter meets the requirements of a type 1 instrument in IEC 61260:1995, and the calibration period does not exceed 1 year. Before the test is started and after the test is finished, verifying the test on one or more frequencies in the measuring frequency range of the sound level meter by using a sound calibrator meeting the requirement of the level 1 accuracy in GB/T15173; the difference of the readings is not more than 0.5 dB;

(4) the test chamber can be a semi-anechoic chamber or a reverberation chamber, so that the available indoor space volume meets the installation requirements of the test water tank and the support frame thereof, corresponding water supply/drainage conditions are provided, and the dynamic pressure of test water can be regulated and controlled; wherein, the background noise in the semi-anechoic chamber is not more than 16dB (A), the acoustic condition of approximate free field above the reflecting surface can be provided, and the verification period is not more than 5 years; background noise in the reverberation room is not more than 25dB (A), and reverberation time is in the range of 5 s-6 s;

(5) positioning coordinates of each measuring point according to a microphone position array of the selected parallelepiped or hemispherical measuring surface; simultaneously moving the tripod to a measuring point position and placing a sound level meter with related acoustic performance on a top cloud platform of the tripod to ensure that the orientation of the microphone is the same as the sound wave incident angle when the microphone is calibrated and the microphone vertically points to a measuring surface;

(6) starting timing 10s after the water inlet valve is opened until the water inlet valve is naturally closed, and taking the timing as the integral time of sound level meter audio signal acquisition; if the water replenishing period (half flushing or full flushing) of the sample of the water inlet valve to be tested is less than 20s, the integration time is counted by 10 s. Determination of cumulative percent time-averaged sound pressure level L of background noise on selected paralleled hexahedral or hemispherical measurement surfaces using the A-weighted equivalent level of the sound level meter slow time-weighted characteristic "S" of the sound level meter_pAi(B)(50)The measurements were taken 3 times in succession at each microphone location, and the arithmetic mean was taken as the sound pressure level measurement of the background noise at that location and recorded. If the difference of the sound pressure levels measured 3 times at each position is greater than 0.5dB, re-measuring and recording;

(7) adjusting the dynamic pressure of the test to 0.30MPa +/-0.05 MPa, emptying water in the test water tank according to the water replenishing requirement to be detected, starting timing 10s after water is re-fed until a water inlet valve is naturally closed, and taking the timing as the integral time of sound level meter sound frequency signal acquisition; if the water replenishing period (half flushing or full flushing) of the sample of the water inlet valve to be tested is less than 30s, the integral time is counted by 30 s. Determination of the time-averaged pulse maximum sound pressure level L 'of the water inlet noise of a water intake valve on a selected parallelepiped or hemispherical measuring surface using the A-weighted pulse sound level time-weighted characteristic "I" of the sound level meter'_{pAIi(ST)(max)}And recording; simultaneously recording the dynamic pressure, the water supplement amount and the water supplement period of each water inflow;

the effective perceived noise level calculation is performed according to the following steps:

(1) selecting a calculation formula: with reference to relevant regulations in GB/T3768-:

if Δ L_pAIIf the noise is more than 10dB, the background noise correction is not needed; if 10dB >. DELTA.L_pAIAnd if the value is more than or equal to 3dB, correcting according to the formula (7).

K_1A＝-10lg(1-10^-0.1△LpAI))………………………………………………………………(7)

K_2A＝l0lg(l+4S/A)……………………………………………………………(8)

When K is_2AWhen the power is less than or equal to 7dB, the measurement made according to the method is effective; wherein, the calculation formulas of the sound absorption amounts of the half anechoic chamber and the reverberation chamber are respectively as follows:

A＝α·S_ν………………………………………………………………………(9)

A＝0.16V/T_n…………………………………………………………………(10)

in the formula:

-the mean value of the time-averaged maximum sound pressure level of the pulse of the ingress noise measured on the parallelepiped or hemispherical measuring surface, in decibels (dB);

L′_{pAIi(ST)(max)}-the time-averaged maximum pulse pressure level in decibels (dB) of the ingress noise measured at the ith microphone position on the parallelepiped or hemispherical measurement surface;

n is the position number of the parallelepiped or hemisphere measuring surface microphone;

-the cumulative percentage time average sound pressure level mean of the background noise measured on a parallelepiped or hemispherical measuring surface, in decibels (dB);

L_pAi(B)(50)-the cumulative percentage time average sound pressure level in decibels (dB) of the background noise measured at the ith microphone position on the parallelepiped or hemispherical measurement surface;

K_1A-a background noise correction value;

K_2A-testing the environmental correction value;

s-area of a parallelepiped or hemisphere measuring surface in square meters (m)²)；

A-equivalent sound absorption area in square meters (m) of room at 1kHz frequency in test chamber²)；

alpha-A weighted average sound absorption coefficient of the surface of the test room, and the numerical range is shown in the table A.1 in GB/T3768-2017;

S_νtotal area of the test Room boundary (wall, floor, ceiling) in square meters (m)²)；

V-test Room volume in cubic meters (m)³)；

T_n-measured a weight or frequency band reverberation time in seconds(s);

the time average pulse maximum sound pressure level of the inlet noise of the inlet valve of the toilet water tank measured by the parallelepiped or hemispherical measuring surface method is measured in decibels (dB);

L_EPNthe effective perceived noise level of the inlet water noise, measured by a parallelepiped or hemispherical measuring surface method, of each toilet cistern inlet valve is in decibels (dB);

T_d-a water inlet valve sample specific refill cycle for a toilet cistern water tank in seconds(s);

-the average of the effective perceived noise level in decibels (dB) for the ingress noise for each set of inlet valve samples;

L_EPN1、L_EPN2、L_EPN3-effective perceived noise level in decibels (dB) of inlet noise for each set of inlet valve samples;

(2) data reduction requirements: intake noise A weight time-averaged pulse maximum sound pressure level L'_{pAIi(ST)(max)}Weighted cumulative percentage time average sound pressure level L with background noise A_pAi(B)(50)The measurement result retains a significant digit after decimal point, and the mean value of the time average sound pressure level

And effective perceived noise level L_EPNTaking an integer as a calculation result;

(3) measurement uncertainty: the method stipulates the repeatability standard deviation sigma of the measurement result of the water inlet noise A weighting time average pulse maximum sound pressure level of the water inlet valve of the toilet water tank on the measuring surface of a parallelepiped or a hemisphere_omcThe upper limit value is not greater than 1.5 dB. Referring to the relevant contents in GB/T3768-2017 standard, in a complete water replenishing period, the same experimenter uses the same sound level meter to select the same water inlet valve sample of the toilet water tank at the same installation positionAverage value of maximum sound pressure level of A weighted time average pulse on same parallelepiped or hemisphere measuring surface

6 replicate measurements were made (for each replicate the inlet valve sample had to be reinstalled and repositioned) and the measurement was corrected for background noise. Standard deviation of repeatability σ_omcThe calculation formula of (2) is as follows:

in the formula:

the average value of the A weighted time average maximum pulse average sound pressure level on the parallel hexahedron or hemisphere measuring surface after j times of repeated measurement of the water inlet noise of the water inlet valve of the toilet cistern and correction of background noise;

-arithmetic mean sound pressure level calculated from all repeated measurements.

The result evaluation calculation is carried out according to the following steps:

(1) according to the national environmental protection standard and the standard requirements of related products, the following grading judgment standards are adopted:

the noise of water inlet is very low, and the environmental protection performance is excellent;

the noise of water inlet is low, and the environmental protection performance is good;

the water inlet noise is low, and the environmental protection performance is good;

the noise of water inlet is slightly higher, and the environmental protection performance is slightly poor;

the water inlet noise is high, and the environmental protection performance is poor;

the noise of water inlet is very high, and the environmental protection performance is poor.

(2) And (3) judging the water inlet noise evaluation result of each group of toilet cistern inlet valve samples: under the test dynamic pressure condition of 0.30MPa +/-0.05 MPa, the A weighting pulse sound level time weighting characteristic I of a sound level meter is used for testing the water inlet noise of a water inlet valve sample of a toilet water tank in a specific water replenishing period (half-flushing or full-flushing) by a parallelepiped or hemisphere measuring surface method; effective perceived noise level L when a sample is intake of water_EPNEffective perceived noise level L of water ingress noise for 3 samples greater than this set_EPNArithmetic mean value

When 10%, a group of samples need to be extracted again to repeat the experiment; calculating the effective sensing noise level L of the water inlet noise measured by a parallelepiped or hemisphere measuring surface method by using the A weighted pulse sound level time weighting characteristic I of the sound level meter under the condition of specific dynamic pressure of the front and the rear groups of water inlet valve samples_EPNIs an arithmetic mean value of

Effective perceived noise level L if water ingress noise of a sample_EPNEffective perceived noise level L greater than the water ingress noise of the two 6 samples_EPNArithmetic mean value

10% of the total weight is discarded; effective sensing noise level L of intake noise of residual intake valve sample_EPNIs arithmetic mean of

As the water inlet noise evaluation index of the water inlet valve sample of the toilet water tank.

Drawings

FIG. 1 is a schematic illustration of the relative water levels of the various components within the flush tank;

in the figure: 38mm is more than or equal to h₁≥10mm，h₂≥25mm，h₃≥5mm，h₄≥5mm，h₅≤20mm；

FIG. 2 is a schematic diagram showing the relative water levels of the components inside the concealed water tank;

in the figure: h is₁≥15mm，h₂≥25mm，h₃≥5mm，h₄≥5mm，h₅≤20mm；

FIG. 3 is a schematic illustration of a noise source reference for inlet water samples from toilet tank inlet valves on a reflective surface according to the present invention;

in the figure: d₀-the characteristic size of the sound source, m; l₁-length of reference body, m; l₂-width of the reference body, m; l₃-height of the reference body, m; o-origin of coordinates;

FIG. 4 is a schematic diagram of a noise source reference for inlet water of a toilet tank inlet valve sample on two reflecting planes in the present invention;

FIG. 5 is a schematic illustration of a noise source reference for inlet water to a sample toilet tank inlet valve on three reflection planes in accordance with the present invention;

in the figure: d₀-the characteristic size of the sound source, m; l₁-length of reference body, m; l₂-width of the reference body, m; l₃Of a reference bodyHeight, m; o-origin of coordinates;

FIG. 6 is a schematic view of a parallelepiped measuring surface of a toilet tank inlet valve sample inlet noise source on a reflecting plane and its microphone position array according to the present invention;

in the figure: ● — microphone position; a-a reflecting surface; b-a reference body; 2 a-measuring surface length, m; 2 b-measuring the surface width m; c-measuring surface height, m; d-measuring distance, m; l₁-reference body length, m; l₂-reference body width, m; l₃-height of reference body, m;

FIG. 7 is a schematic view of a parallelepiped measuring surface of a toilet tank inlet valve sample inlet noise source on two reflecting planes and its microphone position array in accordance with the present invention;

in the figure: ● — microphone position; b-a reference body; 2 a-measuring surface length, m; 2 b-measuring the surface width, m; c-measuring surface height, m; d-measuring distance, m; l₁-reference body length, m; l₂-reference body width, m; l₃-height of reference body, m;

FIG. 8 is a schematic view of a parallelepiped measuring surface of a toilet tank inlet valve sample inlet noise source on three reflecting planes and its microphone position array in accordance with the present invention;

FIG. 9 is a schematic view of a hemispherical measurement surface of a toilet tank inlet valve sample inlet noise source on a reflection plane and its microphone position array of the present invention;

in the figure: good-basic microphone position; ● — additional microphone location; a-a measurement surface; b-a reference body; r-measuring the surface radius;

FIG. 10 is a schematic representation of an 1/2 hemispherical measuring surface and its microphone location array of a toilet tank inlet valve sample inlet noise source on two reflecting planes in accordance with the present invention;

in the figure: ● — microphone position; r-measuring the surface radius;

FIG. 11 is a schematic representation of an 1/4 hemispherical measuring surface and its microphone location array of a toilet tank inlet valve sample inlet noise source on three reflection planes in accordance with the present invention;

in the figure: ● — microphone position; r-measuring the surface radius;

Detailed Description

The invention is described in detail below with reference to the drawings and preferred embodiments so that the advantages and features of the invention can be more easily understood by those skilled in the art, and the scope of the invention is more clearly and clearly defined.

In the embodiment, water inlet valve samples with the use modes of top pressing and double flushing and the nominal water supplement amounts of 6L and 3L respectively are arranged in a flushing water tank matched with a toilet; the detection of the noise of the water inlet under the condition of the full water replenishing quantity is taken as an example for explanation.

The specific detection method comprises the following steps:

(1) sample installation and commissioning

1.1 sample number, Specification

The water inlet valve samples in 3 toilet tank fittings of the same type, specification and size produced by the same manufacturer and the same batch are used as a group, and the use mode can be side pressing or top pressing (single-flushing type or double-flushing type).

1.2 sample mounting

The standard water tank meeting the technical requirements of national standard GB 26730-: 400mm × 175mm × 300 mm; the relative water level of each component of a standard water tank or a flushing water tank (not comprising a concealed water tank) after being installed meets the requirement of item 5.4.1, and the relative water level of each component of the concealed water tank after being installed meets the requirement of item 5.4.10.2.

1.3 sample Conditioning

A water inlet valve sample is installed inside a test water tank according to the use instructions of a production plant, for a water inlet valve provided with a water replenishing device, a water replenishing pipe is firmly fixed on the water inlet valve, the rated water replenishing ratio is marked, and the water replenishing quantity can meet the requirement of water seal recovery of a toilet. According to the regulations of No. 5.2.3, No. 5.2.4 and No. 5.2.8 in GB 26730-; after static pressure and dynamic pressure tightness tests, the rising height of the water level of the water tank is not more than 8mm, and no visible drip leakage exists after the water inlet valve is closed; when the water is drained to a specified height, the water inlet valve can be automatically opened, the water can be automatically closed after the water is fed to a working water level, and the height difference of the working water level of the continuous 5-time water feeding is not more than 5 mm. The relative water levels of the flush tank (not including the concealed tank) after the components are installed should meet the requirements of figure 1, and the relative water levels of the concealed tank after the components are installed should meet the requirements of figure 2.

1.4 sample positioning

1.4.1 when the toilet bowl matched with the water tank provided with the water inlet valve sample to be tested is not installed close to any wall, if the test is carried out in the acoustic environment similar to the free field above the reflecting surface of the semi-anechoic chamber, the test water tank can be directly placed in the center of the ground through the supporting frame without adding a water tank cover; the height of the bottom of the water tank from the indoor ground is 450mm, and the normal flushing function is ensured. If the test is carried out in a rigid wall test chamber or a special reverberation chamber, the test water tank can be placed on the ground through the supporting rack without adding a water tank cover; the height from the bottom of the water tank to the indoor ground is 450mm, and the distance between the water tank and any wall in the room is not less than 1.0 m; while ensuring proper flushing function.

1.4.2 when the toilet bowl matched with the water tank provided with the inlet valve sample to be tested is installed against a wall, the toilet bowl can be tested in a rigid wall surface test chamber or a special reverberation chamber, and the test water tank is directly placed on the ground through the support frame without adding a water tank cover; the height from the bottom of the water tank to the indoor ground is 450mm, the distance between the back of the water tank and the wall against which the water tank leans is 15cm +/-5 cm, and the distance between the water tank and the other three indoor walls is not less than 1.5 m; while ensuring proper flushing function.

1.4.3 when the toilet bowl matched with the water tank provided with the inlet valve sample to be tested is installed by a corner, the toilet bowl can be tested in a rigid wall test chamber or a special reverberation chamber, and the test water tank is directly placed on the ground through the support frame without adding a water tank cover; the height from the bottom of the water tank to the indoor ground is 450mm, the distance between the back and the side of the water tank and the wall is 15cm +/-5 cm, and the distance between the water tank and the other two indoor walls is not less than 1.5 m; and meanwhile, the normal flushing function is ensured.

(2) Determination of sound source reference body and parallelepiped, hemispherical measuring surface

2.1 shape and size of Inlet valve noise Source reference

Setting the position and the size of a sound source reference body by using a three-dimensional coordinate system according to the relevant regulations of item 7.1 in GB/T3768-2017 simple method for measuring the sound power level and the sound energy level of a noise source by using an envelope measuring surface above a reflecting surface; the center of a box body formed by a sound source reference body and a mirror image of the sound source reference body on an adjacent reflecting plane is used as a coordinate origin O, and horizontal axes x and y are respectively parallel to the length and the width of the reference body. Length l using horizontal width of test water tank as sound source reference body₁And the width l taking the horizontal length of the test water tank as the sound source reference body₂And the height l taking the vertical distance from the working water level line of the test water tank to the ground as a sound source reference body₃. Characteristic dimension d of sound source reference body corresponding to different test environment conditions₀Are respectively [ (l)₁/2)²+(l₂/2)²+l₃ ²]^1/2(a reflection plane), [ l [ ]₁ ²+(l₂/2)²+l₃ ²]^1/2(two reflection planes) and [ l₁ ²+l₂ ²+l₃ ²]^1/2(three reflection planes) in meters (m).

2.2 selection of the parallelepiped measuring surface and determination of the microphone position array

According to the relevant specification of 7.2.4 items in the standard GB/T3768-2017, a parallelepiped measuring surface adopted in the test and a sound source reference body have the same azimuth coordinate origin and appearance shape, namely an imaginary parallelepiped with the area of S, enveloping the water inlet noise source of the water inlet valve to be measured, and the side of the imaginary parallelepiped parallel to the side of the reference body and the distance of d from the reference body, wherein d is more than or equal to 1.0 m.

2.2.1 if the test water tank is located according to item 1.4.1 in this embodiment, the position coordinates (x, y, z) of the 1 st to 9 th microphones are (a,0,0.5c), (0, b,0.5c), (-a, 0,0.5c), (0, -b,0.5c), (a, b, c), (-a, -b, c), (0,0, c), respectively. Area S ═ 4(ab + bc + ca), where a ═ 0.5l₁+d，b＝0.5l₂+d，c＝l₃+d；l₁、l₂、l₃Respectively the length, width and height of the sound source reference body, and the unit is meter (m); d is 1.0 m.

2.2.2 if the test tank is positioned according to item 1.4.2 in this embodiment, the 1 st to 4 th microphone position coordinates (x, y, z) are (2a,0,0.5c), (a, b,0.5c), (a, -b,0.5c), (a,0, c), respectively. Area S ═ 2(2ab + bc +2ca), where a ═ 0.5l₁+0.5d，b＝0.5l₂+d，c＝l₃+d；l₁、l₂、l₃The length (from the wall to the front end face), the width and the height of the sound source reference body are respectively, and the unit is meter (m); d is 1.0 m.

2.2.3 if the test tank is positioned according to item 1.4.3 in this embodiment, the 1 st to 3 rd microphone position coordinates (x, y, z) are (2a, -b,0.5c), (a, -2b,0.5c), (a, -b, c), respectively. Area S ═ 2(2ab + bc + ca), where a ═ 0.5l₁+0.5d，b＝0.5l₂+0.5d，c＝l₃+d；l₁、l₂、l₃Length, width and height of the sound source reference body (length and width of the reference body, i.e. the distance from two walls to the opposite face of the corresponding reference body), respectively, in meters (m); d is 1.0 m.

2.3 selection of hemispherical measurement surfaces and determination of microphone position arrays

According to the relevant provisions of item 7.2.3 of Standard GB/T3768-The origin of coordinates (i.e. the center of the box (origin O in FIGS. 9-10) formed by the reference body and the virtual images of the reference body in the adjacent reflecting surfaces) is a hemisphere with a measuring radius r, wherein r is more than or equal to 2d₀And r is more than or equal to 16.0m and more than or equal to 1.0 m.

2.3.1 if the test tank is positioned according to item 1.4.1 in this example, the measuring surface is a complete hemisphere and the area S is 2 tr²R is 2.0 m; the microphone positions are shown in FIG. 9, and the coordinates of the measuring points are shown in Table 1 (considering the strong directivity of the flushing noise of the toilet bowl, if the sound pressure level variation range measured at four basic microphone positions of 4, 5, 6 and 10 exceeds 8dB, additional microphone positions are added, and the coordinates are the points numbered as 14, 15, 16 and 20 in Table 1).

Location numbering	x/r	y/r	z/r
				4	-0.45	0.77	0.45
5	-0.45	-0.77	0.45
				6	0.89	0.00	0.45
10/20	0.00	0.00	1.00
				14	0.45	-0.77	0.45
15	0.45	0.77	0.45
				16	-0.89	0.00	0.45

2.3.2 if the test tank is positioned as in item 1.4.2 of this example, the measurement surface is 1/2 hemispheres and the area S ═ tr r²R is 3.0 m; the microphone positions are shown in fig. 10, and the coordinates of the measuring points are shown in table 2.

2.3.3 if the test tank is positioned as in item 1.4.3 of this example, the measurement surface is 1/4 hemispheres and the area S ═ tr r ²2, r is 3.0 m; the microphone positions are shown in FIG. 11, and the coordinates of the measuring points are shown in Table 3.

(3) Impulse noise determination

3.1 in the acoustic environment of a semi-anechoic chamber, directly placing a test water tank in the center of the ground in a test chamber through a support frame without adding a water tank cover; the height from the bottom of the test water tank to the ground is 450mm, so that the normal flushing function is ensured; taking the middle point of the distance between a water inlet valve and a drain valve overflow pipe in a test water tank as a reference, and respectively selecting four coordinate points which are 1.0m above the middle point, 1.0m in front of the middle point and 1.0m in front of the middle point as acoustic measurement points at the height of 1.0m away from the middle point (the two measurement points in front of the left and the right are respectively positioned at the positions 0.7m respectively on the left and the right of the measurement point in front of the middle point);

3.2 adjusting the dynamic pressure of the test to 0.30MPa +/-0.05 MPa, emptying the water in the test water tank according to the requirement of the water supplement amount to be measured, starting timing 10s after water is re-fed until the water inlet valve is naturally closed, and taking the timing as the sound level meter audio signal acquisition integral time; if the water replenishing period (half flushing or full flushing) of the sample of the water inlet valve to be tested is less than 20s, the integration time is counted by 10 s. Respectively using sound level metersThe weighting characteristic A of the pulse sound level time of weighting pulse and the weighting characteristic A of the equivalent sound level slow time of weighting equivalent sound level are respectively used for measuring the time average pulse maximum sound pressure level L 'of the water inflow noise at the coordinates of each measuring point'_{pAIi(ST)(max)}And a cumulative percent time-averaged sound pressure level L'_pAi(ST)(50)Measuring for 5 times continuously at each measuring point coordinate and recording;

3.3 Using the measured sound pressure level values at each point, calculate the corresponding impulse noise index Δ ═ L'_{pAIi(ST)(max)}－L′ _pAi(ST)(50)And if the average value delta is not less than 3dB, the water inlet noise to be detected can be judged to be pulse noise.

(4) Sound pressure level measurement

4.1 except that 1 test water tank for assembling a water inlet valve sample to be tested and necessary experimental apparatuses such as a supporting rack, a tripod and the like are reserved, all other articles in the test chamber are removed, and no redundant personnel can be present in the test chamber; the experimental operator must not wear clothing with significant sound absorption characteristics;

4.2 measuring the dimension l of the test Water tank with a Steel ruler and a L-square₁、l₂、l₃Recording, determining the space positioning of the sound source reference body and calculating the characteristic dimension d thereof according to the number of the reflection planes involved in the installation mode of the matched toilet₀(ii) a Selecting an appropriate parallelepiped or hemispherical envelope sound source measurement surface and calculating a specific dimension a, b, c or a measurement radius r thereof; calculating and recording the coordinates of the measuring points according to the position array of the selected measuring surface microphone;

4.3 the sound level meter used for measurement should have both time-weighted pulse gear "I" and A-weighted equivalent sound level gear "L_Aeq"and meets the requirement of a 1-type instrument in GB/T3785.1-2010, and the verification period does not exceed 2 years; the filter meets the requirements of a type 1 instrument in IEC 61260:1995, and the calibration period does not exceed 1 year. Before the test is started and after the test is finished, verifying the test on one or more frequencies in the measuring frequency range of the sound level meter by using a sound calibrator meeting the requirement of the level 1 accuracy in GB/T15173; the difference of the readings is not more than 0.5 dB;

4.4 the test chamber can be a semi-anechoic chamber or a reverberation chamber, the indoor available space volume is ensured to meet the installation requirements of the test water tank and the support frame thereof, corresponding water supply/drainage conditions are provided, and the dynamic pressure of test water can be regulated and controlled; wherein, the background noise in the semi-anechoic chamber is not more than 16dB (A), the acoustic condition of approximate free field above the reflecting surface can be provided, and the verification period is not more than 5 years; background noise in the reverberation room is not more than 25dB (A), and reverberation time is in the range of 5 s-6 s;

4.5, positioning coordinates of each measuring point according to the microphone position array of the selected parallelepiped or hemispherical measuring surface; simultaneously moving the tripod to a measuring point position and placing a sound level meter with related acoustic performance on a top cloud platform of the tripod to ensure that the orientation of the microphone is the same as the sound wave incident angle when the microphone is calibrated and the microphone vertically points to a measuring surface;

4.6 starting timing 10s after the water inlet valve is opened until the water inlet valve is naturally closed, and taking the timing as the integral time of sound level meter audio signal acquisition; if the water replenishing period (half flushing or full flushing) of the sample of the water inlet valve to be tested is less than 20s, the integration time is counted by 10 s. Determination of cumulative percent time-averaged sound pressure level L of background noise on selected paralleled hexahedral or hemispherical measurement surfaces using the A-weighted equivalent level of the sound level meter slow time-weighted characteristic "S" of the sound level meter_pAi(B)(50)The measurements were taken 3 times in succession at each microphone location, and the arithmetic mean was taken as the sound pressure level measurement of the background noise at that location and recorded. If the difference of the sound pressure levels measured 3 times at each position is greater than 0.5dB, re-measuring and recording;

4.7 adjusting the dynamic pressure of the test to 0.30MPa +/-0.05 MPa, emptying the water in the test water tank according to the requirement of the water supplement amount to be measured, starting timing 10s after water is re-fed until the water inlet valve is naturally closed, and taking the timing as the integral time of sound level meter sound frequency signal acquisition; if the water replenishing period (half flushing or full flushing) of the sample of the water inlet valve to be tested is less than 30s, the integral time is counted by 30 s. Determination of the time-averaged pulse maximum sound pressure level L 'of the water inlet noise of a water intake valve on a selected parallelepiped or hemispherical measuring surface using the A-weighted pulse sound level time-weighted characteristic "I" of the sound level meter'_{pAIi(ST)(max)}And recording; and simultaneously recording the dynamic pressure, the water supplement amount and the water supplement period of each water inflow.

(5) Calculation of results

5.1 selection of calculation formula

With reference to relevant regulations in GB/T3768-:

in the formula:

K_1A-a background noise correction value;

K_2A-testing the environmental correction value;

V-test Room volume in cubic meters (m)³)；

T_n-measured a weight or frequency band reverberation time in seconds(s);

4.2 data reduction requirements: intake noise A weight time-averaged pulse maximum sound pressure level L'_{pAIi(ST)(max)}And background noise A as a cumulative percentage time average sound pressure level L_pAi(B)(50)The measurement result retains a significant digit after the decimal point, and the mean value of the time average sound pressure level

4.3 measurement uncertainty: the method stipulates the repeatability standard deviation sigma of the measurement result of the water inlet noise A weighting time average pulse maximum sound pressure level of the water inlet valve of the toilet water tank on the measuring surface of a parallelepiped or a hemisphere_omcThe upper limit value is not greater than 1.5 dB. Referring to the relevant contents in GB/T3768-2017 standard, in a complete water replenishing period, the same experimenter uses the same sound level meter to measure the maximum sound pressure level average value of A weighted time average pulse on the same parallelepiped or hemisphere measuring surface selected by the same sample of the water inlet valve of the toilet water tank at the same installation position

in the formula:

(6) Performance determination

6.1 according to the national environmental protection standard and the relevant product standard requirements, adopting the following grading judgment standards:

6.2 judging the water inlet noise evaluation result of each group of toilet cistern inlet valve samples: under the test dynamic pressure condition of 0.30MPa +/-0.05 MPa, the water inlet noise of a water inlet valve sample of a toilet water tank water inlet in a specific water replenishing period (half flushing or full flushing) is tested by using the A weighted pulse sound level time weighting characteristic I of a sound level meter through a parallelepiped or hemisphere measuring surface method; effective perceived noise level L when a sample is intake of water_EPNEffective perceived noise level L of noise for water ingress for 3 samples greater than this set_EPNArithmetic mean value

When 10%, a group of samples need to be extracted again to repeat the experiment; calculating the A-weighted pulse sound level time weighting characteristic (I) of the sound level meter under the specific dynamic pressure condition of the front and the back groups of water inlet valve samplesEffective inlet noise level L measured by surface body or hemisphere measuring surface method_EPNIs arithmetic mean of

Effective perceived noise level L if water ingress noise of a sample_EPNEffective perceived noise level L of water ingress noise greater than the two sets of 6 samples_EPNArithmetic mean value

Test facilities, instrumentation and test equipment used in this example:

(1) test facility

Semi-anechoic chamber: the net size of the indoor building is 9.8m multiplied by 7.3m multiplied by 5.9m, the effective space size after the sound-absorbing wedge is hung is 7.8m multiplied by 5.3m multiplied by 4.9m, and the effective volume is 203m³Effective usable area of 41m². The ceramic tile floor is taken as a single reflecting plane, and no other fixed facilities are arranged indoors except for corresponding water supply and drainage pipelines; when the laboratory works normally and the periphery has no abnormal interference, the indoor background noise is lower than 14.1dB (A); the extended uncertainty of the sound pressure level measurement is U₉₅＝(0.4～1.0)dB，k＝2。

(2) Test equipment and equipment

2.1 Sound level Meter: the model is NA-28 and can measure equivalent continuous sound pressure L produced by Japan rational sound company_eqThe performance meets the regulation of a 1-type integral sound level meter in GB/T3785, and the filter meets the requirement of GB 3241; the A-weighted linear operation range is 25 dB-130 dB, the upper limit of peak sound level measurement is 143dB, the maximum value of inherent noise A weight is 17dB, the measurement frequency range is 10 Hz-20 kHz, and the sampling period is 15.6 ms. The sound pressure level uncertainty U is 0.4dB to 1.0dB (k is 2); sound pressure level uncertainty at a reference frequencyThe degree U is 0.07dB (k is 2); the uncertainty of the calibration result is 1.0dB (k 2).

2.2 sound calibrator: the model AWA6221A produced by hundred million Europe instrument equipment Limited company is used for absolute sound pressure calibration of a sound level meter, and the acoustic performance meets the 1-level accuracy requirement in GB/T15173; the nominal sound pressure level is 94dB and 114dB (taking 20 mu Pa as a benchmark), the applicable frequency range is 1 kHz-5 Hz, the sound pressure level accuracy is +/-0.2 dB (23 ℃) and +/-0.3 dB (-10 ℃ -50 ℃), and the total harmonic distortion is less than or equal to 1% when the sound pressure level is 94 dB.

2.3 ruler: a straight steel ruler and a square ruler with the division value of 1 mm.

2.4 stopwatch: the accuracy was 0.01 s.

2.5 tripod: the carbon fiber or aluminum alloy material bears more than 10kg and contains the maximum height of the holder of 2.0 m.

The detection data and result calculation of this embodiment:

in the semi-muffling chamber, a sound level meter is applied to test the water inlet noise of a water inlet valve sample in a flushing water tank arranged in the center of the ground, and the detection data and result evaluation of the parallelepiped and hemisphere measuring surface methods are respectively shown in tables 4 and 5.

TABLE 4 Impulse noise data for inlet valve inlet (parallelepiped measuring surface method on a reflecting plane)

TABLE 5 water inlet noise pulse detection data of water inlet valve (hemisphere measuring surface method on a reflecting plane)

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent modifications made by the contents of the specification and the drawings, or applied directly or indirectly to other related technical fields, are included in the scope of the present invention.

Claims

1. A method for detecting water inlet noise of a water inlet valve of a toilet water tank comprises the following steps: (1) installing and debugging a sample; (2) determining a sound source reference body, a parallelepiped and a hemisphere measuring surface; (3) judging impulse noise; (4) sound pressure level measurement; (5) calculating the level of effective perceived noise, correcting background noise and testing environment; (6) evaluating the detection result; the method is characterized in that the pulse property of the inlet water noise of the inlet valve of the toilet water tank is judged by calculating the pulse noise index; a-weighted pulse sound level time weighting characteristic "I" using a sound level meter for effective perceived noise level L on a parallelepiped or hemispherical measurement surface_EPNAccurate quantitative determination is carried out to the noise of intaking of sign, and is specific:

in impulse noise determination:

according to appendix D in GB/T3768 and 1996 'simple method for measuring the surface above the sound power level reflecting surface of the noise source by using an acoustic sound pressure method', after positioning a sample of the water inlet valve of the toilet tank to be measured, selecting four representative acoustic measurement points based on the directivity characteristics of the water inlet noise; under the conditions of a specific water replenishing period and set test dynamic pressure, respectively applying the weighting characteristic 'I' of the A weighting pulse sound level time and the weighting characteristic 'S' of the A weighting equivalent sound level slow time of the sound level meter to the time-averaged pulse maximum sound pressure level L 'of the water inflow noise at the coordinates of each measuring point'_{pAIi(ST)(max)}And a cumulative percent time average sound pressure level L'_pAi(ST)(50)Carrying out measurement; the measurement is carried out 5 times in succession at each measuring point coordinate, and the corresponding impulse noise index Δ L 'is calculated'_{pAIi(ST)(max)}－L′_pAi(ST)(50)When the average value is more than or equal to 3dB, the water inlet noise of the water inlet valve sample to be detected can be judged to be pulse noise;

in sound pressure level measurement:

according to GB/T3768-2017, aiming at the sample installation requirement of the inlet valve of the toilet water tank, the positioning of the sound source reference body under different reflection plane conditions is determined and the characteristic dimension d of the sound source is calculated₀(ii) a Simultaneously selecting a parallelepiped or hemispherical measuring surface corresponding to the water inlet noise source reference body of the water inlet valve, determining the size of the measuring surface, and determining the coordinates of the microphone position arrays of different measuring surfaces; in a semi-anechoic chamber or a reverberation chamber, a specific water replenishing period of a water inlet valve of a water tank of a toilet is used as integral time of audio signal acquisition, and the accumulated percentage time average sound pressure level L of background noise on the measuring surface of a selected parallelepiped or hemisphere is determined by using a slow time weighting characteristic S of weighting equivalent sound level of A of a sound level meter_pAi(B)(50)(ii) a Then under the condition of test dynamic pressure of 0.30MPa +/-0.05 MPa, aiming at different water supplement quantity test requirements of a toilet water tank, applying the A weighted pulse sound level time weighted characteristic 'I' of a sound level meter, and determining the time-averaged pulse maximum sound pressure level L 'of the water inlet noise of the water inlet valve on the selected parallelepiped or hemispherical measuring surface'_{pAIi(ST)(max)}；

In the effective perceived noise level calculation:

according to GB/T3768-2017, under the test dynamic pressure condition of 0.30MPa +/-0.05 MPa, the specific water replenishing period of the water inlet valve of the toilet water tank is taken as the integration time of audio signal acquisition, and the water inlet noise time average pulse maximum sound pressure level L 'measured by the weighted characteristic A of the sound level meter and the weighted characteristic S of the weighted equivalent sound level is applied'_{pAIi(ST)(max)}And the cumulative percentage of background noise time-averaged sound pressure level L_pAi(B)(50)Calculating the average value of A weighted time average sound pressure level corresponding to the microphone array on the selected parallelepiped or hemispherical measuring surface as the basic data

And

and correcting value K for background noise_1ATesting environment repairPositive value of K_2AThe effective sensing noise level L of the water inlet noise of each sample of the toilet cistern inlet valve under the specific dynamic pressure condition is deduced_EPNAnd the mean of the effective perceived noise level of the water ingress noise for each set of samples

(1) selecting a calculation formula: with reference to GB/T3768-:

if Δ L_pAIIf the noise is more than 10dB, the background noise correction is not needed; if 10dB >. DELTA.L_pAIAnd if the value is more than or equal to 3dB, correcting according to the formula (4):

K_1A＝-10lg(1-10^-0.1△LpAI))……………………………………………………………(4)

K_2A＝l0lg(l+4S/A)…………………………………………………………………(5)

when K is_2AWhen the power is less than or equal to 7dB, the measurement made according to the method is effective; wherein the semi-anechoic chamber and the reverberation chamberThe sound absorption quantity calculation formulas are respectively as follows:

A＝α·S_ν……………………………………………………………………………(6)

A＝0.16V/T_n…………………………………………………………………………(7)

in the formula:

L_pAi(B)(50)measuring gauges on parallelepipeds or hemispheresThe cumulative percentage time average sound pressure level in decibels (dB) of the background noise measured at the ith microphone location;

K_1A-a background noise correction value;

K_2A-testing the environmental correction value;

S_νthe total area of the room boundary of the test chamber, wall, floor, ceiling, in square meters (m)²)；

V-test Room volume in cubic meters (m)³)；

T_n-measured a weight or frequency band reverberation time in seconds(s);

the time-averaged pulse maximum sound pressure level of the inlet water noise of the inlet valve of the toilet water tank measured by the parallelepiped or hemispherical measuring surface method is expressed in decibels (dB);

L_EPNthe effective perceived noise level in decibels (dB) of the inlet noise measured by the parallelepiped or hemispherical measuring surface method for each toilet cistern inlet valve;

(3) measurement uncertainty: the method specifies the repeatability standard deviation sigma of the measurement result of the water inlet noise A weighting time average pulse maximum sound pressure level of the toilet cistern water inlet valve on the parallelepiped or hemispherical measurement surface_omcThe upper limit value is not more than 1.5 dB; referring to GB/T3768-2017 standard, in a complete water replenishing period, the same experimenter uses the same sound level meter to measure the average value of the maximum sound pressure level of the A weighted time-averaged pulse on the same parallelepiped or hemisphere measuring surface selected by the same sample of the water inlet valve of the toilet water tank at the same installation position

6 times of repeated measurement are carried out, for each repeated measurement, the water inlet valve sample needs to be installed again, adjusted and positioned, and background noise correction is carried out on the measurement result; standard deviation of repeatability σ_omcThe calculation formula of (2) is as follows:

in the formula:

-the j-th repeated measurement of the inlet noise of the inlet valve of the toilet cistern and the correction of the background noise are carried out on the parallelepiped or the halfMeasuring the average value of the A weighted time average maximum pulse average sound pressure level on the surface of the ball;

-an arithmetic mean sound pressure level calculated from all repeated measurements;

in the evaluation of the results:

effective perceived noise level L when a sample is intake of water_EPNEffective perceived noise level L of noise for water ingress for 3 samples greater than this set_EPNArithmetic mean value

At 10%, re-extracting a group of samples to repeat the experiment; and calculating the effective sensing noise level L of the water inlet noise measured by a parallelepiped or hemisphere measuring surface method by using the A weighting pulse sound level time weighting characteristic I of the sound level meter under the specific dynamic pressure condition of the front and the rear groups of water inlet valve samples of the toilet water tank_EPNIs arithmetic mean of

2. The method for detecting the water inlet noise of the water inlet valve of the toilet tank according to claim 1, wherein the sample is installed and debugged according to the following steps:

(1) taking 3 water inlet valve samples of toilet water tank fittings of the same type, specification and size produced by the same manufacturer and the same batch as a group, wherein the use mode can be side pressing or top pressing, single-flushing type or double-flushing type;

(2) the standard water tank meeting the technical requirements of national standard GB 26730-: 400mm × 175mm × 300 mm; a standard tank or flush tank, excluding a concealed tank; the relative water level of each component after being installed accords with the requirement of item 5.4.1, and the relative water level of each component after being installed accords with the requirement of item 5.4.10.2;

(3) installing a water inlet valve sample inside a test water tank according to the use instruction of a production plant, and for a water inlet valve provided with a water supplementing device, firmly fixing a water supplementing pipe on the water inlet valve and marking a rated water supplementing ratio, wherein the water supplementing quantity can meet the water seal recovery requirement of a toilet; according to the regulations of 5.2.3, 5.2.4 and 5.2.8 in GB 26730-; after static pressure and dynamic pressure tightness tests, the rising height of the water level of the water tank is not more than 8mm, and no visible drip leakage exists after the water inlet valve is closed; when the water is drained to a specified height, the water inlet valve can be automatically opened, the water can be automatically closed after the water is fed to a working water level, and the height difference of the working water level of the water fed for 5 times is not more than 5 mm;

(4) when the toilet bowl matched with the water tank provided with the water inlet valve sample to be tested is not installed close to any wall, if the test is carried out in the acoustic environment similar to the free field above the reflecting surface of the semi-anechoic chamber, the test water tank can be directly placed in the center of the ground through the supporting frame without adding a water tank cover; the height between the bottom of the water tank and the indoor ground is 450mm, and the normal flushing function is ensured; if the test is carried out in a rigid wall test chamber or a special reverberation chamber, the test water tank can be placed on the ground through the supporting rack without adding a water tank cover; the height from the bottom of the water tank to the indoor ground is 450mm, and the distance between the water tank and any wall in the room is not less than 1.0 m; meanwhile, the normal flushing function is ensured;

(6) when the pedestal pan matched with the water tank provided with the water inlet valve sample to be tested is installed by a corner, the pedestal pan can be tested in a rigid wall test chamber or a special reverberation chamber, the test water tank is directly placed on the ground through the support frame, and a water tank cover is not added; the height from the bottom of the water tank to the indoor ground is 450mm, the distance between the back and the side of the water tank and the wall against which the water tank leans is 15cm +/-5 cm, and the distance between the water tank and the other two indoor walls is not less than 1.5 m; while ensuring proper flushing function.

3. The method for detecting the water inlet noise of the water inlet valve of the toilet tank as claimed in claim 1, wherein the determination of the sound source reference body and the measuring surfaces of the parallelepiped and the hemisphere is performed according to the following steps:

(1) determination of the shape and the size of the water inlet noise source reference body of the water inlet valve: according to item 7.1 in GB/T3768-2017 simple method for measuring sound power level and sound energy level of a noise source by using an acoustic sound pressure method and adopting an envelope measuring surface above a reflecting surface, setting the position and the size of a sound source reference body by using a three-dimensional coordinate system; the center of a box body formed by a sound source reference body and mirror images of the sound source reference body on adjacent reflecting planes is taken as a coordinate origin O, and horizontal axes x and y are respectively parallel to the length and the width of the reference body; length l of sound source reference body using horizontal width of test water tank₁And the width l taking the horizontal length of the test water tank as the sound source reference body₂And taking the vertical distance between the working water level line of the test water tank and the ground as a sound source baseHeight of quasimody l₃(ii) a Characteristic dimension d of sound source reference body corresponding to different test environment conditions₀Are respectively [ (l)₁/2)²+(l₂/2)²+l₃ ²]^1/2A reflective plane; [ l₁ ²+(l₂/2)²+l₃ ²]^1/2Two reflecting planes; [ l₁ ²+l₂ ²+l₃ ²]^1/2Three reflection planes in meters (m);

(2) determination of the parallelepiped measuring surface and its microphone position array: according to item 7.2.4 in the standard GB/T3768-2017, the used parallelepiped measuring surface and the sound source reference body have the same-orientation coordinate origin and appearance shape, namely an imaginary parallelepiped with the area of S, enveloping the water inlet noise source of the water inlet valve to be measured, each side parallel to the side of the reference body and the distance d from the reference body, wherein d is more than or equal to 1.0 m; if the test water tank is not close to any wall when being installed, the position coordinates (x, y, z) of 1 st to 9 th microphones are respectively (a,0,0.5c), (0, b,0.5c), (-a, 0,0.5c), (0, -b,0.5c), (a, b, c), (-a, -b, c), (0,0, c); area S ═ 4(ab + bc + ca), where a ═ 0.5l₁+d，b＝0.5l₂+d，c＝l₃+d；l₁、l₂、l₃Respectively, the length, width and height of the sound source reference body, and the unit is meter (m); d is 1.0 m; if the test water tank is installed close to the wall, the 1 st to 4 th microphones have the position coordinates (x, y, z) of (2a,0,0.5c), (a, b,0.5c), (a, -b,0.5c), (a,0, c) respectively, and the area S is 2(2ab + bc +2ca), wherein a is 0.5l₁+0.5d，b＝0.5l₂+d，c＝l₃+d；l₁、l₂、l₃The length, width and height of the sound source reference body from the wall to the front end face are respectively, and the unit is meter (m); d is 1.0 m; if the test water tank is arranged close to a wall corner, the 1 st to 3 rd microphone position coordinates (x, y, z) are (2a, -b,0.5c), (a, -2b,0.5c), (a, -b, c) respectively; area S ═ 2(2ab + bc + ca), where a ═ 0.5l₁+0.5d，b＝0.5l₂+0.5d，c＝l₃+d；l₁、l₂、l₃Length, width and height of the sound source reference body respectivelyThe length and width of the reference body, i.e. the distance from the two walls to the opposite faces of the respective reference body, in meters (m); d is 1.0 m;

(3) determination of hemispherical measurement surfaces and their microphone position arrays: according to item 7.2.3 of GB/T3768-2017, the origin of coordinates of the hemisphere measuring surface used in the test and the sound source reference body have the same orientation, that is, the center of the box body formed by the reference body and the virtual image thereof in the adjacent reflecting surface is a hemisphere surface with the measuring radius r, wherein r is more than or equal to 2d₀And r is more than or equal to 16.0m and more than or equal to 1.0 m; if the test water tank is not close to any wall when being installed, the measuring surface is a complete hemisphere and the area S is 2 pi r²R is 2.0 m; the position coordinates (x, y, z) of the microphones are (-0.45r,0.77r,0.45r), (-0.45r, -0.77r,0.45r), (0.89r,0.00r,0.45r), (0.00r,0.00r,1.00r), (0.45r, -0.77r,0.45r), (0.45r,0.77r,0.45r), (-0.89r,0.00r,0.45r) respectively; in view of the strong directivity of the water inlet noise of the water inlet valve, if the sound pressure level change range measured at the first four basic microphone positions exceeds 8dB, the additional microphone position is additionally arranged; if the test tank is mounted against a wall, the measurement surface is an 1/2 hemisphere with an area S ═ π r²R is 3.0 m; the position coordinates (x, y, z) of the microphone are respectively (0.45r, -0.77r,0.45r), (0.45r,0.77r,0.45r), (0.66r,0.00r,0.75 r); if the test tank is mounted against a corner, the measurement surface is an 1/4 hemisphere with an area S ═ π r²2, r is 3.0 m; the microphone position coordinates (x, y, z) are (0.45r, -0.77r,0.45r), (0.77r-0.45r,0.45r), (0.47r, -0.47r,0.75r), respectively.

4. The method for detecting the water inlet noise of the water inlet valve of the toilet tank according to claim 1, wherein the determination of the impulse noise is performed according to the following steps:

(1) in the acoustic environment of a semi-anechoic chamber, a test water tank is directly placed in the center of the ground in a test chamber through a support frame without adding a water tank cover; the height from the bottom of the test water tank to the ground is 450mm, so that the normal flushing function is ensured; taking the middle point of the distance between a water inlet valve and a drain valve overflow pipe in a test water tank as a reference, and respectively selecting four coordinate points which are 1.0m above the middle point, 1.0m in front of the middle point and 1.0m in front of the middle point as acoustic measurement points at the height of 1.0m away from the middle point, wherein the two measurement points in front of the left and the right are respectively positioned at the left and the right of the measurement point in front and are respectively 0.7m away from the measurement point in front;

(2) adjusting the test dynamic pressure to 0.30MPa +/-0.05 MPa, emptying water in the test water tank according to the water replenishing requirement to be tested, starting timing 10s after water is newly fed until a water inlet valve is naturally closed, and taking the timing as the sound level meter audio signal acquisition integration time; if the water replenishing cycle of the sample of the water inlet valve to be detected is less than 20s, the integration time is counted by 10 s; time average pulse maximum sound pressure level L 'of water inflow noise at coordinates of each measuring point by respectively applying A weight pulse sound level time weight characteristic' I 'and A weight equivalent sound level slow time weight characteristic' S 'of sound level meter'_{pAIi(ST)(max)}And a cumulative percent time average sound pressure level L'_pAi(ST)(50)Measuring for 5 times continuously at each measuring point coordinate and recording;

(3) calculating a corresponding impulse noise index delta L 'by using the measured sound pressure level values of the points'_{pAIi(ST)(max)}－L′_pAi(ST)(50)And if the average value delta is not less than 3dB, the water inlet noise to be detected can be judged to be pulse noise.

5. The method of claim 1, wherein the sound pressure level measurement is performed by the steps of:

(1) except that 1 test water tank for assembling a water inlet valve sample to be tested and necessary experimental apparatuses such as a supporting rack and a tripod are reserved, all other articles in the test chamber are removed, and no redundant personnel can be present in the test chamber; the experimental operator must not wear clothing with significant sound absorption characteristics;

(2) measuring test water tank size l with steel ruler and square₁、l₂、l₃Recording, determining the space positioning of the sound source reference body and calculating the characteristic dimension d thereof according to the number of the reflection planes involved in the installation mode of the matched toilet₀(ii) a Selecting suitable parallelepiped or hemisphere enveloping sound source measuring surface and calculating its specific size a, b, c or measuring radiusr; calculating and recording the coordinates of the measuring points according to the position array of the selected measuring surface microphone;

(3) the sound level meter used for measurement should have time-weighted pulse gear 'I' and A-weighted equivalent sound level gear 'L' at the same time_Aeq"and meets the requirement of a 1-type instrument in GB/T3785.1-2010, and the verification period does not exceed 2 years; the filter meets the requirement of a type 1 instrument in IEC 61260:1995, and the calibration period does not exceed 1 year; before the test is started and after the test is finished, verifying the test on one or more frequencies in the measuring frequency range of the sound level meter by using a sound calibrator meeting the requirement of the level 1 accuracy in GB/T15173; the difference of the readings is not more than 0.5 dB;

(4) the test chamber can be a semi-anechoic chamber or a reverberation chamber, so that the available indoor space volume meets the installation requirements of the test water tank and the support frame thereof, corresponding water supply/drainage conditions are provided, and the dynamic pressure of test water can be regulated and controlled; wherein, the background noise in the semi-silencing chamber is not more than 16dB (A), the acoustic condition of approximate free field above the reflecting surface can be provided, and the verification period is not more than 5 years; background noise in the reverberation room is not more than 25dB (A), and reverberation time is in the range of 5 s-6 s;

(5) positioning coordinates of each measuring point according to a microphone position array of the selected parallelepiped or hemispherical measuring surface; simultaneously moving the tripod to a measuring point position and placing a sound level meter with related acoustic performance on a top tripod head of the tripod to ensure that the orientation of the microphone is the same as the sound wave incident angle when the microphone is calibrated and the microphone vertically points to a measuring surface;

(6) starting timing 10s after the water inlet valve is opened until the water inlet valve is naturally closed, and taking the timing as the integral time of sound level meter audio signal acquisition; if the water replenishing cycle of the sample of the water inlet valve to be detected is less than 20s, the integration time is counted by 10 s; determination of cumulative percent time-averaged sound pressure level L of background noise on selected parallelepiped or hemispherical measurement surfaces using the A-weighted equivalent Sound level Slow time-weighted characteristic "S" of a Sound level Meter_pAi(B)(50)Continuously measuring for 3 times at each microphone position, taking the arithmetic mean value as the sound pressure level measurement value of the background noise at the position and recording; if the difference of the sound pressure levels measured 3 times at each position is greater than 0.5dB, re-measuring and recording;

(7) adjusting the test dynamic pressure to 0.30MPa +/-0.05 MPa, emptying water in the test water tank according to the water replenishing requirement to be tested, starting timing 10s after water is re-fed until the water inlet valve is naturally closed, and taking the timing as the integral time of sound level meter audio signal acquisition; if the water replenishing cycle of the sample of the water inlet valve to be detected is less than 30s, the integration time is counted by 30 s; determination of the time-averaged pulse maximum sound pressure level L 'of the water inlet noise of a water intake valve on a selected parallelepiped or hemispherical measuring surface using the A-weighted pulse sound level time-weighted characteristic "I" of the sound level meter'_{pAIi(ST)(max)}And recording; and simultaneously recording the dynamic pressure, the water supplement amount and the water supplement period of each water inflow.

6. The method for detecting the water inlet noise of the water inlet valve of the toilet tank as claimed in claim 1, wherein the result evaluation is performed according to the following steps:

the noise of water inlet is very high, and the environmental protection performance is poor;

(2) and (3) judging the water inlet noise evaluation result of each group of toilet cistern inlet valve samples: under the test dynamic pressure condition of 0.30MPa +/-0.05 MPa, the A weighting pulse sound level time weighting characteristic I of a sound level meter is used for testing the water inlet noise of a water inlet valve sample of a toilet water tank after half flushing or full flushing in a specific water replenishing period by a parallelepiped or hemisphere measuring surface method; effective perceived noise level L when a sample is intake of water_EPNEffective perceived noise level L of noise for water ingress for 3 samples greater than this set_EPNArithmetic mean value

At 10%, re-extracting a group of samples to repeat the experiment; calculating the effective sensing noise level L of the water inlet noise measured by a parallelepiped or hemisphere measuring surface method by using the A weighted pulse sound level time weighting characteristic I of a sound level meter under the condition of specific dynamic pressure of front and back two groups of water inlet valve samples_EPNIs arithmetic mean of

Evaluation of water inflow noise as a sample of the water inlet valve of the toilet water tankAnd (4) indexes.