[0138] The following describes the present invention in detail with reference to the accompanying drawings and preferred embodiments, so that the advantages and features of the present invention can be more easily understood by those skilled in the art, so as to make a clearer and clearer definition of the protection scope of the present invention.
[0139] In this embodiment, the use mode is top press, double flush, and the double-stage water inlet valve samples with nominal water replenishment amounts of 6L and 3L respectively are installed in the flushing water tank used with the toilet; water is fed under the condition of full flush water replenishment Take noise detection as an example.
[0140] The specific detection method is carried out according to the following steps:
[0141] (1) Sample installation and commissioning
[0142] 1.1 Sample quantity and specifications
[0143] The three types, specifications, and dimensions of the toilet tank fittings from the same manufacturer and batch are used as a set of water inlet valve samples. The use method can be side press or top press (single flush or double flush).
[0144] 1.2 Sample installation
[0145] Equipped with a standard water tank that meets the technical requirements of the national standard GB 26730-2011 "Gravity flushing device and sanitary ware rack for sanitary ware toilets" or a flushing water tank that meets the requirements for toilet use (its components meet the relevant technical requirements in GB 26730-2011) , The inner cavity size of the standard water tank is length×width×height: 400mm×175mm×300mm; the relative water level of each part of the standard water tank or flushing water tank (excluding the hidden water tank) after installation meets the requirements of Article 5.4.1, and each hidden water tank The relative water level of the components after installation meets the requirements of Article 5.4.10.2.
[0146] 1.3 Sample debugging
[0147] Refer to the manufacturer’s instructions to install the water inlet valve sample inside the test water tank. For the water inlet valve equipped with water replenishment device, the water replenishment pipe is firmly fixed on the water inlet valve and the rated water replenishment ratio is indicated. The water replenishment amount can meet the recovery of the toilet water seal. Claim. According to the provisions of Article 5.2.3, Article 5.2.4 and Article 5.2.8 of GB 26730-2011, the water inlet valve sample of the toilet tank to be tested shall not be less than 0.05L/s under the dynamic pressure of 0.05MPa. The inlet water flow rate at 0.50MPa dynamic pressure is not more than 0.33L/s; after static pressure and dynamic pressure tightness test, the rising height of the water tank water level is not more than 8mm, and there is no visible drip after the water inlet valve is closed; The water valve can be opened automatically, and can be automatically closed after the water enters to the working water level. The height difference of the working water level for 5 consecutive water inlets is not more than 5mm. The relative water level of each component of the flushing water tank (excluding the hidden water tank) after installation should meet figure 1 Requirements, the relative water level of each component of the hidden water tank after installation should meet figure 2 Claim.
[0148] 1.4 Sample positioning
[0149] 1.4.1 When the toilet used with the water tank equipped with the water inlet valve sample to be tested is not installed close to any wall, if the test is performed in an acoustic environment similar to a free field above the reflective surface of the semi-anechoic room, the test water tank can be passed The support frame is directly placed in the center of the ground without a water tank cover; the height of the bottom of the water tank from the indoor floor is 450mm, and the flushing function is normal. If the test is carried out in a rigid wall test room or a special reverberation room, the test water tank can be placed on the ground through the support frame, without the water tank cover; the height of the bottom of the water tank from the indoor floor is 450mm, and it is the same as any indoor The distance between one wall is not less than 1.0m; at the same time, ensure the normal flushing function.
[0150] 1.4.2 When the toilet used with the water tank equipped with the water inlet valve sample to be tested is installed against the wall, the test can be carried out in a rigid wall test room or a special reverberation room, and the test water tank is directly placed on the ground through the support frame No water tank cover; make the bottom of the water tank 450mm from the indoor floor, the distance between the back of the water tank and the wall on which it rests is 15cm±5cm, and the distance between it and the other three walls in the room is not less than 1.5m; The flushing function is normal.
[0151] 1.4.3 When the toilet used with the water tank equipped with the water inlet valve sample to be tested is installed against the corner, the test can be carried out in a rigid wall test room or a special reverberation room, and the test water tank is directly placed on the ground through the supporting frame No water tank cover is added; the height of the bottom of the water tank from the indoor floor is 450mm, the distance between the back and side of the water tank and the wall against which it rests is 15cm±5cm, and the distance between the other two walls in the room is not less than 1.5m; Also make sure that the flushing function is normal.
[0152] (2) Determination of sound source reference body and parallelepiped measuring surface
[0153] 2.1 Determination of the shape and size of the reference body of the inlet noise source of the inlet valve
[0154] According to the relevant provisions of Article 7.1 of GB/T 3767-2016 "Acoustic Sound Pressure Method to Determine the Sound Power Level of Noise Sources and the Engineering Law of the Approximate Free Field Above the Reflecting Surface", the position of the reference body of the sound source is based on the three-dimensional coordinate system And size settings; for the different installation methods of ceramic toilets used with the water tank equipped with the sample of the water inlet valve to be tested, the center of the box composed of the sound source reference body and its mirror image on the adjacent reflection plane is used as The coordinate origin O, the horizontal axes x and y are respectively parallel to the length and width of the reference body. Take the horizontal width of the test water tank as the length of the sound source reference body l 1 , Take the horizontal length of the test tank as the width of the sound source reference body l 2 , Take the vertical distance between the working water level of the test tank and the ground as the height of the sound source reference body l 3. Corresponding to different test environment conditions, the characteristic size of the sound source reference body d 0 Respectively [(l 1 /2) 2 +(l 2 /2) 2 +l 3 2 ] 1/2 (A reflecting plane), (l 1 2 +(l 2 /2) 2 +l 3 2 ] 1/2 (Two reflecting planes) and (l 1 2 +l 2 2 +l 3 2 ] 1/2 (Three reflection planes), the unit is meter (m).
[0155] 2.2 Selection of parallelepiped measurement surface and determination of microphone position array
[0156] Determination of the parallelepiped measurement surface and its microphone position array: According to the relevant provisions of Article 7.2.4 and 8.1.2 of the standard GB/T 3767-2016, the parallelepiped measurement surface used in the test is the same as the sound source reference body The origin of the coordinates and the appearance shape of the azimuth, that is, an imaginary parallelepiped with an area of S, envelopes the noise source of the inlet valve to be measured, each side parallel to the edge of the reference body, and a distance d from the reference body, where d≥ 1.0m.
[0157] 2.2.1 If the toilet used with the water tank equipped with the sample of the water inlet valve to be tested is installed and positioned in accordance with Article 1.4.1 in this embodiment, the corresponding parallelepiped measuring surface and its microphone position array are as follows: Figure 4 As shown, the coordinates of the measuring point are shown in Table 1, where the measuring distance d=1.0m; the area S of the measuring surface is calculated according to formula (1):
[0158] S=4(ab+bc+ca)........................................ ...........(1)
[0159] In the formula: a=0.5l 1 +d, b=0.5l 2 +d, c=l 3 +d; where l 1 , L 2 , L 3 They are the length, width and height of the reference body of the sound source.
[0160] Table 1 The parallelepiped measurement surface microphone position array coordinates with the inlet valve sample on a reflecting plane
[0161] Microphone position 1 2 3 4 5 6 7 8 9 x a 0 -A 0 a -A -A a 0 y 0 b 0 -B b b -B -B 0 z 0.5c 0.5c 0.5c 0.5c c c c c c
[0162] 2.2.2 If the toilet used with the water tank equipped with the sample of the water inlet valve to be tested is installed in accordance with Article 1.4.2 of this embodiment, the positioning is carried out, and the corresponding parallelepiped measuring surface and its microphone position array are as follows Figure 5 As shown, the coordinates of the measuring point are shown in Table 2, where the measuring distance d=1.0m; the area S of the measuring surface is calculated according to formula (2):
[0163] S=2(2ab+bc+2ca).......................................( 2)
[0164] In the formula: a=0.5l 1 +0.5d, b=0.5l 2 +d, c=l 3 +d; where l 1 , L 2 , L 3 They are the length (distance from the wall to the front face), width and height of the reference body of the sound source.
[0165] Table 2 The parallelepiped measurement surface microphone position array coordinates with the inlet valve sample located on two reflecting planes
[0166] Microphone position 1 2 3 4 5 6 x 2a a a 2a 2a a y 0 b -B b -b 0 z 0.5c 0.5c 0.5c c c c
[0167] 2.2.3 If the toilet used with the water tank equipped with the sample of the water inlet valve to be tested is installed and positioned according to Article 1.4.3 of this embodiment, the corresponding parallelepiped measuring surface and its microphone position array are as follows Image 6 As shown, the coordinates of the measuring point are shown in Table 3, where the measuring distance d=1.0m; the area S of the measuring surface is calculated according to formula (3):
[0168] S=2(2ab+bc+ca)...............................(3)
[0169] In the formula: a=0.5l 1 +0.5d, b=0.5l 2 +0.5d, c=l 3 +d; where l 1 , L 2 , L 3 Are the length, width and height of the reference body of the sound source (the length of the reference body l 1 And wide l 2 , That is, the distance from the two walls to the opposite surface of the corresponding reference body).
[0170] Table 3 The parallelepiped measurement surface microphone position array coordinates with the inlet valve sample on the three reflecting planes
[0171] Microphone position 1 2 3 4 x 2a a 2a a y -b -2b -2b -b z 0.5c 0.5c c c
[0172] (3) Sound pressure level measurement
[0173] 3.1 Except for a test water tank equipped with a sample of the water inlet valve to be tested and its supporting frame, tripod and other necessary experimental equipment, all other items in the test room should be removed, and no redundant personnel should be present in the test room; the experiment operator should not wear it Clothing with obvious sound absorption characteristics; use a certified thermometer and barometer to measure and record the air temperature and atmospheric pressure in the test room.
[0174] 3.2 Before testing the sample of the toilet tank inlet valve, first measure the size of the test tank with a steel ruler and square ruler. 1 , L 2 , L 3 And record; according to the number of reflection planes involved in the installation of the supporting toilet, determine the spatial location of the sound source reference body and calculate its characteristic size d 0; Select the applicable parallelepiped envelope sound source to measure the surface and calculate its dimensions a, b, c. Measure the array of surface microphone positions according to the selected parallelepiped, calculate and record the coordinates of the measuring point.
[0175] 3.3 The sound level meter used for measurement should meet the requirements of Type 1 instrument in GB/T 3785.1-2010, and the verification period shall not exceed 2 years; the filter shall meet the requirements of Type 1 instrument in IEC 61260:1995, and the calibration period shall not exceed 1 year. Before and after each test, a sound calibrator that meets the level 1 accuracy requirements of GB/T 15173 is used to verify it at one or more frequencies within the measurement frequency range of the sound level meter; the difference in readings Not more than 0.5dB.
[0176] 3.4 The water inlet noise test room for the toilet tank inlet valve can be a semi-anechoic room or a reverberation room to ensure that the available space in the test room meets the installation requirements of the test water tank and its supporting frame, and has corresponding water supply/drainage conditions. The dynamic pressure of the water can be adjusted; the background noise of the semi-anechoic chamber is not more than 16dB(A), which can provide acoustic conditions similar to the free field above the reflecting surface, and the verification period is not more than 5 years; A), the reverberation time is in the range of 5s to 6s.
[0177] 3.5 In the test room that meets the above requirements, according to the selected parallelepiped measurement surface microphone position array, locate the coordinates of the measuring point; at the same time, move the tripod to the position of the measuring point and place the sound level meter with relevant acoustic performance on top of it PTZ, make sure that the microphone orientation is the same as the incident angle of the sound wave when it is calibrated and points perpendicular to the measurement surface.
[0178] 3.6 Start timing 10s after the inlet valve is opened, until the inlet valve is naturally closed, which is used as the integration time of the sound frequency signal collection of the sound level meter; if the sample replenishment period (half flush or full flush) of the inlet valve to be tested is less than 30s, The integration time is calculated as 20s. Use the slow time weighting characteristic "S" of the sound level meter's A-weighted equivalent sound level to determine the cumulative percentage of background noise on the selected parallelepiped measurement surface. Time average sound pressure level L pAi(B)(50) Measure 3 times continuously at each microphone position, and take the arithmetic mean value as the sound pressure level measurement value of the background noise at that position and record it. If the difference between the sound pressure levels measured 3 times at each position is greater than 0.5dB, re-measure and record.
[0179] 3.7 Adjust the test dynamic pressure to 0.30MPa±0.05MPa, and drain the water in the test tank according to the requirements of the water supply to be tested; and start timing 10s after refilling the water until the water inlet valve is naturally closed as a sound The integration time of the sound frequency signal acquisition of the level meter; if the water replenishment period (half flush or full flush) of the sample of the inlet valve to be tested is less than 30s, the integration time is calculated as 20s. Use the A-weighted slow-time weighting characteristic "S" of the sound level meter's equivalent sound level to determine the cumulative percentage of the water inlet noise of the toilet tank inlet valve on the selected parallel hexahedron. Time average sound pressure level L′ pAi(ST)(50) Measure 3 times continuously at each microphone position, and take the arithmetic mean value as the sound pressure level measurement value of the water inlet noise at that position and record it. If the difference between the sound pressure levels measured 3 times at each position is greater than 0.5dB, re-measure; meanwhile record the dynamic pressure, water replenishment amount and replenishment period of each water intake.
[0180] (4) Result calculation
[0181] 4.1 Calculation formula selection: referring to the relevant regulations in GB/T 3767-2016, the calculation formula of the test parameters involved in this embodiment is as follows:
[0182]
[0183]
[0184]
[0185] If △L pA(50)15dB, no background noise correction is needed; if 6dB≤△L p(50) ≤15dB, then make corrections according to formula (7).
[0186] K 1A =-10lg(1-10 -0.1△LpA(50) )…………………………………………(7)
[0187] K 2A =l0lg(l+4S/A)………………………………………………(8)
[0188] When K 2A When ≤4dB, the measurement made according to the patented method is valid; the calculation formulas for the sound absorption of the semi-anechoic room and the reverberation room are:
[0189] A=α·S ν ……………………………………………………………………(9)
[0190] A=0.16V/T n ……………………………………………………(10)
[0191]
[0192]
[0193]
[0194]
[0195] L WA ref,atm(50) =L WA(50) +C 1 +C 2 ……………………………………………(15)
[0196]
[0197]
[0198] Where:
[0199] ——A-weighted cumulative percentage time average sound pressure level average value of the water inlet noise of the inlet valve measured on the parallelepiped measurement surface during a specific replenishment period, in decibels (dB);
[0200] L′ pAi(ST)(50) ——A-weighted cumulative percentage time-average sound pressure level of the water inlet noise of the inlet valve measured at the position of the i-th microphone on the parallelepiped measurement surface during a specific water replenishment period, in decibels (dB);
[0201] N M ——The number of parallelepiped measurement surface microphone positions;
[0202] ——A-weighted cumulative percentage time average sound pressure level average value of the background noise measured on the parallelepiped measuring surface during a specific replenishment period, in decibels (dB);
[0203] L pAi(B)(50) ——A-weighted cumulative percentage time-average sound pressure level of background noise measured at the position of the i-th microphone on the parallelepiped measurement surface during a specific replenishment period, in decibels (dB);
[0204] K 1A ——Background noise correction value;
[0205] K 2A ——Test environment correction value;
[0206] S——The area of the parallelepiped measuring surface, in square meters (m 2 );
[0207] A——The equivalent sound absorption area of the room at 1kHz frequency in the test room, in square meters (m 2 );
[0208] α——A-weighted average sound absorption coefficient of the surface of the test room, see Table A.1 in GB/T 3767-2016 for the value range;
[0209] S ν ——The total area (wall, floor, ceiling) of the room boundary of the test room, in square meters (m 2 );
[0210] V——The volume of the test room, in cubic meters (m 3 );
[0211] T n ——The measured A-weighted or frequency band reverberation time, in seconds (s);
[0212] ——A weighted cumulative percentage time average sound pressure level of the water inlet noise of the inlet valve sample measured by the parallelepiped measurement surface method during a specific replenishment period, in decibels (dB);
[0213] L WA(50) ——Under the meteorological conditions at the time and location of the test, the influent noise A-weighted cumulative percentage sound power level measured by the parallelepiped measurement surface method for each inlet valve sample in a specific replenishing period, in decibels (dB);
[0214] S 0 =1m 2;
[0215] C 1 ——A function of the characteristic impedance of the air under the meteorological conditions at the test time and place;
[0216] C 2 ——Convert the actual sound power under the meteorological conditions relative to the test time and location into the radiation impedance correction value of the sound power under the standard meteorological conditions;
[0217] p s ——Atmospheric pressure at the test time and location, in kilopascals (kPa);
[0218] p s,0 ——Standard atmospheric pressure, 101.325kPa;
[0219] θ——The air temperature at the test time and location, in degrees Celsius (℃);
[0220] θ 0 =314K;
[0221] θ 1 =296K;
[0222] L WA ref,atm(50) ——Under standard meteorological conditions with atmospheric pressure of 101.325kPa and temperature of 23.0℃, the A-weighted cumulative percentage sound power level of the water inlet noise of each inlet valve sample, in decibels (dB);
[0223] ——The average value of the A-weighted cumulative percentage sound power level of the water inlet noise of each group of inlet valve samples, in decibels (dB);
[0224] L WA(50)1 , L WA(50)2 , L WA(50)3 ——A-weighted cumulative percentage sound power level of the water inlet noise of each group of three inlet valve samples, in decibels (dB);
[0225] ——Under standard meteorological conditions with atmospheric pressure of 101.325kPa and temperature of 23.0℃, the average value of the A-weighted cumulative percentage sound power level of the water inlet noise of each group of inlet valve samples, in decibels (dB);
[0226] L WA ref,atm(50)1 , L WA ref,atm(50)2 , L WA ref,atm(50)3 ——Under standard meteorological conditions of atmospheric pressure 101.325kPa and temperature of 23.0℃, the A-weighted cumulative percentage sound power level of the water inlet noise of each group of inlet valve samples, in decibels (dB).
[0227] 4.2 Data rounding requirements: A-weighted cumulative percentage time average sound pressure level L′ of the water inlet noise and background noise of the toilet tank inlet valve pAi(ST)(50) And L pAi(B)(50) The measurement result retains one significant digit after the decimal point and its mean value with And the A-weighted cumulative percentage sound power level L WA(50) The calculation result of is an integer.
[0228] 4.3 Measurement Uncertainty: This patented method stipulates the repeatability standard deviation σ of the measurement result of the time average sound pressure level of the water inlet valve of the toilet tank on the parallelepiped measurement surface A weighted cumulative percentage omc The upper limit is not more than 1.5dB. With reference to the relevant content in the standard GB/T 3767-2016, during a complete replenishment cycle, the same sound level meter is used by the same experimenter to select the same sample of the same toilet tank inlet valve at the same installation position. A-weighted cumulative percentage time average sound pressure level average value on a parallelepiped measurement surface or Perform 6 repetitive measurements (for each repetitive measurement, the inlet valve sample must be reinstalled and adjusted in position), and the measurement results are corrected for background noise. Repeatability standard deviation σ omc The calculation formula is:
[0229]
[0230] Where:
[0231] ——The average value of the A-weighted cumulative percentage time average sound pressure level on the parallelepiped measurement surface of the j-th repeated measurement of the water inlet noise of the toilet tank inlet valve and corrected by the background noise;
[0232] ——The arithmetic average sound pressure level calculated from all repeated measurements.
[0233] (5) Performance judgment
[0234] 5.1 According to the requirements of national environmental protection regulations and related product standards, the following classification criteria are adopted:
[0235] In order to have very low water noise and excellent environmental performance;
[0236] In order to have low water noise and good environmental performance;
[0237] In order to have lower water inlet noise and better environmental performance;
[0238] In order to wash with high noise and poor environmental protection performance;
[0239] For washing, the noise is very high and the environmental performance is poor.
[0240] 5.2 When a certain sample enters water noise A weighted cumulative percentage sound power level L WA(50) More than this group of 3 samples influent noise A weighted cumulative percentage sound power level L WA(50) Arithmetic mean At 10%, it is necessary to re-extract a set of samples to repeat the experiment; calculate the A-weighted equivalent sound level of the sound level meter under the established dynamic pressure for the two sets of inlet valve samples before and after the calculation. The influent noise measured by the hexahedron measurement surface method A weighted cumulative percentage sound power level L WA(50) Arithmetic mean If a certain sample enters water noise A weighted cumulative percentage sound power level L WA(50) Greater than these two groups of 6 samples influent noise A weighted cumulative percentage sound power level L WA(50) Arithmetic mean 10% of the value, then discard; take the remaining water inlet valve sample inlet noise A to weight the cumulative percentage sound power level L WA(50) Arithmetic mean of As the evaluation index of the water inlet noise of the water tank inlet valve of this group of toilets.
[0241] The test facilities, equipment and test equipment used in this embodiment:
[0242] (1) Test facility
[0243] Semi-anechoic room: the net size of the indoor building is 9.8m×7.3m×5.9m, the effective space size after installing the sound-absorbing wedge is 7.8m×5.3m×4.9m, and the effective volume is 203m 3 , The effective use area is 41m 2. The tile floor is used as a single reflecting plane, and there are no other fixed facilities except for the corresponding water supply/drainage pipes and air conditioners; when the laboratory is in normal operation and there is no abnormal interference around, the indoor background noise is lower than 14.1dB(A); The expanded uncertainty of the sound pressure level measurement result is U 95 =(0.4~1.0)dB, k=2.
[0244] (2) Test equipment and equipment
[0245] 2.1 Sound level meter: produced by Japanese Rion Corporation, model NA-28, which can measure equivalent continuous sound pressure L eq , Performance meets GB/T 3785 type 1 integral sound level meter regulations, filter meets GB 3241 requirements; noise analyzer preamplifier sensitivity is -27dB±2dB, A-weighted linear operation range is 25dB~130dB, peak sound level The upper limit of measurement is 143dB, the maximum value of A-weighted inherent noise is 17dB, the measurement frequency range is 10Hz~20kHz, and the sampling period is 15.6ms. Before each measurement, a sound calibrator with an accuracy of ±0.1dB is used to select 100Hz, 300Hz, 500Hz, 700Hz, 900Hz, 1000Hz and other points within the test frequency range to perform overall calibration of the relevant noise measurement system.
[0246] Uncertainty of sound pressure level U=0.4dB~1.0dB(k=2); Uncertainty of sound pressure level at reference frequency U=0.07dB(k=2); Uncertainty of calibration result is U=1.0dB( k=2).
[0247] 2.2 Sound calibrator: produced by Yiou Instrument Equipment Co., Ltd., model AWA6221A, used for absolute sound pressure calibration of sound level meters. The acoustic performance meets the accuracy requirements of GB/T 15173 in level 1; the nominal sound pressure level is 94dB and 114dB (based on 20μPa), the applicable frequency range is 1kHz~5Hz, the sound pressure level accuracy is ±0.2dB(23℃) and ±0.3dB(-10℃~50℃), the total harmonic distortion at 94dB is ≤1 %.
[0248] 2.3 Ruler: steel ruler and square ruler with 1mm graduation.
[0249] 2.4 Thermometer: the range is 0℃ The graduation value is 0.2°C.
[0250] 2.5 Empty box barometer: The measuring range is 800hPa~1060hPa, and the maximum allowable error of indication is ±1.0hPa.
[0251] 2.6 Stopwatch: The accuracy is 0.01s.
[0252] 2.7 Tripod: made of carbon fiber or aluminum alloy, with a load-bearing capacity of more than 10kg, with a maximum height of 2.0m including the head.
[0253] The detection data and result calculation of this embodiment:
[0254] In the semi-anechoic room, the parallelepiped measurement surface method is used to test the water inlet noise of the water inlet valve sample in the flushing tank installed not close to any wall. The relevant test data and result evaluation are shown in Table 4.
[0255] Table 4 Water inlet valve noise detection data (a parallelepiped measuring surface method with a reflecting plane)
[0256]
[0257]
[0258] The above are only the embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent transformations made by using the contents of the description and drawings of the present invention, or directly or indirectly applied to other related technical fields, are included in Within the scope of patent protection of the present invention.
