CN112781846A - Method for testing pressure drop and airflow regeneration noise of fireproof door and method for detecting fireproof door - Google Patents
Method for testing pressure drop and airflow regeneration noise of fireproof door and method for detecting fireproof door Download PDFInfo
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Abstract
The application provides a method for testing pressure drop and airflow regeneration noise of a fireproof door and a method for detecting the fireproof door. The method for testing the pressure drop of the fireproof door and the airflow regeneration noise comprises the following steps: ventilating airflow with preset ventilation volume is introduced into the sound source chamber through the ventilation pipeline, wherein the ventilation volume of the ventilation airflow is equal to the ventilation volume passing through the fireproof door, and the sound source chamber is communicated with the ventilation pipeline; measuring 3 sound pressure level at preset radius from the center of the ventilation grating in a sound source chamber, and calculating the sound power level L entering the ventilation gratingw，1(ii) a The sound source chamber is communicated with the receiving chamber through a ventilation grating; the sound pressure level is measured at each location within the receiving chamber. The method for testing the pressure drop and the airflow regeneration noise of the fireproof door avoids the problem that the traditional fireproof door has larger parameter test result and is misjudged as a defective product, further reduces the defective rate of the fireproof door, and simultaneously enables the qualification test result of the fireproof door to be more in line with the real qualification test resultThe actual use requirements.
Description
Technical Field
The invention relates to the technical field of fireproof door performance testing, in particular to a method for testing pressure drop and airflow regenerative noise of a fireproof door and a fireproof door detection method.
Background
The fireproof door is a door capable of meeting the requirements of fire resistance stability, integrity and heat insulation within a certain time, has the functions of a common door, and also has the functions of preventing fire from spreading and flue gas from spreading, and can prevent the fire from spreading within a certain time to ensure personnel evacuation. It is a fire-proof partition with certain fire resistance, which is arranged in fire-proof subareas, evacuation staircases, vertical shafts and the like.
It will be appreciated that fire doors normally meet ventilation requirements, while also meeting certain sound insulation requirements, such as the standard requirements for fire door noise reproduction. Therefore, before the fireproof door leaves the factory, corresponding parameter tests including a pressure drop test, an airflow regeneration noise test and the like are required to be carried out on the fireproof door so as to judge whether the fireproof door meets the requirements or not. And when the testing parameter of one of the pressure drop test and the airflow regeneration noise is larger than the preset value, judging that the fireproof door is unqualified.
However, the traditional pressure drop test and airflow regeneration noise test parameters of the fire door are only tested in one test pipeline, which is completely different from the actual use environment of the fire door, so that the parameter test result of the fire door is larger, and thus, part of qualified fire door products are possibly misjudged as unqualified fire door products during quality inspection, and the defective rate of the fire door is higher.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a method for testing the pressure drop and airflow regeneration noise of a fireproof door and a method for detecting the fireproof door, wherein the fireproof door has low defective rate.
The purpose of the invention is realized by the following technical scheme:
a method for testing pressure drop of a fire door and airflow regeneration noise comprises the following steps:
ventilating airflow with preset ventilation quantity is introduced into the sound source chamber through the ventilating pipeline, wherein the ventilation quantity of the ventilating airflow is equal to the ventilation quantity of the fireproof door, and the sound source chamber is communicated with the ventilating pipeline;
measuring the distance from the center of the ventilation grating in the sound source chamber by 3 sound pressure levels with preset radius, and calculating the sound pressure level entering the ventilation gratingSound power level Lw，1(ii) a The sound source chamber is communicated with the receiving chamber through the ventilation grating;
measuring sound pressure levels at various locations within the receiving chamber, respectively;
measuring reverberation time of the receiving chamber, and calculating total sound power level L emitted by the ventilation fence according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2；
Calculating the sound power level L of the airflow regeneration noise of the ventilation grating according to a background correction methodw，reg；
Simultaneously measuring the static pressure values of the sound source chamber and the receiving chamber;
and (3) subtracting the static pressure value of the sound source chamber from the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door, wherein the delta P is Ps1-Ps2Wherein the static pressure value of the sound source chamber is Ps1The static pressure value of the receiving chamber is Ps2。
In one embodiment, the predetermined ventilation amount is 220m3/h～434m3/h。
In one embodiment, the step of introducing the ventilation airflow with the predetermined ventilation volume into the sound source chamber through the ventilation pipeline specifically comprises the following steps:
and a ventilation system is adopted to introduce ventilation airflow with preset ventilation quantity into the sound source chamber through a ventilation pipeline.
In one embodiment, the ventilation system is muffled.
In one embodiment, the predetermined ventilation volume of the input ventilation air flow of the ventilation system is adjustable in magnitude.
In one embodiment, the preset radius is 0.8m to 1.2 m.
In one embodiment, the sound source chamber is a saturn reverberation chamber.
In one embodiment, the receiving chamber is a starfish reverberation chamber.
In one embodiment, a partition space is arranged between the sound source chamber and the receiving chamber, and the ventilation grid part is positioned in the partition space.
A method for detecting a fire door, comprising the method for testing pressure drop and airflow regeneration noise of a fire door according to any of the embodiments, wherein after the step of obtaining the pressure drop difference Δ P of the fire door by subtracting the static pressure value of the sound source chamber from the static pressure value of the receiving chamber, the method for detecting a fire door further comprises:
regenerating the air flow to a noise power level Lw，regSubtracting the preset airflow regeneration noise value of the fireproof door to obtain aLw，reg(ii) a If aLw，regIf the absolute value of the fire door is less than or equal to the preset noise threshold value, the fire door is qualified; otherwise, the fireproof door is unqualified;
subtracting the pressure drop difference delta P of the fireproof door from the preset pressure drop difference value of the fireproof door to obtain a delta P; if the absolute value of a delta P is smaller than or equal to a preset pressure drop threshold value, the fireproof door is qualified; otherwise, the fireproof door is unqualified.
Compared with the prior art, the invention has at least the following advantages:
1. firstly, ventilating airflow with preset ventilation quantity is introduced into a sound source chamber through a ventilating pipeline so as to simulate the ventilation quantity in the actual use process of a fireproof door; then, the 3-point sound pressure level of the center of the ventilation grating with the preset radius is measured in the sound source chamber, and the sound power level L entering the ventilation grating is calculatedw，1(ii) a Then, respectively measuring the sound pressure level of each position in the receiving chamber; then measuring the reverberation time of the receiving chamber to correct the sound absorption characteristic of the receiving chamber, and calculating the total sound power level L emitted by the ventilation grating according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2(ii) a Then calculating the sound power level L of the airflow regeneration noise of the ventilation grating according to a background correction methodw，reg(ii) a Then measuring the static pressure values of the sound source chamber and the receiving chamber simultaneously; finally, the static pressure value of the sound source chamber is differed with the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door; thus, the noise sound power level L is reproduced according to the air flow of the ventilation fencew，regAnd the difference value between the pressure drop difference delta P of the fireproof door and the corresponding preset numerical valueWhether it is less than or equal to the corresponding preset threshold value, if the air flow regeneration noise sound power level L of the ventilation gratingw，regOr the difference value between one of the pressure drop differences delta P of the fireproof door and the corresponding preset value is larger than the corresponding preset threshold value, and the fireproof door is judged to be unqualified;
2. whether the fireproof door is qualified or not is judged and detected through the numerical value measured by the method for testing the pressure drop and the airflow regeneration noise of the fireproof door, so that the test numerical value of the pressure drop and the airflow regeneration noise of the fireproof door is closer to the actual use condition, the problem that the traditional fireproof door is misjudged to be a defective product due to a larger parameter test result is avoided, the defective rate of the fireproof door is reduced, and meanwhile, the qualification detection result of the fireproof door is more in line with the actual use requirement.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
FIG. 1 is a schematic flow chart illustrating a method for testing fire door pressure drop and airflow noise regeneration in one embodiment;
FIG. 2 is a diagram of a test model of a method for testing fire door pressure drop and airflow noise regeneration in one embodiment;
FIG. 3 is a schematic diagram of a fitting of test data to a fire door using a method for testing fire door pressure drop and airflow noise regeneration in an embodiment.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a test method for preventing pressure drop of a fire door and airflow regenerative noise, which comprises the following steps: ventilating airflow with preset ventilation quantity is introduced into the sound source chamber through the ventilating pipeline, wherein the ventilation quantity of the ventilating airflow is equal to the ventilation quantity of the fireproof door, and the sound source chamber is communicated with the ventilating pipeline; measuring the distance from the center of the ventilation grating to the sound source chamber by 3 sound pressure levels with preset radius, and calculating the sound power level L entering the ventilation gratingw，1(ii) a The sound source chamber is communicated with the receiving chamber through the ventilation grating; measuring sound pressure levels at various locations within the receiving chamber, respectively; measuring reverberation time of the receiving chamber, and calculating total sound power level L emitted by the ventilation fence according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2(ii) a Calculating the sound power level L of the airflow regeneration noise of the ventilation grating according to a background correction methodw，reg(ii) a Simultaneously measuring the static pressure values of the sound source chamber and the receiving chamber; and (3) subtracting the static pressure value of the sound source chamber from the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door, wherein the delta P is Ps1-Ps2Wherein the sound sourceStatic pressure value of the chamber being Ps1The static pressure value of the receiving chamber is Ps2。
According to the method for testing the pressure drop and the airflow regeneration noise of the fireproof door, firstly, ventilation airflow with preset ventilation volume is introduced into a sound source chamber through a ventilation pipeline so as to simulate the ventilation volume in the actual use process of the fireproof door; then, the 3-point sound pressure level of the center of the ventilation grating with the preset radius is measured in the sound source chamber, and the sound power level L entering the ventilation grating is calculatedw，1(ii) a Then, respectively measuring the sound pressure level of each position in the receiving chamber; then measuring the reverberation time of the receiving chamber, and calculating the total sound power level L emitted by the ventilation grating according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2(ii) a Then calculating the sound power level L of the airflow regeneration noise of the ventilation grating according to a background correction methodw，reg(ii) a Then measuring the static pressure values of the sound source chamber and the receiving chamber simultaneously; finally, the static pressure value of the sound source chamber is differed with the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door; thus, the noise sound power level L is reproduced according to the air flow of the ventilation fencew，regAnd whether the difference value between the pressure drop difference delta P of the fireproof door and the corresponding preset value is less than or equal to the corresponding preset threshold value or not is judged, and if the difference value is less than or equal to the corresponding preset threshold value, the sound power level L of the airflow regeneration noise of the ventilation gratingw，regOr the difference value between one of the pressure drop differences delta P of the fireproof door and the corresponding preset value is larger than the corresponding preset threshold value, and the fireproof door is judged to be unqualified; whether the fireproof door is qualified or not is judged and detected through the numerical value measured by the method for testing the pressure drop and the airflow regeneration noise of the fireproof door, so that the test numerical value of the pressure drop and the airflow regeneration noise of the fireproof door is closer to the actual use condition, the problem that the traditional fireproof door is misjudged to be a defective product due to a larger parameter test result is avoided, the defective rate of the fireproof door is reduced, and meanwhile, the qualification detection result of the fireproof door is more in line with the actual use requirement.
As shown in fig. 1, the method for testing the pressure drop and the airflow regeneration noise of the fire door according to the embodiment is used for detecting the pressure drop of the fire door and the magnitude of the parameter value of the airflow regeneration noise, so as to determine whether the fire door is qualified. Specifically, the method for testing the pressure drop of the fireproof door and the airflow regeneration noise comprises the following steps of:
s101, the ventilation air current of predetermined air volume is let in to the sound source indoor through ventilation pipe, wherein, the air volume of ventilation air current equals to pass through prevent fire door' S air volume, the sound source room with ventilation pipe intercommunication.
Referring to fig. 2, in this embodiment, the sound source chamber 300 is communicated with the ventilation duct 200, and the ventilation airflow with a predetermined ventilation volume is introduced into the sound source chamber through the ventilation duct, wherein the ventilation volume of the ventilation airflow is equal to the ventilation volume of the fireproof door, so that the ventilation volume of the ventilation airflow simulates the ventilation volume of the fireproof door, and further the ventilation volume of the ventilation airflow coincides with the ventilation volume of the actual use environment of the fireproof door.
S103, measuring the distance from the center of the ventilation grating to the sound source chamber by 3-point sound pressure level with a preset radius, and calculating the sound power level L entering the ventilation gratingw，1. The sound source chamber is communicated with the receiving chamber through the ventilation grating.
As shown in fig. 2, in the present embodiment, the sound source chamber 300 communicates with the receiving chamber 400 through a ventilation grill 500. Measuring a 3-point sound pressure level SPL in the sound source chamber at a preset radius from the center of the air grid1In dB, the sound pressure level SPL is measured at 3 points 310 of the circular arc profile of a predetermined radius from the center of the air grid in the sound source room1In dB. The sound pressure level SPL1Obtaining SPL through A-weighted conversion1AIn dBA. By SPL1AAnd calculating the value of the ventilation area A of the fireproof door to calculate the sound power level L entering the ventilation fencew，1. According to the sound power level Lw，1The calculation formula of (2): l isw，1＝SPL1A+10log10 AThus, the sound power level L entering the ventilation grating is calculated according to the sound pressure level of the 3-point soundw，1. Specifically, the 3 position points are arranged at intervals, that is, the distance between two adjacent position points is equal.
And S105, respectively measuring the sound pressure level of each position in the receiving chamber.
In this embodiment, the sound source chamber and the receiving chamber are both mixedAnd (6) sounding the chamber. Sound pressure level SPL for multiple location points in a receiving room2The measurement of (2) makes the measurement accuracy of the sound pressure level in the receiving chamber higher. In particular, sound pressure levels SPL are performed for six location points within the receiving room2The measurement of (2). Sound pressure level SPL2In dB. The sound pressure level SPL2Obtaining SPL through A-weighted conversion2AIn dBA. In one embodiment, before the step S105 of measuring the sound pressure level of each position in the receiving chamber respectively, the testing method further comprises: microphones are set at a plurality of positions in the receiving chamber. During testing, noise at each position point is input through the microphones at a plurality of position points in the receiving chamber, so that the noise is amplified and collected, and the collection precision of the noise is improved.
Further, after the step of measuring the sound pressure levels of the respective locations within the receiving chamber, respectively, the testing method further comprises: firstly, the background noise correction parameters BG corresponding to each position in the receiving chamber are respectively measured, and the unit is dB. Secondly, converting the background noise correction parameter BG through A weighting to obtain BGAIn dBA.
Further, converting the background noise correction parameter BG by A weight to obtain BGAAfter the step (b), the test method further comprises: the sound pressure level SPL of the corresponding position in the receiving chamber is measured by the background noise correction parameter BG after the A weight conversion2ACorrecting to obtain the corrected sound pressure level SPL of the corresponding position in the receiving chamber2A'. In the present embodiment, the sound pressure level SPL2AFor mixed sound pressure level, SPL1AThe correction method is specifically as follows for the sound pressure level of the background sound: if SPL2A-SPL1AGreater than or equal to 15, the corrected sound pressure level SPL of the corresponding position in the receiving chamber2AEqual to SPL2A(ii) a If SPL2A-SPL1AWhen the sound pressure level SPL is greater than or equal to 6 and less than 15, the corrected sound pressure level SPL at the corresponding position in the receiving chamber2AIs equal to
If SPL2A-SPL1ALess than 6Then, the corrected sound pressure level SPL of the corresponding position in the receiving chamber2AEqual to SPL2A-1.26。
S107, measuring the reverberation time of the receiving chamber, and calculating the total sound power level L emitted by the ventilation grate according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2。
In this embodiment, the reverberation time RT of the receiving chamber is measured, and the total sound power level L emitted by the ventilation grating is calculated from the sound pressure level and the reverberation time at each position in the receiving chamberw，2. According to total sound power level Lw，2The calculation formula of (2): l isw，2＝SPL2A’+10lg(0.16*VReceiving chamber/RT), wherein VReceiving chamberIs the volume of the receiving chamber.
S109, calculating the airflow regeneration noise sound power level L of the ventilation grating according to a background correction methodw，reg。
In this embodiment, the airflow regeneration noise sound power level L of the ventilation fence is calculated according to a background correction methodw，reg. The total noise emitted by the ventilation grating is the sum of the background noise of the sound source chamber and the airflow regeneration noise, so the airflow regeneration noise sound power level L of the ventilation grating is calculated according to a background correction methodw，regThe method specifically comprises the following steps: if L isw，2-Lw，1Greater than or equal to 15, the airflow regeneration noise sound power level L of the ventilation fencew，regIs equal to Lw，1(ii) a If L isw，2-Lw，1When the sound power level is more than or equal to 6 and less than 15, the sound power level L of the airflow regeneration noise of the ventilation gratingw，regIs equal to
If L isw，2-Lw，1When the sound power level is less than 6, the sound power level L of the airflow regeneration noise of the ventilation gratingw，regIs equal to Lw，2-1.26。
Further, the output is adjusted for a plurality of times within the frequency range of the sound source to obtain the airflow regeneration noise sound power level L of a plurality of different ventilation gridsw，regAnd (4) data. In the present embodiment, the sound source frequency range is 50Hz to 10000 Hz.
Further, the sound power level L of the airflow regeneration noise measured for each frequency of 50 Hz-10000 Hzw，regData were logarithmically summed:
to obtain a single Lw，regThe numerical value is the airflow regeneration noise of the ventilation grating corresponding to the air quantity, namely the airflow regeneration noise of the fireproof door corresponding to the air quantity.
And S111, simultaneously measuring the static pressure values of the sound source chamber and the receiving chamber.
S113, subtracting the static pressure value of the sound source chamber from the static pressure value of the receiving chamber to obtain a pressure drop difference delta P of the fireproof door, wherein the delta P is Ps1-Ps2Wherein the static pressure value of the sound source chamber is Ps1The static pressure value of the receiving chamber is Ps2。
In this embodiment, the static pressure value of the sound source chamber and the static pressure value of the receiving chamber are differentiated to obtain the pressure loss of the ventilation grid, that is, the pressure drop difference Δ P of the fire door, where Δ P is Ps1-Ps2Wherein the static pressure value of the sound source chamber is Ps1The static pressure value of the receiving chamber is Ps2. In this embodiment, the unit of the static pressure value of the sound source chamber and the unit of the static pressure value of the receiving chamber are both Pa, and the unit of the pressure drop difference Δ P is also Pa.
According to the method for testing the pressure drop and the airflow regeneration noise of the fireproof door, firstly, ventilation airflow with preset ventilation volume is introduced into a sound source chamber through a ventilation pipeline so as to simulate the ventilation volume in the actual use process of the fireproof door; then, the 3-point sound pressure level of the center of the ventilation grating with the preset radius is measured in the sound source chamber, and the sound power level L entering the ventilation grating is calculatedw，1(ii) a Then, respectively measuring the sound pressure level of each position in the receiving chamber; then measuring the reverberation time of the receiving chamber, and calculating the total sound power level L emitted by the ventilation grating according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2(ii) a Then calculating according to the background correction methodAirflow regeneration noise sound power level L of air outlet grillew，reg(ii) a Then measuring the static pressure values of the sound source chamber and the receiving chamber simultaneously; finally, the static pressure value of the sound source chamber is differed with the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door; thus, the noise sound power level L is reproduced according to the air flow of the ventilation fencew，regAnd whether the difference value between the pressure drop difference delta P of the fireproof door and the corresponding preset value is less than or equal to the corresponding preset threshold value or not is judged, and if the difference value is less than or equal to the corresponding preset threshold value, the sound power level L of the airflow regeneration noise of the ventilation gratingw，regOr the difference value between one of the pressure drop differences delta P of the fireproof door and the corresponding preset value is larger than the corresponding preset threshold value, and the fireproof door is judged to be unqualified; whether the fireproof door is qualified or not is judged and detected through the numerical value measured by the method for testing the pressure drop and the airflow regeneration noise of the fireproof door, so that the test numerical value of the pressure drop and the airflow regeneration noise of the fireproof door is closer to the actual use condition, the problem that the traditional fireproof door is misjudged to be a defective product due to a larger parameter test result is avoided, the defective rate of the fireproof door is reduced, and meanwhile, the qualification detection result of the fireproof door is more in line with the actual use requirement.
In one embodiment, the predetermined ventilation amount is 220m3/h～434m3And h, enabling the preset ventilation quantity to be adaptive to the ventilation requirement of the door body. In this embodiment, the predetermined ventilation amount is 226m3/h、276m3/h、325m3/h、378m3H or 434m3H is used as the reference value. It is understood that in other embodiments, the predetermined ventilation amount is not limited to 220m for different door bodies3/h～434m3And/h, other numerical values can be used.
In one embodiment, the step of introducing the ventilation airflow with the predetermined ventilation volume into the sound source chamber through the ventilation pipeline specifically comprises the following steps: and a ventilation system is adopted to introduce ventilation airflow with preset ventilation quantity into the sound source chamber through a ventilation pipeline. In one embodiment, the preset ventilation volume of the ventilation airflow input by the ventilation system is adjustable to simulate different preset ventilation volumes of the ventilation airflow introduced into the sound source chamber, so that the test of a fire door with different ventilation volume requirements is met, and the applicability of the test method of the pressure drop of the fire door and the airflow regeneration noise is improved.
Furthermore, the ventilation system comprises a fan body and a speed regulator, wherein the fan body is connected with the power output end of the speed regulator, so that the output air quantity of the fan body is adjustable. In this embodiment, the air-out end and the air pipe intercommunication of fan body make ventilation system pass through air pipe and let in the ventilation air current, and the size of the predetermined draft of the ventilation air current that lets in to the sound source indoor is adjustable.
In one embodiment, the ventilation system is subjected to noise elimination treatment, so that the ventilation system is in a mute state by introducing ventilation air flow through the ventilation pipeline, the mute effect is further achieved in the ventilation system introduced through the ventilation pipeline, and the test result of the fire door is prevented from being influenced by the noise of the ventilation air flow introduced into the sound source chamber through the ventilation pipeline at a preset ventilation quantity. It can be understood that after the ventilation system is subjected to noise elimination treatment, the sound source chamber can achieve the mute ventilation effect.
In one embodiment, the preset radius is 0.8-1.2 m, so that the sound pressure level measured in the sound source chamber meets the actual use condition of the fire door. In this embodiment, the preset radius is 1m, so that the sound pressure level measured in the sound source chamber meets not only the actual use condition of the fire door, but also the requirement of a noise test.
In one embodiment, the sound source chamber is a saturn reverberation chamber. In one embodiment, the receiving chamber is a starfish reverberation chamber, and the structure of the sound source chamber is different from that of the receiving chamber so as to meet the test requirements of different sound power levels.
In one embodiment, a partition space is arranged between the sound source chamber and the receiving chamber, and the ventilation grating part is positioned in the partition space so that the sound source chamber is communicated with the receiving chamber. In this embodiment, the outer wall of the sound source chamber is separated from the outer wall of the receiving chamber by a partition space, so that the noise in the sound source chamber and the noise in the receiving chamber are prevented from influencing or interfering with each other, and the pressure drop of the fireproof door and the testing accuracy of airflow regeneration noise are improved.
As shown in fig. 2, further, before the step of introducing the ventilation airflow with the predetermined ventilation volume into the sound source chamber through the ventilation duct, the method for testing the fire door pressure drop and the airflow regeneration noise further includes: and (4) testing the component. In this embodiment, the test model 10 includes a ventilation system 100, a ventilation duct 200, a sound source chamber 300, a receiving chamber 400, and a ventilation grill 500, where the ventilation system is communicated with the sound source chamber through the ventilation duct, so that air around the test model can enter the sound source chamber through the ventilation system and the ventilation duct. The sound source chamber is communicated with the receiving chamber through a ventilation grating. A partition space 350 is arranged between the sound source chamber and the receiving chamber, and the ventilation grid part is positioned in the partition space.
In one embodiment, the test data obtained by the method for testing the pressure drop of the fire door and the airflow regeneration noise of the fire door in this embodiment are shown in the following table, wherein the predetermined ventilation volume is 226m3/h、276m3/h、325m3/h、378m3H or 434m3/h。
As shown in FIG. 3, the sound power level L of the airflow regenerative noise of the fire door is obtained by fitting and linear regression according to the data in the table abovew，reg(the letter y is used for fitting) and Log (Q) are given by the following formula: 12.881log (q) + 5.6467.
It can be understood that for different fireproof doors, the corresponding parameters such as the sound power level of the airflow regenerative noise, the pressure drop and the like are different, and the parameters can be set according to requirements.
The application also provides a method for detecting the fireproof door, which comprises the method for testing the pressure drop and the airflow regeneration noise of the fireproof door in any embodiment. After the step of obtaining the pressure drop difference Δ P of the fire door by subtracting the static pressure value of the sound source chamber from the static pressure value of the receiving chamber, the fire door detection method further includes:
s115, regenerating the noise sound power level L of the airfloww，regAnd subtracting the preset airflow regeneration noise value of the fireproof door to obtainTo aLw，reg(ii) a If aLw，regIf the absolute value of the fire door is less than or equal to the preset noise threshold value, the fire door is qualified; otherwise, the fireproof door is unqualified.
S117, subtracting the pressure drop difference delta P of the fireproof door from the preset pressure drop difference value of the fireproof door to obtain a delta P; if the absolute value of a delta P is smaller than or equal to a preset pressure drop threshold value, the fireproof door is qualified; otherwise, the fireproof door is unqualified.
Compared with the prior art, the invention has at least the following advantages:
1. firstly, ventilating airflow with preset ventilation quantity is introduced into a sound source chamber through a ventilating pipeline so as to simulate the ventilation quantity in the actual use process of a fireproof door; then, the 3-point sound pressure level of the center of the ventilation grating with the preset radius is measured in the sound source chamber, and the sound power level L entering the ventilation grating is calculatedw，1(ii) a Then, respectively measuring the sound pressure level of each position in the receiving chamber; then measuring the reverberation time of the receiving chamber, and calculating the total sound power level L emitted by the ventilation grating according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2(ii) a Then calculating the sound power level L of the airflow regeneration noise of the ventilation grating according to a background correction methodw，reg(ii) a Then measuring the static pressure values of the sound source chamber and the receiving chamber simultaneously; finally, the static pressure value of the sound source chamber is differed with the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door; thus, the noise sound power level L is reproduced according to the air flow of the ventilation fencew，regAnd whether the difference value between the pressure drop difference delta P of the fireproof door and the corresponding preset value is less than or equal to the corresponding preset threshold value or not is judged, and if the difference value is less than or equal to the corresponding preset threshold value, the sound power level L of the airflow regeneration noise of the ventilation gratingw，regOr the difference value between one of the pressure drop differences delta P of the fireproof door and the corresponding preset value is larger than the corresponding preset threshold value, and the fireproof door is judged to be unqualified;
2. whether the fireproof door is qualified or not is judged and detected through the numerical value measured by the method for testing the pressure drop and the airflow regeneration noise of the fireproof door, so that the test numerical value of the pressure drop and the airflow regeneration noise of the fireproof door is closer to the actual use condition, the problem that the traditional fireproof door is misjudged to be a defective product due to a larger parameter test result is avoided, the defective rate of the fireproof door is reduced, and meanwhile, the qualification detection result of the fireproof door is more in line with the actual use requirement.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A method for testing the pressure drop of a fireproof door and the airflow regeneration noise is characterized by comprising the following steps:
ventilating airflow with preset ventilation quantity is introduced into the sound source chamber through the ventilating pipeline, wherein the ventilation quantity of the ventilating airflow is equal to the ventilation quantity of the fireproof door, and the sound source chamber is communicated with the ventilating pipeline;
measuring the 3-point sound pressure level in the sound source chamber from the center of the ventilation grating by a preset radius, and calculating the sound power level L entering the ventilation gratingw，1(ii) a The sound source chamber is communicated with the receiving chamber through the ventilation grating;
measuring sound pressure levels at various locations within the receiving chamber, respectively;
measuring reverberation time of the receiving chamber, and calculating total sound power level L emitted by the ventilation fence according to the sound pressure level and the reverberation time of each position in the receiving chamberw，2；
Calculating the sound power level L of the airflow regeneration noise of the ventilation grating according to a background correction methodw，reg；
Simultaneously measuring the static pressure values of the sound source chamber and the receiving chamber;
and (3) subtracting the static pressure value of the sound source chamber from the static pressure value of the receiving chamber to obtain the pressure drop difference delta P of the fireproof door, wherein the delta P is Ps1-Ps2Wherein the static pressure value of the sound source chamber is Ps1Said is connected toThe static pressure value of the collecting chamber is Ps2。
2. The method for testing fire door pressure drop and airflow regeneration noise according to claim 1, wherein the predetermined ventilation volume is 220m3/h～434m3/h。
3. The method for testing the pressure drop of the fire door and the airflow regeneration noise according to claim 1 or 2, wherein the step of introducing the ventilation airflow with the preset ventilation volume into the sound source chamber through the ventilation pipeline specifically comprises the following steps:
and a ventilation system is adopted to introduce ventilation airflow with preset ventilation quantity into the sound source chamber through a ventilation pipeline.
4. The method of claim 3, further comprising silencing the ventilation system.
5. The method of claim 3, wherein the predetermined ventilation volume of the input ventilation airflow of the ventilation system is adjustable.
6. The method for testing fire door pressure drop and airflow noise regeneration according to claim 1, wherein the predetermined radius is 0.8m to 1.2 m.
7. The method of claim 1, wherein the sound source chamber is a Tustar reverberation chamber.
8. The method of claim 1, wherein the receiving chamber is a starfish reverberation chamber.
9. The method of claim 1, wherein a separation space is formed between the sound source chamber and the receiving chamber, and the ventilation grid is partially located in the separation space.
10. A fire door detection method comprising the method for testing a pressure drop and an airflow regeneration noise of a fire door according to any one of claims 1 to 9, wherein the method for testing a fire door further comprises, after the step of obtaining a pressure drop difference Δ P of the fire door by subtracting a static pressure value of the sound source chamber from a static pressure value of the receiving chamber:
regenerating the air flow to a noise power level Lw，regSubtracting the preset airflow regeneration noise value of the fireproof door to obtain aLw，reg(ii) a If aLw，regIf the absolute value of the fire door is less than or equal to the preset noise threshold value, the fire door is qualified; otherwise, the fireproof door is unqualified;
subtracting the pressure drop difference delta P of the fireproof door from the preset pressure drop difference value of the fireproof door to obtain a delta P; if the absolute value of a delta P is smaller than or equal to a preset pressure drop threshold value, the fireproof door is qualified; otherwise, the fireproof door is unqualified.
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