JPH06186984A - Sound absorbing panel and its fitting method - Google Patents

Abstract

PURPOSE:To provide the sound absorbing panel capable of surely shutting off the noises generated from various kinds of industrial equipment in a specific factory and the control room, laboratory, inspection room, etc., thereof. CONSTITUTION:This sound absorbing panel is produced from end frames 10 which consist of metallic plates shaping the end surfaces, an outer core 11 of high-density rock wool and inner core 12 of low-density rock wool which are packed as two parallel layers within these frames, an outer cover 13 of decorative plywood which is stuck and integrated to the end frames 10 and an inner cover 14 of a glass fiber sheet which is likewise fastened to the end frames 10.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used as an enclosure material for various industrial equipment in a specific factory and its control room, test room, inspection room, etc., and a sound absorbing panel for surely blocking noise generated from these, and its simple fitting. Regarding attachment method.

[0002]

2. Description of the Related Art As shown in FIG. 21, a conventional product of this type of sound absorbing panel is a mouth frame (1) of a steel plate forming a wood mouth surface and a rock wool core (2) filled as one layer inside the mouth frame.
And an outer cover (3) made of steel plate and an inner cover (4) made of punching metal, which are welded and integrated to the mouth frame (1) so as to sandwich them.

The sound absorbing panel (p) is used as an enclosing material having a single wall structure as shown in the figure, and a certain air layer (s) is interposed in the middle as shown in FIG. It may be used as an enclosing material having a double wall structure in which one pair is arranged in parallel, and it goes without saying that the latter is intended to reduce the noise blocking effect.

[0004]

However, in such a conventional product, in addition to the rock wool as the core (2), the whole product is welded and integrated from the metal material, and thus it is considerably heavy and difficult to handle. At the same time, it is impossible to replace only the core (2) that has been damaged with time due to oil and water.

In particular, when it is used as a double wall structure enclosing material, it is a troublesome work in the field such as keeping the air layer (s) constant, and it not only requires excessive labor and long time. However, the depth dimension becomes thicker by the amount of the air layer (s) interposed, and the space saving effect is also inferior.

The sound absorbing panel (p), when used not only in its single-wall structure but also in its double-wall structure, itself has only one layer of rock wool as the core (2). However, since it is covered with the steel sheet outer cover (3), it is possible to block to some extent mid- and high-frequency noise, but it is possible to secure this for low-frequency noise, which has recently been regarded as a problem. Can not be shut off.

That is, the graphs of FIGS. 23 to 25 show a conventional product having a single wall structure having a depth or thickness (w) of 50 mm (broken line in the same figure) and a pair of them through an air layer (s) of 50 mm. For the conventional double wall structure (solid line in the figure) installed in parallel, the sound pressure level measured in accordance with JIS-A-1417 "Method of measuring sound pressure level difference in the building site" at -100 dB The transmission loss is shown.

According to this, a frequency of 31.5 to 250H
The numerical value of the transmission loss in the low range of Z is low. Moreover, it is clear that the difference in height from the transmission loss value in the high frequency range of 2000 to 8000 HZ is extremely large, and it is not possible to obtain a certain high noise prevention effect over the wide frequency range. Even if the sound absorbing panel (p) is used as a double wall structure, the sound absorbing / insulating performance in the low sound range is substantially the same as that of the single wall structure, and the transmission loss value is still low.

[0009]

DISCLOSURE OF THE INVENTION The present invention is intended to improve such a problem, and as a sound absorbing panel useful for that purpose, a mouth frame of a metal plate that forms a wood mouth surface and two layers arranged in parallel inside the mouth frame. The filled high-density rock wool outer core and low-density rock wool inner core, the outer cover of the decorative plywood integrated and attached to the mouth frame, and the inner of the glass fiber sheet also fitted to the mouth frame. Characterized by consisting of a cover,

Further, as a method of fitting the retrofitted sound absorbing panel in a aligned connection state between the preinstalled sound absorbing panels which are installed in parallel as a pair of facing the mouthpieces, a dowel for insertion is inserted from one of the mouthpieces of the subsequent sound absorbing panel. Similarly, a dowel receiving key hole is formed on the other wood mouth surface in a relational state in which the small-diameter long hole portion is deviated by a certain amount to the upper position from the axis of the dowel. From the wood mouth surface, while inserting the dowel for insertion into the key hole of the retrofitted sound absorbing panel, the axis of the dovetail projecting into a corresponding state in which the axis corresponds to the dowel of the retrofitted sound absorbing panel, and on the wood mouth surface of the other pre-mounted sound absorbing panel, The key hole for receiving the dowel of the sound absorbing panel to be attached later is biased to the opposite lower position by the same amount as the small and long hole part from the axis of the dowel. Open form in relation state, the retrofit sound-absorbing panels to the mutual both tipping acoustical panel, by attaching fit as On drop from above, and is characterized in keeping the overall matching connection state.

[0011]

According to the sound absorbing panel of the present invention constructed as described above, the outer core and the inner core of the rock wool whose density changes in high and low are packed in parallel inside the mouth frame, and coat the same. Decorative plywood is used as the outer cover, and glass fiber sheet is also used as the inner cover.Thus, despite its lightweight overall single-wall structure, it is higher and more stable than the conventional double-wall structure. It exhibits excellent sound absorption and sound insulation performance and can achieve an excellent noise prevention effect especially in the low frequency band.

Further, according to the method of fitting the sound absorbing panel having the above-described structure, when the noise source is surrounded by the sound absorbing panel, a small space is generated right above the opening / closing door or the inspection window. Even if it does, the space can be packed into the aligned connection state by the sound absorbing panel attached later, and the construction work can be easily performed.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail below with reference to the drawings. FIGS. 1 and 2 show a sound absorbing panel (P) according to the present invention, and (10) has a thickness of about 2.4 mm. It is a mouth frame divided into a quadrangle from a steel plate, and forms the mouth end surface of the sound absorbing panel (P).

(11) and (12) are an outer core and an inner core, which are filled as two layers in parallel inside the mouth frame (10), the former being a high density rock wool (about 80 kg / m ² ) Nichias product name-MG Felt No. 1), while the latter is about 70 kg / m ² of low-density rock wool (Nichias product name-
MG belt No. 1), and the height difference is provided in the density. However, the thickness of each of the cores (11) and (12) is approximately 50 mm and is equally dimensioned.

Reference numeral (13) is an outer cover integrally attached to the mouth frame (10) via an adhesive or other fixing means so as to cover the outer core (11) from the outside. It consists of a melamine resin board with a thickness of 4 mm and various other types of decorative plywood, and it itself exhibits sound absorption and sound insulation properties.

Further, (14) is an inner cover which is also fitted to the mouth frame (10), and has a glass fiber sheet having a thickness of about 1.2 mm (trade name of Nippon Sheet Glass Co., Ltd.-soundproofing sheet YEM). -1801-T1), and the inner core (12) is covered with the inner core (12) in a related state as if it were a futon. Therefore, it can be peeled off from the inside of the mouth frame (10) with a hand.

The sound absorbing panel (P) having such a structure has, for example, a height (H) of about 2420 mm, a width (L) of about 1220 mm, a depth (thickness) (W) of about 11 mm.
It has been commercialized to a size of 0 mm, and several of them are shown in Fig. 3.
As suggested from the above, by connecting to the above-mentioned mating state of the kiguchi surfaces, it will be used as a surrounding material or wall material for various industrial equipment in a specific factory and its control room, test room, inspection room, etc. .

In this case, as is apparent from FIG. 4 instead of FIG. 2, the inside of the mouth frame (10) is divided into a plurality of small chambers (upper and lower chambers) by a partition bar (15) made of a steel plate welded to the steel plate. It is preferable that each small chamber (R) is subdivided into two layers of the outer core (11) and the inner core (12).

In this case, the partition bar (15) can enhance the durability of the sound absorbing panel (P), which is effective for increasing the size of the sound absorbing panel (P) and the cores (11). This is because the rock wool of (12) is also a small product, which can be handled easily and can be maintained in a stable filled state without fear of positional deviation or fluttering.

Regarding the densities of the outer core (11) and the inner core (12), the difference is not limited to the above numerical value of about 10 kg / m ² , but may be different numerical values. The thicknesses of both cores (11) and (12) can be changed differently. The steel plate forming the mouth frame (10) is also described as a typical example of the metal plate. It does not matter if the inside of the mouth frame (10) is subdivided into a plurality of small chambers (R) juxtaposed in the left-right direction by the partition bars (15).

FIGS. 7 to 20 show data of transmission loss values measured by changing sound pressure in order to confirm the sound absorbing / insulating performance of the sound absorbing panel (P) of the present invention having the above size and structure. Shows.

In the measurement, as an enveloping material using the sound absorbing panel (P) connected, 4500 mm × 4
A noise signal generator made by Rion Co., Ltd., which surrounds a cubic space of 500 mm × 2450 mm (effective height) and is installed inside, is used as a sound source to generate pink noise from the sound source, and receive it at a point 1 m away from the sound source. It measured with the sound device (A characteristic 28-130 dB).

Then, the equivalent noise level (Leg) was confirmed, and the frequency analysis was performed by the 1/3 octave band to confirm the sound absorption / insulation performance when a few maximum frequencies were generated. However, as a specification in which opening / closing doors are provided at three locations of the surrounding material and sliding doors are provided at two other locations, the degree of sealing is about 70%.

Considering the present invention based on the above data,
The transmission loss value changes from 100 dB of the sound pressure level to 120 dB as shown in FIGS.
In the low sound range of 250 HZ, it is much higher than that of the conventional products in FIGS. 23 to 25. On the contrary, as the sound pressure level becomes higher, the transmission loss values in the low sound range and the high sound range become lower on the contrary. In the present invention, the higher the sound pressure level, the higher the transmission loss value in the low sound range and the high sound range, and the difference is remarkable.

Moreover, FIGS. 10 to 12 corresponding to FIGS.
As is clear from the above, as the specifications of the surrounding material, opening / closing doors are installed in three places and sliding doors are installed in two other places respectively, and if the sealing degree is about 70%, the leech also leaks noise from these. There is no fear, and the transmission loss shows a high numerical value which is substantially uniform in each direction of 360 degrees.

Further, as is clear from FIGS. 13 to 20 showing the sound absorbing / insulating performance at a specific frequency, the transmission loss values at the specific frequency are smooth and even, and always appear as stable and high numerical values. . It is customary that the higher the sound pressure level, the lower the transmission loss value. In the case of the present invention, FIGS.
As the line graph of 0 draws an overall horizontal line, its transmission loss value is hardly reduced.

In addition, at the metal stamping machine factory of the present applicant, in actuality, the thickness of the 3 × 6 scale stamping machine--
Noise of about 115 to 122 dB was generated during processing of 3.2 mm, but this was caused by the sound absorbing panel (P) of the depth (thickness) described above, which was 4500 mm × 4500 mm ×
In addition to enclosing it in a 2500 mm (height) space, opening / closing doors were provided in three places of the surrounding material, an air-opening / closing type work piece carry-out port was provided in two places, a ventilation fan was provided in one place, and an inspection window was provided in one place. As a result of the construction experiment as a specification, 1 from the surrounding material
The average measured value at the external point at a distance of m could be reduced to about 68 dB.

At this time, the rock wool of the inner core (12) is not covered with the inner cover (14) of the glass fiber sheet but left in its exposed state. Therefore, according to the present invention which also covers it. It seems that the measured values can be further reduced by 5-10%.

In addition to such excellent sound absorption and sound insulation performance, in particular, a decorative plywood is adopted as the outer cover (13) of the mouth frame (10), and a high density rock wool outer core (11) is provided in the frame. It is considered that the two layers of the low-density rock wool inner core (12) act organically.

Moreover, the sound absorbing panel (P) of the present invention used for the above measurement has a depth (thickness) of about 110 mm, and is shown in FIG. 22 in spite of its thin single wall structure being sufficient. It can be said that it has special technical meaning and practical value in that it can achieve higher sound absorption and sound insulation effects than the conventional double wall structure.

Next, FIGS. 5 and 6 show the structure of the sound absorbing panel (P) of the present invention in which a surrounding material is constructed.
1) A method of fitting a post-installed sound absorbing panel (P3) into a matching connection state between (P2) is shown.

In both of the figures, (16) is a dowel for insertion projecting from one of the mouth faces of the mouth frame (10) of the rectangular sound absorbing panel (P3), and obviously the leg shaft portion (16a). And the large diameter head (16
b).

(17) is a sound absorbing panel (P
3) A key hole for receiving a dowel formed on the other mouth side of the mouth frame (10) of 3), which has a small diameter elongated hole portion (17a) corresponding to the leg shaft portion (16a) of the dowel (16). ,
Similarly, a large diameter circular hole (17b) corresponding to the head (16b)
It is in communication with. In that case, it is needless to say that the one mouth surface and the other wood surface are parallel to each other, and the small diameter elongated hole portion (17a) of the key hole (17) is the horizontal axis line (XX) of the dowel (16). To a certain amount (h1) from the above to the upper position.

With respect to such a retrofitted sound absorbing panel (P3), the dowel (18) for insertion into the key hole (17) of the retrofitted sound absorbing panel (P3) is provided from the mouth end surface of the one of the preinstalled sound absorbing panel (P1). ) Is projected at a height corresponding to the dowel (16) of the attached sound absorbing panel (P3) and the horizontal axis (XX).

A key hole (19) for receiving the dowel (16) of the post-installed sound absorbing panel (P3) is formed on the mouth end surface of the other front facing sound absorbing panel (P2). Moreover, the small-diameter long hole portion (19a) of the key hole (19) is aligned with the horizontal axis (X- of the dowel (16)).
It is set in a relational state in which it is biased to a lower position by a constant amount (h2) from X).

That is, the fixed amount (h2) is set equal to the fixed amount (h1), and the sound absorbing panel (P) is mounted.
The key hole (19) of 2) and the key hole (17) of the sound absorbing panel (P3) to be attached later are formed so as to be vertically inverted with respect to each other. In addition, the dowel (18) of the remaining pre-mounted sound absorbing panel (P1) and the post-mounted sound absorbing panel (P1)
It goes without saying that the dowels (16) of 3) are the same as each other.

If such a structure is adopted, when the sound absorbing panel (P) of the present invention is applied as an enclosure, the structure shown in FIG.
Even if there is a small space above and below the ceiling material at a position just above the opening / closing door (20) or the inspection window like the above, the opening / closing is performed as if the space is filled with the sound absorbing panel (P3) to be attached later. A pair of pre-mounted sound absorbing panels (P1) and (P2) sandwiching a door (20) or an inspection window can be fitted and connected in a drop-down manner from above, and the simple operation is sufficient. Instead, the post-installed sound absorbing panel (P3) can be fixed and maintained in the aligned state in which it cannot fall, as shown in FIGS. Needless to say, if the ceiling material is attached at the end, it will be completed as an enclosure material.

[0038]

As described above, the sound absorbing panel (P) of the present invention comprises the mouth frame (10) of the metal plate forming the mouth end surface and the outer layer of high density rock wool filled in two layers in parallel with the mouth frame (10). A core (11) and a low-density rock wool inner core (12), and an outer cover (1) made of decorative plywood that is attached integrally to the mouth frame (10).
3) and the inner cover (14) of the glass fiber sheet which is also fitted to the mouth frame (10), an excellent noise prevention effect can be achieved.

That is, in the case of the present invention, the sound absorbing panel (P)
The mouth frame (10) of the is filled with a high-density rock wool outer core (11) and a low-density rock wool inner core (12) in parallel, and the outer side of the decorative plywood from the outside. The inner cover (14) of the glass fiber sheet from the remaining inside by the cover (13)
Since each is covered by each, it is possible to reliably block noise especially in the low frequency band under the synergistic effect of the combination as a whole, and it is also very effective in preventing noise in a wide range including the middle and high frequency bands. is there.

7 to 20 showing the transmission loss values of the present invention.
As is clear from a comparison with FIGS. 23 to 25 showing that of the conventional product, the excellent sound absorbing / insulating performance can be achieved by the thin single wall structure having the depth dimension.

Further, in addition to the thin-walled product, the outer cover (13) is made of decorative plywood and the inner cover (14) is made of glass fiber sheet, so that the weight can be remarkably reduced as a whole, and its transportation. Not only is it convenient for handling, but also it is not necessary to perform a laborious and time-consuming construction on site such as interposing the air layer (s) as a double wall structure unlike the conventional product. As a matter of course, it is excellent in the makeup effect and space saving effect as the surrounding material and the wall material.

In particular, if the structure of claim 2 is adopted,
Due to the reinforcing function of the partition bar (15), the durability of the sound absorbing panel (P) can be enhanced, and the size of the sound absorbing panel (P) can be easily increased. In addition, the outer core (11) and the inner core (12) are provided in a small chamber ( As a small product corresponding to R),
It can be handled easily, and there is no risk of instability in the filling state or misalignment due to fluffing from the middle of a large product.

The cores (11) and (12) are easily damaged by the adhesion of oil and water from the lower end of the sound absorbing panel (P) during use. However, it can be said that it is extremely effective for maintenance and inspection as it is possible to take out and replace only the small product.

Further, when the post-installed sound absorbing panel (P3) is fitted in the aligned connection state between the pre-installed sound absorbing panels (P1) and (P2) which are installed in parallel as a pair facing each other at the mouth end, the post-installed sound absorbing panel (P3) is fitted. The dowel (16) for insertion is made to protrude from the one side of the mouth in P3),
Similarly, a key hole (17) for receiving a dowel is provided on the other mouth side.
Is formed in a relational state in which the small-diameter long hole portion (17a) is biased upward from the axis (XX) of the dowel (16) by a constant amount (h1), and one of the sound absorbing panels (P
From the surface of the mouth in 1), the sound absorbing panel (P
Dowel (18) for insertion into the key hole (17) of 3)
The axis (XX) of the post-installed sound absorbing panel (P3) and the dowel (17) of the post-installed sound absorbing panel (P3). Dowels (16) on the panel (P3)
The key hole (19) for receiving the
a) is formed such that the post-installed sound absorbing panel (P3) is a double-ended sound absorbing panel (P3) by forming an opening in a relational state in which the axis (XX) of the dowel (16) is biased to an opposite lower position by an equal constant amount (h2). By fitting the P1 and P2 into each other so as to be dropped from above, the overall matched connection state is maintained. Therefore, when the sound absorbing panel (P) is used as an enclosure, For example, a space directly above the opening / closing door (20) and the inspection window is completely inserted between the front-mounted sound absorbing panels (P1) and (P2) which are installed in parallel as a pair so as to sandwich the opening / closing door (20) and the inspection window. After installation, the sound absorption panel (P3)
Can be fitted in a drop-down manner from above, and can be fixedly maintained so as not to fall in that state.

Therefore, it is not necessary to carry out welding work as in the conventional method, or to install a separate framework such as a mouth frame and a partitioning bar to support the above-mentioned sound absorbing panel (P3) so as not to fall. There is an effect that the connection workability is remarkably excellent.

[Brief description of drawings]

FIG. 1 is a perspective view showing an extracted sound absorbing panel of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is an explanatory diagram showing a state in which a noise source is surrounded by connecting and using a sound absorbing panel.

FIG. 4 is a cross-sectional view showing a modified example of the sound absorbing panel corresponding to FIG.

FIG. 5 is an exploded perspective view showing a fitting correspondence relationship between a pair of pre-mounted sound absorbing panels and a post-mounted sound absorbing panel.

6 is a partially cutaway front view of the fitted state corresponding to FIG.

FIG. 7 is a graph showing the sound absorption / insulation performance of the present invention by a noise signal generator (generated sound of 100 dB).

FIG. 8 is a graph showing the sound absorbing / insulating performance of the present invention by a noise signal generator (generated sound of 110 dB).

FIG. 9 is a graph showing the sound absorbing / insulating performance of the present invention by a noise signal generator (generated sound 120 dB).

10 is a graph showing sound leakage directionality corresponding to FIG. 7. FIG.

FIG. 11 is a graph showing sound leakage directionality corresponding to FIG. 8;

FIG. 12 is a graph showing sound leakage directionality corresponding to FIG. 9;

FIG. 13 is a graph showing the sound absorption / sound insulation performance of the present invention at a specific frequency (63 HZ).

FIG. 14 is a graph showing sound absorbing / insulating performance of the present invention at a specific frequency (125 HZ).

FIG. 15 is a graph showing the sound absorption / sound insulation performance of the present invention at a specific frequency (250 HZ).

FIG. 16 is a graph showing sound absorbing / insulating performance of the present invention at a specific frequency (500 HZ).

FIG. 17 is a graph showing the sound absorbing / insulating performance of the present invention at a specific frequency (1000 HZ).

FIG. 18 is a graph showing the sound absorbing / insulating performance of the present invention at a specific frequency (2000HZ).

FIG. 19 is a graph showing the sound absorption / insulation performance of the present invention at a specific frequency (4000 HZ).

FIG. 20 is a graph showing the sound absorption / sound insulation performance of the present invention at a specific frequency (8000 HZ).

FIG. 21 is a cross-sectional view showing a conventional product having a single wall structure.

FIG. 22 is a cross-sectional view showing a conventional product having a double wall structure.

FIG. 23 is a graph showing sound absorption / insulation performance of a conventional product corresponding to FIG. 7.

FIG. 24 is a graph showing the sound absorption / insulation performance of the conventional product corresponding to FIG.

FIG. 25 is a graph showing sound absorbing / insulating performance of a conventional product corresponding to FIG. 9.

[Explanation of symbols]

 (10) -Port frame (11) -Outer core (12) -Inner core (13) -Outer cover (14) -Inner cover (15) -Partition bar (16) -Dowel (17) -Key hole (17a)・ Small diameter long hole (17b) ・ Large diameter circular hole (18) ・ Dowel (19) ・ Key hole (19a) ・ Small diameter long hole (19b) ・ Large diameter circular hole (20) ・ Open / close door (P) ・ ・ Sound absorbing panel (P1) ・ Sound absorbing panel (P2) ・ Sound absorbing panel (P3) ・ Sound absorbing panel (R) ・ ・ Small chamber (h1) ・ Constant amount (h2) ・ Constant amount (XX) ・ Axis line

Claims (3)

[Claims] 1. A mouth plate (10) of a metal plate forming a mouth end surface,
A high-density rock wool outer core (11) and a low-density rock wool inner core (12) which are packed as two layers arranged in parallel inside the inner frame (1).
A sound-absorbing panel comprising an outer cover (13) made of decorative plywood attached to and integrated with (0) and an inner cover (14) made of a glass fiber sheet also fitted to the mouth frame (10). 2. The inside of the mouth frame (10) is subdivided into a plurality of small chambers (R) by partition bars (15) welded to the metal plate, and an outer core (R) is provided in each small chamber (R). The sound absorbing panel according to claim 1, wherein two layers each of 11) and the inner core (12) are filled in and out freely. 3. When the post-installed sound absorbing panel (P3) is fitted into the interlocking connection between the pre-installed sound absorbing panels (P1) and (P2) arranged in parallel as a pair of facing wooden mouth faces, the subsequently installed sound absorbing panel (P3) In P3), a dowel (16) for insertion is made to project from one of the wood mouth surfaces, and a dowel receiving key hole (17) is similarly formed on the other wood mouth surface, and the small diameter elongated hole portion (17a) has the dowel (16). From the axis line (XX) of the first sound absorbing panel (P1) to the keyhole of the sound absorbing panel (P3). Insert dowel (18) for (17) into its axis (XX)
Causes the post-installed sound absorbing panel (P3) to project into a corresponding state that corresponds to the dowel (16), and on the other end of the pre-installed sound absorbing panel (P2),
The key hole (19) for receiving the dowel (16) of the post-installed sound absorbing panel (P3) has a small and small diameter hole portion (19a) equal to the axis (XX) of the dowel (16) by a constant amount (h2).
However, an opening is formed in a relational state in which it is biased to the opposite lower position, and by fitting the above-mentioned sound absorbing panel (P3) to be mounted between the two sound absorbing panels (P1) and (P2) to be mounted so as to drop from above, The method of fitting the sound absorbing panel, which is characterized by maintaining the mechanically matched connection state.