JPS6038513B2 - Sash that can prevent whistling - Google Patents

Description

[Detailed Description of the Invention] In recent years, high-rise housing complexes have appeared in various parts of Japan, and when the wind blows from a specific direction depending on the location of the building, the sash part causes a whistling sound. As a result, a sound similar to that made when blowing a whistle is generated, and residents often complain of discomfort.

Therefore, the current situation is that building constructors are under pressure to eliminate such whistling phenomena and dispel the discomfort of residents. The inventors of the present invention began their experiments in pursuit of the cause of the whistling phenomenon described above.

Generally, the following cases can be considered as the source of the whistling sound. In other words, {1} Whistle sounds due to pressure difference between indoor and outdoor.

■ A whistling noise caused by the deformation of the stile of the sash due to the pressure difference between indoor and outdoor environments.

t3} Whistle sound due to the shape of the frame and stile.

{41 Whistle sound due to the shape of tight material. [5] Whistle from the ventilation grill.

In order to confirm these possible sound sources, the quickest way is to reproduce and observe the whistling phenomenon, so we conducted a whistling phenomenon reproduction test.

The measurement method is to install a Myrofon near the sound source and perform noise level measurement and frequency analysis.
An indicating sound level meter and a frequency analyzer were used as measuring instruments. First, with the frame A and the upper stile B of the sash as shown in Fig. 1a, remove the tight material from the pocket C for ironing the tight material on the frame side, and then remove the tight material from the pocket C. The gap between the surface D and the facing surface E of the upper stile B is approximately 4.
5 side, and the recess F at the top of the upper stile B was filled with a filler (for example, rubber) G to make the surface flat.

When the indoor pressure was changed from 0 to the negative side under these conditions, when the pressure reached -10 kg', a particularly loud whistling sound occurred in the pocket C where no tight material was attached. did. Therefore, in order to analyze this whistling sound, we placed a microphone near the blue line, measured the noise level to measure the strength of the sound, and conducted frequency analysis to find out the characteristics of the sound. When this measurement result is expressed in a graph, it is as shown in Figure 2 at 30k9/ (corresponding to a wind speed of 24'sec) and at 50k9' (corresponding to a wind speed of 32'/sec) in Figure 3. , 2000
An extremely large peak is observed near HZ.

It is inferred that such a peak causes the whistling phenomenon, but since all the tight material was removed in this way, it is clear whether or not the sound source is the pocket part C where the tight material should be formed. Since this cannot be determined with certainty, the pocket C was covered with tape as shown in b of Fig. 1, and the experiment was conducted as a smooth surface. As shown in No peaks were observed and no whistling occurred. At any pressure difference, at any frequency, the value was less than 7 mother B. However, if you look at the cross-sectional shape of the sash, there are other parts that have a groove-shaped cross-sectional shape. Figures 2 and 3 show the recess F exposed by removing the closing material.
A graph indicated by ■ in the figure was obtained, and in this case, a whistling sound occurred. As can be seen from this graph, a peak appears at 1000Hz. Previous experiments have shown that the cause of whistling is the shape of the brim and the size of the airflow, just like in a whistle. The results of the experiment with the tight material 1 attached to the pocket C are shown in Figures 2 and 3.
, and a whistling sound occurred.

At this time, the recess F in the upper stile was once again blocked by the blocked village G. As is clear from the graph, a peak exists in this case as well, and the peak is approximately around 2000Hz. From the above facts, it was found that the whistling phenomenon is caused by the tight material with the shape of a brim or the shape of the collar, and that it is related to the size (i.e., speed) of the airflow.

It was also found that depending on the shape of the pot, even a very small pressure difference (strength of airflow) can serve as a sound source. As mentioned in the beginning, the experiments to date have combined the factors set in the reproduction test of the whistling phenomenon with silk.

Therefore, a box-shaped tight material J is iron-fitted to the pocket part C of the frame.
A sealing material G was applied to the recess F of the sash, and the conditions under which no sound was produced were selected from the experimental results so far and measurements were conducted.
In this experiment, the relationship between the frame shoji was set in a free state, and the condition was the same as the actual standard condition except for the tight material J and the mackerel G, and the measurement results with the configuration shown in e in Figure 1 were It is shown in the figure and ■ in Fig. 3. There was no peak in this graph, and no whistling phenomenon occurred. In short, it was found that the flow of air through the gap between the stile and the tight material due to the bending of the stile itself has no direct relation to the whistling sound, and that the tight material and the shaped material, which have a pot-shaped shape, are the major cause. .

The present inventors propose the embodiment shown in FIG. 4 in light of the above facts, and in the above experimental example, b of FIG.
This corresponds to

In this figure, reference numeral 1 denotes a movable sash on the outside of the room, in this case the movable sash on the inside of a sliding window, and is composed of a stile 2 and a glass plate 3. The recess 4 formed at the end of the stile 2 is filled with a closing material 5 made of a gap filler such as rubber, and its surface forms a flat surface. Reference numeral 6 indicates a window frame on the indoor side, and reference numeral 7 indicates a pocket portion formed in this window frame 6. This pocket portion 7 has a box-shaped tight material 8 and is groove-iron-fitted. The surface forms a flat surface 9.

In this embodiment, this flat surface 9 and the movable sash 1
The gap 1 with the smooth opposing surface 10 is 4.5. If such a large gap is expected due to the generation of negative pressure on the indoor side, the sealing material 5 is a necessary condition to prevent whistling due to the flow rate and flow rate of the airflow. In the above embodiment, the tight material 8 was attached to the window frame 6 side, but in reality, the tight material 8 may be attached to the movable sash side or both the window frame and the movable sash. are also included in the embodiments of this invention.

[Brief explanation of drawings]

Figures 1a to 1e are explanatory diagrams showing the foundations used in the experiment, Figures 2 and 3 are frequency-sound pressure graphs for different pressure differences, and Figure 4 is an embodiment of the present invention. FIG. 3 is an example cross-sectional view. In the figure, 1...movable sash, 2...
・Stile, 3...Glass plate, 4...Recess,
5...Closing material, 6...Window frame, 7...
・Pocket part, 8...Tight material, 9...
・Flat surface, 10... Opposing surface. Figure 1 2
Figure 3 Figure 4

Claims (1)

[Claims] 1. The surface of the tight material attached to at least one of the movable sash with a recess formed in the end and the window frame and the surface facing the same are formed to be smooth, and the end of the movable sash is formed with a smooth surface. A satsushi capable of preventing whistling, characterized in that the recesses of the groove are covered with a filling material and the surface is made flat.