JPS5855828A - Motor siren - Google Patents

Abstract

PURPOSE:To use leakage sound waves from the suction side effectively, by a method wherein a horn is provided on the suction side and sound waves leaked from the suction side are radiated to the fixed direction. CONSTITUTION:A motor 3 rotates a sound generating impeller 4. The rotation of the impeller causes air to be sucked in through an opening 31, a suction window 5, and an suction port 6. The air sucked in is intermittently led to an exhaust port 7 and an exhaust window 8, and generates sound at the port 7 and window 8. The generated sound is radiated in the same direction with that of the exhaustion, with air, directly from an opening 22 or through a passage 23 by the horn on the suction side. At the same time, the sound is also radiated in the reverse direction to the air flow from an opening 31 through the suction port 6, suction window 5, and a passage 32.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a motor siren that saves energy by effectively utilizing the fabled phenomenon that leaks from the intake side.

The present applicant has already proposed a motor siren shown in FIGS. 1 and 2 that efficiently magnifies the generated sound and has directivity (Utility Model Publication No. 53-3023). In these figures, when the power is turned on, the electromagnet (1) raises the silence plate (2), and the motor (3) raises the sound impeller (1).
4) rotates. Due to the rotation of the sounding impeller (4), air is sucked through the intake 11 (5) and the intake hole (6), and the distance Wa between the exhaust hole (7), the exhaust window (8), and the annular horn (9) is
The generated sound wave is directly radiated from the opening α of the directional horn αυ in the same direction as the exhaust air through the circumference of the directional horn Ql). ! In the 0 portion, the light is emitted from the opening a4 through the flow path a4.

In such a motor siren, sound waves also leak from the intake side. In the past, we did not pay attention to the use of leaked sound waves because sirens are installed on top of towers of considerable height, and the leaked sound waves radiate upward, so they did not cause noise pollution and were ignored. However, experiments have shown that the volume of the leaked sound waves is almost the same as the volume of the sound waves radiated from the original exhaust horn. It turned out that.

The present invention has been made in view of the above points, and includes a horn provided on the intake side in addition to the horn provided on the exhaust side. Therefore, the sound waves leaking from the intake side, which have not been used in the past, can be effectively used, and energy can be saved.

An embodiment of a motor siren according to the present invention will be described with reference to FIG. 3 and subsequent figures. Note that the same parts as in FIGS. 1 and 2 are given the same reference numerals.

In Fig. 3, α fathom is a support, and a motor (3) is mounted on this support α4, and a disk-shaped support plate α9 is fixed to the upper part of this motor (3). The rotating shaft (I6) of the motor (3) protrudes through the. A sounding impeller (4) formed of a plurality of sounding blades formed radially is fitted onto this rotating shaft, and the outer periphery of this sounding impeller (4);
= is formed with an exhaust hole (7). This pronounced wing wheel (
4), a shallow cylindrical sounding case αη is covered and fixed to the support plate a9, and around the outer periphery of this sounding case αD there is an exhaust window ( 8), and an intake hole (6) is formed on the top surface.

The sounding case aη is surrounded by an exhaust horn as-c on the outer periphery with a gap. This exhaust side horn has an upper and lower plate (tl12Q,
It consists of a substantially U-shaped side plate Qυ that surrounds the outer periphery of the upper and lower plates l-, and an opening @ is formed in one direction at one end, and the sounding case αη is formed at the opposite end.
The gap between the semicircular side plate QD and the semicircular side plate QD forms a flow path (c). In addition, a hole having the same diameter as the sounding case α is bored in the lower plate 0Q, the inner peripheral end of which is fixed to the outer peripheral end of the support plate ([5)], and the upper plate (II) has the intake hole (6). A slightly larger hole is bored, and the inner circumferential portion thereof is placed and fixed on the upper surface of the outer circumferential end of the sounding case aη.
) (Secondly, a wire mesh (goods) is stretched to prevent the intrusion of lightning and birds.The upper part of the sounding case aη has an opening so that the bottom communicates with the intake hole (6), and a wire mesh on the side. A frame body (c) is fixed with a wire mesh stretched thereon to form an intake window (5), and an electromagnet (1) is placed on the upper part of this frame body (c).

A sound deadening plate (2) for opening and closing the intake hole (6) is provided at the lower end of the electromagnet (1) and the rod (c) so as to be movable up and down.

An intake side horn having substantially the same shape as the exhaust side horn is provided on the outer periphery of the frame (c). This intake side horn plate is also made up of upper and lower plates and a side plate that is bent into a U shape surrounding the outer periphery of these plates, and has an opening G at one end.
υ is formed, and at the opposite end, the gap between the frame (c) and the semicircular side plate (to) serves as a flow path. The lower plate is placed on the exhaust side horn or upper plate Q'J,
Attachment holes are drilled in the lower plate and the upper plate α at a predetermined center angle, and they are fixed with screw cans. In addition, a wire mesh is stretched over the opening Gυ. The upper plate (
C) A cover plate (C) for covering the electromagnet (1) is fixed with screws (C).

Next, the action of the siren according to the present invention will be explained.

When the power is turned on, the electromagnet (1) is activated and the sound deadening plate (2) is activated.
) rises, and the sound impeller (4) is raised by the motor (3).
rotates. Due to the rotation of the sound impeller (4), air is sucked through the opening c11J, the intake window (5), and the intake hole (6), and the air is sucked in through the opening c11J, the intake window (5), and the intake hole (6). Intermittent and loud sound occurs. The generated sound is radiated from the opening @ in the same direction as the exhaust direction along with the air either directly or through the flow path (toward) in the exhaust side horn.

At the same time, in the intake side horn penalty, the air flows in the opposite direction through the intake hole (6), intake window (5), and flow path 02 to the opening 0.
1) It is radiated from.

Incidentally, when a test was conducted using the 0.4 KW motor siren according to the above embodiment, the volume emitted from the first air side was the same as or slightly higher than the volume emitted from the exhaust side, as shown below.

Next, in Fig. 4, if the openings (2) and Gυ of the exhaust side horn as and the intake side horn are not 180 degrees opposite, but at a certain angle, the intake side horn (
After removing the cover plate (2) of the intake side horn (2) and the exhaust side horn α1, remove the screw (2) that fixes the intake side horn (2) and the exhaust side horn αl, shift it by a predetermined angle as shown by the dashed line, and screw it again (2). (to). The angle at this time is made to match, for example, so as to connect the position where the siren is installed and the upstream and downstream areas where the dam water discharge warning is given. Also, when providing directivity in only one direction, the opening between the exhaust side horn a ladder and the intake side horn Qη (
Goods) By fixing Gυ in the same direction, twice the volume can be obtained.

In the embodiment shown in Fig. 3, the exhaust side horn a9 and the opening Gυ of the intake side horn are both provided so that sound waves are radiated in the horizontal direction. The tip of the opening device 〇〇 of one or both of the horns may be formed with a vertical angle.

In the above embodiment, the flow path (toward) of the exhaust horn You may also provide an opening (a) for each horn with a penalty of 0 seconds.
Gυ may be shaped like a trumpet, expanding toward the tip.

FIGS. 5 and 6 show another embodiment in which the exhaust side horn 6η and the intake side horn (2) are made omnidirectional so that sound waves can be radiated in all directions of 360 degrees. In these figures, the exhaust side horn l37) has a circular lower plate (
The intake side horn (to) also consists of the middle partition plate -, the upper plate and the gap W (4υ) installed radially with a predetermined gap between them. The exhaust side horn Gη and the intake side horn (to) are each formed to serve as the above-mentioned partition plate, but as separate bodies, they are screwed together as in the case of Fig. 3. The sides of the lower plate (to), the middle partition plate (Al) and the upper plate 62 each have an opening (Oη) over which a wire mesh @4) is stretched. (4), the structure inside the horn such as the sounding case (I7), the intake window (5), the motor (3), the electromagnet (1), the silence plate (2), and the cover plate (c) of the upper plate @2. The structure and the like are the same as those of the previous embodiment.

In such a configuration, when the silence plate (2) is pulled up and the motor (3) is turned, air flows through the opening (47) around the entire circumference of the intake side horn (to), through the intake window (5), and through the sounding case ( 1?)
The openings around the entire circumference of the exhaust side horn (
Discharge from c). The generated sound waves are radiated from all seven areas around the exhaust side horn (9) and the intake side horn (c), forming an omnidirectional siren.

As described above, the present invention utilizes leaked sound waves from the intake side, which were conventionally left as they are, by radiating them in a predetermined direction by providing an intake side horn. If the two horns are oriented in the same direction or non-directional, the volume output can be doubled compared to conventional motor sirens when the same motor is used, and a smaller motor is required to obtain the same output, saving energy. .

In addition, to provide directivity in two directions, simply assemble the intake side horn and the exhaust side horn to point in any two directions, and you can configure many types of sirens with different directions in one model, compared to conventional sirens. There is no need to separately manufacture type 1. In particular, when providing directionality along the flow direction of a meandering river, such as a dam water discharge warning siren, 180 degrees, 1
In addition to 20 degrees, 90 degrees, and other unique angles are required,
The siren of the present invention can be used at any angle.

[Brief explanation of the drawing]

Figure IJ1 is a vertical sectional view of a conventional motor siren, Figure 2 is a partially sectional plan view of the same as above, Figure 3 is a vertical sectional view showing an embodiment of the motor siren according to the present invention, and Figure 4 is a longitudinal sectional view of the same as above. FIG. 5 is a longitudinal sectional view showing another embodiment of the present invention, and FIG. 6 is a partially sectional plan view of the same. (4)... Sound impeller, (6)... Intake hole, (8)...
・・Exhaust window, aη...pronunciation case, Q8)C37)・
...Exhaust side horn, @■...opening, @(to)...
Intake side horn, 0υ (4η...opening.

Claims (3)

[Claims] (1) Air sucked through the intake hole of the sounding case is intermittently discharged by a rotating sounding impeller and an exhaust window on the outer periphery of the sounding case to produce sound, and is then exhausted from the opening of the exhaust side horn placed over the sounding case. In a motor siren configured to radiate sound waves in the same direction as the air intake direction, an intake side horn is provided on the side communicating with the intake hole, overlapping with the exhaust side horn, and the intake side horn is provided with a sound wave opposite to the air suction direction. A motor siren characterized by having an opening that emits sound waves in a direction. (2) The openings of the intake side horn and the exhaust side horn are each formed with directivity in a predetermined direction, and these openings can be assembled so as to be oriented in the same direction or in any two directions. The motor siren described in item 1. (3) The motor siren according to claim 1, wherein the intake side horn and the exhaust side horn are opened in all directions.