JPS6041898Y2 - Vacuum cleaner alarm device - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a filter clogging alarm device for a vacuum cleaner that generates a sound using the load of the vacuum cleaner to issue an alarm.

Conventional technology Conventionally, as a means of notifying the user of a clogged filter, a communication path connecting the suction side of an electric blower and the atmosphere was used.
Providing a valve device that opens and closes the communicating path according to changes in air pressure, and providing a sound generating section that generates sound in accordance with the opening and closing of the valve device within the communicating path or at the atmospheric side end of the communicating path,
When the filter becomes clogged and the air pressure on the suction side of the electric blower drops below a certain limit, the valve device opens and air flows from the atmosphere through the communication path to the electric blower side, and this air flow causes noise to be emitted from the sound generating section. A device that generates sound can be seen.

The problem that the invention aims to solve By the way, when the filter is clogged, the vacuum pressure at the front of the electric blower is about 1500 mmH. This results in extremely high vibration frequencies in whistles, etc., which produce sound due to vibrations of the air itself or diaphragms such as reed plates used as sound generating devices.

This high-frequency sound is very effective as an alarm, but as an alarm that notifies the user of a clogged filter, it only causes discomfort to the user.

In addition, there is only one type of sound quality, and the user cannot change the sound quality according to his/her preference, which is very inconvenient.

In addition, the external air flowing in through the communication passage flows through the motor section of the electric blower and has another important function of cooling the motor section.

However, in the past, the device that generates the alarm faced the air flow system, which created ventilation resistance, which reduced the amount of air flow to the motor and caused the risk of overheating.

The present invention solves these conventional problems, and provides a sound generating device that does not cause discomfort to the user and allows the user to change the sound quality according to his/her preference, as well as cooling the motor part. I have definitely done that as well.

Means for Solving the Problems In order to solve these conventional problems, the present invention uses an electric blower, a filter installed on the suction side, and a regular filter that opens in response to the suction force of the electric blower. One end is connected to the suction side of the electric blower downstream of the filter through a closed pressure valve, and the other end is connected to the atmosphere, and the surrounding wall is open to the atmosphere with multiple diaphragms facing each other, each with a different natural frequency. A sounding cylinder with a hole formed therein, and a hole at both ends formed in the peripheral wall to be rotatably provided on the inner periphery of the sounding cylinder, and to control the opening of the hole facing the diaphragm by rotational displacement. This device is equipped with a tone quality switching tube and an operating body for the same tone quality switching tube.

Operation In the above-mentioned present invention, when the pressure valve is opened, external air flows not only through the hole facing the diaphragm but also through the opening at one end of the sound quality switching cylinder.

Therefore, all the air does not act intensively on the diaphragm, and high frequency vibration can be prevented.

The sound quality can also be changed by rotating the sound quality switching tube and controlling the opening state of the hole.

Furthermore, since the air flowing in through the opening at one end of the sound quality switching tube is not affected by the diaphragm or the like, it smoothly reaches the motor of the electric blower, thereby ensuring its cooling.

Example One embodiment will be described below with reference to the drawings.

In Figs. 1 to 4, 1 is a main body with a built-in electric blower 2 and a hollow handle 3 formed on the upper part, and 4 is a housing removably connected to the front of the main body 1, that is, the suction side of the electric blower 2. It is a car container and has a filter 5.

6 is a communication pipe whose base end communicates with the suction side of the electric blower 2 on the downstream side of the filter 5 through the vent 8 of the main partition wall 7; and 9 is the communication pipe when the suction force of the electric blower 2 reaches a certain value or more. A normally closed pressure valve opens the communication pipe 6 against the spring 10, and 11 is a sounding cylinder with both ends open.

One end of the sounding tube 11 is connected to the tip of the communication tube 6, and the other end is open to the atmosphere through a port 12 formed in the handle 3.

Further, holes 14 facing the diaphragm 13 are formed in the circumferential wall of the sound tube 11 at positions dividing the circumference into three equal parts, and holes 14 that are rotatable and open at both ends are formed on the inner circumference of the sound tube 11. The sound quality switching cylinder 15 is fitted.

The above-mentioned sound quality loading tube 15 has a handle 3 on the atmosphere side end of the sounding tube 11.
It has a dial-shaped operating body 16 that partially protrudes from the upper part of the sound tube 11, and two holes 17 corresponding to two of the holes 14 of the sounding tube 11 are always in shape.

The diaphragm 13 has a free end, and the base end is integrated with the sounding tube 11, and each of the three diaphragms 13 has a different natural frequency.

In the above configuration, if filter 5 is now normal,
Since the pressure valve 9 is closed, the communication pipe 6 and the sounding cylinder 11
．． There is no outside air flowing in through the sound quality switching tube 15, and normal cleaning work can be performed (FIG. 1).

Next, when the filter 5 becomes increasingly clogged and the pressure drop on the downstream side reaches a certain value or more, the pressure valve 9 opens against the spring 10, and the opening 12 → sound quality switching cylinder 15 → communication pipe 6 - ventilation Port 8 → Electric blower 2 and outside air are introduced to prevent overheating of the motor in the electric blower 2 (second
figure).

In the state shown in FIG. 2 above, the air flowing into the sound cylinder 11 is as follows.
Most of it is made from the opening of the sound quality switching cylinder 15, and the remaining small amount is passed through the hole 17 of the sound quality switching cylinder 15 to the hole 1 of the sound quality switching cylinder 11.
4 and the diaphragm 13.

The diaphragm 13 vibrates due to the air flow flowing in through this gap, thereby generating sound.

The above-mentioned sound has a low frequency due to the relationship with the air flow rate, and the sound quality switching cylinder 15 is configured so that the two diaphragms 13 always vibrate, and each frequency is appropriately selected. , a humming sound, or a chord, which is easy to hear and does not cause discomfort to the user.

Next, by turning the operating body 16 protruding from the upper part of the handle 3 from the state shown in FIG. 3, the diaphragm 1
The combination of 3 changes.

Since the natural frequency of each diaphragm 13 is different, by rotating the operating body section 16 to change the combination of diaphragms 13, the sound quality will change.

By operating the operating body 16 as described above, three types of sound quality can be generated, and the user can select the desired sound quality.

In this embodiment, the two diaphragms 13 are configured to vibrate at all times, but it is also possible to use one or more than two diaphragms, and the point is that any desired sound quality can be selected by external operation. good.

Effects of the invention As described above, according to the invention, it is possible to notify the user of the clogging of the filter with a sound that is very easy to hear, and also allows the user to adjust the clogging according to his/her preference through external operation.
It is possible to provide a sound generating device that can select and switch sound quality.

Furthermore, since a predetermined amount of air is always secured to reach the electric motor of the electric blower, thermal failure due to overheating can be reliably prevented.

[Brief explanation of the drawing]

Fig. 1 is a partially cutaway sectional view of a vacuum cleaner showing an embodiment of the present invention, Fig. 2 is a partially cutaway sectional view of the same when the filter is clogged, Fig. 3 is a sectional view of the sounding cylinder, and Fig. 4 The figure is a cross-sectional view of the same sound cylinder, showing the state in which the sound quality has been switched. 2... Electric blower, 5... Filter, 9... Pressure valve, 11... Sound cylinder, 1
3...Diaphragm, 14...Hole, 15...
...Sound quality switching tube, 16...Operation body, 17.
...hole.

Claims (1)

[Scope of utility model registration request] An electric blower and a filter installed on the suction side,
One end is connected to the suction side of the electric blower downstream of the filter via a normally closed pressure valve that opens in response to the suction force of the electric blower.
The other end is connected to the atmosphere, and the peripheral wall has a plurality of diaphragms with different natural frequencies, each with a hole open to the atmosphere. An electric cleaner comprising: a sound quality switching tube having openings at both ends and having a hole formed in a peripheral wall to control the opening of the hole facing the diaphragm by rotational displacement; and an operating body for the same sound quality switching tube. Machine alarm system.