JPH11318772A - Electric vacuum cleaner - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To provide a vacuum cleaner having a mechanism in which the temperature of a motor and its surroundings does not rise more than a certain level. SOLUTION: An intake port 26 of a motor 13 has a lower part 1 of a main body.
The opening 33 of the inlet 15 which is hermetically shielded by the intake hole 30 formed in 1 and the inlet 15 which can take in external air, and which extends to the outer shell to take in outside air,
It is hermetically shielded from the outside by a packing 16 made of an elastic material. One end of the shape memory body 17 that changes its shape according to a certain temperature or more is fixed to the lower body 11 near the motor 13, and the movable side is fixed to the packing 16. At normal temperature, the shape memory 17 is in a position where the packing 16 is pressed against the opening 33 of the inflow port 15 and is hermetically held. However, when the temperature of the motor 13 and the space around the motor 13 rises by a certain level or more, the shape memory 17 is The packing 16 is deformed as shown in FIG.
And the opening 33 of the inflow port 15 is opened.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vacuum cleaner used in ordinary households, and has a mechanism for lowering the temperature of a space around a motor when the space around the motor becomes high due to heat generated by the motor. is there.

[0002]

2. Description of the Related Art A conventional vacuum cleaner will be described with reference to FIG. A motor (electric blower) 3 fixed by the main body upper part 2 and the main body lower part 1 is arranged in a rear space of the outer shell composed of the main body upper part 2 and the main body lower part 1, and a dust collecting bag 4 is stored in front of the motor. The vacuum cleaner is provided with a dust chamber 9 and collects dust in a dust bag 4 from a suction port 10 provided in front of the dust chamber 3 by driving a motor 3. Motor 3
As a power source, a general household power source is used. A thermoprotector 5 having a switching function of passing a current at a normal temperature in the middle of the wiring and not passing a current at a certain high temperature or higher is connected to the upper part 2 of the main body near the motor 3. Attached to. The wind 7 by the suction of the motor 3 has a function of cooling the motor 3, and the dust is accumulated in the dust collection bag 4, thereby increasing the ventilation resistance and reducing the amount of the wind 7. When the temperature rises, and when it rises beyond a certain level, the thermoprotector 5 for preventing thermal deformation around the motor 3 operates, and the power supply to the motor 3 is turned off. In addition, since the amount of the wind 7 is reduced due to the dust clogging the dust collecting bag 4 and the differential pressure between the inside and outside of the dust collecting chamber 3 is increased, an air protector 6 having a role of taking in the external air 8 using the same is provided. However, when the vacuum cleaner is used at a weak position (a position where the suction force is weak), the air protector 6 is difficult to operate because the pressure difference between the inside and outside is small. And the thermoprotector 5 is easy to operate.

[0003]

In such a conventional vacuum cleaner, the wiring for attaching the thermoprotector 5 is troublesome, and the body is suddenly turned off during use, and the temperature around the motor 3 drops. Unusable until temporarily. There is also a device that uses the air protector 6 to prevent the protector 5 from operating, but when the pressure difference between the inside and outside is small, the air protector 6 is not used.
Does not operate, and as a result, the protector 5 operates.

The present invention has been made to solve the above-mentioned conventional problems, and prevents the temperature of the motor and its surroundings from increasing even if the pressure difference between the inside and outside is small, without using a thermoprotector. An object is to provide a vacuum cleaner.

[0005]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a motor having an intake port communicating with a dust collecting chamber, an inlet communicating with the inlet and taking in outside air, and an inlet. And an opening / closing unit for opening / closing the opening / closing unit. With the above configuration, the temperature of the motor and its surroundings can be reduced by taking in the outside air as cooling air from the inflow port into the motor and its surroundings, and since the opening and closing part opens and closes according to the temperature, the difference between inside and outside Even when the pressure is small, the cooling operation can be reliably performed.

[0006]

BEST MODE FOR CARRYING OUT THE INVENTION
A dust collection chamber that collects dust, a motor having an intake port that communicates with the dust collection chamber, an inflow port that communicates with the intake port and takes in outside air, and an opening and closing unit that opens and closes the inflow port, The opening and closing section is opened and closed according to the temperature.

With the above structure, the temperature of the motor and its surroundings can be lowered by taking in outside air as cooling air from the inflow port into the motor and its surroundings. The cooling operation can be reliably performed even when the differential pressure is small.

According to a second aspect of the present invention, there is provided a dust collecting chamber for collecting dust, a motor having an air inlet communicating with the dust collecting chamber, an inlet communicating with the air inlet and taking in outside air, An opening / closing unit for opening and closing the inflow port; and a shape memory alloy body having one end arranged near the motor and the other end connected to the opening / closing unit, wherein the shape memory alloy body is provided with the opening / closing unit when a temperature exceeds a predetermined value. Is opened.

The invention described in claim 3 is the first or second invention.
The inflow port is kept closed by the negative pressure of the motor acting on the opening / closing section described above. In a normal use state where the motor temperature does not rise, no force such as a spring is required to close the opening / closing section.

According to a fourth aspect of the present invention, there is provided a dust collecting chamber for collecting dust, a motor having an air inlet communicating with the dust collecting chamber, an inlet communicating with the air inlet and taking in outside air, An opening / closing unit that opens and closes the inflow port, and an opening / closing drive unit that drives the opening / closing unit to open and close according to the difference between the temperature and the external pressure and the negative pressure of the motor.With this configuration, a thermoprotector and an air protector are provided. You can also double.

According to a fifth aspect of the present invention, the opening / closing drive means for the packing is formed of a coil-shaped shape memory alloy body.

According to a sixth aspect of the present invention, a concave or convex portion is provided at a portion of the opening / closing portion which comes into contact with the inflow port. The protrusions or protrusions are provided, and with this configuration, the extension distance of the tight surface can be increased.

[0013] The invention according to claim 7 is the invention according to claims 2 and 3,
A plurality of fins are provided on the motor side of the shape memory alloy body according to any one of the above items 5 and 6, and the temperature around the motor can be accurately detected by this configuration.

[0014]

(Embodiment 1) Hereinafter, a first embodiment of the present invention will be described.
This will be described with reference to FIG.

A motor (electric blower) 13 fixed by the upper body 12 and the lower body 11 is disposed in a rear space defined by the upper body 12 and the lower body 11. Is provided with a dust collecting chamber 32 in which the dust collecting bag 14 is mounted. The vacuum cleaner is configured to store dust in a dust collection bag 14 from a suction port 10 provided in front of a dust collection chamber 32 by driving a motor 13. The intake side of the motor 13 is hermetically shielded by an intake hole 30 provided in a part of a partition wall formed in the lower portion 11 of the main body and an inlet 15 through which external air can be taken in from the upper surface side of the upper portion 12 of the main body. The wind 25 sucked by the drive of the motor 13 is removed of dust by the dust collecting bag 14 installed in the dust collecting chamber 32 formed by the lower body 11 and the dust cover 31. After passing through the inside of the motor 13, the space around the motor 13 formed by the motor 13, the lower body 11 and the upper body 12 is cooled and released to the outside together with heat. The opening 33 of the inflow port 15 extending to the outer shell for taking in outside air is hermetically shielded from the outside by a packing (opening / closing section) 16 made of an elastic material such as rubber. One end of the shape memory body 17 that changes its shape according to a certain temperature or more is fixed to the lower body 11 near the motor 13, and the movable side is the packing 16.
Are fixed by bonding or the like. At a normal temperature, the shape memory body 17 is located at a position where the packing 16 is pressed against the opening 33 of the inflow port 15 and keeps the opening 33 hermetically closed. However, dust accumulates in the dust collecting bag 14, and the wind 25 generates resistance due to the resistance. When the temperature decreases and the temperature of the motor 13 and the space around the motor 13 rises above a certain level, the shape memory 17 is deformed as shown at 18 to open the sealed packing 16 and the opening 33 of the inflow port 15.

The operation of the above configuration is as follows.
When the opening 33 of the inflow port 15 is opened, the air 26 is taken into the motor 13 and its surroundings to form cooling air, thereby lowering the temperature of the motor 13 and its surroundings.

(Embodiment 2) A second embodiment of the present invention will be described below with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

A shape memory alloy was used for the shape memory 17. The operation of the above configuration is as follows.

Since the shape memory alloy body is a general-purpose product, it is easy to select one that deforms at different temperatures.
Temperature conditions for opening the opening 33 of the inflow port 15 can be easily set.

(Embodiment 3) Hereinafter, a third embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

A packing (opening / closing portion) 21 made of an elastic material such as rubber, which is vertically movable and located outside the opening 33 of the inlet port 15, hermetically shields the opening 33 by the suction force of the motor 13. . The shape memory body 19 has one end fixed to the vicinity of the motor 13 and the other end normally located at a position not in contact with the packing 21. However, when the temperature around the motor 13 exceeds a certain temperature, the shape memory body 19 is deformed to 20 and the packing 21 is deformed. The opening 33 is opened by holding it at the upper part of the opening 33 to form the air 22, and the air 26 is taken into the inflow port 15.

The operation of the above configuration is as follows.
In the normal state, the opening 33 formed by the packing 21 and the lower part 11 of the main body is closed by the suction force of the motor 13, and the shape memory 20 does not need to press the packing 21 against the opening 33. No stress is applied to the flow path 20 downstream of the flow path.

(Embodiment 4) A fourth embodiment of the present invention will be described below with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The shape memory body 24 formed into an elastic shape has a lower end fixed in the inflow port 15 of the lower body 11, and an upper end fixed to a movable packing (opening / closing portion) 23 made of an elastic material. The packing 23 is pressed against the opening 33 of the inflow port 15 by the elasticity of the shape memory body 24 to hermetically shield the outside from the inflow port 15. The shape memory 24
The pressure due to the elasticity is normally set to a weight that does not fluctuate due to the differential pressure between the inside and outside until the dust collects in the dust collecting bag 14 to a certain degree. Then, the opening 33 is opened. When the temperature of the motor 13 and its surroundings becomes higher than a certain level, the shape memory body 24 is deformed and shrunk, and the packing 23 and the opening 33 of the inflow port 15 are opened.

The operation of the above configuration is as follows.
Since the shape memory body 24 is formed in an elastic shape, the shape of the opening 3 is changed by changing the temperature and pressure.
Since the air protector 3 is opened and the air 26 is taken in, the thermo protector and the air protector can be used.

(Embodiment 5) A fifth embodiment of the present invention will be described below with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The shape memory 24 is formed into a coil shape having elasticity, and the shape is deformed by a change in temperature and pressure to open the opening 33 and take in the air 26.

The operation of the above configuration is as follows.
The coil shape is general-purpose, the elastic constant is easily set, and the variation in elastic force is small, so that the degree of vacuum that the opening 33 opens can be kept constant.

(Embodiment 6) A sixth embodiment of the present invention will be described below with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

A packing (opening / closing portion) 21 made of an elastic material has a concave portion 27 and an inflow port 15 formed in the lower portion 11 of the main body.
The opening 33 has a convex portion 28 in contact with the packing 21 at a portion in contact with the packing 21.

The operation of the above configuration is as follows.
The convex portion 27 and the concave portion 28 increase the distance between the tight surfaces and increase the shielding performance against the outside air.

(Embodiment 7) Hereinafter, a seventh embodiment of the present invention will be described with reference to FIG. The same components as those in the first embodiment are denoted by the same reference numerals, and description thereof will be omitted.

The shape memory 17 which is deformed when the temperature rises above a certain level is fixed to the upper part 11 of the main body near the motor 13. The shape memory 17 has a plurality of fins 29 near the motor 13.

The operation of the above configuration is as follows.
By having a plurality of fins around the motor 13, it is possible to detect temperatures at many points near the motor.

[0035]

According to the first and second aspects of the present invention, the opening of the inflow port is opened in accordance with the temperature, so that air is taken in from the inflow port to the motor and its periphery. A cooling protector with electrical switching is unnecessary because the cooling air is used to reduce the temperature of the motor and its surroundings.

According to the third aspect of the present invention, in the normal state, the opening / closing section is maintained in the closed state by the suction force of the motor, so that the shape memory body or the like for maintaining the opening / closing section in the closed state is provided. Since there is no need to press the opening / closing section against the opening, no stress is applied to the shape memory body downstream of the flow path, so that the sealing property is excellent.

According to the fourth and fifth aspects of the present invention, there is provided opening / closing drive means for opening / closing the opening / closing portion for opening / closing the inflow port in accordance with the difference between the temperature and the external pressure and the negative pressure of the motor. Since the opening is opened and the outside air is taken in by the change of temperature and pressure, it can be used as both a thermo protector and an air protector, so that it is inexpensive.

According to the invention of claim 6 of the present invention, a concave or convex portion is provided at a portion of the opening / closing portion which comes into contact with the inflow port. Protrusions or projections that are fitted and fitted closely are provided, so that the extending distance of the tight surface is increased and the sealing property is excellent.

According to the invention of claim 7 of the present invention, the fins of the shape memory body can detect the temperature at several places around the motor, so that the temperature can be accurately detected and operated.

[Brief description of the drawings]

FIG. 1 is a sectional view of a vacuum cleaner showing first and second embodiments of the present invention.

FIG. 2 is a sectional view of a main part of a vacuum cleaner showing a third embodiment of the present invention.

FIG. 3 is a sectional view of a vacuum cleaner showing a fourth and a fifth embodiment of the present invention.

FIG. 4 is a sectional view of a main part of a vacuum cleaner showing a sixth embodiment of the present invention.

FIG. 5 is a sectional view of a vacuum cleaner showing a seventh embodiment of the present invention.

FIG. 6 is a sectional view of a conventional vacuum cleaner.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 13 Motor 15 Inflow port 16 Packing 19 Shape memory 21 Packing 23 Packing 24 Shape memory 26 Inlet 27 Depression 28 Convex part 29 Fin 32 Dust collection chamber

Claims (7)

[Claims] 1. A dust collecting chamber for collecting dust, a motor having an inlet communicating with the dust collecting chamber, an inlet communicating with the inlet and taking in outside air, and an opening and closing opening and closing the inlet. A vacuum cleaner comprising: a unit for opening and closing the opening / closing unit according to a temperature. 2. A dust collecting chamber for collecting dust, a motor having an air inlet communicating with the dust collecting chamber, an inlet communicating with the air inlet and taking in outside air, and an opening and closing opening and closing the inlet. And a shape memory alloy body, one end of which is disposed near the motor and the other end of which is connected to the opening / closing section, wherein the shape memory alloy body opens the opening / closing section when the temperature exceeds a predetermined value. Machine. 3. The vacuum cleaner according to claim 1, wherein the inflow port is kept closed by a negative pressure of a motor acting on the opening / closing section. 4. A dust collecting chamber for collecting dust, a motor having an air inlet communicating with the dust collecting chamber, an inlet communicating with the air inlet and taking in outside air, and an opening and closing opening and closing the inlet. A vacuum cleaner comprising: a unit; and an opening / closing drive unit that drives the opening / closing unit to open and close according to a difference between a temperature, an outside air pressure, and a negative pressure of a motor. 5. The vacuum cleaner according to claim 4, wherein the opening / closing drive means is formed of a coil-shaped shape memory alloy body. 6. A concave or convex portion is provided at a portion of the opening / closing portion which comes into contact with the inflow port, and a convex or concave portion is provided at a portion of the inflow port where the gasket comes into contact with the concave or convex portion in close contact with the concave or convex portion. Item 6. The vacuum cleaner according to any one of Items 1 to 5. 7. The vacuum cleaner according to claim 2, wherein a plurality of fins are provided on the motor side of the shape memory alloy body.