JPH0386131A - Vacuum cleaner - Google Patents

Abstract

PURPOSE:To improve heat insulating efficiency, to attach a muffler function, and to protect an electric circuit part from dust by enclosing the motor of a blower by forming a radiator which cools the circuit element of the electric circuit part cylindrically, and separating the electric circuit part from a blower room by arranging it outside. CONSTITUTION:When the motor 43 of a cleaner main body 10 is revolved, the blower 41 is driven, and an air flow advancing from a suction port 12 side to a distributed exhausting port 16 side is formed. When cleaning is progressed and the time elapses and heat generated in the motor 43, etc., is accumulated in the circuit element 47 of the electrical circuit part 45, an adverse effect is given on electrical characteristic. However, the air with low temperature flows in the blower room 40 via a dust collecting room 20, and is splashed on the internal plane of a heat insulating board 44, which cools radiation, and is exhausted from the exhaust port 16. At this time, a rotating tone generated simultaneously is multipath-reflected on the inner peripheral plane of the heat insulating board 44, then, is muffled. Meanwhile, the electric circuit part 45 composed of a printed circuit board 46 is placed outside a blower path by being separated from the blower room 40 by the partition of the heat insulating board 44. Therefore, even when dust or the like flows out, heat generation in the circuit element due to the accumulation of the dust can be prevented from occurring.

Description

[Detailed description of the invention] [Industrial application field] The present invention relates to a household vacuum cleaner.

[Prior Art] If the motor for the electric blower in a vacuum cleaner is controlled by a so-called inverter, it will not only have a brushless configuration, but also
It has various features such as being unaffected by power supply frequency. However, since semiconductor circuit elements such as transistors and thyristors are used in the control circuit, special consideration must be given to heat dissipation to prevent the temperature of the electric circuit section from rising. On the other hand, in conventional devices of this type, an L-shaped aluminum heat sink is installed near the exhaust port of the ventilation chamber, and circuit elements are mounted on this heat sink, and virtually no consideration is given to heat radiation measures. The reality was that they were not.

[Problems to be Solved by the Invention] As described above, in conventional vacuum cleaners, little consideration has been given to heat dissipation measures for the electric circuit section. As a result, the temperature of the circuit elements of the electric circuit section may rise, resulting in poor output characteristics and the like.

Furthermore, if dust accumulates in the dust collection chamber or the filter becomes clogged, the temperature generated by the motor increases and is transmitted to the circuit elements, causing problems such as malfunctions and decreased control accuracy. In addition, the ventilation chamber where the electric blower is located communicates with the dust collection chamber, and if the dust collection bag or partition filter is torn, dust will adhere to the circuit elements of the electric circuit section and adversely affect heat dissipation. It turns out.

The present invention was made in view of the current situation, and its purpose is to provide an electrical system that has good heat dissipation efficiency, has a function of silencing the driving noise of the motor, and has an electrical circuit section that is not affected by dust. Our goal is to provide vacuum cleaners.

[Means for Solving the Problems] The present invention provides a cylindrical heat sink for cooling circuit elements of an electric circuit section to surround the motor of an electric blower, and an electric circuit section outside the heat sink. This is a vacuum cleaner that is placed and isolated from the ventilation chamber.

[Function] When the motor of the electric blower in the main body is rotated, the fan rotates and the air sucked from the dust collection chamber is blown onto the inner surface of the heat radiator. The blown air absorbs heat from the radiator and is discharged from the body through the exhaust port. At this time, since the electric motor is surrounded by the heat radiator, the generated rotational sound is reflected multiple times on the inner peripheral surface of the heat radiator, the propagation path becomes longer, the sound is muffled, and then the sound is emitted outside the main body.

On the other hand, an electric circuit section consisting of a printed circuit board to which circuit elements are attached is located outside the heat sink and isolated from the ventilation chamber. Therefore, even if the dust from the dust collection bag leaks, the dust will not adhere to or accumulate on the electric circuit and will not be affected.

[Embodiment] Fig. 1 is an explanatory view of the configuration of an embodiment of the present invention, Fig. 2 is an explanatory view of the rear side of the main body, and Fig. 3 is an explanatory view of the basic structure inside the main body.

In Figures 1 and 2, (1) is the floor surface indicating a wooden floor or carpet floor, (2> is the floor brush, (3) is the extension pipe, (4)
is a flexible tube. The tip of the tube (4) is a dogleg-shaped grip (8) with a hand switch (5).
is formed, and the original part becomes the insertion part <7). (
10) is the main body of the vacuum cleaner placed on the floor (1). (11) is a lid, (12) is an inlet into which the insertion part (7) is inserted, (13) is a large and small wheel, and (14) is a cord with a plug attached to its tip.

Further, (15) is a centralized exhaust port formed from a single hole provided on the back surface of the main body (10), and (1B) is a distributed exhaust port formed from a plurality of holes.

The internal structure of the main body (10) is shown in FIG.

In Figure 3, (20) is the dust collection room, <30> is the code room, (
40) is a ventilation chamber, and each of these chambers is divided inside the main body <lO). In the partition between the dust collection chamber (20> and the ventilation chamber (40)) and inside the exhaust port (1G) of the ventilation chamber (40), there is a filter (P) for fine dust made of foamable synthetic resin, etc. (21> is a dust collection bag stored in the dust collection chamber (20) that can be replaced by opening the lid (11>), (31) is a dust collection bag installed in the cord chamber (30) and a cord (
14). (4I) is the ventilation chamber (
The electric blower attached to the fan (40)
and an electric motor (43>). Also, (44) is a heat sink. The heat sink (44) is formed in a cylindrical shape and surrounds the electric motor (43>). (45) is a heat sink (44). 43
), (46) is a printed circuit board constituting the electric circuit (45), and (47) is a circuit element such as a thyristor. The electric circuit section (45) is provided on the outside of the heat sink (44) and is isolated from the ventilation chamber (40), and the circuit element (47) in the negative section is located outside the heat sink (44).
) are in contact with or embedded in and thermally bonded.

The operation of the vacuum cleaner of the present invention configured as described above will be explained next.

When you insert the plug of the cord (14) into the ACloo V outlet and turn on the hand switch (5), the electric motor (43) inside the main body (io) of the vacuum cleaner will rotate.The rotation of the electric motor (43) will cause the electric The blower (41) is driven, and as shown by the arrow, the air is sucked into the main body (lO) from the suction port (12) side, passes through the dust collection chamber (20) and the ventilation chamber (40>), and is then distributed to the dispersion exhaust port (lB). ) an airflow is formed towards the side.

Here, if you place the floor brush (2) on the floor surface (1) and slide it back and forth, dirt and dust on the floor surface (1) will be removed from the floor brush (2).
and the floor surface (L).

Inhaled dust is removed from the extension pipe (3) and tube (4).
The dust is collected in the dust collection bag (21) housed in the dust collection chamber (20) of the main body (10) through the dust collection chamber (20). The exhaust after dust collection is 2
Microscopic components of dust are captured by the filters (F) at several locations, and clean air after filtration is released from the dispersion exhaust port (1B) to the main body (10
> be spit out outside.

As cleaning progresses and time elapses, the stator coil, power transformer, etc. of the electric motor (43) generate heat over time. If the generated heat or the heat generated by itself remains in the circuit element (47> of the electric circuit section (45)), it will have an adverse effect on the electrical characteristics.However, as mentioned above, the main body (10) The low temperature air of the air flow shown by the arrow generated in the air flows through the dust collection chamber (20) to the ventilation chamber (40)
and is then blown onto the inner surface of the heat sink (44). The blown air takes away the heat from the heat sink (44),
It is discharged from the main body (lO) through the exhaust port (lB).At this time, since the electric motor (43) is surrounded by the heat sink (44), the generated rotation sound is discharged from the inner circumference of the heat sink (44). The sound is multi-reflected by the surface, the propagation path becomes longer and the sound is muffled, and then the main body (
IO〉.

That is, the heat sink (44) surrounding the electric motor (48)
serves two functions: heat dissipation and sound silencing.

On the other hand, an electric circuit section (made up of a printed circuit board (46))
45) is divided by a heat sink (44〉) into a ventilation chamber (40).
It is isolated from the air and outside the ventilation path. Therefore, the dust collection bag (
Even if the container 21> is torn or becomes full and the dust flows out downstream, there is no fear that the circuit elements will generate heat due to the accumulation of dust. Therefore, according to this embodiment, the electric blower (41
) noise can be reduced, and the circuit elements can be protected from sucked-in dust.

In addition, in the above-mentioned embodiment, a separate type vacuum cleaner having a structure in which the main body (10) of the vacuum cleaner and the floor brush (2> are connected by an extension pipe (3) and a tube (4>) was illustrated and explained. ,
The present invention can also be applied to an integral type, handheld type, or pot type vacuum cleaner in which the suction part and the main body are integrated. Also, in Figure 3, the cord room (30) and the ventilation room (
Although the chambers (30) and (40) are shown horizontally adjacent to each other, the present invention can also be applied to a case where the chambers (30) and (40) are arranged in a vertical relationship. Furthermore, although the inlet (12) is provided on the top surface of the main body (10), it may also be provided on the front side of the main body (TO). The heat dissipating body (44) may be a polygonal rectangular tube.In particular, if it is configured as a square tube, it is extremely convenient for attaching an electric circuit section made of a printed circuit board.

[Effects of the Invention] As described above, the present invention provides a vacuum cleaner in which the heat radiator for cooling the circuit elements of the electric circuit portion is formed into a cylindrical shape, and the motor of the electric blower is surrounded. In addition, the electric circuit section was arranged around the outer periphery of the heat radiator and provided outside the ventilation path. As a result, the low-temperature air flow generated by the rotation of the electric motor flows into the ventilation chamber, is blown against the inner surface of the heat sink, absorbs heat, and is discharged to the outside through the exhaust port. At the same time, the noise generated from the electric motor is reflected multiple times on the inner surface of the heat radiator, is muffled, and then radiated outside the main body. Moreover, while the electric circuit section is effectively radiated by the heat radiator, it is not adversely affected by dust.

Therefore, according to the present invention, it is possible to provide a vacuum cleaner with a simple configuration, excellent cooling effect, and several excellent features such as quiet driving noise.

[Brief explanation of drawings]

FIG. 1 is an explanatory view of the configuration of an embodiment of the present invention, FIG. 2 is an explanatory view of the rear side of the main body, and FIG. 3 is an explanatory view of the basic structure inside the main body. In the drawing, (1) is the floor surface, (2) is the floor brush, and (3) is the floor surface.
) is the extension pipe, (4> is the tube, (5) is the hand switch, (6) is the grip part, (7) is the insertion part, (10) is the main body of the vacuum cleaner, (11) is the lid, (12) is the ) is the inlet, (13
) is the wheel, (14) is the cord, (i5) is the central exhaust port,
(16) is a distributed exhaust port, (20) is a dust collection chamber, (21) is a dust collection bag, (3o) is a cord chamber, (31) is a reel, (4
o) is a ventilation chamber, (41) is an electric blower, (42) is a fan, (43) is an electric motor, (44) is a heat sink, (45) is an electric circuit section, (46) is a printed circuit board, (47> denotes a circuit element, and (P) denotes a filter. Note that the same reference numerals in the figures indicate the same or corresponding parts.

Claims (1)

[Scope of Claims] A dust collection chamber provided with an inlet to which a cleaning hose is connected and in which a dust collection bag is accommodated when the lid is opened, and an exhaust port communicated with the dust collection chamber provided with an electric blower inside. In the vacuum cleaner, the vacuum cleaner has a main body including an air blowing chamber in which the electric blower is arranged, and a heat dissipating body that cools circuit elements of an electric circuit section that controls the electric blower is configured in a cylindrical shape to cool the electric motor of the electric blower. A vacuum cleaner characterized in that the electric circuit section is placed outside the heat radiator and isolated from the ventilation chamber.