JPH11113809A - Vacuum cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a small type highly reliable vacuum cleaner which efficiently cools heat radiating electronic parts. SOLUTION: An electric blower 19 generating a suction force of a vacuum cleaner is constituted of an armature 1, an impeller 11 fixed to one end of the shaft 3 of the armature 1, a counter loaded side bracket 5 which rotatably holds the other end of the shaft 3 and covers the armature, and an air guide 10 which rectifies the wind blowing out from the impeller 11. A branch exhaust hole 18 is provided in a part opposite to the air guide 10 of the counter loaded side bracket 5, the blower is so constituted that a part of the exhaust before cooling the armature 1 is exhausted by passing through the air guide 10 by the branch exhaust hole 18, and a control circuit which controls the phase of the electric blower 19 is arranged in the adjacent to the hole 18 so as to cool.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for cooling a heat-generating component in a control circuit of a vacuum cleaner by exhausting an electric blower.

[0002]

2. Description of the Related Art In recent years, vacuum cleaners which have increased the capacity of electric blowers, increased suction power, and have been reduced in size and weight have become mainstream. FIG. 19 shows a conventional vacuum cleaner.
20 will be described.

As shown in the figure, an electric blower 19 built in a vacuum cleaner forms an outer shell from a load-side bracket 6 and a non-load-side bracket 5, and an air guide 10 is mounted above the load-side bracket 6. I have. The shaft 3 of the rotating armature 1 protrudes from the load side bracket 5 side, and the impeller 11 is fixed here. That is, impeller 1
1 is fixed to the shaft 3 by a spacer 13, a washer 14 and a nut 15, and rotates together with the shaft 3. An upper part of the impeller 11 is covered with a casing 12, and an intake hole 12 a is opened in a central front part of the fan 11. The anti-load side bracket 5 holds the brush holder 7, and the brush 8 in the brush holder 7 is in contact with the commutator 2 of the armature 1.
The exhaust port 17 of the non-load-side bracket 5 is open.

The electric blower 19 is fixed by an upper member 50 and a lower member 51 of a cleaner body 49, and a control circuit 52 is disposed on the upper member 50. Above the control circuit 52, there is a cover 53 forming an outer shell of the main body.
Is covered. Fin 5 for radiating heat from bidirectional thyristor 54 which is a heat-generating component mounted on control circuit 52
5 is fixed near the intake port 12a by an upper member 50 and a lower member 51. In other words, the fins 55 are provided in front of the electric blower 19, and the bidirectional thyristor 54 is cooled by blowing the intake air to the fins 55.

In the above configuration, when the electric blower 19 is operated, the impeller 11 rotates at a high speed with the rotation of the armature 1 to generate a suction force, and the fin 55 is blown by the intake air to be cooled. The air sucked in from the inlet 12a blows out from the outer periphery of the fan 11 and enters the air guide 10,
After passing through the electric blower 19 to cool the armature 1, it is discharged from the exhaust port 17.

In Japanese Patent Publication No. 5-5277, as shown in FIG. 21, a radiation fin 20 is inserted into an opening 18 formed in the anti-load bracket 5, and the air guide 1 is provided.
The wind rectified at 0 and applied to the radiating fins 20 for cooling.

[0007]

However, in the above-mentioned conventional configuration, the radiation fins 55 of the bidirectional thyristor 54 arranged on the main body upper member 50 because the intake port 12a is located at the center front part of the electric blower 19 are not provided. It cannot be cooled unless it extends to the vicinity of the intake port 12a. Therefore, the shape of the radiation fin 55 becomes large. In addition, if the intake air leaks from the gap between the fin 55 and the main body upper member 50, the suction force decreases, but there is a problem that it is difficult to air-tighten the radiation fin 55 and the upper member 50.

Further, since the shape of the heat radiation fins 55 becomes large and if the heat radiation fins 55 are mounted at the time of mounting on a board, the heat radiation fins 55 cannot enter a machine for soldering. When the radiating fins 55 are in the post-process, the soldering of the bidirectional thyristor 54 is also in the post-process, so that the stress is not applied to the bidirectional thyristor 54.
There was a problem that the body assemblability also deteriorated.

Further, the radiating fins 55 are connected to the electric blower 19.
The pressure loss at the time of suction causes a drop in suction performance, and is one of the causes of wind noise.

In another prior art (Japanese Patent Publication No. 5-5277), the radiating fins 20 are disposed in the exhaust flow passage so as to obstruct the flow passage.
There is a problem that the exhaust is not performed by the smooth flow and the performance of the electric blower 19 is reduced.

An object of the present invention is to solve the conventional problems as described above, and it is an object of the present invention to improve the assemblability of a vacuum cleaner and to prevent a reduction in suction performance.

[0012]

SUMMARY OF THE INVENTION In order to achieve the above object, the present invention provides a vacuum cleaner in which an air guide is formed by a hole provided in a portion of the electric blower opposed to the air guide of a non-load side bracket of the electric blower. By discharging a part of the passed wind, the heat-generating component can be cooled by the diverted exhaust gas. In addition, tightness is not required for exhaust air blowing.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION
An electric blower built in the main body, an armature, a fan fixed to one end of a shaft of the armature, an anti-load side bracket that holds the other of the shafts rotatably and covers the armature, It is composed of an air guide that rectifies the air flowing out of the fan, and a part of the air that has passed through the air guide is exhausted from a hole provided in a portion of the bracket on the opposite side to the air guide. Heat-generating components can be cooled, and tight air is not required because exhaust air is blown.

According to a second aspect of the present invention, there is provided a control circuit for controlling an electric blower, and a radiating fin for radiating heat of an electronic component constituting the control means is disposed near the hole. Can be made smaller, and mounting on a substrate becomes easier.

According to the third aspect of the present invention, since the cross-sectional shape of the hole is made to follow the flow of the wind flowing out of the air guide, the amount of cooling of the exhaust gas to the radiation fins can be improved.

According to the invention of claim 4 of the present invention, the cooling capacity of the radiating fin can be improved by forming the passage of the exhaust gas discharged from the hole in the radiating fin.

According to the fifth aspect of the present invention, since the exhaust gas discharged from the hole hits the side surface of the radiating fin, the shape of the radiating fin can be further reduced and the mounting thereof can be facilitated.

According to the sixth aspect of the present invention, the radiating fins can be efficiently cooled by shifting the center of the holes and the radiating fins in accordance with the flow of the exhaust gas discharged from the holes.

In the invention according to claim 7 of the present invention, a plurality of fins along the flow of exhaust gas discharged from the holes are integrally provided on the radiating fin, so that the cooling capacity of the radiating fin can be further improved. And the shape of the radiation fin can be reduced. Further, the mounting area of the substrate can be improved, and the size of the substrate and the size of the main body can be reduced.

In the invention according to claim 8 of the present invention, a plurality of holes are provided, and the radiating fins are cooled by wind discharged from the plurality of holes, so that the divided exhaust holes have the same opening area. In addition, the strength of the electric blower can be improved, resonance can be prevented, and noise can be reduced.

According to the ninth aspect of the present invention, the thickness between the holes of the anti-load bracket is made thicker than other portions to maintain the strength, so that vibrations and the like due to exhaust can be suppressed.

According to a tenth aspect of the present invention, a part of an air guide is inserted into a hole, the air is rectified by the wind of the air guide, and then discharged from the hole. It can be made smooth and the cooling effect of the radiation fin can be improved.

According to the eleventh aspect of the present invention, the radiation fin is formed so as to cover the opening edge of the hole.
The dust is not applied to the electronic components, and the reliability of the control circuit can be improved.

According to the twelfth aspect of the present invention, the electronic component is disposed outside the passage of the wind discharged from the hole,
The diverted exhaust does not affect the electronic components and dust does not enter the electronic components, further improving the reliability of the control circuit.

[0025]

【Example】

(Embodiment 1) Hereinafter, Embodiment 1 of the present invention will be described with reference to FIGS.
This will be described with reference to FIG. In FIG. 1, 1 is a commutator 2
The both ends of the shaft 3 of the armature 1 are press-fitted into a bearing 4 and supported by the bearing 4, and the bearing 4 is held by a load-side bracket 6 and a non-load-side bracket 5. Reference numeral 7 denotes a brush holder having a built-in brush 8 that comes into contact with the commutator 2, and is held by the non-load-side bracket 5. 9
Is a field for generating a magnetic field for rotating the armature 2. Reference numeral 10 denotes an air guide formed between the load-side bracket 6 and a fan as a load, preferably an impeller 11.

The upper part of the impeller 11 is covered with a casing 12, and the impeller 11 is fixed to the shaft 3 by a spacer 13, a washer 14 and a nut 15, and rotates together with the shaft 3. The air guide 10 is fixed to the load-side bracket 6 with screws or the like at a position that does not obstruct the air passage, and the load-side bracket 6 and the non-load-side bracket 5 are also fixed with screws. 16 is an intake hole 12a of the casing 12
, And is fixed to the casing 12. Reference numeral 10a denotes a blade portion of the air guide 10, which is in contact with the casing 12. Reference numeral 17 denotes an exhaust hole, which is provided on the non-load-side bracket 5, and reference numeral 18 denotes a branch exhaust hole, which is opened at a rear portion of the air guide 10 of the load-side bracket 6.

In the above configuration, when the electric blower 19 is rotated, the impeller 11 rotates at a high speed together with the rotation of the armature 1 to generate a suction force, and the air sucked from the suction hole 12a is discharged from the outer periphery of the impeller 11 After passing through the blowing air guide 10 and the electric blower 19 to cool the armature 1 and the magnetic field 9, the air is discharged from the exhaust hole 17. Also,
Part of the exhaust gas that has passed through the air guide passes through the branch exhaust hole 18 to discharge cool air.

Therefore, since the cool air before passing through the armature 1 is discharged to the peripheral portion of the electric blower 19, the control circuit of the vacuum cleaner is arranged in the exhausted portion, so that the heat generating component of the control circuit is removed. Cooling can be provided by diverted exhaust.

(Embodiment 2) Hereinafter, Embodiment 2 of the present invention will be described with reference to FIGS. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 3, reference numeral 49 denotes a cleaner main body, and the cleaner main body 49 is formed by an upper member 50 and a lower member 51. The front and rear of the electric blower 19 are fixed by the upper and lower members 50 and 51. 53 is a cover forming the outer shell of the main body. A bidirectional thyristor 54 controls the voltage applied to the electric blower 19 by phase control. Reference numeral 20 denotes a radiating fin, which cools the bidirectional thyristor 54 that generates a large current and generates heat because the fin controls the electric blower 19. Reference numeral 21 denotes a board case which holds a control board 52 on which electronic components constituting a control circuit are mounted.
Is fixed to the electric blower 19.

As shown in FIG. 4, the electric blower 19 is the same as that of the first embodiment. The electric blower 19 is provided with a branch exhaust hole 18 in the upper rear part of the air guide. It is fixed at the back. A board case hole 22 larger than the shunt exhaust hole 18 is opened in the front part of the board case 21 so that the wind from the shunt exhaust hole 18 is taken into the electronic components on the control board 52.

A control board 52 is fixed in the board case 21, and the radiation fins 20 mounted on the control board 52 are mounted near the branch exhaust holes 18 and are efficiently cooled.

According to the above configuration, when the electric blower 19 is rotated, a part of the exhaust gas that has passed through the air guide 10 is exhausted through the branch exhaust hole 18, and the divided exhaust gas passes through the substrate case hole 22 and dissipates the radiation fins. 20 and directly corresponds to the bidirectional thyristor 54. Therefore, the cold air before passing through the armature 1 can cool the control circuit 52 and the bidirectional thyristor 54, which is a heat-generating component, and the size of the heat radiation fins 20 is reduced, which facilitates mounting on the board.

(Embodiment 3) Hereinafter, Embodiment 3 of the present invention will be described with reference to FIGS. The same parts as those in the above embodiments are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 shows the overall structure of the electric blower 19,
FIG. 6A shows a view from the arrow A of the non-load side bracket 5.
FIG. 2B shows only the relationship between the air guide 10 and the branch exhaust hole in FIG.

In FIG. 5, the air generated by the rotation of the impeller 11 is rectified by the air guide 10. The air flow after this rectification is applied to the air guide 1 of the anti-load side bracket 5.
Partially discharged to the outside of the anti-load bracket 5 through the diversion exhaust hole 23 provided in the surface 5a contacting the zero. The radiating fins 20 of the heat-generating components are arranged at the positions where the radiating fins 20 are discharged, and cool the radiating fins 20.

Here, the air guide 10 and the branch exhaust hole 23
Will be described with reference to FIGS. 6A and 6B. A diverting exhaust hole 23 is provided in the non-load side bracket 5 on the contact surface with the air guide 10, and the air guide 1 is provided as shown in FIG.
The wind rectified at 0 is discharged from the branch exhaust hole 23. In this state, the wind rectified by the air guide 10 is discharged in a state following the shape of the air guide 10, and in this state, with the configuration shown in FIG. It will block some of the wind current. This e portion is shown in FIG.
By taking the R and C surfaces along the shape of the air guide 10 as shown in FIG. 2B, the exhaust is smoothed and the cooling effect of the radiation fins 20 is improved. In other words, the rectifying vanes 10 are provided on the back surface of the air guide 10,
a is provided, and the exhaust flowing on the back surface of the air guide 10 has a flow following the shape of the blade 10a. The obstruction of the exhaust gas passing through the hole 23 is removed, thereby increasing the cooling efficiency.

(Embodiment 4) Hereinafter, Embodiment 4 of the present invention will be described with reference to FIG. The same parts as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the drawing, reference numeral 20 denotes a heat radiation fin, which is U-shaped so as to form a flow path of the diverted exhaust gas passing from the air guide 10 through the diverted exhaust hole 18. The bidirectional thyristor 54 is fixed by the heat radiation fin 20, the control board 52, and the screw, and is fixed to the center of the U-shape so as to be directly cooled by the diverted exhaust.

According to the above configuration, when the electric blower 19 is rotated, a part of the exhaust gas passing through the air guide is discharged through the branch exhaust hole 18 to cool air. The diverted exhaust gas passes through the substrate case hole 22 and hits the U-shaped radiating fin 20, and also directly hits the bidirectional thyristor 54. The diverted exhaust gas that enters between the U-shaped radiating fins 20 is discharged from the board case 21 through a U-shaped wind flow path formed by the radiating fins 20. Therefore, the cool air before passing through the armature 1 cools the control circuit and cools the bidirectional thyristor 54, which is a heat-generating component, and the U-shaped radiating fins 20 provide a flow path for the wind, thereby improving the cooling capacity. Is done. Therefore, the shape of the radiation fin 20 is further reduced, and the control board 5
2 becomes easy.

(Embodiment 5) Hereinafter, Embodiment 5 of the present invention will be described with reference to FIGS. The same parts as those in the fourth embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 8, reference numeral 10 denotes an air guide,
It has an angle with respect to the axis 3 of the electric blower 19. Therefore, the diverted exhaust discharged through the air guide 10 is also inclined and has an angle with respect to the shaft 3 and is discharged in an oblique direction.

In FIG. 9, reference numeral 24 denotes a radiating fin of the bidirectional thyristor 54, which is L-shaped so as to meet the diverted exhaust air discharged from the diverted exhaust hole 18. Further, the bidirectional thyristor 54 is fixed near the root of the letter L so as to be cooled directly by the branch exhaust.

According to the above configuration, when the electric blower 19 is rotated, a part of the exhaust gas passing through the air guide 10 is discharged through the branch exhaust hole 18 to cool air. The diverted exhaust gas is discharged obliquely at an angle to the axis 3 of the electric blower 19 through the substrate case hole 22, hits the L-shaped radiating fin 24, and directly hits the bidirectional thyristor 54.
Accordingly, even the L-shaped heat radiation fins 24 are sufficiently cooled, and the shape of the fins 24 is reduced, so that mounting on the substrate is facilitated.

Embodiment 6 Hereinafter, Embodiment 6 of the present invention will be described with reference to FIG. Examples 1, 2 and 3 above
The same reference numerals are given to the same parts as those described above, and the detailed description thereof will be omitted.

In FIG. 10, the blades 10a on the back surface of the air guide 10 for rectifying the air flow generated by the rotation of the impeller 11 are set at the centers of the diverting exhaust holes 18 and the heat dissipating fins 25 of the heat-generating component in the bracket 5 on the non-load side. Is arranged at a position (t dimension) that is shifted along the airflow from. The airflow from the air guide 10 is discharged at a certain angle (for example, like the airflow a). In this state of the airflow a, the center 25a of the radiating fin 25 coincides with the center 18a of the branch exhaust hole 18. If so, the heat radiation effect will be reduced. This is because the airflow from the air guide 10 does not impinge on the entire radiating fin 25, and the cooling air is efficiently exhausted.
Can not be cooled. For this purpose, as described above, the center of the opening hole 18 and the center of the radiation fin 25 are connected to the air guide 10.
By displacing in accordance with the shape (flow path of the airflow), heat is efficiently dissipated. Thus, heat can be efficiently radiated from the heat-generating components, and the reliability can be improved by improving the cooling effect.

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

In the figure, reference numeral 26 denotes a radiation fin, which is fixed to the bidirectional thyristor 54, the control board 52, and the screw. The radiating fins 26 are arranged in the vicinity of the diverted exhaust holes 18 so that the cooling fins 26 are efficiently cooled by the diverted exhaust.
The shape is such that a plurality of walls are provided between the U-shapes. The bidirectional thyristor 54 is disposed at the center of the U-shaped portion so as to be directly cooled by the diverted exhaust gas.

According to the above configuration, when the electric blower 19 is rotated, a part of the cold exhaust air which passes through the air guide 10 and is discharged through the diverted exhaust hole 18 passes through the substrate case hole 22 to make the U air. The radiating fins 26 have a plurality of walls in between, and directly correspond to the bidirectional thyristor 54. Therefore, since the cool air before passing through the armature 1 cools the control circuit and the bidirectional thyristor 54, which is a heat-generating component, and the size of the radiation fins 26 becomes smaller, the mounting on the control board 52 becomes easier. In addition, since the surface area exposed to the wind is large, the cooling performance can be further improved.

Embodiment 8 Hereinafter, Embodiment 8 of the present invention will be described with reference to FIGS. The same parts as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the drawing, reference numerals 27a and 27b denote diversion exhaust holes, at least two or more of which are open to the anti-load bracket 5 at the rear part of the air guide 10 in close proximity. Numeral 28 is a heat radiating fin, and one wall 28a, 28b is set up corresponding to each of the branch exhaust holes 27a, 27b.

According to the above configuration, when the electric blower 19 is rotated, a part of the exhaust gas that has passed through the air guide 10 is discharged as cool air through the branch exhaust holes 27a and 27b. The air exhausted from the branch exhaust hole 27a hits one wall 28a of a U shape through the substrate case hole 22, and the air exhausted from the other branch exhaust hole 27b passes through the substrate case hole 22 as well. Hit the other wall 28b of
In addition, it directly corresponds to the bidirectional thyristor 54. Therefore, the cold air before passing through the armature 1 cools the control circuit and cools the bidirectional thyristor 54, which is a heat-generating component, so that the shape of the heat radiation fins 28 is reduced, and the mounting on the control board 52 is facilitated. In addition, since one branch exhaust hole is dispersed into a plurality of parts, even if they have the same opening area, the strength of the electric blower 19 increases and noise and the like can be reduced.

(Embodiment 9) Hereinafter, Embodiment 9 of the present invention will be described with reference to FIGS. The same parts as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

FIG. 14 shows the overall structure of the electric blower 19, and FIG.
3A shows the relationship between the air guide 10 and a plurality of openings 30 located on the non-load-side bracket 29. FIG.

Here, in FIG. 15A, the wind from the air guide 10 for rectifying the wind from the impeller 11 is partially discharged to the outer shell through the branch exhaust hole 30.
Since a plurality of branch exhaust holes 30 are formed, the dimension between the branch exhaust holes 30 cannot be long (it depends on the size of the cooling fin 28 to be cooled, but is extremely severe when miniaturization is aimed at). , The strength between them decreases. Therefore, the reinforcing portion 5b is provided to increase the thickness of the non-load-side bracket 5, and the thickness is set to, for example, twice the thickness of the portion C to improve the strength. Thereby, vibration when the wind passes through the branch exhaust hole 30 and the like, and resonance of the entire electric blower 19 can be reduced. As a method of further increasing the thickness, as shown in FIG.
By providing the protruding portion 5c inclined in the exhaust gas flow direction in the portion B, the flow of the wind can be further smoothed.

Example 10 Hereinafter, Example 10 of the present invention will be described.
Will be described. The same parts as those in the third embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

First, the configuration will be described with reference to FIG. The blade 10a of the air guide 10 for rectifying the airflow generated by the rotation of the impeller 11 is
However, some of the blades 10b are provided with a convex portion 10c protruding from the branch exhaust hole 18 in the non-load-side bracket 5, and the convex portion 10c is supported by the exhaust branch hole 18. .

Next, the operation will be described. In such a configuration, the airflow rectified by the air guide 10 is discharged from the branch exhaust hole 18 in a smoother state. In other words, the flow of the rectified wind is the largest at the portion along the wall 10d of the blade 10b of the air guide 10, and the flow decreases as the distance from the wall 10d of the blade 10b of the air guide 10 decreases. The flow rate decreases on the opposite surface 10e of the wall surface 10d. Using this state,
The opposite surface 10e of the air guide 10 with less wind flow is brought into contact with the diverting exhaust hole 32, and the diverting exhaust hole 1
By locating 8, the air flow can be smoothly discharged to the outer shell, and the wind discharged from the branch exhaust hole 18 efficiently cools the radiation fins, and effectively dissipates heat of the heat-generating components. be able to.

(Embodiment 11) Embodiment 11 of the present invention will be described below.
Will be described with reference to FIG. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In the figure, reference numeral 33 denotes a heat radiation fin, which is fixed to the bidirectional thyristor 54, the control board 52 and the screw. The radiating fins 33 are arranged in the vicinity of the branch exhaust holes 18 and have a U-shape larger than the branch exhaust holes 18 so as to cover the branch exhaust holes 18. Further, the radiation fins 33 extend from one end of the control board 52 to the other. The bidirectional thyristor 54 is fixed to the center of the U-shape so as to be directly cooled by the diverted exhaust, and the terminal of the bidirectional thyristor 54 is provided with a radiation fin 33 so that it can be mounted on the control board 52.
Is open. Reference numeral 34 denotes a board case exhaust hole, which is opened at a rear portion of the board case 35 with a hole smaller than the U-shaped heat radiation fin 33.

According to the above configuration, the diverted exhaust gas discharged by rotating the electric blower 19 passes through the diverted exhaust hole 18, hits the U-shaped wall of the radiation fin 33, and passes through the U-shaped flow path. . A two-way thyristor 54 is mounted on the flow path, and is directly diverted and exhausted. As it passes through the flow path, there is a substrate case exhaust hole 34 at the rear of the substrate case 35, through which exhaust is performed. Therefore, the diverted exhaust gas is cooled and discharged only on the bidirectional thyristor 54 and the radiation fin 33 which are the heat-generating components. In other words, the diverted exhaust does not hit the other electronic components, so that the dust included in the diverted exhaust can be prevented from being applied to the electronic components other than the heat-generating components.

Embodiment 12 Hereinafter, Embodiment 12 of the present invention will be described.
Will be described. The same parts as those in the second embodiment are denoted by the same reference numerals, and detailed description thereof will be omitted.

In FIG. 18, a bidirectional thyristor 54 is mounted on the outer wall of a U-shaped radiating fin 36 extending to the end of the control board 52.

According to the above configuration, the diverted exhaust gas discharged by rotating the electric blower 19 passes through the substrate case hole 22, hits the U-shaped wall of the radiation fin 36, and passes through the U-shaped flow path. . When passing through the flow path, the substrate case 35
There is a substrate case exhaust hole 34 at the rear part of which is exhausted therethrough. When passing through the flow path, the radiation fins 36
Is cooled, and the bidirectional thyristor 54 fixed to the U-shaped wall is also cooled. Therefore, the diverted exhaust gas is cooled and discharged only on the radiation fin 36. In other words, electronic components such as the bidirectional thyristor 54 are not subjected to the diverted exhaust at all, so that dust contained in the diverted exhaust can be prevented from hitting the electronic components.

[0065]

As is apparent from the above embodiment, according to the first aspect of the present invention, the air guide passes through the air guide by the hole provided in the portion of the non-load side bracket facing the air guide. Part of the exhaust gas can be diverted and discharged as cold air, and the surrounding control circuit and the outer shell of the electric blower can be cooled.

According to the second aspect of the present invention, since the radiating fins are arranged near the holes, a part of the exhaust gas passing through the air guide corresponds to the radiating fins and directly generates heat. Also hit. Therefore, since the cool air before passing through the armature can cool the control circuit and cool the heat-generating components, the shape of the radiating fins becomes smaller and the mounting on the board becomes easier.

According to the third aspect of the present invention, since the cross-sectional shape of the hole is made to follow the flow of the wind flowing out of the air guide, the loss of the wind when passing through the hole can be reduced. In addition, the heat-generating components can be efficiently cooled, thereby improving reliability. Wind noise is also reduced, and a low-noise electric blower can be provided.

According to the fourth aspect of the present invention, since the passage of the exhaust gas discharged from the hole is formed in the radiation fin, the exhaust gas passing through the air guide cools the control circuit and generates heat. To cool the bidirectional thyristor,
In addition, since the flow path of the wind is formed by the radiation fins, the cooling capacity is improved. Therefore, the shape of the radiation fin becomes smaller,
Board mounting becomes easy.

According to the fifth aspect of the present invention, since the exhaust gas discharged from the hole is made to hit the side surface of the radiating fin, it is sufficient to use not only the U-shaped but also the L-shaped radiating fin. Cooling is performed, and the shape of the radiation fins is reduced, so that mounting on the substrate is facilitated.

According to the sixth aspect of the present invention, the center of the hole and the center of the radiation fin are shifted in accordance with the flow of the exhaust gas discharged from the hole. Even if it is discharged obliquely to the center, it efficiently hits the radiating fins. Therefore, since the cooling fins can be cooled with the total amount of exhausted air, the heat generating components can be radiated and cooled very efficiently.

According to the seventh aspect of the present invention, since a plurality of fins are provided integrally with the heat radiation fins along the flow of exhaust gas discharged from the hole, the exhaust gas from the hole is provided with a plurality of fins. Radiating fin having Therefore, the cool air cools the control circuit and cools the bidirectional thyristor, which is a heat-generating component, and the shape of the radiating fins is reduced, which not only facilitates board mounting but also increases the surface area exposed to the wind. Cooling performance can be improved.

According to the eighth aspect of the present invention, a plurality of holes are provided, and the radiating fins are cooled by wind discharged from the plurality of holes, so that the holes have the same opening area. The strength of the electric blower is increased, and noise and the like can be reduced.

According to the ninth aspect of the present invention, by increasing the plate thickness between the plurality of holes, vibrations generated when wind passes through the holes, chatter due to wind noise, and the like are reduced. Since it can be suppressed and the strength can be maintained, very low noise exhaust can be achieved.

According to the tenth aspect of the present invention, since a part of the air guide is formed into a shape capable of being inserted into the hole, the air flow rectified by the air guide can be smoothly guided to the hole. In addition, since there is no structure that obstructs the flow, wind noise can be further reduced.

According to the eleventh aspect of the present invention, since the opening fin of the hole is covered with the radiating fin, the exhaust from the hole corresponds to only the radiating fin. The dust contained in the exhaust does not hit the electronic components, and the reliability of the control circuit can be improved.

Further, according to the twelfth aspect of the present invention, since the electronic components are arranged other than the passage of the wind discharged from the hole, no exhaust is applied to the electronic components. The dust contained is not applied to the electronic components, and the reliability of the control circuit can be further improved.

[Brief description of the drawings]

FIG. 1 is a partially cutaway side view of an electric blower according to a first embodiment of the present invention.

FIG. 2 is a rear view of the electric blower.

FIG. 3 is a sectional view of a vacuum cleaner according to a second embodiment of the present invention.

FIG. 4 is an exploded rear sectional view of the vacuum cleaner.

FIG. 5 is a partially cutaway side view of an electric blower according to a third embodiment of the present invention.

6A is a diagram showing a positional relationship between an air guide of the electric blower and a diverting exhaust hole. FIG. 6B is a cross-sectional view around the diverting exhaust hole of the electric blower. Diagram explaining the relationship

FIG. 7 is a perspective view of a control circuit of a vacuum cleaner according to a fourth embodiment of the present invention.

FIG. 8 is a plan sectional view of a vacuum cleaner according to a fifth embodiment of the present invention.

FIG. 9 is a perspective view of a control circuit of the vacuum cleaner.

FIG. 10 is a sectional view showing a positional relationship between an air guide and a radiation fin of a vacuum cleaner according to a sixth embodiment of the present invention.

FIG. 11 is a perspective view of a control circuit of a vacuum cleaner according to a seventh embodiment of the present invention.

FIG. 12 is an exploded rear sectional view of a vacuum cleaner according to an eighth embodiment of the present invention.

FIG. 13 is a perspective view of a control circuit of the vacuum cleaner.

FIG. 14 is a partially cutaway side view of an electric blower according to a ninth embodiment of the present invention.

FIG. 15A is a cross-sectional view showing a positional relationship between an air guide and a radiation fin of the electric blower. FIG. 15B is a cross-sectional view showing a positional relationship between an air guide and a radiation fin of the electric blower.

FIG. 16 is a sectional view showing a positional relationship between an air guide and a radiation fin of an electric blower according to Embodiment 10 of the present invention.

FIG. 17 is an exploded perspective view of a control circuit and a board case of a vacuum cleaner according to Embodiment 11 of the present invention.

FIG. 18 is a perspective view of a control circuit of a vacuum cleaner according to Embodiment 12 of the present invention.

FIG. 19 is a partially cutaway side view of a conventional electric blower for a vacuum cleaner.

FIG. 20 is a sectional view of a conventional vacuum cleaner.

FIG. 21 is a partially cutaway side view of another conventional electric blower for a vacuum cleaner.

[Explanation of symbols]

5, 29 anti-load bracket 6 load bracket 10 air guide 11 impeller (fan) 18, 23, 27a, 27b, 30, 32 branch exhaust hole 19 electric blower 20, 24, 25, 26, 28, 33, 36 radiation fin 52 control board

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Yoshitaka Murata Inventor 1006 Kazuma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Inventor Kazuhisa Morishita 1006 Kadoma Kazuma Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Tsuyoshi Nishimura 1006 Kadoma Kadoma, Kadoma City, Osaka Prefecture, Japan (72) Inventor Hidetoshi Imai 1006 Odaka Kadoma, Kadoma City, Osaka Prefecture Inside Matsushita Electric Industrial Co., Ltd. (72) Inventor Masaki Takahashi, Osaka Prefecture 1006 Kadoma Kadoma Matsushita Electric Industrial Co., Ltd. (72) Inventor Hiroyuki Senoo 1006 Kadoma Kadoma, Osaka Pref.Matsushita Electric Industrial Co., Ltd. (72) Yoshitaka Hayami 1006 Kadoma Kadoma, Osaka Pref.Matsushita (72) Inventor Nobuhiro Hayashi 1006 Kadoma Kadoma, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. The Corporation

Claims (12)

[Claims] 1. An electric blower incorporated in a main body, an armature, a fan fixed to one end of a shaft of the armature, and a non-load side for holding the other of the shafts rotatably and covering the armature. A bracket and an air guide for rectifying the air flowing out of the fan, and a part of the air passing through the air guide is discharged from a hole provided in a portion of the anti-load side bracket facing the air guide. Vacuum cleaner. 2. A control circuit for controlling the electric blower is provided.
2. A vacuum cleaner according to claim 1, wherein a radiating fin for radiating heat of the electronic component constituting said control means is arranged near the hole. 3. The vacuum cleaner according to claim 1, wherein a cross-sectional shape of the hole is adapted to a flow of wind flowing out of the air guide. 4. The vacuum cleaner according to claim 2, wherein a passage for exhaust gas discharged from the hole is formed in the radiation fin. 5. The vacuum cleaner according to claim 2, wherein the exhaust gas discharged from the hole hits a side surface of the radiation fin. 6. According to the flow of exhaust gas discharged from the hole,
The center of the hole and the center of the radiation fin are shifted.
6. The vacuum cleaner according to any one of 5 above. 7. The vacuum cleaner according to claim 2, wherein a plurality of fins along the flow of exhaust gas discharged from the holes are provided integrally with the radiation fins. 8. A plurality of holes are provided, and the radiating fins are cooled by wind discharged from the plurality of holes.
The vacuum cleaner according to claim 1. 9. The vacuum cleaner according to claim 8, wherein the thickness between the holes of the anti-load bracket is greater than other portions. 10. The vacuum cleaner according to claim 1, wherein a part of the air guide is inserted into the hole, the air is rectified by the wind of the air guide, and then discharged from the hole. . 11. The vacuum cleaner according to claim 2, wherein the radiation fin is formed so as to cover an opening edge of the hole. 12. The vacuum cleaner according to claim 1, wherein an electronic component is disposed outside a passage of the wind discharged from the hole.