JPH0847209A - Small generator - Google Patents

Abstract

PURPOSE:To generate electric power from a small generator by attaching an additional member to a shaft from a rotating shaft of an impeller to a driving member thereby providing an energy source for sensors or fine controls. CONSTITUTION:A two-pole or multi-pole magnet 27 is attached to an outer periphery of a rotating shaft 21 near an intermediate portion of two bearings 22 and 23 supporting a rotating shaft 21 erected between a drive side fixed to a rotating shaft of an impeller and a load side comprising a belt coupled to a rotating brush. An inner york 25 with S and N poles of a magnet located oppositely is formed in one united body with a bearing holder 24 retaining two bearings 22 and 23 and, at the same time with the forming, a bobbin portion for winding a wire material is formed. Also, an outer yoke 26 is formed outside the inner yoke 25 and power generating portion 28. The outer yoke 26 is formed as one united body thereby functioning also as a case.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a generator related to a fluid structure, and more particularly to a rotary shaft of an impeller connected to a rotary brush attached to a suction head constituting a suction part of a vacuum cleaner or the like. It relates to a small generator using

[0002]

7 and 8 show an example of a vacuum cleaner and a conventional example of a suction head of a vacuum cleaner to which the present invention is applied. The vacuum cleaner is made movable by engaging a power unit 1 containing a drive source and a storage container 2 containing dust as a unit, transmitting a fluid suction force by rotation of a motor of the drive source, and operating power supply wire. A hose fixing part 4 for joining a hose 3 having a built-in structure to a storage container 2 so that the hose 3 can be fitted freely, and a suction head 5 for sucking dust.
The suction head 5 and the hose 3 are connected to each other by a pipe-shaped suction head operating rod 6 through which dust can pass and an operating portion 8 located near the handle 7 of the operating rod.

Inside the suction head 5, it is located in the inner space of the joint of the operating rod 6, and is approximately at the central position on the line connecting the central portion of the opening 13 of the suction control plate 12 and the central portion of the pipe constituting the operating rod. In addition, the impeller 9 which is rotated by the suction force of the fluid due to the rotation of the motor of the drive source is supported by the casing constituent member of the suction head 5 on its rotation shaft and is rotatable by the suction force. . Further, there is a belt 10 for transmitting the rotational force of the impeller 9 to the rotary brush 11, and when the rotational speed of the impeller 9 changes due to the strength of the suction force of the drive source, the rotary brush 1
The rotation torque of No. 1 is changed to reinforce the dust intake force.

Although the surface state of the suction target surface on which dust, dust, and the like that the suction head 5 contacts is various, the rotating brush 11 contacts the suction target surface while rotating, so that, for example, Even dust that has deeply entered the flock of the carpet and is firmly attached thereto can be forcibly removed from the surface to be sucked by the rotational impact force of the rotary brush on the flock. Even if the carpet is long fibers, the dust adhering to the inside is easily sucked by this impact force.

However, in the conventional suction head, the suction force of the motor of the drive source is changed by changing the suction force of the motor of the drive source by controlling the drive force of the drive source, such as strong, medium, and weak, of the operating portion. Therefore, the suction force is uniformly determined by the above control operation. Alternatively, there is also a method of manually performing the variable operation of the opening area of the suction control plate by knowing what the suction target surface of the suction head is. In any method, in order to follow a minute change in which the state of the suction target surface changes in sequence, the above operation must be performed every time the state of the suction target surface changes, and the operation becomes complicated and practically impossible. . That is, the manual control method in which the torque of the rotating brush interlocked with the impeller and the opening area of the suction control plate are varied cannot be handled by the suction head actively detecting the state of the suction target surface. Therefore, it is desired that the suction head itself secures an energy source, senses the state of the suction target surface, and performs suction control suitable for the state. At this time, even if the sensor means is arranged to detect the above-mentioned state, acquisition of the energy source becomes a problem. Energy sources that need to be replaced frequently, such as batteries, are used for a long time, such as vacuum cleaners, and even in devices used by old people and children who are not familiar with mechanical mechanisms, the above replacement is extremely troublesome. I can't stand it.

[0006]

Therefore, in view of the above situation, the present invention attaches an additional member to the shaft from the rotary shaft of the impeller to the drive member to generate electromotive force as a small-sized power generator, and to generate the above-mentioned sensor or fine sensor. It is intended to be used as an energy source for control.

Further, a small generator is attached without changing the shape and capacity of the conventional suction head, and a magnet disposed on the rotary shaft constituting the generator and an inner yoke facing the magnet with a slight gap. By forming it integrally with the bearing holder with high precision, it is intended to make the structure easy to assemble, hold and check and highly economical.

[0008]

In order to achieve the object, a small generator includes an impeller rotated by a fluid flowed by a drive source, a rotating shaft rotating integrally with the impeller, and the rotating shaft. It is composed of a magnet fixed to the shaft, a yoke surrounding the magnet, and an output coil wound around the yoke.

A vacuum cleaner motor is used as the drive source, and the impeller is rotated by the air by sucking the fluid.

A bearing for rotatably supporting the rotating shaft and a bearing holder for holding the bearing are provided, and the inner yoke and the magnet of the yoke are face-to-face, and the bearing holder and the inner yoke are also provided. The gist of the present invention is that it is characterized by integrally forming and.

[0011]

The small generator comprises a rotating shaft that rotates integrally with the impeller, a magnet fixed to the rotating shaft, a yoke surrounding the magnet, and an output coil wound around the yoke. , An inner yoke of the above yokes,
The magnet and the magnet are opposed to each other. Moreover, since the bearing holder and the inner yoke are integrally formed,
Not only can it be easily arranged in a narrow space such as the inside of the suction head, but also a structure that is easy to assemble and hold and highly economical.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a suction head provided with a small generator of the present invention. This is in contrast to the conventional example shown in FIG. Further, FIG. 2 shows a cross-sectional view of the small generator of the present invention. In the figure, components having the same functions and actions as those in FIGS. 6 and 7 are designated by the same reference numerals and described.

In FIG. 1, an impeller 9 is arranged at a substantially central position inside the suction head 5, and the impeller 9 is rotated by a suction force of a fluid by rotation of a motor of a drive source. The rotating shaft of the impeller 9 coincides with the shaft for transmitting the driving force of the impeller to the rotating brush 11 by the belt 10, and the small generator 20 according to the invention is attached to the belt 10. It should be noted that the bearings at both ends of the bearing holders of the members constituting the small generator 20 are supported by the casing constituent members.

Since the belt 10 rotates the rotating brush 11 which enhances the intake of dust, the impeller 9 and the small generator 2
0 and the rotating brush 11 rotate in relation to each other, and the rotating torque of the rotating brush 11 changes when the rotation speed of the impeller 9 changes depending on the strength of the suction force of the drive source.

The rotational torque applied to the small generator is
Since the state of the suction target surface changes depending on the variation of the load, it can be used as a sensor for detecting the change of the suction target surface from the electromotive force of the small generator. As a result, the present invention can provide a vacuum cleaner that can quickly and automatically detect and control a fine difference in the suction target surface.

In FIG. 2, a belt 10 that connects the drive side, which is composed of the impeller 9 and its rotating shaft, and the rotating brush 11.
A two-pole or multi-pole magnet 27 is attached to the outer periphery of the two bearings 22 and 23 that rotatably support the rotary shaft 21 that is installed between the two bearings.
At this time, the rotating shaft itself may be a magnetized magnet, or the magnetized magnet may be the rotating shaft. For example, a rotary shaft having a base made of a resin obtained by embedding a ferrite magnet piece in a carbon fiber reinforced resin is a rotary shaft having the magnetized magnet.

An inner yoke 25 (stator pole) opposed to the S and N poles of the magnet is integrally molded with the bearing holder 24 in the bearing holder 24 holding the two bearings 22, 23, and at the same time as the molding. A winding bobbin for winding is formed and wound to form an output coil 28. An output terminal 29 is output from the output coil 28 so that the output coil 28 can be used for the various applications described above.

3 and 4 are a plan view and a side view of an embodiment of a 24-pole structure as the inner yoke. Two inner yokes 25 are configured as one set. Each of them comprises an annular collar portion 30, an opening portion 31 opened in the center of the collar portion, a pole 33 which faces the opening portion and serves as a stator pole, and the pair of yokes 25, 25 face each other, and It is assembled in a state in which the poles 33 facing each other are inserted in the spaces 35 between the adjacent poles 33, 33. A U-shaped annular surface is formed to form a frame body of the winding bobbin 34. When the resin is flowed into the bearing holder 24 in such a state of facing each other, the inner yoke 25 is inserted into the bearing holder 24 and solidified in a state where the resin flows in and penetrates through the holes 32 formed in the flange portion 30. The bearing holder 24 is completely inserted inside the bearing holder 24.
Formed as part of the. Moreover, the winding-side inner surfaces of the inner yokes facing each other are coated with resin to form the winding bobbin 34.

As a result, the pole 33 arranged on the shaft surface of the bearing holder facing the rotating shaft is arranged parallel to the rotating shaft 21, and a slight gap is formed between the rotating shaft 21 and the magnet on the rotating shaft. It becomes parallel to each other. That is, since the gap between the magnet and the inner yoke can be accurately maintained, power generation efficiency is improved. Further, since the bobbin portion of the winding is formed at the same time as the above integral molding, a component for insulating the coil from the stator is unnecessary.

In order to further enhance the joining force between the inner yoke inserted in the holes other than the above holes 32 and the bearing holder, the end portion of the pole shown in FIG. 5 can be taken. Fig. 5 (a) shows the pole 3
The tip of 3 is stepped 36 and then resin molded to form a part of the bearing holder 24. By this method, the holding force with the bearing holder resin can be further increased. Figure 5
In (b), the tip of the pole piece 33 is tapered 37, and then the inner yoke is insert-formed in the bearing holder, and the holding force with the resin forming the bearing holder can be increased in the same manner as the stepped processing. When these are used together with the solidification in the state where the resin flows into the hole 32 and penetrates, the joint force between the inner yoke and the bearing holder is further increased.

Further, as shown in FIG. 6 (a), the collar portion 30 may be provided on the entire circumference, but as shown in FIG. 6 (b), it may be in a partially cutout 38 state. In this case, there is an advantage that the inner yoke can be easily taken out from the mold when it is formed by pressing.

An outer yoke 26 is formed outside the inner yoke 25 and the output coil 28 in FIG. 2 so as to surround the output coil 28. The outer yoke 26 may be formed integrally as a case. Since the inner diameter of the outer yoke 26 is larger than the outer diameter of at least one of the left and right bearing holders 24, the outer yoke 26 can be inserted and can be easily assembled.

The outer yoke 26 is inserted from one side after winding the output coil 28, and the minimum inner diameter φD1 of the outer yoke and the outer diameter φD2 of the bearing holder 24 on the side to be inserted are φD1.
If it has a thickness of> φD2, it can be easily assembled.

Alternatively, the outer yoke 26 can be made by curling a magnetic material. If you make it by curling, it is possible to give elasticity,
Assembly is possible even if φD1> φD2 is not satisfied.

The operation of the small generator having the above structure is as follows. The magnetic flux flows through a path of the N pole of the magnet 27, one stator pole and the coil, the other stator pole, and the S pole of the magnet. Therefore, when the magnet rotates, an AC voltage is induced in the output coil 28.

Although FIG. 2 shows an AC generator, it can also be configured as a DC generator. For example, a magnet can be installed on the stator side, a commutator and a yoke wound around it can be attached to the rotary shaft, and a DC voltage can be extracted from the contact brush through the contact brush. Also,
Instead of the commutator, if a pair of slip rings that come into contact with the brushes are arranged on the rotating shaft via an insulating layer, an alternating current can be taken out from the brushes. In this case, by forming the magnet integrally with the bearing holder by insert forming, the gap with the rotor can be accurately maintained.

[0027]

As described above, in the present invention, by providing the generator directly connected to the impeller, it can be used as a sensor installed inside the suction head or an energy source for fine control.

Since the bearing holder and the inner yoke are integrally formed, the gap between the rotary shaft and the magnet and the inner yoke can be accurately maintained. Further, since the bobbin portion of the winding is formed at the same time as the integral molding, a component for insulating the coil and the stator is not required, and the number of components is reduced, which is highly economical.

Since the outer yoke can be inserted from one side, not only the assembly is easy, but also the holding and inspection are easy.

[Brief description of drawings]

FIG. 1 is a view showing a suction head provided with a small generator of the present invention.

FIG. 2 is a cross-sectional view of the small generator of the present invention.

FIG. 3 is a plan view of an example of a 24-pole structure as an inner yoke.

FIG. 4 is a side view of an example of a 24-pole structure as an inner yoke.

FIG. 5 is a cross-sectional view of an essential part when the end portion of the pole piece is processed.

FIG. 6 is an explanatory diagram of a case where an inner yoke of the small generator of the present invention is manufactured.

FIG. 7 shows a block diagram of a vacuum cleaner.

FIG. 8 shows a conventional example of a suction head of a vacuum cleaner.

[Explanation of symbols]

 5 suction head 9 impeller 11 rotating brush 20 small generator 21 rotating shaft 22 bearing 23 bearing 24 bearing holder 25 inner yoke 26 outer yoke 27 magnet 28 output coil

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masao Sunagawa 1-1-1, Higashitaga-cho, Hitachi, Ibaraki Prefecture Living Company Division, Hitachi, Ltd. Bunka Co., Ltd., Hiritsu Manufacturing Co., Ltd.

Claims (3)

[Claims] 1. An impeller rotated by a fluid flowing by a drive source, a rotating shaft rotating integrally with the impeller, a magnet fixed to the rotating shaft, and a yoke surrounding the magnet. A small generator comprising an output coil wound around the yoke. 2. The small generator according to claim 1, wherein the drive source is a vacuum cleaner motor, the fluid is suctioned air, and the impeller is rotated by the air. 3. A bearing, which rotatably supports the rotating shaft, and a bearing holder, which holds the bearing, wherein the inner yoke of the yoke and the magnet are face-to-face, and
The small generator according to claim 1, wherein the bearing holder and the inner yoke are integrally formed.