JPH0532047Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to an electric suction tool for a vacuum cleaner, and particularly relates to a built-in location of a drive motor for an electric suction port.

BACKGROUND ART A conventional vacuum cleaner of this type has a structure as shown in FIG. 4, for example.

That is, an intake hole (not shown) is located near the center of the upper surface of the motor chamber 3 in which the motor 2 of the suction device main body 1 is built.
The cooling air is taken in from the outside, and the electric motor 2
The cooling air that has been cooled passes through the power transmission chamber 4 and merges with the ventilation path 5. Then, air containing dust passes through the suction port 6 and is sucked from the joint 7 into the cleaner body.

Problems to be Solved by the Invention In the electric vacuum cleaner suction device configured as described above, the amount of air flowing is only due to the pressure difference between atmospheric pressure and negative pressure in the ventilation path, so sufficient self-cooling cannot be achieved. It disappears. In addition, the power transmission chamber and the ventilation path meet through a communication hole, but if thread or cotton waste is inhaled, it will block the communication hole and prevent cooling air from flowing into the motor room, making self-cooling impossible. Otherwise, the allowable temperature rise limit of the motor will be exceeded.
Furthermore, since the air intake holes are located in the upper outer shell, there is a risk that dust may accumulate in the air intake holes, preventing cooling air from flowing through them. Furthermore, since the suction device is taken in from the upper part of the main body, the amount of inflow from the suction port is reduced accordingly, leading to a reduction in suction capacity.

Means for Solving the Problems In order to solve the above problems, the present invention includes a suction tool main body with a built-in rotating brush and a suction port on the bottom, a built-in electric motor for driving the rotary brush, and a built-in suction tool body with a built-in rotating brush and a suction port on the bottom. A joint that is provided at the rear of the main body so as to be freely downwardly downward and connects the extension pipe and the suction port via the main air passage inside the main body, and a joint that is provided on one side of the interior of this joint to separate the main air passage and the electric motor. a partition plate, the joint is provided with a suction hole that connects the suction port and the main air passage, and a ventilation hole that connects the suction port and the electric motor side inside the joint, and on the upstream side of the ventilation hole. In addition to disposing a filter, a return hole is provided on the downstream side of the partition plate through which air flowing from the ventilation hole and passing around the electric blower returns to the main ventilation path.

Effects The effects of the present invention with the above configuration are as follows. That is, since the air for cooling the electric blower is returned to the intake main path through the suction port, the electric blower can be reliably cooled without reducing the suction force. Furthermore, since a partition plate is provided between the main ventilation path and the motor, and a filter is placed upstream of the ventilation hole, the motor will not be contaminated by dust or the like.

Embodiments Hereinafter, embodiments will be described based on the drawings.

In FIGS. 1 to 3, a vacuum cleaner 8 includes a vacuum cleaner main body 9 having a built-in suction source, and a suction device connected to the main body 9 by a hose 10 and an extension pipe 11, which runs on a surface to be cleaned and sucks in dust. It consists of a main body 12.

The suction device main body 12 has a suction port 15 defined in front of its outer shell 13 by a partition wall 14, and a rotary brush 16 with bristles flocked in a spiral shape inside the suction port 15 is attached to both ends by bearings 17, A pulley 18 is installed on the axis of the rotating brush 16 and is rotatably supported by the rotating brush 17'.
A belt 21 is wound around the rotary brush 16 and a pulley 20 on the output shaft of the electric motor 19, so that rotational force is applied to the rotating brush 16. The suction port 15 is a suction hole 2 formed in the center of the partition wall 14.
2 to a T-shaped joint 23 that can be depressed freely. Since the electric motor 19 is installed inside the joint 23 on one side, the electric motor 19 is connected to the outer shell 1 through a supporter 24 made of foamed rubber or the like.
3, and the rotating shaft of the joint 23 and the center of the electric motor 19 are provided on the same axis, so that the joint 23 can be moved downwardly and at the same time, the electric motor 19 is provided on the ventilation path.

Furthermore, the joint 23 is connected to the main air passage and the electric blower 1
A partition plate 25 is provided between the motor 19 and the suction port 15 to prevent foreign objects from hitting the motor 19. Reference numeral 25' denotes a return hole provided in the partition plate 25, through which the air that has cooled the motor 19 returns to the main air passage. An upper member 26 and a front upper member 27 are provided to keep the suction port 15 and the suction hole 22 airtight, and a suction opening 28 is formed at a portion of the main body member 13 corresponding to the rotating brush 16, which allows the rotating brush 16 to come into contact with the surface to be cleaned and protrude to an extent that does not impair the function of picking up dust. In the drawing, reference numeral 29 denotes a rear running wheel, 30 denotes a front running wheel, 31 denotes a cord that supplies power to the motor 19 built into the suction tool main body 12, 32 denotes a wire that supplies power to the motor 19 built into the suction tool main body 12, and 33 denotes a wire that supplies power to the motor 19 built into the suction tool main body 12.
indicates a lead wire connecting to the electric motor 19, 33 indicates a bumper provided on the outer peripheral side of the outer shell 13 of the suction tool body 12, and 34 indicates a filter for preventing dust from entering the electric motor 19, which is arranged upstream of an air vent (not shown) provided adjacent to the suction port 22.

Next, when the vacuum cleaner is operated, the flow of cooling air in the above embodiment is caused by the vacuum cleaner body 9 passing through the hose 1.
0, negative pressure is generated in the extension pipe 11 and the suction port 15 of the suction device main body 12, and the dust on the surface to be cleaned is sucked into the vacuum cleaner main body 9 through the suction hole 22 and the joint 23. At the same time, suction air from which dust has been removed by the filter 34 flows through the ventilation hole on the motor 19 side, and returns to the main return path through the return path 25' where the motor 19 is forcibly cooled. Therefore, suction power is not sacrificed for cooling the electric motor 19, and dust does not accumulate on the electric motor 19. Furthermore, as shown in FIG. 1, since the electric motor 19 is inserted into the joint 23, the width of the suction tool main body 12 is reduced by the amount that the electric motor 19 is inserted into the joint 23. Because it is closer to the center, the overall balance is better, making it harder for the weight to turn in the direction of weight when driving, improving driving performance.

Effects of the Invention According to the invention as described above, since air for cooling the electric blower is taken in through the suction port and returned to the main return path, the electric blower can be reliably cooled without reducing the suction force. In addition, a partition plate is provided between the main ventilation path and the motor, and a filter is placed upstream of the ventilation hole, so dust and other particles do not contaminate the motor. It is possible to provide an electric suction device for a vacuum cleaner.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of an electric suction tool showing an embodiment of the present invention, FIG. 2 is a vertical cross-sectional view, FIG. 3 is an overall side view, and FIG. 4 is a cross-sectional view of a conventional example. 12... Suction tool body, 16... Rotating brush, 1
9...Electric motor, 23...Coupling.

Claims (1)

[Scope of utility model registration request] A suction tool body with a built-in rotating brush and a suction port on the bottom, a built-in electric motor for driving the rotating brush, and a suction tool body that is installed at the rear of the suction tool body so as to be freely downwardly extended and extends through an internal main air passage. The joint includes a joint that connects the pipe and the suction port, and a partition plate that is provided on one side of the inside of the joint and separates the main air passage from the electric motor, and the joint has a joint that connects the suction port and the main air passage. A suction hole connecting the suction port and a ventilation hole connecting the suction port and the motor side inside the joint are arranged, and a filter is arranged on the upstream side of this ventilation hole, and the air flows through the ventilation hole on the downstream side of the partition plate. An electric suction tool for a vacuum cleaner, comprising a return hole through which airflow that has passed around the electric blower returns to the main air passage.