JP3014330U - Rainproof and waterproof structure in commutator motor motor frame suitable for use in core drills - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a rainproof and waterproof structure for a motor frame of a commutator motor of a machine or appliance used outdoors or in a state where water may be splashed indoors. [Structure] The rainproof and waterproof structure of the motor frame of the commutator motor is such that the motor (3) is attached to the upper part of the motor frame (3).
An umbrella-shaped cover (4) which is fixed so as to form a double structure by covering the upper end of the umbrella-shaped cover (4) and a gap between the umbrella-shaped cover (4) and the motor frame (3). It is provided with an outside air suction port (7) provided and secured. The commutator motor is protected against ingress of water from the top and sides.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a rainproof / waterproof structure in a motor frame of a commutator motor, which is suitable for use in a machine / equipment used outdoors, or a machine / equipment used indoors where water may splash. . INDUSTRIAL APPLICABILITY The present invention is particularly suitable for a rainproof / waterproof structure in a core drill for piercing work for heating and cooling of buildings, piping for electricity, water, gas, etc., or for reinforced concrete piercing work for structures such as dams and bridges.

[0002]

[Prior art]

 Conventionally, commutator motors used for core drills and the like have been provided with an opening as an intake port at the top or side of the motor frame because it is necessary to cool the inside of the motor, which becomes hot during operation. Therefore, if the motor is splashed with water for some reason during work, or if there is a sudden rainfall during outdoor work, the water or rainwater may directly enter the live parts inside the motor and cause an electrical leakage accident. It was causing it.

[0003]

[Problems to be solved by the device]

 If water is applied to the current-carrying parts inside the motor due to rainfall or sudden conditions during the drilling work using the core drill, the current-carrying parts will be short-circuited, resulting in an electrical leakage accident. As described above, the present invention has a structure in which water does not directly enter the energized parts even if water is splashed on the motor due to sudden rain or sudden conditions, so that the operator can detect the danger. In this way, it is possible to secure a time margin for turning off the motor. Since the core drill is a machine that uses high-voltage power and is operated directly by the operator's hands, it must have a safe structure that can prevent accidents involving human life, and ensuring this is a top priority. Is.

[0004]

[Means for Solving the Problems]

 The present invention is a rainproof and waterproof structure for a commutator motor (2) in which a motor frame (3) has an intake fan (5) inside and an exhaust port (8) on a lower end side surface. Then, an umbrella-shaped cover (4) fixed to the upper part of the motor frame (3) so as to cover the upper end of the motor (3) and to have a double structure, and the cover (4). 4) and the motor frame (3) are provided with a rainproof and waterproof structure in the motor frame of the commutator motor, which is provided with an outside air suction port (7) provided by ensuring a gap.

[0005]

[Action]

 The umbrella-shaped cover (4) of the present invention prevents water from entering the inside of the motor, and sucks outside air provided with a gap between the cover (4) and the motor frame (3). The mouth (7) sucks the outside air obliquely upward from under the cover. The outside air sucked by the rotation of the rotor (6) having an intake fan is discharged through the exhaust port (8) while cooling the inside of the motor. Due to the rain-proof and waterproof structure of the motor frame of the motor for core drills of the present invention, there is no danger of instantaneous electric leakage when water hits the motor in various modes. It will be possible to secure as much time as possible.

[0006]

【Example】

 An embodiment of the present invention will be described with reference to the drawings. 1 and 2 show an embodiment of the present invention. FIG. 1 is a side view of the entire core drill, and FIG. 2 is a sectional view of a commutator motor used in the core drill. In FIG. 1, reference numeral (1) indicates a core drill, and (2) indicates a commutator motor. The commutator motor is adapted to drive the core bit (11) to rotate. The commutator motor shown in FIG. 2 includes a rotor (6) having an intake fan (5) held by a bearing (9), a stator (10), and the like inside a motor frame (3). It The feature of the present invention is that, in such a commutator motor, an umbrella-like structure is secured to the upper part of the motor frame (3) so as to cover the upper end of the motor (3) and form a double structure. The cover (4) is provided and the outside air suction port (7) is provided by using the cover (4). The outside air suction port (7) is provided with a gap secured between the cover (4) and the motor frame (3). The outside air sucked through this gap cools the inside of the motor and is discharged through the exhaust port (8). The arrow in FIG. 2 shows the flow of the air taken in from the outside air inlet (7). Air cools the interior of the motor over the entire length from the top to the bottom of the motor. In addition, although the description has been made by taking Coirtrill as an example, the present invention is not limited to the application to the core drill.

[0007]

[Effect of device]

 With the structure of the present invention, the commutator motor is protected against intrusion of water from above and has a double structure in which the end of the umbrella-shaped cover covers the outer periphery of the end of the motor frame. Therefore, it is protected against intrusion of water from the side surface. This prevents water from entering the inside of the motor instantaneously and protects the worker from an electric leakage accident.

[Brief description of drawings]

FIG. 1 is a side view of an entire core drill.

FIG. 2 is a sectional view of a commutator motor used in a core drill.

[Explanation of symbols]

 1 Core Rill 2 Commutator Motor 3 Motor Frame 4 Umbrella Cover 5 Intake Fan 6 Rotor 7 Outside Air Suction Port 8 Exhaust Port 9 Bearing 10 Stator 11 Core Bit

Claims (1)

[Scope of utility model registration request] 1. A motor frame (3) has an intake fan (5) inside, and an exhaust port (8) on the lower end side surface.
Umbrella having a rainproof and waterproof structure in the commutator motor (2), which is fixed to the upper part of the motor frame (3) so as to cover the periphery of the upper end of the motor (3) to form a double structure. -Shaped cover (4) and the umbrella-shaped cover (4)
In a motor frame of a commutator motor suitable for use in a core drill, comprising: an outside air suction port (7) provided with a gap secured between the motor frame (3) and the motor frame (3). Rainproof and waterproof structure.