JP2000240593A - DC brushless motor pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent water from being accumulated in a case having an electronic circuit board for controlling rotation of a DC brushless motor and having a relatively simple structure, which breaks an electronic circuit and malfunctions, and a component. It is an object of the present invention to provide a DC brushless motor pump capable of reducing the number of points. SOLUTION: A DC brushless motor is used as a driving source,
An electronic circuit board 7 for controlling the rotation of the DC brushless motor and a case 6 incorporating the electronic circuit board 7 are provided, and the case 6 is arranged so that the opening thereof faces downward in a state where the pump is installed. The configuration is a DC brushless motor pump.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a DC brushless motor pump having a DC brushless motor as a drive source and an electronic circuit board for controlling its rotation.

[0002]

2. Description of the Related Art In recent years, a pump using a DC brushless motor as a drive source has set a bubble jet strength in a bubble bath apparatus according to a bather's preference by changing the rotation speed of the DC brushless motor. And it is often used for miniaturization of the bubble bath apparatus.

The DC brushless motor pump has a D
An electronic circuit is required to control the rotation of the C brushless motor. When this electronic circuit uses a signal cable or the like and is connected to a position away from the DC brushless motor, noise (noise) affects the electronic circuit. To cause a malfunction, it is necessary to provide a substrate constituting the electronic circuit near the pump body.

Hereinafter, a configuration of a conventional DC brushless motor pump will be described with reference to FIG.

As shown in FIG. 2, this DC brushless motor pump includes a DC brushless motor (not shown), a motor unit including a motor frame 1 having the DC brushless motor built therein, and a hot water pump. The pump unit comprises a pump casing cover 2 having a suction pipe 3 and a discharge pipe 4 for discharging hot and cold water, and a pump casing 5 including a magnet impeller (not shown) for sucking and discharging hot and cold water. Then, the electronic circuit board 7 for controlling the rotation of the DC brushless motor is housed in the case 6, and the case 6 and the electronic circuit board 7 are fixed to a part of the outside of the motor frame 1 with mounting screws 8. The inside is sealed with a lid 10 with a rubber packing 9 interposed, and the lid 10 is configured to be mounted with mounting screws 11. That.

[0006]

The DC brushless motor pump is often used in places with high humidity. Therefore, in order to prevent moisture in the electronic circuit board 7 for controlling the rotation of the DC brushless motor,
The case 6 containing the electronic circuit board 7 requires a rubber packing 9 and a lid 10 for sealing the inside of the case 6.

[0007] For this reason, there are problems such as an increase in the number of parts and troublesome mounting, and it is necessary to reduce the number of parts in view of environmental problems. On the other hand, when the rubber packing 9 and the lid 10 are not provided, water accumulates in the case 6 and immerses the electronic circuit board 7 to break the electronic circuit, resulting in malfunction. In the actual operation, when the temperature inside the case 6 rises due to the heat generated by the electronic circuit board 7 and the temperature of the outside air falls below the temperature inside the case 6, dew condensation occurs inside the case 6. Then, there is a problem that the water droplets generated by the dew condensation accumulate in the case 6, immerse the electronic circuit board 7, and destroy the electronic circuit to cause malfunction.

The present invention solves the above-mentioned conventional problems and has a relatively simple structure, in which water accumulates in a case in which an electronic circuit board for controlling the rotation of a DC brushless motor is built, destroying the electronic circuit and causing malfunction. It is an object of the present invention to provide a DC brushless motor pump capable of preventing such a problem and reducing the number of parts.

[0009]

To achieve the above object, the present invention provides a DC brushless motor pump having a case containing an electronic circuit board for controlling the rotation of a DC brushless motor. In this state, the case is arranged so that the opening thereof faces downward.

According to the present invention, it is possible to prevent water from accumulating in the case in which the electronic circuit board for controlling the rotation of the DC brushless motor is built-in and to break the electronic circuit to cause malfunction, and to reduce the number of parts. A DC brushless motor pump can be provided.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The invention according to claim 1 of the present invention is directed to a pump casing cover having a DC brushless motor and a motor frame including a motor frame containing the DC brushless motor, and a suction pipe and a discharge pipe. And a DC brushless motor pump comprising a pump unit including a pump casing having an impeller built therein, wherein an electronic circuit board for controlling rotation of the DC brushless motor is built in, and an opening thereof is in a pump installation state. This is a DC brushless motor pump characterized in that it is disposed so as to face downward, and that water accumulates in a case containing an electronic circuit board that controls the rotation of the DC brushless motor and breaks down the electronic circuit, resulting in malfunction. This has the effect of preventing the number of parts and reducing the number of parts.

According to a second aspect of the present invention, in the DC brushless motor pump according to the first aspect, the electronic circuit board is configured to have a moisture-proof structure by performing potting or the like. Has the effect of improving the moisture-proof performance of the device and more reliably preventing the electronic circuit from being broken and malfunctioning.

According to a third aspect of the present invention, in the DC brushless motor pump according to the first aspect, the case containing the electronic circuit board is disposed on a motor frame above the pump section in a state where the pump is installed. This prevents water from directly splashing on the electronic circuit board even when water is splashed on the pump, and further has the effect of making the DC brushless motor and the case compact.

According to a fourth aspect of the present invention, in the DC brushless motor pump according to the first or third aspect, the case containing the electronic circuit board is formed of a material having good heat conductivity to provide a heat dissipation function. This has the effect of effectively suppressing the temperature rise of the electronic circuit board and the DC brushless motor and promoting heat radiation.

An embodiment of the present invention will be described below in detail with reference to the drawings.

(Embodiment 1) FIG. 1 is a cross-sectional side view of a DC brushless motor pump according to Embodiment 1 of the present invention. In FIG. 1, members corresponding to those of the DC brushless motor pump described in the related art are denoted by the same reference numerals as those in the related art.

In FIG. 1, 1 is a motor frame containing a DC brushless motor, 2 is a pump casing cover having a suction pipe 3 for sucking hot water and a discharge pipe 4 for discharging hot water, and 5 is a suction and discharge of hot water. Pump casing having a built-in magnet impeller for performing the operation, and these are configured in the same manner as the above-mentioned conventional technology.

The feature of the first embodiment resides in the arrangement of a case 6 in which an electronic circuit board 7 for controlling the rotation of a DC brushless motor is provided.
The opening is arranged so that it faces downward when the pump is installed.

The case 6 may be installed on the motor frame 1 and fixed to the motor frame 1 with mounting screws 8, in which case a more compact configuration is possible.

Further, the electronic circuit board 7 for controlling the rotation of the DC brushless motor may have a moisture-proof structure by taking measures against moisture-proof such as potting on its surface.

In the DC brushless motor pump configured as described above, water does not accumulate in the case 6 but is discharged out of the case 6. Therefore, it becomes possible to immerse the electronic circuit board 7 to break the circuit and prevent malfunction. In addition, problems such as an increase in the number of parts and labor for mounting can be solved, and the number of parts can be reduced from the viewpoint of environmental problems.
Further, during actual operation, when the temperature in the case 6 increases due to heat generated by the electronic circuit board 7 and the temperature of the outside air becomes lower than the temperature in the case 6, water droplets are generated in the case 6 due to condensation. However, since the opening of the case 6 is directed downward, water does not accumulate in the case 6 and is discharged out of the case 6, so that the electronic circuit board 7 is flooded, and the circuit is broken, resulting in malfunction. Can be prevented.

Further, by disposing the case 6 on the motor frame 1 above the pump in a state where the pump is installed, it is possible to prevent water from directly splashing on the electronic circuit board 7 even when the pump is sprayed with water.

The case 6 is made of a material having good heat conductivity (for example, aluminum) and has a heat radiation function, thereby effectively suppressing the temperature rise of the electronic circuit board and the DC brushless motor and promoting heat radiation. It is also possible.

[0024]

As is apparent from the above description, according to the present invention, water is discharged out of the case without water remaining in the case in which the electronic circuit board for controlling the rotation of the DC brushless motor is built. Can be prevented, the heat radiation effect can be improved, and a highly reliable DC brushless motor pump with a simple configuration and a small number of parts can be provided.

[Brief description of the drawings]

FIG. 1 is a cross-sectional side view of a DC brushless motor pump according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional side view of a conventional DC brushless motor pump.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor frame 2 Pump casing cover 3 Suction pipe 4 Discharge pipe 5 Pump casing 6 Case 7 Electronic circuit board 8 Mounting screw

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Minoru Kashiwara 1006 Kazuma Kadoma, Osaka Prefecture F-term in Matsushita Electric Industrial Co., Ltd. 3H022 AA01 BA01 DA05 DA09 DA12 DA20 3H034 AA01 AA11 BB01 CC03 DD02 DD12 EE04 EE12 EE15

Claims (4)

[Claims] 1. A motor comprising a DC brushless motor and a motor frame including the DC brushless motor, a pump casing including a suction pipe and a discharge pipe, and a pump section including a pump casing including an impeller. DC brushless motor pump, characterized in that a case incorporating an electronic circuit board for controlling rotation of the DC brushless motor is disposed so that an opening thereof faces downward when the pump is installed. DC brushless motor pump. 2. The DC brushless motor pump according to claim 1, wherein the electronic circuit board is formed in a moisture-proof structure by performing potting or the like. 3. The DC brushless motor pump according to claim 1, wherein the case containing the electronic circuit board is disposed on a motor frame above the pump unit in a state where the pump is installed. 4. The DC brushless motor pump according to claim 1, wherein the case containing the electronic circuit board is formed of a material having good heat conductivity and has a heat radiation function.