JP2000297744A - Electric pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide high intake/exhaust performance by protruding both the right and left end sections of the motor shaft of a DC brushless motor from a motor casing, and assembling pump bodies to both the right and left end sections. SOLUTION: Both the right and left end sides of a motor shaft 4 are protruded from a motor casing 1 as output shafts respectively. Pump bodies B1, B2 having two heads are assembled to both the right and left end sections 4a, 4b of the motor shaft 4 protruded from the motor casing 1 of a DC brushless motor as output shafts. Each of the pump bodies B1, B2 is constituted of a diaphragm 12 and a valve seat 14 having a valve 13. When the DC brushless motor is driven, the diaphragm 12 is operated via a connecting rod 17 by the rotation of an eccentric shaft 4 fitted to the motor shaft 4, and air can be fed to a required place through the valve 13, an intake/exhaust passage, a connecting port 22 and an intake/exhaust hose, for example.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric pump operated by a DC brushless motor, and more particularly, to a vacuum pump used for depressurizing the inside of a container (chamber) such as a vacuum chamber, and a required place. TECHNICAL FIELD The present invention relates to an electric pump suitable for mainly supplying and discharging gas, such as an air pump used for supplying air or the like to a vehicle.

[0002]

2. Description of the Related Art When a DC brushless motor is used as a driving source of an electric pump, a motor driving circuit for controlling the driving of the motor is provided. Therefore, the more complicated the rotation control is, the more complicated the motor driving circuit becomes. Therefore, there is a problem in that the number of electronic components constituting the circuit increases and the size of the circuit increases. Therefore, in this type of conventional electric pump, the motor drive circuit (substrate) is provided outside the motor casing. Accordingly, there is a problem that the entire pump is inevitably increased in size because the motor drive circuit board is externally provided outside the motor casing.

[0003]

SUMMARY OF THE INVENTION The present invention has been made in view of such a conventional problem, and effectively uses not only one side of a motor shaft (output shaft) of a DC brushless motor but also both left and right sides as output shafts. By using it, it is possible to obtain high air supply / exhaust performance, and it is possible to suppress an increase in the size of the entire pump by incorporating a motor drive circuit board having electronic components for controlling the drive of the motor inside the motor casing. It is intended to provide a possible electric pump.

[0004]

According to a first aspect of the present invention, there is provided an electric pump operated by a DC brushless motor, wherein the motor pump includes a motor shaft of the DC brushless motor. Are respectively projected from the motor casing as output shafts, and the pump body is attached to each of the left and right ends of the motor shaft projected from the motor casing. According to a second aspect of the present invention, in the electric pump, the motor shaft of the DC brushless motor is penetrated through a motor drive circuit board provided with electronic components for controlling the driving of the motor, and the motor drive circuit board is connected to the motor shaft. The motor drive circuit board is built in the motor casing by arranging the motor drive circuit board at right angles to the axial direction. In addition, the above-mentioned "disposing the motor drive circuit board so as to be orthogonal to the axial direction of the motor shaft" does not mean that the motor drive circuit board is orthogonal to the axial direction of the motor shaft in a strict sense. Should be understood.

[0005]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the drawings. However, the present invention is not limited to the illustrated embodiment, and various variations are considered. Can be Incidentally, the pump type to which the present invention can be applied includes a diaphragm type pump and a piston type pump. In the illustrated embodiment, a diaphragm type pump having two heads arranged in two at the top and bottom in the drawing is provided. Here is an example.

The DC brushless motor A includes a motor casing 1, a rotor 2 and a stator 3 installed inside the motor casing 1, and left and right ends 4 a and 4 b of the motor casing 1 which are linked to the rotor 2. And a motor drive circuit board 5 and the like.

The motor casing 1 is composed of a cup-shaped casing 1a formed in a substantially cup shape by, for example, die casting, and a lid-shaped casing 1b for closing one opening of the cup-shaped casing 1a. Specifically, a rotor 2 and a stator 3 and a motor shaft 4 linked to the rotor 2 are provided inside the cup-shaped casing 1a.
And electronic components 5 for controlling the driving of the motor
A motor drive circuit board 5 provided with a is provided, and the lid-like casing 1b is detachably attached to the cup-like casing 1a with screws 6.

The rotor 2 is an outer rotor also serving as a yoke, and is formed in a substantially cup shape slightly smaller in diameter than the inner periphery of a cup-shaped casing 1a constituting the motor casing 1, and its rotation center is A rotating shaft 7 formed in a substantially cylindrical shape is integrally attached to the portion, and a permanent magnet 8 formed in a ring shape is integrally installed on the inner peripheral surface. The stator 3 is integrally fixed to the outer periphery of the
Are made to face each other.

The stator 3 is formed by winding a coil 3b around an iron core 3a in an annular shape, and is integrally fixed to a lid-like casing 1b constituting the motor casing 1. Further, the motor shaft 4 is integrally fixed to and cooperated with the rotating shaft 7 of the rotor 2 so as to rotate in the same body as the rotor 2, and both left and right ends thereof are cup-shaped casings constituting the motor casing 1. 1a and ball bearings 9a, 9b provided on the lid-like casing 1b, respectively, are rotatably supported, and the left and right ends 4a, 4b are used as output shafts, respectively.
Protrude from.

The motor drive circuit board 5 is provided with an electronic component 5a for controlling the driving of the motor on an insulating board 5b formed in a shape substantially compatible with the inner shape of the motor casing 1, and at the center thereof. A through hole 5c for penetrating the motor shaft 4 is formed, and the motor drive circuit board 5 is disposed so as to be orthogonal to the axial direction of the motor shaft 4 by penetrating the motor shaft 4 through the through hole 5c. Then, the motor drive circuit board 5 is built in the motor casing 1 by being arranged in parallel with one opening of the cup-shaped casing 1a. Reference numeral 10a in the figure denotes a Hall element for detecting the position of the magnetic pole of the ring-shaped permanent magnet 8, and 10b denotes a cord connected to an external power supply.

[0011] Pump bodies B1 and B2 having, for example, two heads are respectively assembled on the left and right ends 4a and 4b of the motor shaft 4 protruding from the motor casing 1 of the DC brushless motor A as output shafts. wear.

The pump bodies B1 and B2 are provided with a housing 11 and a diaphragm 12 incorporated therein as in the prior art.
And a valve seat 14 having a valve 13 and the like.
The pump head member 16 is attached to a portion to be the head portion 15. Reference numerals 17a and 17b in the figure denote connecting rods for connecting the diaphragm 12 and an eccentric shaft 4 'attached to the motor shaft 4. The diaphragm 12 is provided with a retainer at the tip of the connecting rods 17a and 17b. 1
Screwed through 7 '.

The valve seat 14 is provided inside the housing 11, specifically, inside the head portion 15 of the pump bodies B1, B2.
The air chamber 18 is formed in cooperation with the diaphragm 12, and a rubber valve 13 formed in a thin sheet shape is provided on a surface opposite to the diaphragm 12. A vent 19 communicating with the air chamber 18 is formed at a position corresponding to the valve 13. Then, the pump head member 16 is overlapped on the head portion 15 so as to cover the upper surface of the valve seat 14, and
Fasten and attach with a fastening screw or fastening clip 20 or the like.

The pump head member 16 is formed in a substantially rectangular plate shape having a size compatible with the head portion 15, and has a supply / exhaust passage 21 communicating therewith with the valve 13. A connection port 22 for connecting a hose (not shown) is protruded, and this connection port 22 communicates with the supply / exhaust passage 21.

Thus, when the DC brushless motor A is driven, the eccentric shaft 4 ′ attached to the motor shaft 4 is driven.
The diaphragm 12 is operated via the connecting rod 17 by the rotation of, and the inside of a container (chamber) such as a vacuum chamber is depressurized or required through the valve 13 → the supply / exhaust passage 21 → the connection port 22 → the supply / exhaust hose. Air or the like is supplied to the place.

[0016]

As described above, the electric pump according to the present invention has the left and right ends of the motor shaft of the DC brushless motor protruding from the motor casing as output shafts, respectively, and has the left and right ends of the motor shaft protruding from the motor casing. Since the pump body is assembled to each
Not only one side but also the left and right sides of the motor shaft (output shaft) of the DC brushless motor can be effectively used as output shafts, so that high air supply / exhaust performance can be obtained even with a small size.

Further, according to the electric pump of the present invention, the motor shaft of the DC brushless motor is penetrated through the motor drive circuit board provided with electronic parts for controlling the drive of the motor, and the motor drive circuit board is provided. Is disposed so as to be orthogonal to the axial direction of the motor shaft, so that the motor drive circuit board is built in the motor casing. Therefore, the motor drive circuit board for controlling driving of the motor is provided inside the motor casing. The pump can be easily built in. As a result, the whole pump including the motor drive circuit board can be formed compactly, and the size of the entire pump can be suppressed.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view showing an embodiment of the present invention.

FIG. 2 is a sectional view showing one embodiment of a pump body.

FIG. 3 is a front view showing one embodiment of a motor drive circuit board.

[Explanation of symbols]

A: DC brushless motor 1: Motor casing 2: Rotor 3: Stator 4: Motor shaft 5: Motor drive circuit board B1, B2: Pump body

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Akira Sato 5-8-6 Nishi-Aoki, Kawaguchi-shi, Saitama FRC in FRC (reference) 3H075 AA18 BB04 BB20 CC34 DB03 3H076 AA14 AA21 AA39 BB38 CC07

Claims (2)

[Claims] 1. An electric pump operated by a DC brushless motor, wherein left and right ends of a motor shaft of the DC brushless motor are respectively protruded from a motor casing as output shafts, and left and right of the motor shaft protruded from the motor casing. An electric pump characterized in that a pump body is attached to each end. 2. A motor shaft of the DC brushless motor is penetrated through a motor drive circuit board provided with electronic components for controlling the driving of the motor, and the motor drive circuit board is disposed so as to be orthogonal to the axial direction of the motor shaft. The electric pump according to claim 1, wherein the motor drive circuit board is built in the motor casing by providing the motor drive circuit board.