JP2001304167A - Magnetic coupling pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a magnetic coupling pump capable of securing positional precision for detection by directly mounting a detector for detecting a rotating position of an impeller on a printed board. SOLUTION: An end face 20b of an impeller 20 as well as an inner face of an inner cylindrical part 20a of the impeller 20 is magnetized while a detector 21 is directly counted on a printed board 22 in a position opposed to the end face 20b so that the detector 21 is not required to be attached via a long holding part 9a (figure 3) and high positional precision of the detector 21 for detecting a rotating position is assured. By directly mounting on the printed board 22, the detector 21 can be positioned closer to the cooling water passage walls 1e, 1f to assure a thermally stable condition.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic coupling pump which can be used as a water pump or the like used in a cooling system of an automobile or an electric automobile equipped with an internal combustion engine. The present invention relates to a structure capable of improving the positional accuracy of a part.

[0002]

2. Description of the Related Art FIG. 3 is a longitudinal sectional view of a magnetic coupling pump according to the prior art. In FIG. 3, a pump chamber 2a is formed by welding a synthetic resin housing 1 and a synthetic resin pump cover 2 on a joint surface. The pump cover 2 is provided with an inlet 2b for sucking in a fluid and an outlet 2c for discharging the fluid.
a. In the pump chamber 2a, an impeller 3 having a cylindrical portion 3a magnetized in advance is rotatably supported by a fixed shaft 15 so as to cover a cylindrical partition wall 1a provided in the housing 1. Inner diameter of cylindrical portion 3a of impeller 3 and partition wall 1
The outer diameter of a is assembled while maintaining a minimum gap. When the impeller 3 is rotated by the magnetic action, the blade 3b sucks fluid from the inlet 2b and discharges fluid from the outlet 2c.

[0003] A motor chamber 1b is formed by a cylindrical partition wall 1a of the housing 1, and a motor section 4 for rotating the impeller 3 is fixed to the motor chamber 1b. The motor section 4 is formed by stacking a thin plate-shaped magnetic material 5a and
And the coil 6 is wound around the radially protruding portion of the stator 5. The plurality of ribs 1c provided inside the partition wall 1a engage with a not-shown concave portion provided at the tip of the radially protruding portion of the stator 5, and the motor portion 4 is fixed to the housing 1. A first coupling terminal 8 for supplying external power to a printed circuit board 7 described later is integrally formed with a connector portion 1d provided at an upper end portion of the housing 1.

The printed circuit board 7 covers the motor chamber 1b.
Is fixed and coupled to the coil 6 via the terminals 13a and 13b to supply drive power. A detection unit 9 for detecting the rotational position of the impeller 3 on the printed circuit board 7;
The impeller 3 is attached to the coil 6 in accordance with the electric signal from the detection unit 9.
A control unit 10 that supplies driving power for rotating the motor is arranged. The detection unit 9 is fixed and wired to a holding unit 9 a formed integrally with the printed circuit board 7. Also,
At a position corresponding to the first coupling terminal 8 on the printed circuit board 7,
A second coupling terminal 11, which is snap-coupled to the first coupling terminal 8, is integrally fixed. The second coupling terminal 11 is wired to the control unit 10, and an external power supply is introduced. After all of these components are assembled, the fluid resin 14 is poured into the housing 1, and the components are insulated and solidified by so-called potting and covered with the motor cover 12.

[0005]

However, the detection signal for detecting the rotational position of the impeller 3 is configured to pick up the magnetic flux of the magnetized portion 3c magnetized on the inner surface of the cylindrical portion 3a. Therefore, the detection unit 9 is located at a position opposite to the magnetized unit 3c at a position away from the printed circuit board 7 and a long holding unit 9
It is necessary to dispose them via a, and it becomes difficult to secure the positional accuracy for detection due to distortion of the holding unit 9a and the like. Further, since the impeller 3 is supported by the fixed shaft 15 in a cantilever manner, the cylindrical portion 20a swings and the relative gap with the detecting portion 9 is easily changed, so that the positional accuracy for detection is ensured. It becomes difficult. Accordingly, an object of the present invention is to provide a magnetic coupling pump capable of securing position accuracy for detection by directly mounting a detection unit for detecting a rotational position of an impeller on a printed circuit board. .

[0006]

According to a first aspect of the present invention, there is provided an impeller having a magnetized cylindrical portion rotatably supported by a pump chamber and a motor chamber. A motor for rotating the impeller, a detector for detecting a rotational position of the impeller, and a drive power for rotating the impeller in response to a signal from the detector. And a printed circuit board having a control unit, wherein the magnetization applied to the inner surface of the cylindrical portion of the impeller is also applied to the front end surface, and the detection unit is opposed to the front end surface. It is directly mounted on the printed circuit board.

[0007]

As described above, according to the first aspect of the present invention, the magnetizing applied to the inner surface of the cylindrical portion of the impeller is also applied to the leading end surface, and the detecting section is directly opposed to the leading end surface. , It is not necessary to attach via a long holding unit, and the position accuracy of the detecting unit for detecting the rotational position can be kept high. In particular, even if the cylindrical portion of the impeller that is supported on the fixed shaft in a cantilever manner swings, the relative gap with the detection unit does not change, so that the positional accuracy can be kept high. Also, by mounting directly on the printed circuit board, it can be close to the cooling water passage wall,
A thermally stable state can be maintained.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a longitudinal sectional view of a magnetic coupling pump according to one embodiment of the present invention. FIG. 2 is a three-dimensional view of the impeller. In FIG. 1, in addition to the conventional magnetized portion 3c provided on the inner surface of the cylindrical portion 20a, a tip surface 20c is provided.
An impeller 20 having a magnetized portion 20c in which the same magnetic pole is magnetized is also attached to b. The detection unit 21 is directly surface-mounted on the printed circuit board 22 corresponding to the front end surface 20b on which the magnetized unit 20c is applied, without passing through the holding unit 9a (see FIG. 3).

At the lower end of the housing 1, a passage (not shown) for flowing cooling water is secured.
The motor chamber 1b and the pump chamber 2a are isolated by e and 1f. Therefore, the detection unit 21 is
2, the cooling water passage walls 1e, 1
Since f approaches f, it is easily cooled, and a thermally stable state can be maintained. Next, the magnetized portion 20c provided on the tip end surface 20b of the impeller 20 will be described. In FIG. 2, a magnetized portion 20c having the same magnetic pole as the magnetic pole of the magnetized portion 3c provided on the inner surface is magnetized on the front end surface 20b at the same time as the inner surface is magnetized. Since the configuration other than the above is the same as that of the conventional technology, the same reference numerals are given and the description is omitted.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a magnetic coupling pump according to one embodiment of the present invention.

FIG. 2 is a three-dimensional view of an impeller of the magnetic coupling pump according to one embodiment of the present invention. .

FIG. 3 is a longitudinal sectional view of a conventional magnetic coupling pump.

[Explanation of symbols]

 1b Motor room 2a Pump room 3c Magnetizing unit 4 Motor unit 10 Control unit 20 Impeller 20a Cylindrical unit 20b Tip surface 20c Magnetizing unit 21 Detecting unit 22 Printed circuit board

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) // H02K 1/27 502 H02K 1/27 502A 5H622 5/128 5/128 F-term (Reference) 3H022 AA01 BA02 BA07 CA09 CA13 CA17 CA50 DA09 5H019 AA00 BB01 BB05 BB15 BB19 BB22 CC04 CC09 DD01 EE01 EE09 EE14 FF00 FF01 GG00 5H605 AA00 BB05 BB10 BB19 CC01 CC06 DD37 EC05 FF06 5H607 AA05 0501 BB07 BB07 BB07 BB07 BB07 BB07 BB07 BB07 BB07 BB07 BB07 BB09 JK07 JK13 JK14 5H622 CA01 CA10 QA10 QB01

Claims (1)

[Claims] An impeller having a cylindrical portion rotatably supported by a pump chamber and having a magnetized portion; a motor portion disposed in a motor chamber for rotating the impeller; and a rotation position of the impeller. A magnetic coupling pump comprising: a detection unit to detect; and a printed circuit board having a control unit that supplies drive power to the motor unit to rotate the impeller in response to a signal from the detection unit. A magnetic coupling pump, wherein the magnetizing applied to the inner surface of the cylindrical portion is also applied to the front end surface, and the detecting section is directly mounted on the printed circuit board facing the front end surface.