JP3112216B2 - Canned motor pump - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a canned motor pump, and more particularly to a canned motor pump suitable for a hot water circulation pump and the like.

[0002]

2. Description of the Related Art The contents and structure of the prior art will be described with reference to FIGS. FIG. 4 is a cross-sectional view showing an example of the structure of a conventional canned motor pump. As is well known, in the canned motor pump, a space surrounded by the motor casing 1 and the cup-shaped partition wall 2 forms a stator chamber 4 in which a stator 10 of a drive motor is disposed. A space surrounded by the cup-shaped partition wall 2 and the pump casing 3 on the opposite side, which is separated from the stator chamber 4 and the cup-shaped partition wall 2, is a rotor chamber 5 and a pump chamber 6 connected thereto. The rotor 20 and the impeller 30 integrated therewith are arranged.
Since the pump chamber 6 has an airtight structure except for the fluid inlet / outlet 3-2, a sealing member such as an O-ring 7 is used in combination at the contact surface between the cup-shaped partition wall 2 and the pump casing 3 as illustrated. . The rotor 20 and the impeller 30 integral therewith are connected to the center of the bottom surface 2-1 of the cup-shaped partition wall through the bearing 9 mounted on the inner peripheral surface of the cylindrical boss portion 31 integrating the two. The shaft 3 is rotatably supported by a shaft 8 held by a foot 3-1 formed on the shaft 3.

[0003] An electronic circuit 16 for controlling the energization of the drive motor is provided inside the motor casing 1. The electronic circuit 16 and the stator 10 of the drive motor are electrically connected, and a magnetic detection for detecting a magnetic pole position of a permanent magnet 21 which is a main component of a rotor which is one of the connection means. In order to transmit the signal of the element 14, the magnetic detection element 14 is mounted as shown in FIGS. 5 and 6 using a flexible printed wiring board 15 or the like. As shown in the figure, the magnetic detecting element 14 is fixed close to the inner peripheral end of the stator core 11, but conventionally, this arrangement is fixed by positioning a jig or the like inside the stator winding end. It was usual to use an adhesive while fixing.

[0004]

In the conventional configuration as described above, the means for determining the predetermined relative positional relationship between the magnetic detecting element 14 and the stator winding 13 is an indirect means such as a jig.
There is a problem that the preparation of the jig and the handling thereof, the curing of the adhesive involves wasted time, and the variability of products and the disadvantage in cost are inevitable.

[0005]

Means for Solving the Problems A canned motor pump according to the present invention comprises a stator insulating member 12 for insulating a stator core 11 and a stator winding 13 from a stator inner peripheral surface side.
Attach the magnetic sensing element 14 that extends in the axial direction from the end.
The fitting portion 12-1 for fitting the holding member 15 is
At least at both ends in the circumferential direction of the fitting portion 12-1.
2 is formed, or a center direction is formed in the fitting portion 12-1.
Is formed, and has the flexibility as exemplified.
The small protrusion is attached to the holding member 15 made of a printed wiring board
A fitting small hole 15-1 corresponding to 12-3 is formed.
The magnetic detection element 14 is configured to be positioned by fitting a person .

[0006]

In the configuration as described above, the means for determining the relative positional relationship between the magnetic sensing element 14 and the stator winding 13 does not require any indirect means such as a jig , and also uses an adhesive or the like.
Unnecessary stator insulation member 1 integral with stator winding 13
2 and a holding member 15 for integrally holding the magnetic detection element 14, so that a simple and highly reliable holding and fixing of the magnetic detection element 14 can be achieved. There is.

An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of a main part of an example of a holding member for holding the magnetic detection element 14 according to the present invention.
A flexible printed wiring board 15 is used,
A small hole 1 for inserting and holding a predetermined magnetic detection element 14 at the tip
4 and the magnetic detection element 14 is inserted and held in the small hole 14.
It is configured to: The magnetic detecting element 14 is
It is the same as the prior art example in that it is held in position.
Near the small hole 14 holding the magnetic detection element 14,
Fitting small hole 1 for connection and fixing with stator insulating member 12
5-1 is formed. The small hole 15-1 is shown in FIG.
Fitting part 12-1 on the stator inner peripheral side of the stator insulating member 12
Is fitted to the small projection 12-3. And before
The tip of the holding member 15 fixes the stator insulating member 12.
Symmetrically arranged near the inner peripheral surface of the child, extending in the axial direction
Wall 12-2 so that the pair of walls 12-
2, the relative position between the holding member 15 and thus the magnetic detection element 14 and the stator winding 13 wound around the stator core 11 is adjusted. Will be secured.

[0008] in which FIG. 3 shows a mounted state thereof, the magnetic
The holding member 15 for inserting and holding the detection element 14 is fixed as described above.
Contact between the wall 12-2 of the child insulating member 12 and the fitting portion therebetween
Fitting, and facing the center direction formed in the fitting portion 12-1.
The small projection 12-3 and the magnetic detecting element
The positioning is ensured by the fitting with the small hole 15-1 formed near the small hole 14 for inserting the child with the small hole 15-1 formed in the vicinity thereof .

[0009]

Since the canned motor pump according to the present invention is configured as described above, the correlation position between the magnetic detection element 14 and the stator winding 13 is integrated with the stator winding 13. a stator insulation member 12, so by direct engagement between the holding member 15 for holding the magnetic sensing element 14, ensures a Thus also concise, action effects held fixed reliable magnetic detecting element 14 can be realized is there.

[Brief description of the drawings]

FIG. 1 is a schematic view of a main part of a holding member for holding a magnetic detection element according to the present invention.

FIG. 2 is a perspective view showing a holding member fitting portion shown in FIG. 1 of the stator according to the present invention.

FIG. 3 is a partial perspective view showing a fitted state of both of the examples of the present invention shown in FIGS. 1 and 2;

FIG. 4 is a cross-sectional view showing an example of a conventionally implemented canned motor pump.

FIG. 5 is a schematic view of a main part of a holding member for holding a magnetic sensing element according to the related art.

FIG. 6 is a perspective view showing a fitting portion of a holding member shown in FIG. 5 of a stator according to the related art.

FIG. 7 is a partial perspective view showing a fitted state of both of the examples of the prior art shown in FIGS. 5 and 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motor casing 2 Cup-shaped partition 2-1 Bottom surface 3 Pump casing 3-1 Feet 3-2 Hot water inlet / outlet 4 Stator room 5 Rotor room 6 Pump room 7 O-ring 8 Shaft 9 Bearing 10 Stator 11 Stator core 12 Stator insulating member 12-1 Fitting for fitting the holding member of the magnetic sensing element
Part 12-2 Wall Forming Fitting Part 12-3 WallMating part betweenSmall protrusions formed on the stator 13 Stator winding 14 Magnetic sensing element(= Small hole for element insertion)  15 Hold the magnetic sensing elementHolding member (= flexible
Printed wiring board with  15-1 Small Hole 16 Electronic Circuit for Control 20 Rotor 21 Permanent Magnet 22 Rotor Yoke 23 Rotor Cover 30 Impeller 31 Boss

Claims (4)

(57) [Claims] 1. A stator 10 comprising a stator core 11 and a stator winding 13 wound on the stator core 11, and a rotor integrally formed with an impeller 30 with a permanent magnet 21 as a main member. 20 and a brushless DC motor having a magnetic detecting element 14 for detecting a magnetic pole position of the rotor 20, and a partition wall 2 for isolating the stator 10 and the rotor 20 integrated with the impeller 30. in canned motor pump comprising, together with a stator insulation member 12 for insulating the stator winding 13 and the stator iron core 11, the magnetic detection element 14
A holding member 15 for holding the stator insulating member 1
2 has a fitting portion extending in the axial direction from the inner peripheral end of the stator.
12-1 is formed, and the fitting portion 12-1 is formed in the axial direction.
Extending walls 12-2 are provided at least at both ends in the circumferential direction.
Then, the holding member 15 abuts and fits on the fitting portion 12-1.
The canned motor pump is characterized in that the magnetic detection element 14 is positioned by being worn . 2. A fitting portion 1 between the pair of walls 12-2.
2-1, small projections 12-3 facing the center of the stator are formed , and the stator insulating member of the holding member 15 is formed.
Fitting on the fitting surface with the small projections 12-3
The canned motor pump according to claim 1, wherein a small hole (15-1) is formed. 3. A holding member 15 for holding the magnetic sensing element 14, forms a T letter-shaped, the magnetic detection element on its head
3. The canned motor pump according to claim 1 , wherein a small hole for element insertion for inserting and holding a child and the small hole for fitting 15-1 are provided. 4. 4. A holding member for holding said magnetic sensing element, canned motor pump according to any one of claims 1 to 3, it is printed wiring board, characterized flexible.