JPH06253491A - Canned motor pump - Google Patents

Abstract

PURPOSE:To obtain a canned motor pump having a structure to which a magnetic detector is easily attached. CONSTITUTION:In canned motor pump, a magnetic detecting element is positioned by forming a plurality of engaging parts 12-1 in a stator insulating member 12 for winding coils 13 on a stator iron core 11, so as to stretch in the axial direction from the end of its inner peripheral surface, and fitting holding members for holding the magnetic detecting element to the engaging parts of the above-mentioned insulating member 12.

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 circulating 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 a structural example 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 the stator 10 of the drive motor is arranged. The space surrounded by the cup-shaped partition wall 2 and the pump casing 3 on the opposite side, which is separated by the stator chamber 4 and the cup-shaped partition wall 2, is the rotor chamber 5 and the pump chamber 6 connected to the rotor chamber 5. The rotor 20 and the impeller 30 integral with the rotor 20 are arranged.
Since the pump chamber 6 has an airtight structure except for the fluid inlet / outlet port 3-2, a seal member such as an O-ring 7 is also used on the contact surface between the cup-shaped partition wall 2 and the pump casing 3 as illustrated. . The rotor 20 and the impeller 30 integrated with the rotor 20 are connected to the center of the bottom surface 2-1 of the cup-shaped partition wall and the pump casing via the bearing 9 mounted on the inner peripheral surface of the cylindrical boss portion 31 that integrates the two. It is rotatably supported by a shaft 8 held by a foot 3-1 formed on the shaft 3.

Inside the motor casing 1, an electronic circuit 16 for controlling the energization of the drive motor is provided. The electronic circuit 16 and the stator 10 of the drive motor are electrically connected to each other, but the magnetic detection for detecting the magnetic pole position of the permanent magnet 21 which is the main body of the rotor, which is one of the connecting means. In order to transmit the signal of the element 14, the magnetic detection element 14 is mounted using a flexible printed wiring board 15 or the like as shown in FIGS. As shown in the figure, the magnetic detection element 14 is fixed close to the end of the inner peripheral surface of the stator iron core 11. Conventionally, this arrangement and fixing is performed by positioning it inside the end of the stator winding with a jig or the like. However, it was usual to fix it using an adhesive.

[0004]

In the conventional structure as described above, the means for determining the predetermined relative positional relationship between the magnetic detection element 14 and the stator winding 13 is an indirect means such as a jig.
There was a problem that product variations and cost disadvantages could not be avoided, such as the preparation and handling of jigs, and the curing of the adhesive wasted time.

[0005]

In a canned motor pump according to the present invention, a stator insulating member 12 for insulating a stator iron core 11 and a stator winding 13 is axially extended from its inner peripheral surface end. A plurality of fitting portions 12-1 are formed, and the printed wiring board 1 is flexible and holds the magnetic detection element 14.
A holding member made of 5 is formed in the stator insulating member 12, and a recess for inserting the holding member holding the wall 12-2 and the magnetic detection element 14 extending axially from the end of the inner peripheral surface thereof, and / Alternatively, a small projection 12-3 directed toward the center is formed on the wall 12-2, and the holding member 15 for holding the magnetic detection element 14 is provided with a fitting small hole 15-1 corresponding to the small projection 12-3. Is formed, and the magnetic detection element 14 is positioned so as to be fitted into the fitting portion 12-1.

[0006]

[Operation] In the above-mentioned configuration, the means for determining the predetermined relative positional relationship between the magnetic detection element 14 and the stator winding 13 is based on the combined use of an indirect means such as a jig and an adhesive. Instead, the configuration is based on the direct fitting of the stator insulating member and the holding member of the magnetic detection element 14, so that the magnetic detection element 14 can be simply and highly reliably held and fixed.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view of an essential part of an example of a holding member of a magnetic detection element 14 according to the present invention. The point that the magnetic detection element 14 is fixed to the tip of a flexible printed wiring board 15 is different from the above-mentioned conventional technique. However, a small hole 15-1 is formed in the vicinity of the magnetic detection element 14, and the small hole 15-1 is formed on the inner peripheral surface of the stator insulating member 12 shown in FIG.
A wall 1 that is fitted to the housing 3 and has the tip of the holding member extending in the axial direction in the vicinity of the inner periphery of the stator insulating member 12 as well.
The holding member 15 is inserted into the recess formed by 2-2.
Therefore, the relative position between the magnetic detection element 14 and the stator winding 13 wound around the stator iron core 11 is secured.

FIG. 3 shows the mounting state, in which the holding member 15 is circumferentially and radially directed to the stator insulating member 12.
Of the wall 12-2 of the wall 12-2 and the axial direction of the small projection 12-3 formed on the inner peripheral surface of the wall 12-2 and directed toward the center and the holding member 15.
The small holes 15-1 are fitted and fitted together to be held and positioned.

[0009]

Since the canned motor pump according to the present invention has the above-described structure, the predetermined relative positional relationship between the magnetic detection element 14 and the stator winding 13 is determined by the stator insulating member 12 and the magnetic field. Holding member 15 for holding the detection element 14
There is an effect that the magnetic detection element 14 can be reliably and simply held and fixed with high reliability due to the direct fitting.

[Brief description of drawings]

FIG. 1 is a schematic view of a main part of a holding member that holds 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 conventional canned motor pump.

FIG. 5 is a schematic view of a main part of a holding member that holds a magnetic detection 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 a conventional technique.

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

[Explanation of symbols]

1 Motor casing 2 Cup-shaped partition wall 2-1 Bottom surface 3 Pump casing 3-1 Leg 3-2 Hot water inlet / outlet 4 Stator chamber 5 Rotor chamber 6 Pump chamber 7 O-ring 8 Shaft 9 Bearing 10 Stator 11 Stator iron core 12 Stator Insulation Member 12-1 Fitting Part for Fitting Holding Member of Magnetic Detecting Element 12-2 Wall Forming Fitting Part 12-3 Small Protrusion Formed on Wall 13 Stator Winding 14 Magnetic Detecting element 15 Flexible printed wiring board holding a magnetic detecting element 15-1 Small hole 16 Electronic circuit for control 20 Rotor 21 Permanent magnet 22 Rotor yoke 23 Rotor cover 30 Impeller 31 Boss part

Claims (5)

[Claims] 1. A rotor comprising a stator iron core and a stator winding wound around the stator iron core, a rotor mainly composed of a permanent magnet and an impeller, and a magnetic pole position of the rotor. In a canned motor pump provided with a partition wall for separating a brushless DC motor including a magnetic detection element for detecting, and a rotor integrated with the stator and the impeller,
A plurality of fitting portions extending in the axial direction from the inner peripheral surface end portion of the stator insulating member that insulates the stator iron core and the stator winding from each other is formed, and a holding member that holds the magnetic detection element is provided. A canned motor pump characterized in that the magnetism detection element is positioned by being fitted into a fitting portion of the insulating member. 2. The fitting portion formed on the insulating member is provided with a wall extending axially from an end portion of an inner peripheral surface of the insulating member and a recess into which the holding member holding the magnetic detection element is inserted. The canned motor pump according to claim 1. 3. A holding member for holding a magnetic detector, wherein a small projection directed toward the center is formed on the wall extending axially from an end portion of an inner peripheral surface of a fitting portion formed on an insulating member. The canned motor pump according to claim 1, wherein a small hole for fitting corresponding to the small protrusion is formed in the member. 4. The holding member for holding the magnetic detection element, wherein the magnetic detection element and the fitting small hole are arranged in a T-letter shape on the head thereof.
The canned motor pump described in. 5. The canned motor pump according to claim 1, wherein the holding member holding the magnetic detection element is a flexible printed wiring board.