JP2001304198A - Magnetic coupling pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately detect a rotation angle position of rotor by extinguishing a dispersion of a space of a hall element and a magnet part of the rotor. SOLUTION: In the magnetic bonding pump 1, a pump chamber 5 and a motor chamber 7 are separated by a partition wall 6, a circuit board 20 is disposed in the motor chamber 7 in parallel to an edge surface 29 of a rotor 9 in the pump chamber 5 and a hall element 34 is provided on the circuit board 20 part opposed to a magnet part of the rotor 9. A plurality of support members 28 are projectedly provided from a partition wall part 30 opposed to an edge surface 29 of the rotor 9 to the motor chamber 1 side and a compression spring 37 is disposed on an extension line of a rotation shaft part 13 of the rotor 9. A molten synthetic resin is flowed and solidified in the motor chamber 7 in the state that the circuit board 20 is urged to respective edge surface 31 of a plurality of support members 28 by the compression spring 37.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a magnetic coupling pump,
In particular, the present invention relates to a magnetic coupling pump for eliminating variations in the distance between a magnetism detecting element mounted on a circuit board and a magnet portion of a rotor.

[0002]

2. Description of the Related Art In general, a magnetically coupled pump is partitioned into a pump chamber and a motor chamber by a partition, a circuit board is disposed in the motor chamber in parallel with an end face of a rotor in the pump chamber, and a magnetic section of the rotor is provided. The magnetic detecting element is mounted on the opposing circuit board portion. Here, the magnetic detecting element detects the rotational angle position of the rotor in order to control the timing of energizing the coil of the stator (for example, see Japanese Patent Application Laid-Open No. HEI 4-1992).
353291).

Conventionally, as disclosed in Japanese Patent Application Laid-Open No. 10-9185, a circuit board is held by a plurality of mounting members integrally formed on a bobbin of a stator.

[0004]

However, in the conventional magnetic coupling pump described in Japanese Patent Application Laid-Open No. 10-9185, when a magnetic detecting element is mounted on a circuit board portion facing an end face of a rotor, a plurality of magnetic detecting elements are required as described above. Since the mounting member is integrally formed with the bobbin of the stator, the position of the mounting member fluctuates depending on the mounting position of the stator, and the gap between the magnetic sensing element and the magnet portion of the rotor is varied. There has been a problem that the output of the element varies, and the rotational angle position of the rotor cannot be detected with high accuracy.

The present invention solves the above-mentioned conventional problems, eliminates variations in the distance between the magnetic detecting element and the magnet portion of the rotor, and enables magnetic coupling capable of accurately detecting the rotational angle position of the rotor. It is intended to provide a pump.

[0006]

A magnetic coupling pump according to the present invention is divided into a pump chamber and a motor chamber by a partition, and a circuit board is arranged in the motor chamber in parallel with an end face of a rotor in the pump chamber. And, in a magnetic coupling pump in which a magnetic detection element is mounted on a circuit board part facing the magnet part of the rotor, a plurality of support members are protruded from the partition part facing the rotor end face toward the motor chamber side, and A compression spring is arranged on an extension of the rotation shaft of the rotor, and the synthetic resin is poured and solidified into the motor chamber while the circuit board is pressed against each end face of the plurality of support members by the compression spring. It is characterized by comprising.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows a sectional view of a magnetic coupling pump.

In FIG. 1, a magnetic coupling pump 1 includes a pump housing side housing 4 made of a synthetic resin in which an inflow passage 2 and an outflow passage 3 for a fluid, for example, cooling water are formed, and a pump room 5 together with the pump room side housing 4. And a synthetic resin motor chamber side housing 8 that forms a motor chamber 7 together with the body 6, the pump chamber side housing 4 and the body 6, and the body 6 and the motor chamber. The side housings 8 are integrated by welding.

The pump chamber 5 contains a rotor 9 made of synthetic resin.

The rotor 9 is formed in a substantially cylindrical cup shape. A cylindrical bearing 11 made of PPS (polyphenylene sulfide) material is provided at the center of the bottom 10, and an impeller 12 is provided around the bearing 11. Is formed. The shaft 13 is inserted through the through hole of the bearing 11, and the rotor 9 is rotatable around the shaft 13. The shaft 13 is partially fixed to the body 6 as an insert body, and a spiral portion 14 for preventing rotation and detachment of the shaft 13 with respect to the body 6 is embedded in the body 6. At the tip of the shaft 13,
A washer 15 as a stopper member for preventing the rotor 9 from floating during rotation is attached by a screw 16. The cylindrical portion 17 of the rotor 9 is made of a plastic magnet containing a magnetic powder and partially magnetized in the circumferential direction. Rotate.

The motor chamber 7 is filled with a synthetic resin material except for a part on the motor chamber side housing 8 side. The circuit board 20 is embedded in the filling member 19.

The circuit board 20 has a through hole 21 through which the boss 22 of the body 6 is inserted. The boss 22 is formed on an extension axis of the shaft 13,
The front end surface 23 is substantially flush with the end surface 24 of the body 6 on the side of the motor chamber side housing 8.

The substrate surface 25 on the rotor 9 side of the circuit substrate 20
, A stator 18 is mounted via a wiring fitting 26, and the stator 18 is housed in an annular recess 27 of the body 6.

The board surface 25 of the circuit board 20 on the rotor 9 side is in contact with a plurality of support members 28. Each support member 28 is formed integrally with the body 6, and each support member 28 has a ring-shaped wall portion 30 facing the end surface 29 of the cylindrical portion 17 of the rotor 9.
, And project in the direction of the motor chamber side housing 8, and the end surfaces 31 of the support members 28 are flush with each other.

An inner terminal 32 is mounted on the board surface 25 of the circuit board 20 on the rotor 9 side, and the inner terminal 32 is in contact with an outer terminal 33 for power supply fixed to the body 6. .

A Hall element 34 as a magnetic detecting element is mounted on the substrate surface 25 of the circuit board 20 on the rotor 9 side. The Hall element 34 is a sensor for detecting the rotation angle position of the rotor 9, and faces the end surface 29 of the cylindrical portion 17 of the rotor 9.

A compression spring 37 is disposed between the other substrate surface 35 of the circuit board 20 and the inner surface 36 of the motor chamber side housing 8 so as to surround the boss 22 for preventing spring buckling.

Next, a method of manufacturing the magnetic coupling pump 1 on the motor chamber 7 side will be described with reference to FIGS.

First, the stator 18, the hall element 34, the inner terminal 32 and the like are mounted on the circuit board 20. Then, as shown in FIG. 2, the boss portion 22 of the body 6 is passed through the through hole 21 of the circuit board 20 and the annular recess 27 of the body 6 is formed.
And the inner terminal 32 and the outer terminal 33 are connected. Further, a compression spring 37 is fitted around the boss portion 22, and a temporary mounting plate (not shown) in place of the motor chamber side housing 8 abuts and is fixed to the end face 24 of the body 6 on the motor chamber side housing 8 side, and the temporary assembly The compression spring 37 is held between the inner surface of the attachment plate and the other substrate surface 35 of the circuit board 20. At this time, the circuit board 20 is pressed against each end face 31 of the plurality of support members 28 by the elastic force of the compression spring 37.
Then, the motor chamber 7 is positioned so that the stator 18 side is located at a lower position.
The molten synthetic resin is poured into the motor chamber 7 with the vertical direction set. After the solidification of the synthetic resin, the temporary assembly plate is removed, and the motor chamber side housing 8 is welded to the end face 24 of the body 6 on the motor chamber side housing 8 side.

Thus, the motor chamber 7 side as shown in FIG. 1 is manufactured.

As described above, in the present embodiment, the partition 6 separates the pump chamber 5 and the motor chamber 7 from each other, and the motor board 7 has a circuit board parallel to the end face 29 of the rotor 9 in the pump chamber 5. In the magnetic coupling pump 1 in which the magnetism detecting element 34 is mounted on the circuit board 20 facing the magnet part of the rotor 9, a plurality of the magnetic coupling pumps 1 move from the partition wall part 30 facing the rotor end face 29 to the motor chamber 7 side. Support member 28
And a compression spring 37 is disposed on an extension of the rotating shaft portion 13 of the rotor 9, and the circuit board 20 is pressed against the end surfaces 31 of the plurality of support members 28 by the compression spring 37. Is formed by pouring and solidifying a molten synthetic resin.

For this reason, the circuit board 20 is
In addition, since there is no variation in the distance until the circuit board 20 is pressed by the elastic force of the compression spring 37, the molten resin can be solidified without causing the circuit board 20 to tilt. Therefore, the output of the magnetic detection element 34 is stabilized, and the rotation angle position of the rotor 9 can be detected with high accuracy.

[0024]

According to the present invention, it is possible to eliminate variations in the distance between the magnetism detecting element and the magnet portion of the rotor, and to accurately detect the rotational angle position of the rotor.

[Brief description of the drawings]

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

FIG. 2 is a sectional view showing the manufacturing process.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Magnetic coupling pump 5 Pump room 6 Partition wall 7 Motor room 9 Rotor 13 Rotating shaft part (shaft) 20 Circuit board 28 Support member 29 Rotor end surface 30 Partition part (ring-shaped wall part) 31 Support member end surface 34 Magnetic detection element 37 Compression spring

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H022 AA01 BA03 CA01 CA54 DA07 DA09 DA19 5H019 BB05 BB15 BB20 BB22 BB29 CC04 FF01 GG01 5H607 BB09 BB14 CC01 CC07 DD01 DD08 DD09 DD17 FF06 HH01 HH09 JJ01

Claims (1)

[Claims] 1. A circuit board which is partitioned by a partition into a pump chamber and a motor chamber, a circuit board is disposed in the motor chamber in parallel with an end face of a rotor in the pump chamber, and faces a magnet part of the rotor. In a magnetic coupling pump in which a magnetic detection element is mounted on a portion, a plurality of support members are protruded from a partition wall portion facing the rotor end surface to the motor chamber side, and a compression spring is provided on an extension of a rotation shaft portion of the rotor. A magnetic coupling pump is provided, wherein a molten synthetic resin is poured into the motor chamber and solidified while the circuit board is pressed against each end face of the plurality of support members by the compression spring.