JP2001280284A - Canned pump - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the occurrence of detective detection by improving detecting sensitivity in a way to decrease a gap between a sensor and a permanent magnet when the sensor to detect a change in the magnetic field of a permanent magnet 4 is disposed opposite to a can cylinder bottom part 2, in a canned pump. SOLUTION: A radiation rib-form thick part 2d is formed at the can cylinder bottom part 2 and some part of a portion ranging the thick part 2d forms a thin part 2e. By mounting a sensor 12 on a control panel 10 such that the sensor is positioned opposite to the thin part 2e, the sensor 12 can be disposed in a fitted-in state to overlap the sensor 12 with the thick part 2d, resulting in reduction of a gap X between the sensor 12 and the permanent magnet 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of a canned pump in which a pump means and a rotor are housed in a can and a stator core is arranged outside the can.

[0002]

2. Description of the Related Art Generally, this type of canned pump accommodates a pump means and a rotor having a permanent magnet in a cylindrical can with a bottom, and arranges a stator core on the outer peripheral side of the can to provide a can at the bottom of the cylinder of the can. A control board on which control components such as electric and electronic components are mounted is arranged to face each other. In this case, in order to control the rotation of the rotor, a sensor (Hall IC) for detecting the number of rotations (rotation speed) of the rotor is provided on the control board side, and the sensor detects a change in the magnetic field of the permanent magnet that rotates integrally with the rotor. The rotation is controlled by calculating the rotation speed (rotation speed) based on this change. In this case, since the can does not form a magnetic path, it is formed of a non-magnetic metal material such as aluminum or a resin material.

[0003]

As shown in FIGS. 7 and 8, a bottom surface 13a of a bottomed cylindrical can 13 has a central portion for fixing and supporting a core shaft. The wall thickness remained almost the same. For this reason, when a sensor 14 (Hall IC) for detecting a change in the magnetic field of the permanent magnet 4 is provided on the surface of the control board 10 facing the can cylinder bottom portion 13a (shown by a virtual line), the sensor 14 The gap between the sensor 14 and the can bottom surface 13a, the thickness of the bottom surface 13a, and the thickness of the bottom surface 13a.
The gap between the “a” and the permanent magnet 4 is a gap Y. The gap Y is inevitably increased due to the thickness of the cylindrical bottom portion 13a, resulting in a decrease in sensitivity, and a detection failure or a detection leak occurs. There is a problem. Therefore, conventionally, a dedicated board 10 is moved from the control board 10 toward the outer peripheral surface of the can 13.
a, and a sensor 15 is provided on the substrate 10a.
However, when the sensor is provided on the substrate 10a dedicated to the sensor, the number of components is increased, not only the structure becomes complicated, but also the cost becomes disadvantageous. There are issues. In addition, it is necessary to make the can peripheral surface partly thick in order to secure the required strength. As a result, the entire canned pump has a large diameter, which hinders miniaturization. There is a problem to be solved by the invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and has been made to solve these problems. A permanent magnet is provided inside a cylindrical can with a bottom. A rotor and pump means are provided, a stator core is arranged on the outer peripheral side, and control electricity and
In a canned motor provided with a control board on which components such as electronic components are mounted, when a sensor for detecting a change in the magnetic field of a permanent magnet is provided on a surface of the control board facing a bottom surface of the can cylinder, the can cylinder The bottom portion is formed with a thick portion for reinforcing the cylinder bottom portion, and a thin portion which is thinner on the can cylinder bottom side with respect to the thick portion.
The sensor is provided in a position facing a thin portion avoiding the thick portion. With this configuration, the sensor faces the thin portion of the control board while the sensor is mounted on the surface of the control board facing the can cylinder bottom, so that the control board can be closer to the can cylinder bottom. Thus, the gap between the sensor and the permanent magnet can be reduced, and a decrease in sensitivity can be avoided. In this device, when components other than the sensor are to be mounted on the surface of the control substrate facing the bottom of the can cylinder, the mounted components are also provided at positions facing the thin portions avoiding the thick portions. In such a case, the control board can be arranged close to the bottom surface of the can cylinder while taking the mounted components into consideration. In these, the thick portion may be characterized in that a plurality of rib-shaped portions are formed radially, and a thin portion is formed between the rib-shaped thick portions,
By doing so, the thick portion for reinforcing the bottom portion of the can cylinder can be made as small as possible, and the space for mounting components on the control board can be widened. Further, in these, the outer peripheral portion of the can is made thin, and a reinforcing piece for reinforcing the thin outer peripheral portion is formed on the outer peripheral surface of the thin outer peripheral portion so as to protrude. Then, the thickness of the outer peripheral surface of the can can be measured. In addition, in this case, the reinforcing piece is fitted in a gap between adjacent teeth formed on the stator core, and in this case, the reinforcing piece disposing space overlaps with the stator core side. Can be done.

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the figure, reference numeral 1 denotes a canned pump. The canned pump 1 has a core shaft 3 fixedly supported by the can 2 on the inner peripheral side of a cylindrical can 2 having a bottom, which will be described later. A rotor 5 having a permanent magnet 4 rotatably supported via a bearing 3a, and an impeller 6 constituting pump means fixed to the rotor 5 are provided. On the other hand, a casing 7 is provided on the outer peripheral side of the can 2 so that the can 2 can be loosely fitted therein. The inner peripheral surface 7a of the casing 7 is stopped so as to face the outer peripheral surface of the can 2. A stator core portion 8 to be attached and a stator coil 9 wound around the stator core portion 8 are provided. Further, a control board 10 on which components 11 such as various electric and electronic components are mounted is arranged at an end of the stator core 8 on the casing cylinder bottom side so as to face the cylinder bottom 2 a of the can 2. .

[0006] The can 2 has a fixing portion 2 for fitting and fixing an end of the core shaft 3 to the center of the cylindrical bottom portion 2a.
b is formed in a recessed shape, but the fixing portion 2b is thick and secures strength. The cylindrical bottom portion 2a has a flange shape from the base end of the fixing portion 2b toward the outer diameter direction, but has a disk-shaped thick portion 2c up to an intermediate position in the outer diameter direction.
On the outer peripheral side from the disc-shaped thick portion 2c, a rib-shaped thick portion 2d is formed radially to reinforce the cylindrical bottom portion 2a, and between the rib-shaped thick portion 2d. The bottom portion is thinner on the rotor 5 side than the rib-shaped pressure-pressing surface portion 2d to form a thin portion 2e reaching the outer periphery. Further, the peripheral surface portion 2f of the can 2 is thinner in the same manner as the thinner portion 2e, but the outer peripheral surface of the peripheral surface portion 2f is formed between the distal ends of the teeth 8a of the stator core portion 8 formed in a substantially T shape. A rib piece 2g that fits into the gap is projected and formed to reinforce the thin peripheral surface portion 2f.

On the other hand, the control board 10 facing the can bottom face 2a is provided on each of the front and back sides of the control board 10 so as to avoid the disc-shaped thick portion 2c and the rib-shaped thick portion 2d. Although the electronic component 11 is incorporated, a sensor (Hall IC) 12 for detecting a change in the magnetic field of the permanent magnet 4 due to the rotation of the rotor protrudes toward the surface (back surface) of the control substrate 10 facing the can cylinder bottom surface 2a. It is fastened in such a way.
The control substrate 10 is a member that protrudes most toward the can 2 on the back surface side. In the present embodiment, the sensor 12 is close to the thin portion 2e (for example, as shown in FIG. The gap X between the permanent magnet 4 and the permanent magnet 4 is set to be small so that the control board 10 is opposed to the thick section 2d. Part 2
a.

In the sensor configured as described above, the sensor 12 is provided in a protruding manner on the back surface of the control board 10 opposite to the can cylinder bottom portion 2a, and the protruding position is opposed to the thin portion 2e. Set to position. As a result, the control board 10 can be arranged close to the can cylinder bottom 2a to a position where the sensor 10 overlaps the rib-shaped thick portion 2d in a side view.
Accordingly, the facing distance X between the sensor 12 and the permanent magnet 4 can be set to be small, and the reduction in sensitivity can be reduced. For this reason, it is not necessary to protrude the sensor 12 from the control substrate 10 so as to face the can peripheral surface portion 2f as in the related art, and the structure can be simplified.

Further, in this device, not only the sensor 12 but also the other mounted parts 11 are provided at the opposed positions of the thin parts 2e avoiding the thick parts 2c and 2d. The substrate 10 can be arranged in the proximity as described above, so that the sensitivity of the sensor 12 is not reduced. In addition, as the thick part, the inner peripheral side is a disk-shaped thick part 2c to reinforce the center part,
In particular, the outer peripheral portion has a rib-shaped thick portion 2 extending in the radial direction.
d is reinforced so that the thick portion 2
Reliable reinforcement can be performed while reducing the area of d as small as possible, and the area of the thin portion 2e can be increased.

In the can 2, the peripheral surface 2f is also made thinner to suppress an increase in the diameter, but as a reinforcement in this case, a rib piece 2g is formed to project outward from the peripheral surface 2f in the radial direction. We are trying to reinforce this rib piece 2g
Are set so as to fit into the slots from the gaps between the adjacent teeth 8a formed in the stator core portion 8 and overlap with each other, whereby the rib pieces 2 serving as reinforcing pieces are formed.
No consideration is given to the arrangement of g.

It should be noted that the present invention is not limited to the above-described embodiment, but can be applied to a second embodiment shown in FIGS. In other words, in this device, 13 groups of drive elements (power devices) and three (plural) sensors 14 that generate heat are provided on the control board 10, but in this case, a straight line passing through the axis is formed. Drive element 13 with the pair of rib-shaped thick portions 2d as boundaries.
The group and the sensor 14 group are divided and arranged on the left and right. The sensor 14 has a rib-shaped thick portion 2
The present invention is carried out in the same manner as in the first embodiment, being arranged at an angle of 60 degrees on the back surface of the substrate 10 sandwiched between the substrates d. The drive elements 13 are arranged on the surface of the control board 10, and the terminal positions extending from the drive elements 13 are set so as to avoid the rib-shaped thick portion 2d. By arranging the drive element 13 group and the sensor 14 group separately on the right and left sides in this manner, it is possible to prevent the sensor 14 from receiving heat generated by the drive element 13 and deteriorating the sensing performance. There are advantages.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a canned pump.

FIG. 2 is a bottom view of the canned pump excluding a control board.

FIG. 3 is a horizontal sectional view of the canned pump excluding a core member.

FIG. 4 is a front view of a control board.

FIG. 5 is a front view of a control board according to a second embodiment.

FIG. 6 is a side view of the control board.

FIG. 7 is a side sectional view of a canned pump showing a conventional example.

FIG. 8 is a horizontal sectional view of the canned pump excluding a core portion.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 cand pump 2 can 2 a cylinder bottom 2 d rib-like thick part 2 e thin part 2 f peripheral part 2 g rib piece 4 permanent magnet 5 rotor 8 stator core part 10 control board 12 sensor

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Keiichi Hosoi 1-268-68, Hirosawa-cho, Kiryu-shi, Gunma Mitsuba Co., Ltd. (72) Inventor Yutaka Hirayama 1-268-1, Hirosawa-cho, Kiryu-shi, Gunma Address Mitsuba Co., Ltd. F-term (reference) 3H022 AA01 BA01 BA07 CA50 DA09

Claims (5)

[Claims] 1. A rotor having a permanent magnet provided inside a cylindrical can with a bottom and a pump means, a stator core disposed on an outer peripheral side, and electric and electronic components for control on the outer surface of the bottom of the cylinder. In a canned motor provided with a control board on which is mounted, in providing a sensor for detecting a change in the magnetic field of the permanent magnet on a surface of the control board facing the can bottom, the bottom of the can cylinder is A thick part for reinforcing the cylinder bottom part and a thin part which is thinner on the can cylinder bottom side with respect to the thick part are formed, while the sensor avoids the thick part. A canned pump provided at a position facing a thin portion. 2. A thin part in which components other than the sensor are mounted on a surface of the control board facing the bottom surface of the can cylinder, wherein the mounted components also avoid a thick part. A canned pump characterized by being provided at a position opposed to a can. 3. The thick part according to claim 1, wherein the thick part has a plurality of ribs formed radially, and a thin part is formed between the ribs. Canned pump. 4. The method according to claim 1, wherein the outer peripheral portion of the can is made thin, and a reinforcing piece for reinforcing the thin outer peripheral portion is formed on the outer peripheral surface of the thin outer peripheral portion. Characterized cand pump. 5. The canned pump according to claim 4, wherein the reinforcing piece is fitted in a gap between adjacent teeth formed on the stator core.