KR102510786B1 - Magnetic drive pump - Google Patents

Abstract

The magnetically driven pump (1) includes a seat unit (2), a motor unit (3) and a leak detector (4). The motor unit 3 includes a rotor 31, an inner case body 32, an outer case body 33 and a stator 34. The inner case body 32 has an inner end wall 322 . The outer case body 33 is sleeved over the inner case body 32 and has an outer end wall 332 . The outer end wall 332 together with the inner end wall 322 form a liquid containment space 337 therebetween. The leak detector 4 is disposed on one side of the outer end wall 332 facing the liquid accommodating space 337, and the sensor 41 for detecting a change in capacitance between the liquid accommodating space and the sensor 41 includes

Description

Magnetic drive pump {MAGNETIC DRIVE PUMP}

The present disclosure relates to pumps, particularly magnetically driven pumps.

A conventional magnetic drive pump disclosed in Taiwan Patent No. 1424661 includes a front cover, a support frame, an impeller, a cup-shaped rear cover, an inner rotor, an outer rotor, a fixed shaft and a handling frame. The back cover has a double layer structure and includes an inner lining made of fluororesin material and a reinforced layer.

The inner lining and the reinforcing layer are in contact with each other to form the double-layer structure of the back cover. When the magnetic drive pump is used in a piece of chemical treatment equipment in this way, if the inner lining is damaged, the chemical solution may leak into the gap between the inner lining and the reinforcing layer through cracks in the inner lining. However, since leakage through the inner lining cannot be detected with a conventional magnetic pump, the chemical solution may further leak into the outer rotor and corrode the outer rotor. As a result, the magnetic drive pump malfunctions.

Accordingly, it is an object of the present disclosure to provide a magnetically driven pump capable of mitigating the disadvantages of the prior art.

According to the present disclosure, a magnetic drive pump includes a seat unit, a motor unit and a leak detector. The seat unit includes a fixed seat, a peripheral seat and a seat base. A fixed seat surrounds the shaft. The peripheral sheet is sleeved on the fixed sheet. The seat base is for placing the peripheral seat thereon. The motor unit includes a rotor, an inner case body, an outer case body and a stator. The rotor is rotatable about an axis. An inner case body surrounds the rotor. The outer case body is sleeved over the inner case body. The stator surrounds the outer case body and is surrounded by a fixed seat axially. The inner case body has an inner peripheral wall and an inner end wall. An inner perimeter wall encloses the rotor and has two inner opposed ends axially spaced from each other. The inner end wall is connected to one of the inner opposite ends. The inner perimeter wall and the inner end wall cooperatively form a placement space open at the other of the inner opposite ends and in which the rotor is placed. The outer case body has an outer peripheral wall and an outer end wall. The outer perimeter wall is sleeved on the inner perimeter wall, is surrounded by the stator, and has two outer opposed ends axially spaced from one another. The outer end wall is connected to one of the outer opposite ends and is located on one side of the inner end wall opposite the placement space. The outer end wall forms a liquid containment space therebetween with the inner end wall. The leak detector is disposed on one side of the outer end wall opposite the liquid accommodating space and includes a sensor for detecting a capacitance change between the liquid accommodating space and the sensor.

Other features and advantages of the present disclosure will become apparent from the following detailed description of embodiments with reference to the accompanying drawings.
1 is a perspective view showing an embodiment of a magnetic drive pump according to the present disclosure.
2 is a partially exploded perspective view of the embodiment.
3 is a cross-sectional view of an embodiment.

1 to 3 , an embodiment of a magnetic drive pump 1 according to the present disclosure includes a seat unit 2, a motor unit 3, a leak detector 4 and a cover 5.

The seat unit 2 includes a fixed seat 21 , a peripheral seat 22 and a seat base 23 . A fixed seat 21 surrounds the axis L. The peripheral sheet 22 is sleeved on the fixed sheet 21 . The seat base 23 is the one on which the peripheral seat 22 is placed.

The motor unit 3 is disposed on the seat unit 2 and includes a rotor 31, an inner case body 32, an outer case body 33 and a stator 34. The rotor 31 is rotatable about an axis (L). The inner case body 32 surrounds the rotor 31 . The outer case body 33 is sleeved on the inner case body 32 . The stator 34 surrounds the outer case body 33 and is surrounded by the fixed seat 21 of the seat unit 2 about the axis L.

The inner case body 32 of the motor unit 3 has an inner peripheral wall 321 and an inner end wall 322 . The inner peripheral wall 321 surrounds the rotor 31 of the motor unit 3 and has two inner opposite ends spaced from each other in the direction of the axis L. The inner end wall 322 is connected to one of the inner opposite ends of the inner peripheral wall 321 . The inner peripheral wall 321 and the inner end wall 322 together form a placement space 323 open at the other one of the inner opposite ends and in which the rotor 31 is placed. Moreover, the inner end wall 322 has an inner annular section 324 , an inner end section 325 and an inner connecting section 326 . The inner annular section 324 is annular and connected to the inner peripheral wall 321 of the inner case body 32, radially and inwardly from one of the inner facing ends of the inner peripheral wall 321 towards the axis L. is associated with Inner end section 325 is spaced apart from inner annular section 324 in the direction of axis L. The inner connecting section 326 surrounds the axis L and interconnects the inner edge of the inner annular section 324 proximate the axis L and the inner end section 325 in the direction of the axis L.

The outer case body 33 of the motor unit 3 has an outer peripheral wall 331 and an outer end wall 332. The outer peripheral wall 331 is sleeve-fitted on the inner peripheral wall 321 of the inner case body 32 and is surrounded by the stator 34 of the motor unit 3, in the direction of the axis L. It has two externally opposed ends spaced apart from each other. The outer end wall 332 is connected to one of the outer opposite ends and is located on one side of the inner end wall 322 opposite the placement space 323 . In addition, the outer end wall 332 includes an outer annular section 334, an outer end section 335, an outer connecting section 336, and a protruding wall section adjacent to the seat base 23 of the seat unit 2 ( 333) is provided. The outer annular section 334 is connected to the outer peripheral wall 331 . The outer end section 335 is spaced apart from the outer annular section 334 in the direction of the axis L. The outer connecting section 336 surrounds the axis L and interconnects the inner edge of the outer annular section 334 proximal to the axis L and the outer end section 335 in the direction of the axis L. The protruding wall section 333 projects from the outer annular section 334 and away from the inner end section 325 of the inner end wall 322 of the inner case body 32, and is connected to the outer connecting section 336. Also, the protruding wall section 333 together with the inner end section 325 and the inner connection section 326 of the inner end wall 322 form a liquid accommodating space 337 . The liquid accommodating space 337 is located below the axis L, and its volume ranges from 2 to 5 cubic centimeters (cm 3 ).

The leak detector 4 is disposed on one side of the protruding wall section 333 of the outer end wall 332 facing the liquid infusion space 337 and includes a sensor 41 . The sensor 41 is for detecting a change in capacitance between the liquid accommodating space 337 and the sensor 41 . In this embodiment, sensor 41 is a capacitive proximity sensor.

The cover 5 abuts on the outer end wall 332 of the outer case body 33 of the motor unit 3 and is bolted to the fixing seat 21 of the seat unit 2, so that the leak detector 4 is located between the protruding wall section 333 of the outer end wall 332 and the cover 5 .

When the motor unit 3 is in operation of a piece of chemical treatment equipment, the sensor 41 can continuously detect a change in capacitance between the sensor 41 and the liquid accommodating space 337 . If the inner case body 32 of the motor unit 3 is once damaged, the chemical liquid penetrates the inner end wall 322 of the inner case body 32 and the outer case body 33 through cracks in the inner case body 32. It leaks into the gap between the outer end wall 332 and then into the liquid containing space 337 . Since the liquid accommodating space 337 can collect the chemical liquid, the stator 34 of the motor unit 3 can be prevented from being directly exposed to the leaked chemical liquid. The presence of the chemical liquid in the liquid accommodating space 337 causes a change in capacitance between the liquid accommodating space 337 and the sensor 41 , and this change can be detected by the sensor 41 . As soon as the sensor 41 detects a change, a control member (not shown) electronically connected to the sensor 41 may warn the user about the leak or stop the operation of the motor unit 3 . Therefore, the stator 34 is prevented from being corroded by the chemical liquid, and the motor unit 3 does not malfunction.

In summary, it is formed by the protruding wall section 333, the inner end section 325, and the inner connection section 326 of the motor unit 3, and the inner case body 32 and the outer case of the motor unit 3 By means of the liquid accommodating space capable of collecting the liquid leaked between the body 33 and the sensor 41 capable of detecting a change in capacitance between the liquid accommodating space 337 and the sensor 41, The magnetic drive pump 1 can be prevented from malfunctioning. Thus, the object of the present disclosure is surely achieved.

In the above description, for purposes of explanation, numerous specific details are set forth in order to provide a thorough understanding of the embodiments. However, it will be apparent to one skilled in the art that one or more other embodiments may be practiced without some of these specific details. It should also be understood that references throughout this specification to "one embodiment," "an embodiment," an embodiment having an ordinal designation, or the like, mean that a particular feature, structure, or characteristic may be included in practice of the present disclosure. . Moreover, in the foregoing description, various features are sometimes grouped together in a single embodiment, drawing, or description thereof, in order to simplify the disclosure and facilitate understanding of various inventive aspects, and one or more features or specific details from an embodiment are In practicing the present disclosure, it should be understood that, where appropriate, one or more features or specific details from other embodiments may be practiced.

Although the present disclosure has been described with respect to what is considered exemplary embodiments, the present disclosure is not limited to the disclosed embodiments, but covers a variety of configurations included within the broadest spirit and scope of interpretation to include all such modifications and equivalent configurations. It is understood that it is intended to

Claims (7)

In the magnetic drive pump,
As a seat unit,
a fixed seat enclosing the shaft;
a peripheral sheet sleeved on the fixed sheet, and
the seat unit including a seat base on which the peripheral sheet is disposed;
As a motor unit,
a rotor rotatable about an axis;
An inner case body surrounding the rotor,
An outer case body sleeved on the inner case body, and
A stator that surrounds the outer case body and is axially surrounded by the fixed seat, wherein the inner case body surrounds the rotor and has an inner peripheral wall having two inner opposite ends spaced apart from each other in an axial direction, and the inner outer case body an inner end wall connected to one of the ends, the inner peripheral wall and the inner end wall cooperatively forming a placement space open at the other of the inner opposite ends and in which the rotor is disposed; , wherein the outer case body is sleeved on the inner peripheral wall, is surrounded by the stator, and has an outer peripheral wall having two outer facing ends spaced apart from each other in an axial direction, and the outer facing ends. an outer end wall connected to one and located on one side of the inner end wall opposite the placement space, the outer end wall together with the inner end wall forming a liquid accommodating space therebetween; the motor unit, including a stator; and
a leak detector disposed on one side of the outer end wall opposite the liquid accommodating space and having a sensor, the sensor for detecting a change in capacitance between the liquid accommodating space and the sensor; including,
The inner end wall of the inner case body of the motor unit,
an inner annular section connected to the inner peripheral wall;
an inner end section spaced apart from the inner annular section in an axial direction; and
an inner connecting section surrounding an axis and interconnecting an inner edge of the inner annular section proximal to the axis and the inner end section in an axial direction;
The outer end wall of the outer case body of the motor unit,
an outer annular section connected to the outer perimeter wall;
an outer end section spaced apart from the outer annular section in an axial direction; and
an outer connecting section surrounding the shaft and interconnecting in the axial direction the outer end section with an inner edge of the outer annular section proximal to the shaft;
The outer end wall of the outer case body of the motor unit protrudes from the outer annular section of the outer end wall and away from the inner end section of the inner end wall, to the outer connecting section of the outer end wall. further comprising a protruding wall section connected thereto;
the protruding wall section together with the inner end section and the inner connection section of the inner end wall form the liquid accommodating space; and
The leak detector is disposed on one side of the protruding wall section facing the liquid accommodation space.
magnetic drive pump. delete delete According to claim 1,
the projecting wall section of the outer end wall of the outer case body is close to the seat base of the seat unit; and
The liquid accommodating space is located below the shaft
magnetic drive pump. According to claim 4,
and a cover abutting on the outer end wall of the outer case body of the motor unit and bolted to the fixing seat of the seat unit, wherein the leak detector is installed between the projecting wall section of the outer end wall and the cover. located in
magnetic drive pump. According to claim 5,
The volume of the liquid accommodating space is in the range of 2 to 5 cubic centimeters (cm 3 )
magnetic drive pump. According to claim 1,
The volume of the liquid accommodating space is in the range of 2 to 5 cubic centimeters (cm 3 )
magnetic drive pump.

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