TWI746299B - Permanent magnet pump with leak detection function - Google Patents

Abstract

A permanent magnet pump with leak detection function includes a base unit, a motor unit, and a leak detection sensor. The motor unit includes a rotor, an inner casing set on the outer side of the rotor, an outer casing set on the outer side of the inner casing, and a stator. The inner shell has an inner surrounding wall and an inner side wall, and the inner surrounding wall and the inner side wall jointly define an accommodating space. The outer shell has an outer surrounding wall and an outer side wall, and the outer side wall has a convex wall part that defines a water collection tank together with the inner side wall. The leak detection sensor includes a sensing module for sensing the change of the electrostatic capacity between the water collection tank and itself. The chemical liquid leaking between the inner shell and the outer shell can flow into the water collection tank and be detected by the leak detection sensor in real time to avoid subsequent damage.

Description

Permanent magnet pump with leak detection function

The invention relates to a permanent magnet pump, in particular to a permanent magnet pump with leakage detection function.

There is a magnetic drive pump as shown in the Taiwan Certificate Number I424661 Patent Case, which includes a front cover, a support frame, an impeller, a back cover, an inner rotor, an outer rotor, a fixed shaft and a drag The back cover is cup-shaped and has a two-layer shell structure, and has a back cover lining made of fluoroplastic and a strengthening layer.

Although this kind of magnetically driven pump uses the back cover lining and the strengthening layer to form a two-layer shell structure, the edge contour range of the strengthening layer is smaller than the contour range of the back cover lining, so that when the rear cover When the cover lining is cracked, the leaked chemical liquid will spread along the gap between the back cover lining and the strengthening layer, and will abut the back cover lining from the edge of the strengthening layer It leaks to the outer rotor, and the leaked chemical liquid will corrode the outer rotor and cause damage to the motor.

Therefore, the purpose of the present invention is to provide a permanent magnet pump with leakage detection function that overcomes the disadvantages described in the prior art.

Therefore, the permanent magnet pump with leak detection function of the present invention includes a base unit, a motor unit, and a leak detection sensor. The base unit includes a positioning seat surrounding an axis, a ring seat set on the positioning seat, and a base for setting the ring seat. The motor unit includes a rotor that rotates around the axis, an inner casing set on the outer side of the rotor, an outer casing set on the outer side of the inner casing, and a circumferentially provided on the positioning seat and the outer casing Between the stator. The inner casing has an inner surrounding wall surrounding the rotor, and an inner side wall connected to one side of the inner surrounding wall along the extending direction of the axis. The inner surrounding wall and the inner side wall jointly define an axis along the axis The accommodating space opened toward the direction away from the inner side wall for the rotor. The outer shell has an outer surrounding wall surrounding the stator and the inner surrounding wall, and an outer side wall connected to the outer surrounding wall and located on the side of the inner side wall opposite to the accommodating space, the outer side wall having a It protrudes away from the inner side wall and defines a convex wall part of a water collection tank together with the inner side wall. The leakage sensor is arranged on the side of the convex wall opposite to the water collection tank, and includes a sensing module for sensing the change of the electrostatic capacity between the water collection tank and itself.

The effect of the present invention is that by arranging the water collection tank, the chemical liquid leaking between the inner casing and the outer casing can be converged to the water collection tank, and the water collection tank can be connected to itself through the leak detection sensor. The change in electrostatic capacity can be sensed, so when the chemical liquid leaks, it can be sensed immediately, avoiding subsequent damage.

Referring to Figures 1, 2 and 3, an embodiment of the permanent magnet pump 1 with leak detection function of the present invention includes a base unit 2, a motor unit 3, a leak detection sensor 4, and a back cover 5.

The base unit 2 includes a positioning base 21 surrounding an axis L, a ring base 22 set on the positioning base 21, and a base 23 for the ring base 22 to be set.

The motor unit 3 includes a rotor 31 that rotates around the axis L, an inner housing 32 set on the outside of the rotor 31, an outer housing 33 set on the outer side of the inner housing 32, and a circumferentially located The stator 34 between the positioning seat 21 and the outer shell 33.

The inner casing 32 has an inner surrounding wall 321 surrounding the rotor 31, and an inner side wall 322 connected to one side of the inner surrounding wall 321 along the extending direction of the axis L. The inner surrounding wall 321 and the inner The side walls 322 jointly define an accommodating space 323 that opens along the axis L toward a direction away from the inner side wall 322 for the rotor 31 to be disposed. The inner side wall 322 has an inner side portion 324 connected to the inner surrounding wall 321, an inner top portion 325 spaced from the inner side portion 324 along the extending direction of the axis L, and a position adjacent to the axis L from the inner side portion 324 The inner connecting portion 326 that connects the inner top 325 along the extending direction of the axis L and surrounds the axis L.

The outer casing 33 has an outer surrounding wall 331 surrounding the stator 34 and the inner surrounding wall 321, and an outer side connected to the outer surrounding wall 331 and located on the side of the inner side wall 322 opposite to the accommodating space 323壁332. The outer side wall 332 has a convex wall portion 333 adjacent to the base 23, an outer portion 334 connected to the outer surrounding wall 331, an outer top portion 335 spaced from the outer portion 334 along the extending direction of the axis L, and An outer connecting portion 336 connecting the outer top portion 335 from the outer portion 334 adjacent to the axis L along the extending direction of the axis L and surrounding the axis L. The convex wall portion 333 protrudes from the outer portion 334 in a direction away from the inner portion 324 and connects to the outer connecting portion 336. The convex wall portion 333, the inner connecting portion 326 and the inner portion 324 jointly define an axial line The water collection tank 337 below L, the capacity of the water collection tank 337 is in the range of 2 ml to 5 ml.

The back cover 5 is disposed on the outer side wall 332 and is screwed and fixed to the positioning base 21 so that the leak detection sensor 4 is located between the convex wall portion 333 and the back cover 5.

The leak detection sensor 4 is disposed on the side of the convex wall portion 333 opposite to the water collection tank 337, and includes a sensing module 41 for sensing the change of the electrostatic capacity between the water collection tank 337 and itself. In this embodiment, the sensing module 41 is an electrostatic capacitance proximity switch, which can be short-circuited or disconnected according to whether a certain degree of electrostatic capacitance is sensed.

When the motor unit 3 is operating, the sensing module 41 can continuously sense the change in the electrostatic capacity between the water collection tank 337 and itself outside the convex wall portion 333. Once the inner casing 32 is damaged, the chemical The liquid flows along the gap between the inner side wall 322 and the outer side wall 332 to the water collection tank 337. Due to the appearance of the chemical liquid, the electrostatic capacitance changes between the sensing module 41 and the chemical liquid, and passes through a The controller (not shown) electrically connected to the sensing module 41 issues an alarm or stops performing the operation of the motor unit 3, so that subsequent maintenance can be performed to prevent the chemical liquid from further leaking to the stator 34 and causing the The damage of the motor unit 3 can also avoid more serious work safety problems.

In summary, the permanent magnet pump 1 with leakage detection function of the present invention defines the water collection tank 337 by the convex wall portion 333, the inner portion 324 and the inner connecting portion 326. When the inner casing 32 and The chemical liquid leaks out of the outer shell 33, which can flow into the water collection tank 337, and through the leak detection sensor 4, the electrostatic capacitance change between the water collection tank 337 and itself can be detected in real time, so as to avoid subsequent occurrences. Damaged, it can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited by this, all simple equivalent changes and modifications made in accordance with the scope of the patent application of the present invention and the content of the patent specification still belong to Within the scope covered by the patent of the present invention.

1: Permanent magnet pump with leak detection function 2: base unit 21: positioning seat 22: Ring seat 23: Pedestal 3: Motor unit 31: Rotor 32: inner shell 321: Inner Surrounding Wall 322: inner wall 323: accommodating space 324: Inside 325: inner top 326: Internal connection 33: outer shell 331: Outer Surrounding Wall 332: Outer wall 333: Convex Wall 334: Outer part 335: outer top 336: External connection 337: Sump 34: Stator 4: Leak detection sensor 41: Sensing module 5: back cover L: axis

Other features and effects of the present invention will be clearly presented in the embodiments with reference to the drawings, in which: Fig. 1 is a perspective view of an embodiment of a permanent magnet pump with leakage detection function of the present invention; Figure 2 is an incomplete three-dimensional exploded view of the embodiment; and Fig. 3 is a schematic cross-sectional view of the embodiment.

1: Permanent magnet pump with leak detection function

2: base unit

21: positioning seat

22: Ring seat

23: Pedestal

31: Rotor

32: inner shell

321: Inner Surrounding Wall

322: inner wall

323: accommodating space

324: Inside

325: inner top

326: Internal connection

33: outer shell

331: Outer Surrounding Wall

332: Outer wall

333: Convex Wall

334: Outer part

335: outer top

336: External connection

337: Sump

34: Stator

4: Leak detection sensor

41: Sensing module

5: back cover

L: axis

Claims (6)

A permanent magnet pump with leak detection function, including: A base unit, including a positioning seat surrounding an axis, a ring seat set on the positioning seat, and a base for setting the ring seat; A motor unit includes a rotor that rotates around the axis, an inner casing set on the outer side of the rotor, an outer casing set on the outer side of the inner casing, and a surrounding set on the positioning seat and the outer casing Between the stator, the inner casing has an inner surrounding wall surrounding the rotor, and an inner side wall connected to one side of the inner surrounding wall along the extending direction of the axis, the inner surrounding wall and the inner side wall being common A accommodating space opened along the axis in a direction away from the inner wall is defined for the rotor to be installed, and the outer casing has an outer surrounding wall surrounding the stator and the inner surrounding wall, and a connection to the outer surrounding wall A wall and an outer side wall located on the side of the inner side wall opposite to the accommodating space, the outer side wall having a convex wall portion that protrudes away from the inner side wall and defines a water collection tank together with the inner side wall; and A leak detection sensor is arranged on the side of the convex wall opposite to the water collection tank, and includes a sensing module for sensing the change of the electrostatic capacity between the water collection tank and itself. The permanent magnet pump with leak detection function according to claim 1, wherein the inner side wall has an inner side portion connected to the inner surrounding wall, an inner top portion spaced from the inner side portion along the extending direction of the axis, and An inner connecting portion connecting the inner top portion and surrounding the axis from the inner side portion adjacent to the axis along the extension direction of the axis, the outer side wall further has an outer portion connecting the outer surrounding wall, and an inner connecting portion connected with the outer portion The outer top portions spaced apart in the extending direction of the axis, and an outer connecting portion connecting the outer top portion along the extending direction of the axis from the outer portion adjacent to the axis and surrounding the axis. The permanent magnet pump with leak detection function according to claim 2, wherein the convex wall portion protrudes from the outer portion in a direction away from the inner portion and is connected to the outer connecting portion, and the convex wall portion is connected to the inner portion The inner part and the inner part jointly define the water collection tank. The permanent magnet pump with leak detection function according to claim 3, wherein the convex wall portion is adjacent to the base, so that the water collection tank is located below the axis. The permanent magnet pump with leak detection function according to claim 4, further comprising a back cover arranged on the outer side wall and screw-locked to the positioning base, so that the leak detection sensor is located between the convex wall part and the positioning base. Between the back cover. The permanent magnet pump with leak detection function according to claim 5, wherein the capacity of the water collection tank is in the range of 2 ml to 5 ml.

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