TWI721846B - Canned magnetic pump with leak detection function - Google Patents

Abstract

A canned magnetic pump with leak detection function, comprising a base unit, a motor unit, and a leak detection sensor. The base unit includes a positioning seat, the motor unit includes a rotor, and a set of the rotor The inner shell, the outer shell set with the inner shell, and a stator surrounding between the positioning seat and the outer shell, the inner shell has an inner surrounding wall surrounding the rotor, and a surrounding wall along the axis The extending direction is connected to the inner side wall on one side of the inner surrounding wall, the inner surrounding wall and the inner side wall jointly define a accommodating space for the rotor, the outer casing has a surrounding the stator and the inner surrounding The outer surrounding wall between the walls, and an outer side wall connecting the outer surrounding wall, the leakage sensor is arranged on the outer shell, and includes a sensor for sensing the middle of the outer side wall and the inner side wall and itself The sensing module with the change of the electrostatic capacity between the time, so that when the chemical liquid leaks, it can be sensed in real time.

Description

Canned magnetic pump with leak detection function

The invention relates to a canned magnetic pump, in particular to a canned magnetic pump with a leak 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 inner lining of the cover is cracked, the leaked chemical liquid will spread along the gap between the inner lining of the back cover and the strengthening layer, and abut the inner lining of the back cover 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 canned magnetic pump with leakage detection function that overcomes the shortcomings of the prior art.

Therefore, the canned magnetic 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, and the motor unit includes a rotor rotatable about the axis, an inner casing set on the outer side of the rotor, and an outer casing set on the outer side of the inner casing , And a stator surrounding the positioning seat and the outer casing and corresponding to the rotor. The inner casing has an inner surrounding wall surrounding the rotor, and one of the inner surrounding walls connected to the inner surrounding wall along the extending direction of the axis Side inner wall, and a flange wall connected to a side of the inner surrounding wall opposite to the inner side wall and extending in a direction away from the axis, the inner surrounding wall and the inner side wall jointly define a direction away from the axis The direction of the inner side wall is open for the accommodating space of the rotor. The outer casing has an outer surrounding wall surrounding the stator and the inner surrounding wall, and a connecting the outer surrounding wall and located on the inner side wall opposite to the inner wall. An outer side wall on one side of the accommodating space, and an extension wall connected to a side of the outer surrounding wall opposite to the outer side wall and extending in a direction away from the axis and located between the stator and the flange wall, the The leakage sensor is arranged on the outer shell, and includes a sensing module for sensing the change of the electrostatic capacitance between the outer side wall and the middle of the inner side wall and itself.

The effect of the present invention is that by setting the leakage sensor, the capacitance change between the outer side wall and the inner side wall and itself can be sensed, so that when the chemical liquid leaks, it can be instantaneous It is sensed to avoid subsequent damage.

Before the present invention is described in detail, it should be noted that in the following description, similar elements are denoted by the same numbers.

Referring to FIGS. 1, 2 and 3, a first embodiment of a canned magnetic pump with leak detection function of the present invention includes a base unit 2, a motor unit 3, and a leak detection sensor 4.

The base unit 2 includes a base 21, a positioning seat 22 surrounding an axis L, and a ring seat 23 disposed on the base 21 and sleeved on the positioning seat 22.

The motor unit 3 includes a rotor 31 rotatable about the axis L, an inner casing 32 set on the outside of the rotor 31, an outer casing 33 set on the outer side of the inner casing 32, and a surrounding Between the seat 22 and the outer shell 33 and corresponding to the stator 34 of the rotor 31, and a motor leakage prevention component 35.

The inner casing 32 has an inner surrounding wall 321 surrounding the rotor 31, an inner side wall 322 connected to one side of the inner surrounding wall 321 along the extending direction of the axis L, and an inner wall 322 connected to the inner surrounding wall 321 oppositely. A flange wall 323 extending away from the axis L on one side of the inner side wall 322, and an annular groove recessed around the axis L on the side of the flange wall 323 opposite to the inner side wall 322 324. The inner surrounding wall 321 and the inner side wall 322 jointly define an accommodating space 325 that opens along the axis L in a direction away from the inner side wall 322 for the rotor 31 to be disposed.

The outer shell 33 has an outer surrounding wall 331 surrounding the stator 34 and the inner surrounding wall 321, and an outer side wall connected to the outer surrounding wall 331 and located on the side of the inner side wall 322 opposite to the accommodating space 325 332. An extension wall 333 connected to the outer surrounding wall 331 opposite to the outer side wall 332 and extending in a direction away from the axis L and located between the stator 34 and the flange wall 323, and an extension wall 333 from the The outer side wall 332 extends in a direction opposite to the inner side wall 322 and surrounds an installation pipe wall 334 defining an installation space 335 for the leakage detection sensor 4. The installation pipe wall 334 has an internal thread portion 336 adjacent to the installation space 335.

The leak detection sensor 4 is disposed on the outer shell 33, and includes a sensing module 41 for sensing changes in the capacitance between the outer side wall 332 and the inner side wall 322 and itself, and a The sensor housing 42 is sleeved on the sensor module 41 and penetrated through the installation space 335. The sensor housing 42 has an outer thread portion 421 for screwing on the inner thread portion 336 . In this embodiment, the sensing module 41 is a capacitive proximity switch, which can be short-circuited or disconnected according to whether a certain degree of electrostatic capacitance is sensed.

The motor leakage prevention component 35 is installed in the ring groove 324 to keep the flange wall 323 and the extension wall 333 airtight. In this embodiment, the motor leakage prevention component 35 is an O-ring.

When the motor unit 3 is operating, the sensing module 41 can continuously sense the electrostatic capacitance change between the outer side wall 332 and the inner side wall 322 and itself on the outside of the outer side wall 332. Once the inner housing When 32 is damaged and the chemical liquid leaks between the outer side wall 332 and the inner side wall 322, due to the appearance of the chemical liquid, the electrostatic capacitance between the sensing module 41 and the chemical liquid changes. A controller (not shown) that is electrically connected to the sensing module 41 can issue an alarm or stop the operation of the motor unit 3, and further follow-up maintenance can be performed to prevent further leakage of chemical liquids. The stator 34 causes damage to the motor unit 3, and more importantly, it can avoid more serious work safety problems.

Referring to Figures 4, 5, and 6, a second embodiment of the present invention is similar to the first embodiment, and the difference lies in:

The outer shell 33 also has a through hole 337 located on the outer side wall 332 and communicating with the installation space 335.

The canned magnetic pump with leakage detection function further includes a sensor sealing unit 5, and the sensor sealing unit 5 includes a side wall of the sensor housing 42 penetrating into the installation space 335 and the outer side wall. The first sealing ring 51 between the parts 332 surrounding the through hole 337 and the second sealing ring 52 set on the sensor housing 42 to abut against the mounting pipe wall 334. In this embodiment, the first sealing ring 51 and the second sealing ring 52 are both an O-ring.

The sensor housing 42 also has a mounting ring surface 422 connected to the outer thread portion 421 opposite to the outer side wall 332 for the second sealing ring 52 to be sleeved.

When the inner shell 32 is damaged and the chemical liquid leaks between the outer side wall 332 and the inner side wall 322, and contacts the leakage sensor 4 through the perforation 337, the sensing module When the electrostatic capacity changes between 41 and the chemical liquid, an alarm can be issued through the controller or the operation of the motor unit 3 can be stopped.

The first sealing ring 51 can block the chemical liquid from leaking further out through the perforation 337, and the second sealing ring 52 acts as a second line of defense to seal the installation space 335, so even if the chemical liquid Part of the first sealing ring 51 oozing out will still be blocked by the second sealing ring 52, which can prevent damage caused by the chemical liquid oozing out.

In this way, the second embodiment can also achieve the same purpose and effect as the above-mentioned first embodiment.

In summary, by setting the leak detection sensor 4, the capacitance change between the middle of the outer side wall 332 and the inner side wall 322 and itself can be sensed, so when the chemical liquid leaks It can be sensed immediately to avoid subsequent damage, so 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.

2: base unit 21: Pedestal 22: positioning seat 23: Ring seat 3: Motor unit 31: Rotor 32: inner shell 321: Inner Surrounding Wall 322: inner wall 323: Flange Wall 324: ring groove 325: accommodation space 33: outer shell 331: Outer Surrounding Wall 332: Outer Wall 333: Extension Wall 334: Install the pipe wall 335: installation space 336: Internal thread 337: piercing 34: stator 35: Motor Leakproof Parts 4: Leak detection sensor 41: Sensing module 42: sensor housing 421: External Thread 422: Installation torus 5: Sensor sealing unit 51: The first sealing ring 52: second sealing ring 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 a first embodiment of a canned magnetic pump with leakage detection function of the present invention; Figure 2 is a schematic cross-sectional view of the first embodiment; Figure 3 is a partial enlarged view of Figure 2 4 is a perspective view of a second embodiment of the canned magnetic pump with leakage detection function of the present invention; Figure 5 is a schematic cross-sectional view of the second embodiment; and Fig. 6 is a partial enlarged view of Fig. 5.

2: base unit

21: Pedestal

22: positioning seat

23: Ring seat

3: Motor unit

31: Rotor

32: inner shell

321: Inner Surrounding Wall

322: inner wall

323: Flange Wall

324: ring groove

325: accommodating space

33: outer shell

331: Outer Surrounding Wall

332: Outer Wall

333: Extension Wall

34: stator

35: Motor Leakproof Parts

4: Leak detection sensor

L: axis

Claims (9)

A canned magnetic pump with leak detection function, including: A base unit, including a positioning seat surrounding an axis; A motor unit includes a rotor rotatable around the axis, an inner casing set on the outside of the rotor, an outer casing set on the outer side of the inner casing, and a surrounding the positioning seat and the outer casing Intermittently and corresponding to the stator of the rotor, the inner casing has an inner surrounding wall surrounding the rotor, an inner side wall connected to one side of the inner surrounding wall along the extending direction of the axis, and an inner wall connected to the inner surrounding wall The wall is opposite to the flange wall on the side of the inner side wall and extends in a direction away from the axis, and the inner surrounding wall and the inner side wall jointly define an opening along the axis in a direction away from the inner side wall for the rotor to be installed. An accommodating space, the outer shell having an outer surrounding wall surrounding the stator and the inner surrounding wall, 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, and an An extension wall connected to a side of the outer surrounding wall opposite to the outer side wall and extending in a direction away from the axis and located between the stator and the flange wall; and A leak detection sensor is arranged on the outer shell and includes a sensing module for sensing the change of the electrostatic capacitance between the outer side wall and the middle of the inner side wall and itself. The canned magnetic pump with a leak detection function according to claim 1, wherein the outer shell further has an outer wall extending from the outer side wall in a direction opposite to the inner side wall and surrounding and defining a leakage sensor The installation pipe wall of the installation space. The canned magnetic pump with leak detection function according to claim 2, wherein the installation pipe wall has an inner thread portion adjacent to the installation space, and the leak detection sensor further includes a set of The measuring module is penetrated in the sensor housing of the installation space, and the sensor housing has an outer thread part for screwing on the inner thread part. The canned magnetic pump with leak detection function according to claim 3, wherein the outer shell further has a through hole located on the outer side wall and communicating with the installation space. The canned magnetic pump with leak detection function according to claim 4, further comprising a sensor sealing unit, the sensor sealing unit including a sensor housing penetrating the side of the installation space and The outer side wall surrounds the first sealing ring between the perforated parts. According to claim 5, the canned magnetic pump with leakage detection function, wherein the sensor sealing unit further includes a second sealing ring set on the sensor housing to abut against the mounting pipe wall. The canned magnetic pump with leak detection function according to claim 6, wherein the sensor housing further has a side connected to the outer thread portion opposite to the outer side wall for the second sealing ring sleeve Set the installation ring surface. The canned magnetic pump with leak detection function according to claim 1, wherein the motor unit further includes a motor leak-proof component, and the inner housing further has a recessed part around the axis that is relatively adjacent to the flange wall In the annular groove on one side of the inner side wall, the motor leakage prevention component is installed in the annular groove to keep the flange wall and the extension wall airtight. The canned magnetic pump with leak detection function according to claim 1, wherein the base unit further includes a base, and a ring base disposed on the base and sleeved on the positioning base.

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