JP7211639B2 - canned motor pump - Google Patents

Description

The present invention relates to canned motor pumps, and more particularly to canned motor pumps with leak sensing capability.

Patent Document 1 discloses a first shell portion that includes a base unit and a motor unit that is fixed inside the base unit and that defines an accommodation space in which a rotor of the motor unit is accommodated; a second shell having a second side wall covering a first side wall at the rear end of the shell from the outside facing the housing space, wherein the first side wall and the second side wall A canned motor pump is disclosed that is configured to define a sidewall and an intervening liquid collection space therebetween.

Taiwan Utility Model Registration No. M600801

Conventional canned motor pumps such as those described above are designed to prevent leakage between the first side wall and the second side wall even if the liquid transported by the canned motor pump leaks between the first shell and the second shell. The leakage of the liquid can be quickly confirmed by detecting the capacitance change between the liquid collecting space and itself by the sensing module of the leak detection sensor. effect is obtained.

However, in this configuration, if the amount of liquid leaking between the first shell and the second shell is small, it may not be detected because it is not well guided into the liquid collection space. there is room to do so.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a canned motor pump capable of more reliably detecting leakage of a liquid to be transported.

In order to achieve the above objects, the present invention provides a canned motor pump comprising motor means and holding means for surrounding and holding the motor means from the outside, wherein the motor means extends forward and backward along a predetermined axis. a rotor that rotates about the axis, a substantially cylindrical case body that surrounds and holds the rotor, and a flange that protrudes from the front end of the case body to the outside of the axis; a stator held and fixed by the holding means on the front end side of the rotor holding case; and an impeller mounted on the front end side of the rotor and driven to rotate by the rotor. and the canned motor pump further includes a motor cover interposed between the rotor holding case and the stator, the motor cover being positioned behind the flange portion of the rotor holding case. a ring-shaped contact ring portion that abuts on the side end surface; a tubular portion that extends rearward from the inner peripheral edge of the contact ring portion and wraps the outer side of the case main body portion of the rotor holding case; and a rear end of the tubular portion. a bottom covering the rear end so as not to open; an annular groove recessed in the inner end surface of the bottom facing the rotor holding case; and a recess in the inner end surface communicating with the annular groove. and an inner peripheral surface of the tubular portion facing the rotor holding case that is recessed so as to open toward the rotor holding case and communicates with the annular groove. a guide groove extending to an inner end face facing a case is formed in the outer end face not facing the rotor holding case of the bottom of the motor cover to sense a change in capacitance between the housing hole and itself. To provide a canned motor pump, characterized in that a leak detection sensor is arranged to detect a leak.

As described above, in the canned motor pump of the present invention, the motor cover includes an annular groove recessed in the inner end face facing the rotor holding case of the bottom, an accommodation hole communicating with the annular groove, and an annular groove communicating with the annular groove. A guide groove is formed extending from the inner peripheral surface of the tubular portion facing the rotor holding case to the inner end surface of the bottom portion facing the rotor holding case. Even if the amount of leaking liquid is small, since the guide groove and the annular groove are formed, by guiding this small amount of liquid to the accommodation hole, the accommodation hole and the leakage detection sensor can be connected. The occurrence of a liquid leak can be sensed from a change in the capacitance of the .

1 is an exploded perspective view showing the configuration of an embodiment of a canned motor pump of the present invention; FIG. 1 is a sectional view showing the configuration of an embodiment of a canned motor pump of the present invention; FIG. 1 is a perspective view showing a configuration of a motor cover in one embodiment of a canned motor pump of the present invention; FIG. FIG. 4 is a perspective view showing the configuration of the motor cover at a viewing angle different from that of FIG. 3; FIG. 3 is a cross-sectional view showing the configuration of a cross section taken along line VV in FIG. 2; 1 is an enlarged cross-sectional view of a main part showing the configuration of an embodiment of a canned motor pump of the present invention; FIG.

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a canned motor pump according to the present invention will be described below with reference to the drawings.

FIG. 1 is an exploded perspective view showing the configuration of one embodiment of the canned motor pump of the present invention, FIG. 2 is a sectional view showing the configuration of the same embodiment, and FIG. 3 is a motor cover of the same embodiment. FIG. 4 is a perspective view showing the structure of the motor cover at a different viewing angle from FIG. 3; FIG. 6 is an enlarged cross-sectional view of a main part showing the configuration of the same embodiment.

As shown in FIG. 1, the canned motor pump roughly comprises a motor means 30, a holding means 10 surrounding and holding the motor means 30 from the outside, a motor cover 40, and a leak detection sensor 50. .

As shown in FIGS. 2 and 6, the motor means 30 has a rotating shaft 35 extending in the longitudinal direction X along a predetermined axis L, a rotor 32 rotating about the axis L, and a rotor 32 A rotor holding case 31 formed to have a substantially cylindrical case main body portion 311 surrounding and holding the rotor holding case 31 and a flange portion 312 projecting from the front end portion of the case main body portion 311 to the outside of the axis L, and a rotor holding case A stator 33 held and fixed by the holding means 10 so as to be interposed between the case main body 311 of 31 and the holding means 10, and an impeller 34 attached to the front end side of the rotor 32 and rotationally driven by the rotor 32. and have

As shown in FIGS. 2 and 5, the holding means 10 includes a first holding frame 11 made of a plastic material that surrounds and holds the flange portion 312 of the rotor holding case 31 of the motor means 30, A second holding frame 12 made of a metal material which receives and holds the stator 33 and is held by the first holding frame 11, and a rotor holding case 31 of the motor means 30 disposed on the front end side of the motor means 30. and a front cover 13 attached to the first holding frame 11 so as to cover the flange portion 312 and the impeller 34 .

As a plastic material that can be used for the construction of the first holding frame 11, it is preferable to use a material with high chemical resistance, such as polypropylene, glass fiber reinforced polypropylene (GRFPP), polyvinylidene fluoride (PVDF), carbon fiber reinforced. ETFE (CFR-ETFE) and the like.

The second holding frame 12 made of metal material can be formed using, for example, an aluminum alloy.

In this embodiment, the rotor holding case 31 is fixed to the holding means 10 by engaging the flange portion 312 with the first holding frame 11, and the rear end of the substantially cylindrical case body portion 311 has a substantially A plate-shaped rotary shaft holding portion 313 is formed. The rotary shaft holding portion 313 is formed with a rotary bearing insertion hole 315 for receiving the rear end portion of the rotary shaft 35 and for rotatably holding the rear end portion of the rotary shaft 35 .

As shown in FIG. 2, the motor cover 40 is interposed between the rotor holding case 31 and the stator 33 of the motor means 30. As shown in FIG. Its specific shape is shown in FIGS. 3 and 4. FIG.

As shown in FIGS. 2 to 4, the motor cover 40 includes an annular contact ring portion 42 that contacts the rear end surface of the flange portion 312 of the rotor holding case 31, and an inner ring portion of the contact ring portion 42. It has a tubular portion 41 that extends rearward from the peripheral edge and wraps the outside of the case body portion 311 of the rotor holding case 31, and a bottom portion 44 that covers the rear end of the tubular portion 41 so that the rear end does not open. It is shaped like a cup. In addition, the bottom portion 44 of the motor cover 40 includes an annular portion 442 whose outer peripheral edge is in contact with the rear end of the tubular portion 41, and a central portion that protrudes rearward from the inner peripheral edge of the annular portion 442 and through which the axis L passes. and a projecting portion 445 . A recessed hole portion 432 corresponding to the central projecting portion 445 is formed in the inner end surface 43 of the bottom portion 44 of the motor cover 40 facing the rotor holding case 31 side.

Further, as shown in FIGS. 3 and 6, an annular groove 46 recessed in the inner end surface 43 of the bottom portion 44 facing the rotor holding case 31 side and the inner end surface communicating with the annular groove 46. 43, and the inner peripheral surface of the tubular portion 41 facing the rotor holding case 31, which is recessed so as to open toward the rotor holding case 31 and communicates with the annular groove 46. A guide groove 48 extending to the inner end face 43 facing the rotor holding case 31 side of 44 is formed. That is, in this embodiment, the guide groove 48 is formed on the first groove portion 481 extending on the inner peripheral surface of the tubular portion 41 facing the rotor holding case 31 and on the inner end surface 43 of the bottom portion 44 facing the rotor holding case 31 side. and an extending second groove 482 . In this embodiment, the receiving hole 47 and the guide groove 48 are formed so as to communicate with the recessed hole portion 432 .

A projection area 443 whose position corresponds to the housing hole 47 is formed on the outer end surface of the bottom portion 44 of the motor cover 40 that does not face the rotor holding case 31 , and the leak detection sensor 50 is attached to the projection area 443 . It is

In this embodiment, the leakage detection sensor 50 is a capacitive proximity switch that senses a change in capacitance between the housing hole 47 and itself.

In the canned motor pump of this embodiment, a motor cover 40 includes an annular groove 46 recessed in an inner end face 43 of a bottom portion 44 facing a rotor holding case 31, an accommodation hole 47 communicating with the annular groove 46, and an annular groove. A guide groove 48 extending from the inner peripheral surface of the tubular portion 41 facing the rotor holding case 31 to the inner end surface 43 of the bottom portion 44 facing the rotor holding case 31 is formed so as to communicate with 46. Even if the amount of liquid leaking between the rotor holding case 31 and the motor cover 40 is small, this small amount of liquid will flow through the guide groove 48 and the annular groove 46 because the guide groove 48 and the annular groove 46 are formed. Since it is guided to the accommodation hole 47 by the annular groove 46, the occurrence of the liquid leakage is detected from the change in capacitance between the accommodation hole 47 and the leakage detection sensor 50, and the leakage of the liquid is quickly confirmed. It is possible to prevent failure of other parts of the canned motor pump by early response such as replacement of parts.

Although the embodiments of the present invention have been described above, the present invention is not limited to these, and includes all modifications and equivalent configurations as various configurations included within the spirit and scope of the broadest interpretation. shall be

As described above, the canned motor pump of the present invention is capable of detecting the occurrence of liquid leakage even when the amount of liquid leaking between the rotor holding case and the motor cover is small, thus preventing failure. It is highly likely that it will be prevented from occurring.

10 holding means 11 first holding frame 12 second holding frame 13 front cover 30 motor means 31 rotor holding case 311 case main body 312 flange 313 rotating shaft holding portion 315 rotary bearing insertion hole 32 rotor 33 stator 34 impeller 35 Rotating shaft 40 Motor cover 41 Tubular portion 42 Abutment ring portion 43 Inner end surface 432 Recessed hole portion 44 Bottom portion 442 Annular portion 443 Protruding area 445 Central protruding portion 46 Annular groove 47 Accommodating hole 48 Guide groove 481 First groove portion 482 Second Groove 50 Leak sensor

Claims (3)

A canned motor pump comprising motor means and holding means surrounding and holding the motor means from the outside,
The motor means has a rotating shaft extending back and forth along a predetermined axis, and a rotor that rotates about the axis;
a rotor holding case formed to have a substantially cylindrical case main body that surrounds and holds the rotor, and a flange that projects from the front end of the case main body to the outside of the axis;
a stator held and fixed by the holding means so as to be interposed between the case main body portion of the rotor holding case and the holding means;
an impeller attached to the front end side of the rotor and rotationally driven by the rotor;
The canned motor pump further comprises a motor cover interposed between the rotor holding case and the stator,
The motor cover includes an annular abutment ring portion abutting the rear end surface of the flange portion of the rotor holding case, and an annular abutment ring portion extending rearward from an inner peripheral edge of the abutment ring portion to extend rearwardly from the case of the rotor holding case. It has a tubular portion that wraps around the outside of the main body, and a bottom portion that covers the rear end of the tubular portion so that the rear end of the tubular portion does not open. an annular groove; a housing hole recessed in the inner end face so as to communicate with the annular groove; and a tubular portion recessed so as to open toward the rotor holding case and communicate with the annular groove. a guide groove extending from an inner peripheral surface facing the rotor holding case to the inner end surface of the bottom portion;
A leakage detection sensor is arranged on the outer end surface of the bottom of the motor cover not facing the rotor holding case, and the leakage detection sensor detects changes in capacitance between the accommodation hole and the leakage detection sensor itself. A canned motor pump characterized by sensing a projecting area whose position corresponds to the housing hole is formed on an outer end surface of the bottom of the motor cover that does not face the rotor holding case,
2. The canned motor pump of claim 1, wherein the leak sensor is attached to the projection area. The bottom portion of the motor cover includes an annular portion whose outer peripheral edge is in contact with the rear end of the tubular portion, and a central projecting portion that projects rearward from the inner peripheral edge of the annular portion and through which the axis passes. , and
3. A recessed hole corresponding to said central protrusion is formed in said inner end surface of said bottom of said motor cover, and said housing hole and said guide groove communicate with said recessed hole. 3. The canned motor pump according to 2.

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