Canned magnetic pump for enhanced stability

Abstract

A canned magnetic pump capable of enhancing stability comprises a base, a positioning seat, a motor unit and a pump front cover, wherein the base comprises an inner ring surface, wherein at least a portion of the inner ring surface has a polygonal cross section perpendicular to the axis, wherein the positioning seat comprises an outer peripheral surface relative to the inner ring surface, wherein the outer peripheral surface has a polygonal cross section perpendicular to the axis, wherein the outer peripheral surface is non-rotatable relative to the inner ring surface, wherein the motor unit comprises a housing mounted on the base, a stator sleeved between the housing, the base and the positioning seat, a rotor mounted inside the housing, and an impeller connected to the rotor, wherein the pump front cover is mounted on the base and a cover is arranged outside the impeller. Thus, the positioning seat is non-rotatably nested inside the base, which can enhance the stability of the motor unit during startup and operation.

Description

Technical Field

[0001] The invention relates to a canned magnetic pump, in particular to a canned magnetic pump capable of enhancing stability. Background Art

[0002] There is a permanent magnet canned pump (Taiwan patent number TW I444536), which includes a pump front cover, a tripod, an impeller, a rear cover, a fixed shaft and a canned motor. The canned motor is composed of a stator, a motor rotor, a reinforcement frame, a middle frame and a rear frame. The bottom of the reinforcement frame is integrally formed with a fixed base; a radial annular rib is provided at the axial middle position of the inner diameter of the reinforcement frame, and a plurality of positioning blocks are provided on it; the annular rib divides the inner diameter space of the reinforcement frame into two sections, the front section space in the shape of a circular hole is used to tightly install the middle frame, and the rear section space is used to tightly install the rear frame. When the middle frame and the rear frame are locked and fitted together, the radial annular rib and the plurality of positioning blocks will be embedded in the card slot on the rear end face of the middle frame to ensure that the three can be combined into one, and ensure that the canned motor is firmly supported by the fixed base.

[0003] Although this permanent magnet canned pump can achieve the purpose of pumping the pump body, since the outer peripheral surface of the middle frame is circular and the front space of the reinforcement frame is also in the shape of a circular hole, the middle frame and the front space are tightly installed by tightening. Although the positioning block is embedded in the slot on the rear end surface of the middle frame, the middle frame and the reinforcement frame can be positioned in the circumferential direction. However, during assembly, it is difficult to align the slot and the positioning block, and it is also difficult to install accurately. In order to facilitate installation, a clearance may be retained between the slot and the positioning block. After assembly and when the motor is started, the vibration generated will cause the middle frame and the reinforcement frame to rotate relative to each other, resulting in poor stability of the middle frame and the reinforcement frame.

[0004] In addition, the fixing base is integrally formed at the bottom of the strengthening frame, which not only makes the overall volume of the strengthening frame larger, but also if the fixing base is damaged by foreign objects during transportation or use, the entire strengthening frame will be damaged and may not be able to achieve a stable locking effect. Summary of the invention

[0005] The object of the present invention is to provide a canned magnetic pump which can solve the existing deficiencies and enhance stability.

[0006] The canned magnetic pump with enhanced stability of the present invention comprises a base, a positioning seat, a motor unit and a pump front cover. The base is made of plastic material and is hollow cylindrical, and includes an inner annular surface surrounding an axis and defining a receiving hole, and at least a portion of the inner annular surface is polygonal in cross section perpendicular to the axis. The positioning seat is made of aluminum alloy and is hollow cylindrical, and is installed in the receiving hole of the base, and includes an outer peripheral surface relative to the inner annular surface, and the outer peripheral surface is polygonal in cross section perpendicular to the axis and the cross-sectional shape corresponds to the receiving hole, and the outer peripheral surface is non-rotatable relative to the inner annular surface. The motor unit includes a shell installed on the base, a stator sleeved between the shell and the base and the positioning seat, a rotor installed inside the shell, and an impeller connected to the rotor. The pump front cover is installed on the base, and a cover is arranged on the outside of the impeller.

[0007] The canned magnetic pump with enhanced stability of the present invention, the base also includes a first end face and a second end face opposite to the first end face along the axis, the inner annular surface is connected to the first end face and the second end face, the inner annular surface is stepped and has a first straight section intersecting and connected to the first end face, a first abutment intersecting and connected to the first straight section and substantially parallel to the first end face, a second straight section intersecting and connected to the first abutment and substantially parallel to the axis, a second abutment intersecting and connected to the second straight section and substantially parallel to the first end face, a third straight section intersecting and connected to the second abutment and substantially parallel to the axis, a third abutment intersecting and connected to the third straight section and substantially parallel to the first end face, and a fourth straight section intersecting and connected to the third abutment, the second end face intersects and is connected to the fourth straight section, the stator abuts against the first abutment, and the positioning seat abuts against the second abutment.

[0008] The canned magnetic pump with enhanced stability of the present invention has a third straight section of the inner annular surface of the base having an inner dovetail area and an inner polygonal area connected to the inner dovetail area, the inner polygonal area having a plurality of inner turning surface areas arranged at intervals around the axis, an inner corner area being formed between every two inner turning surface areas, and an outer peripheral surface of the positioning seat having an outer dovetail area and an outer polygonal area connected to the outer dovetail area, the outer polygonal area having a plurality of outer turning surface areas arranged at intervals around the axis, an outer corner area being formed between every two outer turning surface areas.

[0009] The canned magnetic pump with enhanced stability of the present invention, the fourth straight section of the inner annular surface of the base also has an inner dovetail area, and an inner polygonal area connected to the inner dovetail area, the inner polygonal area has a plurality of inner turning surface parts arranged at intervals around the axis, and an inner corner part is formed between every two inner turning surface parts.

[0010] The canned magnetic pump with enhanced stability of the present invention also includes a heat dissipation cover installed on the base, and several axial bolts. The heat dissipation cover is made of aluminum alloy and includes an inner side surface, an outer side surface opposite to the inner side surface along the axis, and several locking holes connecting the inner side surface and the outer side surface. The inner side surface abuts against the positioning seat and the third abutment portion. The second abutment portion of the base has several screw holes arranged at intervals around the axis. The positioning seat also includes a first side surface abutting against the second abutment portion, a second side surface opposite to the first side surface along the axis, and several through holes connecting the first side surface and the second side surface. The axial bolt is penetrated through the locking hole and the through hole and is screwed to the screw hole.

[0011] The canned magnetic pump with enhanced stability of the present invention further comprises a lower seat that is detachably locked to the base, and a plurality of locking screws that lock the lower seat to the base, wherein the lower seat is close to the inner dovetail area.

[0012] The canned magnetic pump with enhanced stability of the present invention, the base also includes a bottom end surface approaching the inner dovetail area, a recessed portion recessed in the bottom end surface, and a plurality of lower through holes arranged in the recessed portion, the lower seat has a base portion, a boss protruding from the base portion, and a plurality of through holes connected from the base portion to the boss, the positioning seat also has a plurality of lower screw holes arranged at the bottom, the locking screw is passed through the through hole and the lower through hole and is screwed in the lower screw hole.

[0013] The canned magnetic pump capable of enhancing stability of the present invention has a first abutment portion of the base having a plurality of recessed portions communicating with the accommodating hole, and a second abutment portion having a plurality of grooves communicating with the accommodating hole.

[0014] The beneficial effect of the present invention is that at least a portion of the inner annular surface of the base has a polygonal cross-section perpendicular to the axis, and the outer peripheral surface of the positioning seat has a polygonal cross-section perpendicular to the axis, so that the positioning seat is nested inside the base in a non-rotatable manner. Not only is the overall structure simple and easy to assemble, but the stability of the motor unit startup and operation can also be enhanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 is a three-dimensional diagram of an embodiment of a canned magnetic pump capable of enhancing stability according to the present invention;

[0016] Figure 2 is a three-dimensional exploded view of the base and the positioning seat of this embodiment;

[0017] Figure 3 is a combined cross-sectional view of this embodiment;

[0018] Figure 4 is along Figure 3 a sectional view taken along line IV-IV in FIG. 1 ; and

[0019] Figure 5 yes Figure 3 A partial enlarged schematic diagram of . DETAILED DESCRIPTION

[0020] The present invention is described in detail below with reference to the accompanying drawings and embodiments.

[0021] See also Figures 1 to 3 An embodiment of the canned magnetic pump with enhanced stability of the present invention includes a base 10, a positioning seat 20, a motor unit 30, a pump front cover 40, a heat dissipation cover 50, a lower seat 60, a plurality of axial bolts 70, and a plurality of locking screws 80.

[0022] The base 10 is made of a hollow cylindrical plastic material. In this embodiment, the base 10 can be made of an acid- and alkali-resistant engineering plastic material, such as polypropylene (PP), glass fiber reinforced polypropylene (GFRPP), polyvinylidene difluoride (PVDF), carbon fiber filled fluoroplastic resin (CFRFE). ETFE is Ethylene Tetra Fluoro The fluoroplastic resin is an abbreviation of Ethylene, and its Chinese name is ethylene-tetrafluoroethylene copolymer, commonly known as fluoroplastic resin), etc., and includes a main body 101, and a side cover 102 connected to the main body 101 along an axis L, a first end face 11 arranged on the main body 101, a second end face 12 opposite to the first end face 11 along the axis L and arranged on the side cover 102, and an inner annular surface 14 connected between the first end face 11 and the second end face 12 and surrounding the axis L and defining an accommodating hole 13. The inner annular surface 14 is stepped and has a first straight section 141 intersecting and connected to the first end face 11, a first abutment portion 142 intersecting and connected to the first straight section 141 and substantially parallel to the first end face 11, a second straight section 143 intersecting and connected to the first abutment portion 142 and substantially parallel to the axis L, a second abutment portion 144 intersecting and connected to the second straight section 143 and substantially parallel to the first end face 11, a third straight section 145 intersecting and connected to the second abutment portion 144 and substantially parallel to the axis L, a third abutment portion 145' intersecting and connected to the third straight section 145 and substantially parallel to the first end face 11, and a fourth straight section 145'' intersecting and connected to the third abutment portion 145', and the second end face 12 intersects and is connected to the fourth straight section 145'. The first abutting portion 142 has a plurality of recessed portions 142' communicating with the receiving hole 13, and the second abutting portion 144 has a plurality of screw holes 144' arranged around the axis L at intervals, and a plurality of grooves 144" communicating with the receiving hole 13. Figure 2 and Figure 4, at least a portion of the cross section of the inner annular surface 14 perpendicular to the axis L is polygonal, which means that the cross sections of the third straight section 145 and the fourth straight section 145" perpendicular to the axis L are both polygonal, and the third straight section 145 and the fourth straight section 145" both have an inner dovetail area 146 and an inner polygonal area 147 connected to the inner dovetail area 146, and the inner polygonal area 147 has seven inner turning surface parts 148 arranged at intervals around the axis L, and an inner corner part 149 is formed between every two inner turning surface parts 148. In addition, the base 10 also includes a bottom end surface 140 approaching the inner dovetail area 146, a recessed portion 140' recessed in the bottom end surface 140, and a plurality of lower through holes 140" arranged in the recessed portion 140'.

[0023] With reference Figure 2 and Figure 4 The positioning seat 20 is made of aluminum alloy and is hollow cylindrical. It is nested and installed in the accommodating hole 13 of the base 10 in a non-rotatable manner, and includes a first side surface 21 that abuts against the second abutting portion 144, a second side surface 22 opposite to the first side surface 21 along the axis L, an inner circumferential surface 23 connected between the first side surface 21 and the second side surface 22 and surrounding the axis L and defining an inner hole 231, an outer circumferential surface 24 opposite to the inner circumferential surface 23 and relative to the inner annular surface 14, a plurality of recessed grooves 25 recessed from the outer circumferential surface 24 toward the inner circumferential surface 23, a plurality of first heat dissipation fins 26, a plurality of through holes 27 connecting the first side surface 21 and the second side surface 22, and a plurality of lower screw holes 28 provided at the bottom, and a first heat dissipation fin 26 is generated between two adjacent recessed grooves 25. The cross-section of the outer peripheral surface 24 perpendicular to the axis L is polygonal and the cross-sectional shape corresponds to the accommodating hole 13. The outer peripheral surface 24 is non-rotatable relative to the inner annular surface 14. The outer peripheral surface 24 has an outer dovetail area 241 and an outer polygonal area 242 connected to the outer dovetail area 241. The outer polygonal area 242 has seven outer turning surface parts 243 arranged at intervals around the axis L, and an outer corner part 244 is formed between every two outer turning surface parts 243. The sink groove 25 and most of the first heat dissipation fins 26 are respectively arranged on the outer turning surface parts 243, and each outer corner part 244 is also provided with a first heat dissipation fin 26.

[0024] The motor unit 30 includes a housing 31 mounted on the base 10, a stator 32 sleeved between the housing 31, the base 10 and the positioning seat 20, a rotor 33 mounted inside the housing 31, and an impeller 34 connected to the rotor 33. One end surface of the stator 32 abuts against the first abutting portion 142, and the outer peripheral surface abuts against the second straight section 143 and the inner peripheral surface 23. The detailed structure and operating principle of the motor unit 30 are irrelevant to the technical problem to be solved by the present invention and are not the focus of the present invention, so they are not explained in detail.

[0025] The pump front cover 40 is fixed to the first end surface 11 of the base 10 by a plurality of screws and covers the outside of the impeller 34. The pump front cover 40 has an inlet 41 arranged along the axis L, and an outlet 42 arranged on one side of the inlet 41 and corresponding to one of the tangent lines of the impeller 34 (not shown).

[0026] The heat dissipation cover 50 is installed on the base 10. The heat dissipation cover 50 is made of aluminum alloy and includes an inner side surface 51, an outer side surface 52 opposite to the inner side surface 51 along the axis L, a plurality of second heat dissipation fins 53 protruding from the outer side surface 52, and a plurality of locking holes 54 connecting the inner side surface 51 and the outer side surface 52. The inner side surface 51 abuts against the third abutting portion 145' and the second side surface 22 of the positioning seat 20, and also abuts against the other end surface of the stator 32. The heat dissipation cover 50 corresponds to the fourth straight section 145" and is shielded by the side cover 102.

[0027] The lower seat 60 is detachably locked to the bottom of the base 10 and close to the inner dovetail area 146. The lower seat 60 has a base portion 61, a boss 62 protruding from the base portion 61 and embedded in the recessed portion 140', and a plurality of through holes 63 connecting the base portion 61 to the boss 62.

[0028] The axial bolt 70 passes through the locking hole 54 and the through hole 27 and is screwed into the screw hole 144 ′.

[0029] The locking screws 80 are respectively passed through the through holes 63 and the lower through holes 140 ″ and screwed into the lower screw holes 28 , thereby locking the lower seat 60 to the base 10 and the positioning seat 20 to the base 10 .

[0030] In order to further understand the effects of the various components of the present invention, the technical means used, and the expected effects to be achieved, the following description will be given. It is believed that this will provide a deeper and more specific understanding of the present invention.

[0031] like Figure 3 , Figure 4 and Figure 5When the canned magnetic pump is assembled, the positioning seat 20 is disposed outside the stator 32, and the base 10 is also disposed outside the positioning seat 20. The heat dissipation cover 50 also abuts against one side of the stator 32 and the positioning seat 20.

[0032] When the stator 32 of the motor unit 30 is powered, the rotor 33 can be driven to rotate, and the rotor 33 synchronously drives the impeller 34 to rotate, so that the liquid introduced from the inlet 41 on the front side of the pump front cover 40 is pumped toward the outlet 42 by the impeller 34, and the purpose of pumping the liquid is achieved.

[0033] By utilizing the fact that the cross section of the third straight section 145 of the base 10 perpendicular to the axis L is polygonal (the third straight section 145 has the inner dovetail area 146 and the inner polygonal area 147), and the cross section of the outer peripheral surface 24 of the positioning seat 20 perpendicular to the axis L is polygonal (the outer peripheral surface 24 has the outer dovetail area 241 and the outer polygonal area 242), when the positioning seat 20 is to be embedded in the accommodating hole 13, it can be fool-proof and easily aligned. After the positioning seat 20 is embedded in the accommodating hole 13, the positioning seat 20 can be positioned in the base 10 without rotation, and the axial bolt 70 is passed through the locking hole 54, the through hole 27 and is screwed to the screw hole 144', so that the positioning seat 20 is stably fixed along the axial direction between the base 10 and the heat dissipation cover 50, which can enhance the stability of the start-up and operation of the motor unit 30.

[0034] The locking screw 80 is passed through the through hole 63 and the lower through hole 140" and is screwed into the lower screw hole 28, so that the lower seat 60 can be removably locked to the bottom of the base 10. The lower seat 60 and the base 10 can be repaired and replaced separately. Even if the lower seat 60 is damaged by foreign objects during transportation or use, only the lower seat 60 needs to be replaced.

[0035] In addition, the motor unit 30 generates heat energy during operation, and when the heat energy is transferred from the stator 32 to the positioning seat 20, the positioning seat 20 has a larger heat dissipation area due to the setting of the first heat dissipation fins 26, and can produce a better heat dissipation effect. The heat energy dissipated by the first heat dissipation fins 26 and the sink 25 is then transferred to the heat dissipation cover 50, and then the second heat dissipation fins 53 produce a heat dissipation effect to the outside, which can extend the service life of the motor unit 30.

[0036] In addition, the positioning seat 20 is provided with the recessed groove 25 on the outer peripheral surface 24, which not only produces the first heat dissipation fins 26, but also has the effect of saving raw materials and reducing the positioning seat 20 and the overall weight. The first abutment portion 142 of the base 10 is provided with the recessed recess 142', and the second abutment portion 144 is provided with the groove 144", which also has the effect of saving raw materials and reducing the overall weight. Although the thickness between the first end surface 11 of the base 10 and the first abutment portion 142 is relatively large, the setting of the recessed recess 142' can reduce the deformation during the molding and cooling process of the base 10.

[0037] In summary, the canned magnetic pump of the present invention can enhance stability, has a simple overall structure, is easy to manufacture and assemble, and can achieve a stable operation effect, thereby truly achieving the purpose of the present invention.

Claims

1. A canned magnetic pump capable of enhancing stability, comprising a base, a positioning seat, a motor unit and a pump front cover, characterized in that: The base is made of plastic material and is hollow cylindrical, and includes an inner annular surface surrounding the axis and defining the receiving hole, and at least a part of the inner annular surface is in a polygonal cross section perpendicular to the axis; The positioning seat is made of aluminum alloy and is hollow cylindrical, and is installed in the receiving hole of the base, and includes an outer peripheral surface relative to the inner annular surface, the cross section of the outer peripheral surface perpendicular to the axis is polygonal and the cross-sectional shape corresponds to the receiving hole, and the outer peripheral surface is non-rotatable relative to the inner annular surface; The motor unit comprises a housing mounted on the base, a stator sleeved between the housing, the base and the positioning seat, a rotor mounted inside the housing, and an impeller connected to the rotor; The pump front cover is mounted on the base and covers the outside of the impeller; The base also includes a first end face and a second end face opposite to the first end face along the axis, the inner annular surface is connected to the first end face and the second end face, the inner annular surface is stepped and has a first straight section intersecting and connected to the first end face, a first abutment portion intersecting and connected to the first straight section and substantially parallel to the first end face, a second straight section intersecting and connected to the first abutment portion and substantially parallel to the axis, a second abutment portion intersecting and connected to the second straight section and substantially parallel to the first end face, a third straight section intersecting and connected to the second abutment portion and substantially parallel to the axis, a third abutment portion intersecting and connected to the third straight section and substantially parallel to the first end face, and a fourth straight section intersecting and connected to the third abutment portion, the second end face intersecting and connected to the fourth straight section, the stator abuts against the first abutment portion, and the positioning seat abuts against the second abutment portion.

2. The canned magnetic pump with enhanced stability according to claim 1, characterized in that: The third straight section of the inner annular surface of the base has an inner dovetail area and an inner polygonal area connected to the inner dovetail area, the inner polygonal area has a plurality of inner turning surface areas arranged at intervals around the axis, and an inner corner is formed between every two inner turning surface areas, the outer peripheral surface of the positioning seat has an outer dovetail area and an outer polygonal area connected to the outer dovetail area, the outer polygonal area has a plurality of outer turning surface areas arranged at intervals around the axis, and an outer corner is formed between every two outer turning surface areas.

3. The canned magnetic pump with enhanced stability according to claim 2, characterized in that: The fourth straight section of the inner annular surface of the base also has an inner dovetail area and an inner polygonal area connected to the inner dovetail area. The inner polygonal area has several inner turning surface parts arranged at intervals around the axis, and an inner corner part is formed between every two inner turning surface parts.

4. The canned magnetic pump with enhanced stability according to claim 1, characterized in that: It also includes a heat dissipation cover installed on the base and several axial bolts. The heat dissipation cover is made of aluminum alloy and includes an inner side surface, an outer side surface opposite to the inner side surface along the axis, and several locking holes connecting the inner side surface and the outer side surface. The inner side surface abuts against the positioning seat and the third abutment portion. The second abutment portion of the base has several screw holes arranged at intervals around the axis. The positioning seat also includes a first side surface abutting against the second abutment portion, a second side surface opposite to the first side surface along the axis, and several through holes connecting the first side surface and the second side surface. The axial bolt is penetrated through the locking hole and the through hole and is screwed to the screw hole.

5. The canned magnetic pump capable of enhancing stability according to claim 2, characterized in that: It also includes a lower seat that is detachably locked to the base, and a plurality of locking screws that lock the lower seat to the base, and the lower seat is close to the inner dovetail area.

6. The canned magnetic pump capable of enhancing stability according to claim 5, characterized in that: The base also includes a bottom end surface approaching the inner dovetail area, a recessed portion recessed in the bottom end surface, and a plurality of lower through holes arranged in the recessed portion. The lower seat has a base portion, a boss protruding from the base portion, and a plurality of through holes connected from the base portion to the boss. The positioning seat also has a plurality of lower screw holes arranged at the bottom. The locking screw is passed through the through hole and the lower through hole and is screwed in the lower screw hole.

7. The canned magnetic pump capable of enhancing stability according to claim 1, characterized in that: The first abutting portion of the base has a plurality of recessed portions communicated with the accommodating hole, and the second abutting portion has a plurality of grooves communicated with the accommodating hole.

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