CN111255700A

CN111255700A - Canned magnetic pump with rear cover shield for preventing leakage

Info

Publication number: CN111255700A
Application number: CN202010189465.1A
Authority: CN
Inventors: 黄丁财
Original assignee: Zi Yi Electrical Engineering Co Ltd
Current assignee: Zi Yi Electrical Engineering Co Ltd
Priority date: 2020-03-18
Filing date: 2020-03-18
Publication date: 2020-06-09

Abstract

A canned magnetic pump with a rear cover shield for preventing leakage comprises a positioning seat, a motor unit, the rear cover shield and a leakage-proof assembly, wherein the motor unit is positioned relative to the positioning seat and comprises a shell, a stator and a rotor, the shell is provided with a main cylinder part and a flange, the flange is provided with a ring periphery, the rear cover shield is provided with a main body part and an extension disc part, the extension disc part is in airtight abutting joint with the flange, the extension disc part is provided with an outer ring edge, the outline range of the outer ring edge is larger than that of the ring periphery, and the leakage-proof assembly is installed between the flange and the extension disc part. The service life of the motor unit can be prolonged by the fact that the outline range of the outer ring edge is larger than that of the ring peripheral edge, and the leakage-proof assembly is mounted between the flange and the extension disc part.

Description

Canned magnetic pump with rear cover shield for preventing leakage

Technical Field

The invention relates to a pump of a chemical filter, in particular to a canned magnetic pump with a back cover shield for leakage prevention.

Background

A conventional magnetic drive pump (taiwan certificate No. I424661 patent of the present invention) includes a front cover, a supporting frame, an impeller, a rear cover, an inner rotor, an outer rotor, a fixed shaft and a bracket, wherein the rear cover is cup-shaped and has a two-layer shell structure, and has a rear cover liner made of fluoroplastic, and a reinforcing layer.

Although the magnetic driving pump uses the rear cover liner and the reinforcing layer to form a two-layer shell structure, because the outline range of the end edge of the reinforcing layer is smaller than the outline range of the rear cover liner, when the rear cover liner is cracked, leaked chemical liquid can flow along the gap between the rear cover liner and the reinforcing layer, and can leak to the outer rotor from the abutting part of the end edge of the reinforcing layer and the rear cover liner, and the leaked chemical liquid can corrode the outer rotor, thereby causing damage to the motor.

Disclosure of Invention

The invention aims to provide a canned magnetic pump with a rear cover shield and leakage prevention, which can improve the leakage prevention effect.

The invention relates to a canned magnetic pump with a rear cover shield for leakage prevention, which comprises a positioning seat, a motor unit, the rear cover shield and a leakage prevention assembly, wherein the motor unit is positioned relative to the positioning seat and extends along an axis, and comprises a shell, a stator sleeved outside the shell, and a rotor arranged inside the shell, the shell is provided with a main cylinder part which is used for installing the rotor and is in a hollow cylinder shape, and a flange which is connected with the main cylinder part and is arranged perpendicular to the axis, the main cylinder part and the flange jointly define an accommodating space which is arranged along the axis and is opened in a one-way direction, the flange is provided with a ring periphery which is generated around the axis, the rotor is arranged in the accommodating space, the rear cover shield is provided with a main body part which is sleeved between the shell and the stator and is wrapped outside the main cylinder part, and an extending disc part which is connected with the main body part and is arranged perpendicular to the axis, the extension disc part is in airtight abutting contact with the flange, the extension disc part is provided with an outer ring edge generated around the axis, the outline range of the outer ring edge is larger than that of the ring periphery, and the leakage-proof assembly is installed between the flange and the extension disc part.

The invention discloses a canned magnetic pump with a rear cover shield for leakage prevention, wherein a flange of a motor unit is also provided with a disc end face facing an extension disc part, a stepped groove formed by the disc end face in a concave mode, the stepped groove is provided with a large diameter part adjacent to the disc end face and a small diameter part communicated with the large diameter part, the large diameter part is formed by a groove bottom face and a groove peripheral face connected to the groove bottom face in an intersecting mode, the extension disc part of the rear cover shield is provided with an inner ring section sleeved on the large diameter part and abutted against the groove bottom face, an outer ring section surrounding the outer part of the inner ring section and a turning part connected between the inner ring section and the outer ring section, the outer ring section is abutted against the disc end face, and the turning part is abutted against the groove peripheral face.

The canned magnetic pump with the rear cover shield for leakage prevention is characterized in that a ring groove surrounding the axis is concavely arranged on the bottom surface of a flange of the motor unit, and the leakage prevention assembly is arranged in the ring groove to ensure that the flange and the extension disc part are kept airtight.

The invention discloses a canned magnetic pump with a rear cover shield for leakage prevention, which also comprises a base sleeved on the positioning seat and a sealing ring arranged between the base and the extension disc part.

The canned magnetic pump with the rear cover shield for leakage prevention is characterized in that the base is provided with a main disc part which is in a ring frame shape around the axis and a side cover part which is connected to the main disc part along the axis, the main disc part is provided with a side end surface against which the outer ring section abuts and a ring groove which is concavely arranged from the side end surface, and the sealing ring is arranged in the ring groove so that air tightness is kept between the main disc part and the extension disc part.

The invention has the beneficial effects that: by utilizing the effect that the outline range of the outer ring edge is larger than the outline range of the ring edge, and the leakage-proof assembly is arranged between the flange and the extension disc part, chemical liquid leaked between the shell and the rear cover shield can be effectively prevented, the corrosion to the stator can be avoided, and the service life of the motor unit can be prolonged.

Drawings

FIG. 1 is an assembled cross-sectional view of one embodiment of the present invention back cover shield leak proof canned magnetic pump;

fig. 2 is a partially enlarged cross-sectional view of fig. 1.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and examples.

Referring to fig. 1 and 2, an embodiment of the canned magnetic pump with rear cover shield leakage prevention of the present invention comprises a base 10, a positioning seat 20, a motor unit 30, a pump front cover 40, a rear cover shield 50, a leakage prevention assembly 60, and a sealing ring 70. The base 10 is made of a plastic material (in this embodiment, an engineering plastic material with acid and alkali resistance may be selected to be made of, for example, PP, GFRPP (glass fiber reinforced polypropylene), PVDF, CFRETFE (carbon fiber reinforced ethylene-tetrafluoroethylene copolymer), etc.), and has a main disk 11 surrounding an axis L and having a ring frame shape, a side cover 12 connected to the main disk 11 along the axis L, and a support frame 13 locked at the bottom of the side cover 12. The main disc 11 has a side end surface 111 intersecting the axis L, and a ring groove 112 recessed from the side end surface 111, and the seal ring 70 is installed in the ring groove 112.

The positioning seat 20 is made of metal material and is made into a hollow cylinder shape, and is nested and installed inside the base 10 corresponding to the side cover 12.

The motor unit 30 includes a housing 31 positioned with respect to the positioning seat 20, a stator 32 sleeved between the housing 31 and the base 10 and the positioning seat 20, a rotor 33 installed inside the housing 31, an impeller 34 connected to the rotor 33, and a spindle 35 fixed to the housing 31 and used for supporting the rotor 33. The housing 31 has a main cylindrical portion 311 having a hollow cylindrical shape and to which the rotor 33 is attached, and a flange 312 connected to the main cylindrical portion 311 and disposed perpendicularly to the axis L, the main cylinder 311 and the flange 312 define a receiving space 313 along the axis L and opened in one direction, the flange 312 has a circumferential edge 314 produced about the axis L, a disk end face 315 perpendicularly intersecting the circumferential edge 314, a stepped groove 316 recessed from the disk end face 315, the stepped groove 316 has a large diameter portion 317 adjacent to the disc end face 315, and a small diameter portion 318 communicating with the large diameter portion 317, the large diameter portion 317 is formed by a groove bottom surface 317 'and a groove peripheral surface 317 ″ connected to the groove bottom surface 317' in an intersecting manner, the groove bottom surface 317' is recessed with an annular groove 319 around the axis L, and the leakage preventing member 60 is installed in the annular groove 319.

The pump front cover 40 is fastened to the side end surface 111 of the base 10 by a plurality of screws 41, and covers the impeller 34, and provides axial positioning of the impeller 34 and support for the spindle 35, and the flange 312 is clamped by the pump front cover 40 and is positioned relative to the base 10.

The rear cover shield 50 can be made of a plastic material (in this embodiment, an engineering plastic material with acid and alkali resistance can be selected for manufacturing, such as PP, GFRPP, PVDF, cfrefe, etc.), and has a main body portion 51 sleeved between the housing 31 and the stator 32 and covering the outside of the main cylinder portion 311, and an extension disc portion 52 connected to the main body portion 51 and disposed perpendicular to the axis L, where the extension disc portion 52 has an inner ring segment 521 sleeved on the large diameter portion 317 and abutted against the tank bottom surface 317', an outer ring segment 522 surrounding the outside of the inner ring segment 521, a turning portion 523 engaged between the inner ring segment 521 and the outer ring segment 522, and an outer ring edge 524 surrounding the axis L and disposed on the outer ring segment 522. The outer ring section 522 abuts against the disk end surface 315, the turning part 523 abuts against the groove peripheral surface 317 ", and the profile range of the outer ring edge 524 is greater than the profile range of the ring peripheral edge 314. The extension disc 52 can be air tightly abutted against the flange 312 through the leakage preventing member 60, and the extension disc 52 can be air tightly abutted against the main disc member 11 of the base 10 through the seal ring 70.

For a further understanding of the invention, its role, the technical means employed, and the efficacy attained by its cooperation, it is believed that the invention will be more fully and specifically understood from the following description.

As shown in fig. 1 and 2, when the canned magnetic pump with the rear cover shield for preventing leakage is integrally assembled, when the pump front cover 40 is fastened to the main disc 11 of the base 10 by the screws 41, the extension disc 52 of the rear cover shield 50 is clamped between the pump front cover 40 and the main disc 11, at the same time, the flange 312 of the housing 31 is clamped between the pump front cover 40 and the extension disc portion 52, so that, the flange 312 of the housing 31 of the motor unit 30 is positioned with respect to the base 10 and the positioning socket 20, the leak-proof assembly 60 is clamped between the flange 312 and the extension disc 52, and the seal ring 70 is clamped between the extension disc 52 and the side end surface 111, so as to ensure that the pump front cover 40, the flange 312 and the extension disc 52, and the joint of the base 10 generates air (water) tightness and generates better anti-leakage effect.

When the canned magnetic pump is used for a period of time, even if the main cylinder 311 of the housing 31, which is often in contact with the chemical liquid, is cracked and the chemical liquid leaks between the housing 31 and the rear cover shield 50, the chemical liquid can be prevented from leaking to the stator 32 by the rear cover shield 50, and the leakage-proof assembly 60 is also installed in the annular groove 319, so that air (water) tightness is maintained between the extension disc part 52 and the flange 312, and the first leakage-proof can be ensured.

The outer rim 524 of the extension disc 52 has a larger contour than the peripheral rim 314 of the flange 312 to provide a second leakage-proof function, and the extension disc 52 can be abutted against the main disc 11 of the base 10 through the sealing ring 70 to provide a third leakage-proof function, so that even if the first leakage-proof structure fails, the chemical liquid can be effectively prevented from leaking into the stator 32 beyond the extension disc 52, thereby prolonging the service life of the motor unit 30.

Furthermore, by using the multi-turn structure of the stepped groove 316 of the flange 312 and the inner ring 521, the outer ring 522 and the turn portion 523 of the extension disc portion 52 to cooperate with each other, a multi-turn structure can be generated at the abutting position of the flange 312 and the extension disc portion 52, and a leakage-blocking effect can also be generated.

In summary, the canned magnetic pump with the rear cover shield for leakage prevention of the invention has the advantages of simple overall structure, easy manufacture and assembly, and can really achieve the purpose of the invention.

Claims

1. The utility model provides a canned magnetic drive pump of lid guard shield leak protection behind utensil, contains positioning seat, motor unit, back lid guard shield and leak protection subassembly, its characterized in that:

the motor unit is positioned relative to the positioning seat and extends along an axis, and comprises a shell, a stator sleeved outside the shell, and a rotor arranged inside the shell, wherein the shell is provided with a main cylinder part which is used for installing the rotor and is in a hollow cylinder shape, and a flange which is connected with the main cylinder part and is perpendicular to the axis, the main cylinder part and the flange jointly define an accommodating space which is arranged along the axis and is opened in a single direction, the flange is provided with a ring periphery generated around the axis, and the rotor is arranged in the accommodating space;

the rear cover shield is provided with a main body part which is sleeved between the shell and the stator and covers the outside of the main cylinder part, and an extending disc part which is connected with the main body part and is arranged perpendicular to the axis, the extending disc part is in airtight abutting joint with the flange, the extending disc part is provided with an outer ring edge which is generated around the axis, and the outline range of the outer ring edge is larger than that of the ring edge;

the leakage-proof assembly is arranged between the flange and the extension disc part.

2. The leak resistant canned magnetic pump with back cover shield of claim 1, characterized in that: the flange of motor unit still has the orientation extend the dish terminal surface of dish portion, by the recessed step groove of establishing of dish terminal surface, the step groove have adjacent to the major diameter portion of dish terminal surface, and communicate in the minor diameter portion of major diameter portion, the major diameter portion by the tank bottom surface, and crossing connect in the groove of tank bottom surface is global constitutes jointly, the extension dish portion of back lid guard shield has the cover to be located the major diameter portion just support by in the interior ring section of tank bottom surface, around in the outside outer ring section of interior ring section, and link up in interior ring section with turn portion between the outer ring section, outer ring section support by in the dish terminal surface, turn portion support by in the groove is global.

3. The leak resistant canned magnetic pump with back cover shield of claim 2, characterized in that: the bottom surface of the groove of the flange of the motor unit is concavely provided with an annular groove surrounding the axis, and the leakage-proof assembly is arranged in the annular groove to ensure that the air tightness is kept between the flange and the extension disc part.

4. The leak resistant canned magnetic pump with back cover shield of claim 3, characterized in that: the sealing ring is arranged between the base and the extension disc part.

5. The leak resistant canned magnetic pump with back cover shield of claim 4, characterized in that: the base has around the axis is the main dish spare of ring frame form, and follows the axis connect in the side cover spare of main dish spare, main dish spare has the confession the side end face that the outer loop section leaned on, and by the annular that the side end face was set up in the recess, the sealing ring install in the annular, make main dish spare with keep airtight between the extension dish part.