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

Abstract

A leak-proof canned magnetic pump with a rear cover shield, comprising a positioning seat, a motor unit, a rear cover shield and a leak-proof component, the motor unit is positioned relative to the positioning seat, and includes a casing, a stator and the rotor, the housing has a main cylinder part and a flange, the flange has a peripheral edge, the rear cover has a main body part and an extension disc part, the extension disc part and the flange airtightly abut By the way, the extension disk part has an outer ring edge, the outline range of the outer ring edge is larger than the outline range of the ring peripheral edge, and the leak-proof component is installed between the flange and the extension disk part. The service life of the motor unit can be prolonged by utilizing that the contour range of the outer ring edge is larger than the contour range of the ring peripheral edge, and the leak-proof component is installed between the flange and the extension disk portion. .

Description

Leak-proof canned magnetic pump with rear cover

technical field

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

Background technique

There is a magnetic drive pump (invention patent case No. I424661, Taiwan certificate number), which includes a front cover, a support frame, an impeller, a rear cover, an inner rotor, an outer rotor, a fixed shaft and A drag frame, the back cover is cup-shaped and has a two-layer shell structure, and has a back cover lining made of fluoroplastics and a reinforcement layer.

Although this kind of magnetic drive pump uses the back cover liner and the reinforcement layer to form a two-layer shell structure, since the edge contour range of the reinforcement layer is smaller than that of the back cover liner, when the back cover is used When the lining is cracked, the leaked chemical liquid will flow along the gap between the back cover lining and the reinforcing layer, and will be in contact with the back cover lining by the end edge of the reinforcing layer. Leaked to the outer rotor, the leaked chemical will corrode the outer rotor, resulting in damage to the motor.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a canned magnetic pump with a rear cover to prevent leakage, which can improve the leakage prevention effect.

The leak-proof canned magnetic pump with a rear cover shield of the present invention includes a positioning seat, a motor unit, a rear cover shield and a leak-proof component. The motor unit is positioned relative to the positioning seat and extends along an axis. It also includes a casing, a stator sleeved on the outside of the casing, and a rotor installed inside the casing. The main cylinder part is a flange arranged perpendicular to the axis, the main cylinder part and the flange together define a accommodating space which is arranged along the axis and is open in one direction, and the flange has a surrounding space. the circumference of the axis generated by the axis, the rotor is installed in the accommodating space, and the rear cover has a sleeve that is sleeved between the casing and the stator and covers the main cylinder part An external main body part, and an extension disc part connected to the main body part and arranged perpendicular to the axis, the extension disc part abutting against the flange airtightly, and the extension disc part having a space around the axis. The resulting outer ring has a contour range larger than that of the ring periphery, and the leak-proof component is installed between the flange and the extension disc.

In the leak-proof canned magnetic pump with a rear cover shield according to the present invention, the flange of the motor unit further has a disk end face facing the extended disk portion, a step groove recessed from the disk end face, and the step groove There is a large-diameter portion adjacent to the end face of the disk, and a small-diameter portion communicated with the large-diameter portion. The extension plate portion of the rear cover has an inner ring segment sleeved on the large diameter portion and abutting against the bottom surface of the groove, an outer ring segment surrounding the outside of the inner ring segment, and connected to the inner ring segment. The turning portion between the ring segment and the outer ring segment, the outer ring segment abuts against the end face of the disk, and the turning portion abuts against the groove peripheral surface.

In the leak-proof canned magnetic pump with a rear cover shield of the present invention, a ring groove surrounding the axis is recessed on the groove bottom surface of the flange of the motor unit, and the leak-proof component is installed in the ring groove , to keep the flange and the extension disc part airtight.

The leak-proof canned magnetic pump with a rear cover shield of the present invention further comprises a base sleeved on the positioning seat, and a sealing ring disposed between the base and the extension plate.

In the leak-proof canned magnetic pump with a rear cover shield according to the present invention, the base has a main disk member that is in the shape of a ring frame around the axis, and a side cover member connected to the main disk member along the axis. , the main disk member has a side end face for the outer ring segment to abut against, and a ring groove recessed by the side end face, the sealing ring is installed in the ring groove, so that the main disk member Airtightness is maintained with the extension disc portion.

The beneficial effect of the present invention is that: by utilizing the effect that the contour range of the outer ring edge is larger than the contour range of the ring peripheral edge, and the leak-proof component is installed between the flange and the extension plate, the It is ensured that the chemical liquid leaking between the casing and the rear cover can be effectively blocked, and the stator can be prevented from being corroded, and the service life of the motor unit can be prolonged.

Description of drawings

1 is a combined cross-sectional view of an embodiment of a canned magnetic pump with a leak-proof rear cover shield according to the present invention;

FIG. 2 is a schematic partial enlarged cross-sectional view of FIG. 1 .

Detailed ways

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

Referring to FIGS. 1 and 2, an embodiment of the leak-proof canned magnetic pump with a rear cover shield of the present invention includes a base 10, a positioning seat 20, a motor unit 30, a pump front cover 40, a rear Cover shroud 50 , a leak-proof assembly 60 , and a sealing ring 70 . The base 10 is made of a plastic material (this embodiment can be made of an engineering plastic material with acid and alkali resistance properties, such as PP, GFRPP (glass fiber reinforced polypropylene, glass fiber reinforced polypropylene), PVDF, CFRETFE (carbon fiber reinforced polypropylene) reinforced ethylene tetrafluoroethylene, carbon fiber reinforced ethylene-tetrafluoroethylene copolymer), etc.), and has a main disk member 11 around an axis L and in the shape of a ring frame, a side cover connected to the main disk member 11 along the axis L member 12 , and a support frame 13 locked at the bottom of the side cover member 12 . The main plate 11 has a side end surface 111 intersecting the axis L, and a ring groove 112 recessed by the side end surface 111 , and the sealing ring 70 is installed in the ring groove 112 .

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

The motor unit 30 includes a housing 31 positioned relative to the positioning seat 20 , a stator 32 sleeved between the housing 31 and the base 10 and the positioning seat 20 , a stator 32 mounted on the housing 31 The inner rotor 33 , an impeller 34 connected to the rotor 33 , and a mandrel 35 fixed to the housing 31 and used to support the rotor 33 . The housing 31 has a main cylindrical portion 311 for mounting the rotor 33 in a hollow cylindrical shape, and a flange 312 connected to the main cylindrical portion 311 and perpendicular to the axis L. The main cylindrical portion 311 is connected to the main cylindrical portion 311. The flanges 312 together define an accommodating space 313 which is arranged along the axis L and is open in one direction. The flange 312 has a ring periphery 314 generated around the axis L and a disc perpendicularly intersecting the ring periphery 314 The end face 315, a step groove 316 recessed by the disc end face 315, the step groove 316 has a large diameter portion 317 adjacent to the disc end face 315, and a small diameter portion 318 communicated with the large diameter portion 317, the The large-diameter portion 317 is composed of a groove bottom surface 317' and a groove peripheral surface 317" intersecting and connecting to the groove bottom surface 317'. The drain element 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 means of several screws 41 , and is covered outside the impeller 34 to provide axial positioning of the impeller 34 and support of the spindle 35 . Flange 312 is clamped by the pump front cover 40 and positioned relative to the base 10 .

The rear cover 50 can be made of plastic material (this embodiment can be made of engineering plastic material with acid and alkali resistance, such as PP, GFRPP, PVDF, CFRETFE, etc.), and has a sleeve sleeved on the shell 31 and the stator 32 and the main body part 51 covering the outside of the main cylinder part 311; An inner ring segment 521 sleeved on the large diameter portion 317 and abutting against the groove bottom surface 317', an outer ring segment 522 surrounding the inner ring segment 521, and an inner ring segment 521 connected to the outer ring The turning portion 523 between the segments 522 , and an outer ring rim 524 surrounding the axis L and disposed on the outer ring segment 522 . The outer ring segment 522 abuts against the disk end surface 315 , the turning portion 523 abuts against the groove peripheral surface 317 ″, and the contour range of the outer ring edge 524 is larger than that of the ring peripheral edge 314 . The extended disk portion 52 The leak-proof component 60 can abut against the flange 312 in an airtight manner, and the extension plate 52 can abut against the main plate 11 of the base 10 in an airtight manner via the sealing ring 70 .

In order to further understand the functions of the components of the present invention, the technical means used, and the expected effects, the following description will be given. It is believed that the present invention can be understood more deeply and specifically.

As shown in FIGS. 1 and 2 , when the whole assembly of the canned magnetic pump with the leak-proof rear cover of the present invention is completed, the front cover 40 of the pump is locked to the main plate of the base 10 by the screws 41 . 11, the extension plate 52 of the rear cover shield 50 is clamped between the pump front cover 40 and the main plate 11, and at the same time, the flange 312 of the housing 31 is clamped to the Between the pump front cover 40 and the extension plate 52 , in this way, the flange 312 of the housing 31 of the motor unit 30 is positioned relative to the base 10 and the positioning seat 20 , and the leak-proof component 60 is used. The sealing ring 70 is clamped between the flange 312 and the extension plate portion 52, and the sealing ring 70 is clamped between the extension plate portion 52 and the side end surface 111, so as to ensure that the pump front cover 40, the flange 312, the The joint between the extension plate 52 and the base 10 is air (water) tight and has a better anti-leakage effect.

When the canned magnetic pump is used for a period of time, the main cylinder portion 311 of the casing 31 which is often in contact with the chemical liquid is cracked, and the chemical liquid leaks into the space between the casing 31 and the rear cover 50 In the meantime, the arrangement of the rear cover shield 50 can prevent the leakage of chemical liquid to the stator 32, and the leakage prevention component 60 is also installed in the annular groove 319, so that the extension plate 52 is connected to the flange. Keep air (water) tight between 312, which can ensure the first anti-leakage.

In addition, the contour range of the outer ring edge 524 of the extended disk portion 52 is larger than the contour range of the peripheral edge 314 of the flange 312 to produce a second anti-leakage effect, and the extended disk portion 52 can pass through the sealing ring 70 . Airtightly abutting against the main plate 11 of the base 10 to produce the third anti-leakage function, even if the first anti-leakage structure fails, it can effectively prevent the chemical liquid from passing over the extension plate 52 and seeping out. It leaks into the stator 32, and therefore, the service life of the motor unit 30 can be extended.

Furthermore, by using the multi-turn structure of the step groove 316 of the flange 312 and the inner ring segment 521, the outer ring segment 522 and the turning part 523 of the extension disc part 52 to cooperate with each other, the flange 312 and the extension disc part can be combined with each other. The structure with multiple turns at the abutting part of 52 can also produce the effect of preventing leakage.

To sum up, the leak-proof canned magnetic pump with the rear cover of the present invention has a simple overall structure, is easy to manufacture and assemble, and can indeed achieve the purpose of the present invention.

Claims (5)

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.

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