TWI716237B - Leak-proof canned magnetic pump with back cover - Google Patents

Abstract

A leak-proof canned magnetic pump with a back cover includes a positioning seat, a motor unit, a back cover and a leak-proof element. The motor unit is positioned relative to the positioning base, and includes a housing, a stator, and a rotor. The housing has a main cylinder and a flange. The flange has a circumferential edge. The rear cover has a The main body portion and an extension disk portion, the extension disk portion abuts against the flange in an airtight manner, the extension disk portion has an outer ring edge whose contour range is greater than the contour range of the ring periphery, the leakage prevention element Installed between the flange and the extension plate. Utilizing the contour range of the outer ring edge greater than the contour range of the ring peripheral edge and the function of the leak-proof element being installed between the flange and the extension disc portion, the service life of the motor unit can be prolonged.

Description

Leak-proof canned magnetic pump with back cover

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

There is a magnetic drive pump (Taiwan Certificate No. 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 trailer. 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 back cover When the cover lining is cracked, the leaked chemical liquid will spread along the gap between the back cover lining and the strengthening layer, and will abut the back cover lining from the edge of the strengthening layer The leaked chemical solution will corrode the outer rotor and cause damage to the motor.

Therefore, the purpose of the present invention is to provide a leak-proof canned magnetic pump with a back cover that can improve the leak-proof effect.

Therefore, the canned magnetic pump with a rear cover protective cover of the present invention includes a positioning seat, a motor unit, a rear cover protective cover and a leakproof element. The motor unit is positioned relative to the positioning base, extends along an axis, and includes a housing, a stator set outside the housing, and a rotor installed inside the housing, the housing having a The main cylinder part of the hollow cylinder for the rotor installation, and a flange connected to the main cylinder part and arranged perpendicular to the axis, the main cylinder part and the flange together define a hollow cylinder A one-way open accommodating space, the flange has a circumferential edge formed around the axis, the rotor is installed in the accommodating space, and the rear cover has a sleeve set between the housing and the stator And a main body part wrapped around the main cylinder part, and an extension disc part connected to the main part and arranged perpendicular to the axis, the extension disc part abuts against the flange in an airtight manner, the extension disc part has a The outer circumferential edge formed around the axis has a contour range larger than that of the circumferential edge of the ring, and the leak-proof element is installed between the flange and the extending disc portion.

The effect of the present invention is to utilize 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 element is installed between the flange and the extension disc portion to ensure leakage to the shell The chemical liquid between the body and the rear cover shield can be effectively blocked, and corrosion of the stator can be avoided, and the service life of the motor unit can be prolonged.

10: Pedestal

L: axis

11: Main disk

111: side end face

112: ring groove

12: Side cover

13: Support frame

20: positioning seat

30: Motor unit

31: Shell

311: main tube

312: Flange

313: housing space

314: Ring

315: Disc end face

316: Class Slot

317: Large Diameter

317’: the bottom of the groove

317": groove circumference

318: Small Diameter

319: ring groove

32: stator

33: Rotor

34: impeller

35: Mandrel

40: Pump front cover

41: Screw

50: Rear cover guard

51: main body

52: Extension plate

521: inner ring segment

522: Outer Ring

523: Turn

524: Outer Ring

60: Leakproof element

70: sealing ring

The other features and effects of the present invention will be described in the embodiment with reference to the drawings 1 is a combined cross-sectional view of an embodiment of the leak-proof canned magnetic pump with a back cover of the present invention; and FIG. 2 is a partial enlarged cross-sectional view of FIG. 1.

1 and 2, an embodiment of a canned magnetic pump with a rear cover shield of the present invention for preventing leakage, includes a base 10, a positioning seat 20, a motor unit 30, a pump front cover 40, and a rear The cover shield 50, an anti-leakage element 60, and a sealing ring 70.

The base 10 is 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 ring-shaped frame around an axis L The main plate 11, a side cover 12 connected to the main plate 11 along the axis L, and a support frame 13 locked to the bottom of the side cover 12. The main plate 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 sealing ring 70 is installed in the ring groove 112.

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

The motor unit 30 includes a housing 31 that is positioned relative to the positioning base 20, a stator 32 set between the housing 31 and the base 10 and the positioning base 20, and a stator 32 mounted on the housing 31 The inner rotor 33, 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 in which the rotor 33 is installed and in a hollow cylindrical shape, and a flange 312 connected to the main cylindrical portion 311 and arranged perpendicular to the axis L. The main cylindrical portion 311 and the The flanges 312 jointly define a accommodating space 313 arranged along the axis L and open in one direction. The flange 312 has a circumferential edge 314 formed around the axis L, and a disk perpendicular to the circumferential edge 314. The end surface 315, a step groove 316 recessed by the disk end surface 315, the step groove 316 has a large diameter portion 317 adjacent to the disk end surface 315, and a small diameter portion 318 connected to the large diameter portion 317, The large-diameter portion 317 is composed of a groove bottom surface 317' and a groove peripheral surface 317" intersecting and connected to the groove bottom surface 317'. The groove bottom surface 317' is recessed with an annular groove 319 surrounding the axis L. The drain element 60 is installed in the annular groove 319.

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

The rear cover shield 50 can be made of plastic material (in this embodiment, it can be made of engineering plastic material with acid and alkali resistance, such as PP, GFRPP, PVDF, CFRETFE, etc.), and has a set in the housing 31 and the stator 32 and covering the main cylinder portion 311 outside the main body portion 51, and an extension disc portion 52 connected to the main body portion 51 and arranged perpendicular to the axis L, the extension disc portion 52 has a set Located at the large diameter part 317 and abutting the inner ring segment 521 of the groove bottom surface 317', an outer ring segment 522 surrounding the outer ring segment 521, and a turning part connected between the inner ring segment 521 and the outer ring segment 522 523, and an outer ring 524 surrounding the axis L and formed on the outer ring segment 522. The outer ring segment 522 abuts against the disc end surface 315, the turning portion 523 abuts against the groove peripheral surface 317", and the contour range of the outer ring 524 is larger than the contour range of the ring periphery 314. The extended disc portion 52 Through the leak-proof element 60, the flange 312 can be airtightly abutted, and the extension plate 52 can be airtightly abutted against the main plate 11 of the base 10 through the sealing ring 70.

In order to further understand the effects of the cooperation of the various elements of the present invention, the technical means used, and the expected effects, the following descriptions are given. It is believed that a more in-depth and specific understanding of the present invention can be obtained from this.

As shown in Figures 1 and 2, when the entire assembly of the canned magnetic pump with a rear cover shield of the present invention is completed, the pump front cover 40 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 on the Between the pump front cover 40 and the extension plate 52, as a result, 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 uses the leakage prevention element 60 It is clamped between the flange 312 and the extension disc portion 52, and the sealing ring 70 is clamped between the extension disc portion 52 and the side end surface 111 to ensure the pump front cover 40, the flange 312, 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, even if the main cylinder portion 311 of the casing 31 that is often in contact with the chemical liquid is cracked, and the chemical liquid leaks between the casing 31 and the back cover 50 In between, the use of the rear cover shield 50 can prevent the chemical liquid from leaking to the stator 32, and the leak-proof element 60 is also used to install in the ring groove 319, so that the extension plate 52 and the flange Keep air (water) tight between the 312 to ensure the first leak-proof.

Furthermore, the contour range of the outer circumferential edge 524 of the extension disc 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 extension disc portion 52 can pass through the sealing ring 70 Airtight abuts against the main plate 11 of the base 10 to form the third anti-leakage function. Even if the first anti-leakage structure fails, it can effectively prevent the chemical liquid from crossing the extension plate 52. Leakage into the stator 32, therefore, the service life of the motor unit 30 can be prolonged.

Furthermore, the step groove 316 of the flange 312 is matched with the multi-turn structure of the inner ring section 521, the outer ring section 522, and the turning portion 523 of the extension disk portion 52, so that the flange 312 and the extension disk portion The 52 abutment has a multi-turn structure, which can also produce a leakage prevention effect.

In summary, the leak-proof canned magnetic pump with a back cover of the present invention has a simple overall structure, easy manufacture and assembly, and can indeed achieve the purpose of the invention.

However, the above are only examples of the present invention, and should not be used to limit the scope of implementation of the present invention, all applications for patents and patent specifications according to the present invention The simple equivalent changes and modifications made to the content are still within the scope of the patent of the present invention.

10: Pedestal

L: axis

11: Main disk

12: Side cover

13: Support frame

20: positioning seat

30: Motor unit

31: Shell

32: stator

33: Rotor

34: impeller

35: Mandrel

40: Pump front cover

41: Screw

50: Rear cover guard

51: main body

311: main tube

312: Flange

313: housing space

52: Extension plate

60: Leakproof element

70: sealing ring

Claims (5)

A leak-proof canned magnetic pump with a back cover, including: A positioning seat; A motor unit is positioned relative to the positioning base and extends along an axis, and includes a housing, a stator set outside the housing, and a rotor installed inside the housing, the housing having A main cylinder for the rotor to be installed in the shape of a hollow cylinder, and a flange connected to the main cylinder and arranged perpendicular to the axis. The main cylinder and the flange jointly define a A accommodating space that is unidirectionally open, the flange has a circumferential edge formed around the axis, and the rotor is installed in the accommodating space; A rear cover shield having a main body part set between the casing and the stator and covering the outside of the main cylinder part, and an extension disc part connected to the main body part and arranged perpendicular to the axis, The extension disc portion abuts against the flange in an airtight manner, the extension disc portion has an outer circumferential edge formed around the axis, and the contour range of the outer circumferential edge is larger than the contour range of the circumferential edge of the ring; and An anti-leakage element is installed between the flange and the extension plate. The leak-proof canned magnetic pump with a rear cover as described in claim 1, wherein the flange of the motor unit further has a disk end surface facing the extended disk portion, and a step groove recessed from the disk end surface , The step groove has a large diameter portion adjacent to the end surface of the disc, and a small diameter portion connected to the large diameter portion, the large diameter portion is formed by a groove bottom surface and a groove circumference intersecting with the groove bottom surface The extended disc portion of the rear cover shield has an inner ring segment set on the large diameter portion and abutting against the bottom surface of the groove, an outer ring segment surrounding the outer ring segment, and a joint At the turning part between the inner ring segment and the outer ring segment, the outer ring segment abuts against the end surface of the disc, and the turning part abuts against the circumferential surface of the groove. The leak-proof canned magnetic pump with a back cover as described in claim 2, wherein the bottom surface of the groove of the flange of the motor unit is recessed with a ring groove around the axis, and the leak-proof element is installed on the ring In the groove, the flange and the extension disc are kept airtight. The leak-proof canned magnetic pump with a back cover as described in claim 3, further comprising a base set on the fixing base, and a sealing ring set between the base and the extension plate . The leak-proof canned magnetic pump with a back cover as described in claim 4, wherein the base has a main disc member that is ring-shaped around the axis, and a main disc member connected to the main disc member along the axis The side cover member of the main disk member has a side end surface for the outer ring segment to abut, and a ring groove recessed from the side end surface, and the sealing ring is installed in the ring groove so that the main disk member Keep airtight with the extension plate.

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