In-pump magnetic group device

Abstract

A pump inner magnetic group device comprises an inner magnetic unit, a coating unit and an inner magnetic base. The inner magnetic unit is provided with a lower metal piece, an upper metal piece, a steel sheet set and a magnet set. The wrapping unit is made of plastic materials and wraps the outer portion of the inner magnetic unit. The wrapping unit is provided with an inner combination area and a plurality of concave holes. The inner magnetic base is made of a plastic material, is connected to the coating unit in a hot melting manner and is provided with a bottom plate and an outer combination area, and the outer combination area is connected to the inner combination area in a hot melting manner and seals the concave hole, so that the inner magnetic base and the coating unit are sealed, the sealing performance of the pump inner magnetic group device is high, and the service life of the pump inner magnetic group device is prolonged. And leakage is not easy to generate.

Description

Technical Field

[0001] The utility model relates to a liquid pumping device, in particular to a magnetic group device in a pump. Background Art

[0002] There is currently a canned magnetic pump (disclosed in the patent case of Taiwan Patent Certificate No. I795038), which includes a base, a positioning seat, a motor unit, a pump front cover and a rear cover. A rotor of the motor unit has a metal internal magnetic component and a plastic coating layer covering the outside of the metal internal magnetic component. The plastic coating layer is used to completely cover the metal internal magnetic component by injection molding. However, under the extrusion of injection pressure, before the plastic coating layer hardens, the internal metal internal magnetic component will shift. After the injection is completed, the shift cannot be determined from the appearance. Additional dynamic balancing adjustment is required, and dynamic balancing correction actions such as weight reduction or weight increase are not possible.

[0003] Therefore, the rotor manufactured by the above manufacturing method will cause the degree of deviation of the metal inner magnetic component to be unstable, which will affect the control of yield.

[0004] In order to solve the above problems, the manufacturing method of the rotor must be changed, and in response to the change in the manufacturing method, the structural design of the rotor must also be adjusted to solve the sealing and leakage problems. Utility Model Content

[0005] The purpose of the utility model is to provide a magnetic group device in a pump which can solve the problems of the prior art.

[0006] The internal magnetic assembly device of the pump of the present invention comprises an internal magnetic unit, a covering unit and an internal magnetic base. The internal magnetic unit comprises a lower metal part, an upper metal part, a steel sheet group and a magnet group. The covering unit is made of plastic material and covers the outside of the internal magnetic unit. The covering unit has an inner bonding area and a plurality of recessed holes provided in the inner bonding area. The internal magnetic base is made of plastic material and is heat-melted to the covering unit, and has a bottom plate and an outer bonding area provided on the bottom plate. The outer bonding area is heat-melted to the inner bonding area and closes the recessed holes.

[0007] The internal magnetic group device of the pump described in the present invention, the inner coupling area of the covering unit has a bottom end surface, a hollow portion recessed by the bottom end surface, and a groove connected to the bottom end surface and surrounding the periphery of the recessed hole, the hollow portion is defined by a shoulder surface and an inner wall surface connected to the shoulder surface and the bottom end surface, the recessed hole and the groove are recessed by the shoulder surface, the outer coupling area of the internal magnetic base also has a boss connected to the bottom plate, several convex columns connected to the boss, and a convex ring connected to the boss and surrounding the periphery of the convex column, the boss is embedded in the hollow portion and at least hot-melt-bonded to the shoulder surface, the convex columns are respectively embedded in the corresponding recessed holes, and the convex ring is embedded in the recessed groove.

[0008] In the pump internal magnetic assembly device of the present invention, the lower metal piece of the internal magnetic unit has a plurality of embedded holes respectively connected to the concave holes, and the protruding columns extend into the corresponding embedded holes.

[0009] The internal magnetic group device of the pump described in the present invention, the inner coupling area of the covering unit has a bottom end surface, a hollow portion recessed by the bottom end surface, an inner coupling ring protruding in the hollow portion, and an outer sealing ring protruding in the hollow portion and surrounding the periphery of the inner coupling ring; the concave hole is arranged inside the inner coupling ring; the hollow portion is defined by a shoulder surface, an expanded diameter inner wall surface connected to the shoulder surface and the bottom end surface, and a narrow diameter inner wall surface; the outer coupling area of the internal magnetic base has an outer coupling ring connected to the bottom plate, and a convex ring connected to the bottom plate and surrounding the periphery of the outer coupling ring; the bottom plate is at least heat-melted to the shoulder surface, the outer coupling ring is heat-melted to the inner coupling ring, and the convex ring is heat-melted to the outer sealing ring.

[0010] The internal magnetic group device of the pump described in the present invention comprises an inner coupling ring of the covering unit having an inner ring and several inner positioning rings that are spaced apart and connected to the inner ring, the recessed holes are respectively arranged inside the inner positioning rings, and the outer coupling ring of the internal magnetic base comprises an outer ring and several outer positioning rings that are spaced apart and connected to the outer ring.

[0011] The internal magnetic group device of the pump described in the present invention has an inner coupling area of the covering unit further comprising an inner concave groove arranged on the inner side of the inner coupling ring, the inner concave groove having an alignment portion with an enlarged width, and the outer coupling area of the internal magnetic base further comprising an alignment block arranged on the inner side of the outer coupling ring, the alignment block being embedded in the alignment portion.

[0012] The beneficial effect of the present invention is that the covering unit is used to cover the outside of the internal magnetic unit, and the internal magnetic base is thermally melted and bonded to the covering unit, thereby achieving better tightness between the internal magnetic base and the covering unit. The pump internal magnetic assembly has high tightness after manufacture and is not prone to leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a cross-sectional view of the first embodiment of the magnetic group device in the pump of the utility model applied to a canned magnetic pump;

[0014] Figure 2 is a perspective exploded view of the first embodiment applied to the canned magnetic pump;

[0015] Figure 3 is a partial exploded perspective view of the first embodiment;

[0016] Figure 4 is a combined sectional view of the first embodiment;

[0017] Figure 5 is a schematic diagram of injection molding of the first embodiment;

[0018] Figure 6 is a schematic diagram of heat melting of the first embodiment;

[0019] Figure 7 is a schematic diagram of the pressing of the first embodiment;

[0020] Figure 8 This is a partial exploded perspective view of the second embodiment of the magnetic assembly device in the pump of the utility model;

[0021] Figure 9 is a combined sectional view of the second embodiment;

[0022] Figure 10 It is along Figure 9 A sectional view taken along the line X-X in FIG. DETAILED DESCRIPTION

[0023] The present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0024] Before the present invention is described in detail, it should be noted that similar components are represented by the same reference numerals in the following description.

[0025] See Figure 1 and Figure 2The first embodiment of the magnetic assembly device 100 in a pump of the present invention is applied to a canned magnetic pump 1. The canned magnetic pump 1 further includes a base 101, a fixing base 102 sleeved inside the base 101, a pump front cover 103 mounted on one side of the base 101, a pump rear cover 104 mounted on the other side of the base 101, a shell 105 mounted inside the base 101, a stator 106 mounted between the shell 105 and the fixing base 102, a shaft 107 mounted inside the shell 105, a bearing unit 108, and an impeller 109. The magnetic assembly device 100 in the pump is mounted inside the shell 105 and supported by the shaft 107. The impeller 109 is connected to the magnetic assembly device 100 in the pump. The bearing unit 108 is sleeved between the magnetic assembly device 100 in the pump and the shaft 107.

[0026] like Figure 3 and Figure 4 As shown, the pump internal magnetic assembly device 100 of the present invention includes an internal magnetic unit 10 , a covering unit 20 and an internal magnetic base 30 .

[0027] The internal magnetic unit 10 comprises a lower metal member 11, an upper metal member 12, a steel sheet assembly 13, and a magnet assembly 14. The lower metal member 11 comprises a lower disk portion 111 and a lower tube portion 112 connected to the lower disk portion 111. The lower disk portion 111 comprises a plurality of insert holes 113 spaced apart around an axis L. The upper metal member 12 comprises an upper disk portion 121 spaced apart from the lower disk portion 111 along the axis L, and an upper tube portion 122 connected to the upper disk portion 121. The upper tube portion 122 of the upper metal member 12 is butted against the lower tube portion 112 of the lower metal member 11 along the axis L, forming an annular groove 15 between the lower disk portion 111, the lower tube portion 112, the upper disk portion 121, and the upper tube portion 122. The steel plate assembly 13 is sleeved in the annular groove 15 and surrounds the upper tube portion 122 and the lower tube portion 112. The magnet assembly 14 includes a plurality of magnets 141 surrounding the axis L and fixed to the steel plate assembly 13.

[0028] The covering unit 20 has an inner bonding area 21 and several recessed holes 22 disposed in the inner bonding area 21. The inner bonding area 21 has a bottom end surface 211, a hollow portion 212 recessed from the bottom end surface 211, and a groove 213 connected to the bottom end surface 211 and surrounding the recessed holes 22. The hollow portion 212 is defined by a shoulder surface 214 and an inner wall surface 215 connected to the shoulder surface 214 and the bottom end surface 211. The recessed holes 22 and the groove 213 are recessed from the shoulder surface 214. The covering unit 20 is made of a plastic material such as polypropylene (PP), polyvinylidene difluoride (PVDF), or carbon fiber filled ethylene tetrafluoroethylene (CFETE), and is acid, alkali, and corrosion resistant. The melting point of polypropylene is 167°C, the melting point of polyvinylidene fluoride is 171°C, and the melting point of ethylene tetrafluoroethylene is 256-280°C.

[0029] The inner magnetic base 30 includes a base plate 31 and an outer bonding area 32 disposed on the base plate 31. The outer bonding area 32 is heat-fused to the inner bonding area 21 and seals the recessed hole 22. The outer bonding area 32 has a boss 321 connected to the base plate 31, a plurality of bosses 33 connected to the boss 321, and a raised ring 322 connected to the boss 321 and surrounding the outer periphery of the bosses 33. The boss 321 is embedded in the hollow portion 212 and heat-fused to at least the shoulder surface 214. The bosses 33 are respectively embedded in the corresponding recessed hole 22 and the embedding hole 113, and the raised ring 322 is embedded in the groove 213. The inner magnetic base 30 is made of a plastic material such as polypropylene (PP), polyvinylidene difluoride (PVDF), or carbon fiber-filled ethylene tetrafluoroethylene (CFETE), and is acid, alkali, and corrosion-resistant. The melting points of polypropylene, polyvinylidene difluoride, and ETFE are 167°C, 171°C, and 256-280°C, respectively. The inner magnetic base 30 is thermally bonded to the cover unit 20.

[0030] The manufacturing method of the magnetic assembly device 100 in the pump comprises the following steps:

[0031] Step 1: Prepare an injection mold 2 (see Figure 5 ), a hot pressing device 3 (see Figure 6 and Figure 7 ), the internal magnetic unit 10, and the internal magnetic base 30. Figure 5The injection mold 2 includes a mold cavity 201 and an ejector unit 202 fixed inside the mold cavity 201. The ejector unit 202 has a base 203, a protrusion 204 connected to the base 203, a plurality of ejector parts 205 connected to the protrusion 204, and a rib 206 connected to the protrusion 204 and surrounding the outer periphery of the ejector parts 205. Figure 6 and Figure 7 The hot pressing device 3 includes a heating unit 301 and a pressing unit 302. The shape and structure of the internal magnetic base 30 correspond to the ejector unit 202, the bottom plate 31 corresponds to the chassis 203, the boss 321 corresponds to the protrusion 204, the bosses 33 correspond to the ejector members 205, and the convex ring 322 corresponds to the rib 206.

[0032] Step 2: When the injection mold 2 is in an open state (not shown), the internal magnetic unit 10 is installed in the mold cavity 201 of the injection mold 2, and the ejector pins 205 are respectively embedded in the embedding holes 113 of the lower metal part 11, so that the internal magnetic unit 10 is supported and positioned by the ejector pins 202, and then the injection mold 2 is operated from the open state to a closed state (such as Figure 5 status).

[0033] Step 3: Re-attend Figure 5 A plastic material is injected into the mold cavity 201 of the injection mold 2 , and the plastic material produces the covering unit 20 . The covering unit 20 covers the outside of the inner magnetic unit 10 and a portion of the ejector unit 202 .

[0034] Step 4: After cooling, the injection mold 2 is operated from the closed state to the open state, and a semi-finished product 100 ′ is taken out from the mold cavity 201 . The semi-finished product 100 ′ has the inner bonding area 21 of the covering unit 20 and the recessed hole 22 .

[0035] Step 5: If Figure 6 As shown, the inner magnetic base 30 and the semi-finished product 100' are placed in the hot pressing device 3, and according to the melting point of the materials selected for the coating unit 20 and the inner magnetic base 30, the coating unit 20 and the inner magnetic base 30 of the semi-finished product 100' are first heated to a predetermined temperature by the heating unit 301. The heating temperature is up to 300°C, and the heating range includes a part or the entirety of the opposing surface of the coating unit 20 and the inner magnetic base 30. Figure 7As shown, after the heating unit 301 retreats relative to the covering unit 20 and the internal magnetic base 30, the pressing unit 302 moves the internal magnetic base 30 toward the hollow portion 212 of the semi-finished product 100'. Specifically, the bosses 321 of the internal magnetic base 30 are embedded in the hollow portion 212, the bosses 33 are embedded in the corresponding recesses 22 and extend into the corresponding embedding holes 113, and the protruding rings 322 are embedded in the grooves 213. The pressing unit 302 then continues to press the internal magnetic base 30 and the semi-finished product 100' together. The press-melt depth between the outer bonding area 32 of the internal magnetic base 30 and the inner bonding area 21 of the semi-finished product 100' is 0.5 to 1 mm. The internal magnetic base 30 and the semi-finished product 100' are thermally fused together to form the pump internal magnetic assembly 100.

[0036] In order to provide a further understanding of the functions, technical means, and expected effects of the cooperation of the various components of the present invention, the following description will be given. It is believed that this will provide a deeper and more specific understanding of the present invention.

[0037] like Figure 5 As shown, the ejector pins 205 of the ejector pin unit 202 are respectively embedded in the embedding holes 113 of the lower metal member 11, thereby stably positioning the internal magnetic unit 10 within the mold cavity 201. This prevents the internal magnetic unit 10 from being squeezed and deflected by the injection pressure of the plastic material during injection into the mold cavity 201 of the injection mold 2, making it easier to control product yield. Furthermore, the pump internal magnetic assembly device 100 can reduce the need for dynamic balancing adjustments, eliminating the need for weight reduction or weight increase in dynamic balancing corrections.

[0038] like Figure 6 As shown, the heating unit 301 is used to heat the coating unit 20 and the inner magnetic base 30 of the semi-finished product 100', so that the opposing surfaces of the coating unit 20 and the inner magnetic base 30 of the semi-finished product 100' are heated and melted. Figure 7 As shown, the inner magnetic base 30 is then pressed together with the semi-finished product 100' using the pressing unit 302, thereby thermally fusing the outer bonding area 32 of the inner magnetic base 30 to the corresponding portion of the inner bonding area 21 of the semi-finished product 100'. The pump internal magnetic assembly 100 exhibits excellent adhesion after manufacture, preventing chemical liquids from penetrating into the inner magnetic unit 10 and ensuring the service life of the pump internal magnetic assembly 100.

[0039] It is worth mentioning that Figure 3 and Figure 4As shown, the convex columns 33 of the internal magnetic base 30 are respectively embedded in the corresponding concave holes 22, the convex ring 322 is embedded in the groove 213, and the boss 321 is embedded in the hollow portion 212, so that a multi-concave and convex circuitous design is generated between the internal magnetic base 30 and the covering unit 20. The internal magnetic assembly device 100 of the pump has high tightness after manufacture and is not prone to leakage.

[0040] Therefore, the pump internal magnetic assembly 100 manufactured using the above-described manufacturing method can ensure that when the pump internal magnetic assembly 100 is immersed in a liquid medicine, the liquid medicine will not enter the interior of the internal magnetic unit 10. It can also ensure that all materials are concentric both inside and outside during injection molding. When the pump internal magnetic assembly 100 rotates rapidly, the dynamic balance and vibration values are within the standard range, which can ensure that the service life of the pump internal magnetic assembly 100 is extended. The structural design of the pump internal magnetic assembly 100 can also solve the problems of sealing and leak prevention.

[0041] like Figures 8 to 10 As shown, the second embodiment of the pump internal magnetic assembly device 100 of the present invention comprises an internal magnetic unit 10, a covering unit 20' and an internal magnetic base 30'. The structure of the internal magnetic unit 10 is the same as that of the first embodiment and will not be further described.

[0042] The covering unit 20' has an inner bonding area 21' and a plurality of recessed holes 22' disposed in the inner bonding area 21'. The inner bonding area 21' has a bottom end surface 211', a hollow portion 212' recessed from the bottom end surface 211', an inner engagement ring 213' protruding from the hollow portion 212', an outer sealing ring 214' protruding from the hollow portion 212' and surrounding the outer periphery of the inner engagement ring 213', and an inner recessed groove 23' disposed on the inner side of the inner engagement ring 213'. The hollow portion 212' is defined by a shoulder surface 215', an expanded inner wall surface 216' connecting the shoulder surface 215' and the bottom end surface 211', and a narrowed inner wall surface 217'. The inner engaging ring 213' comprises an inner ring 218' and a plurality of inner positioning rings 219' spaced apart and connected to the inner ring 218'. The inner groove 23' has an enlarged alignment portion 231'. The recessed holes 22' are disposed within the inner engaging ring 213' and are respectively disposed within the inner positioning rings 219'.

[0043] The inner magnetic base 30' includes a bottom plate 31' and an outer coupling area 32' provided on the bottom plate 31'. The outer coupling area 32' has an outer coupling ring 321' connected to the bottom plate 31', a convex ring 322' connected to the bottom plate 31' and surrounding the outer periphery of the outer coupling ring 321', and an alignment block 323' provided on the inner side of the outer coupling ring 321' and embedded in the alignment portion 231'. The outer coupling ring 321' has an outer ring 324' and a plurality of outer positioning rings 325' arranged at intervals and connected to the outer ring 324'. The bottom plate 31' is heat-melted to the shoulder surface 215', the outer coupling ring 321' is heat-melted to the inner coupling ring 213', and the convex ring 322' is heat-melted to the outer sealing ring 214'.

[0044] Referring to the above manufacturing method, the internal magnetic base 30' can be thermally fused with the covering unit 20' of the semi-finished product 100' to form the pump internal magnetic assembly 100. The second embodiment of the pump internal magnetic assembly 100 of the present invention can also achieve the same purpose and effect as the first embodiment.

[0045] In summary, the magnetic assembly device 100 in the pump of the present invention has a simple overall structure and manufacturing and assembly, and can indeed achieve the purpose of the present invention.

Claims

1. A pump internal magnetic assembly device, comprising an internal magnetic unit, a covering unit, and an internal magnetic base, characterized in that: The internal magnetic unit comprises a lower metal part, an upper metal part, a steel sheet group and a magnet group; The covering unit is made of plastic material and covers the outside of the inner magnetic unit. The covering unit has an inner bonding area and a plurality of concave holes arranged in the inner bonding area; The inner magnetic base is made of plastic material and is heat-melted to the covering unit. It has a bottom plate and an outer bonding area arranged on the bottom plate. The outer bonding area is heat-melted to the inner bonding area and closes the concave hole.

2. The magnetic assembly device in the pump according to claim 1, characterized in that: The inner coupling area of the covering unit has a bottom end surface, a hollow portion recessed by the bottom end surface, and a groove connected to the bottom end surface and surrounding the periphery of the recessed hole. The hollow portion is defined by a shoulder surface and an inner wall surface connected to the shoulder surface and the bottom end surface. The recessed hole and the groove are recessed by the shoulder surface. The outer coupling area of the inner magnetic base also has a boss connected to the bottom plate, several convex columns connected to the boss, and a convex ring connected to the boss and surrounding the periphery of the convex column. The boss is embedded in the hollow portion and is at least hot-melt bonded to the shoulder surface. The convex columns are respectively embedded in the corresponding recessed holes, and the convex ring is embedded in the recessed groove.

3. The magnetic assembly device in the pump according to claim 2, characterized in that: The lower metal piece of the inner magnetic unit has a plurality of embedded holes respectively connected to the concave holes, and the protruding columns extend into the corresponding embedded holes.

4. The magnetic assembly device in a pump according to claim 1, characterized in that: The inner bonding area of the covering unit has a bottom end surface, a hollow portion recessed by the bottom end surface, an inner bonding ring protruding from the hollow portion, and an outer sealing ring protruding from the hollow portion and surrounding the periphery of the inner bonding ring. The recessed hole is arranged inside the inner bonding ring. The hollow portion is defined by a shoulder surface, an expanded diameter inner wall surface connected to the shoulder surface and the bottom end surface, and a narrow diameter inner wall surface. The outer bonding area of the inner magnetic base has an outer bonding ring connected to the bottom plate, and a convex ring connected to the bottom plate and surrounding the periphery of the outer bonding ring. The bottom plate is at least heat-melted to the shoulder surface, the outer bonding ring is heat-melted to the inner bonding ring, and the convex ring is heat-melted to the outer sealing ring.

5. The magnetic assembly device in a pump according to claim 4, characterized in that: The inner coupling ring of the covering unit has an inner ring and several inner positioning rings that are spaced apart and connected to the inner ring. The recessed holes are respectively arranged inside the inner positioning rings. The outer coupling ring of the inner magnetic base has an outer ring and several outer positioning rings that are spaced apart and connected to the outer ring.

6. The magnetic assembly device in a pump according to claim 5, characterized in that: The inner coupling area of the covering unit also has an inner concave groove arranged on the inner side of the inner coupling ring, and the inner concave groove has an alignment portion with an enlarged width. The outer coupling area of the inner magnetic base also includes an alignment block arranged on the inner side of the outer coupling ring, and the alignment block is embedded in the alignment portion.

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