Motor for shield pump and shield pump

Abstract

The utility model discloses a motor for a shield pump and the shield pump, and belongs to the field of shield pumps. According to the motor for the shield pump, a common end fixing part and an external end fixing part are arranged on the outer end side of a stator framework, and a common end of a three-phase line winding is connected to the common end fixing part; a gap is formed between the common end fixing part and the inner wall of the shell cavity of the base shell, and an insulating separator is arranged in the gap and is configured to enable the common end of the three-phase line winding to be insulated and isolated from the inner wall of the shell cavity of the base shell; therefore, the condition of conductive breakdown or poor insulation caused by the fact that the metal chips are left in the space to conduct the motor and the motor can be effectively avoided, and the stability of the motor of the shield pump is obviously improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of shielded pumps, more particularly to a motor for shielded pump and shielded pump. BACKGROUND

[0002] The shielded pump is combined with the motor and the pump body together, and the motor and the pump body are isolated by the shielding structure, so that the liquid leakage is prevented. The shielded pump is mainly composed of the pump body, the impeller, the stator, the rotor, the front and rear bearings and the thrust disc and other components. The stator and the rotor are isolated by the non-magnetic corrosion-resistant thin-walled sleeve, and the rotor is supported by the front and rear bearings and immersed in the conveying medium, so that any dynamic seal is not required to prevent the medium leakage. Since there is no dynamic seal, the external gas cannot enter the pump, the shielded pump is suitable for the vacuum system operation, and has high safety, and has been widely applied. However, the applicant finds through market feedback that some shielded pumps have unstable conditions of sudden change of motor current after a period of use, and even some motors have internal wire group burnout, which greatly affects the performance stability of the shielded pump. The applicant has monitored this situation for a long time, and finds that this fault has no rules to follow and is accidental. In order to solve this problem, the applicant even improves the design of the motor internal winding, magnetic steel and other related components, which greatly increases the cost while the effect is very small, which deeply troubles the applicant, reduces the user experience, and increases the after-sales difficulty. SUMMARY

[0003] 1. Technical problem to be solved by the utility model

[0004] In view of the safety risk of unstable current and even electric breakdown of the shielded pump in the prior art after long-term use, the utility model provides a motor for shielded pump and shielded pump, which can effectively improve the use safety of the shielded pump and protect the performance stability.

[0005] 2. Technical scheme

[0006] In order to achieve the above-mentioned purpose, the utility model provides the technical scheme that:

[0007] The utility model relates to a motor for shielded pump, which comprises a machine seat shell with a shell cavity, and a stator assembly and a rotor assembly installed in the shell cavity of the machine seat shell, and the stator assembly and the rotor assembly are isolated by a shielding sleeve. The stator assembly is supported and installed on the inner wall of the shell cavity of the machine seat shell, and comprises a stator core and two annular stator skeletons respectively inserted into the both ends of the stator core, and a three-phase wire winding is wound on the stator skeleton. Wherein:

[0008] The outer end side of the stator framework is provided with a common end fixing portion and an external connection end fixing portion, the external connection end of the three-phase wire winding is connected to the external connection end fixing portion for external connection, and the common end of the three-phase wire winding is connected to the common end fixing portion.

[0009] The insulating isolation piece can effectively block the conduction risk between the common end of the three-phase wire winding and the inner wall of the shell cavity of the machine shell, thereby effectively avoiding the conditions of electric conduction breakdown or poor insulation.

[0010] Further, the insulating isolation piece is an insulating cap covering the common end fixing portion, and the insulating cap covers the top wall of the common end fixing portion and the outer side wall close to the inner wall of the shell cavity of the machine shell.

[0011] Further, the insulating isolation piece is an insulating glue filling layer filled between the outer side wall of the common end fixing portion and the inner wall of the shell cavity of the machine shell.

[0012] Further, a plurality of groups of inward protruding ribs are circumferentially and spaced apart on the inner wall of the shell cavity of the machine shell, and the ribs are configured to be matched and installed with the outer circumferential surface of the stator core.

[0013] Further, at least one axial extension plane portion is arranged on the circumferential arc-shaped outer wall of the stator core, the distance between the plane portion and the inner wall of the shell cavity of the machine shell is greater than the distance between the arc-shaped outer wall of the stator core and the inner wall of the shell cavity of the machine shell, the plane portion corresponds to the region between the adjacent two groups of ribs on the machine shell, and the circumferential position of the common end fixing portion on the stator framework corresponds to the position of the plane portion, thereby further increasing the distance between the outer side wall of the common end fixing portion and the inner wall of the shell cavity of the machine shell.

[0014] Further, a wire clamp mounting cavity is arranged in the common end fixing portion, the wire clamp is inserted into the wire clamp mounting cavity and is in conduction with the common end of the three-phase wire winding, the common end wire tail extends out of the outer side wall of the common end fixing portion from the wire clamp mounting cavity, and the insulating isolation piece is configured to isolate the common end wire tail from the inner wall of the shell cavity of the machine shell.

[0015] Further, the lower part of the common end fixing position of the three-phase winding in the line card installation cavity is provided with a supporting rib.

[0016] Further, the two sides of the line card installation cavity are provided with limiting ribs, and the two sides of the line card are correspondingly provided with limiting protrusions.

[0017] The utility model discloses a shielding pump motor as mentioned above.

[0018] 3. Beneficial effects

[0019] Compared with the prior art, the technical scheme has the following beneficial effects:

[0020] (1) The shielding pump motor has an insulation isolation piece between the common end fixing part and the shell cavity inner wall of the machine base shell, which can insulate and isolate the common end of the three-phase winding from the shell cavity inner wall of the machine base shell, effectively avoid the conduction breakdown or poor insulation caused by metal debris falling into the space, and obviously improve the stability of the shielding pump motor.

[0021] (2) The shielding pump motor has a plurality of inward protruding ribs on the shell cavity inner wall of the machine base shell, and the common end fixing part on the stator framework corresponds to the area between the two adjacent groups of ribs in the circumferential direction, and the space between the two adjacent groups of ribs and the shell cavity inner wall of the machine base shell can form a spacing area. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 It is an internal sectional view of the shielding pump in the embodiment.

[0023] Figure 2 It is a partial enlarged structure schematic view of the common end fixing part in the embodiment. Figure 1

[0024] Figure 3 It is a structure schematic view of the stator assembly in the embodiment.

[0025] Figure 4 It is a structure schematic view of the common end fixing part without an insulation cap in the embodiment. Figure 3

[0026] Figure 5 ​​Assembling structure schematic view of stator assembly and base shell in the embodiment;

[0027] Figure 6 Structure schematic view of upper framework of stator assembly in the embodiment;

[0028] Figure 7 As Figure 6 Partial enlarged structure schematic view of common end fixed part in the embodiment;

[0029] Figure 8 As Figure 7 Partial enlarged structure schematic view of common end fixed part after removing line card in the embodiment;

[0030] Figure 9 Structure schematic view of line card in the embodiment;

[0031] Figure 10 As Figure 9 Structure schematic view of rear side of line card in the embodiment;

[0032] Figure 11 Structure schematic view of insulation cap in the embodiment.

[0033] Explanation of the reference numerals in the schematic view:

[0034] 100, stator assembly; 200, insulation cap; 210, isolation part; 300, base shell; 310, convex rib; 320, interval area;

[0035] 110, stator core; 111, plane part; 112, positioning groove;

[0036] 120, upper framework; 130, lower framework; 140, three-phase line winding; 141, common end line tail;

[0037] 150, common end fixed part; 151, line card mounting cavity; 152, line outlet groove; 153, partition rib; 154, support rib; 155, limiting rib; 160, external connection end fixed part;

[0038] 400, line card; 410, front panel; 411, line card groove; 412, opening groove; 413, limiting protrusion; 420, rear panel; 430, bottom connecting plate; 440, abutting part; 450, communication plate. DETAILED DESCRIPTION

[0039] In order to further understand the content of the present application, the present application will be described in detail with reference to the accompanying drawings.

[0040] In the description of the utility model, it needs to be explained that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0041] In addition, it needs to be explained that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the communication inside two elements; the terms "first", "second", "third", "fourth" should be understood broadly, only for distinguishing feature names, and do not indicate a specific order relationship. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0042] The utility model will be further described below in combination with examples.

[0043] Examples

[0044] The performance stability of the shield pump is very important in the industry, as mentioned in the background art, the applicant has been engaged in the production and research of pump body structure for a long time, and market feedback finds that some shield pumps may have the risk of current mutation and even burning of internal wire group during long-term use, which greatly affects the user's experience, and the applicant has carried out a large amount of technical investigation and detection, but has always been unable to accurately judge the real reason for the problem, resulting in although various optimization and upgrading designs are made for the product, but such occasional situations still occur, which causes great trouble to the applicant. In view of this situation, the applicant has researched intensively, spent a lot of effort to analyze, compare and verify each production link and component structure of the shield pump, and the hard work does not disappoint the person with a heart, and the applicant finally sees the beginning.

[0045] It should be noted that the industry has a variety of different power and model products according to the working condition requirements, and there are differences between different products in design, including the design of the three-phase wire winding method of the stator assembly. For some products, the three-phase common end of the three-phase winding is fixed by manually winding and welding to realize current conduction of the three-phase wire tail. For some products, due to the requirements of three-phase wire diameter and installation space, it is not possible to connect the three-phase common end by manual winding. At this time, the industry's conventional design is to fix the three-phase common end to the common end fixing part, and then use a wire clamp to insert the common end fixing part. The wire clamp is provided with a wire clamping groove for piercing the three-phase common end. After the wire clamp is inserted, it can pierce the enameled wire of the three-phase common end, and the enameled wire is connected by the wire clamp to realize current conduction. The applicant found through a large number of summaries and comparisons that the connection method of the wire clamp connecting the three-phase common end is more likely to cause the above-mentioned current sudden change instability. Further research found that under this connection method, the practical operation process is to first lead the three-phase common end out of the wire slot of the common end fixing part. In order to facilitate winding, the enameled wire is generally led out from the inside to the outside and clamped in the wire slot. The wire clamp is inserted into the wire clamp installation cavity of the common end fixing part from top to bottom, pierces the enameled wire to realize three-phase connection, and the excess enameled wire extending outside the common end fixing part is cut off. At this time, the wire tail of the enameled wire must be slightly beyond the wire slot of the common end fixing part, that is, slightly beyond the outer wall of the common end fixing part. The cut enameled wire tail end is exposed without a protective layer. After the stator assembly is installed in the shell cavity of the machine seat shell, there is a gap between the exposed enameled wire and the inner wall of the shell cavity of the machine seat shell, and the gap is small. When metal debris accidentally falls into the gap, it is easy to conduct the enameled wire tail and the inner wall of the shell cavity of the machine seat shell, thereby causing conductive breakdown of the wire group or poor insulation. This situation has a great degree of randomness, so it is difficult to find and troubleshoot the real cause.

[0046] In view of the above important findings, the applicant has optimized the shield pump motor, specifically, in combination with Figures 1-11As shown, a shielded pump motor of this embodiment includes a base housing 300 with a shell cavity, and a stator assembly 100 and a rotor assembly installed in the shell cavity of the base housing 300, wherein the stator assembly 100 and the rotor assembly are isolated by a shielding sleeve; the stator assembly 100 is supported and installed on the inner wall of the shell cavity of the base housing 300, and includes a stator core 110 and two annular stator frames respectively inserted into the two ends of the stator core 110, and a three-phase winding 140 is wound on the stator frame; the above is a conventional setting of a shielded pump motor, and in this Without going into details, it should be noted that a common end fixing portion 150 and an external end fixing portion 160 are provided on the outer end side of the stator frame, and the external end of the three-phase winding 140 is connected to the external end fixing portion 160 for external wiring; the common end of the three-phase winding 140 is connected to the common end fixing portion 150; wherein there is a gap between the common end fixing portion 150 and the inner wall of the shell cavity of the base casing 300, and an insulating isolation member is provided in the gap, and the insulating isolation member is configured to insulate and isolate the common end of the three-phase winding 140 from the inner wall of the shell cavity of the base casing 300. Combined with the above analysis, by arranging an insulating isolator in this interval, the risk of conduction between the exposed end face of the common end wire tail 141 and the inner wall of the shell cavity of the machine base housing 300 can be effectively blocked. Even if metal chips are left behind, the common end of the three-phase winding 140 and the machine base housing 300 cannot be connected due to the isolation of the insulating isolator, thereby effectively avoiding conductive breakdown or poor insulation. In practice, the stability of the shielded pump motor has been significantly improved.

[0047] In practice, the stator frame generally includes an upper frame 120 and a lower frame 130, both of which are made of plastic insulating material; the common end fixing portion 150 and the external end fixing portion 160 can be selectively arranged on the upper frame 120 or on the lower frame 130, or on different frames respectively, which will not be elaborated here. In this embodiment, the common end fixing portion 150 and the external end fixing portion 160 are both arranged on the upper frame 120 as an example, and the common end fixing portion 150 and the external end fixing portion 160 are respectively located on both sides of the end of the upper frame 120.

[0048] In order to achieve the isolation effect of the insulating spacer, one of the implementation methods can be selected, such as the insulating spacer is an insulating cap 200 that is covered on the common terminal fixing part 150. The insulating cap 200 covers the top wall of the common terminal fixing part 150 and the outer wall close to the inner wall of the shell cavity of the base housing 300. The insulating cap 200 can be made of rubber. Figure 11As shown in the structural diagram of the insulating cap 200, the outer side wall of the insulating cap 200 is the isolation part 210, and the downward extension depth of the isolation part 210 can completely cover the position of the common end wire tail 141, so as to completely cover the common end wire tail 141 inside; the inner side wall of the isolation part 210 can be shorter than the outer side wall of the isolation part 210 according to the installation space requirement, so as to form a gap on the inner side. In practice, the insulating isolation part can also be selected as an insulating glue filling layer filled between the outer side wall of the common end fixed part 150 and the inner wall of the shell cavity of the machine base shell 300. In the same way, the insulating glue filling layer can also form an insulating protection between the common end wire tail 141 and the inner wall of the shell cavity of the machine base shell 300, and further, the insulating glue filling layer can further cover and protect the top wall of the common end fixed part 150. Similarly, other various ways of setting the insulating isolation part can also be used in the industry, such as setting an insulating coating on the corresponding position of the inner wall of the shell cavity of the machine base shell 300 or the common end fixed part 150, and the like, which will not be described here.

[0049] Further optimization can be combined with Figure 5 As shown, the inner wall of the shell cavity of the machine base shell 300 is provided with a plurality of inwardly protruding ribs 310 at intervals in the circumferential direction, which can be uniformly and evenly spaced. The ribs 310 are configured to be matched and installed with the outer peripheral surface of the stator core 110; the common end fixed part 150 on the stator frame corresponds to the region between the adjacent two groups of ribs 310 in the circumferential direction. The inner wall of the shell cavity of the machine base shell 300 can form a spacing area 320 between the adjacent two groups of ribs 310, the outer peripheral wall surface of the stator core 110 is matched and installed with the inner side end surface of the rib 310, and the spacing area 320 forms an expanded space between the outer peripheral wall surface of the stator core 110 and the inner wall of the shell cavity of the machine base shell 300. In this way, not only is it more convenient to set and install the insulating isolation part, but also the distance between the outer side wall of the common end fixed part 150 and the inner wall of the shell cavity of the machine base shell 300 is further increased, further avoiding the conduction breakdown caused by metal dust, and cooperating with the setting of the insulating isolation part, further enhancing the use stability and safety of the motor.

[0050] Further, in combination with Figure 4As shown, in cooperation with the above-mentioned interval area 320, at least one axial extending planar part 111 is arranged on the circumferential arc-shaped outer wall of the stator core 110, which can be arranged uniformly and at intervals, and the stator core 110 is formed by stacking multiple core pieces, the planar part 111 can be cut downward from the outer wall of the stator core 110, and a positioning groove 112 extending axially downward can be arranged in the middle of the planar part 111 to facilitate the overall positioning of the stator core 110. The distance between the planar part 111 and the inner wall of the shell cavity of the machine base shell 300 is obviously greater than the distance between the arc-shaped outer wall of the stator core 110 and the inner wall of the shell cavity of the machine base shell 300; the planar part 111 corresponds to the area between the adjacent two groups of protruding ribs 310 on the machine base shell 300; the circumferential position of the common end fixing part 150 on the stator framework corresponds to the position of the planar part 111. In this way, through the cooperation of the interval area 320 and the planar part 111, the space between the common end fixing part 150 and the inner wall of the shell cavity of the machine base shell 300 is further increased, meeting the space requirement and insulation performance requirement of the insulation isolation piece.

[0051] In combination Figures 7-10 As shown, the specific structure of the common end fixing part 150 and the line card 400 is shown. In combination Figure 8 , the common end fixing part 150 is provided with a line card mounting cavity 151 for inserting the line card 400 into the line card mounting cavity 151 and conducting with the common end of the three-phase winding 140; the line card mounting cavity 151 is divided into three sub-chambers by two partition ribs 153, and the inner and outer side walls of each sub-chamber are provided with a wire outlet groove 152 communicating with the sub-chamber, and the common end of the three-phase winding 140 corresponds to the wire outlet groove 152 of the three sub-chambers, and extends to the outside of the outer wall of the common end fixing part 150, and the insulation isolation piece is configured to isolate the common end wire tail 141 from the inner wall of the shell cavity of the machine base shell 300. Further, the three sub-chambers of the line card mounting cavity 151 are respectively provided with a support rib 154 below the common end fixing position of the three-phase winding 140. When the line card 400 is inserted downward and pierces the common end enameled wire, the support rib 154 supports the enameled wire below to prevent the common end enameled wire of the three-phase winding 140 from breaking, etc., achieving safety protection.

[0052] As Figure 9 and Figure 10The specific structure of the wire clamp 400 is shown, including the front panel 410, the bottom connecting plate 430 and the rear panel 420 which are distributed in a U shape; the front panel 410, the bottom connecting plate 430 and the rear panel 420 are each provided with three groups corresponding to the three sub-chambers of the wire clamp mounting cavity 151, and the adjacent two groups have a avoiding slot matched with the partition rib 153; and the three groups of front panels 410 are further connected with the communication plate 450, and the inner side of the rear panel 420 is further provided with the inward protruding abutting portion 440, which abuts inwardly on the communication plate 450 to make the communication plate 450 and the front panel 410 tightly contact and connect. The wire clamp 400 is provided with the wire clamping groove 411 with gradually reduced opening from the bottom upwards, and when the wire clamp 400 is inserted into the wire clamp mounting cavity 151 downwards, the surface protective layer of the common end enameled wire is gradually pierced to realize conduction by the wire clamping groove 411. The top of the wire clamping groove 411 is further provided with the opening groove 412 distributed vertically therewith, so as to facilitate the deformation elasticity of both sides of the wire clamping groove 411 when the wire clamp 400 is pressed downwards. In the embodiment, further, the inner wall of each sub-chamber of the wire clamp mounting cavity 151 is respectively provided with the limiting rib 155 on both sides, and the wire clamp 400 is correspondingly provided with the limiting protrusion 413 on both sides, when the wire clamp 400 is inserted into the wire clamp mounting cavity 151, the limiting protrusion 413 is fixed with the limiting rib 155, so as to guarantee the position stability of the wire clamp 400 after being inserted into the wire clamp mounting cavity 151, and prevent the position from shaking.

[0053] The embodiment also provides a shielding pump having the motor for shielding pump as described above, after the optimization, the stability of the shielding pump is improved, and the risk of electric conduction breakdown or poor insulation caused by metal debris is avoided.

[0054] The protection scope of the utility model is limited by the claims. Thanks to the teaching of the utility model, those skilled in the art can easily recognize that the alternative structure of the disclosed structure can be used as a feasible alternative embodiment, and the disclosed embodiments can be combined to produce new embodiments, which also fall within the scope of the appended claims.

Claims

1. A motor for a canned pump, comprising a base housing (300) with a housing cavity, and a stator assembly (100) and a rotor assembly installed in the housing cavity of the base housing (300), the stator assembly (100) and the rotor assembly being isolated by a shield sleeve; the stator assembly (100) is supported and installed on the inner wall of the housing cavity of the base housing (300), and comprises a stator core (110) and two annular stator frames respectively inserted into the inner part of both ends of the stator core (110), and a three-phase winding (140) is wound on the stator frames; characterized in that: a common end fixing part (150) and an external end fixing part (160) are arranged on the outer end side of the stator frame, the external end of the three-phase winding (140) is connected to the external end fixing part (160) for external connection, and the common end of the three-phase winding (140) is connected to the common end fixing part (150); there is a gap between the common end fixing part (150) and the inner wall of the housing cavity of the base housing (300), and an insulating isolation piece is arranged in the gap, and the insulating isolation piece is configured to insulate and isolate the common end of the three-phase winding (140) from the inner wall of the housing cavity of the base housing (300). The insulating isolation piece is an insulating cap (200) covering the common end fixing part (150), and the insulating cap (200) covers the top wall of the common end fixing part (150) and the outer side wall close to the inner wall of the housing cavity of the base housing (300). The insulating isolation piece is an insulating glue filling layer filled between the outer side wall of the common end fixing part (150) and the inner wall of the housing cavity of the base housing (300).

2. A motor for a canned pump according to claim 1, characterized in that: A plurality of groups of inwardly protruding ribs (310) are arranged on the inner wall of the housing cavity of the base housing (300) in a circumferential direction, and the ribs (310) are configured to be matched and installed with the outer circumferential surface of the stator core (110); the common end fixing part (150) on the stator frame corresponds to the region between the adjacent two groups of ribs (310) in the circumferential direction.

3. A motor for a canned pump according to claim 1, characterized in that: At least one axial extending flat part (111) is arranged on the circumferential arc-shaped outer wall of the stator core (110), the distance between the flat part (111) and the inner wall of the housing cavity of the base housing (300) is greater than the distance between the arc-shaped outer wall of the stator core (110) and the inner wall of the housing cavity of the base housing (300); the flat part (111) corresponds to the region between the adjacent two groups of ribs (310) on the base housing (300); the circumferential position of the common end fixing part (150) on the stator frame corresponds to the position of the flat part (111).

4. A motor for a canned pump according to claim 1, characterized in that: The insulating isolation piece is made of rubber.

5. A motor for a canned pump according to claim 4, characterized in that: A wire clamp mounting cavity (151) is arranged in the common end fixing part (150), a wire clamp (400) is inserted into the wire clamp mounting cavity (151) and is in conduction with the common end of the three-phase winding (140); a common end wire tail (141) extends out of the outer side wall of the common end fixing part (150) and beyond the outer side wall, and the insulating isolation piece is configured to isolate the common end wire tail (141) from the inner wall of the housing cavity of the base housing (300).

6. A motor for a canned pump according to claim 1, characterized in that: Support ribs (154) are respectively arranged below the fixed positions of the common end of the three-phase winding (140) in the wire clamp mounting cavity (151).

7. A motor for a canned pump according to any one of claims 1-6, characterized in that: ​ 8. A motor for a canned pump according to claim 7, characterized in that: ​ 9. A motor for a canned pump according to claim 7, characterized in that: Two sides of the line card mounting cavity (151) are respectively provided with limiting ribs (155), and two sides of the line card (400) are correspondingly provided with limiting protrusions (413), when the line card (400) is inserted into the line card mounting cavity (151), the limiting protrusions (413) are matched with the limiting ribs (155) to be fixed.

10. A canned pump characterized by: Motor for a canned pump having a shield as claimed in any of claims 1-9. Motor for a canned pump having a shield as claimed in any of claims 1-9.

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