Stator shielding sleeve, shielding motor and shielding pump

Abstract

The utility model belongs to the technical field of shield pumps, and provides a stator shield sleeve, a shield motor and a shield pump, the stator shield sleeve comprises a shield sleeve plastic layer, an upper metal ring and a lower metal ring; the shielding sleeve plastic layer comprises an upper section part, a middle section part and a lower section part, the outer wall of the upper section part is sleeved with an upper metal ring, and the inner diameter of the upper metal ring is the same as the outer diameter of the upper section part; a lower metal ring is arranged on the periphery of the lower section part, and the outer diameter of the lower metal ring is the same as that of the middle section part; the shielding sleeve plastic layer, the upper metal ring and the lower metal ring are integrally formed.

Description

Technical Field

[0001] The utility model belongs to the technical field of shielded pumps, and in particular relates to a stator shielding sleeve, a shielded motor and a shielded pump. Background Art

[0002] In the field of shielded pump technology, there are two main types of stator shielding sleeves. One is a shielding sleeve made of pure plastic material. This type of shielding sleeve generates very little eddy current loss in the air gap magnetic field of the motor, which also leads to high working efficiency of the motor. However, this type of shielding sleeve has poor pressure resistance and is prone to deformation and failure in high temperature and high pressure environments.

[0003] The other is a shielding sleeve made of metal. This type of shielding sleeve will produce a large amount of eddy current loss due to the magnetic field of the motor air gap, resulting in low motor efficiency. In the field of household high-power energy-saving pumps and energy storage special pumps, the shielded pump is required to work in a high-temperature and high-pressure environment, and the shielded pump is required to have high efficiency. The existing technology cannot meet the requirements of high efficiency and high pressure resistance. Utility Model Content

[0004] In view of the shortcomings of the prior art, the utility model aims to provide a stator shielding sleeve, which has high compressive strength and does not generate turbine loss.

[0005] Another object of the utility model is to provide a shielded motor, which utilizes the above-mentioned stator shielding sleeve. The shielded motor can work in a high temperature and high pressure environment and has high working efficiency.

[0006] Another object of the present utility model is to provide a canned pump, which adopts the above-mentioned stator canned pump or canned motor to increase the service life of the canned pump.

[0007] To achieve this purpose, the utility model adopts the following technical solutions:

[0008] A stator shielding sleeve, comprising a shielding sleeve plastic layer, an upper metal ring and a lower metal ring;

[0009] The plastic layer of the shielding sleeve comprises an upper section, a middle section and a lower section, the outer wall of the upper section is sleeved with an upper metal ring, and the inner diameter of the upper metal ring is the same as the outer diameter of the upper section;

[0010] A lower metal ring is provided on the outer periphery of the lower section, and the outer diameter of the lower metal ring is the same as the outer diameter of the middle section;

[0011] The plastic layer of the shielding sleeve is integrally formed with the upper metal ring and the lower metal ring.

[0012] Preferably, the distance between the lower end of the upper metal ring and the upper end of the lower metal ring along the axial direction is H, and the size of the stator core along the axial direction is H.

[0013] Preferably, the thickness of the upper metal ring is d3, the thickness of the lower metal ring is d4, the thickness of the upper section is d1, and the thickness of the lower section is d2;

[0014] Among them, 0.1mm≤d3≤0.5mm, 0.1mm≤d4≤0.5mm, 1mm≤d1≤3mm, 0.5mm≤d2≤d1-d4.

[0015] Preferably, the outer diameter of the upper section is L1, and the outer diameter of the lower metal ring is the same as the outer diameter L1 of the upper section.

[0016] Preferably, the upper metal ring and the lower metal ring are made of aluminum, copper or stainless steel.

[0017] Preferably, the material of the plastic layer of the shielding sleeve is PPS plastic.

[0018] A shielded motor comprises a stator core assembly and a stator shielding sleeve, wherein the stator core assembly comprises a stator core, the stator core is provided with stator slots, each of the stator slots is provided with a stator notch, and a special-shaped slot wedge is provided in the stator notch.

[0019] Preferably, a slot-shaped limiting groove is arranged on the side wall of each stator slot, and a slot wedge boss is arranged on the special-shaped slot wedge, and the slot wedge boss is embedded in the slot-shaped limiting groove.

[0020] Preferably, the number of the stator slots is N1, the number of the special-shaped slots is N2, and N1=N2=3k, wherein k is an integer not less than 2.

[0021] The utility model also provides a shielded pump, comprising the shielded motor.

[0022] Compared with the prior art, the utility model has the following beneficial effects:

[0023] By arranging the upper metal ring at the upper section of the plastic layer of the shielding sleeve, and the lower metal ring at the lower section of the plastic layer of the shielding sleeve, and arranging the upper metal ring and the lower metal ring at the periphery of the plastic layer of the shielding sleeve, and the three are injection molded in one piece, the overall compressive strength of the stator shielding sleeve is improved to meet the requirements of high temperature and high pressure working environment. The middle section of the stator shielding sleeve is the shielding sleeve plastic layer, which contacts the stator core, does not generate a large amount of eddy current loss, and the motor efficiency will not be greatly reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a structural schematic diagram of the stator shielding sleeve in the utility model;

[0025] Figure 2 It is a structural schematic diagram of the stator core assembly and the stator shielding sleeve in the utility model;

[0026] Figure 3 It is a structural schematic diagram of the stator core in the utility model;

[0027] Figure 4 It is a structural schematic diagram of the special-shaped slot wedge in the utility model.

[0028] Among them, 1. plastic layer of shielding sleeve; 11. upper section; 12. middle section; 13. lower section; 2. upper metal ring; 3. lower metal ring; 4. stator core; 41. stator slot; 42. stator notch; 43. slot-shaped limiting groove; 5. copper wire; 6. special-shaped slot wedge; 61. slot wedge boss. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0030] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0031] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0032] In the description of the present utility model, it should be noted that the terms "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use. They are only for the convenience of describing the present utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance. In the description of the present utility model, unless otherwise specified, "multiple" means two or more.

[0033] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] In the present utility model, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] like Figure 1-Figure 4 As shown, a stator shielding sleeve is provided in this embodiment, which includes a shielding sleeve plastic layer 1, the shielding sleeve plastic layer 1 includes an upper section 11, a middle section 12 and a lower section 13, the outer wall of the upper section 11 is provided with an upper metal ring 2, and the inner diameter of the upper metal ring 2 is the same as the outer diameter of the upper section 11.

[0037] A lower metal ring 3 is disposed on the outer periphery of the lower section 13, and the outer diameter of the lower metal ring 3 is the same as the outer diameter of the middle section 12;

[0038] The plastic layer 1 of the shielding sleeve is integrally formed with the upper metal ring 2 and the lower metal ring 3 .

[0039] By arranging the upper metal ring 2 on the upper section 11 of the shielding sleeve plastic layer 1, and the lower metal ring 3 on the lower section 13 of the shielding sleeve plastic layer 1, and arranging the upper metal ring 2 and the lower metal ring 3 on the periphery of the shielding sleeve plastic layer 1, and the three are injection molded in one piece, the overall compressive strength of the stator shielding sleeve is improved to meet the requirements of high temperature and high pressure working environment. The middle section 12 of the stator shielding sleeve is the shielding sleeve plastic layer 1, and the middle section 12 is in contact with the stator core 4, so a large amount of eddy current loss will not be generated, and the motor efficiency will not be greatly reduced.

[0040] When the internal shielding sleeve plastic layer 1 is subjected to the liquid pressure inside, the upper metal ring 2 provides support for the upper section 11 of the shielding sleeve plastic layer 1, and the lower metal ring 3 provides support for the lower section 13 of the shielding sleeve plastic layer 1, to prevent the internal liquid from expanding and deforming the shielding sleeve plastic layer 1. If the upper section 11 and the lower section 13 are not supported, the pressure resistance of the two ends is poor, and deformation is easy to occur, resulting in failure of the sealing structure installed on the upper section 11 and the lower section 13.

[0041] Preferably, the axial distance between the lower end of the upper metal ring 2 and the upper end of the lower metal ring 3 is H, and the axial size of the stator core 4 is H, so as to ensure that the size of the middle section 12 is H, which can be the same as the axial size of the stator core 4, ensuring that the stator core 4 can fully support the middle section 12 in the axial direction.

[0042] Preferably, the thickness of the upper metal ring 2 is d3, the thickness of the lower metal ring 3 is d4, the thickness of the upper section 11 of the shielding sleeve plastic layer 1 is d1, and the thickness of the lower section 13 of the shielding sleeve plastic layer 1 is d2. Among them, 0.1mm≤d3≤0.5mm, 0.1mm≤d4≤0.5mm, 1mm≤d1≤3mm, 0.5mm≤d2≤d1-d4.

[0043] Preferably, the outer diameter of the upper section 11 of the plastic layer 1 of the shielding sleeve is L1, and the outer diameter of the lower metal ring 3 is the same as the outer diameter L1 of the upper section 11 of the plastic layer 1 of the shielding sleeve.

[0044] During installation, the stator shielding sleeve is inserted into the stator core 4, the lower section 13 passes through the stator core 4, the outer wall of the middle section 12 of the shielding sleeve is in contact with the inner wall of the stator core 4, and the upper section 11 and the lower section 13 are respectively located outside the stator core 4. To facilitate the lower section 13 to pass through the stator core 4 smoothly, the outer diameter of the lower metal ring 3 is the same as the outer diameter L1 of the upper section 11 of the plastic layer 1 of the shielding sleeve.

[0045] Preferably, the upper metal ring 2 and the lower metal ring 3 are made of aluminum, copper or stainless steel, which are low in cost and have a compressive strength that meets requirements.

[0046] Preferably, the upper metal ring 2 and the lower metal ring 3 are made of stainless steel.

[0047] Preferably, the shielding sleeve plastic layer 1 is made of PPS plastic, which has low cost for molding the shielding sleeve plastic layer 1 and is easy to process and shape.

[0048] A shielded motor is provided in this embodiment, including a stator core assembly and the above-mentioned stator shielding sleeve, the stator core assembly includes a stator core 4 and a copper wire 5 wound on the stator core 4, the stator core 4 is provided with stator slots 41, each stator slot 41 is provided with a stator slot opening 42, and a special-shaped slot wedge 6 is provided in the stator slot opening 42.

[0049] The middle section 12 of the shielding sleeve is inserted into the stator core 4 , and the inner side wall of the stator core 4 and the inner side wall of the special-shaped slot wedge 6 located in the slot wedge limiting groove form a circle to support the middle section 12 of the shielding sleeve.

[0050] The turbine loss of the stator shielding sleeve in the prior art is only caused by the changing air gap magnetic field of the motor passing through the shielding sleeve. The area where the stator shielding sleeve in this embodiment contacts the inner circle of the stator core 4 is the main area of ​​the air gap magnetic field. The material of the stator shielding sleeve in this area is set in a plastic layer with good insulation performance, while other areas of the stator shielding sleeve are less affected by the air gap magnetic field. Therefore, the eddy current loss generated by the stator shielding sleeve can be greatly suppressed, thereby improving the efficiency of the shielded motor and achieving high-efficiency operation.

[0051] Preferably, the number of stator slots 41 is N1, the number of special-shaped slots is N2, N1=N2=3k, wherein k is an integer not less than 2. The number of stator slots 41 is limited to an even number.

[0052] Preferably, a slot-shaped limiting groove 43 is provided on the side wall of each stator slot 42, and a slot wedge boss 61 is provided on the special-shaped slot wedge 6, and the slot wedge boss 61 is embedded in the slot-shaped limiting groove 43, and the special-shaped slot wedge 6 is installed and fixed by the slot-shaped limiting groove 43. Preferably, the slot-shaped limiting groove 43 is arc-shaped.

[0053] Preferably, the inner side of the special-shaped slot wedge 6 is in an arc shape, the radius of the arc-shaped special-shaped slot wedge 6 is R1, the radius of the inner arc of the stator core 4 is R2, and R1=R2=L1 / 2. This ensures that after the special-shaped slot wedge 6 is inserted into the slot-shaped limiting groove 43, it can contact the outer wall of the stator shielding sleeve inserted into the stator core 4, thereby supporting the stator shielding sleeve.

[0054] Preferably, the axial length of the special-shaped slot wedge 6 along the stator core 4 is H2, and the axial length of the stator core 4 is H1, H1 = H2 = H. It is ensured that the special-shaped slot wedge 6 can fully support the stator shielding sleeve along the axial length of the stator core 4, and the special-shaped slot wedge 6 and the stator core 4 form a complete inner circular surface that is completely fitted with the middle section 12 of the stator shielding sleeve, thereby increasing the compressive strength of the middle section 12 of the stator shielding sleeve, and finally achieving the improvement of the compressive strength of the entire area of ​​the stator shielding sleeve to meet the requirements of the high temperature and high pressure working environment.

[0055] Preferably, the material of the special-shaped slot wedge 6 is compression molded fiber or aluminum and stainless steel. By using a material with higher strength, the middle section of the plastic layer of the shielding sleeve is supported to improve the overall compressive strength of the stator shielding sleeve.

[0056] Preferably, the material of the special-shaped slot wedge 6 is compression molded fiber or aluminum. Using stainless steel will increase the overall weight of the stator shield. Using compression molded fiber or aluminum is light in weight and can ensure compressive strength.

[0057] This embodiment also provides a canned pump, including the above-mentioned stator shielding sleeve or the above-mentioned canned motor, so as to increase the service life of the canned pump.

[0058] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation methods of the present invention. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all implementation methods here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the claims of the present invention.

Claims

1. A stator shielding sleeve, characterized in that: The stator shielding sleeve comprises a shielding sleeve plastic layer (1), an upper metal ring (2) and a lower metal ring (3); The plastic layer (1) of the shielding sleeve comprises an upper section (11), a middle section (12) and a lower section (13); an upper metal ring (2) is sleeved on the outer wall of the upper section (11); and the inner diameter of the upper metal ring (2) is the same as the outer diameter of the upper section (11); A lower metal ring (3) is provided on the outer periphery of the lower section (13), and the outer diameter of the lower metal ring (3) is the same as the outer diameter of the middle section (12); The shielding sleeve plastic layer (1) is integrally formed with the upper metal ring (2) and the lower metal ring (3).

2. The stator shielding sleeve according to claim 1, characterized in that: The stator shielding sleeve is inserted into the stator core (4) of the motor; The distance between the lower end of the upper metal ring (2) and the upper end of the lower metal ring (3) along the axial direction is H, and the dimension of the stator core (4) along the axial direction is H.

3. The stator shielding sleeve according to claim 1 or 2, characterized in that: The thickness of the upper metal ring (2) is d3, the thickness of the lower metal ring (3) is d4, the thickness of the upper section (11) is d1, and the thickness of the lower section (13) is d2; Among them, 0.1mm≤d3≤0.5mm, 0.1mm≤d4≤0.5mm, 1mm≤d1≤3mm, 0.5mm≤d2≤d1-d4.

4. The stator shielding sleeve according to claim 1 or 2, characterized in that: The outer diameter of the upper section (11) is L1, and the outer diameter of the lower metal ring (3) is the same as the outer diameter L1 of the upper section (11).

5. The stator shielding sleeve according to claim 1 or 2, characterized in that: The upper metal ring (2) and the lower metal ring (3) are made of aluminum, copper or stainless steel.

6. The stator shielding sleeve according to claim 1 or 2, characterized in that: The material of the shielding sleeve plastic layer (1) is PPS plastic.

7. A canned motor, characterized in that: The invention comprises a stator core assembly and a stator shielding sleeve as claimed in any one of claims 1 to 6, wherein the stator core assembly comprises a stator core (4), the stator core (4) is provided with stator slots (41), each of the stator slots (41) is provided with a stator notch (42), and a special-shaped slot wedge (6) is provided in the stator notch (42).

8. The canned motor according to claim 7, characterized in that: A slot-shaped limiting groove (43) is provided on the side wall of each stator slot opening (42), and a slot wedge boss (61) is provided on the special-shaped slot wedge (6), and the slot wedge boss (61) is embedded in the slot-shaped limiting groove (43).

9. The canned motor according to claim 8, characterized in that: The number of the stator slots (41) is N1, the number of the special-shaped slots is N2, and N1=N2=3k, wherein k is an integer not less than 2.

10. A canned motor pump, characterized in that: A shielded motor comprising the shielded motor described in any one of claims 7 to 9.

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