JP5903515B2 - Sealed stator - Google Patents

Description

  The present invention relates to a sealed stator in which a stator of an electric motor is sealed.

  In a conventional sealed stator, as shown in Patent Document 1, a stator having a stator core and a stator coil is wrapped with first and second coating materials, and the end portion of the first coating material and the second coating material are wrapped. The ends of the material are joined together by tight welding.

JP 2001-86667 A

  However, in such a sealed stator, in order to join the end portion of the first covering material and the end portion of the second covering material by tight welding, the thickness of the first and second covering materials is set to be the same. It is necessary to make it a predetermined value, that is, 200 μm or more. For this reason, the gap of the magnetic circuit between the inner peripheral surface of the stator iron core of the electric motor and the outer peripheral surface of the rotor increases, and the efficiency of the electric motor decreases.

  The present invention has been made to solve the above-described problems, and an object thereof is to provide a sealed stator capable of reducing the thickness of a covering material.

  In order to achieve this object, an embodiment of the present invention is a sealed stator, in which a stator coil is wound around a stator core, a filler filled in a stator coil portion, a cylinder made of the stator and the filler. A ring member provided at both ends of the cylindrical body and having an inner peripheral flange portion and an outer peripheral flange portion; an inner peripheral surface of the cylindrical body and the inner peripheral flange portion; An inner periphery covering material joined by tight welding, and an outer periphery covering material covering the outer peripheral surface of the cylindrical body and the outer peripheral flange portion, and having an end portion joined to the outer peripheral flange portion by tight welding. The inner peripheral flange portion has a thickness greater than that of the inner peripheral cover material, and the outer periphery of the inner peripheral flange portion covers the end of the inner peripheral flange portion so that the end portion of the inner peripheral cover material covers the end portion of the inner peripheral flange portion. Face side Bent, characterized in that the end portion of the inner peripheral dressing is in contact with the outer peripheral surface of the inner peripheral flange portion.

  Further, a sealing material is provided at the tip of the inner peripheral flange portion, the end of the inner peripheral covering material is bent toward the outer peripheral surface of the inner peripheral flange portion, and the sealing material is attached by the end of the inner peripheral covering material. It may be characterized by covering.

  Moreover, it is good also as the film | membrane which has abrasion resistance laminated | stacked on the outer surface of the said inner periphery coating | covering material.

  In the sealed stator according to the present invention, the inner peripheral flange portion and the end portion of the inner peripheral covering material are joined by tight welding, and the thickness of the inner peripheral flange portion of the ring member is greater than the thickness of the inner peripheral covering material. Therefore, the thickness of the inner peripheral covering material can be reduced.

  Further, by bending the end portion of the inner peripheral covering material toward the outer peripheral surface side of the inner peripheral flange portion, it is possible to prevent liquid from entering the tight welded portion between the inner peripheral flange portion and the inner peripheral covering material. Therefore, crevice corrosion can be prevented from occurring in the tight welded portion between the inner peripheral flange portion and the inner peripheral covering material.

In addition, a sealing material is provided at the tip of the inner peripheral flange, the end of the inner peripheral covering is bent toward the outer peripheral surface of the inner peripheral flange, and the sealing is covered with the end of the inner peripheral covering. Therefore, it is possible to reliably prevent liquid from entering the tight welded portion between the outer peripheral flange portion and the outer peripheral covering material. It can be surely prevented from occurring.
Moreover, when the film | membrane which has abrasion resistance is laminated | stacked on the outer surface of the inner peripheral coating | covering material, damage to the inner peripheral coating | coated material by a foreign material can be prevented.

FIG. 1 is a schematic sectional view showing a sealed stator according to an embodiment of the present invention. FIG. 2 is a schematic sectional view showing the sealed rotor according to the embodiment of the present invention. FIG. 3 is a schematic sectional view showing the electric motor. FIG. 4 is a cross-sectional view showing a part of a sealed stator according to another embodiment of the present invention. FIG. 5 is a sectional view showing a part of a sealed stator according to another embodiment of the present invention. FIG. 6 is a sectional view showing a part of a sealed stator according to another embodiment of the present invention.

A sealed stator 8 according to an embodiment of the present invention will be described with reference to FIG. A stator coil 2 is wound around the stator core 1. The stator core 1 and the stator coil 2 constitute a stator 3. The stator coil 2 is filled with a filler 4 made of silicon resin. The stator 3 and the filler 4 constitute a cylindrical body. Ring members 5 are provided at both ends of the cylindrical body made of the stator 3 and the filler 4. The ring member 5 has a U-shaped cross section, and an inner peripheral flange portion 5a is provided on the inner peripheral portion of the annular plate, and an outer peripheral flange portion 5b is provided on the outer peripheral portion of the annular plate. The inner diameter of the inner peripheral flange portion 5 a of the ring member 5 is the same as the inner diameter of the cylindrical body made of the stator 3 and the filler 4, and the outer diameter of the outer peripheral flange portion 5 b of the ring member 5 is made of the stator 3 and the filler 4. It is the same as the outer diameter of the cylindrical body. An opening portion between the inner peripheral flange portion 5a and the outer peripheral flange portion 5b of the ring member 5 opens in the axial direction of the stator 3 (left and right direction in FIG. 1). The ring member 5 is made of austenitic stainless steel, and the thickness of the inner peripheral flange portion 5a and the outer peripheral flange portion 5b of the ring member 5 is 1 to 1.5.
mm, for example 1.2 mm. The cylindrical body formed of the stator 3 and the filler 4 and the inner peripheral surface of the inner peripheral flange portion 5 a of the ring member 5 are covered with the inner peripheral covering material 6. A cylindrical body composed of the stator 3 and the filler 4 and the outer peripheral surface of the outer peripheral flange portion 5 b of the ring member 5 are covered with the outer peripheral covering material 7. The inner periphery covering material 6 and the outer periphery covering material 7 are made of austenitic stainless steel, and the inner periphery covering material 6 and the outer periphery covering material 7 have a thickness of 40 to 90 μm, for example, 60 μm. That is, the thickness of the inner peripheral flange portion 5 a and the outer peripheral flange portion 5 b of the ring member 5 is larger than the thickness of the inner peripheral cover material 6 and the outer peripheral cover material 7. The inner peripheral flange portion 5a of the ring member 5 and the end portion of the inner peripheral covering material 6 are joined by tight welding. The outer peripheral flange portion 5b of the ring member 5 and the end portion of the outer peripheral covering material 7 are joined by tight welding. A conductor (not shown) of the stator coil 2 penetrates the annular plate of the ring member 5 in a tight manner.

  A method for manufacturing the sealed stator 8 shown in FIG. 1 will be described. First, ring members 5 are provided at both ends of a cylindrical body composed of the stator 3 and the filler 4. Next, the cylindrical body formed of the stator 3 and the filler 4, the inner peripheral surface of the inner peripheral flange portion 5 a of the ring member 5 is covered with the inner peripheral covering material 6, and the cylindrical body formed of the stator 3 and the filler 4 and The outer peripheral surface of the outer peripheral flange portion 5 b of the ring member 5 is covered with the outer peripheral covering material 7. Next, the inner peripheral flange portion 5a of the ring member 5 and the end portion of the inner peripheral covering material 6 are joined by tight welding, and the outer peripheral flange portion 5b of the ring member 5 and the end portion of the outer peripheral covering material 7 are tightly sealed. Join by welding. This tight welding is performed by seam welding in which alternating current or direct current having a frequency of 1000 to 10000 Hz and an effective current value of 1000 to 30000 A is applied. Next, a fluid pressure is applied to the outer surfaces of the inner peripheral covering material 6 and the outer peripheral covering material 7, and a vacuum device is connected to a vacuum connection port (not shown) provided in the annular plate of the ring member 5. 5 and the part sealed by the inner periphery covering material 6 and the outer periphery covering material 7 are evacuated, and then a sealing plug is provided at the vacuum connection port.

  Next, the sealed rotor 15 according to the embodiment of the present invention will be described with reference to FIG. Ring members 12 are provided at both ends of the rotor 11. The ring member 12 has a U-shaped cross section, and an inner peripheral flange portion 12a is provided on the inner peripheral portion of the annular plate, and an outer peripheral flange portion 12b is provided on the outer peripheral portion of the annular plate. The inner diameter of the inner peripheral flange portion 12 a of the ring member 12 is the same as the inner diameter of the rotor 11, and the outer diameter of the outer peripheral flange portion 12 b of the ring member 12 is the same as the outer diameter of the rotor 11. The opening between the inner peripheral flange portion 12a and the outer peripheral flange portion 12b of the ring member 12 opens in the axial direction of the rotor 11 (left and right direction in FIG. 2). The ring member 12 is made of austenitic stainless steel, and the thickness of the inner peripheral flange portion 12a and the outer peripheral flange portion 12b of the ring member 12 is 1 to 1.5 mm, for example 1.2 mm. The inner peripheral surface of the inner peripheral flange portion 12 a of the rotor 11 and the ring member 12 is covered with an inner peripheral covering material 13. The outer peripheral surface of the outer peripheral flange portion 12 b of the rotor 11 and the ring member 12 is covered with the outer peripheral covering material 14. The inner periphery covering material 13 and the outer periphery covering material 14 are made of austenitic stainless steel, and the inner periphery covering material 13 and the outer periphery covering material 14 have a thickness of 40 to 90 μm, for example, 60 μm. That is, the thickness of the inner peripheral flange portion 12a and the outer peripheral flange portion 12b of the ring member 12 is larger than the thickness of the inner peripheral cover material 13 and the outer peripheral cover material 14. The inner peripheral flange portion 12a of the ring member 12 and the end portion of the inner peripheral covering material 13 are joined together by tight welding. The outer peripheral flange portion 12b of the ring member 12 and the end portion of the outer peripheral covering material 14 are joined by tight welding.

  A method for manufacturing the sealed rotor 15 shown in FIG. 2 will be described. First, ring members 12 are provided at both ends of the rotor 11. Next, the inner peripheral surface of the inner peripheral flange portion 12a of the rotor 11 and the ring member 12 is covered with the inner peripheral cover material 13, and the outer peripheral surface of the outer peripheral flange portion 12b of the rotor 11 and the ring member 12 is covered with the outer peripheral cover material 14. . Next, the inner peripheral flange portion 12a of the ring member 12 and the end portion of the inner peripheral covering member 13 are joined by tight welding, and the outer peripheral flange portion 12b of the ring member 12 and the end portion of the outer peripheral covering member 14 are tightly sealed. Join by welding. This tight welding is performed by seam welding in which an alternating current having a frequency of 2000 to 8000 Hz and an effective current value of 1000 to 12000 A is applied. Next, fluid pressure is applied to the outer surfaces of the inner peripheral covering material 13 and the outer peripheral covering material 14, and a vacuum device is connected to a vacuum connection port (not shown) provided in the annular plate of the ring member 12, so that the ring member 12 and the part sealed by the inner periphery covering material 13 and the outer periphery covering material 14 are evacuated, and then a sealing plug is provided at the vacuum connection port.

  The electric motor will be described with reference to FIG. A rotating shaft 22 made of austenitic stainless steel is rotatably supported on the casing 21 via bearings 23 and 24 in a casing 21 made of austenitic stainless steel. A sealed stator 8 is attached to the casing 21. A sealed rotor 15 is attached to the rotary shaft 22.

  In the sealed stator 8 shown in FIG. 1, the inner peripheral flange portion 5 a of the ring member 5, the outer peripheral flange portion 5 b and the inner peripheral covering material 6, and the end of the outer peripheral covering material 7 are joined by tight welding. Since the thickness of the inner peripheral flange portion 5a and the outer peripheral flange portion 5b of the ring member 5 is larger than the thickness of the inner peripheral cover material 6 and the outer peripheral cover material 7, the end of the inner peripheral cover material 6 and the end of the outer peripheral cover material 7 The thickness of the inner periphery covering material 6 and the outer periphery covering material 7 can be made small compared with the case where a part is joined by direct dense welding.

  Further, in the sealed rotor 15 shown in FIG. 2, the inner peripheral flange portion 12a, the outer peripheral flange portion 12b of the ring member 12, the inner peripheral covering material 13, and the end portion of the outer peripheral covering material 14 are joined by tight welding. Since the thickness of the inner peripheral flange portion 12a and the outer peripheral flange portion 12b of the ring member 12 is larger than the thickness of the inner peripheral cover material 13 and the outer peripheral cover material 14, the end of the inner peripheral cover material 13 and the outer peripheral cover material 14 Compared with the case where it joins with the edge part of this by direct dense welding, the thickness of the inner peripheral coating material 13 and the outer peripheral coating material 14 can be made small.

  Further, in the electric motor shown in FIG. 3, since the thickness of the inner peripheral covering material 6 of the sealed stator 8 and the outer peripheral covering material 14 of the sealed rotor 15 can be reduced, the inner peripheral surface of the stator iron core 1 can be reduced. Since the gap of the magnetic circuit between the rotor and the outer peripheral surface of the rotor 11 can be reduced, the efficiency is increased.

  If a film having a wear resistance of 3 to 40 μm, for example, 20 μm, is laminated on the outer surface of the inner peripheral covering material 6 and the outer peripheral covering material 14, Damage can be prevented.

  Next, a sealed stator according to another embodiment of the present invention will be described with reference to FIG. An end portion of the inner peripheral covering material 6 is bent toward the outer peripheral surface side of the inner peripheral flange portion 5 a of the ring member 5.

  Similarly, although not shown, the end portion of the outer peripheral covering material 7 is bent toward the inner peripheral surface side of the outer peripheral flange portion 5 b of the ring member 5. Although not shown, the end portion of the inner peripheral covering material 13 is bent toward the outer peripheral surface of the inner peripheral flange portion 12a of the ring member 12, and the end portion of the outer peripheral covering material 14 is the inner end of the outer peripheral flange portion 12b of the ring member 12. It is bent to the peripheral surface side.

  In this sealed stator and sealed rotor, a tight welded portion between the inner peripheral flange portion 5a of the ring member 5 and the inner peripheral covering material 6, a tight welded portion between the outer peripheral flange portion 5b of the ring member 5 and the outer peripheral covering material 7, The liquid is prevented from entering the close-welded portion between the inner peripheral flange portion 12a of the ring member 12 and the inner peripheral cover member 13, and the close-welded portion between the outer peripheral flange portion 12b of the ring member 12 and the outer peripheral cover member 14. Therefore, the inner peripheral flange portion 5a of the ring member 5 and the inner peripheral covering material 6 are tightly welded, the outer peripheral flange portion 5b of the ring member 5 and the outer peripheral covering member 7 are tightly welded, and the ring member 12 It is possible to prevent crevice corrosion from occurring in a tight welded portion between the inner peripheral flange portion 12a and the inner peripheral covering material 13 and in a close welded portion between the outer peripheral flange portion 12b and the outer peripheral covering material 14 of the ring member 12. .

  Next, a sealed stator according to another embodiment of the present invention will be described with reference to FIG. A sealing material 31 made of silicon resin is provided at the tip of the inner peripheral flange portion 5 a of the ring member 5. The end portion of the inner peripheral covering material 6 is bent toward the outer peripheral surface side of the inner peripheral flange portion 5 a of the ring member 5, and the end portion of the inner peripheral covering material 6 covers the sealing material 31.

  Similarly, although not shown, a sealing material made of silicon resin is provided at the tip of the outer peripheral flange portion 5 b of the ring member 5, and the end portion of the outer peripheral covering material 7 is on the inner peripheral surface side of the outer peripheral flange portion 5 b of the ring member 5. The end portion of the outer covering material 7 covers the sealing material. Although not shown, a sealing material made of silicon resin is provided at the tip of the inner peripheral flange portion 12 a and the outer peripheral flange portion 12 b of the ring member 12, and the end portion of the inner peripheral covering material 13 is the inner peripheral flange of the ring member 12. The end portion of the outer peripheral covering material 14 is bent toward the inner peripheral surface side of the outer peripheral flange portion 12b of the ring member 12, and the end portions of the inner peripheral covering material 13 and the outer peripheral covering material 14 are sealed. It covers the material.

  In this sealed stator and sealed rotor, a tight welded portion between the inner peripheral flange portion 5a of the ring member 5 and the inner peripheral covering material 6, a tight welded portion between the outer peripheral flange portion 5b of the ring member 5 and the outer peripheral covering material 7, It is ensured that the liquid penetrates into the tight welded portion between the inner peripheral flange portion 12a of the ring member 12 and the inner peripheral covering material 13, and the tight welded portion between the outer peripheral flange portion 12b of the ring member 12 and the outer peripheral covering material 14. The inner peripheral flange portion 5a of the ring member 5 and the inner peripheral covering material 6 can be prevented from being tightly welded. The outer peripheral flange portion 5b of the ring member 5 and the outer peripheral covering member 7 can be prevented from being tightly welded. It is possible to reliably prevent crevice corrosion from occurring in the tightly welded portion between the inner peripheral flange portion 12a and the inner peripheral covering member 13 and the tightly welded portion between the outer peripheral flange portion 12b and the outer peripheral covering member 14 of the ring member 12. can do.

  Next, a sealed stator according to another embodiment of the present invention will be described with reference to FIG. A step portion 41 is provided at the tip of the inner peripheral surface of the inner peripheral flange portion 5 a of the ring member 5. An end portion of the inner peripheral covering material 6 is bent toward the outer peripheral surface side of the inner peripheral flange portion 5 a of the ring member 5. In this case, the step portion 41 is covered with the inner periphery covering material 6. An annular clip 42 is provided at the tip of the inner peripheral flange portion 5 a of the ring member 5. That is, the inner peripheral covering material 6 is sandwiched between the tip of the inner peripheral flange portion 5 a and the clip 42. The outer surface of the inner peripheral covering material 6 and the inner peripheral surface of the clip 42 are on the same cylindrical surface. That is, the diameter of the outer peripheral surface of the inner peripheral covering material 6 is equal to the diameter of the inner peripheral surface of the clip 42.

  In this sealed stator, since it is possible to reliably prevent liquid from entering the inner peripheral flange portion 5a of the ring member 5 and the tightly welded portion of the inner peripheral covering material 6, the inner peripheral flange portion of the ring member 5 can be prevented. It is possible to reliably prevent crevice corrosion from occurring in the tightly welded portion between 5a and the inner periphery covering material 6.

  In the above-described embodiment, the thickness of the inner peripheral covering material 6, the outer peripheral covering material 7, the inner peripheral covering material 13, and the outer peripheral covering material 14 is set to 40 to 90 μm, and the thickness of the film having abrasion resistance is set. Although the thickness is 3 to 40 μm, these are merely examples, and the thickness of the inner peripheral coating material 6, the outer peripheral coating material 7, the inner peripheral coating material 13, the outer peripheral coating material 14, and the thickness of the film having wear resistance. Can be appropriately determined.

  In the above embodiment, the thickness of the inner peripheral covering material 6, the outer peripheral covering material 7, the inner peripheral covering material 13, and the outer peripheral covering material 14 is set to 60 μm, for example. The thickness of the covering material 6 may be larger, and the thickness of the inner peripheral covering material 13 may be larger than the thickness of the outer peripheral covering material 14.

  Moreover, in the above-mentioned embodiment, although the thickness of the ring members 5 and 12 was 1 to 1.5 mm, these are illustrations to the last, and the thickness of the ring members 5 and 12 can be determined as appropriate. .

  In the above-described embodiment, the ring members 5 and 12, the inner periphery covering material 6, the outer periphery covering material 7, the inner periphery covering material 13, the outer periphery covering material 14, the casing 21, and the rotating shaft 22 are made of austenitic stainless steel. In this case, a ring member made of another nonmagnetic material, an inner periphery covering material, an outer periphery covering material, a casing, and a rotating shaft can be used.

  In the above embodiment, the sealed rotor 15 is attached to the rotating shaft 22, but a normal rotor may be attached to the rotating shaft 22.

  In the above-described embodiment, the ring member 5 and the inner periphery covering material 6, the portion sealed by the outer periphery covering material 7, the ring member 12, the inner periphery covering material 13, and the portion sealed by the outer periphery covering material 14 are vacuumed. However, the portion sealed by the ring member 5 and the inner peripheral covering material 6 and the outer peripheral covering material 7 and the portion sealed by the ring member 12 and the inner peripheral covering material 13 and the outer peripheral covering material 14 do not have to be evacuated.

  DESCRIPTION OF SYMBOLS 1 ... Stator iron core, 2 ... Stator coil, 3 ... Stator, 4 ... Filler, 5 ... Ring member, 6 ... Inner circumference coating material, 7 ... Outer circumference coating material, 8 ... Sealed stator, 11 ... Rotor, 12 ... Ring member , 13 ... Inner circumference coating material, 14 ... Outer circumference coating material, 15 ... Sealed rotor, 21 ... Casing, 22 ... Rotating shaft

Claims (3)

A stator having a stator coil wound around a stator core;
A filler filled in the stator coil portion;
A ring member provided at both ends of a cylindrical body made of the stator and the filler and having an inner peripheral flange portion and an outer peripheral flange portion;
An inner periphery covering material that covers an inner peripheral surface of the cylindrical body and the inner peripheral flange portion, and an end portion of which is joined to the inner peripheral flange portion by tight welding;
An outer peripheral covering material that covers the outer peripheral surface of the cylindrical body and the outer peripheral flange portion, and an end portion of which is joined to the outer peripheral flange portion by tight welding,
The thickness of the inner peripheral flange portion is larger than the thickness of the inner peripheral covering material,
The end of the inner peripheral covering material is bent toward the outer peripheral surface of the inner peripheral flange so that the end of the inner peripheral flange covers the end of the inner peripheral flange, and the end of the inner peripheral covering is A sealed stator characterized by being in contact with a surface.   A sealing material is provided at the tip of the inner peripheral flange, and the end of the inner peripheral covering material is bent toward the outer peripheral surface of the inner peripheral flange so as to cover the end of the sealing material and the inner peripheral flange. The hermetically sealed stator according to claim 1, wherein The sealed stator according to claim 1 or 2, wherein a film having wear resistance is laminated on the outer surface of the inner peripheral covering material.

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