JP2019082143A - Hermetic type compressor - Google Patents

Abstract

To provide a hermetic type compressor capable of suppressing deformation of a stator while improving efficiency in an operation of an electric motor portion.SOLUTION: A hermetic type compressor 10 includes: an electric motor portion 14 having a stator 20 constituted by forming a through hole portion 26 on a laminate formed by laminating a plurality of magnetic plates 22, and a rotor 30; a compressor portion 15 driven by the electric motor portion; a sealed container 12 for housing them; a sleeve 40 inserted to the through hole portion; a bolt 50 having a shaft portion 51 provided with a screw portion 53 and a head portion 52 disposed on its one end portion, and fixing the stator in the sealed container by fastening the screw portion to a prescribed mounting portion in the sealed container in a state of inserting the shaft portion to the sleeve; and an elastic member having an insertion hole portion to which the sleeve is inserted, and compressed in accordance with fastening of the bolt to the mounting portion to press the laminate in a laminating direction. A dimension L of the sleeve satisfies a relationship of L≥H+Wc to a dimension H of the laminate, and a minimum dimension Wc of the compressed elastic member in the laminating direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a hermetic compressor.

  As a conventional hermetic compressor, a hermetic compressor of Patent Document 1 is known. The sealed compressor includes a motor unit including a stator and a rotor, a compressor unit driven by the motor unit, and a sealed case for housing these. The stator is fixed to the lower part of the frame in the sealed case

JP, 2009-197684, A

  A stator like patent document 1 generally has an iron core constituted by laminating a plurality of electromagnetic steel plates, and is fixed to a frame by a bolt inserted in a hole provided in the iron core . For this motor section, in order to improve the operation efficiency, thinning of the electromagnetic steel sheet is required. However, when the thickness of the magnetic steel sheet is reduced, the magnetic steel sheet may be deformed by the force when the bolt is tightened.

  The present invention is to solve the above-mentioned conventional problems, and it is an object of the present invention to provide a hermetic type compressor capable of suppressing deformation of a stator while achieving efficient operation of a motor unit.

  A sealed compressor according to an aspect of the present invention is a stator having a laminated body in which a plurality of magnetic material plates are laminated, and a through-hole portion penetrating in the laminating direction of the laminated body. A compressor unit driven by the motor unit, a sealed container containing the motor unit and the compressor unit, a sleeve inserted in the through hole, and a screw unit A shaft portion and a head portion provided at one end of the shaft portion, and the screw portion is fastened to a predetermined mounting portion in the sealed container in a state where the shaft portion is inserted into the sleeve A bolt for fixing the stator in the sealed container, and an insertion hole into which the sleeve is inserted, and compressed as the bolt is fastened to the mounting portion, thereby pressing the laminate in the stacking direction An elastic member, and in the stacking direction, Dimension L of the serial sleeve for the minimum dimension Wc of the elastic member size H and the compressed of the laminate satisfy the relationship of L ≧ H + Wc.

  In this closed type compressor, in the stacking direction, the dimension L of the sleeve satisfies the relationship of L <H + Wu with respect to the dimension H of the stacked body and the non-compressed dimension Wu of the elastic member which is not compressed. Good. In the hermetic compressor, the sleeve may be formed of a nonmagnetic material. Furthermore, in the hermetic compressor, the elastic member may be a spring washer. In the hermetic compressor, the elastic member may be disposed between the seat surface of the head and the laminate. Furthermore, the hermetic compressor further includes a flat washer disposed between the laminate and the elastic member, and in the laminating direction, the dimension L of the sleeve is the dimension H of the laminate, the elastic member The relationship of H + Wc + F ≦ L <H + Wu + F may be satisfied with respect to the minimum dimension Wc and the non-compression dimension Wu of the above and the dimension F of the flat washer.

  The present invention is effective in that the deformation of the stator can be suppressed while improving the operation efficiency of the motor unit in the hermetic type compressor.

  The above object, other objects, features and advantages of the present invention will be apparent from the following detailed description of preferred embodiments with reference to the attached drawings.

1 is a cross-sectional view showing a hermetic compressor according to an embodiment of the present invention. FIG. 2 is a cross-sectional view showing a part of the hermetic compressor of FIG. 1; It is a figure which shows the sleeve of FIG. It is a figure which shows the flat washer of FIG. Fig.5 (a) is a figure which shows the spring washer at the time of non-compression, FIG.5 (b) is a figure which shows the spring washer at the time of compression.

  Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings. In the following, the same or corresponding elements are denoted by the same reference numerals throughout all the drawings, and the redundant description will be omitted.

Embodiment
<Sealed compressor>
As shown in FIG. 1, the hermetic type compressor 10 according to the embodiment includes a compressor main body 11 and a hermetic container 12 for housing the same, and the compressor main body 11 brings the refrigerant gas into a high temperature and high pressure state to make the hermetic container 12. It is an apparatus which discharges from. For example, the hermetic compressor 10 can be applied to applications such as a vending machine, a refrigeration showcase, a dehumidifier, and a refrigerator.

  The compressor body 11 is elastically supported by the suspension spring 13 with respect to the hermetic container 12, and includes a motor unit 14 and a compressor unit 15 driven thereby. The motor unit 14 has a stator 20 and a rotor 30 that rotates with respect to this, and for example, a salient pole concentrated winding type DC brushless motor is used.

  The rotor 30 has a cylindrical shape with a cylindrical space inside, is disposed inside the stator 20, and incorporates a permanent magnet (not shown). Here, an inner rotor type in which the rotor 30 is housed inside the stator 20 will be described, but the same applies to an outer rotor type in which the stator 20 is housed inside the rotor 30, so I omit it. The details of the stator 20 will be described later.

  The compressor unit 15 is disposed above the motor unit 14, and includes a shaft 16, a block 17, a piston 18, and a connecting unit 19. The shaft 16 is composed of a main shaft 16a and an eccentric shaft (not shown). The lower portion of the main shaft 16 a is inserted into and fixed to the cylindrical space of the rotor 30 of the motor unit 14. The eccentric shaft extends from the upper end of the main shaft 16a, and the center axis of the eccentric shaft is not parallel to the central axis of the main shaft 16a but is provided in parallel.

  The block 17 is composed of a main bearing 17a and a cylinder 17b. The main bearing 17a has a cylindrical through hole extending parallel to the central axis of the main shaft 16a inside, and the main shaft 16a is rotatably inserted into this through hole, and the main shaft 16a is It supports radially. Further, the main bearing 17a has a thrust surface (not shown) perpendicular to the central axis of the main shaft 16a, and the thrust surface supports the load of the eccentric shaft.

  The cylinder 17 b has a cylindrical internal space extending in a direction perpendicular to the central axis of the main shaft 16 a. One end side of the internal space is closed by a valve plate 17e, and one end portion of the piston 18 is reciprocably inserted from the other end side. A compression chamber 17c is formed in an inner space surrounded by the inner peripheral surface of the cylinder 17b, the piston 18 and the valve plate 17e.

  The other end of the piston 18 is connected to the eccentric shaft by a connecting portion 19. For this reason, the eccentric shaft connected to the main shaft 16 a and the main shaft 16 a is rotated by the rotor 30, and the connection portion 19 converts this rotation into the reciprocating motion of the piston 18. The piston 18 reciprocates in the compression chamber 17c to suck the refrigerant gas enclosed in the closed container 12 into the compression chamber 17c and discharge it from the compression chamber 17c to the outside.

<Stator>
As shown in FIGS. 1 and 2, the stator 20 has a cylindrical iron core 21, and the iron core 21 is formed of a laminate in which a plurality of magnetic plates 22 are laminated. The magnetic plate 22 has an annular disk shape having a circular hole (central hole 23) at the center, and for example, a magnetic steel plate covered with an insulating film or a ferromagnetic material such as amorphous is used. The magnetic plate 22 has a small dimension (thickness) in the stacking direction of the magnetic plates 22 from the viewpoint of the efficiency of the motor unit 14 and is, for example, 0.2 mm or less, preferably 0.1 mm. It is below. In addition to the central hole 23, the magnetic plate 22 is provided with a plurality of circular holes (peripheral holes 24) so as to surround the central hole 23.

  The iron core 21 is formed in a cylindrical shape by the laminated disk-shaped magnetic plate 22, and a hole (accommodating hole 25) formed by the central hole 23 of the magnetic plate 22 and a peripheral hole of the magnetic plate 22 It has a hole (through hole 26) formed by 24. The accommodation hole 25 and the through hole 26 have a cylindrical shape, and penetrate the iron core 21 in the stacking direction. The rotor 30 is accommodated in the accommodation hole 25. The inner circumferential surface of the iron core 21 defining the accommodation hole 25 and the outer circumferential surface of the rotor 30 are opposed to each other and provided in parallel in the stacking direction.

  The sleeve 40 is inserted into the through hole 26. The sleeve 40 is formed of a nonmagnetic material, and examples of the nonmagnetic material include metals such as stainless steel in view of strength and cost. As described above, since the sleeve 40 is a nonmagnetic material, even when the sleeve 40 penetrates the magnetic material plates 22 in the stacking direction, the insulating state formed by the insulating coating is maintained between the adjacent magnetic material plates 22. Thereby, the increase in the eddy current loss in the stator 20 can be reduced.

  As shown in FIGS. 2 and 3, the sleeve 40 has a cylindrical shape having a cylindrical internal space (bolt hole portion 41), and the dimension L in the direction in which the bolt hole portion 41 extends is in the stacking direction of the iron core 21. Larger than dimension H. Further, the outer diameter of the sleeve 40 is slightly smaller than the inner diameter of the through hole portion 26, and the outer peripheral surface is in contact along the inner peripheral surface of the iron core 21 defining the through hole portion 26. The shaft 51 of the bolt 50 is inserted into the bolt hole 41, and the inner diameter of the sleeve 40 (diameter of the bolt hole 41) is set slightly larger than the diameter of the shaft 51.

  As shown in FIGS. 1 and 2, the bolt 50 is a fixing member for attaching the stator 20 to a predetermined mounting portion in the sealed container 12, and has a shaft 51 and a head 52. The mounting portion is, for example, a block 17. The block 17 is provided with an opening 17d, and a spiral groove is formed on the inner peripheral surface of the block 17 defining the opening 17d.

  The shaft portion 51 is a rod-like member having a screw portion 53, and is inserted into the bolt hole portion 41 of the sleeve 40, and the head 52 is connected to one end thereof. The screw portion 53 is provided with a spiral ridge, and is fastened to the spiral groove in the opening 17 d of the block 17. Thereby, the bolt 50 attaches the stator 20 to the block 17. The axial portion 51 may have a constant diameter in a direction parallel to the central axis, and includes a portion having a larger diameter than other portions such as a connecting portion 51a with the head 52 shown in FIG. It may be.

  The head 52 is cylindrical in shape and has a disc-shaped collar 54. The collar 54 is larger in diameter than the shaft 51 and protrudes outward from the outer surface of the main body of the head 52 in the direction orthogonal to the shaft 51. The surface on the opposite side to the main body side of the head 52 of the buttocks 54 is a seating surface 52 a of the head 52. The head 52 is inserted into the other end of the suspension spring 13 whose one end is fixed to the closed container 12. By fixing the suspension spring 13 against the flange portion 54, the compressor main body 11 including the stator 20 is supported with respect to the hermetic container 12.

  Between the iron core 21 of the stator 20 and the head 52 of the bolt 50, a flat washer 60 and a spring washer 70 are interposed. The flat washer 60 is, as shown in FIGS. 2 and 4, an annular disc shape having a circular hole (first insertion hole 61) at the center, and is formed of, for example, a rigid metal such as stainless steel. It is done. The diameter of the first insertion hole 61 (the inner diameter of the flat washer 60) is set to be slightly larger than the outer diameter of the sleeve 40 so that the sleeve 40 is inserted. The dimension (thickness) F between the annular end faces 62 and 63 of the flat washer 60 is constant or substantially unchanged with or without compression or the like.

  The spring washer 70 has an annular disk shape having a circular hole (second insertion hole 71) at the center, as shown in FIGS. The spring washer 70 is formed of, for example, a rigid metal such as stainless steel, and is excellent in chemical resistance, cost, elasticity and rigidity. The diameter of the second insertion hole 71 (inner diameter of the spring washer 70) is set to be slightly larger than the outer diameter of the sleeve 40 so that the sleeve 40 is inserted.

  The spring washer 70 is circumferentially cut by the notch 72 and has both ends 73, 74 of the spring washer 70 sandwiching the notch 72 in the circumferential direction. As shown in FIG. 5A, when no pressure is applied to the spring washer 70 in the extending direction (thickness direction) of the second insertion hole 71 (when not compressed), both ends 73 of the spring washer 70 are used. , 74 (uncompressed dimension Wu, thickness) is larger than the dimension (minimum dimension, thickness) Wc between the annular end faces 75, 76 of the spring washer 70.

  On the other hand, as shown in FIG. 5B, when pressure is applied to the spring washer 70 in the thickness direction (during compression), the difference between both ends 73 and 74 of the spring washer 70 according to the pressure And the dimension (thickness) between the two ends 73 and 74 decreases. Then, the difference between both ends 73 and 74 of the spring washer 70 becomes zero, the thickness becomes the smallest, and the minimum dimension Wc of the spring washer 70 is obtained. Thus, the spring washer 70 is an elastic member having an elastic force as its thickness changes due to compression.

<Mounting method of stator>
As shown in FIGS. 2 to 5, the shaft 51 of the bolt 50 is inserted into the sleeve 40. Then, from the head 52 side of the bolt 50, the second insertion hole 71 of the spring washer 70 and the first insertion hole 61 of the flat washer 60 so that the spring washer 70, the flat washer 60 and the stator 20 are in order. And, the sleeve 40 is inserted into the through hole 26 of the stator 20. As a result, the spring washer 70 abuts on the seat surface 52 a of the flange 54 of the head 52, and the screw 53 of the shaft 51 projects from the stator 20. Then, the stator 20 is attached to the block 17 by fastening the screw portion 53 to the opening 17 d of the block 17.

  Here, as the screw portion 53 is fastened to the block 17, the dimension of the screw portion 53 inserted into the opening 17d becomes longer. Along with this, the dimension between the block 17 and the flange 54 of the bolt 50 is shortened, and the spring washer 70 is compressed between the flange 54 and the iron core 21. Thereby, the spring washer 70 presses the iron core 21 in the stacking direction. However, in the stacking direction, the dimension L of the sleeve 40 is set to satisfy the relationship of LLH + F + Wc with respect to the dimension H of the iron core 21, the dimension F of the flat washer 60 and the minimum dimension Wc of the compressed spring washer 70. It is done.

  For this reason, when the sleeve 40 contacts the block 17 and the flange portion 54, the dimension between the two does not become shorter than H + F + Wc, and the dimension H of the iron core 21 is secured. Thereby, even when the thickness of the magnetic plate 22 of the stator 20 is as thin as 0.2 mm or less and the rigidity is small, the magnetic plate 22 of the iron core 21 is prevented from being broken. Furthermore, since excessive stress is not generated in the iron core 21, it is possible to reduce an increase in iron loss of the stator 20 due to the stress.

  On the other hand, in the stacking direction, the dimension L of the sleeve 40 is set to satisfy the relationship of L <H + F + Wu with respect to the dimension H of the iron core 21, the dimension F of the flat washer 60 and the minimum dimension Wc of the compressed spring washer 70. It is done. Thus, the thickness of the spring washer 70 becomes smaller than the non-compressed dimension Wu with the sleeve 40 in contact with the block 17 and the collar portion 54.

  Thus, the spring washer 70 is compressed to elastically support the stator 20. For this reason, the stator 20 is securely attached to the block 17. Further, the stator 20 is pressed against the surface of the block 17 to be adjusted in angle. The surface of the block 17 is set such that the inner circumferential surface of the stator 20 is parallel to the outer circumferential surface of the rotor 30. As a result, the rotor 30 can rotate without coming into contact with the stator 20, and problems such as noise and damage can be suppressed.

  The flat washer 60 also reduces the surface pressure exerted on the stator 20 from the spring washer 70 between the spring washer 70 and the stator 20. Therefore, the reduction in breakage of the stator 20 and the increase in iron loss can be further reduced.

<Modification 1>
Although the hermetic compressor 10 according to the above-described embodiment includes the flat washer 60, the flat washer 60 may not be provided. In this case, a spring washer 70 is disposed between the stator 20 and the head 52 of the bolt 50 so as to be in contact therewith.

  Then, in the stacking direction, the dimension L of the sleeve 40 is set to satisfy the relationship of LLH + Wc with respect to the dimension H of the iron core 21 of the stator 20 and the minimum dimension Wc of the compressed spring washer 70. As a result, even if the spring washer 70 is compressed to the minimum dimension Wc, the sleeve 40 ensures the dimension H of the iron core 21 and thus can prevent damage to the iron core 21 and an increase in iron loss.

  Further, in the stacking direction, the dimension L of the sleeve 40 is set to satisfy the relationship of L <H + Wu with respect to the dimension H of the iron core 21 of the stator 20 and the non-compressed dimension Wu of the non-compressed spring washer 70. . As a result, the spring washer 70 is compressed, so that the stator 20 is elastically supported by the spring washer 70 and securely attached to the block 17.

<Modification 2>
Although the spring washer 70 is used as an elastic member in the hermetic type compressor 10 of all the above-mentioned embodiments, the elastic member is not limited to this. For example, as the elastic member, a material having elasticity such as a helical spring and rubber may be used.

<Modification 3>
Although the spring washer 70 is disposed between the head 52 and the stator 20 in the hermetic compressor 10 of all the above-described embodiments, the position of the spring washer 70 is not limited to this. For example, the spring washer 70 may be disposed between the stator 20 and the block 17.

<Modification 4>
Although the stator 20 is attached to the block 17 in the sealed compressors 10 according to all the embodiments described above, the part (attachment part) to which the stator 20 is attached is not limited as long as it is inside the enclosed container 12 .

  From the above description, many modifications and other embodiments of the present invention will be apparent to those skilled in the art. Accordingly, the above description should be taken as exemplary only, and is provided for the purpose of teaching those skilled in the art the best mode of carrying out the present invention. The structural and / or functional details may be substantially altered without departing from the spirit of the present invention.

  The hermetic compressor according to the present invention is useful as a hermetic compressor or the like that can suppress deformation of the stator while achieving efficient operation of the motor unit.

10: Hermetic compressor 12: Hermetic container 14: Motor unit 15: Compressor unit 20: Stator 21: Iron core (laminated body)
22: magnetic plate 23: central hole 26: through hole 30: rotor 40: sleeve 50: bolt 51: shaft 52: head 52: bearing surface 52a: screw surface 60: flat washer 70: spring washer (elasticity Element)
71: Second insertion hole (insertion hole)

Claims (6)

A stator having a laminated body in which a plurality of magnetic plates are laminated, and a through-hole portion penetrating in a lamination direction of the laminated body, and a motor unit having a rotor,
A compressor unit driven by the motor unit;
A closed container containing the motor unit and the compressor unit;
A sleeve inserted into the through hole;
The screw has a shaft portion provided with a screw portion and a head provided at one end portion of the shaft portion, and the screw is mounted on a predetermined mounting portion in the sealed container when the shaft portion is inserted into the sleeve A bolt that fastens the stator within the sealed container by fastening the part;
And an elastic member which has an insertion hole into which the sleeve is inserted, and which is compressed as the bolt is fastened to the mounting portion, and which presses the laminated body in the laminating direction.
The hermetic compressor, wherein in the stacking direction, a dimension L of the sleeve satisfies a relationship of L ≧ H + Wc with respect to a dimension H of the stacked body and a minimum dimension Wc of the compressed elastic member.   The sealed type according to claim 1, wherein in the stacking direction, the dimension L of the sleeve satisfies the relationship of L <H + Wu with respect to the dimension H of the stacked body and the non-compressed dimension Wu of the non-compressed elastic member. Compressor.   The hermetic compressor according to claim 1, wherein the sleeve is formed of a nonmagnetic material.   The sealed compressor according to any one of claims 1 to 3, wherein the elastic member is a spring washer.   The sealed compressor according to any one of claims 1 to 4, wherein the elastic member is disposed between the seat surface of the head and the laminate. It further comprises a flat washer disposed between the laminate and the elastic member,
In the stacking direction, the dimension L of the sleeve is H + Wc + F ≦ L <H + Wu + F with respect to the dimension H of the laminate, the minimum dimension Wc and the non-compression dimension Wu of the elastic member, and the dimension F of the flat washer. The hermetic compressor according to any one of claims 1 to 5, which satisfies the relationship.

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