JP4858565B2 - Compressor - Google Patents

Description

  The present invention relates to a compressor that joins a casing and a motor disposed inside the casing by welding at a plurality of welding positions.

Conventionally, various compressors that join a casing and a motor disposed inside the casing by welding have been proposed as methods for fixing the motor to the casing (see, for example, Patent Documents 1 and 2).
JP 2003-262192 A JP 2007-255332 A

However, when the casing and the motor are joined by welding, there is a problem that the stator (core) is distorted due to heat input during welding. For this reason, the air gap formed between the stator (core) and the rotor becomes non-uniform, electromagnetic excitation force applied to the stator increases, and vibration and noise are generated. In particular, as shown in FIG. 15, when welding is performed at a position outside the radial direction of the slot 877, a portion in which the heat related to welding has a small thickness in the radial direction of the core 871 (the radial direction of the slot 877 of the back yoke 875 Since the transmission is centered on the portion A located outside, the distortion of the core 871 becomes large. As shown in FIG. 16, in consideration of the efficiency of the compressor, a portion with a smaller magnetic flux density than a portion A with a larger magnetic flux density (a portion located on the radially outer side of the teeth portion 876 of the back yoke portion 875) B In the prior art, a core cut portion 875b that forms a passage through which refrigerant or oil passes is provided. In general, the pipe 811 and the core 871 are welded by an arc portion 875a that is disposed radially outside the slot 877. It was.
Further, as shown in FIG. 15, when welding is performed at a position outside the slot 877 in the radial direction, heat related to welding is transmitted centering on a portion A of the back yoke portion 875 positioned outside the slot 877 in the radial direction. Therefore, there is a disadvantage that the insulating member disposed in the slot is melted.

  Accordingly, the present invention has been made to solve the above-described problems, and by suppressing distortion of the core, vibration and noise are reduced, and the insulating member disposed in the slot is melted. It aims at providing the compressor which can be suppressed.

According to a first aspect of the present invention, there is provided a compressor in which a casing and a motor disposed in the casing are joined by welding at a plurality of welding positions. The motor includes an annular back yoke portion and the back yoke portion. A plurality of teeth portions projecting radially inward from each other, and a slot formed between the adjacent tooth portions, and between the casing and the back yoke portion and of the back yoke portion. A core cut portion provided at a portion corresponding to the radially outer side of the slot is formed on the outer peripheral surface of the back yoke portion, a coil disposed in the slot, a coil disposed in the slot, and the coil An insulating member that insulates the core, wherein at least one of the plurality of welding positions is an outer peripheral surface of the back yoke portion, and It is characterized in that a portion corresponding to the radially outer side of the Isu portion.

(1) In this compressor, welding is performed at a portion located on the radially outer side of the teeth portion of the back yoke portion (hereinafter abbreviated as “teeth side yoke portion”), so that the heat related to the welding is reduced to the diameter of the core. Since it transmits to a wide range centering on the teeth part which is a part where the thickness of a direction is large, it can control that a core is distorted by the heat concerning welding. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
(2) Moreover, in this compressor, by welding at the teeth side yoke part, the heat by welding is transmitted to a wide range centering on the teeth part. As a result, the amount of heat transferred to the portion of the back yoke portion located radially outside the slot (hereinafter abbreviated as “slot side yoke portion”) is reduced, and the insulating member disposed in the slot is prevented from melting. can do.
(3) Moreover, in this compressor, since welding is performed at the teeth side yoke portion whose magnetic flux density is smaller than that of the slot side yoke portion, it is possible to suppress a decrease in efficiency due to a decrease in the axial insulation of the electromagnetic steel sheet.
(4) In this compressor, since the welding position is arranged on the radially outer side of the tooth portion, when the core is inserted into the casing and the welding position is positioned, the tooth portion becomes a mark and the welding position is Positioning becomes easy.
(5) When the core cut portion is provided, a gap is formed in the portion, so that heat radiation from the core to the outside through the casing is not promoted, and the problem that the insulating member melts becomes significant. For this reason, this invention which can aim at the heat-transfer suppression to an insulating member becomes especially effective.
(6) In the compressor in which the core cut portion is provided in the slot side yoke portion, vibration and noise can be reduced by suppressing the distortion of the core.

  In the compressor according to the second invention, in the compressor according to the first invention, at least one of the plurality of welding positions is arranged on a line connecting the circumferential center of the teeth portion and the center of the core.

  In this compressor, welding is performed at a portion corresponding to the radially outer side of the center in the circumferential direction of the teeth portion, so that heat due to welding spreads uniformly in the teeth portion, so even if the core is distorted, the distortion is uneven. Can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.

  A compressor according to a third aspect of the present invention is the compressor according to the first or second aspect, wherein a gap is provided in the back yoke portion.

  In this compressor, the distortion of the core due to welding can be absorbed by the gap.

  A compressor according to a fourth invention is the compressor according to any one of the first to third inventions, wherein at least one of the portions corresponding to the plurality of welding positions of the back yoke portion has a heat transfer shielding portion. Is provided.

  In this compressor, since heat at the time of welding can be suppressed from being transmitted to the insulating member by the heat transfer shielding portion, it is possible to prevent the insulating member from being melted.

  A compressor according to a fifth aspect of the present invention is the compressor according to the fourth aspect of the present invention, wherein the heat transfer shielding portion is provided between the welding position and the slot close to the welding position.

  In this compressor, the insulating member can be prevented from melting in the slot where heat from the welding position is most easily transferred.

  The compressor concerning 6th invention is a compressor concerning 4th or 5th invention, A heat-transfer shielding part is provided only in the part corresponding to a welding position regarding an up-down direction.

  By providing the heat transfer shielding part, there is an effect of preventing the flow of magnetic flux, but in this compressor, the influence can be minimized by limiting the range in which the heat transfer shielding part is provided.

  A compressor according to a seventh aspect of the present invention is the compressor according to any one of the fourth to sixth aspects, wherein the heat transfer shielding portion extends in a direction intersecting the radial direction in a plan view, and the radial direction thereof. An end portion in a direction intersecting with is tapered or circular.

  Providing a heat transfer shield will affect the flow of magnetic flux, but with this compressor, the end of the heat transfer shield is tapered or circular so that the magnetic flux flows smoothly. Therefore, the influence can be suppressed.

  A compressor according to an eighth invention is the compressor according to any one of the fourth to seventh inventions, wherein the casing is provided with a weld hole in a portion corresponding to a welding position, and in a plan view, the heat transfer shield. The width in the direction intersecting the radial direction of the part is larger than the width in the direction intersecting the radial direction of the weld hole.

  In this compressor, since the heat radiation range related to welding can be covered by the heat transfer shielding portion, a portion where the insulating member may be melted can be covered in a wide range.

  A compressor according to a ninth aspect is the compressor according to any one of the fourth to eighth aspects, wherein a plurality of heat transfer shielding portions are provided at intervals along the radial direction.

  In this compressor, since the surface area of the heat transfer shielding portion is increased, the heat dissipation in the heat transfer shielding portion is increased, and heat transfer to the insulating member can be further suppressed.

  A compressor according to a tenth invention is the compressor according to any one of the fourth to ninth inventions, wherein the heat transfer shielding portion is a gap provided at a position separated from an outer end portion of the back yoke portion. The magnetic flux of the back yoke portion is a portion through which the magnetic flux flows, and the back yoke portion is disposed outside the radial center.

In this compressor, melting of the insulating member can be suppressed with a simple configuration of providing a gap.
Further, in this compressor, by providing the gap, distortion due to thermal expansion or shrinkage stress during welding can be absorbed in the gap, so that deformation of the core can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
Moreover, when the said space | gap becomes a channel | path of oil or a refrigerant | coolant, since the coil is cooled, the efficiency of a compressor improves and the reliability of a coil improves.
Further, since the electromagnetic vibration of the motor can be absorbed by the gap, the vibration transmitted to the casing can be suppressed, and low noise and low vibration can be realized.
Further, in the back yoke portion, the change in the magnetic flux density is smaller at the radially outer portion, and the change in the magnetic flux density is rapidly reduced from the radial center of the back yoke portion toward the outside. Therefore, in this compressor, by arranging the heat transfer shielding portion at a portion outside the center in the radial direction of the back yoke portion, it is possible to suppress the influence of the flow of magnetic flux by the heat transfer shielding portion.
Moreover, it is preferable that the depth (the length in the radial direction) of the gap is not more than half the depth (the length in the radial direction) of the back yoke portion. If comprised in this way, the heat-transfer suppression effect can be acquired, suppressing the influence of the flow of magnetic flux.

  A compressor according to an eleventh aspect is the compressor according to any one of the fourth to ninth aspects, wherein the heat transfer shielding portion is a recess formed in a portion facing the slot of the back yoke portion.

In this compressor, since the insulating member does not come into contact with the back yoke portion by providing the concave portion, the heat due to welding is not directly transmitted to the insulating member, and the insulating member can be further prevented from melting.
Further, in this compressor, by providing the concave portion, distortion due to thermal expansion or shrinkage stress during welding can be absorbed in the concave portion, so that deformation of the core can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
Moreover, when the said recessed part becomes a channel | path of oil or a refrigerant | coolant, since the coil is cooled, the efficiency of a compressor improves and the reliability of a coil improves.
Further, since the electromagnetic vibration of the motor can be absorbed by the recess, vibration transmitted to the casing can be suppressed, and low noise and low vibration can be realized.

  A compressor according to a twelfth aspect is the compressor according to the eleventh aspect, wherein a plurality of recesses are provided for one slot.

  In this compressor, since the insulating member arranged in the slot can be supported by the portion provided between the adjacent concave portions, even if the concave portion is provided, the insulating member is prevented from being arranged in a bent state. can do.

A compressor according to a thirteenth invention is the compressor according to any one of the first to twelfth inventions , wherein a resin is provided between the casing and the back yoke portion.

In this compressor, since it becomes difficult to dissipate heat through the casing by the resin , the effect of suppressing heat transfer can be expected more.

A compressor according to a fourteenth invention is the compressor according to any one of the first to thirteenth inventions, wherein the insulating member is a film.

  Even when a film that melts easily against heat is used, the compressor can prevent the film from melting. As a result, the range of materials that can be used as the insulating member is increased.

A compressor according to a fifteenth invention is the compressor according to any one of the first to fourteenth inventions, wherein the insulating member is permeable to oil and / or refrigerant.

  In this compressor, since the insulating member is cooled by the oil and / or refrigerant that has penetrated into the insulating member, the insulating member can be further prevented from melting.

A compressor according to a sixteenth invention is the compressor according to any one of the first to fifteenth inventions, wherein the insulating member has bubbles inside.

  In this compressor, since the insulating member is cooled by the air bubbles inside the insulating member, the insulating member can be further prevented from melting.

A compressor according to a seventeenth aspect of the present invention is the compressor according to any one of the first to sixteenth aspects, wherein the coil winding method is concentrated winding.

  Compared to distributed winding motors, concentrated winding motors have a problem that the width of the back yoke portion in the radial direction is small and the insulating member melts, so it is possible to suppress heat transfer to the insulating member. The invention is particularly effective for a compressor in which the coil winding method is concentrated.

A compressor according to an eighteenth invention uses a CO ₂ refrigerant in the compressor according to any one of the first to seventeenth inventions.

In a compressor using a CO ₂ refrigerant, the casing and the motor are generally joined by welding at a plurality of welding positions. Therefore, the present invention for suppressing heat transfer to the insulating member uses the CO ₂ refrigerant. This is particularly effective for compressors that have been used.

  As described above, according to the present invention, the following effects can be obtained.

(1) In the first invention, welding is performed at a portion (hereinafter abbreviated as “tooth side yoke portion”) located on the radially outer side of the teeth portion of the back yoke portion, so that the heat related to the welding is Since it transmits to a wide range centering on the teeth part which is a part where the thickness of radial direction is large, it can control that a core distorts with the heat concerning welding. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
(2) Moreover, in 1st invention, the heat by welding is transmitted to a wide range centering on a teeth part by welding in a teeth side yoke part. As a result, the amount of heat transferred to the portion of the back yoke portion located radially outside the slot (hereinafter abbreviated as “slot side yoke portion”) is reduced, and the insulating member disposed in the slot is prevented from melting. can do.
(3) Further, in the first invention, since welding is performed at the teeth side yoke portion whose magnetic flux density is smaller than that of the slot side yoke portion, it is possible to suppress a reduction in efficiency due to a reduction in the insulation in the axial direction of the electromagnetic steel sheet.
(4) In the first invention, since the welding position is arranged on the radially outer side of the tooth portion, when the core is inserted into the casing and the welding position is positioned, the tooth portion becomes a mark and the welding position It becomes easy to position.
(5) When the core cut portion is provided, a gap is formed in the portion, so that heat radiation from the core to the outside through the casing is not promoted, and the problem that the insulating member melts becomes significant. For this reason, this invention which can aim at the heat-transfer suppression to an insulating member becomes especially effective.
(6) In the compressor in which the core cut portion is provided in the slot side yoke portion, vibration and noise can be reduced by suppressing the distortion of the core.

  Further, in the second invention, by performing welding at a portion corresponding to the radially outer side of the center in the circumferential direction of the tooth portion, heat due to welding spreads uniformly in the tooth portion, so even if the core is distorted, the distortion is Nonuniformity can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.

  In the third invention, the distortion of the core due to welding can be absorbed by the gap.

  Moreover, in the fourth invention, the heat transfer shielding portion can suppress the heat at the time of welding from being transmitted to the insulating member, so that the insulating member can be prevented from melting.

  In the fifth invention, the insulating member can be prevented from melting in the slot where heat from the welding position is most easily transferred.

  Further, in the sixth invention, by limiting the range in which the heat transfer shielding portion is provided, the influence can be minimized.

  Moreover, in 7th invention, a magnetic flux comes to flow smoothly by making the edge part of a heat-transfer shielding part into a tapered shape or circular shape, and the influence can be suppressed.

  Further, in the eighth invention, since the heat radiation range related to welding can be covered with the heat transfer shielding portion, it is possible to cover a wide range of locations where the insulating member may melt.

  In the ninth invention, since the surface area of the heat transfer shielding portion is increased, the heat dissipation in the heat transfer shielding portion is increased, and the heat transfer to the insulating member can be further suppressed.

In the tenth invention, the insulating member can be prevented from melting with a simple configuration in which a gap is provided.
Further, in this compressor, by providing the gap, distortion due to thermal expansion or shrinkage stress during welding can be absorbed in the gap, so that deformation of the core can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
Moreover, when the said space | gap becomes a channel | path of oil or a refrigerant | coolant, since the coil is cooled, the efficiency of a compressor improves and the reliability of a coil improves.
Further, since the electromagnetic vibration of the motor can be absorbed by the gap, the vibration transmitted to the casing can be suppressed, and low noise and low vibration can be realized.
Further, in the back yoke portion, the change in the magnetic flux density is smaller at the radially outer portion, and the change in the magnetic flux density is rapidly reduced from the radial center of the back yoke portion toward the outside. Therefore, in this compressor, by arranging the heat transfer shielding portion at a portion outside the center in the radial direction of the back yoke portion, it is possible to suppress the influence of the flow of magnetic flux by the heat transfer shielding portion.
Moreover, it is preferable that the depth (the length in the radial direction) of the gap is not more than half the depth (the length in the radial direction) of the back yoke portion. If comprised in this way, the heat-transfer suppression effect can be acquired, suppressing the influence of the flow of magnetic flux.

In the eleventh aspect of the present invention, since the insulating member does not come into contact with the back yoke portion by providing the recess, heat from welding is not directly transferred to the insulating member, and the insulating member is prevented from melting further. Can do.
Further, in this compressor, by providing the concave portion, distortion due to thermal expansion or shrinkage stress during welding can be absorbed in the concave portion, so that deformation of the core can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
Moreover, when the said recessed part becomes a channel | path of oil or a refrigerant | coolant, since the coil is cooled, the efficiency of a compressor improves and the reliability of a coil improves.
Further, since the electromagnetic vibration of the motor can be absorbed by the recess, vibration transmitted to the casing can be suppressed, and low noise and low vibration can be realized.

  In the twelfth invention, since the insulating member disposed in the slot can be supported by the portion provided between the adjacent concave portions, the insulating member is disposed in a bent state even if the concave portion is provided. Can be prevented.

In the thirteenth aspect , the resin makes it difficult to dissipate heat through the casing, so that a heat transfer suppression effect can be expected more.

In the fourteenth invention, the film can be prevented from melting. As a result, the range of materials that can be used as the insulating member is increased.

In the fifteenth aspect , since the insulating member is cooled by the oil and / or refrigerant that has penetrated into the insulating member, the insulating member can be further prevented from melting.

In the sixteenth aspect , since the insulating member is cooled by the air bubbles inside the insulating member, it is possible to further suppress melting of the insulating member.

In the seventeenth invention, the coil winding method is particularly effective for a concentrated winding compressor.

The eighteenth aspect of the invention is particularly effective for a compressor using a CO ₂ refrigerant.

Hereinafter, an embodiment of a rotary compressor for a CO ₂ refrigerant according to the present invention will be described based on the drawings.

(First embodiment)
FIG. 1 is a sectional view showing the internal structure of a rotary compressor for CO ₂ refrigerant according to the first embodiment of the present invention. FIG. 2 is a horizontal sectional view of the compressor. FIG. 3 is a plan view of the motor. FIG. 4 is a plan view of the core. FIG. 5 is a partially enlarged view of the stator. Hereinafter, with reference to FIGS. 1-5, the compressor 1 which concerns on 1st Embodiment of this invention is demonstrated in detail.

<Overall configuration of rotary compressor>
As shown in FIG. 1, the rotary compressor 1 according to the first embodiment is a two-cylinder rotary compressor, and includes a sealed casing 10, a motor 20 and a compression mechanism 30 disposed in the sealed casing 10, And an accumulator 40 disposed on the side of the hermetic casing 10. The rotary compressor 1 is a so-called high-pressure dome type compressor and uses a CO ₂ refrigerant (hereinafter abbreviated as a refrigerant). In the rotary compressor 1, the compression mechanism 30 is disposed below the motor 20 in the sealed casing 10. In addition, lubricating oil 50 supplied to each sliding portion of the compression mechanism 30 is stored in the lower portion of the hermetic casing 10.

<Sealed casing>
The hermetic casing 10 includes a pipe 11, a top 12, and a bottom 13. The pipe 11 is a substantially cylindrical member extending in the vertical direction, and the upper and lower ends thereof are open. Further, two connection ports 11a and 11b for introducing inlet tubes 43a and 43b, which will be described later, into the inside of the sealed casing 10 are formed on the side surface of the pipe 11 in the vertical direction. And the cylindrical joint pipes 14a and 14b holding the inlet tubes 43a and 43b are joined to the inner peripheral surfaces of the connection ports 11a and 11b, respectively. The top 12 is a member that closes the opening at the upper end of the pipe 11. A discharge pipe 15 for discharging the high-temperature and high-pressure refrigerant compressed by the compression mechanism 30 to the outside of the sealed casing 10 is attached to the top 12. The top 12 is provided with a terminal terminal 16 connected to the motor 20. The bottom 13 is a member that closes the opening at the lower end of the pipe 11. In the sealed casing 10 having the above-described configuration, a sealed space surrounded by the pipe 11, the top 12, and the bottom 13 is formed.

In this embodiment, the motor 20 is arrange | positioned inside the pipe 11, and as shown in FIG. 2, the pipe 11 and the motor 20 are joined by spot welding in three welding positions P1-P3. The pipe 11 is provided with welding holes 10a to 10c at respective portions corresponding to the three welding positions P1 to P3. The welding positions P1 to P3 and the welding holes 10a to 10c are provided at an interval of about 120 degrees in the circumferential direction (R direction). In the compressor 1 using the CO ₂ refrigerant, the pipe 11 and the motor 20 are generally fixed by welding.

<Motor>
The motor 20 is a concentrated winding motor in which a coil 72 of each phase (U phase, V phase, W phase) is wound around a tooth portion 76 of a core 71. The motor 20 is provided to drive a compression mechanism 30 disposed below the motor 20. As shown in FIG. 3, the rotor 60 and a radially outer side of the rotor 60 via an air gap are provided. And a stator 70 to be arranged.

<Rotor>
The rotor 60 has a core 61 and a plurality of permanent magnets 62. The core 61 is formed by laminating a plurality of thin plates made of a metal material and joining them together by welding or the like. The core 61 is formed with a substantially circular through hole 63 at a substantially central portion in plan view. The upper end portion of the shaft 80 is inserted into the through hole 63, and the shaft 80 is fixed to the core 61.

<Stator>
2 and 3, the stator 70 has a core 71, a coil 72, a slot cell (insulating member) 73, and insulators 74a and 74b (see FIG. 1).

<Core>
The core 71 is formed by laminating a plurality of thin plates made of a metal material and joining them together by welding or the like. As shown in FIG. 4, the core 71 includes an annular back yoke portion 75, nine tooth portions 76 projecting inward in the radial direction (X direction) from the back yoke portion 75, and adjacent tooth portions 76. And nine slots 77 formed between the two. A through hole H extending in the vertical direction is formed in a substantially central portion of the core 71. Inside the through hole H, the above-described rotor 60 (see FIG. 3) is arranged. Note that in the motor 20 in which the winding method of the coil 72 is concentrated winding, the back yoke portion 75 described above has a smaller radial (X direction) width than the motor in which the coil winding method is distributed winding. ing.

  On the outer peripheral surface of the back yoke portion 75, arc portions 75a that contact the inner peripheral surface of the pipe 11 and core cut portions 75b that do not contact the inner peripheral surface of the pipe 11 alternate along the circumferential direction (R direction). Placed in. The arc portion 75a is formed in a curved surface shape along the inner peripheral surface of the pipe 11, and the core cut portion 75b is formed in a flat surface shape. Here, in the present embodiment, as shown in FIGS. 4 and 5, the tooth portion 76 is provided inside the radial direction (X direction) of the arc portion 75a, and the radial direction (X direction) of the core cut portion 75b. A slot 77 is provided on the inside. And the welding positions P1-P3 (refer FIG. 2) mentioned above are arrange | positioned at the circular arc part 75a contact | abutted to the internal peripheral surface of the pipe 11. FIG. On the other hand, a gap Q serving as a refrigerant or oil passage is formed between the core cut portion 75b and the inner peripheral surface of the pipe 11 as shown in FIG.

  If the efficiency of the compressor 1 is taken into consideration, the portion of the back yoke 75 that is located on the radially outer side of the teeth portion 76 (hereinafter abbreviated as “tooth yoke”) C (see FIG. 5) contains refrigerant or oil. Generally, a core cut portion 75b that forms a passage is provided (see FIGS. 15 and 16). In the present embodiment, a circular arc portion 75a is provided in the tooth side yoke portion C, and a slot of the back yoke portion 75 is provided. A core cut portion 75 b is provided in a portion D (hereinafter abbreviated as “slot side yoke portion”) D located on the radially outer side of 77. In the present embodiment, the welding positions P <b> 1 to P <b> 3 are arranged on the outer circumferential surface of the back yoke part 75 and on the arc part 75 a located outside the radial direction (X direction) of the tooth part 76. Specifically, as shown in FIG. 2, the welding positions P <b> 1 to P <b> 3 connect the center in the circumferential direction (R direction) of the tooth portion 76 and the center of the core 71 (rotation center of the rotor 60) G, respectively. Arranged on the lines L1 to L3.

  A coil 72 of each phase (U phase, V phase, W phase) is wound around each of the nine teeth portions 76. Specifically, the coils 72 of each phase of the U phase, the V phase, and the W phase are wound around the teeth portion 76 in order along the circumferential direction (R direction).

  Each of the nine slots 77 penetrates the core 71 in the vertical direction (Z direction). Each of the nine slots 77 communicates with the through hole H through an opening 77a (see FIG. 5) formed between the tips of the adjacent tooth portions 76. The coil 72 described above is wound around each tooth portion 76 by a nozzle (not shown) of a winding machine inserted into the slot 77 through the opening 77a.

  As shown in FIG. 5, a slot cell 73 for insulating the tooth portion 76 and the coil 72 is inserted into the slot 77. The slot cell 73 is a film made of PET (polyethylene terephthalate). The slot cell 73 is arranged along the shape of the slot 77.

<Shaft>
As shown in FIG. 1, the shaft 80 rotates with the rotor 60 described above, thereby rotating the pistons 34 and 37 of the compression mechanism 30. The shaft 80 is provided with an eccentric portion 81 so as to be positioned in a cylinder chamber T1 of the front cylinder 33 described later, and is provided with an eccentric portion 82 so as to be positioned in a cylinder chamber T2 of the rear cylinder 36. . Pistons 34 and 37 are attached to the eccentric parts 81 and 82, respectively, and the piston 34 attached to the eccentric part 81 rotates in the cylinder chamber T1 as the shaft 80 rotates and the eccentric part 82. The piston 37 mounted on the cylinder rotates in the cylinder chamber T2. The eccentric portion 81 and the eccentric portion 82 are disposed at positions shifted by 180 ° in the rotation direction of the shaft 80.

<Compression mechanism>
As shown in FIG. 1, the compression mechanism 30 includes a front muffler 31, a front head 32, and a front cylinder 33 having a double structure from the top to the bottom along the rotation axis of the shaft 80 of the motor 20. And a piston 34, a middle plate 35, a rear cylinder 36 and a piston 37, a rear head 38, and a rear muffler 39.

  The front muffler 31 silences the refrigerant discharged from a discharge port (not shown) provided in the front head 32 and discharges it to the primary space. The front muffler 31 is attached to the front head 32.

  The front head 32 is joined to the upper surface of the front cylinder 33 and closes the opening at the upper end of the cylinder chamber T1. The front head 32 is provided with a discharge port (not shown) for discharging the refrigerant compressed in the cylinder chamber T1 to the muffler space M formed by the front muffler 31 described above.

  The front cylinder 33 is provided with a cylinder chamber T1 at the center thereof. In the cylinder chamber T1, a piston 34 that moves eccentrically with the rotation of the shaft 80 is disposed. The cylinder chamber T1 communicates with the muffler space M through the above-described discharge port. Therefore, the refrigerant compressed by the eccentric rotational movement of the piston 34 attached to the eccentric portion 81 of the shaft 80 is guided from the cylinder chamber T1 to the muffler space M.

  The piston 34 performs an eccentric rotational movement along the inner peripheral surface of the cylinder chamber T1, and compresses the refrigerant sucked from the accumulator 40.

  The middle plate 35 is disposed between the front cylinder 33 and the rear cylinder 36. The middle plate 35 closes the opening below the cylinder chamber T1 of the front cylinder 33 and closes the opening above the cylinder chamber T2 of the rear cylinder 36.

  The rear cylinder 36, the piston 37, the rear head 38, and the rear muffler 39 are the same as the front cylinder 33, the piston 34, the front head 32, and the front muffler 31, respectively, in view of their functions. The refrigerant compressed in the cylinder chamber T2 of the rear cylinder 36 passes through a muffler space (not shown) formed by the rear head 38 and the rear muffler 39, and then the rear head 38, the rear cylinder 36, the middle plate 35, and the front The air is guided to the muffler space M through a communication hole (not shown) communicating with the cylinder 33 and an introduction port (not shown) formed in the front head 32.

<Accumulator>
The accumulator 40 is provided to supply refrigerant from the outside of the hermetic casing 10 to each of the cylinder chamber T1 of the front cylinder 33 and the cylinder chamber T2 of the rear cylinder 36 disposed therein. As shown in FIG. 1, the accumulator 40 includes an inlet pipe 41 extending in the vertical direction and two outlet pipes 42a and 42b bent in a substantially L shape. Thereby, the refrigerant flowing in from the inlet pipe 41 passes through the outlet pipes 42a and 42b and is supplied to the cylinder chambers T1 and T2, respectively.

  And the substantially cylindrical inlet tubes 43a and 43b are connected to the front-end | tip of each of the exit pipes 42a and 42b. The inlet tubes 43a and 43b are connected to cylinders 33 and 36 via joint pipes 14a and 14b joined to the sealed casing 10, respectively.

[Characteristics of Compressor of this Embodiment]
The compressor 1 of this embodiment has the following characteristics.

  In the compressor 1 of the present embodiment, by performing welding at the teeth side yoke portion C, heat related to welding is transmitted over a wide range around the teeth portion 76 which is a portion having a large radial thickness of the core 71. The distortion of the core 71 is reduced. Thereby, the air gap between the rotor 60 and the core 71 disposed inside the core 71 becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.

  Further, in the compressor 1 according to the present embodiment, welding is performed at the teeth side yoke portion C, so that heat due to welding is transmitted over a wide range around the teeth portion 76. As a result, the amount of heat transmitted to the slot-side yoke portion D is reduced, and the slot cell 73 disposed in the slot 77 can be prevented from melting.

  Moreover, in the compressor 1 of this embodiment, since the teeth side yoke part C has a smaller magnetic flux density than the slot side yoke part D, the insulation in the axial direction of the electrical steel sheet is lowered when the teeth side yoke part C is welded. It is possible to suppress a decrease in efficiency due to.

  Moreover, in the compressor 1 of this embodiment, since the welding position is arranged on the radially outer side of the tooth portion 76, when inserting the core 71 into the BR> P casing and positioning the welding position, the tooth portion 76 becomes a mark and positioning of a welding position becomes easy.

  Moreover, in the compressor 1 of this embodiment, since the heat by welding spreads uniformly in the teeth part 76 by welding in the part corresponding to the radial direction center of the circumferential direction center of the teeth part 76, the core 71 is distorted. Even so, the distortion can be suppressed from becoming non-uniform. Thereby, the air gap between the rotor 60 and the core 71 disposed inside the core 71 becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.

  Further, in the compressor 1 of the present embodiment, even if the slot cell 73 of a film that is easily melted by heat is used, the heat transfer to the slot cell 73 can be suppressed. The width expands.

  Further, in the compressor 1 having the core cut portion 75b, the gap Q is formed between the core cut portion 75b and the pipe 11, so that the heat radiation from the core 71 to the outside through the pipe 11 is not promoted and the slot cell. Since the problem that the 73 melts remarkably appears, the compressor 1 capable of suppressing the heat transfer to the slot cell 73 is particularly effective.

  Further, in the compressor 1 in which the winding method of the coil 72 is concentrated winding, the problem that the slot cell melts due to the smaller radial width (X direction) of the back yoke portion than the distributed winding motor appears. Therefore, this compressor 1 capable of suppressing heat transfer to the slot cell 73 is particularly effective.

Further, in the compressor 1 using the CO ₂ refrigerant, since the pipe 11 and the motor 20 are generally joined by welding, the compressor 1 for suppressing heat transfer to the slot cell 73 is particularly effective. Become.

(Reference example)
FIG. 6 is a partially enlarged view of a stator according to a reference example of the present invention. Next, a stator 170 according to a reference example of the present invention will be described in detail with reference to FIG. Note that this reference example is the same as the first embodiment except that the shape of the core 171 is changed, and therefore the description thereof is omitted as appropriate.

<Core>
The core 171 is formed by laminating a plurality of thin plates made of metal materials and joining them together by welding or the like. As shown in FIG. 6, the core 171 includes an annular back yoke portion 175, a plurality of tooth portions 176 that protrude radially inward (X direction) from the back yoke portion 175, and adjacent tooth portions 176. And a slot 177 formed therebetween.

On the outer peripheral surface of the back yoke portion 175, arc portions 175a that contact the inner peripheral surface of the pipe 11 and core cut portions 175b that do not contact the inner peripheral surface of the pipe 11 alternate along the circumferential direction (R direction). Placed in. In this reference example , unlike the first embodiment, a slot 177 is provided inside the arc portion 175a in the radial direction (X direction), and a teeth portion 176 is arranged inside the core cut portion 175b in the radial direction (X direction). Provided. And in this reference example , the welding position P11 is arrange | positioned at the core cut part 175b located in the outer side of the radial direction (X direction) of the teeth part 176. FIG. And in order to enable welding in the core cut part 175b, a convex part 175c protruding outward in the radial direction (X direction) from the core cut part 175b is provided, and the convex part 175c is provided on the pipe 11. It arrange | positions in the welding hole 10a.

[Characteristics of the compressor of this reference example ]
The compressor of this reference example has the following characteristics.

  Even when the core cut portion 175b is provided in the portion corresponding to the outside in the radial direction (X direction) of the teeth portion 176 having a small magnetic flux density in order to suppress the performance degradation, the teeth side yoke portion C11 is provided by providing the convex portion 175c. Welding becomes possible. Therefore, it is possible to suppress the core 171 from being distorted by the heat related to welding while suppressing the performance deterioration due to the provision of the core cut portion 175b.

(Second Embodiment)
FIG. 7 is a partially enlarged view of the stator according to the second embodiment of the present invention. Next, with reference to FIG. 7, the stator 270 which concerns on 2nd Embodiment of this invention is demonstrated in detail. The second embodiment is the same as the first embodiment except that the air gap S21 is provided in the back yoke portion 275 of the core 271. Therefore, the description thereof is omitted as appropriate.

<Core>
The core 271 is formed by laminating a plurality of thin plates made of metal materials and joining them together by welding or the like. As shown in FIG. 7, the core 271 includes an annular back yoke portion 275, a plurality of teeth portions 276 projecting inward in the radial direction (X direction) from the back yoke portion 275, and adjacent tooth portions 276. And a slot 277 formed therebetween.

  On the outer peripheral surface of the back yoke portion 275, arc portions 275a that contact the inner peripheral surface of the pipe 11 and core cut portions 275b that do not contact the inner peripheral surface of the pipe 11 alternate along the circumferential direction (R direction). Placed in. The arc portion 275a is formed in a curved shape along the inner peripheral surface of the pipe 11, and the core cut portion 275b is formed in a flat surface shape. In the present embodiment, the tooth portion 276 is provided inside the radial direction (X direction) of the arc portion 275a, and the slot 277 is provided inside the radial direction (X direction) of the core cut portion 275b. And the welding position P21 is arrange | positioned at the circular arc part 275a contact | abutted to the internal peripheral surface of the pipe 11. FIG. On the other hand, a gap Q is formed between the core cut part 275b and the inner peripheral surface of the pipe 11. In the present embodiment, the welding position P <b> 21 is disposed on the outer circumferential surface of the back yoke portion 275 and on the arc portion 275 a located outside the radial direction (X direction) of the tooth portion 276.

In the second embodiment, a substantially rectangular parallelepiped gap (heat transfer shielding portion) S21 is provided in each portion corresponding to the welding position P21 of the back yoke portion 275. The gap S21 is provided at a position spaced from the outer end of the back yoke portion 275, and is provided between the welding position P21 and the slot 277 adjacent to the welding position P21. In the third embodiment, since the slots 277 (277a and 277b) close to the welding position P21 are provided on both sides of the tooth portion 276 close to the welding position P21, the gap S21 is formed at the welding position P21. And a position between the welding position P21 and the slot 277b.

  In plan view, the gap S21 extends in a direction (Y direction) orthogonal to the radial direction (X direction), and the width L21 in the longitudinal direction (Y direction) of the gap S21 is the Y direction of the weld hole 10a. Is larger than the opening width L2.

  Furthermore, in the present embodiment, the air gap S21 is provided in a portion outside the center of the back yoke portion 275 in the radial direction (X direction) (center line CL in FIG. 5). As shown in FIG. 8, the change in the magnetic flux density is smaller in the radially outer portion of the back yoke portion 275 where the gap S21 is provided than in the radially inner portion of the back yoke portion 275. That is, in this embodiment, the air gap S21 is provided in a portion outside the center in the radial direction of the back yoke portion 275 where the change in magnetic flux density is small. The center line CL is a line that passes through the center in the radial direction (X direction) of the back yoke portion 275 in the arc portion 275a. Here, the entire space S21 is provided in a portion outside the center of the back yoke portion 275, but the present invention is not limited to this, and the space S21 is a portion whose center is outside the center of the back yoke portion 275. You may form so that it may be located in. The depth (the length in the radial direction (X direction)) of the gap S21 is less than or equal to half the depth (the length in the radial direction (X direction)) of the back yoke portion 275. If comprised in this way, the heat-transfer suppression effect can be acquired, suppressing the influence of the flow of magnetic flux.

  Further, as shown in FIG. 9, each of the gaps S <b> 21 is provided only in a portion corresponding to the welding position P <b> 21 in the vertical direction (Z direction). That is, the space | gap S21 is provided only in the same height position as the welding position P21, respectively.

[Characteristics of Compressor of this Embodiment]
The compressor of this embodiment has the following features.

  In the compressor of the present embodiment, by providing the gap S21 in the back yoke portion 275, distortion due to thermal expansion or shrinkage stress during welding can be absorbed in the gap S21, so that deformation of the core 271 can be reduced. Can do. Thereby, the air gap between the rotor arranged inside the core 271 and the core 271 becomes uniform, and the magnetic flux can be prevented from becoming unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.

  Moreover, in the compressor of this embodiment, since the electromagnetic vibration of a motor can be absorbed by the said space | gap S21, it becomes possible to suppress the vibration transmitted to the pipe 11, and can implement | achieve low noise and low vibration.

  Further, in the compressor of the present embodiment, by providing the gap S <b> 21 in the portion corresponding to the welding position P <b> 21 of the back yoke part 275, it is possible to suppress the transfer of heat during welding to the slot cell 73. Thereby, it is possible to prevent the slot cell 73 from melting.

  In the compressor according to the present embodiment, the gap S21 is provided between the welding position P21 and the slots 277a and 277b adjacent to the welding position P21, so that the heat from the welding position P21 is most easily transferred. And 277b, the slot cell 73 can be prevented from melting.

  Moreover, in the compressor of this embodiment, the space | gap S21 is provided in only the part corresponding to the welding position P21 regarding the up-down direction (Z direction), and by providing the space | gap S21 by limiting the range which provides the space | gap S21. The effect of preventing the flow of magnetic flux can be minimized.

  Moreover, in the compressor of this embodiment, the heat | fever which concerns on welding is made by making width L21 of the direction (Y direction) orthogonal to the radial direction (X direction) of space | gap S21 larger than the width L2 of the Y direction of the welding hole 10a. Can be covered with the gap S21, so that a portion where the slot cell 73 may be melted can be covered over a wide range.

  In the compressor of this embodiment, the influence of the flow of the magnetic flux by the air gap S21 can be suppressed by arranging the air gap S21 in a portion outside the radial center of the back yoke part 275 where the change in the magnetic flux density is small. it can.

  Moreover, in the compressor of this embodiment, since the electromagnetic vibration of the motor 20 can be absorbed by the gap S21, vibration transmitted to the sealed casing 10 can be suppressed, and low noise and low vibration can be realized. .

  Moreover, in the compressor 1 of this embodiment, it can suppress that the slot cell 73 melts by the simple structure of providing the space | gap S21, without using the special member which shields heat transfer.

(Modification)
Figure 10 is a partially enlarged view of a stator according to a first modification of the second embodiment of the present invention, FIG. 11 is a partial enlargement of the stator according to a second modification of the second embodiment of the present invention FIG. In the second embodiment described above, the example in which the substantially rectangular parallelepiped gap S21 is provided in the back yoke portion 275 has been described. However, the present invention is not limited thereto, and the first modification of the second embodiment shown in FIG. Like the stator 370, the gap S31 formed in the back yoke portion 375 may be formed so that both ends in the Y direction are tapered. In addition, you may form so that the said both ends may become circular shape. If comprised in this way, magnetic flux will flow smoothly and the influence that the flow of magnetic flux will be prevented by providing space | gap (heat-transfer shielding part) S31 can be suppressed.

Also, as in the stator 470 according to a second modification of the second embodiment shown in FIG. 12, at a predetermined distance along the air gap S41 that is formed in the back yoke portion 475 in the radial direction (X-direction) A plurality of them may be provided. If comprised in this way, the surface area of space | gap S41 can be enlarged compared with the case where one space | gap is used. Thereby, the heat dissipation in the said space | gap S41 increases, and the heat transfer to the slot cell 73 can be suppressed more.

( Third embodiment)
FIG. 12 is a partially enlarged view of a stator according to the third embodiment of the present invention. Next, with reference to FIG. 12, the stator 570 which concerns on 3rd Embodiment of this invention is demonstrated in detail. In the third embodiment, the configuration other than the heat transfer shielding portion provided on the back yoke portion 575 of the core 571 is the same as that of the second embodiment, and thus the description thereof is omitted as appropriate.

<Core>
The core 571 is formed by laminating a plurality of thin plates made of a metal material and joining them together by welding or the like. As shown in FIG. 12, the core 571 includes an annular back yoke portion 575, a plurality of tooth portions 576 projecting inward in the radial direction (X direction) from the back yoke portion 575, and adjacent tooth portions 576. And a slot 577 formed therebetween.

  On the outer peripheral surface of the back yoke portion 575, arc portions 575a that contact the inner peripheral surface of the pipe 11 and core cut portions 575b that do not contact the inner peripheral surface of the pipe 11 alternate along the circumferential direction (R direction). Placed in. Here, in the present embodiment, a tooth portion 576 is provided on the inner side in the radial direction (X direction) of the arc portion 575a, and a slot 577 is provided on the inner side in the radial direction (X direction) of the core cut portion 575b. And the welding position P51 is arrange | positioned at the circular arc part 575a contact | abutted to the internal peripheral surface of the pipe 11. FIG. On the other hand, a gap Q is formed between the core cut portion 575b and the inner peripheral surface of the pipe 11. In the present embodiment, the welding position P51 is disposed on the outer peripheral surface of the back yoke portion 575 and on the arc portion 575a located outside the teeth portion 576 in the radial direction (X direction).

Here, in this embodiment, a portion corresponding to the welding position P51 of the back yoke portion 575 and facing the slot 577 of the back yoke portion 575 has a substantially rectangular parallelepiped concave portion (heat transfer shielding portion) S51. Is provided. The recess S51 is a position spaced from the outer end of the back yoke portion 575, and is provided between the welding position P51 and the slot 577 adjacent to the welding position P51. That is, in this embodiment, since the slots 577 (577a and 577b) close to the welding position P51 are provided on both sides of the tooth portion 576 close to the welding position P51, the recess S51a is connected to the welding position P51. The recess S51b is provided between the welding position P51 and the slot 577b while being provided between the slot 577a.
In the present embodiment, the slot cell (insulating member) does not come into contact with the back yoke portion 575 by providing the recess S51 in the portion of the back yoke portion 575 facing the slot 577, so that heat from welding is directly transmitted to the slot cell. Therefore, it is possible to further suppress melting of the slot cell.
Furthermore, by providing the concave portion S51, distortion due to thermal expansion or contraction stress during welding can be absorbed in the concave portion S51, so that deformation of the core can be reduced. Thereby, the air gap between the rotor arranged inside the core and the core becomes uniform, and the magnetic flux can be prevented from being unbalanced. As a result, generation of electromagnetic excitation force can be suppressed and generation of vibration and noise due to the vibration can be suppressed.
In addition, when the recess S51 serves as a passage for oil or refrigerant, the coil is cooled, so that the efficiency of the compressor is improved and the reliability of the coil is improved.
In addition, since the electromagnetic vibration of the motor can be absorbed by the recess S51, the vibration transmitted to the casing can be suppressed, and low noise and low vibration can be realized.

(Modification)
Figure 13 is a partially enlarged view of a stator according to a first modification of the third embodiment of the present invention, FIG. 14 is a partial enlargement of the stator according to a second modification of the third embodiment of the present invention FIG. In the above-described third embodiment, the example in which the substantially rectangular parallelepiped concave portion S51 (S51a and S51b) is provided has been described. However, the present invention is not limited to this, and the first modification of the third embodiment shown in FIG. Like the stator 670, both end portions in the Y direction are provided with tapered recesses S 61 a between the welding position P 61 and the slot 677 a, and both end portions in the Y direction are provided with tapered recesses S 61 b at the welding position P 61. And the slot 677b.

Moreover, you may provide two recessed parts with respect to one slot like the stator 770 which concerns on the 2nd modification of 3rd Embodiment shown in FIG. In the second modification, two recesses S71a and S71b are provided for the slot 777a disposed on one side of the tooth portion 776, and two recesses are provided for the slot 777b disposed on the other side of the tooth portion 776. S71c and S71d are provided. And convex part S71e is formed between recessed part S71a and S71b by providing recessed part S71a and S71b at predetermined intervals. Similarly, by providing the recesses S71c and S71d at a predetermined interval, a projection S71f is formed between the recesses S71c and S71d. Accordingly, the slot cells 73 arranged in the slots 777a and 777b can be supported by the convex portions S71e and 71f so as not to bend. As a result, it is possible to prevent the slot cell 73 from being arranged in a bent state.

  As mentioned above, although embodiment of this invention was described based on drawing, it should be thought that a specific structure is not limited to these embodiment. The scope of the present invention is shown not only by the above description of the embodiments but also by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example in which the present invention is applied to a two-cylinder compressor has been described. However, the present invention is not limited to this, and may be applied to a one-cylinder compressor or a compressor having three or more cylinders. The present invention is applicable.

In the above embodiment has described a compressor utilizing CO ₂ refrigerant, the present invention is not limited to this, also to the compressor utilizing a refrigerant other than the CO ₂ refrigerant can be applied to the present invention.

  Moreover, although the example using the slot cell of the film which consists of PET was shown in the said embodiment, this invention is not limited to this, The material of a slot cell is not limited to PET. A slot cell that is permeable to oil and / or refrigerant may also be used. In this case, since the slot cell is cooled by the oil and / or refrigerant that has penetrated into the slot cell, it is possible to further suppress melting of the slot cell. Moreover, you may use the slot cell which has a bubble inside. In this case, since the slot cell is cooled by bubbles inside the slot cell, it is possible to suppress melting of the slot cell.

  In the above-described embodiment, an example in which a coil winding system uses a concentrated winding motor has been described. However, the present invention is not limited to this, and the coil winding system can be applied to a distributed winding motor.

  Moreover, in the said embodiment, although the clearance gap was formed between the casing and the back yoke part by forming a core cut part in the outer peripheral surface of a back yoke part, this invention is not limited to this, A core cut part is formed. You may form a clearance gap between a casing and a back yoke part other than the method of forming. Further, a resin may be provided between the casing and the back yoke portion. If comprised in this way, since it will become difficult to radiate heat through a casing, the heat-transfer inhibitory effect can be anticipated more.

  Moreover, although the said embodiment demonstrated the example which the clearance gap S21 extended in the direction (Y direction) orthogonal to radial direction (X direction) in planar view, this invention is not limited to this, The said clearance gap S21 is It suffices if it extends in a direction intersecting the radial direction (X direction).

  If the present invention is used, a compressor capable of reducing vibration and noise by suppressing distortion of the core can be obtained.

It is a sectional view showing the internal structure of the CO ₂ refrigerant rotary compressor according to a first embodiment of the present invention. It is a horizontal sectional view of a compressor. It is a top view of a motor. It is a top view of a core. It is the elements on larger scale of a stator. It is the elements on larger scale of the stator which concerns on the reference example of this invention. It is the elements on larger scale of the stator which concerns on 2nd Embodiment of this invention. It is the graph which showed the change of magnetic flux density in each position of a back yoke part. It is the schematic cross section of the motor and pipe which showed the positional relationship of a welding position and a space | gap. It is the elements on larger scale of the stator which concerns on the 1st modification of 2nd Embodiment of this invention. It is the elements on larger scale of the stator which concerns on the 2nd modification of 2nd Embodiment of this invention. It is the elements on larger scale of the stator which concerns on 3rd Embodiment of this invention. It is the elements on larger scale of the stator which concerns on the 1st modification of 3rd Embodiment of this invention. It is the elements on larger scale of the stator which concerns on the 2nd modification of 3rd Embodiment of this invention. It is the elements on larger scale of the stator which concerns on an example of the past. It is the graph compared with the magnetic flux density of a teeth side yoke part, and the magnetic flux density of a slot side yoke part.

1 Compressor 11 Pipe (casing)
20 Motor 71, 171, 271, 571 Core 72 Coil 73 Slot cell (insulating member)
75,175,275,375,475,575 Back yoke part 76,176,276,576 Teeth part 77,177,277 (277a, 277b), 577 slot S21, S31, S41 Air gap (heat transfer shielding part)
S51 (S51a, S51b), S61a, S61b, S71a, S71b, S71c, S71d Recess (heat transfer shielding part)
S71e, S71f Convex part P1, P2, P3, P11, P21, P51 Welding position

Claims (18)

In a compressor that joins a casing and a motor arranged inside the casing by welding at a plurality of welding positions,
The motor is
An annular back yoke portion, a plurality of teeth portions projecting radially inward from the back yoke portion, and a slot formed between the adjacent tooth portions, and the casing and the back yoke portion A core formed on the outer peripheral surface of the back yoke portion, and a core cut portion provided in a portion corresponding to the outer side in the radial direction of the slot of the back yoke portion ,
A coil disposed in the slot;
An insulating member disposed in the slot and insulating the coil and the core;
The compressor according to claim 1, wherein at least one of the plurality of welding positions is an outer peripheral surface of the back yoke portion and corresponds to a radially outer side of the tooth portion.   2. The compressor according to claim 1, wherein at least one of the plurality of welding positions is arranged on a line connecting a circumferential center of the teeth portion and a center of the core.   The compressor according to claim 1, wherein a gap is provided in the back yoke portion.   The compression according to any one of claims 1 to 3, wherein a heat transfer shielding portion is provided in at least one of the portions corresponding to the plurality of welding positions of the back yoke portion. Machine.   The compressor according to claim 4, wherein the heat transfer shielding part is provided between the welding position and the slot adjacent to the welding position.   The compressor according to claim 4 or 5, wherein the heat transfer shielding portion is provided only in a portion corresponding to the welding position in the vertical direction.   5. The planar view, wherein the heat transfer shielding portion extends in a direction intersecting the radial direction, and an end portion in a direction intersecting the radial direction has a tapered shape or a circular shape. The compressor of any one of -6. The casing is provided with a weld hole in a portion corresponding to the welding position,
The planar width of the direction crossing the radial direction of the heat transfer shielding portion in plan view is larger than the width of the welding hole in the direction crossing the radial direction. The compressor according to item 1.   The compressor according to any one of claims 4 to 8, wherein a plurality of the heat transfer shielding portions are provided at intervals along the radial direction.   The heat transfer shielding portion is a space provided at a position spaced apart from the outer end portion of the back yoke portion, and is a portion through which the magnetic flux of the back yoke portion flows and outside the center in the radial direction of the back yoke portion. The compressor according to any one of claims 4 to 9, wherein the compressor is disposed at a portion of the compressor.   The compressor according to any one of claims 4 to 9, wherein the heat transfer shielding portion is a recess formed in a portion of the back yoke portion facing the slot.   The compressor according to claim 11, wherein a plurality of the recesses are provided for one slot. The compressor according to any one of claims 1 to 12 , wherein resin is provided between the casing and the back yoke portion. The compressor according to any one of claims 1 to 13 , wherein the insulating member is a film. The compressor according to any one of claims 1 to 14 , wherein the insulating member is permeable to oil and / or refrigerant. The compressor according to any one of claims 1 to 15 , wherein the insulating member has bubbles therein. The compressor according to any one of claims 1 to 16 , wherein a winding system of the coil is concentrated winding. CO characterized by using the _second refrigerant compressor according to any one of claims 1 to 17.

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