WO2015056364A1

WO2015056364A1 - Compressor

Info

Publication number: WO2015056364A1
Application number: PCT/JP2014/001377
Authority: WO
Inventors: 昭三長谷; 大輔船越; 昭徳福田; 武志平塚; 仁高尾; 信一吉塚; 逸雄清水
Original assignee: パナソニックＩｐマネジメント株式会社
Priority date: 2013-10-15
Filing date: 2014-03-11
Publication date: 2015-04-23
Also published as: JPWO2015056364A1; CN105492769B; JP6233726B2; CN105492769A

Abstract

This compressor is provided with an electric motor section (2), a compression mechanism section (3), and a housing (5). The electric motor section (2) comprises: a stator (10) obtained by stacking a plurality of electromagnetic steel sheets (101); and a rotor (11) provided inside the stator (10). The stator (10) is fixed to an inner wall of the housing (5) by a plurality of laser welded parts (20). The plurality of laser welded parts (20) are formed on the housing (5) in a circumferential direction, with a prescribed interval therebetween. Furthermore, the laser welded parts (20) are formed extending a prescribed length. In the stator (10), the stacked electromagnetic steel sheets (101) are fixed by laser welded parts (102) for fixing the electromagnetic steel sheets. Accordingly, provided is a compressor with which the electric motor section (2) therein is made highly efficient, and with which a coating material coating an outer peripheral surface of the housing (5) is protected.

Description

Compressor

The present invention relates to a compressor used for an air conditioner, a refrigerator, a blower, a water heater, and the like.

A compressor is used for the refrigeration system and the air conditioner. The compressor sucks in the working refrigerant evaporated in the evaporator, compresses the working refrigerant to a pressure necessary for condensation, and delivers the high-temperature high-pressure working refrigerant into the working refrigerant circuit. Such a compressor houses a compression mechanism portion for compressing a refrigerant gas and a motor portion for driving the compression mechanism portion in a sealed container. The motor unit includes a stator fixed to the inner wall surface of the hermetic container, and a rotor transmitting rotational power to the drive shaft.

Conventionally, the stator of the motor unit has been closely fixed to the inner wall of the sealed container by shrink fitting. However, in this method, there is a problem that the stator is deformed due to the contraction stress of the closed container and the efficiency of the motor unit is reduced. That is, a compressive stress is applied to the stator, and the electromagnetic steel plates constituting the stator are distorted, and a magnetic field distortion occurs when the rotor rotates, causing a decrease in the efficiency of the motor unit. In addition, since the vibration generated in the stator is transmitted to the closed container, vibration and noise of the compressor become a problem.

In recent years, a direct current IPM motor driven by a direct current has been proposed from the viewpoint of energy saving. In addition, from the viewpoint of high efficiency, thinning of the electromagnetic steel sheet constituting the stator has been proposed. Although this DC motor can be operated at a wide range of rotational speeds from several rpm to 6000 rpm or more, it uses field-weakening control that generates a large amount of current at high speed operation to generate torque. The decrease and the increase in noise and vibration become more significant.

Then, the method of closely fixing a stator to a sealed container by laser welding is proposed (for example, refer patent document 1). In Patent Document 1, laser irradiation is performed all over the axial direction of the stator core.

Japanese Patent Application Laid-Open No. 63-189685

However, when laser irradiation is performed over the entire axial direction of the stator core as in Patent Document 1, it is necessary to weld all of the stator core and the closed container, and the laser irradiation time and heat amount adjustment Is difficult. In addition, it is necessary to secure a wide contact surface between the motor and the sealed container so that the motor is not damaged by the laser irradiation. Furthermore, since the thickness of the closed container can not be reduced, there is a problem that the stator core design is limited.

In the present invention, the stator is fixed to the inner wall of the housing by the plurality of laser welds, and the plurality of laser welds are formed at predetermined intervals in the circumferential direction of the housing, and the respective laser welds Is formed over a predetermined length, and the stator is one in which laminated electromagnetic steel plates are fixed by a laser welding portion for fixing electromagnetic steel plates.

In order to solve the above-mentioned conventional problems, a compressor of the present invention includes a motor unit, a compression mechanism unit, and a housing, and the motor unit is a stator formed by laminating a plurality of electromagnetic steel plates, It is a compressor which consists of a rotor arranged inside the above-mentioned stator, and the above-mentioned stator is being fixed to the inner wall of the above-mentioned housing by a plurality of laser welds, and a plurality of the above-mentioned laser welds The laser welding parts are formed at predetermined intervals in the circumferential direction of the housing, and each of the laser welded parts is formed over a predetermined length, and the stator is formed of the laminated electromagnetic steel sheets for fixing electromagnetic steel sheets. It is fixed by a laser weld.
As a result, it is possible to realize the high efficiency of the motor unit and the protection of the covering material (heat insulating material, soundproofing material, heat storage material, etc.) that covers the outer peripheral surface of the compressor. Further, since the electromagnetic steel sheet of the stator is fixed by the laser welding portion for fixing the magnetic steel sheet, the compressor having high rigidity of the stator itself and excellent in efficiency and noise can be realized.

ADVANTAGE OF THE INVENTION According to this invention, the efficiency fall of the motor part by deformation of a stator can be prevented. Further, according to the present invention, no swelling (convex portion) occurs in the laser welded portion, so that the damage of the covering material (heat insulating material, soundproofing material, heat storage material, etc.) covering the outer peripheral surface of the compressor can be prevented. it can. Further, since the electromagnetic steel sheet of the stator is fixed by the laser welding portion for fixing the magnetic steel sheet, the compressor having high rigidity of the stator itself and excellent in efficiency and noise can be realized.

Sectional view of a compressor according to an embodiment of the present invention A plan view of a motor unit according to an embodiment of the present invention The figure explaining the laser welding part concerning the embodiment of the present invention The figure which shows the relationship of the motor part and housing which concern on embodiment of this invention. The figure explaining the laser welding part concerning the modification 1 of the present invention The figure explaining the laser welding part concerning modification 2 of the present invention Diagram for explaining the distance between laser welds according to the embodiment of the present invention and the second modification A perspective view of a stator according to an embodiment of the present invention Explanatory drawing which shows the positional relationship of the laser welding part for electromagnetic steel plate fixing, and a laser welding part Characteristic chart showing the relationship between noise from the distance from the laser weld to the laser weld for fixing the magnetic steel sheet

A first invention comprises a motor unit, a compression mechanism unit, and a housing, and the motor unit is disposed inside the stator and a stator formed by laminating a plurality of electric steel plates. A compressor comprising a rotor, wherein the stator is fixed to the inner wall of the housing by a plurality of laser welds, and a plurality of the laser welds are separated by a predetermined distance in the circumferential direction of the housing The laser welded portions are formed over a predetermined length, and the stator is configured such that the laminated electromagnetic steel plates are fixed by the electromagnetic steel plate fixing laser welded portions.
Thereby, the efficiency reduction of the motor unit due to the deformation of the stator can be prevented. In addition, since the laser weld has a predetermined length, laser irradiation at relatively low temperature and low temperature is possible, and local deformation of the stator can be prevented. Furthermore, since no swelling (convex shape) occurs at the laser welding point, it is possible to prevent damage to the covering material (heat insulating material, soundproofing material, heat storage material, etc.) that covers the outer peripheral surface of the compressor. Further, since the electromagnetic steel sheet of the stator is laser-welded, a compressor having high rigidity of the stator itself and excellent efficiency and noise can be realized.

In the second invention, the laser welding portion is formed to be inclined with respect to the axial direction of the housing.
As a result, the welding range can be expanded in the circumferential direction of the housing, and the torque fluctuation received by the stator during compression and the torque fluctuation generated by the rotation of the motor unit can be evenly distributed and held by the plurality of welds. Can.

According to a third aspect of the present invention, the first laser welding portion, and the second laser welding portion disposed circumferentially adjacent to the first laser welding portion are inclined directions with respect to the axial direction of the housing. The opposite.
As a result, the distance between adjacent laser welds can be partially shortened, and the circumferential rigidity of the housing can be increased.

In a fourth aspect of the present invention, a plurality of gaps serving as a refrigerant passage and a contact portion with the housing are formed on the outer peripheral surface of the stator, and the laser welded portion is formed in the contact portion. The fixing laser welding portion is formed in a range of 1/2 of the distance from the central portion of the laser welding portion to the central portion of the adjacent gap.
Thereby, the noise value of the specific frequency component can be reduced.

According to a fifth aspect of the invention, the laser welding portion for fixing the electromagnetic steel sheet is formed on the contact portion forming the laser welding portion or the side portion of the contact portion.
Thereby, the noise value of the specific frequency component can be further reduced.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. The present invention is not limited by the embodiment.

Embodiment
FIG. 1 is a longitudinal sectional view of a compressor 100 according to an embodiment of the present invention. The compressor 100 includes a sealed container 1, a motor unit 2, a compression mechanism unit 3, and a drive shaft 4. The closed container 1 comprises a cylindrical housing 5 and an upper cover 6 and a lower cover 7 closing the opening of the housing 5. The compression mechanism portion 3 is disposed at the lower portion of the housing 5. The motor unit 2 is disposed on the compression mechanism unit 3 inside the housing 5. The compression mechanism unit 3 and the motor unit 2 are connected by the drive shaft 4. The upper cover 6 is provided with a terminal 8 for supplying electric power to the motor unit 2. An oil reservoir 9 for holding lubricating oil is formed at the bottom of the closed container 1. The motor unit 2 is composed of a stator 10 and a rotor 11. The stator 10 is fixed to the inner wall of the housing 5. The rotor 11 is fixed to the drive shaft 4 and rotates with the drive shaft 4. Both ends of the drive shaft 4 are rotatably supported by the upper bearing member 12 and the lower bearing member 13.

When the motor unit 2 is energized and the drive shaft 4 is rotated, the drive shaft

eccentric portions

14a and 14b are eccentrically rotated in the

cylinders

15a and 15b, and the

rolling pistons

16a and 16b are rotated while contacting the vanes (not shown). Exercise. Then, the suction and compression of the refrigerant gas are repeated in both

cylinders

15a and 15b in a cycle shifted by half a rotation. The compression mechanism portion 3 includes an upper bearing member 12, a lower bearing member 13,

cylinders

15a and 15b, rolling

pistons

16a and 16b, and vanes (not shown).

A discharge pipe 17 is provided in the upper part of the closed container 1. The discharge pipe 17 penetrates the upper portion of the upper cover 6 and is open toward the inner space of the closed container 1. The discharge pipe 17 plays a role as a discharge flow path for guiding the refrigerant gas compressed by the compression mechanism unit 3 to the outside of the closed container 1. During operation of the compressor 100, the internal space of the closed vessel 1 is filled with the compressed refrigerant.

Moreover, in order to prevent the liquid compression of the compressor 100, the accumulator 18 is provided. The accumulator 18 separates the refrigerant gas into gas and liquid before directly drawing the refrigerant gas into the compressor 100. The accumulator 18 includes a cylindrical case 19, a refrigerant gas introduction pipe connected to the upper portion of the case 19, and two refrigerant gas lead pipes connected to the lower portion of the case 19.

As a refrigerant compressed by the compression mechanism section 3, it is preferable to use an HFC refrigerant R32. By using the HFC refrigerant R32, the refrigerant circulation amount is increased by about 10% as compared to the conventional alternative refrigerant, and the noise and the vibration of the motor unit 2 can be suppressed without reducing the efficiency even if the load torque increases.
In the compressor 100 configured as described above, the stator 10 and the housing 5 of the motor unit 2 are welded and fixed by laser irradiation with a fiber laser.

FIG. 2 shows a plan view of the motor unit 2 according to the embodiment of the present invention.
As shown in FIG. 2, for the motor unit 2, a DC IPM motor having distributed winding of a winding method is suitable. The motor unit 2 includes a stator 10 fixed to the inner wall surface of the housing 5 and a rotor 11 for transmitting rotational power to the shaft.
The stator 10 has a stator core 22 and a winding 25.
The stator core 22 is formed by laminating a plurality of electromagnetic steel plates made of a metal material. The plurality of electromagnetic steel plates are fixed in a stacked state by the laser welding portion 102 for fixing the electromagnetic steel plates.
The stator core 22 includes an annular yoke portion 22A, a tooth portion 22B projecting radially inward from the yoke portion 22A, a slot 23 formed between adjacent tooth portions 22B, and an inner side of the tooth portion 22B. And a through hole 22C in which the rotor 11 is disposed. Insulating paper (not shown) is inserted in the slot 23 in order to maintain the insulation with the winding 25.

On the outer peripheral portion of the stator 10, that is, the outer peripheral surface of the yoke portion 22A, a plurality of air gaps 24A serving as a refrigerant passage are provided. The gap 24A makes the width gap a in the circumferential direction of the yoke portion 22A larger than the depth gap in the radial direction of the yoke portion 22A. It is preferable that the width gap a in the gap 24A be wider than the circumferential width b of one slot 23, and the width gap a be twice or more the circumferential width b of the slot 23. As described above, by widening the width gap a in the gap 24A, even if the depth gap is reduced, the refrigerant passage can be secured and the efficiency reduction of the motor unit 2 can be prevented. The air gap 24A is provided so as to penetrate the motor unit 2 in the axial direction, and allows the upper space and the lower space of the motor unit 2 to communicate with each other.

A refrigerant passage hole 24B serving as a refrigerant passage is formed in the yoke portion 22A, which is between the adjacent air gaps 24A and is the outer side in the radial direction of the teeth portion 22B. The diameter c of the refrigerant passage hole 24B is smaller than the minimum width d of the teeth portion 22B. As described above, by making the diameter c of the refrigerant passage hole 24B smaller than the minimum width d of the teeth portion 22B, it is possible to secure the refrigerant passage and to prevent the efficiency reduction of the motor unit 2. The refrigerant passage hole 24B is provided to penetrate the motor unit 2 in the axial direction, and allows the upper space and the lower space of the motor unit 2 to communicate with each other.

The refrigerant compressed by the compression mechanism 3 and discharged from the opening of the muffler cover 21 passes through the air gap 24A of the stator 10, the air gap (not shown) of the rotor 11 and the refrigerant passage hole 24B. It is led to space.
The stator 10 and the housing 5 are fixed by six laser welds 20.
The laser welding portion 20 is formed between the adjacent air gaps 24A and at a position which is on the outer side in the radial direction of the slot 23. The laser welding portion 20 is formed such that the focusing point of the fiber laser is at the position of the stator 10. By using a fiber laser, there is little thermal influence at the time of welding. By setting the focusing point of the fiber laser not to the boundary position between the housing 5 and the stator 10 but to the stator 10, welding can be reliably performed with a small spot size.

In the conventional spot welding, since it is necessary to fill the welding hole with a welding material such as brazing material, a raised portion (convex portion) is generated in the welding portion. On the other hand, in the present embodiment, since laser welding is used, no swell (convex portion) occurs in the welded portion, and a concave portion is formed in the outer wall of the housing 5 by the formation of the laser welded portion 20. . Thereby, the damage of the covering material (a heat insulating material, a soundproof material, a thermal storage material etc.) which coat | covers the outer peripheral surface of the compressor 100 can be prevented.

FIG. 3 is a view (a developed view of the housing 5) for explaining the laser welding portion 20 according to the present embodiment. The laser welds 20 are formed at predetermined intervals in the circumferential direction of the housing 5. In the present embodiment, six laser welds 20 are provided. In addition, the mutual space | interval of the laser welding part 20 does not need to be the same, and may be different space | interval. Hereinafter, the length, arrangement, and inclination of the laser welding portion 20 will be described in detail.
The width of the laser welded portion 20 is preferably twice or more the thickness of the electromagnetic steel sheet. By setting the width of the laser welded portion 20 to be twice or more the thickness of the electromagnetic steel sheet, the penetration depth into the stator 10 can be suppressed, and the efficiency reduction of the motor portion 2 can be prevented. The width of the laser weld 20 is, for example, 0.5 mm to 3 mm.

<Length>
The laser welding portion 20 in the present embodiment is formed over a predetermined length in the axial direction of the housing 5. That is, the laser welding portion 20 is linear. When the laser welding portion 20 is formed at a point like the welding point in the conventional spot welding, the local distortion in the stator 10 is large because it is necessary to irradiate the laser at a high temperature and high temperature locally. Become. In the present embodiment, since the laser welded portion 20 has a predetermined length, laser irradiation at relatively low temperature and low temperature is possible, and local deformation of the stator 10 can be prevented.

The figure which shows the relationship between the motor part 2 and the housing 5 in this Embodiment in FIG. 4 is shown. When the length of the laser welded portion 20 is A (see FIG. 3) and the axial length of the stator core 22 is B (see FIG. 4), A is preferably 10% or more and 90% or less of B.
In addition, the laser welded portion 20 is formed at a position exceeding 5% of the axial length B of the stator core 22 in the axial direction of the stator core 22 from the end face of the stator core 22.
In addition, when the length A of the laser welded portion 20 is less than 10% of the axial length B of the stator core 22, the welding strength is insufficient.
In addition, the length A of the laser weld 20 exceeds 90% of the axial length B of the stator core 22 or from the end face of the stator core 22 in the axial direction of the stator core 22 When the laser welded portion 20 is formed at a position within a length range of 5% of the axial length B, sparks generated when welding the stator 10 and the housing 5 are the upper and lower ends of the stator core 22. There is a risk that it may protrude into the housing 5.

Furthermore, the length A of the laser welded portion 20 is preferably 10% or more and 20% or less of the axial length B of the stator core 22. By setting the content to 20% or less, the welding range can be made smaller, and deformation of the stator 10 generated at the time of laser welding can be more effectively prevented.

As an example, practically, the length of the laser weld 20 is about 10 to 20 mm, and the length of the stator core 22 is about 60 mm. In addition, the length of the laser welding part 20 means welding distance. When the laser weld 20 is inclined, the length of the laser weld 20 is A shown in FIG.

It is not necessary that all of the plurality of laser welds 20 have the same length, and laser welds 20 of different lengths may be included. When all of the plurality of laser welds 20 have the same length, torque in the circumferential direction is dispersed at the same height. Therefore, the rotational torque generated in the stator 10 is not received as a moment force in the axial direction, and the vibration of the stator 10 can be suppressed.

<Arrangement 1>
The laser welds 20 in the present embodiment are formed at the same height in the axial direction of the housing 5. As a result, it becomes possible to evenly disperse and hold the torque fluctuation generated by the compression mechanism section 3 and the torque fluctuation generated by the rotation of the motor section 2 by the plurality of laser welding sections 20. In addition, "the same height" does not necessarily mean exactly the same, and includes a state of being somewhat deviated within the range where the above-mentioned effect is exerted. The fact that the housing 5 is formed at the same height in the axial direction can be rephrased as starting points in the housing 5 of the laser welding are made the same height.

(Modification 1)
The modification 1 of the laser welding part 20 which concerns on this Embodiment is shown in FIG. In the present modification, the plurality of laser welded parts 20A are formed at different heights in the axial direction of the housing 5. With this configuration, the distortion of the magnetic field generated during high-speed rotation of the motor unit 2 and the axial vibration generated by the moment force of the rotating torque are held by the laser welds 20A of different heights. Distortion and vibration can be suppressed.

<Arrangement 2>
A plurality of laser welds 20 are formed, and the laser welds 20 are formed at positions spaced 180 degrees apart in the circumferential direction. Thereby, the distortion of the outer peripheral direction by laser welding can be offset.

<Slope>
The laser welding portion 20 in the present embodiment is formed to be inclined with respect to the axial direction of the housing 5. Thereby, the welding range can be expanded with respect to the circumferential direction of the housing 5, and the torque fluctuation received by the stator 10 at the time of compression and the torque fluctuation generated by the rotation of the motor unit 2 can be equalized with the plurality of laser welds 20. It becomes possible to disperse and hold. In practice, the inclination θ of the laser welding portion 20 is inclined in the range of 10 degrees to 30 degrees with respect to the axial direction of the housing 5. In addition, all six laser welding parts 20 do not need to be inclined and formed.

Preferably, adjacent laser welds 20 are formed to be inclined in the opposite direction with respect to the axial direction of the housing 5. Although the details of the reason will be described later, the distance between the ends of the adjacent laser welds 20 can be shortened, and the circumferential rigidity of the housing 5 can be enhanced. Moreover, since welding can be performed while rotating the housing 5, the time required for welding can be shortened.

(Modification 2)
The modification 2 of the laser welding part 20 which concerns on this Embodiment is shown in FIG. In the present modification, a plurality of laser welded portions 20B are formed in parallel with the axial direction of the housing 5. With this configuration, since the laser welded portion 20B can be made longer in the axial direction of the stator 10, it is possible to suppress the vibration of the stator 10.

Hereinafter, the space | interval in each edge part of the laser welding part 20 which concerns on this Embodiment, and the laser welding part 20B which concerns on the modification 2 is demonstrated. FIG. 7 is a view for explaining the distance between the end portions of each of the laser welds 20 and 20B according to the embodiment of the present invention and the second modification. The distance (W) between the ends of the laser weld 20 in the embodiment is smaller than the distance (W ′) between the ends of the laser weld 20B according to the second modification (W <W ′). Thereby, in the embodiment, the rigidity in the circumferential direction of the housing 5 can be enhanced.

Next, the configuration of the stator 10 will be described.
As shown in FIG. 8, the stator 10 is configured by laminating a plurality of electromagnetic steel plates 101. In the present embodiment, the plurality of electromagnetic steel plates 101 are fixed by the electromagnetic steel plate fixing laser welds 102. As a result, a compressor with high rigidity and excellent efficiency and noise can be realized.

Next, the positional relationship between the electromagnetic steel plate fixing laser welded portion 102 for fixing a plurality of electromagnetic steel plates and the laser welded portion 20 for fixing the stator 10 to the housing 5 will be described.
FIG. 9 is an explanatory view showing a positional relationship between the laser welded portion 102 for fixing the electromagnetic steel plate and the laser welded portion 20, FIG. 9 (a) shows an outer peripheral surface of the housing 5, and FIG. The sectional drawing of the vicinity is shown.
The electromagnetic steel plate fixing laser welded portion 102 is formed on the side of the air gap 24A, that is, on the side of the contact portion between the housing 5 and the stator 10. The radially outer position of the slot 23 is the contact portion between the housing 5 and the stator 10.
The laser welding portion 20 is formed on the side of the contact portion between the housing 5 and the stator 10.
As described above, noise can be reduced by forming the electromagnetic steel plate fixing laser welded portion 102 on the side portion of the contact portion between the housing 5 and the stator 10 forming the laser welded portion 20.

FIG. 10 is a characteristic diagram showing the relationship between the distance from the laser welded portion 20 to the laser welded portion 102 for fixing the electromagnetic steel plate and the noise, and FIG. 10A shows the position where the laser welded portion 102 for electromagnetic steel plate fixed is formed. A, B and C are shown, and FIG. 10B shows noise values of specific frequency components at respective positions A, B and C.
The position A is a contact portion between the housing 5 and the stator 10 and overlaps the laser welding portion 20, the position B is a side portion of the contact portion between the housing 5 and the stator 10, and the position C is an air gap 24A. Central part of
Assuming that the distance from the central portion of the laser welded portion 20 to the central portion of the adjacent void 24A is L, as shown in FIG. 10B, the laser welded portion 102 for fixing the electromagnetic steel plate is the central portion of the laser welded portion 20. It is preferable to form in the range of L / 2 to L / 2.
As described above, the noise value of the specific frequency component can be reduced by forming the electromagnetic steel plate fixing laser welded portion 102 in the range of L / 2 from the central portion of the laser welded portion 20, and further, for fixing the electromagnetic steel plate By forming the laser welding portion 102 at the contact portion or the side portion of the contact portion between the housing 5 forming the laser welding portion 20 and the stator 10, the noise value of the specific frequency component can be reduced.

The present invention is not limited to the configuration of the embodiment, and various changes can be made within the scope of the present invention, and the present invention can be implemented in the following other embodiments.
(1) The embodiment shows an example in which the present invention is applied to a two-piston rotary compressor. However, the present invention can also be practiced with a one-piston rotary compressor. Moreover, it is applicable not only to a rotary compressor but, for example, to a scroll compressor.
(2) Although the example in which six laser welding parts 20 were formed was shown in embodiment, it is not restricted to six. It is only necessary to form a plurality.
(3) The embodiment shows an example in which the distributed winding type motor unit 2 is implemented, but the concentrated winding type motor unit 2 can also implement the present invention.
(4) The embodiment shows an example in which the stator 10 and the housing 5 are fixed by laser welding, but first, the motor portion 2 is inserted into the cylindrical housing 5 by shrink fitting, After the clearance dimension with the rotor 11 is determined, welding and fixing may be performed by laser welding.
Although a fiber laser is most suitable for the laser welding portion 20, a fiber laser, a carbon dioxide gas laser, or a YAG laser can be used for the laser welding portion 102 for fixing the electromagnetic steel plate.

As described above, according to the compressor of the present invention, the efficiency of the compressor can be enhanced by preventing the deformation and distortion of the motor unit. Thereby, it is applicable also to uses, such as a heat pump type hot-water heater other than the compressor for air conditioners.

Reference Signs List 1 sealed container 2 motor unit 3 compression mechanism unit 4 drive shaft 5 housing 6 upper cover 7 lower cover 8 terminal 9 oil reservoir 10 stator 11 rotor 12 upper bearing member 13 lower bearing member 14 drive shaft eccentric part 15 cylinder 16 rolling piston Reference Signs List 17 discharge pipe 18 accumulator 19 case 20 laser welded portion 21 muffler cover 22 stator core

22A yoke portion

22B teeth portion 23 slot 24A air gap 24B refrigerant passage hole 25 winding 100 compressor 101 electromagnetic steel plate 102 laser steel welding portion for fixing electromagnetic steel plate

Claims

A motor unit, a compression mechanism unit, and a housing;
The motor unit is a compressor including a stator formed by laminating a plurality of electromagnetic steel plates, and a rotor disposed inside the stator.
The stator is fixed to the inner wall of the housing by a plurality of laser welds,
Forming a plurality of the laser welds at predetermined intervals in the circumferential direction of the housing;
Forming each of the laser welds over a predetermined length;
A compressor, wherein the laminated electromagnetic steel plates are fixed by a laser welding portion for fixing electromagnetic steel plates in the stator.
The compressor according to claim 1, wherein the laser welding portion is formed to be inclined with respect to the axial direction of the housing.
The first laser welding portion and the second laser welding portion disposed circumferentially adjacent to the first laser welding portion have an opposite inclination direction with respect to the axial direction of the housing. A compressor according to claim 2, characterized in.
On the outer peripheral surface of the stator, a plurality of gaps serving as a refrigerant passage and a contact portion with the housing are formed.
Forming the laser weld at the contact portion;
The laser welded portion for fixing the electromagnetic steel sheet is formed in a range of 1/2 of the distance from the central portion of the laser welded portion to the central portion of the adjacent gap. The compressor according to any one.
The compressor according to claim 4, characterized in that the laser welded portion for fixing the electromagnetic steel sheet is formed on the contact portion forming the laser welded portion or a side portion of the contact portion.