JPH05256267A - Compressor for refrigerating cycle - Google Patents

Abstract

PURPOSE:To provide a compressor for a refrigerating cycle wherein a drive motor stator core can be prevented from its deformation and coming off and further to facilitate manufacture. CONSTITUTION:A closed vessel 2 of a compressor 1 for a refrigerating cycle is formed of thermosetting resin of refrigerant resistance, and a side wall of the before-mentioned closed vessel 2 is integrally molded by enveloping a stator 7 so as to expose only its magnetic pole part 142a. The side wall of the closed vessel 2 is partly constituted of a stator core 14 of a drive motor 10, and the refrigerant resistant thermosetting resin-made closed vessel 2 of enveloping a winding part of an exciting coil 15 is formed in both end faces of this stator core 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a drive motor and a compressor arranged in series inside a closed container through which a refrigerant flows.
The present invention relates to a refrigeration cycle compressor in which a compressor compresses a refrigerant by rotating a drive motor.

[0002]

2. Description of the Related Art Generally, a drive motor and a compressor are arranged in series inside a metal hermetic container, and a stator core of the drive motor having a diameter slightly larger than the inner diameter of the hermetic container is burned. There is known a compressor for a refrigeration cycle in which the compressor is directly fixed to the inside of a closed container by fitting.

FIG. 4 shows a vertical section of a conventional scroll-type refrigeration cycle compressor. 31 as a whole
The scroll type refrigeration cycle compressor shown in
It has a closed container 32 through which the refrigerant flows. Inside the closed container 32, a scroll type compression device 35 including a fixed blade member 33 and a swirling blade member 34, and a drive motor 36.
And are arranged vertically in series. The fixed wing member 33
And the orbiting blade member 34 are scroll blades 33a and 34, respectively.
a, the scroll blades 33a and 34a engage with each other to form a compression chamber 37 between the blades. The swirl vane member 34 has a driven shaft 34b on its lower surface, and is configured to perform swivel motion without rotating due to the action of the Oldham ring 38. Scroll wings 33a, 34a
Has a shape that reduces the volume of the compression chamber 37 due to the swirling motion of the swirl vane member 34. The drive motor 36 includes a rotor 39, a stator 40, and a drive shaft 41. The stator 40 includes a stator core 42 and an exciting coil 43. The drive shaft 41 is rotatably supported vertically and is eccentrically loosely fitted to the driven shaft 34b at its upper end. With the above structure, when the drive motor 36 is operated, the drive shaft 41 drives the swirl vane member 34 to swivel via the driven shaft 34b. By the swiveling drive of the swirl vane member 34, the refrigerant in the compression chamber 37 is compressed, and the discharge pipe 44
It is discharged to a higher pressure refrigerant circuit outside. Along with this, low-pressure refrigerant is sucked from the suction pipe 45, and the compression chamber 37
Flows toward.

FIG. 5 shows a cross section of a conventional refrigeration cycle compressor 31. The outer peripheral surface of the stator core 42 has, alternately in the circumferential direction, fitting portions 42 a that fit into the closed container 32 and portions that form a gap between the inner peripheral surface of the closed container 32. The stator core 42 is fixed to the inner peripheral surface of the closed container 32 by a so-called shrink fitting method.
That is, the stator core 42 is
It has an outer diameter slightly larger than the inner diameter of the closed container 32 at room temperature. At the time of assembly, the closed container 32 is heated so that its inner diameter is larger than the outer diameter of the stator core 42, and after the stator core 42 is inserted, it is cooled to room temperature. Closed container 3
By the cooling of 2, the closed container 32 and the stator iron core 42 are in close contact with each other and do not fall off.

[0005]

However, in the conventional compressor for refrigeration cycle in which the stator core is directly fixed to the inner peripheral surface of the metal hermetic container by shrink fitting, the rigidity of the stator core and the hermetic container is large. Therefore, an extremely small dimensional error due to the shrink fitting margin results in an extremely large difference in tightening force. Moreover, since the closed container is generally formed by drawing or deep drawing, the dimensional error of its inner diameter is large, so that the stator core is deformed by too large a tightening force, or conversely, a too small tightening force. There was a problem of falling out. From the viewpoint of manufacturing, the conventional refrigeration cycle compressor requires high dimensional accuracy control in order to obtain an appropriate tightening force.
This makes it difficult to manufacture the entire refrigeration cycle compressor. When fixing the stator core of the drive motor to the inside of the sealed container by shrink fitting, the stator is affected by heat and the insulation of the magnet wire that constitutes the exciting coil of the stator or the conductor that connects to the external power supply is insulated. The dressing was sometimes damaged. Further, in the conventional refrigeration cycle compressor, there is a problem that a part of the conductor wire connecting the exciting coil of the stator and the external power source directly contacts the refrigerant to deteriorate the insulating material on the surface. Further, since the above-mentioned lead wire is wired through the compressor or the like in the compressor, it is difficult to carry out the wiring work and seal the penetration portion. Therefore, an object of the present invention is to solve the above problems of the conventional refrigeration cycle compressor, and to provide a refrigeration cycle compressor which can prevent the stator core of the drive motor from being deformed or fallen off and which can be easily manufactured. ..

[0006]

In order to achieve the above object, a refrigeration cycle compressor of the present invention is a refrigeration system in which a drive motor and a compression device are arranged in series inside a closed container through which a refrigerant flows. In a cycle compressor,
At least the inner surface of the hermetic container is made of a thermosetting resin having a refrigerant resistance, and the side wall of the hermetic container integrally includes the entire stator so that only the magnetic poles of the stator of the drive motor are exposed. It is characterized by being molded.

Further, the refrigeration cycle compressor of the present invention is a refrigeration cycle compressor having a hermetically sealed container in which a refrigerant flows, a drive motor arranged in series in the flow path of the refrigerant, and a compressor. The stator core of the drive motor constitutes a part of the side wall of the hermetically sealed container, is in close contact with both end faces of the stator core, and is heat resistant to refrigerant containing the winding portion of the exciting coil of the stator. It is characterized in that a closed container made of a curable resin is formed.

[0008]

In any of the above refrigeration cycle compressors, the stator of the drive motor is placed inside the mold for molding the closed container, and the liquid thermosetting resin is injected into this mold and then heated to a predetermined temperature. By curing the resin, the stator of the drive motor can be easily fixed at a predetermined position in the closed container. The stator fixed in this way does not receive a compressive force from the closed container and is not deformed. Since the stator is not deformed, the distance between the magnetic poles of the stator and the rotor can be reduced, and a compressor for a refrigeration cycle equipped with a highly efficient drive motor can be obtained. Further, since the stator is incorporated in a part of the wall of the closed container, the stator does not fall off. Also,
A compressor for a refrigeration cycle having a hermetically-sealed container integrally formed by encapsulating the entire stator, the wall of the hermetically-sealed container surrounding the outer circumference of the stator core is formed of a laminate of a magnetic shield layer and a resin layer. As a result, the magnetic flux that has conventionally leaked to the outside through the side wall of the closed container can be blocked. Since the magnetic flux of the stator trapped in the closed container contributes to the rotational drive of the drive motor, it is possible to obtain a refrigeration cycle compressor having a drive motor with higher efficiency. In addition, the stator core is a part of the side wall, the both ends of the stator core, a refrigerant-resistant thermosetting resin closed container containing the winding portion of the exciting coil is formed scroll type of the present invention According to the compressor for the refrigeration cycle, since the outer peripheral surface of the stator core is in direct contact with the outside air and the heat of the stator core is efficiently dissipated, the cooling efficiency of the motor is high and the refrigeration equipped with a high-output drive motor is used. A cycle compressor can be obtained. Also, at the time of molding the closed container, by wiring the conducting wire of the exciting coil of the stator at a predetermined position,
The conductive wire is contained inside the wall of the closed container, and the insulating material does not come into contact with the refrigerant and deteriorate. Further, when the stator is incorporated in the closed container, it is possible to avoid the difficulty of the work of wiring the conductor in a narrow space.

[0009]

Embodiments of the present invention will be described below with reference to the accompanying drawings. FIG. 1 shows a vertical cross section of a scroll-type compressor for a refrigeration cycle in which a stator is incorporated inside a side wall of a closed container made of a refrigerant-resistant thermosetting resin. A scroll-type refrigeration cycle compressor, generally designated by reference numeral 1, is a closed container 2 in which a refrigerant flows.
have. The hermetic container 2 is made of a refrigerant-resistant thermosetting resin, and the upper end surface is hermetically sealed by a removable lid 3 for incorporating internal parts. A scroll-type compression device 6 including a fixed blade member 4 and a swirl blade member 5 is disposed above the inside of the closed container 2. Below the scroll compressor 6, a drive motor 10 including a stator 7, a rotor 8 and a drive shaft 9 is arranged. The fixed blade member 4 has a scroll blade 4a on its lower surface. The swirl vane member 5 has a scroll vane 5a on the upper surface.
have. These scroll blades 4a and 5a engage with each other to form a compression chamber 11 between the blades. In the scroll blades 4a and 5a, the swirling blade member 5 is a fixed blade member 4
The shape of the compression chamber 11 is such that the volume of the compression chamber 11 gradually decreases when the swirling movement is performed. Swirl wing member 5
Is slidably supported on the upper surface of the frame 12, and when sliding, it is configured to perform a pivoting motion without rotating due to the action of the Oldham ring 13.
A driven shaft 5b is provided on the lower surface of the swirl vane member 4 so as to project therefrom. The stator 7 of the drive motor 10 is a stator core 14
And a coil 15 for excitation, and the entire body except for the magnetic pole portion 14a on the inner circumference is incorporated inside the side wall of the closed container and is integrally molded with the closed container 2. The rotor 8 is arranged inside the stator 7 and is configured to rotate integrally with the drive shaft 9. The drive shaft 9 is rotatably supported at the upper and lower ends by a bearing portion 12 a of the frame 12 and a bearing 16. The upper end of the drive shaft 9 is
It has an engaging portion 9a having an eccentric hole 17. The engaging portion 9a of the drive shaft 9 has its eccentric hole 17 loosely fitted to the driven shaft 5b of the swirl vane member 5 and is inserted inside the bearing portion 12a of the frame 12. With such a configuration, the swirl vane member 5 is driven by the drive shaft 9 in accordance with the rotation of the rotor 8 and swung by the action of the Oldham ring 13. Due to the swirling motion of the swirl vane member 5, the refrigerant in the compression chamber 11 is compressed and discharged from the discharge pipe 18 above the closed container 2 to the high-pressure refrigerant circuit outside. Along with this, low-pressure refrigerant is sucked from the suction pipe 19 at the lower end of the closed container 2, rises inside the closed container 2 as shown by the arrow in FIG. 1, and is taken into the inside of the compression chamber 11. When molding the closed container 2,
The stator core 14 is fixed to a predetermined position of the mold of the closed casing 2 with the exciting coil 15 wound around, and the conductor wire 21 for connecting the exciting coil 15 and the connection terminal 20 is attached to the wall of the closed casing 2. After wiring so as to pass through the inside of the body, a liquid refrigerant-resistant thermosetting resin is injected into the mold and heated to a predetermined temperature to cure the resin so that the hermetic container 2 and the stator 7 are integrated. Mold.

FIG. 2 shows a cross section of the scroll refrigeration cycle compressor 1. As shown in FIG. 2, the wall body of the hermetically sealed container 2 surrounding the outer peripheral surface of the stator core 14 of this embodiment is composed of a laminated body of a magnetic shield layer and a resin layer, as shown by a virtual line in the figure. The magnetic shield layer,
It is formed by dispersing fine particles of a high magnetic permeability metal, for example, a high magnetic permeability cobalt-based amorphous alloy in a resin to form a layer.

Next, the operation of this embodiment will be described below based on the above-mentioned configuration. As described above, in the refrigeration cycle compressor 1 of the present embodiment, the stator 7 is disposed inside the mold of the closed container 2, and the liquid refrigerant-resistant thermosetting resin is injected and heated in the mold. As a result, the stator 7 can be easily fixed inside the hermetic container 2, and the refrigeration cycle compressor 1 that is easy to manufacture as a whole can be obtained without requiring strict dimensional control for manufacturing the stator 7. Further, since the stator 7 is cast and molded inside the closed container 2, the stator 7 does not drop off, or conversely, it is clamped by the closed container 2 and is not deformed. This makes it possible to provide the highly efficient drive motor 10 in which the distance between the magnetic poles of the stator 7 and the rotor 8 is reduced.

Further, according to the refrigeration cycle compressor 1 of the present embodiment, the conductor 21 of the exciting coil 15 is cast inside the wall of the resin-made closed container 2, so that the conductor 21 can be formed in a narrow space. There is no need for wiring, and further, the conductor 21 does not come into contact with the refrigerant to deteriorate the insulating material. In addition, since the refrigerant-resistant thermosetting resin cures at a low temperature of around 120 ° C. as compared with the conventional high temperature at the time of fixing by shrink fitting, when the resin is cast, the conductor 2
1 and the insulating coating material of the exciting coil 15 are not damaged. Further, in the above-mentioned resin that constitutes the closed container 2, iron has a damping ratio of about 0.26 with respect to sound and vibration, whereas
It has a damping ratio of about 0.7 to 1.0 and can effectively dampen sound and vibration. Also, due to the small specific gravity,
This contributes to reduction of the weight of the refrigeration cycle compressor 1. Further, since the wall body of the hermetically sealed container 2 surrounding the outer circumference of the stator core 14 is composed of the laminated body of the magnetic shield layer and the resin layer, the magnetic flux leaked to the outside through the side wall of the hermetically sealed container 2 in the related art. Is blocked by the magnetic shield layer, and as a result, the magnetic flux of the stator 7 is confined inside the closed container 2 and contributes to the rotational drive of the drive motor 10. Therefore, the compressor for a refrigeration cycle equipped with the drive motor 10 having high efficiency 1 can be obtained.

FIG. 3 is a longitudinal section of a scroll refrigerating cycle compressor according to the present invention in which a refrigerant-resistant thermosetting resin closed container containing a winding portion of an exciting coil is formed on both end faces of a stator core. Showing the face. In FIG. 3, in which the same parts as those in FIG.
Is a part of the side wall of the closed container 2, and the stator core 1
A refrigerant-resistant thermosetting resin hermetically sealed container 2 that encloses the winding portion 15a of the excitation coil 15 is formed on both end surfaces of the magnetic recording medium 4. That is, the outer peripheral surface of the stator core 14 is in direct contact with the outside air, so that the heat of the stator core 14 is efficiently dissipated to the outside, and the motor cooling efficiency is high. As a result, the refrigeration cycle compressor 22 including the high-output drive motor 10 can be obtained. Stator core 1
4 can be fixed without compression, the conductor 21 of the exciting coil 15 does not come into contact with the refrigerant, and the insulating coating material is not damaged.
Is the same as.

In a conventional refrigeration cycle compressor, when polyester resin is used for parts that come into contact with the refrigerant,
There was a problem that the polyester resin was deteriorated by the refrigerant and fragmented. On the other hand, in the present invention, by using the refrigerant-resistant thermosetting polyester resin, the polyester resin does not deteriorate even when used in the refrigerant for a long time. The compositional examples of the refrigerant-resistant thermosetting polyester resin used in the present invention are shown below. Unsaturated polyester resin 13.07 wt% (isophthalic acid / phthalic anhydride / propylene glycol) Low shrinkage imparting agent 6.53 wt% (polystyrene) Polymerizable monomer 13.07 wt% (styrene monomer) Polymerization initiator 0.32 wt% (Tertiary butyl perbenzoaide) Filler 65.36 wt% (Calcium carbonate) Release agent 1.63 wt% (Zinc stearate) Glass fiber 10% (Volume ratio) Refrigerant-resistant thermosetting resin with the above composition According to this, even if the resin is used for a long period of time, the resin does not fragment.

The refrigeration cycle compressor is
Although the scroll type refrigeration cycle compressor has been described, the present invention is not limited to the scroll type refrigeration cycle compressor, and is obviously applicable to, for example, a rotary type refrigeration cycle compressor. Further, in the above embodiment, the suction pipe 19 is inserted in the lower portion of the closed container 2 made of resin,
It is obvious that a closed container including the suction pipe may be formed and this closed container may be integrally molded with resin.

[0016]

As is apparent from the above description, according to the compressor for a refrigeration cycle of the present invention, the stator of the drive motor is provided inside the side wall of the hermetically sealed container at least the inner surface of which is made of a thermosetting resin having refrigerant resistance. Since it is cast and molded, the stator and the closed container are manufactured under strict dimensional control.
A compressor for a refrigeration cycle that does not need to be assembled and is easy to manufacture as a whole can be obtained. Further, since the stator fixed in the closed container is not compressed by the closed container and does not deform, a highly efficient drive motor having a small distance between the magnetic poles of the stator and the rotor is provided. be able to. Further, since the closed container is made of resin, it is possible to obtain a low-frequency, low-vibration and lightweight refrigeration cycle compressor due to the high damping ratio for the sound and vibration of the resin and the low specific gravity. Further, by wiring the conducting wire of the exciting coil so as to pass through the inside of the wall of the hermetic container during molding of the hermetic container, the conducting wire does not come into direct contact with the refrigerant, and the insulating material thereof does not deteriorate. Moreover, since it is not necessary to wire the conductors in a narrow space, the compressor can be easily assembled. Further, when the exciting coil and the conductive wire are cast into the resin, the curing temperature of the resin is low, and the insulating coating material of the exciting coil and the conductive wire is not damaged. According to the compressor for a refrigeration cycle having a hermetically-sealed container that encloses the entire stator, the hermetically-sealed container wall body surrounding the outer periphery of the stator core is formed of a laminate of a magnetic shield layer and a resin layer, thereby forming a hermetically-sealed container. It is possible to obtain a refrigeration cycle compressor equipped with a drive motor of higher efficiency by shutting off the magnetic flux leaking to the outside. A scroll-type refrigeration cycle of the present invention in which a stator core is formed as a part of a side wall, and a refrigerant-resistant thermosetting resin hermetically-sealed container including a winding portion of an exciting coil is formed on both end surfaces of the stator core. According to the compressor for a vehicle, in addition to the above effects, the outer peripheral surface of the stator core is in direct contact with the outside air to efficiently dissipate heat, so that the cooling efficiency is high and the refrigeration cycle equipped with a high-output drive motor Can obtain a compressor for.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view of a scroll-type refrigeration cycle compressor of the present invention in which a stator is incorporated inside a side wall of a closed container made of a refrigerant-resistant thermosetting resin.

FIG. 2 is a cross-sectional view of a scroll-type refrigeration cycle compressor of the present invention in which a stator is incorporated inside a side wall of a closed container made of a refrigerant-resistant thermosetting resin.

FIG. 3 is a vertical cross-sectional view of a scroll refrigerating cycle compressor of the present invention in which a refrigerant resistant thermosetting resin closed container including a winding portion of an exciting coil is formed on both end surfaces of a stator core.

FIG. 4 is a vertical cross-sectional view of a conventional compressor for a refrigeration cycle in which a stator core is directly fixed inside a sealed container by shrink fitting.

FIG. 5 is a cross-sectional view of a conventional refrigeration cycle compressor in which a stator core is directly fixed inside a closed container by shrink fitting.

[Explanation of symbols]

 1 Refrigeration Cycle Compressor 2 Closed Container 6 Scroll Type Compressor 7 Stator 10 Drive Motor 14 Stator Core 14a Stator Core Magnetic Pole 15 Excitation Coil 15a Excitation Coil Winding 21 Conductor

Claims (5)

[Claims] 1. A refrigeration cycle compressor in which a drive motor and a compressor are arranged in series inside a hermetic container in which a refrigerant flows, and at least the inner surface of the hermetic container is resistant to the side wall of the hermetic container. A compressor for a refrigeration cycle, which is made of a thermosetting resin having a refrigerant property and is integrally molded with the entire stator so as to expose only a magnetic pole portion of the stator of the drive motor. 2. The compressor for a refrigeration cycle according to claim 1, wherein a side wall of the hermetically sealed container surrounding the outer periphery of the stator of the drive motor is made of a laminated body of a magnetic shield layer and a resin layer. 3. A conductor for connecting the exciting coil of the stator and an external power source is wired so as to pass through the inside of the wall of the resin-made hermetic container and is molded integrally with the hermetic container. A compressor for a refrigeration cycle according to claim 1. 4. A refrigerating cycle compressor having a hermetically sealed container in which a refrigerant flows, a drive motor arranged in series in a flow path of the refrigerant, and a compressor, wherein a stator core of the drive motor is Part of the side wall of the closed container,
A compressor for a refrigeration cycle characterized in that a hermetically sealed container made of a refrigerant-resistant thermosetting resin is formed in close contact with both end surfaces of the stator core so as to enclose a winding portion of an exciting coil of the stator. 5. The conducting wire connecting the exciting coil of the stator and an external power source is wired so as to pass through the inside of the resin wall of the hermetic container and is integrally molded with the hermetic container. The compressor for a refrigerating cycle according to claim 4.