WO2022107212A1

WO2022107212A1 - Hermetic electric compressor

Info

Publication number: WO2022107212A1
Application number: PCT/JP2020/042825
Authority: WO
Inventors: 啓介加藤
Original assignee: 三菱電機株式会社
Priority date: 2020-11-17
Filing date: 2020-11-17
Publication date: 2022-05-27

Abstract

The purpose of the present invention is to provide a hermetic electric compressor in which the coaxial alignment precision of a stator and a pressure vessel is improved when the stator is fixed to the pressure vessel, while suppressing strain on an iron core. This hermetic electric compressor comprises: a compression mechanism unit that compresses a refrigerant; a motor unit that drives the compression mechanism unit and comprises a stator and a rotor; a pressure vessel that accommodates the compression mechanism unit and the motor unit; and a fixing ring disposed below the stator. The pressure vessel (40) comprises a vessel trunk (42) which is a tubular body in which the stator (35) of the motor unit (30) is disposed. The vessel trunk comprises: an accommodating section (42b), the inner diameter dimension of which is larger than other portions; and a fixing step section (42a) formed at an end of the accommodating section. The inner diameter dimension D2 of the accommodating section is larger than the outer diameter dimension Ds of the stator. The fixing ring (36) is fixed to the inner periphery of the accommodating section of the vessel trunk. The stator is disposed between the fixing step section and the fixing ring.

Description

Sealed electric compressor

The present disclosure relates to a closed electric compressor, and particularly to a structure for fixing a stator of an electric motor portion.

A conventional closed-type electric compressor includes a motor unit including a stator and a rotor rotatably arranged on the inner peripheral side of the stator, and a compression mechanism unit driven by the motor unit. It consists of a pressure vessel to house.

In such a closed electric compressor, the stator is fixed to the pressure vessel by shrink fitting. The iron core of the stator is distorted due to shrinkage stress. Distortion of the iron core increases the iron loss during compressor operation and reduces the operating efficiency of the compressor. Therefore, a compressor for fixing the stator to the pressure vessel by welding has been proposed (see, for example, Patent Document 1). In this compressor, the strain of the iron core is suppressed by fixing the stator to the pressure vessel by spot welding.

Japanese Unexamined Patent Publication No. 2011-27048

In the closed electric compressor according to Patent Document 1, the strain of the iron core can be suppressed, but since the stator is fixed to the pressure vessel by spot welding, the welded portion of the stator is pulled toward the pressure vessel. .. Since the position of the central axis of the stator deviates from the central axis of the pressure vessel due to the order of welding, there is a problem that the accuracy of the coaxiality between the stator and the pressure vessel deteriorates.

The sealed electric compressor according to the present disclosure is made to solve the above-mentioned problems, and is a stator and a pressure vessel for fixing the stator to the pressure vessel while suppressing the strain of the iron core. The purpose is to improve the coaxiality accuracy with.

The sealed electric compressor according to the present disclosure includes a compression mechanism unit that compresses a refrigerant, an electric motor unit that has a stator and a rotor to drive the compression mechanism unit, and a pressure that accommodates the compression mechanism unit and the motor unit. The pressure container comprises a container and a fixing ring arranged below the stator, the pressure container includes a body container which is a cylinder in which the stator of the motor portion is arranged, and the body container is inside. A housing portion having an inner diameter larger than that of the other portions and a fixed step portion formed at the end of the housing portion are provided, and the inner diameter dimension D2 of the housing portion is the outer diameter of the stator. Greater than the dimension Ds, the fixing ring is fixed to the inner surface of the housing portion of the body container, and the stator is arranged between the fixing step portion and the fixing ring.

According to the closed electric compressor according to the present disclosure, the accuracy of the coaxiality between the iron core of the stator and the pressure vessel can be improved without causing strain of the iron core, so that the stator and the rotor are coaxial. The degree can be secured and the efficiency of the sealed electric compressor is improved.

It is a vertical sectional view explaining the schematic structure of the closed type electric compressor 100 which concerns on Embodiment 1. FIG. FIG. 3 is a top view of the stator 35 according to the first embodiment as viewed from above. It is a perspective view which showed the iron core 50 which concerns on Embodiment 1. FIG. It is a figure seen from the inside of the stator unit 31 constituting the stator 35 which concerns on Embodiment 1. FIG. It is explanatory drawing of the state which fixed the stator 35 which concerns on Embodiment 1 to the body container 42. It is a bottom view which saw the stator 35 fixed to the body container 42 which concerns on Embodiment 1 from the lower side in the z direction. FIG. 3 is a top view of the fixing ring 36 according to the first embodiment as viewed from above. It is explanatory drawing which showed the method of fixing the stator 35 which concerns on Embodiment 1 to the body container 42. It is explanatory drawing which shows the state which the fixing ring 36 which concerns on Embodiment 1 is seen from the outer peripheral side of a stator 35. It is a vertical sectional view of the stator 35 which concerns on Embodiment 1. FIG. It is a horizontal sectional view (BB sectional view in FIG. 9) of the stator 35 which concerns on Embodiment 1. FIG. It is explanatory drawing which shows the state which the fixing ring 36 which concerns on Embodiment 2 is seen from the outer peripheral side of a stator 35. It is a vertical sectional view of the stator 35 which concerns on Embodiment 2. FIG. It is a horizontal sectional view of the stator 35 which concerns on Embodiment 2. FIG. It is explanatory drawing which shows the state which the fixing ring 36 which concerns on Embodiment 3 is seen from the outer peripheral side of a stator 35. It is a vertical sectional view of the stator 35 which concerns on Embodiment 3. FIG. It is a horizontal sectional view of the stator 35 which concerns on Embodiment 3. FIG.

Hereinafter, embodiments of the sealed electric compressor according to the present disclosure will be described with reference to the drawings. The present disclosure is not limited to the following embodiments, and can be variously modified without departing from the gist of the present disclosure. In addition, the present disclosure includes all combinations of configurations that can be combined among the configurations shown in the following embodiments and modifications thereof. Further, in each figure, those having the same reference numerals are the same or equivalent thereof, which are common to the whole text of the specification. In each drawing, the relative dimensional relationship or shape of each constituent member may differ from the actual one.

Embodiment 1.
FIG. 1 is a vertical sectional view illustrating a schematic structure of a closed electric compressor 100 according to a first embodiment. The sealed electric compressor 100 according to the first embodiment is one of the components of a refrigerating cycle device used in, for example, an air conditioner, a refrigerator, a refrigerator, a vending machine, a water heater, and the like. The closed electric compressor 100 is a fluid machine that sucks in the refrigerant circulating in the refrigeration cycle, compresses the sucked refrigerant, and discharges the sucked refrigerant. In the following drawings including FIG. 1, the dimensional relationship and shape of each constituent member may differ from the actual ones. In the first embodiment, the closed electric compressor 100 will be described by taking a scroll compressor as an example.

[About the closed electric compressor 100]
As shown in FIG. 1, the closed electric compressor 100 includes a compression mechanism unit 10 including a compression chamber 11 for compressing a refrigerant, an electric motor unit 30 for driving the compression mechanism unit 10, a compression mechanism unit 10 and an electric motor unit 30. A pressure vessel 40 for accommodating the above. The compression mechanism unit 10 is formed with a discharge port 3 for discharging the refrigerant compressed in the compression chamber 11. The pressure vessel 40 is composed of, for example, a cylindrical body container 42, an upper container 41 press-fitted into the upper opening of the body container 42, and a lower container 43 press-fitted into the lower opening of the body container 42. Has been done. The pressure vessel 40 is connected to a suction pipe 44 for sucking an external refrigerant into the pressure vessel 40 and a discharge pipe 45 for discharging the compressed refrigerant to the outside of the pressure vessel 40.

The closed electric compressor 100 is provided in the pressure vessel 40 and includes a chamber 4 arranged on the fixed scroll 21. The chamber 4 is formed with a concave portion 4A in which the refrigerant discharged from the discharge port 3 of the compression mechanism portion 10 is stored. The concave portion 4A is formed so as to be recessed from the lower side to the upper side in the Z direction. A discharge port 4B extending in the Z direction is formed in the central portion of the concave portion 4A. Here, the discharge port 3 and the concave portion 4A communicate with each other, and the concave portion 4A and the discharge port 4B communicate with each other. Therefore, the refrigerant compressed in the compression chamber 11 is discharged into the space inside the discharge muffler 7A, which will be described later, via the discharge port 3, the concave portion 4A, and the discharge port 4B.

Further, the sealed electric compressor 100 is provided in the pressure vessel 40 and includes a discharge valve 5 and a valve retainer 6 arranged on the chamber 4. A portion of the discharge valve 5 and the valve retainer 6 on one end side is fixed on the chamber 4 by a fixing member 8 composed of, for example, a bolt. Hereinafter, the discharge valve 5, the valve retainer 6, and the fixing member 8 are collectively referred to as a discharge valve mechanism 90. That is, the discharge valve mechanism 90 includes a discharge valve 5, a valve retainer 6, and a fixing member 8.

The sealed electric compressor 100 includes a discharge muffler 7A and a discharge muffler 7B arranged in the pressure vessel 40 and arranged on the chamber 4. The discharge muffler 7B is provided so as to cover the upper side of the discharge muffler 7A. The discharge muffler 7A forms a space in which the refrigerant is discharged between the lower surface thereof and the upper surface of the chamber 4. The space formed between the discharge muffler 7A and the chamber 4 communicates with the concave portion 4A and the discharge port 3 via the discharge port 4B. For example, a plurality of holes (not shown) are formed in the discharge muffler 7A, and the refrigerant flows out from the discharge muffler 7A side to the discharge muffler 7B side through the plurality of holes (not shown). The discharge muffler 7B forms a space between the lower surface thereof and the upper surface of the discharge muffler 7A to allow the refrigerant to flow out from the discharge muffler 7A side. Further, a hole (not shown) is also formed in the discharge muffler 7B, and the refrigerant flows out into the space inside the pressure vessel 40 through the hole (not shown). The refrigerant flowing out of the discharge muffler 7B is discharged from the closed electric compressor 100 via the discharge pipe 45.

The compression mechanism unit 10 has a function of compressing the gas refrigerant sucked from the suction pipe 44 in the compression chamber 11 and discharging it into the space in the discharge muffler 7A through the discharge port 3 by being driven by the motor unit 30. Have. The compression mechanism unit 10 has a fixed scroll 21 and a swing scroll 22.

The fixed scroll 21 is fixed to the first frame 46 fixedly supported in the pressure vessel 40 by bolts or the like. The fixed scroll 21 has a base plate portion 23 and spiral teeth 25 which are involute curved protrusions erected on one surface of the base plate portion 23 (lower surface in the first embodiment). There is. Further, in the central portion of the fixed scroll 21, a discharge port 3 for discharging a gas refrigerant compressed in the compression chamber 11 and having a high pressure is formed. On the outlet side of the discharge port 3 (upper surface side of the base plate portion 23), a discharge valve mechanism 90 is provided that opens and closes the discharge port 3 according to the discharge pressure of the refrigerant and prevents the backflow of the refrigerant.

The swing scroll 22 is rotatably supported by the first frame 46. The swing scroll 22 is configured to perform a revolution turning motion (swing motion) without rotating with respect to the fixed scroll 21 by means of an Oldham joint (not shown). The swing scroll 22 has a base plate portion 24 and spiral teeth 26 which are involute curved protrusions erected on one surface (upper surface in the first embodiment) of the base plate portion 24. ing. Further, a hollow cylindrical swing scroll boss portion 27 is formed at a substantially central portion of a thrust surface (lower surface in the first embodiment) which is the other surface of the base plate portion 24. An eccentric shaft portion 33a provided at the upper end of the rotating shaft 33, which will be described later, is fitted into the swing scroll boss portion 27.

The fixed scroll 21 and the swing scroll 22 are fitted in the spiral tooth 25 and the spiral tooth 26 so as to mesh with each other, and are mounted in the pressure vessel 40. A compression chamber 11 is formed between the spiral tooth 25 and the spiral tooth 26. The volume of the compression chamber 11 changes due to the swinging motion of the swing scroll 22 causing the relative positional relationship between the spiral teeth 25 and the spiral teeth 26 to change.

The swing scroll 22 is supported by the first frame 46. The first frame 46 slidably supports the swing scroll 22 on a thrust plate (not shown) provided in the first frame 46. The upper end face of the first frame 46 is in contact with the fixed scroll 21 and the opening formed in the upper end face is closed. The lower part of the first frame 46 is provided with a bearing that rotatably supports the rotating shaft 33 connecting the swing scroll 22 and the rotor 32 of the motor unit 30. The bearing portion is made of, for example, an iron-based magnetic material.

The motor unit 30 has a stator 35 fixed to the pressure vessel 40, and a rotor 32 rotatably attached to the stator 35 and rotationally driven by energizing the stator 35. ing. A rotating shaft 33 is attached to the center of the rotor 32. The upper end of the rotating shaft 33 is formed with an eccentric shaft portion 33a that rotatably fits with the swing scroll boss portion 27. The electric motor unit 30 rotationally drives the rocking scroll 22 via the rotating shaft 33, so that the gas refrigerant is compressed by the compression mechanism unit 10.

In the pressure vessel 40, a second frame 47 is fixed below the motor unit 30. The second frame 47 supports the ball bearing 48 in the pressure vessel 40. The outer ring of the ball bearing 48 is press-fitted and fixed to the central portion of the second frame 47. The ball bearing 48 rotatably supports the lower end of the rotating shaft 33.

In the closed electric compressor 100 having the above configuration, when the stator 35 of the motor unit 30 is energized, the rotor 32 and the rotating shaft 33 attached to the rotor 32 rotate around the central axis J. As the rotation shaft 33 rotates, the swing scroll 22 swings with respect to the fixed scroll 21. As a result, the volume of the compression chamber 11 formed between the spiral teeth 25 of the fixed scroll 21 and the spiral teeth 26 of the swing scroll 22 continuously fluctuates.

At this time, when the volume of the compression chamber 11 increases, the pressure in the compression chamber 11 becomes lower than the pressure in the suction space R of the pressure vessel 40, and the refrigerant in the suction space R is sucked into the compression chamber 11. After that, when the volume of the compression chamber 11 is reduced by the rocking motion of the rocking scroll 22, the refrigerant sucked into the compression chamber 11 is compressed, and the pressure in the compression chamber 11 rises. When the pressure in the compression chamber 11 becomes higher than the preset pressure, the compressed refrigerant pushes up the discharge valve 5 of the discharge valve mechanism 90 and is discharged into the space in the discharge muffler 7A.

[Rough configuration of stator 35 and iron core 50]
FIG. 2 is a top view of the stator 35 according to the first embodiment as viewed from above. FIG. 3 is a perspective view showing the iron core 50 according to the first embodiment. The following description will be given in a state where the central axis J of the stator 35 is in the Z direction (vertical direction). As shown in FIG. 2, the stator 35 is configured by connecting a plurality of stator units 31 in an annular shape. Each of the plurality of stator units 31 is composed of a core iron core 50 and windings 55 centrally wound around the iron core 50.

The iron core 50 is configured by laminating a plurality of iron plates. As shown in FIGS. 2 and 3, the iron core 50 has a substantially T-shaped shape when viewed from the z direction. The iron core 50 includes an arc-shaped core back portion 51 that constitutes the outer peripheral portion of the stator 35, and a teeth portion 52 that protrudes from the inner peripheral surface 51b of the core back portion 51 in the inner peripheral direction of the stator 35. Further, a groove 51a is formed on the back surface of the core back portion 51, which is the outer peripheral surface of the stator 35. The grooves 51a are provided so as to penetrate both end faces of the iron core 50 in the z direction. The groove 51a is also referred to as a core back groove.

As shown in FIG. 3, the teeth portion 52 includes a teeth base 52a around which the winding 55 is wound and a pair of teeth tips 52b projecting from the teeth base 52a on the inner peripheral side of the iron core 50 in the circumferential direction. To prepare for. In the cross section perpendicular to the z direction, the tooth base portion 52a has a width dimension smaller than that of the core back portion 51 and the tooth tip portion 52b, that is, the dimension in the circumferential direction of the stator 35 is smaller. The iron core 50 has a concave slot portion 53 formed by a core back portion 51 and a side surface of the teeth portion 52. The slot portion 53 has a concave surface in which the inner peripheral surface 51b of the core back portion 51, the surface 52c of the tooth tip portion 52b on the core back portion 51 side, and the side surface of the tooth portion 52 are connected to each other.

The stator 35 is configured by connecting a plurality of iron cores 50 in the circumferential direction. The plurality of iron cores 50 abut the end faces 50a of the core back portions 51 and are connected in the circumferential direction, and the core back portions 51 are connected to each other in an annular shape to form a stator 35. The stator unit 31 constituting the stator 35 is configured by assembling the upper insulating member 60, the lower insulating member 70 and the insulating film 80 to the iron core 50, and is arranged in a cylindrical shape. As shown in FIG. 2, the end faces 50a of the core back portion 51 are connected to each other in an annular shape, so that two slot portions 53 through which the winding 55 passes are communicated with each other between the adjacent teeth portions 52. .. The stator 35 is housed in the pressure vessel 40 with the central axis J of the cylindrical shape directed in the z direction (vertical direction) in a state where the iron core 50 is connected in a cylindrical shape as shown in FIG.

[Structure of stator 35]
FIG. 4 is a view seen from the inside of the stator unit 31 constituting the stator 35 according to the first embodiment. As shown in FIG. 4, each of the plurality of stator units 31 constituting the stator 35 includes an iron core 50, an upper insulating member 60, a lower insulating member 70, and two insulating films 80. An upper insulating member 60 is attached to the upper portion of the iron core 50 in the z direction. Further, a lower insulating member 70 is attached to the lower portion of the iron core 50 in the z direction. The upper insulating member 60 and the lower insulating member 70 each abut and are fixed to the iron core 50.

In the insulating film 80, the upper side of the insulating film 80 is sandwiched between the iron core 50 and the upper insulating member 60, and the lower side is sandwiched between the iron core 50 and the lower insulating member 70. It is fixed to the side surface of the tooth portion 52 of 50. Then, the end portion 80a of the insulating film 80 is held in a shape extending horizontally from the teeth portion 52 as shown in FIG. Therefore, the tooth portion 52 of the iron core 50 is in a state where the upper surface and the lower surface are covered with the upper insulating member 60 and the lower insulating member 70, and both side surfaces are covered with the insulating film 80, and is completely insulated from the winding 55. Will be done.

[How to fix the stator 35]
FIG. 5 is an explanatory diagram of a state in which the stator 35 according to the first embodiment is fixed to the body container 42. FIG. 6 is a bottom view of the stator 35 fixed to the body container 42 according to the first embodiment as viewed from below in the z direction. FIG. 5 shows a state in which only the body container 42 is cut in a cross section including the central axis, and the stator 35 and the fixing ring 36 show a state seen from the side surface. As shown in FIG. 5, the stator 35 is housed in a cylinder-shaped body container 42 of the pressure vessel 40. The stator 35 has the upper end surface 50c in contact with the fixed step portion 42a. A fixing ring 36 is arranged below the stator 35. The fixing step portion 42a and the fixing ring 36 are fixed in the body container 42 by sandwiching the stator 35 from above and below.

In the body container 42, the inner diameter of the inner surface 42c in the range from the upper end of the body container 42 to the upper end of the stator 35 is D1, and the inner diameter of the inner surface 42c in the range from the lower end of the body container 42 to the upper end of the stator 35 is D2. It is formed so as to be. That is, the inner surface 42c of the body container 42, which is a portion other than the accommodating portion 42b, has an inner diameter dimension of D1 and is formed to have an inner diameter smaller than that of the accommodating portion 42b. The range in which the inner diameter of the body container 42 is D2 is referred to as a housing portion 42b in which the stator 35 and the fixing ring 36 are housed. The body container 42 is formed so that D1 is smaller than D2 and a fixed step portion 42a is provided. The accommodating portion 42b formed in the lower part of the body container 42 having a diameter in the range of D2 is formed by expanding the inner diameter of the body container 42 or by cutting the inner surface 42c of the body container 42. Will be done.

The sealed electric compressor 100 includes an oil drain pipe 49 provided so as to extend downward from a surface facing the lower surface of the swing scroll 22 of the first frame 46. The oil drain pipe 49 is inserted into the groove 51a, or its lower end is arranged above the groove 51a in the z direction. The oil drain pipe 49 drains the oil supplied to the first frame 46 into the lower container 43, and promotes the oil to circulate in the closed electric compressor 100.

FIG. 7 is a top view of the fixing ring 36 according to the first embodiment as viewed from above. The fixing ring 36 is provided with protrusions 36a and through holes 36b at the same intervals as the plurality of stator units 31 constituting the stator 35. The protrusion 36a is arranged only on one surface of the fixing ring 36.

The fixing ring 36 is arranged below the stator 35, and the inner peripheral surface 36c of the fixing ring 36 is configured so as not to come into contact with the lower insulating member 70. The fixing ring 36 is assembled below the stator 35 so that the protrusion 36a projects toward the stator 35. As shown in FIG. 5, the fixing ring 36 is configured such that the protrusion 36a is inserted into the groove 51a when the fixing ring 36 is arranged so as to be in contact with the lower end surface of the stator 35. As a result, even if the sealed electric compressor 100 operates and the stator 35 receives a rotational force, the movement of the stator 35 is restricted by the protrusion 36a.

Further, the fixing ring 36 is provided with a through hole 36b. The through hole 36b of the fixing ring 36 is arranged below the lower end of the oil drain pipe 49 so that the oil flowing from the oil drain pipe 49 along the groove 51a flows smoothly into the lower container 43. That is, the through hole 36b is arranged so as to correspond to the groove 51a into which the oil drain pipe 49 is inserted or the groove 51a in which the oil drain pipe 49 is arranged above.

During operation of the closed electric compressor 100, the stator 35 receives a force of rotation around the central axis J by the magnetic force of the rotor 32. The fixing ring 36 prevents the stator 35 from rotating around the central axis J by inserting the protrusion 36a into the groove 51a.

As shown in FIG. 5, the outer diameter dimension Dr of the fixing ring 36 is configured to be larger than the inner diameter dimension D2 of the body container 42. The fixing ring 36 is fixed to the inner surface of the accommodating portion 42b of the body container 42 by shrink fitting or press fitting. Assuming that the outer diameter of the stator 35 is Ds, the magnitude relationship between the dimensions of each part is D1 <Ds <D2 <Dr.

FIG. 8 is an explanatory diagram showing a method of fixing the stator 35 according to the first embodiment to the body container 42. When assembling the stator 35 to the body container 42, the body container 42 is in a state where the lower side in FIG. 5 faces upward. The inverted stator 35 is inserted into the inverted body container 42, and the upper end surface 50c of the stator 35 is inserted until it comes into contact with the fixed step portion 42a of the body container 42. After that, the fixing ring 36 is inserted into the body container 42 from the lower insulating member 70 side of the stator 35. The fixing ring 36 is fixed to the body container 42 by shrink fitting or press fitting, so that the stator 35 is fixed between the fixing step portion 42a of the body container 42 and the fixing ring 36.

Since the outer diameter dimension Dr of the fixing ring 36 according to the first embodiment is formed to be larger than the inner diameter dimension D2 of the accommodating portion 42b formed in the lower part of the body container 42, the fixing ring 36 is formed as it is in the body portion. Cannot be placed in the container 42. However, the fixing ring 36 can be inserted into the body container 42 by heating the vicinity where the fixing ring 36 of the housing portion 42b of the body container 42 is inserted and expanding the housing portion 42b in the radial direction. After that, when the body container 42 cools and contracts in the radial direction, the inner diameter dimension D2 of the accommodating portion 42b of the body container 42 returns to the original state, and the fixing ring 36 is fixed in a so-called shrink-fitting state.

FIG. 9 is an explanatory diagram showing a state in which the fixing ring 36 according to the first embodiment is viewed from the outer peripheral side of the stator 35. FIG. 10 is a vertical sectional view of the stator 35 according to the first embodiment. FIG. 10 shows a cross section of a portion AA in FIG. FIG. 11 is a horizontal sectional view (BB sectional view in FIG. 9) of the stator 35 according to the first embodiment. As shown in FIGS. 9, 10 and 11, the side surface of the protrusion 36a is formed so as to be parallel to the groove 51a, and the end surface 36d of the fixing ring 36 abuts on the lower end surface 50d of the iron core 50. It is configured as follows.

As described above, the sealed electric compressor 100 according to the first embodiment is configured to sandwich and fix the stator 35 between the fixing ring 36 and the fixing step portion 42a from both sides in the z direction. Generally, when an electromagnetic steel sheet is used for the iron core 50 of the stator of a motor, when the stator is fixed by press fitting or shrink fitting, the iron loss may increase due to the compressive stress generated. However, according to the fixing structure of the stator 35 of the sealed electric compressor 100 according to the first embodiment, the stator 35 is sandwiched in the z direction, that is, in the central axis J direction of the stator 35 as described above. Since it is fixed, the stress generated in the stator 35 is suppressed. By suppressing the stress generated in the stator 35, iron loss is suppressed, the operating efficiency of the closed electric compressor 100 is improved, and the performance of the closed electric compressor 100 can be improved.

Further, in the closed electric compressor 100 according to the first embodiment, since the stator 35 is fixed to the protrusion 36a of the fixing ring 36 fixed to the inner surface of the body container 42, the stator 35 and the body container are fixed. The accuracy of the coaxiality with 42 is improved. As a result, the accuracy of the coaxiality between the stator 35 and the rotor 32 and the rotating shaft 33 is also improved, so that the operating efficiency of the sealed electric compressor 100 is improved.

Embodiment 2.
The closed electric compressor 100 according to the second embodiment is a modification of the fixed ring 36 of the closed electric compressor 100 according to the first embodiment. In the second embodiment, the differences from the closed electric compressor 100 according to the first embodiment will be mainly described.

FIG. 12 is an explanatory diagram showing a state in which the fixing ring 36 according to the second embodiment is viewed from the outer peripheral side of the stator 35. FIG. 13 is a vertical sectional view of the stator 35 according to the second embodiment. FIG. 13 shows a cross section of a portion AA in FIG. FIG. 14 is a horizontal sectional view of the stator 35 according to the second embodiment. FIG. 14 shows a cross-sectional view taken along the line BB in FIG. The basic configuration of the sealed electric compressor 100 according to the second embodiment is the same as the configuration shown in the first embodiment, and the same functions and configurations are shown using the same reference numerals. , The description will be omitted.

As shown in FIGS. 12, 13 and 14, in the fixing ring 36 according to the second embodiment, the side surface 36e in the circumferential direction of the protrusion 36a is inclined with respect to the side surface 51e of the groove 51a. That is, the side surface 36e of the protrusion 36a of the fixing ring 36 is formed so as to be tapered when viewed from the outside of the fixing ring 36. When the fixing ring 36 is press-fitted or shrink-fitted, the tapered protrusion 36a enters the groove 51a to fix the stator 35.

The protrusion 36a of the fixing ring 36 is formed so as to widen from the tip toward the root. The tip portion 36g of the protrusion 36a is formed to be smaller than the width of the groove 51a of the stator 35, and the root portion 36f is formed to be wider than the groove 51a. Therefore, a gap is formed between the end surface 36d of the fixing ring 36 and the lower end surface 50d of the iron core 50. As a result, the oil from the oil drain pipe 49 and the oil flowing downward from other places travel downward through the groove 51a, from above the end surface 36d of the fixing ring 36, to the inside of the fixing ring 36, and through the through hole 36b. Flow to. As a result, the circulation of oil in the closed electric compressor 100 is further promoted as compared with the first embodiment.

In the fixing ring 36 according to the second embodiment, since the protrusion 36a fits into the groove 51a and the position of the stator 35 is determined, the stress applied when fixing the stator 35 can be suppressed. Further, since the side surface 36e of the protrusion 36a and the side surface 51e of the groove 51a are in contact with each other as shown in FIG. 12, the stator 35 is suppressed from rotating around the central axis J, and the sealed electric compressor 100 is used. It can be operated stably.

Embodiment 3.
The closed electric compressor 100 according to the third embodiment is a modification of the fixed ring 36 of the closed electric compressor 100 according to the first embodiment. In the third embodiment, the differences from the closed electric compressor 100 according to the first embodiment will be mainly described.

FIG. 15 is an explanatory diagram showing a state in which the fixing ring 36 according to the third embodiment is viewed from the outer peripheral side of the stator 35. FIG. 16 is a vertical sectional view of the stator 35 according to the third embodiment. FIG. 16 shows a cross section of a portion AA in FIG. FIG. 17 is a horizontal sectional view of the stator 35 according to the third embodiment. FIG. 17 shows a cross-sectional view taken along the line BB in FIG. The basic configuration of the sealed electric compressor 100 according to the third embodiment is the same as the configuration shown in the first embodiment, and the same functions and configurations are shown using the same reference numerals. , The description will be omitted.

As shown in FIGS. 15, 16 and 17, the fixing ring 36 according to the third embodiment is configured such that the inner side surface 36h, which is the radial side surface of the protrusion 36a, is inclined with respect to the bottom surface 51h of the groove 51a. Will be done. That is, the inner side surface 36h of the protrusion 36a is formed in a taper so that the inner diameter dimension decreases from the tip to the root.

The protrusion 36a of the fixing ring 36 is formed so that the width of the fixing ring 36 in the radial direction increases from the tip to the root. The tip portion 36g of the protrusion 36a is formed so that the distance from the central axis J is larger than that of the bottom surface 51h of the groove 51a of the stator 35, and the root portion 36f is formed from the central axis J rather than the bottom surface 51h of the groove 51a. It is formed so that the distance between the two is small.

In the fixing ring 36 according to the third embodiment, at the time of press fitting or shrink fitting, the tapered protrusion 36a enters the groove 51a, the inner side surface 36h abuts on the bottom surface 51h of the groove 51a, and the stator 35 is fixed. .. As shown in FIG. 7, the fixing ring 36 is provided with protrusions 36a at a plurality of positions on the circumference. Then, the inner side surface 36h of the plurality of protrusions 36a abuts on the bottom surface 51h of the groove 51a, respectively. Since the position of the stator 35 is determined by the plurality of protrusions 36a, the coaxiality accuracy with the fixing ring 36 is good. Since the fixing ring 36 is fixed to the body container 42 by press fitting or shrink fitting, as a result, the stator 35 is improved in the accuracy of the coaxiality with the body container 42. The stator 35 has a rotor 32 and a rotation supported by the first frame 46 and the second frame 47, which are also fixed to the body container 42 by improving the accuracy of the coaxiality with the body container 42. The coaxial accuracy with the shaft 33 is improved.

As described above, the sealed electric compressor 100 according to the third embodiment can suppress the stress generated by fixing to the stator 35 as in the first and second embodiments. At the same time, the coaxial accuracy between the stator 35, the rotor 32, and the rotating shaft 33 is improved, so that the operating efficiency of the sealed electric compressor 100 is improved.

Note that the present disclosure is not limited to the configuration of the above-described embodiment. Further, in the sealed electric compressor 100, the features of the fixing ring 36 disclosed in each embodiment can be appropriately combined and adopted. In short, I would like to add that the gist of this disclosure also includes the scope of various changes, applications, and uses made by those skilled in the art as necessary.

3 Discharge port, 4 chamber, 4A concave part, 4B discharge port, 5 discharge valve, 6 valve retainer, 7A discharge muffler, 7B discharge muffler, 8 fixing member, 10 compression mechanism part, 11 compression chamber, 21 fixed scroll, 22 shaking Dynamic scroll, 23 base plate part, 24 base plate part, 25 spiral teeth, 26 spiral teeth, 27 swing scroll boss part, 30 motor parts, 31 stator unit, 32 rotors, 33 rotation shafts, 33a eccentric shaft parts, 35 stator, 36 fixing ring, 36a protrusion, 36b through hole, 36c inner peripheral surface, 36d end face, 36e side surface, 36f root part, 36g tip part, 36h inner side surface, 40 pressure container, 41 upper container, 42 body part Container, 42a fixed stage, 42b accommodating part, 42c inner surface, 43 lower container, 44 suction pipe, 45 discharge pipe, 46 first frame, 47 second frame, 48 ball bearing, 49 oil drain pipe, 50 iron core, 50a end face, 50c upper end face, 50d lower end face, 51 core back part, 51a groove, 51b inner peripheral surface, 51e side surface, 51h bottom surface, 52 teeth part, 52a teeth base, 52b teeth tip part, 52c surface, 53 slot part , 55 winding, 60 upper insulating member, 70 lower insulating member, 80 insulating film, 80a end, 90 discharge valve mechanism, 100 sealed electric compressor, D2 inner diameter dimension, Dr outer diameter dimension, J center shaft, R suction space.

Claims

The compression mechanism that compresses the refrigerant and
An electric motor unit having a stator and a rotor to drive the compression mechanism unit,
A pressure vessel accommodating the compression mechanism portion and the motor portion,
With a fixing ring placed below the stator,
The pressure vessel is
Includes a body container, which is a cylinder in which the stator of the motor unit is arranged.
The body container is
A housing part with an inner diameter larger than the other parts inside,
A fixed step portion formed at the end of the accommodating portion is provided.
The inner diameter dimension D2 of the accommodating portion is
Larger than the outer diameter dimension Ds of the stator,
The fixing ring
Fixed to the inner surface of the housing of the body container,
The stator is
A closed electric compressor arranged between the fixed step portion and the fixed ring.
The fixing ring
It is provided with a protrusion provided on the end face facing the direction in which the stator is arranged.
The stator is
A groove is formed on the outer peripheral surface and penetrates from the end surface facing the fixed step portion to the end surface facing the fixing ring.
The protrusion is
The sealed electric compressor according to claim 1, which is inserted into the groove.
The protrusion is
The sealed electric compressor according to claim 2, wherein the peripheral side surface of the fixing ring is inclined so as to be tapered toward the tip end.
The protrusion is
The closed electric compressor according to claim 2 or 3, wherein the inner side surface, which is an inward facing surface of the fixing ring, is inclined so as to be tapered toward the tip end.
The protrusion is
The closed electric compressor according to claim 3 or 4, which abuts on the groove of the stator.
The fixing ring
The sealed electric compressor according to claim 5, which is arranged with a gap between the end face of the fixing ring and the stator.
The fixing ring
The closed electric compressor according to any one of claims 1 to 6, wherein a through hole is formed in an end surface facing the stator.
The outer diameter dimension Dr of the fixing ring is
Larger than the inner diameter dimension D2 of the accommodating portion,
The fixing ring
The sealed electric compressor according to any one of claims 1 to 7, which is fixed to the accommodating portion by shrink fitting or press fitting.