JP2001304123A - Hermetic compressor, method of manufacturing the same, and refrigerating air conditioning device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve a problem that an electric element core is deformed, and the efficiency is lowered caused by the increase of iron loss, when the electric element manufactured by annularly bending a stator core obtained by laminating an iron core piece and joining the same, is shrinkage-fitted to a restriction shell. SOLUTION: The electric element manufactured by annularly bending the stator core obtained by laminating the iron core piece, is fixed to a rolled shell manufactured by rolling and joining a plate-shaped metal having the rigidity lower than that of the restriction shell, by the shrinkage-fitting or the press- fitting. The deformation of the electric element is prevented by fitting a joint part of the stator core to a joint part of the rolled shell, whereby the lowering of the efficiency can be inhibited.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor formed by fixing a stator core formed by bending a connecting portion to an inner wall of a closed container formed by winding a plate-shaped metal into a roll. And a method of manufacturing the same, and a refrigeration / air-conditioning apparatus equipped with the compressor.

[0002]

2. Description of the Related Art The structure of a conventional refrigerant compressor is disclosed, for example, in Japanese Patent Laid-Open Publication No. 3-194185. Japanese Unexamined Patent Publication No. 3-194185 discloses a multi-cylinder rotary compressor having a structure as shown in FIG.
FIG. 6 is a view showing the structure of a conventional hermetic compressor, in which 1 is a closed container, 2 is an electric element, 3 is a compression element,
4 is a suction muffler and 30 is a discharge pipe.

[0003] The stator core of the conventional electric element 2 is formed by laminating and fixing stator core pieces punched in a substantially annular shape by a press or the like to form a stator core. 1 is shrink-fitted to the inner wall. The rotating force generated when the electric element 2 is energized is transmitted to the compression element 3, and the refrigerant sucked through the suction muffler 4 is compressed by the compression element 3 and discharged from the discharge pipe 30.

[0004] The electric element 2 is shrink-fitted and fixed to the inner wall of the closed container 1, but the accuracy of the closed container 1 differs depending on the type of the closed container. For accurate punched cores,
Although any shrink fit can be easily performed on any closed container, the accuracy and rigidity of the closed container are affected in the case of a stator core formed by bending from a connecting portion. In the case of the drawn shell type in which the metal plate is formed by drawing and the end part becomes a spherical shell, or in the case of the wound shell type in which the metal plate is wound in a roll shape and the abutting part is welded and joined to form the body However, the distortion of the stator core of the electric element 2 when shrink-fitting was different due to the difference in the distortion and rigidity of the closed container, and the degree of reduction in the efficiency of the electric element 2 was also different.

[0005]

Conventionally, a bent type stator core is formed in a substantially annular shape by bending a stator core piece on which a stator core of an electric element 2 is laminated and connecting the pieces by welding or the like. In this case, the shape of the outer wall is distorted in the direction of the connecting portion due to deformation due to welding, and when the electric element 2 is shrunk onto the inner wall of the closed shell type closed container 1, the rigidity of the closed container is large. However, the stator core of the electric element 2 is corrected to the shape of the inner wall of the closed container, and the stator core of the electric element 2 is further distorted, iron loss is increased, efficiency is reduced, and noise is increased. .

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and suppresses distortion caused by shrink-fitting a stator core manufactured by bending an electric element into a closed container, thereby reducing noise and improving efficiency. An object is to provide a compressor.

[0007]

Means for Solving the Problems A first invention of the present invention is:
An electric element including a stator core formed in a substantially annular shape by laminating and fixing stator core pieces and bending the sheet metal, and a plate-shaped metal formed by rolling in a roll shape, the outer diameter of which is smaller than the outer diameter of the stator core of the electric element. And a body of a closed container having a small inner diameter, wherein the stator core of the electric element is fixed to the inner wall of the body of the closed container by press fitting or shrink fitting.

[0008] A second invention of the present invention is to provide a sealed container formed by winding a plate-shaped metal in a roll shape and joining the abutting portions, and by laminating and fixing a stator core piece and bending the same. An electric element having a stator core formed by joining the joining portions so as to form an annular shape, and press-fitting or joining the joining portion of the stator core of the electric element to the mating portion of the closed container. It was fixed by shrink fitting.

According to a third aspect of the present invention, the stator core is formed in a substantially annular shape by laminating and fixing the stator core pieces and bending them from the thin portion.

According to a fourth aspect of the present invention, an electric element having a stator core formed in a substantially annular shape by laminating and bending stator core pieces, and a plate-shaped metal wound in a roll shape. The body of the hermetic container formed and having an inner diameter smaller than the outer diameter of the stator core of the electric element, and the stator core of the electric element is fixed to the inner wall of the body of the hermetic container by press-fitting or shrink fitting. In a refrigerant circuit constituting a refrigeration cycle.

According to a fifth aspect of the present invention, there is provided a motor element manufacturing step of forming a stator core in a substantially annular shape by laminating stator core pieces, bending the core pieces from a thin portion, and rotating the stator core pieces. The manufactured stator core is formed by rolling a plate-shaped metal into a roll and fixed to the inner wall of a cylindrical middle shell having an inner diameter smaller than the outer diameter of the stator core of the electric element by press fitting or shrink fitting. And a sealed container manufacturing step of forming an airtight container by connecting an upper shell and a lower shell so as to close both ends of a cylindrical middle shell to which a stator core is fixed. is there.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiment 1 Hereinafter, the first embodiment of the present invention will be described with reference to FIG. FIG. 1 is a diagram showing a cross section of a rotary compressor as an example of a hermetic compressor. In the figure, 1 is a closed container, 2 is an electric element,
3 is a compression element part, 4 is a suction muffler, 30 is a discharge pipe, 1
Reference numeral 1 denotes a middle shell that constitutes the body of the closed container 1,
The joined portions of the metal plates wound into a roll are joined by welding or the like. Reference numeral 12 denotes a lower shell that forms the bottom of the closed container 1, and 13 denotes an upper shell that forms the top of the closed container 1.

Reference numeral 21 denotes a stator of the electric element 2, and reference numeral 22 denotes a rotor of the electric element 2. The sealed container 1 is a middle shell 11,
The middle shell 11 and the lower shell 12 and the middle shell 11 and the upper shell 13 are hermetically joined by welding or the like, respectively. The outer diameter of the stator 21 is slightly larger than the inner diameter of the middle shell 11, and the outer wall of the stator 21 is fixed to the inner wall of the middle shell 11 of the sealed container 1 by shrink fitting or press fitting.

When the electric element 2 of the compressor constructed as described above is energized, the refrigerant is sucked into the compression element section 3 via the suction muffler 4, compressed and discharged from the discharge pipe 30. At this time, the stator 21 of the electric element 2 is fixed to the inner wall of the middle shell 11 by a sufficient interference so as not to be displaced by vibration at the time of starting and stopping the compressor.

FIG. 2 is a cross-sectional view of a main part of a portion where the electric element is fixed in the closed container according to the first embodiment. In the figure, 1 is a closed container, 11 is a middle shell of the closed container 1, 21 is a stator of the electric element 2, 5 is a back yoke portion of the stator 21, 6 is a tooth portion projecting inward from the back yoke portion 5, Reference numeral 7 denotes a thin portion of the back yoke portion 5, reference numeral 8 denotes a joining portion of the stator 21, and reference numeral 9 denotes an abutting portion of the middle shell 11.

The stator 21 is formed by bending a stator core formed by laminating and fixing iron core pieces with a plurality of thin portions 7 so that the teeth portions 6 protrude inward, and joining the joining portions 8 by welding or the like. It was done. FIG. 3 is a diagram showing a method of manufacturing a bent-type stator core. The term “bending” refers to laminating and fixing core pieces having a thin portion, winding the wire in a linear state, then bending from the thin portion, forming a substantially annular shape, and fixing the joint by welding or the like. It is.
In FIG. 3, 18 is an iron core piece, 6 is a tooth part,
7 is a thin portion, 32 is a winding, and 33 is an insulator as an insulating member. An iron core piece 18 made of a magnetic material as shown in FIG. This iron piece 18
Are connected via a thin portion 7. The teeth 6 are formed on the core piece 18.

Next, as shown in FIG.
Are laminated to form a stator core. Then, FIG.
As shown in (c), the insulator 33 as an insulating member is attached to the periphery of the teeth portion 6 while the stator core is held in a straight line (strip shape). Furthermore, the winding 32 is applied around the teeth portion 6 via the insulator 33 while the stator core is held in a straight line.
It is further bent and rotated to form a substantially annular shape. Since the winding is applied around the teeth 6 in a state of being held in a straight line, the interval between the teeth can be secured, and the winding 32 is easily wound and is not easily damaged.

Further, since it is formed into a substantially annular shape by bending from the thin portion 7, the deformation due to bending is small, the distortion of the stator core is reduced, and a decrease in efficiency can be suppressed. Since this bent type stator can be formed into a substantially annular shape by winding it after winding it, the space factor of the winding can be increased, and the winding can be prevented from being damaged when the winding is inserted. Although a highly reliable electric motor can be obtained, its outer diameter is not a perfect circle due to the influence of welding or the like, but has an elliptical shape distorted in the direction of the joint 8.

The middle shell 11 is formed into a hollow cylindrical shape by winding a metal plate into a roll shape and then joining the mating portions 9 by welding or the like. The outer diameter of the middle shell 11 is also true due to the influence of welding or the like. It is not a circle but an elliptical shape distorted in the direction of the mating portion 9. This closed container 1
Is a rolled shell type formed by joining, by welding, or the like, a metal plate in which a middle shell 11 is wound in a roll shape.

In the case of a wound shell type shell, the middle shell 11 has a tubular shape with both ends open,
The stator core of the electric element 2 described above is fixed to the inner wall 1 by press fitting or shrink fitting. After that, the upper shell 12 and the lower shell 13 at both ends of the middle shell 11 are hermetically joined by welding or the like to form the closed container 1. Therefore, the electric element can be fixed to the middle shell before the upper shell and the lower shell are airtightly joined to the middle shell, the tightening force applied to the stator of the electric element at the time of shrink fitting or press fitting is reduced, and the distortion of the stator core is reduced. It is possible to suppress the reduction in efficiency.

Here, a drawn shell type shell in which a middle shell and a lower shell are integrally formed by drawing is described with reference to FIG. FIG. 4 is a diagram illustrating the difference between the configuration of the wound shell type shell and the configuration of the drawn shell type shell. In the figure, (a) is a wound shell type shell, 11 is a middle shell,
12 is a lower shell, 13 is an upper shell, 3
Has been split. The mating portion 9 of the middle shell 11 is hermetically joined by welding or the like over the entire length.

However, in the case of the drawn shell type shell, 52 is a middle shell portion 57 as shown in FIG.
The lower shell 53 is divided into two parts by an upper shell. The middle shell 53 is divided into two parts by an upper shell, and there is no abutting part joined by welding or the like like the middle shell 11 of a wound shell type shell. Therefore, in the case of the drawn shell type, although it differs depending on the degree of drawing and the accuracy of the drawn type, there is no welded joint as compared with the wound shell type, so that deformation due to welding does not occur. Further, in the case of the drawn shell type, since the middle shell portion 57 and the lower shell portion 58 are integrally formed, the lower shell portion 5 is formed.
If the shell has the same plate thickness and material, the shell has higher rigidity than the wound shell type having no shell.

When the stator 21 of the electric element 2 is fixed to the inner wall of the drawn shell type middle shell 52 by press fitting or shrink fitting, the rigidity of the middle shell 52 is high, so that the stator 21 follows the inner wall shape of the middle shell 52. The shape is distorted, resulting in increased iron loss, reduced motor efficiency and increased noise. On the other hand, when the stator 21 of the electric element 2 is fixed to the inner wall of the wound shell type middle shell 11 by press fitting or shrink fitting, the middle shell 11
Since the rigidity of the stator 21 is small, the deformation of the stator 21 is suppressed, the distortion is less likely to occur, the increase in iron loss is suppressed, and a decrease in motor efficiency can be suppressed. In addition, since the deformation of the stator 21 is suppressed, an increase in noise can be suppressed as compared with a case where the deformation is not suppressed.

In this embodiment, the electric element 2 having the stator of the type that is bent at the thin portion 7 has been described. However, the type may not be of the type that bends at the thin portion. The thin portion is separated and the thin portion is separated. Of the type that are connected by concavo-convex engagement and bent at the concavo-convex engagement part to form a substantially annular shape, or of the type where the thin part is separated and this thin part is connected by a pin and bent from this pin connection part to form a substantially annular shape A similar effect can be obtained with an electric element having a stator.

In this embodiment, a rotary compressor has been described. However, the present invention is not limited to this, and a stator such as a scroll compressor or another hermetic compressor may be shrink-fitted or pressed into the inner wall of a shell. The same effect can be obtained as long as it is fixed.

Embodiment 2 FIG. FIG. 5 is a cross-sectional view of a main part of a portion where the electric element is fixed in the closed container according to the second embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals. 4, reference numeral 1 denotes a closed container, 11 denotes a middle shell of the closed container 1, 21 denotes a stator of the electric element 2, 5 denotes a back yoke portion of the stator 21, and 6 denotes a tooth portion projecting inward from the back yoke portion 5. Reference numeral 7 denotes a thin portion of the back yoke portion 5, reference numeral 8 denotes a joining portion of the stator 21, and reference numeral 9 denotes an abutting portion of the middle shell 11. In the present embodiment, the stator 2 of the electric element 2 is mounted on the inner wall of the wound shell type middle shell 11.
When fixing 1 by press-fitting or shrink fitting, the position of the joint 8 of the stator 21 of the electric element 2 is made to substantially match the position of the mating portion 9 which is hermetically joined by welding of the middle shell 11 or the like. I have.

Here, as described in the first embodiment,
The outer diameter of the stator 21 of the electric element 2 is not a perfect circle due to the influence of welding or the like, but has an elliptical shape distorted in the direction of the joint 8. The middle shell 11 is formed into a hollow cylindrical shape by winding the metal plate into a roll shape and then joining the mating portions 9 by welding or the like. The outer diameter of the middle shell 11 is not a perfect circle due to the influence of welding or the like. , An elliptical shape distorted in the direction of the mating portion 9.

Therefore, if the position of the joining portion 8 of the stator 21 of the electric element 2 is substantially matched with the position of the joining portion 9 of the middle shell 11 by shrink fitting or press fitting as in the present embodiment, The warp direction of the middle shell 11 and the warp direction of the stator 21 of the electric element 2 substantially match, and the warp shape of the stator 21 and the warp shape of the middle shell 11 have the same shape. ), The distortion of the stator 21 is further suppressed than in the first embodiment, and a decrease in motor efficiency and an increase in noise can be suppressed.

In this embodiment, the electric element 2 having the stator which is bent at the thin portion 7 has been described. However, the electric component 2 may not be separately bent at the thin portion, and the thin portion is separated. Of the type that are connected by concavo-convex engagement and bent at the concavo-convex engagement part to form a substantially annular shape, or of the type where the thin part is separated and this thin part is connected by a pin and bent from this pin connection part to form a substantially annular shape A similar effect can be obtained with an electric element having a stator.

In this embodiment, a rotary compressor has been described. However, the present invention is not limited to this, and a stator such as a scroll compressor or another hermetic compressor may be shrink-fitted or press-fitted on the inner wall of a shell. The same effect can be obtained as long as it is fixed by the following.

If the compressor described in the first or second embodiment is mounted on an outdoor unit or an indoor unit of a refrigerating / air-conditioning apparatus, a refrigerator, or the like, noise due to deformation or distortion of the stator core is reduced. It is not necessary to separately provide a sound insulating material or the like in a unit or the like, and a low-noise refrigeration / air-conditioning apparatus can be obtained. Furthermore, since the winding is wound in a straight line and then formed into a substantially annular shape after the winding, the winding can be mass-produced in a simple manufacturing method with less damage, so that an inexpensive apparatus can be provided. In addition, since the compressor of the present invention is inexpensive and has low noise, it can be applied to products installed in a room such as a refrigerator.

[0032]

According to the first aspect of the present invention, there is provided an electric element having a stator core formed in a substantially annular shape by laminating and fixing stator core pieces, and bending the plate-shaped metal into a roll. And a body of an airtight container having an inner diameter smaller than the outer diameter of the stator core of the electric element formed by being wound around
Since the stator core of the electric element is fixed to the inner wall of the body of the sealed container by press-fitting or shrink-fitting, the rigidity is lower than using a drawn shell type shell, and fixing of the electric element at shrink-fitting or press-fitting The distortion of the child can be reduced, and the decrease in efficiency can be suppressed.

[0033] The invention according to claim 2 of the present invention is substantially achieved by winding a plate-shaped metal into a roll, joining an abutting portion and forming a hermetically sealed container and a stator core piece by laminating and fixing, and bending. An electric element having a stator core formed by joining the joining portions so as to form an annular shape, and press-fitting or joining the joining portion of the stator core of the electric element to the mating portion of the closed container. Since it is fixed by shrink fit, the distortion direction of the stator of the electric element and the distortion shape of the middle shell are the same shape, and the tightening force applied to the stator of the electric element during shrink fit or press fitting is reduced, fixing The distortion of the daughter core is reduced, and a decrease in efficiency can be suppressed.

In the invention according to claim 3 of the present invention, the stator core is formed in a substantially annular shape by laminating and fixing the stator core pieces and bending from the thin portion, so that the stator core is less deformed by bending. Is reduced, and a decrease in efficiency can be suppressed.

According to a fourth aspect of the present invention, an electric element having a stator core formed in a substantially annular shape by laminating and bending stator core pieces, and a plate-shaped metal are wound in a roll shape. The body of the hermetic container formed and having an inner diameter smaller than the outer diameter of the stator core of the electric element, and the stator core of the electric element is fixed to the inner wall of the body of the hermetic container by press-fitting or shrink fitting. Since the compressor is provided in the refrigerant circuit constituting the refrigeration cycle, there is no need to separately provide a sound insulating material or the like in the unit, and a low-noise refrigeration / air-conditioning apparatus can be obtained.

According to a fifth aspect of the present invention, there is provided an electric element manufacturing step of forming a stator core in a substantially annular shape by laminating stator core pieces, bending the core from a thin portion, and rotating the stator core pieces. The manufactured stator core is formed by rolling a plate-shaped metal into a roll and fixed to the inner wall of a cylindrical middle shell having an inner diameter smaller than the outer diameter of the stator core of the electric element by press fitting or shrink fitting. A motor-driven element fixing step, and a sealed container manufacturing step of forming an airtight container by connecting an upper shell and a lower shell so as to close both ends of the cylindrical middle shell to which the stator core is fixed, The motorized element can be fixed to the middle shell before the upper shell and lower shell are airtightly joined to the middle shell, and the motorized element can be fixed during shrink fit or press fitting. Clamping force applied to the child is reduced,
The distortion of the stator core is reduced, and a decrease in efficiency can be suppressed.

[Brief description of the drawings]

FIG. 1 is a diagram showing a cross section of a hermetic compressor according to Embodiment 1 of the present invention.

FIG. 2 is a cross-sectional view of a main part of a portion where the electric element is fixed in the closed container according to the first embodiment of the present invention.

FIG. 3 is a diagram illustrating a method of manufacturing a bent-type stator core.

FIG. 4 is a diagram for explaining a difference in configuration between a wound shell type shell and a drawn shell type shell.

FIG. 5 is a cross-sectional view of a main part of a portion where an electric element is fixed in a closed container according to Embodiment 2 of the present invention.

FIG. 6 is a diagram showing a cross section of a conventional hermetic compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Closed container, 2 Electric element, 3 Compression element part, 4 Suction muffler, 5 Back yoke part, 6 Teeth part, 7
Thin section, 8 joint section, 9 mating section, 11 middle shell, 12 lower shell, 13 upper shell, 18 iron core piece, 21 stator, 22 rotor, 32
Winding, 33 insulator, 52 middle shell,
53 Upper shell, 57 Middle shell part, 58
Lower shell part.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) H02K 5/04 H02K 5/04 5/24 5/24 A 7/14 7/14 B (72) Inventor Taro Kato 2-3-3 Marunouchi 2-chome, Chiyoda-ku, Tokyo F-term (reference) 3H003 AA05 AB04 AC03 CE02 CE03 CF06 3H029 AA04 AA13 AA21 AB03 BB32 CC07 CC27 5H002 AA03 AA04 AB04 AB06 AC06 5H605 AA04 BB07 CC03 CC09 CC10 DD09 EA02 EA06 FF01 GG04 5H607 AA04 BB01 BB14 CC01 CC05 CC09 DD01 DD08 FF07 JJ06

Claims (5)

[Claims] 1. An electric element having a stator core formed in a substantially annular shape by laminating and fixing stator core pieces, and a stator of the electric element formed by rolling a plate-shaped metal into a roll. And a body part of a closed vessel having an inner diameter smaller than an outer diameter of the core, wherein the stator core of the electric element is fixed to the inner wall of the body part of the closed vessel by press fitting or shrink fitting. Hermetic compressor. 2. A hermetically sealed container formed by winding a plate-shaped metal into a roll and joining the abutting portions, and joining the joining portions so as to form a substantially annular shape by laminating and fixing the stator core pieces and bending. And an electric element having a stator core formed as described above, and fixed by press-fitting or shrink-fitting so that the joint of the stator core of the electric element coincides with the mating portion of the closed container. Claim 1 characterized by the following:
A hermetic compressor according to item 1. 3. The hermetic compressor according to claim 1, wherein the stator core is formed in a substantially annular shape by laminating and fixing stator core pieces and bending from a thin portion. . 4. An electric element having a stator core formed in a substantially annular shape by laminating and bending stator core pieces, and a stator core of the electric element formed by rolling a plate-shaped metal into a roll. A refrigerating cycle includes a compressor having a body portion of an airtight container having an inner diameter smaller than the outer diameter of the airtight container and a stator core of the electric element fixed to the inner wall of the body portion of the airtight container by press-fitting or shrink fitting. A refrigeration / air-conditioning apparatus provided in a refrigerant circuit that constitutes the above. 5. An electric element manufacturing step of forming a stator core in a substantially annular shape by laminating stator core pieces, bending the stator core pieces from a thin portion and rotating the stator core pieces, and forming a stator core manufactured in the electric element manufacturing step. An electric element fixing step in which a plate-shaped metal is formed by rolling in a roll shape and fixed by press-fitting or shrink fitting to the inner wall of a cylindrical middle shell having an inner diameter smaller than the outer diameter of the stator core of the electric element, A sealed container manufacturing step of forming an airtight container by connecting an upper shell and a lower shell so as to close both ends of a tubular middle shell to which the stator core is fixed, wherein Machine manufacturing method.