WO2020137385A1

WO2020137385A1 - Support structure, and rotating compressor comprising same

Info

Publication number: WO2020137385A1
Application number: PCT/JP2019/047277
Authority: WO
Inventors: 大佑平塚; 祥司郎中
Original assignee: ダイキン工業株式会社
Priority date: 2018-12-28
Filing date: 2019-12-03
Publication date: 2020-07-02
Also published as: JP6791342B2; JP2020110039A

Abstract

This support structure (11) comprises a support body (20, 50) having a wall part (21, 50a), and a supported body (41, 42, 61-63) that is supported contacting the wall part (21, 50a) of the support body (20, 50). The support structure (11) comprises expansion control parts (70) provided to the support body (20, 50) and/or the supported body (41, 42, 61-63). The expansion control parts (70) suppress the thermal expansion of supported contact parts (61, 62a, 63) in a first direction orthogonal to the facing direction of the supported contact parts (61, 62a, 63) and the wall part (21, 50a), and promote the thermal expansion of the supported contact parts (61, 62a, 63) in the facing direction. As a result, the supported body can be prevented from detaching from the support body due to temperature increase.

Description

Support structure and rotary compressor including the same

The present disclosure relates to a support structure and a rotary compressor including the support structure.

Conventionally, a support structure including a support body and a supported body supported by the support body has been known. For example, Patent Document 1 discloses a compressor including a casing that constitutes a support and a stator of an electric motor that constitutes a supported body. In this compressor, the linear expansion coefficient of the casing and the linear expansion coefficient of the stator are different from each other. Patent Document 1 discloses that a member having a larger linear expansion coefficient than the stator is provided between the stator and the casing in order to prevent the stator from coming off the casing due to a difference in linear expansion coefficient. ing.

JP 2001-289173 A

However, in the compressor of Patent Document 1, although it is difficult to remove the stator from the casing by providing the member, there is still a possibility that the stator may be removed from the member or the casing when the temperature rises.

The purpose of the present disclosure is to prevent the supported body from coming off the support body due to the temperature rise.

The first aspect of the present disclosure is supported by a support (20,50) having a wall (21,50a) and a wall (21,50a) of the support (20,50) in contact with the support. A support structure (11) provided with supported objects (41, 42, 61 to 63) is targeted. In this support structure (11), a portion of the supported body (41, 42, 61 to 63) that contacts the wall portion (21, 50a) of the support body (20, 50) is supported by the supported contact portion (61, 42). 62a, 63) provided on at least one of the support (20, 50) and the supported body (41, 42, 61-63), and the supported contact portion (61, 62a, 63) and the wall. The supported contact portion (61, 62a, 63) in the first direction orthogonal to the facing direction of the portion (21, 50a), and the supported contact portion (61, 62a) in the facing direction. , 63) for promoting thermal expansion.

In the first aspect, when the temperature rises, the expansion control section (70) suppresses thermal expansion of the supported contact portions (61, 62a, 63) in the first direction, and the supported contact portion (61) in the opposing direction. , 62a, 63) thermal expansion is promoted. By promoting the latter thermal expansion, the supported contact portions (61, 62a, 63) and the wall portions (21, 50a) are kept in contact with each other when the temperature rises. In other words, the supported contact portions (61, 62a, 63) and the wall portions (21, 50a) do not separate from each other due to thermal expansion when the temperature rises. Therefore, it is possible to prevent the supported bodies (41, 42, 61 to 63) from coming off the support bodies (20, 50) due to the temperature rise.

A second aspect of the present disclosure is the first aspect, wherein the expansion control section (70) is in contact with the supported contact section (61, 62a, 63) in the first direction and is compressed. It is characterized in that thermal expansion of the supported contact portions (61, 62a, 63) is suppressed by applying a load.

In the second aspect, the Poisson effect promotes thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction orthogonal to the first direction.

A third aspect of the present disclosure is the second aspect, wherein the expansion control section (70) contacts a portion of the supported contact section (61, 62a, 63) in the facing direction. Is characterized by.

In the third aspect, the degree to which the thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction can be controlled can be controlled. Here, the thermal expansion is most promoted when the expansion control section (70) contacts the entire supported contact sections (61, 62a, 63) in the facing direction. On the other hand, the thermal expansion is not promoted at all when the expansion control section (70) does not contact the supported contact sections (61, 62a, 63). Based on these relationships, the degree to which the thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction can be controlled can be controlled.

A fourth aspect of the present disclosure is the expansion control unit according to any one of the first to third aspects, wherein a direction orthogonal to the facing direction and orthogonal to the first direction is a second direction. (70) suppresses thermal expansion of the supported contact portions (61, 62a, 63) in the first direction and the second direction and supports the supported contact portions (61, 62a, 63) in the facing direction. It is characterized by promoting the thermal expansion of.

In the fourth aspect, the expansion controller (70) suppresses thermal expansion of the supported contact parts (61, 62a, 63) in the first direction and the second direction. The thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction can be promoted more strongly than in the case where the thermal expansion of the supported contact portions (61, 62a, 63) is suppressed only in the first direction. ..

According to a fifth aspect of the present disclosure, in any one of the first to fourth aspects, the material forming the supported contact portion (61, 62a, 63) is a fiber reinforced resin or LCP resin. It is characterized by

A sixth aspect of the present disclosure is the method according to any one of the first to fifth aspects, wherein the expansion control section (70) is provided in the support body (20, 50), and in the first direction. It is characterized by having a first stepped portion (71) that suppresses thermal expansion of the supported contact portion (61, 62a, 63) due to contact with the supported contact portion (61, 62a, 63).

In the sixth aspect, due to the contact between the first stepped portion (71) and the supported contact portion (61, 62a, 63), thermal expansion of the supported contact portion (61, 62a, 63) in the first direction is suppressed. Thus, the thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction is promoted.

In a seventh aspect of the present disclosure according to the sixth aspect, the first step portion (71) is provided on the support body (20, 50) and protrudes in the facing direction from a first suppressing member (72). ).

In the seventh aspect, the thermal expansion of the supported contact portion (61, 62a, 63) in the first direction is suppressed by the contact between the first suppressing member (72) and the supported contact portion (61, 62a, 63). Thus, the thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction is promoted.

According to an eighth aspect of the present disclosure, in the sixth aspect, the first step portion (71) is constituted by a first recess (73, 81) formed in the support body (20, 50). It is characterized by being

In the eighth aspect, the heat of the supported contact portion (61, 62a, 63) in the first direction is generated by the contact between the side wall of the first recess (73, 81) and the supported contact portion (61, 62a, 63). Expansion is suppressed, and thermal expansion of the supported contact portions (61, 62a, 63) in the opposing direction is promoted.

A ninth aspect of the present disclosure is the method according to any one of the first to eighth aspects, wherein the support (20,50) and the supported contact portion (61,62a,63) are bonded to each other. It is characterized by being.

In the ninth aspect, firm fixing by adhesion is realized between the support body (20, 50) and the supported contact portion (61, 62a, 63). Therefore, it is possible to prevent the supported body (41, 42, 61 to 63) from coming off the support body (20, 50) due to the temperature increase or the temperature decrease.

A tenth aspect of the present disclosure is the method according to any one of the first to ninth aspects, wherein a linear expansion coefficient of a material forming the supported contact portions (61, 62a, 63) in the facing direction is The linear expansion coefficient of the material forming the wall portions (21, 50a) of the support (20, 50) is smaller than the linear expansion coefficient.

In the tenth aspect, since the supported contact portions (61, 62a, 63) have a small linear expansion coefficient in the facing direction, the supported contact portions (61, 62a, 63) face the wall portions (21, 50a) of the support body (20, 50) at the time of temperature rise. Thermal expansion hardly occurs in the direction. On the other hand, since the expansion control section (70) promotes thermal expansion of the supported contact sections (61, 62a, 63) in the opposing direction, the supported bodies (41, 42, 61... 63) is prevented from coming off the support (20,50). On the other hand, the supported contact portions (61, 62a, 63) are less likely to shrink in the facing direction than the wall portions (21, 50a) of the support body (20, 50) when the temperature decreases. Therefore, the supported bodies (41, 42, 61 to 63) are prevented from coming off the support bodies (20, 50) due to the temperature decrease.

An eleventh aspect of the present disclosure is the method according to any one of the first to ninth aspects, wherein the linear expansion coefficient of the material forming the supported contact portions (61, 62a, 63) in the facing direction is The linear expansion coefficient of the material forming the wall portions (21, 50a) of the support (20, 50) is larger than that of the material.

In the eleventh aspect, since the supported contact portions (61, 62a, 63) have a large linear expansion coefficient in the facing direction, the supported contact portions (61, 62a, 63) face the wall portions (21, 50a) of the support body (20, 50) at the time of temperature rise. Thermal expansion easily occurs in the direction. In addition to this, the expansion control section (70) promotes thermal expansion of the supported contact sections (61, 62a, 63) in the opposing direction, so that the temperature of the supported body (41, 42, 61) is increased due to the temperature rise. It is further prevented that ~63) comes off the support (20,50).

A twelfth aspect of the present disclosure is the method according to any one of the first to ninth aspects, wherein a part of the supported contact portions (61, 62a, 63) has a linear expansion coefficient in the facing direction, The wall portion (21, 50a) of the support (20, 50) is made of a material having a coefficient of linear expansion smaller than that of the material, and the other part of the supported contact portion (61, 62a, 63) is The material is characterized in that the linear expansion coefficient in the facing direction is larger than the linear expansion coefficient of the material forming the wall portion (21, 50a) of the support (20, 50).

In the twelfth aspect, a portion of the supported contact portions (61, 62a, 63) made of the material having a small linear expansion coefficient is the wall portion (21, 50) of the support (20, 50) when the temperature decreases. Heat shrinkage is less likely to occur in the opposite direction than 50a). Therefore, the supported bodies (41, 42, 61 to 63) are prevented from coming off the support bodies (20, 50) due to the temperature decrease. On the other hand, among the supported contact parts (61, 62a, 63), the part composed of the material having the large linear expansion coefficient is higher than the wall part (21, 50a) of the support (20, 50) when the temperature rises. Thermal expansion easily occurs in the opposite direction. Therefore, the supported bodies (41, 42, 61 to 63) are further prevented from coming off the support bodies (20, 50) due to the temperature rise.

A thirteenth aspect of the present disclosure is the method according to any one of the first to twelfth aspects, wherein the supported body (41, 42, 61 to 63) has the supported contact portion (61, 62a, 63). ), the main body portion is opposed to the wall portion (21, 50a) of the support (20, 50) and is made of a material different from the constituent material of the supported contact portion (61, 62a, 63). It is characterized by having (41, 42).

In the thirteenth aspect, the supported contact parts (61, 62a, 63) are arranged between the main body part (41, 42) and the wall part (21, 50a). The expansion control unit (70) allows the supported body (41, 42, 61 to 63) having the main body section (41, 42) and the supported contact section (61, 62a, 63) to be removed from the support body (20, 50). It is prevented from coming off.

A fourteenth aspect of the present disclosure is the thirteenth aspect, wherein the expansion control section (70) is provided in the main body section (41, 42) and the supported contact section (61, 41) in the first direction. 62a, 63) is characterized by having a second step portion (74) for suppressing thermal expansion of the supported contact portion (61, 62a, 63).

In the fourteenth aspect, the thermal expansion of the supported contact portion (61, 62a, 63) in the first direction is suppressed by the contact between the second step portion (74) and the supported contact portion (61, 62a, 63). Thus, the thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction is promoted.

A fifteenth aspect of the present disclosure is the second suppression member (75) according to the fourteenth aspect, wherein the second step portion (74) is provided in the main body portion (41, 42) and projects in the facing direction. ) Is configured by.

In the fifteenth aspect, the thermal expansion of the supported contact portion (61, 62a, 63) in the first direction is suppressed by the contact between the second suppressing member (75) and the supported contact portion (61, 62a, 63). Thus, the thermal expansion of the supported contact portions (61, 62a, 63) in the facing direction is promoted.

A sixteenth aspect of the present disclosure is the fourteenth aspect, wherein the second step portion (74) is formed of a second recess (76, 82) formed in the body portion (41, 42). It is characterized by being

In the fifteenth aspect, the contact between the side wall of the second recess (76, 82) and the supported contact portion (61, 62a, 63) causes heat of the supported contact portion (61, 62a, 63) in the first direction. Expansion is suppressed, and thermal expansion of the supported contact portions (61, 62a, 63) in the opposing direction is promoted.

The seventeenth aspect of the present disclosure is directed to a rotary compressor (10) including the support structure (11) according to any one of the thirteenth to sixteenth aspects. The rotary compressor (10) includes a tubular casing (20) that constitutes the support (20, 50) and a body portion (41, 42) of the supported body (41, 42, 61 to 63). ) And a supported contact portion (61, 62a, 63) of the supported body (41, 42, 61 to 63), and the casing (20). ) And the stator (41), and insulating members (61, 63) for insulating the two from each other.

In the seventeenth aspect, the expansion control section (70) keeps the insulating member (61, 62) in contact with the wall section (21, 50a) of the casing (20). The stator (41) of the electric motor (40) is supported by the casing (20) via the insulating members (61, 62) and cannot be removed from the casing (20).

An eighteenth aspect of the present disclosure is a rotary compressor (10) including the support structure (11) according to any one of the thirteenth to sixteenth aspects, or the rotary compressor (10 of the sixteenth aspect. ) Is targeted. This rotary compressor (10) includes a drive shaft (50) that constitutes the support (20, 50) and a main body portion (41, 42) of the supported body (41, 42, 61 to 63). An electric motor (40) having a rotor (42) and a supported contact portion (61, 62a, 63) of the supported body (41, 42, 61 to 63), and the drive shaft (50). And insulating members (61, 63) located between the rotor and the rotor (42) to insulate them from each other.

In the eighteenth aspect, the expansion control unit (70) keeps the insulating member (61, 63) in contact with the wall portion (50a) of the drive shaft (50). The rotor (42) of the electric motor (40) is supported by the drive shaft (50) via the insulating members (61, 63) and cannot be separated from the drive shaft (50).

A nineteenth aspect of the present disclosure is the method according to any one of the first to eleventh aspects, wherein the entire supported body (41, 42, 61 to 63) is the supported contact portion (61, 62a). , 63) and the same material.

FIG. 1 is a front view schematically showing the rotary compressor of the first embodiment. FIG. 2 is a plan sectional view schematically showing the support structure of Embodiment 1, and shows a section taken along line II-II of FIG. FIG. 3 is a partial cross-sectional view schematically showing the support structure of Embodiment 1, showing a cross section taken along line III-III of FIG. FIG. 4 is a plan sectional view schematically showing a support structure of Modification 1 of Embodiment 1. FIG. 5 is a partial cross-sectional view schematically showing a support structure of Modification 2 of Embodiment 1. FIG. 6 is a partial cross-sectional view schematically showing a support structure of Modification 3 of Embodiment 1. FIG. 7 is a partial cross-sectional view schematically showing the support structure of Modification 4 of Embodiment 1. FIG. 8 is a partial cross-sectional view schematically showing a support structure of Modification 5 of Embodiment 1. FIG. 9 is a partial cross-sectional view schematically showing a support structure of Modification 6 of Embodiment 1. FIG. 10 is a plan sectional view schematically showing the support structure of the second embodiment. FIG. 11 is a partial cross-sectional view schematically showing the support structure of Embodiment 2, and shows a cross section taken along line XI-XI of FIG. FIG. 12 is a partial cross-sectional view schematically showing the support structure of Modification 1 of Embodiment 2. FIG. 13 is a partial cross-sectional view schematically showing a support structure of Modification 2 of Embodiment 2. FIG. 14 is a partial cross-sectional view schematically showing a support structure of Modification 3 of Embodiment 2. FIG. 15 is a partial cross-sectional view schematically showing a support structure of Modification 4 of Embodiment 2. FIG. 16 is a partial cross-sectional view schematically showing a support structure of Modification 5 of Embodiment 2. FIG. 17 is a plan sectional view schematically showing a support structure of a first modified example of the other embodiment.

<<Embodiment 1>>
The first embodiment will be described. The rotary compressor (10) of the present embodiment is configured as a scroll compressor. The rotary compressor (10) may be another type of rotary compressor.

As shown in FIG. 1, the rotary compressor (10) includes a casing (20), a compression mechanism (30), an electric motor (40), and a drive shaft (50).

The casing (20) is a substantially cylindrical closed container that extends vertically. The casing (20) includes a cylindrical wall portion (21), an upper lid (22) that closes the upper end of the wall portion (21), and a lower lid (24) that closes the lower end of the wall portion (21). .. The upper lid (22) is provided with a suction pipe (23) for sucking a fluid into the casing (20). The wall (21) is provided with a discharge pipe (25) for discharging the compressed fluid to the outside of the casing (20). The casing (20) is made of an iron-based material such as cast iron or carbon steel. The extending direction of the casing (20) is not limited to the vertical direction. The casing (20) constitutes a support.

A part of the wall portion (21) of the casing (20) that comes into contact with a resin member (61) described later constitutes a support contact portion (21a). In this example, the wall portion (21) has four supporting contact portions (21a).

The compression mechanism (30) is housed inside the casing (20). The compression mechanism (30) includes a fixed scroll and a movable scroll (not shown). In the compression mechanism (30), the movable scroll makes an eccentric rotary motion with respect to the fixed scroll. Due to this eccentric rotational movement, the fluid is sucked from the suction pipe (23), the sucked fluid is compressed, and the compressed fluid is discharged from the discharge pipe (25).

The electric motor (40) is the drive source of the compression mechanism (30). The electric motor (40) includes a stator (41) shown in FIGS. 2 and 3, and a rotor (not shown). The electric motor (40) rotationally drives the compression mechanism (30) via the drive shaft (50).

As shown in FIG. 2, the stator (41) is supported by being sandwiched by the wall portion (21) of the casing (20) together with the resin member (61) at a plurality of locations (four locations in this example) in the circumferential direction. To be done. In other words, the stator (41) and the resin member (61) are in contact with and supported by the wall portion (21) of the casing (20). The stator (41) has a laminated structure in which a large number of steel plates are laminated in the axial direction. In the axial direction of the casing (20), the length of the stator (41) is substantially equal to the length of the resin member (61). The stator (41) constitutes the main body of the supported body. The resin member (61) constitutes an insulating member and also constitutes a supported contact portion. The stator (41) and the resin member (61) form a supported body. In FIG. 2, the detailed structure of the stator (41) such as a through hole provided in the center of the stator (41) for accommodating the rotor is omitted. The shape of the stator (41) in FIG. 2 is merely an example.

The drive shaft (50) is a rod-shaped member that connects the movable scroll of the compression mechanism (30) and the rotor of the electric motor (40). The drive shaft (50) is made of an iron-based material such as cast iron or carbon steel. The rotary motion of the electric motor (40) is transmitted to the compression mechanism (30) via the drive shaft (50), whereby the movable scroll of the compression mechanism (30) performs the above-described eccentric rotary motion.

As shown in FIGS. 2 and 3, the rotary compressor (10) further includes a support structure (11). The support structure (11) is composed of the casing (20) and the stator (41), the resin member (61), the circumferential direction suppression plate (78), and the axial direction suppression plate (75). The circumferential restraint plate (78) and the axial restraint plate (75) each constitute an expansion controller.

The resin member (61) is a plate member sandwiched between the wall portion (21) of the casing (20) and the stator (41) of the electric motor (40). The resin member (61) is made of an insulating resin and electrically insulates the casing (20) and the stator (41). This insulating resin is, for example, fiber reinforced resin or LCP resin.

The resin member (61) has anisotropy regarding the coefficient of linear expansion. The casing (20) is isotropic with respect to the linear expansion coefficient. Specifically, the linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the wall portion (21) in the axial direction of the casing (20). In the axial direction of the casing (20), the linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the stator (41). The axial direction of the casing (20) is the first direction. In other words, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the wall portion (21) in the first direction. In the first direction, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the main body portion (41) of the supported body.

In the radial direction of the casing (20), the linear expansion coefficient of the material forming the resin member (61) is smaller than the linear expansion coefficient of the material forming the support body (20, 50) between the wall portions (21). The “between the wall parts (21)” is between a part of the wall part (21) and another part of the wall part (21) that faces the part with the supported body interposed therebetween. The "support (20) between the wall portions (21)" is the support body (20) that constitutes the space between the wall portions (21). When the support (20) is made of a single material, the "linear expansion coefficient of the material forming the support (20) between the wall portions (21)" is the linear expansion coefficient of the material. .. When the support body (20) is composed of a plurality of materials, the "linear expansion coefficient of the material forming the support body (20) between the wall portions (21)" is the linear expansion coefficient of each material and the support body. It is a coefficient determined by the shape of (20). This coefficient can be obtained by calculating the rate of change of the distance between the wall portions (21) per unit temperature in a test or analysis. In other words, the "coefficient of linear expansion of the material forming the support (20) between the wall portions (21)" is the rate of change in the distance between the wall portions (21) per unit temperature. The linear expansion coefficient of the material forming the resin member (61) is smaller than the linear expansion coefficient of the material forming the stator (41) in the radial direction of the casing (20). The radial direction of the casing (20) is the direction in which the resin member (61) and the wall portion (21) face each other. In other words, in the direction in which the supported contact portion (61) and the wall portion (21) of the support (20) face each other, the linear expansion coefficient of the material forming the supported contact portion (61) is the wall portion (21). It is smaller than the linear expansion coefficient of the material forming the support body (20).

The linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the wall portion (21) in the circumferential direction of the casing (20). In the circumferential direction of the casing (20), the linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the stator (41). The circumferential direction of the casing (20) is the second direction. In other words, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the wall portion (21) in the second direction. In the second direction, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the main body portion (41) of the supported body.

The anisotropy of the linear expansion coefficient of the material forming the resin member (61) is determined by the orientation direction of the fibrous substance contained in the material forming the resin member (61) or the material forming the resin member (61). Occurs according to the orientation direction of the molecular chain of.

In the plan view shown in FIG. 2, the center points of the outer surfaces of the resin member (61) adjacent in the circumferential direction of the casing (20) (in other words, the contact surface of the resin member (61) with the wall portion (21)) are aligned with each other. The direction in which they are connected linearly is the adjacent direction (one of which is shown by the broken line in FIG. 2). The adjacent direction is the center point of the inner surface of the supporting contact portion (21a) adjacent in the circumferential direction of the casing (20) (in other words, the contact surface of the supporting contact portion (21a) with the resin member (61)) in plan view. It is also the direction that connects the two in a straight line.

At this time, when the circumferential direction suppression plate (78) and the axial direction suppression plate (75) do not exist, the two adjacent resin members (61) or the supporting contact portions (21a) in the circumferential direction are adjacent to each other. In the direction, the rate of change of the distance between the outer surfaces of the adjacent resin members (61) per unit temperature is smaller than the rate of change of the distance between the inner surfaces of the adjacent support contact portions (21a) per unit temperature. Further, in the case where the circumferential direction restraint plate (78) and the axial direction restraint plate (75) are not present, with respect to any two resin members (61) or support contact portions (21a) facing in the radial direction, the facing direction In, the rate of change of the distance between the outer surfaces of the resin member (61) per unit temperature is smaller than the rate of change of the distance between the inner surfaces of the supporting contact portion (21a) per unit temperature.

In other words, when the circumferential restraint plate (78) and the axial restraint plate (75) are not present, the support contact portion increases as the ambient temperature of the resin member (61) and the support contact portion (21a) increases. The casing (20), the stator (41), and the resin member (61) thermally expand so that the (21a) moves away from the resin member (61). This is because the linear expansion coefficient of the support body (20) between the wall portions (21) is larger than the linear expansion coefficient of the supported body in the radial direction of the casing (20). "Linear expansion coefficient of supported body" means that the linear expansion coefficients of the stator (41) and the resin member (61) included in the supported body are α1 and α2, respectively, and the supported body is supported in the radial direction of the casing (20). When the ratio of the length occupied by each of the stator (41) and the resin member (61) in the body is P1, P2 (P1+P2=1), it is a numerical value represented by the formula α1×P1+α2×P2. .. This equation is extensible when any component is composed of multiple materials and is extensible in any direction.

The circumferential restraint plate (78) is a plate-shaped member that restrains thermal expansion of the resin member (61) in the circumferential direction of the casing (20). The circumferential direction suppression plate (78) extends in a direction orthogonal to the radial direction of the casing (20) in the plan view shown in FIG. In this orthogonal direction, one end of the circumferential restraint plate (78) is fixed to the wall portion (21) by, for example, welding, and the other end of the circumferential restraint plate (78) contacts the side surface of the resin member (61). ing. If the other end of the circumferential direction restraint plate (78) contacts the side surface of the resin member (61) in a high temperature state, it does not contact the side surface of the resin member (61) in a normal temperature state and a low temperature state. Good. The circumferential restraint plate (78) constitutes a third restraint member.

The axial restraint plate (75) is a plate-shaped member that restrains thermal expansion of the resin member (61) in the axial direction of the casing (20). As shown in FIG. 3, the axial restraint plate (75) is fixed to the upper and lower ends of the stator (41) and protrudes radially outward of the casing (20) with respect to the outer peripheral surface of the stator (41). There is. A second step (74) is formed between the protruding portion and the outer peripheral surface of the stator (41). The projecting portion is in contact with the end of the resin member (61) in the axial direction of the casing (20). The axial restraint plate (75) is in contact with a part of the end of the resin member (61) in the radial direction of the casing (20) (particularly, a part on the inner side in the radial direction). In addition, the said protrusion part does not need to be in contact with the edge part of the resin member (61) in a normal temperature state and a low temperature state, if it contacts the edge part of the resin member (61) in a high temperature state. The axial restraint plate (75) constitutes a second restraint member.

The circumferential restraint plate (78) and the axial restraint plate (75) promote the thermal expansion of the resin member (61) in the radial direction of the casing (20) by the Poisson effect. Specifically, the circumferential direction suppression plate (78) suppresses thermal expansion of the resin member (61) by contacting the resin member (61) in the circumferential direction of the casing (20) and applying a compressive load. In addition, thermal expansion of the resin member (61) is promoted in the radial direction of the casing (20). The axial suppression plate (75) contacts the resin member (61) in the axial direction of the casing (20) and applies a compressive load to suppress thermal expansion of the resin member (61), and the casing ( The thermal expansion of the resin member (61) is promoted in the radial direction of 20). As a result, the resin member (61) and the wall portion (21) are kept in contact with each other, and the resin member (61) and the stator (41) are kept in contact with each other.

-Effects of the first embodiment-
The support structure (11) of the present embodiment includes a casing (20) having a wall portion (21), a stator (41) and a resin member which are supported in contact with the wall portion (21) of the casing (20). (61) and is provided in the casing (20) and the stator (41) to suppress thermal expansion of the resin member (61) in the axial direction and the circumferential direction of the casing (20), and A circumferential direction suppression plate (78) and an axial direction suppression plate (75) that promote thermal expansion of the resin member (61) in the radial direction of the casing (20) are provided. Therefore, the circumferential direction suppression plate (78) and the axial direction suppression plate (75) suppress the thermal expansion of the resin member (61) in the axial direction and the circumferential direction of the casing (20) and also in the radial direction of the casing (20). The thermal expansion of the resin member (61) is accelerated. By promoting the latter thermal expansion, the resin member (61) and the wall portion (21) are kept in contact with each other, and the resin member (61) and the stator (41) are kept in contact with each other. In other words, the resin member (61) and the wall portion (21) do not separate from each other due to thermal expansion. Therefore, the stator (41) and the resin member (61) are prevented from coming off the casing (20) due to the temperature rise.

Further, in the support structure (11) of the present embodiment, the circumferential direction suppression plate (78) and the axial direction suppression plate (75) are arranged such that the resin member (61) is arranged in the axial direction and the circumferential direction of the casing (20). The resin member (61) is suppressed in thermal expansion by making contact with and applying a compressive load. Therefore, the Poisson effect promotes thermal expansion of the resin member (61) in the radial direction of the casing (20) orthogonal to the axial direction and the circumferential direction of the casing (20).

In the support structure (11) of the present embodiment, the axial restraint plate (75) contacts a part of the resin member (61) in the radial direction of the casing (20). In other words, in a plan view, the axial restraint plate (75) and the resin member (61) are configured to come into contact with each other in a partial region of the region where the resin member (61) is arranged. In regions other than the above, the axial restraint plate (75) and the resin member (61) are configured so as not to come into contact with each other. Therefore, the degree to which the thermal expansion of the resin member (61) in the radial direction is promoted can be controlled. Here, the thermal expansion is most promoted when the axial restraint plate (75) contacts the entire radial direction of the resin member (61). In other words, in a plan view, in the case where the axial restraint plate (75) and the resin member (61) are configured to come into contact with each other in all the regions where the resin member (61) is arranged, Thermal expansion is most promoted. On the other hand, the thermal expansion is not promoted at all when the axial restraint plate (75) does not contact the resin member (61). Based on these relationships, the degree to which the thermal expansion of the resin member (61) in the radial direction of the casing (20) is accelerated can be controlled.

In the support structure (11) of the present embodiment, the supported body (41, 61) faces the wall portion (21) of the casing (20) with the resin member (61) interposed therebetween, and The stator (41) is made of a material different from the constituent material of the resin member (61). Therefore, the resin member (61) is arranged between the stator (41) and the wall portion (21). The circumferential restraint plate (78) and the axial restraint plate (75) prevent the supported bodies (41, 61) having the stator (41) and the resin member (61) from coming off the casing (20). ..

Further, in the support structure (11) of the present embodiment, the resin member (in the axial direction of the casing (20) is provided between the axial direction suppression plate (75) and the outer peripheral surface of the stator (41). A second step portion (74) is formed which suppresses thermal expansion of the resin member (61) by contact with the end portion of 61). Therefore, thermal expansion of the resin member (61) in the axial direction is suppressed by the contact between the axial direction suppression plate (75) and the end of the resin member (61), and the resin member (in the radial direction of the casing (20) ( The thermal expansion of 61) is promoted.

Further, in the support structure (11) of the present embodiment, in the radial direction of the casing (20), the linear expansion coefficient of the material forming the resin member (61) is the same as that of the support (20) between the wall portions (21). ) Is smaller than the linear expansion coefficient of the material of which it is composed. Therefore, as the ambient temperature of the resin member (61) and the support member (20) decreases, the support member (20) between the wall portions (21) in the radial direction of the casing (20) is better than the resin member (61). Also tries to shrink greatly. In the radial direction of the casing (20), a compressive load due to thermal contraction of the wall portion (21) is applied to the resin member (61). By applying a compressive load to the resin member (61), the resin member (61) contracts toward the stator (41), and the resin member (61) and the stator (41) are kept in contact with each other. Be done.

Further, in the support structure (11) of the present embodiment, the linear expansion coefficient of the material forming the resin member (61) is the wall portion (21) of the casing (20) in the radial direction of the casing (20). Is smaller than the linear expansion coefficient of the material constituting the. Therefore, when the temperature rises, the resin member (61) is less likely to thermally expand in the radial direction than the wall portion (21) of the casing (20). On the other hand, since the radial direction thermal expansion of the resin member (61) is promoted by the circumferential direction suppression plate (78) and the axial direction suppression plate (75), the stator (41) and The resin member (61) is prevented from coming off the casing (20). On the other hand, the resin member (61) is less likely to thermally contract in the radial direction than the wall portion (21) of the casing (20) when the temperature decreases. Therefore, the stator (41) and the resin member (61) are prevented from coming off the casing (20) due to the temperature decrease.

-Modification 1 of Embodiment 1-
A modified example 1 of the first embodiment will be described. The rotary compressor (10) of this modification is different from that of the first embodiment in the number of supporting contact portions (21a). Hereinafter, differences from the first embodiment will be mainly described.

As shown in FIG. 4, the stator (41) is supported by being sandwiched by the wall portion (21) of the casing (20) together with the resin member (61) at a plurality of locations (three locations in this example) in the circumferential direction. To be done. In other words, the stator (41) and the resin member (61) are in contact with and supported by the wall portion (21) of the casing (20) at three locations in the circumferential direction.

The part of the wall (21) of the casing (20) that comes into contact with the resin member (61) constitutes the support contact part (21a). In this example, the wall portion (21) has three supporting contact portions (21a). The number of supporting contact portions (21a) may be set arbitrarily.

In the plan view shown in FIG. 4, the center points of the outer surfaces of the resin member (61) adjacent to each other in the circumferential direction of the casing (20) (in other words, the contact surface of the resin member (61) with the wall portion (21)) are aligned with each other. The direction in which they are connected in a straight line is the adjacent direction (one of which is indicated by a broken line in FIG. 4). The adjacent direction is the center point of the inner surface of the supporting contact portion (21a) adjacent in the circumferential direction of the casing (20) (in other words, the contact surface of the supporting contact portion (21a) with the resin member (61)) in plan view. It is also the direction that connects the two in a straight line.

At this time, when the circumferential direction suppression plate (78) and the axial direction suppression plate (75) do not exist, the two adjacent resin members (61) or the supporting contact portions (21a) in the circumferential direction are adjacent to each other. In the direction, the rate of change of the distance between the outer surfaces of the adjacent resin members (61) per unit temperature is smaller than the rate of change of the distance between the inner surfaces of the adjacent support contact portions (21a) per unit temperature. In other words, when the circumferential restraint plate (78) and the axial restraint plate (75) are not present, as the ambient temperature of the resin member (61) and the support contact portion (21a) increases, the support contact portion (21a) increases. The wall portion (21), the stator (41) and the resin member (61) are thermally expanded so that (a) moves away from the resin member (61).

The circumferential direction suppression plate (78) contacts the resin member (61) in the circumferential direction of the casing (20) and applies a compressive load to suppress the thermal expansion of the resin member (61), and the casing ( The thermal expansion of the resin member (61) is promoted in the radial direction of 20). The axial suppression plate (75) contacts the resin member (61) in the axial direction of the casing (20) and applies a compressive load to suppress thermal expansion of the resin member (61), and the casing ( The thermal expansion of the resin member (61) is promoted in the radial direction of 20). As a result, the resin member (61) and the wall portion (21) are kept in contact with each other, and the resin member (61) and the stator (41) are kept in contact with each other. Although not shown in FIG. 4, the axial restraint plate (75) has the same structure as that of the first embodiment.

-Modification of Embodiment 1-
A modified example 2 of the first embodiment will be described. The rotary compressor (10) of the present modified example is different from that of the first embodiment in that an axial restraint ring (72) is provided in place of the axial restraint plate (75). Hereinafter, differences from the first embodiment will be mainly described.

The axial restraint ring (72) is an annular member that restrains thermal expansion of the resin member (61) in the axial direction of the casing (20). As shown in FIG. 5, the axial restraint ring (72) is fixed to the wall portion (21) of the casing (20) by, for example, press fitting. The axial restraint ring (72) projects inward in the radial direction of the casing (20) rather than the inner peripheral surface of the wall portion (21). A first step portion (71) is formed between the protruding portion and the inner peripheral surface of the wall portion (21). The projecting portion is in contact with the end of the resin member (61) in the axial direction of the casing (20). The axial restraint ring (72) is in contact with a part of the end portion of the resin member (61) in the radial direction of the casing (20). In addition, the said protrusion part does not need to be in contact with the edge part of the resin member (61) in a normal temperature state and a low temperature state, if it contacts the edge part of the resin member (61) in a high temperature state. The axial restraint ring (72) constitutes a first restraint member.

The circumferential direction suppression plate (78) contacts the resin member (61) in the circumferential direction of the casing (20) and applies a compressive load to suppress the thermal expansion of the resin member (61), and the casing ( The thermal expansion of the resin member (61) is promoted in the radial direction of 20). The axial restraint ring (72) contacts the resin member (61) in the axial direction of the casing (20) and applies a compressive load to restrain thermal expansion of the resin member (61), and the casing ( The thermal expansion of the resin member (61) is promoted in the radial direction of 20). As a result, the resin member (61) and the wall portion (21) are kept in contact with each other, and the resin member (61) and the stator (41) are kept in contact with each other. Although not shown in FIG. 5, the circumferential direction suppression plate (78) has the same configuration as that of the above embodiment.

In the support structure (11) of the present modification, the axial restraining ring (72) provided on the wall portion (21) of the casing (20) has the resin member (61) in the axial direction of the casing (20). (4) suppresses thermal expansion of the resin member (61) by contact with the end portion of (1). Therefore, the thermal expansion of the resin member (61) in the axial direction of the casing (20) is suppressed by the contact between the axial suppression ring (72) and the end of the resin member (61), and the radial direction of the casing (20). The thermal expansion of the resin member (61) is accelerated.

-Modification of Embodiment 3-
A modified example 3 of the first embodiment will be described. In the rotary compressor (10) of this modification, the axial length of the resin member (61) is different from that of Modification 2 of the first embodiment. Hereinafter, differences from the second modification of the first embodiment will be mainly described.

As shown in FIG. 6, the length of the resin member (61) is shorter than the length of the stator (41) in the axial direction of the casing (20). Correspondingly, the axial restraint ring (72) is arranged so as to contact the end portion of the resin member (61) in the axial direction of the casing (20). The length of the resin member (61) may be longer than the length of the stator (41) in the axial direction of the casing (20).

-Modification 4 of Embodiment 1-
A modified example 4 of the first embodiment will be described. The rotary compressor (10) of the present modification is different from the first embodiment in the configuration of the second step portion (74). Hereinafter, differences from the first embodiment will be mainly described.

As shown in FIG. 7, a stator recess (76) is formed on the outer peripheral surface of the stator (41). The stator recess (76) may be formed, for example, by having a plurality of steel plates forming the stator (41) having different outer diameters. In the axial direction of the casing (20), the length of the stator recess (76) is substantially equal to the length of the resin member (61). The resin member (61) is arranged so as to fit in the stator recess (76). A second stepped portion (74) is formed by the stator recess (76). The stator recess (76) constitutes a second recess.

In the support structure (11) of the present modification, the stator recess (76) formed in the stator (41) is brought into contact with the end of the resin member (61) in the axial direction, so that the resin member ( Suppress the thermal expansion of 61). Therefore, the contact between the side wall of the stator recess (76) and the end of the resin member (61) suppresses thermal expansion of the resin member (61) in the axial direction of the casing (20), and the diameter of the casing (20). Thermal expansion of the resin member (61) in the direction is promoted.

-Variation 5 of Embodiment 1-
A modified example 5 of the first embodiment will be described. The rotary compressor (10) of the present modification is different from the second modification of the first embodiment in the configuration of the first step portion (71). Hereinafter, differences from the second modification of the first embodiment will be mainly described.

As shown in FIG. 8, a casing recess (73) is formed on the inner peripheral surface of the wall (21) of the casing (20). In the axial direction of the casing (20), the length of the casing recess (73) is substantially equal to the length of the resin member (61). The resin member (61) is arranged so as to fit in the casing recess (73). A first step portion (71) is formed by the casing recess (73). The casing recess (73) constitutes a first recess.

In the support structure (11) of the present modification, the casing recess (73) formed in the wall (21) of the casing (20) has an end of the resin member (61) in the axial direction of the casing (20). The thermal expansion of the resin member (61) is suppressed by contact with the portion. Therefore, due to the contact between the side wall of the casing recess (73) and the end of the resin member (61), thermal expansion of the resin member (61) in the axial direction of the casing (20) is suppressed, and the radial direction of the casing (20). The thermal expansion of the resin member (61) is accelerated.

-Modification 6 of Embodiment 1-
A modified example 6 of the first embodiment will be described. The rotary compressor (10) of the present modification is different from the first embodiment in the structure of the insulating member. Hereinafter, differences from the first embodiment will be mainly described.

As shown in FIG. 9, the support structure (11) includes an insulator (63) instead of the resin member (61). The insulator (63) is configured by alternately stacking a plurality (five in this example) of small expansion parts (63a) and a plurality (four in this example) of large expansion parts (63b). To be done. The insulator (63) constitutes an insulating member and also constitutes a supported contact portion.

The small expansion section (63a) has the function of making it difficult for the stator (41) to come off the casing (20) when the temperature drops. The small expansion section (63a) extends from the inner peripheral surface of the casing (20) to the outer peripheral surface of the stator (41). The linear expansion coefficient of the small expansion section (63a) in the facing direction is smaller than the linear expansion coefficient of the material forming the wall section (21) of the casing (20). The small expansion section (63a) is made of ceramic, but may be made of an insulating material other than this.

The large expansion section (63b) has the function of making it difficult for the stator (41) to come off the casing (20) when the temperature rises. The large expansion section (63b) extends from the inner peripheral surface of the casing (20) to the outer peripheral surface of the stator (41). The large expansion portion (63b) has a linear expansion coefficient in the facing direction larger than that of the material forming the wall portion (21) of the casing (20). The large expansion part (63b) is made of an insulating resin, but may be made of an insulating material other than this.

In the support structure (11) of the present modification, the small expansion part (63a) of the insulator (63) is made of a material whose linear expansion coefficient in the facing direction constitutes the wall part (21) of the casing (20). A material having a coefficient of linear expansion smaller than that of the material of which the large expansion portion (63b) of the insulator (63) has a linear expansion coefficient in the facing direction of the wall portion (21) of the casing (20). It is composed of a material having a coefficient of linear expansion larger than that of the material. Therefore, the small expansion part (63a) of the insulator (63) is less likely to thermally contract in the facing direction than the wall part (21) of the casing (20) when the temperature decreases. Therefore, the stator (41) is prevented from coming off the casing (20) due to the temperature decrease. On the other hand, the large expansion part (63b) of the insulator (63) is more likely to thermally expand in the facing direction than the wall part (21) of the casing (20) when the temperature rises. Therefore, the stator (41) is prevented from coming off the casing (20) due to the temperature rise.

<<Embodiment 2>>
The second embodiment will be described. The rotary compressor (10) of the present embodiment differs from that of the first embodiment in the structure of the support structure. Hereinafter, differences from the first embodiment will be mainly described.

As shown in FIGS. 10 and 11, the support structure (11) includes a drive shaft (50), a rotor (42) of the electric motor (40), a resin member (61), and an axial restraint plate (75). Composed of and. The drive shaft (50) constitutes a support. The axial restraint plate (75) constitutes an expansion controller.

The rotor (42) and the resin member (61) are supported in contact with the wall portion (50a) of the drive shaft (50) (in other words, the support contact portion (50a)). The rotor (42) has a laminated structure in which a large number of steel plates are laminated in the axial direction. The rotor (42) has a plurality of permanent magnets (not shown). The length of the rotor (42) is substantially equal to the length of the resin member (61) in the axial direction of the drive shaft (50). The rotor (42) constitutes the main body of the supported body. The resin member (61) constitutes an insulating member and also constitutes a supported contact portion. The rotor (42) and the resin member (61) form a supported body. The shape of the rotor in FIG. 10 is merely an example.

The resin member (61) is a cylindrical member sandwiched between the wall portion (50a) of the drive shaft (50) and the rotor (42) of the electric motor (40). The resin member (61) is made of an insulating resin and electrically insulates the drive shaft (50) and the rotor (42). This insulating resin is, for example, fiber reinforced resin or LCP resin. It should be noted that, instead of the cylindrical resin member (61), a plurality of resin members that are spaced apart in the circumferential direction of the drive shaft (50) may be provided.

The resin member (61) has anisotropy regarding the coefficient of linear expansion. The drive shaft (50) is isotropic with respect to the linear expansion coefficient. Specifically, in the axial direction of the drive shaft (50), the linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the drive shaft (50). The linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the rotor (42) in the axial direction of the drive shaft (50). The axial direction of the drive shaft (50) is the first direction. In other words, in the first direction, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the wall portion (50a) of the support body (50). In the first direction, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the main body portion (42) of the supported body.

In the radial direction of the drive shaft (50), the linear expansion coefficient of the material forming the resin member (61) is smaller than the linear expansion coefficient of the material forming the support body (50) between the wall portions (50a). The “between the wall parts (50a)” is between a part of the wall part (50a) and another part of the wall part (50a) separated from the part. The "support (50) between the wall portions (50a)" is a support body (50) that constitutes between the wall portions (50a). When the support (50) is made of a single material, the “linear expansion coefficient of the material forming the support (50) between the wall portions (50a)” is the linear expansion coefficient of the material. .. When the support body (50) is composed of a plurality of materials, the “linear expansion coefficient of the material forming the support body (50) between the wall portions (50a)” is the linear expansion coefficient of each material and the support body. It is a coefficient determined by the shape of (50). This coefficient can be obtained by calculating the rate of change of the distance between the wall parts (50a) per unit temperature in a test or analysis. In other words, the “coefficient of linear expansion of the material forming the support body (50) between the wall portions (50a)” is the rate of change of the distance between the wall portions (50a) per unit temperature. In the radial direction of the drive shaft (50), the linear expansion coefficient of the material forming the resin member (61) is smaller than the linear expansion coefficient of the material forming the rotor (41). The radial direction of the drive shaft (50) is the opposing direction of the resin member (61) and the wall portion (50a). In other words, in the direction in which the supported contact portion (61) and the wall portion (50a) of the support body (50) face each other, the linear expansion coefficient of the material forming the supported contact portion (61) is the wall portion (50a). It is smaller than the linear expansion coefficient of the material forming the support body (50).

In the circumferential direction of the drive shaft (50), the linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the drive shaft (50). In the circumferential direction of the drive shaft (50), the linear expansion coefficient of the material forming the resin member (61) is larger than the linear expansion coefficient of the material forming the rotor (42). The circumferential direction of the drive shaft (50) is the second direction. In other words, in the second direction, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the wall portion (50a). In the second direction, the linear expansion coefficient of the material forming the supported contact portion (61) is larger than the linear expansion coefficient of the material forming the main body portion (42) of the supported body.

In the plan view shown in FIG. 10, the direction in which any two points of the resin member (61) are linearly connected is defined as the adjacent direction (one of which is shown by the broken line in FIG. 10). The adjacent direction is a straight line when two arbitrary points on the wall portion (50a) of the drive shaft (50) (in other words, the contact surface with the resin member (61) of the support contact portion (50a)) are seen in a plan view. It is also the direction to tie. The adjacent direction illustrated in FIG. 10 coincides with the radial direction of the drive shaft (50).

At this time, when the axial restraint plate (75) does not exist, the distance between the outer surfaces of the resin member (61) per unit temperature in the adjacent direction with respect to the resin member (61) or the supporting contact portion (50a). Is smaller than the rate of change in the distance between the inner surfaces of the rotor (42) per unit temperature. In other words, in the absence of the axial restraint plate (75), the rotor (42) separates from the resin member (61) as the ambient temperature of the resin member (61) and the rotor (42) rises. The rotor (42) and the resin member (61) thermally expand as they go. This is because the linear expansion coefficient of the rotor (42) is larger than the linear expansion coefficient of the resin member (61) in the radial direction of the drive shaft (50).

The axial restraint plate (75) is a plate-shaped member that restrains thermal expansion of the resin member (61) in the axial direction of the drive shaft (50). As shown in FIG. 11, the axial restraint plate (75) is fixed to the upper and lower ends of the rotor (42) and is located more radially inward of the drive shaft (50) than the inner peripheral surface of the rotor (42). It is protruding. A second step portion (74) is formed between the protruding portion and the inner peripheral surface of the rotor (42). The projecting portion is in contact with the end of the resin member (61) in the axial direction of the drive shaft (50). The axial suppression plate (75) is in contact with a part of the end portion of the resin member (61) in the radial direction of the drive shaft (50) (particularly, a part on the outer side in the radial direction). In addition, the said protrusion part does not need to be in contact with the edge part of the resin member (61) in a normal temperature state and a low temperature state, if it contacts the edge part of the resin member (61) in a high temperature state. The axial restraint plate (75) constitutes a second restraint member.

The axial restraint plate (75) promotes thermal expansion of the resin member (61) in the radial direction of the drive shaft (50) by the Poisson effect. Specifically, the axial direction suppression plate (75) suppresses thermal expansion of the resin member (61) by contacting the resin member (61) in the axial direction of the drive shaft (50) and applying a compressive load. And promotes thermal expansion of the resin member (61) in the radial direction of the drive shaft (50). As a result, the resin member (61) and the wall portion (50a) of the drive shaft (50) are kept in contact with each other, and the resin member (61) and the rotor (42) are kept in contact with each other.

-Effects of the second embodiment-
The support structure (11) of the present embodiment also provides the same effect as that of the first embodiment.

-Modification 1 of Embodiment 2-
A modified example 1 of the second embodiment will be described. The rotary compressor (10) of the present modified example is different from that of the second embodiment in that an axial restraint ring (72) is provided in place of the axial restraint plate (75). Hereinafter, differences from the second embodiment will be mainly described.

The axial restraint ring (72) is an annular member that restrains thermal expansion of the resin member (61) in the axial direction of the drive shaft (50). As shown in FIG. 12, the axial restraint ring (72) is fixed to the wall portion (50a) of the drive shaft (50) by, for example, an interference fit. The axial restraint ring (72) projects more radially outward of the drive shaft (50) than the wall portion (50a). A first step portion (71) is formed between the protruding portion and the wall portion (50a). The projecting portion is in contact with the end of the resin member (61) in the axial direction of the drive shaft (50). The axial restraint ring (72) is in contact with a part of the end of the resin member (61) in the radial direction of the drive shaft (50). In addition, the said protrusion part does not need to be in contact with the edge part of the resin member (61) in a normal temperature state and a low temperature state, if it contacts the edge part of the resin member (61) in a high temperature state. The axial restraint ring (72) constitutes a first restraint member.

The axial restraint ring (72) is in contact with the resin member (61) in the axial direction of the drive shaft (50) and applies a compressive load to restrain thermal expansion of the resin member (61) and to drive the resin member (61). The thermal expansion of the resin member (61) is promoted in the radial direction of the shaft (50). As a result, the resin member (61) and the wall portion (50a) are kept in contact with each other, and the resin member (61) and the rotor (42) are kept in contact with each other.

-Modification 2 of Embodiment 2-
A modified example 2 of the second embodiment will be described. In the rotary compressor (10) of this modification, the axial length of the resin member (61) is different from that of Modification 1 of the second embodiment. Hereinafter, differences from the first modification of the second embodiment will be mainly described.

As shown in FIG. 13, the length of the resin member (61) is shorter than the length of the rotor (42) in the axial direction of the drive shaft (50). Correspondingly, the axial restraint ring (72) is arranged so as to come into contact with the end of the resin member (61) in the axial direction of the drive shaft (50). The length of the resin member (61) may be longer than the length of the rotor (42) in the axial direction of the drive shaft (50).

-Modification 3 of Embodiment 2
A modified example 3 of the second embodiment will be described. The rotary compressor (10) of the present modification is different from the second embodiment in the configuration of the second step portion (74). Hereinafter, differences from the second embodiment will be mainly described.

As shown in FIG. 14, a rotor recess (82) is formed on the inner peripheral surface of the rotor (42). The rotor recess (82) may be formed, for example, by having a plurality of steel plates forming the rotor (42) having different inner diameters. The length of the rotor recess (82) in the axial direction of the drive shaft (50) is substantially equal to the length of the resin member (61). The resin member (61) is arranged to fit in the rotor recess (82). The rotor recess (82) forms the second step (74). The rotor recess (82) constitutes a second recess.

In the support structure (11) of the present modification, the rotor recess (82) formed in the rotor (42) comes into contact with the end portion of the resin member (61) in the axial direction, so that the resin member ( Suppress the thermal expansion of 61). Therefore, the contact between the side wall of the rotor recess (82) and the end of the resin member (61) suppresses thermal expansion of the resin member (61) in the axial direction of the drive shaft (50), and the drive shaft (50). The thermal expansion of the resin member (61) in the radial direction is accelerated.

-Modification 4 of Embodiment 2-
A modified example 4 of the second embodiment will be described. The rotary compressor (10) of the present modification is different from the first modification of the second embodiment in the configuration of the first step portion (71). Hereinafter, differences from the first modification of the second embodiment will be mainly described.

As shown in FIG. 15, the drive shaft recess (81) is formed in the wall portion (50a) of the drive shaft (50). In the axial direction of the drive shaft (50), the length of the drive shaft recess (81) is substantially equal to the length of the resin member (61). The resin member (61) is arranged to fit into the drive shaft recess (81). The drive shaft recess (81) forms a first step portion (71). The drive shaft recess (81) constitutes a first recess.

In the support structure (11) of the present modification, the drive shaft recess (81) formed in the wall portion (50a) of the drive shaft (50) has the resin member (61) in the axial direction of the drive shaft (50). (4) suppresses thermal expansion of the resin member (61) by contact with the end portion of (1). Therefore, the thermal expansion of the resin member (61) in the axial direction of the drive shaft (50) is suppressed by the contact between the side wall of the drive shaft recess (81) and the end of the resin member (61), and the drive shaft (50). The thermal expansion of the resin member (61) in the radial direction is accelerated.

-Variation 5 of Embodiment 2
A modified example 5 of the second embodiment will be described. The rotary compressor (10) of this modification is different from that of the second embodiment in the structure of the insulating member. Hereinafter, differences from the second embodiment will be mainly described.

As shown in FIG. 16, the support structure (11) includes an insulator (63) instead of the resin member (61). The insulator (63) is configured by alternately stacking a plurality (five in this example) of small expansion parts (63a) and a plurality (four in this example) of large expansion parts (63b). To be done. The insulator (63) constitutes an insulating member and also constitutes a supported contact portion.

The small expansion section (63a) has the function of making it difficult for the rotor (42) to come off the drive shaft (50) when the temperature rises. The small expansion section (63a) extends from the outer peripheral surface (in other words, the wall section (50a)) of the drive shaft (50) to the inner peripheral surface of the rotor (42). The linear expansion coefficient of the small expansion section (63a) in the facing direction is smaller than the linear expansion coefficient of the material forming the drive shaft (50). The small expansion section (63a) is made of ceramic, but may be made of an insulating material other than this.

The large expansion section (63b) has the function of making it difficult for the rotor (42) to come off the drive shaft (50) when the temperature drops. The large expansion section (63b) extends from the outer peripheral surface of the drive shaft (50) to the inner peripheral surface of the rotor (42). The large expansion section (63b) has a coefficient of linear expansion in the facing direction larger than that of the material forming the drive shaft (50). The large expansion part (63b) is made of an insulating resin, but may be made of an insulating material other than this.

In the support structure (11) of the present modified example, the small expansion portion (63a) of the insulator (63) has a linear expansion coefficient in the facing direction higher than that of the material forming the drive shaft (50). It is made of a small material, and the large expansion portion (63b) of the insulator (63) is made of a material having a linear expansion coefficient in the facing direction larger than that of the material forming the drive shaft (50). It Therefore, the small expansion part (63a) of the insulator (63) is less likely to thermally expand in the facing direction than the drive shaft (50) when the temperature rises. Therefore, the rotor (42) is prevented from coming off the drive shaft (50) due to the temperature rise. On the other hand, the large expansion part (63b) of the insulator (63) is more likely to be thermally contracted in the facing direction than the drive shaft (50) when the temperature decreases. Therefore, the rotor (42) is prevented from coming off the drive shaft (50) due to the temperature decrease.

<<Other Embodiments>>
The above embodiment may have the following configurations.

-First Modification-
For example, as shown in FIG. 17, the support structure (11) of the first modified example includes a casing (20), a resin member (62), and an expansion control bar (79).

The casing (20) extends in the axial direction (direction orthogonal to the paper surface in FIG. 17). The casing (20) includes three wall portions (21) each extending in the axial direction. The three wall portions (21) are integrally connected in a U-shape (or C-shape) in a plan view. The casing (20) constitutes a support.

The resin member (62) is a plate-like member supported by being sandwiched between two wall portions (21) facing each other. The resin member (62) extends between the two wall portions (21) facing each other and extends in the axial direction. The resin member (62) is entirely made of the same resin material.

The portion of the resin member (62) that contacts the wall portion (21) constitutes the supported contact portion (62a). A portion of the wall portion (21) that comes into contact with the resin member (62) constitutes a support contact portion (21a). In this example, there are two supported contact portions (62a) and two supporting contact portions (21a).

The expansion control bar (79) has a resin member (in the left-right direction in FIG. 17) orthogonal to the facing direction (the vertical direction in FIG. 17) of the supported contact portion (62a) and the supporting contact portion (21a). 62) A member for suppressing thermal expansion. The expansion control bar (79) is an elongated prismatic member extending in the axial direction. The expansion control bar (79) is fixed to the wall portion (21) so as to sandwich the supported contact portion (62a) of the resin member (62) in the first direction. The two expansion control bars (79) corresponding to one supported contact portion (62a) form a third step portion (77) between the wall portion (21) and the expansion control bar (79). The expansion control bar (79) constitutes an expansion control section.

The resin member (62) has anisotropy regarding the linear expansion coefficient. The casing (20) is isotropic with respect to the linear expansion coefficient. Specifically, in the direction in which the resin member (62) and the wall portion (21) face each other, the linear expansion coefficient of the material forming the resin member (62) is determined by the support (20,50) between the wall portions (21). Is smaller than the linear expansion coefficient of the material constituting the. In the first direction, the linear expansion coefficient of the material forming the resin member (62) is larger than the linear expansion coefficient of the material forming the wall portion (21). The anisotropy of the linear expansion coefficient of the material forming the resin member (62) constitutes the orientation direction of the fibrous substance contained in the material forming the resin member (62) or the resin member (62). It occurs corresponding to the orientation direction of the molecular chains of the material.

When the expansion control bar (79) is not present, the rate of change of the distance between the both end surfaces of the resin member (62) per unit temperature in the facing direction is equal to that of the distance between the inner surfaces of the support contact portion (21a). It is smaller than the rate of change per unit temperature. In other words, in the absence of the expansion control bar (79), as the ambient temperature of the resin member (62) and the supporting contact portion (21a) rises, the supporting contact portion (21a) moves away from the resin member (62). As it goes, the wall portion (21) and the resin member (62) thermally expand. This is because the linear expansion coefficient of the wall portion (21) is larger than the linear expansion coefficient of the resin member (62) in the facing direction.

The expansion control bar (79) suppresses thermal expansion of the resin member (62) by coming into contact with the resin member (62) in the first direction and applying a compressive load to the resin member (62), and also in the facing direction, the resin. The thermal expansion of the member (62) is promoted. This keeps the resin member (62) and the wall portion (21) in contact with each other.

-Second modification-
For example, in the above embodiment, the expansion control section (70) is provided on the casing (20) or the stator (41), or on the drive shaft (50) or the rotor (42). However, for example, the expansion control section (70) may be configured by a component that is indirectly fixed to the casing (20). In this case, the casing (20) and the component make up a support.

-Third Modification-
For example, in the above embodiment, the expansion control section (70) is provided on the casing (20) or the stator (41), or on the drive shaft (50) or the rotor (42). However, for example, the expansion control section (70) may be provided in the casing (20) and the stator (41), or the expansion control section (70) may be provided in the drive shaft (50) and the rotor (42). May be. As an example, it is conceivable to provide the casing (20) with the axial restraint ring (72) and to provide the stator (41) with the axial restraint plate (75).

-Fourth modification-
For example, in the above embodiment, thermal expansion of the resin member (61) is suppressed in the axial direction (first direction) and the circumferential direction (second direction) of the casing (20) or the drive shaft (50). However, thermal expansion of the resin member (61) may be suppressed in the axial direction or the circumferential direction of the casing (20) or the drive shaft (50). The first direction is not limited to the axial direction of the casing (20) or the drive shaft (50) as long as it is a direction orthogonal to the facing direction of the resin member (61) and the wall portion (21, 50a). .. Similarly, the second direction is not limited to the circumferential direction of the casing (20) or the drive shaft (50).

-Fifth Modification-
For example, in the above embodiment, the axial restraint plate (75), the circumferential restraint plate (78), and the axial restraint ring (72) are formed in a plate shape. However, these components may be replaced by any shaped component having a similar function.

-Sixth Modification-
For example, the casing (20) may be formed by combining a plurality of members having different constituent materials. As an example, in the wall portion (21) of the casing (20), the supporting contact portion (21a) and the portion other than the supporting contact portion (21a) may be made of different materials.

-Seventh modification-
For example, in the above embodiment, the axial restraint plate (75), the circumferential restraint plate (78), and the axial restraint ring (72) are configured to come into contact with the ends of the resin member (61). However, these constituent elements may be configured to come into contact with portions other than the ends of the resin member (61). For example, these components may be an uneven surface formed on the inner surface of the casing.

-Eighth modification-
For example, in the above embodiment, the resin member (61) is formed in a plate shape. However, the resin member (61) may be formed in a C shape (or a U shape) in a plan view. Further, the resin member (61) may be formed in a cylindrical shape. In this case, the adjoining direction of the above embodiment may be a direction that linearly connects arbitrary positions of the wall portions (21) facing each other with the supported body sandwiched therebetween in a plan view. As one example, the supported contact portion (61, 62a, 63) and the wall portion (21, 50a) face each other, the direction in which the wall portion (21, 50a) and the center of gravity of the supported member are linearly connected, or the supported member is supported. It is conceivable that the direction substantially perpendicular to the contact surface between the contact portion (61, 62a, 63) and the wall portion (21, 50a) is the adjacent direction.

-Ninth Modification-
For example, the resin member (61) may be formed integrally with the stator (41) or the rotor (42) or may be formed separately. In order to integrally form the stator (41) or the rotor (42) and the resin member (61), for example, the stator (41) or the rotor (42) and the resin member (61) may be bonded together. Alternatively, the resin member (61) may be formed on the stator (41) or the rotor (42) by injection molding. When the resin member (61) is formed by injection molding, the resin member (61) may be formed by injection molding only on the stator (41) or the rotor (42). The resin member (61) may be formed on the casing (20) or on the rotor (42) and the drive shaft (50) by injection molding.

-Tenth Modification-
For example, in the above embodiment, the main body of the supported body is composed of the stator (41) or the rotor (42). However, the main body of the supported body may be composed of the compression mechanism (30). Further, a support structure (11) in which the main body of the supported body is composed of a stator (41) or a rotor (42), and a support structure (11) in which the main body of the supported body is composed of a compression mechanism (30). And may be applied to one rotary compressor.

-Eleventh Modification-
For example, the casing (20) and the resin members (61, 62a) or the insulator (63) may be adhered to each other. Alternatively or additionally, the drive shaft (50) and the resin member (61) or the insulator (63) may be adhered to each other. Here, as a method of adhesion, a method using heat welding or an adhesive can be applied, and the method is not limited to these.

-Twelfth Modification-
For example, the magnitude relationship between the linear expansion coefficient of the resin member (61) and the linear expansion coefficient of the casing (20) or the drive shaft (50) is not limited to that described above, and may be set arbitrarily. As an example, in the radial direction of the casing (20) or the drive shaft (50), the linear expansion coefficient of the material forming the resin member (61) is the linear expansion of the material forming the casing (20) or the drive shaft (50). It may be larger than the coefficient. As another example, the linear expansion coefficient of the material forming the resin member (61) forms the casing (20) or the drive shaft (50) in the axial direction or the circumferential direction of the casing (20) or the drive shaft (50). It may be smaller than the linear expansion coefficient of the material.

-Thirteenth modification-
For example, in the above-described embodiment, the resin member (61) has anisotropy with respect to the linear expansion coefficient, but the resin member (61) may have isotropicity with respect to the linear expansion coefficient.

-Fourteenth Modification-
At least one of the support structure (11) including the casing (20) and the stator (41) and the support structure (11) including the drive shaft (50) and the rotor (42) is configured according to the present technique. Just do it. As an example, both support structures (11) may be constructed according to the present technique.

-Fifteenth Modification-
The support structure (11) of the present technology can be applied to any application other than the rotary compressor. For example, it is conceivable to apply the support structure (11) of the present technology to a bearing (supported body) and a housing (supporting body) that houses the bearing.

Although the embodiments and modifications have been described above, it will be understood that various changes in form and details can be made without departing from the spirit and scope of the claims. Further, the above-described embodiments and modified examples may be appropriately combined or replaced as long as the functions of the object of the present disclosure are not impaired.

As described above, the present disclosure is useful for a support structure and a rotary compressor including the support structure.

10 Rotary compressor 11 Support structure 20 Casing (support)
21 Wall 40 Electric motor 41 Stator (main body)
42 Rotor (main body)
50 Drive shaft (support)
50a wall (support contact)
61 Resin member (insulating member, supported contact part)
62 Resin material (supported body)
62a Supported contact part 63 Insulator (insulating member, supported contact part)
70 Expansion control section 71 First step section 72 Axial restraint ring (first restraint member)
73 Casing recess (first recess)
74 Second stepped portion 75 Axial restraint plate (second restraint member)
76 Stator recess (second recess)
81 Drive shaft recess (first recess)
82 Rotor recess (second recess)

Claims

A support (20,50) having a wall (21,50a) and a supported body (41,42,61) supported in contact with the wall (21,50a) of the support (20,50). A support structure (11) comprising:
A portion of the supported body (41, 42, 61 to 63) that comes into contact with the wall portion (21, 50a) of the support body (20, 50) is used as a supported contact portion (61, 62a, 63).
Provided on at least one of the support (20,50) and the supported body (41,42,61 to 63), the supported contact portion (61,62a,63) and the wall portion (21,50a) Suppresses thermal expansion of the supported contact portion (61, 62a, 63) in a first direction orthogonal to the opposing direction to and also supports thermal expansion of the supported contact portion (61, 62a, 63) in the opposing direction. A support structure comprising an expansion control section (70) for promoting the expansion.
In claim 1,
The expansion control section (70) contacts the supported contact section (61, 62a, 63) in the first direction to apply a compressive load to the supported contact section (61, 62a, 63). 63) A support structure characterized by suppressing thermal expansion.
In claim 2,
The expansion control section (70) is in contact with a part of the supported contact section (61, 62a, 63) in the facing direction, and is a supporting structure.
In any one of claims 1 to 3,
A direction orthogonal to the facing direction and orthogonal to the first direction is defined as a second direction,
The expansion control section (70) suppresses thermal expansion of the supported contact sections (61, 62a, 63) in the first direction and the second direction and the supported contact sections (61, 62a, 63) in the facing direction. 62a, 63) A support structure characterized by accelerating the thermal expansion of (62a, 63).
In any one of claims 1 to 4,
The support structure, wherein the material forming the supported contact portions (61, 62a, 63) is fiber reinforced resin or LCP resin.
In any one of claims 1 to 5,
The expansion control section (70) is provided on the support body (20, 50), and is brought into contact with the supported contact section (61, 62a, 63) in the first direction to support the supported contact section (61, 62). 62a, 63) having a first step portion (71) for suppressing thermal expansion of the support structure.
In claim 6,
The support structure, wherein the first step portion (71) is provided on the support body (20, 50) and is configured by a first suppressing member (72) protruding in the facing direction.
In claim 6,
The support structure, wherein the first step portion (71) is constituted by a first recess (73, 81) formed in the support body (20, 50).
In any one of claims 1 to 8,
The support structure, wherein the support (20, 50) and the supported contact portion (61, 62a, 63) are adhered to each other.
In any one of claims 1 to 9,
In the facing direction, the linear expansion coefficient of the material forming the supported contact portion (61, 62a, 63) is the linear expansion coefficient of the material forming the wall portion (21, 50a) of the support body (20, 50). A support structure characterized by being smaller than a coefficient.
In any one of claims 1 to 9,
In the facing direction, the linear expansion coefficient of the material forming the supported contact portion (61, 62a, 63) is the linear expansion coefficient of the material forming the wall portion (21, 50a) of the support body (20, 50). A support structure characterized by being larger than a coefficient.
In any one of claims 1 to 9,
A part of the supported contact portion (61, 62a, 63) has a coefficient of linear expansion in the facing direction, and a coefficient of linear expansion of a material forming the wall portion (21, 50a) of the support (20, 50). Composed of smaller materials,
The other part of the supported contact portion (61, 62a, 63) is made of a material whose linear expansion coefficient in the facing direction constitutes the wall portion (21, 50a) of the support body (20, 50). A support structure characterized by being made of a material having a coefficient of expansion larger than that of the material.
In any one of claims 1 to 12,
The supported body (41, 42, 61 to 63) faces the wall portion (21, 50a) of the support body (20, 50) with the supported contact portion (61, 62a, 63) interposed therebetween, Further, the support structure is characterized by having a main body portion (41, 42) made of a material different from the constituent material of the supported contact portions (61, 62a, 63).
In claim 13,
The expansion control section (70) is provided on the main body section (41, 42), and is brought into contact with the supported contact section (61, 62a, 63) in the first direction to support the supported contact section (61, 42). 62a, 63) having a second step portion (74) for suppressing thermal expansion of the support structure.
In claim 14,
The support structure, wherein the second step portion (74) is provided on the main body portion (41, 42) and is constituted by a second suppressing member (75) protruding in the facing direction.
In claim 14,
The support structure, wherein the second step portion (74) is constituted by a second recess (76, 82) formed in the body portion (41, 42).
A rotary compressor (10) comprising the support structure (11) according to any one of claims 13 to 16,
A tubular casing (20) constituting the support (20, 50),
An electric motor (40) having a stator (41) constituting the main body (41, 42) of the supported body (41, 42, 61 to 63);
The supported contact portions (61, 62a, 63) of the supported bodies (41, 42, 61 to 63) are formed, and they are located between the casing (20) and the stator (41). A rotary compressor comprising: insulating members (61, 63) that insulate each other.
A rotary compressor (10) comprising the support structure (11) according to any one of claims 13 to 16 or a rotary compressor (10) according to claim 17,
A drive shaft (50) constituting the support (20,50),
An electric motor (40) having a rotor (42) constituting the main body (41, 42) of the supported body (41, 42, 61 to 63);
The supported contact portions (61, 62a, 63) of the supported bodies (41, 42, 61-63) are formed, and are located between the drive shaft (50) and the rotor (42). An insulating member (61, 63) that insulates each other from each other.
In any one of claims 1 to 11,
A supporting structure characterized in that the whole of the supported bodies (41, 42, 61 to 63) is made of the same material as the constituent material of the supported contact portions (61, 62a, 63).