EP3361097A1

EP3361097A1 - External leg for compressor, and compressor

Info

Publication number: EP3361097A1
Application number: EP18155521.0A
Authority: EP
Inventors: Shunsuke Yakushiji; Yogo Takasu
Original assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Current assignee: Mitsubishi Heavy Industries Thermal Systems Ltd
Priority date: 2017-02-09
Filing date: 2018-02-07
Publication date: 2018-08-15
Also published as: JP2018127981A

Abstract

An external leg (8) for a compressor, the external leg (8) being fixed to a bottom end portion of a housing outside the housing, the housing accommodating therein a compression mechanism, the external leg (8) being formed of a metal plate, includes: a fixing portion (8A) that is fixed to the bottom end portion of the housing and that is plate shaped; leg portions (8B) that are formed of plate piece members extending out in plural lateral directions continuously from the fixing portion (8A) and that have attachment holes (8B)a formed at extended ends of the leg portions (8B); and reinforcement portions (8C) that are formed of recessed portions having planes (8Ca) on lower end portions of the recessed portions, the lower end portions being recessed between the fixing portion (8A) and the attachment holes (8Ba) in the leg portions (8B).

Description

Field

The present invention relates to: an external leg for fixing a compressor; and a compressor to which the external leg is applied.

Background

As an external leg for a compressor, for example, a support leg according to Patent Literatures 1 and 2 is described as having: a container support surface that is made of a steel plate and that supports an airtight compressor container at a central portion thereof; an attachment hole provided in a peripheral protruded end portion thereof; a reinforcement bent portion formed at a linear peripheral edge portion thereof; and a mountain shaped rib formed on a plate surface between the container support surface and the attachment hole. In Patent Literatures 1 and 2, it is described that resonance of sound in a low frequency region is prevented by increase in flexural rigidity for increase in natural frequency through use of the mountain shaped rib formed on the plate surface between the container support surface and the attachment hole.

Citation List

Patent Literature

Patent Literature 1: Japanese Unexamined Utility Model Application, Publication No. S63-183484 A
Patent Literature 2: Japanese Unexamined Utility Model Application, Publication No. H03-102072 A

Summary

Technical Problem

If a compressor falls at the time of manufacture thereof or at the time of installation thereof, an external leg provided to extend outside the compressor may be deformed and may become unable to serve functions as a leg for fixing the compressor. Improvement in the flexural rigidity in Patent Literatures 1 and 2 is for the increase in natural frequency, and thus does not lead to improvement in strength upon such falling.
The present invention solves the above described problem and an object thereof is to provide an external leg for a compressor, and the compressor, which enable improvement in strength thereof.

Solution to Problem

An external leg for a compressor according to an embodiment of the present invention, the external leg being fixed to a bottom end portion of a housing outside the housing, the housing accommodating therein a compression mechanism, the external leg being formed of a metal plate, includes a fixing portion that is fixed to the bottom end portion of the housing and that is plate shaped, leg portions that are formed of plate piece members extending out in plural lateral directions continuously from the fixing portion and that have attachment holes formed at extended ends of the leg portions, and reinforcement portions that are formed of: recessed portions having planes on lower end portions of the recessed portions, the lower end portions being recessed between the fixing portion and the attachment holes in the leg portions; or protruding portions having planes on upper end portions of the protruding portions, the upper end portions protruding between the fixing portion and the attachment holes in the leg portions.
In the external leg for the compressor, according to an embodiment of the present invention, it is preferable that the reinforcement portions each have an inner surface formed along an outer peripheral shape of the bottom end portion of the housing, and an outer surface extending toward the attachment hole respectively from ends of the inner surface.
In the external leg for the compressor, according to an embodiment of the present invention, it is preferable that side edges connected between the respective leg portions are each formed in a curved shape recessed toward the housing.
In the external leg for the compressor, according to an embodiment of the present invention, the bottom end portion of the housing may be closed with the compression mechanism being accommodated in the housing, and the fixing portion may have a fixing hole into which the bottom end portion of the housing is fitted.
In the external leg for the compressor, according to an embodiment of the present invention, the bottom end portion of the housing may be open with the compression mechanism being accommodated in the housing, and the fixing portion may also serve as a bottom plate closing the bottom end portion of the housing.
A compressor according to an embodiment of the present invention includes a compression mechanism, a housing that accommodates therein the compression mechanism, and the external leg for the compressor according to any one described above, the external leg being fixed to a bottom end portion of the housing outside the housing.

Advantageous Effects of Invention

According to the present invention, leg portions of an external leg include reinforcement portions having planes formed on recessed lower end portions thereof or protruding upper end portions thereof, between a fixing portion and attachment holes. The center of gravity of a compressor is present on or extremely near a central line of a housing, and the leg portions extend out in extending directions intersecting (orthogonal to) the central line, so as to go away from the center of gravity. The reinforcement portions are provided between the fixing portion and the attachment holes, midway in the extending directions of the leg portions, and have the planes formed on the recessed lower end portions or the protruding upper end portions. Therefore, flexural rigidity in a vertical direction, in which the leg portions bend with respect to the extending directions, and rigidity in twisting directions, in which the leg portions rotate based on the extending directions, are able to be improved. As a result, deformation is able to be prevented by further improvement in strength. What is more, by the improvement in flexural rigidity and torsional rigidity of the leg portions, resonance with vibration of the compressor is able to be reduced, and noise due to the vibration is also able to be reduced.

Brief Description of Drawings

FIG. 1 is a sectional side elevation of a compressor to which an external leg for the compressor, according to an embodiment of the present invention, is applied.
FIG. 2 is a perspective view of the external leg for the compressor, according to the embodiment of the present invention.
FIG. 3 is a plan view of the external leg for the compressor, according to the embodiment of the present invention.
FIG. 4 is a sectional side elevation of the external leg for the compressor, according to the embodiment of the present invention.
FIG. 5 is a sectional side elevation of another example of the external leg for the compressor, according to the embodiment of the present invention.
FIG. 6 is a sectional side elevation of another example of a bottom end portion of the compressor and the external leg for the compressor, according to the embodiment of the present invention.

Description of Embodiments

Hereinafter, an embodiment according to the present invention will be described in detail, based on the drawings. The invention is not limited by this embodiment. Further, components in the embodiment include any component that is easily substitutable by those skilled in the art or any component that is substantially the same.
FIG. 1 is a sectional side elevation of a compressor to which an external leg for the compressor, according to the embodiment, is applied.
FIG. 1 illustrates a scroll compressor serving as a compressor 1. Further, the compressor 1 of this embodiment is placed in a refrigerant flow channel, through which a refrigerant is circulated in an air conditioner, a refrigerator, or the like. The compressor according to this embodiment is not necessarily a scroll compressor, and may be, for example, a rotary compressor.
As illustrated in FIG. 1, the compressor 1 includes, inside a housing 3: a motor 5, which is a driving means; and a compression mechanism 7, which is driven by the motor 5.
The housing 3 includes: a housing body 3a, which extends vertically, and is cylindrical; a bottom portion 3b, which closes a lower end of the housing body 3a, and is circular; and a lid portion 3c, which closes an upper end of the housing body 3a, and is circular; and the housing 3 serves as a pressure vessel, the whole of which is airtight. The housing body 3a has, at a side portion thereof, an inlet pipe 9 provided therein, through which the refrigerant is introduced into the housing 3. The bottom portion 3b forms a bottom end portion of the housing 3, and an external leg (external leg for the compressor) 8 is fixed to the external bottom of the bottom portion 3b. Provided at an upper portion of the lid portion 3c is a discharge pipe 11, through which the refrigerant compressed by the compression mechanism 7 is discharged. The housing 3 has a discharge cover 13 provided between the housing body 3a and the lid portion 3c, and the interior of the housing 3 is partitioned into: a low pressure chamber 3A lower than the discharge cover 13; and a high pressure chamber 3B upper than the discharge cover 13. The discharge cover 13 has: an opening hole 13a formed therein, which provides communication between the low pressure chamber 3A and the high pressure chamber 3B; and a discharge reed valve 13b provided therein, which opens and closes the opening hole 13a. Further, the bottom inside the housing 3 is formed as an oil sump, where lubricating oil is stored.
The motor 5 includes a stator 15, a rotor 17, and a rotating shaft 19. The stator 15 is fixed, at the substantial center of the housing body 3a in a vertical direction thereof, to an inner wall surface of the housing body 3a. The rotor 17 is provided rotatably with respect to the stator 15. A longitudinal direction of the rotating shaft 19 is arranged vertically, with respect to the rotor 17. The motor 5 rotates the rotor 17 by supply of power from outside of the housing 3, and the rotating shaft 19 is rotated, together with the rotor 17.
The rotating shaft 19 is provided, such that its end portions protrude upward and downward from the rotor 17, and the upper end portion is supported by an upper bearing 21 and the lower end portion is supported by a lower bearing 23, rotatably, based on a shaft center CE extending in the vertical direction, with respect to the housing body 3a. At an upper end of the rotating shaft 19, an eccentric pin 25, which protrudes upward along an eccentric center LE eccentric with respect to the shaft center CE, is formed. The compression mechanism 7 is connected to the upper end of the rotating shaft 19 having this eccentric pin 25. A detailed configuration of this eccentric pin 25 will be described later. Further, inside the rotating shaft 19 and the eccentric pin 25, an oil feeding hole 27 penetrating vertically therethrough is formed. Furthermore, a lower end of the rotating shaft 19 is provided to reach the oil sump, and an oil feeding pump 29 is provided at that lower end. The oil feeding pump 29 feeds the lubricating oil stored in the oil sump in association with the rotation of the rotating shaft 19, to the oil feeding hole 27 of the rotating shaft 19.
The upper bearing 21 rotatably supports the rotating shaft 19 with the upper end portion of the rotating shaft 19 penetrating therethrough. On an upper surface of the upper bearing 21, a recessed portion 21a is formed to surround the upper end portion of the rotating shaft 19 penetrating through the upper bearing 21. The recessed portion 21a accommodates therein a bush assembly 37, which will be described later, and stores therein the lubricating oil fed by the oil feeding pump 29 through the oil feeding hole 27. The stored lubricating oil is supplied to the compression mechanism 7.
Further, at a portion of an outer periphery of the upper bearing 21, a notch 21b is formed such that a gap is formed between the inner wall surface of the housing body 3a of the housing 3 and the upper bearing 21, and an oil discharge hole 21c that provides communication between the notch 21b and the recessed portion 21a is formed in the upper bearing 21. Furthermore, below the notch 21b of the upper bearing 21, a cover plate 31 is provided. The cover plate 31 is provided to extend in the vertical direction. The cover plate 31 is formed to be bent, such that both side ends of the cover plate 31 face the inner wall surface of the housing body 3a to cover a periphery of the notch 21b; and is formed such that a lower end of the cover plate 31 is bent to gradually approach the inner wall surface of the housing body 3a. Through the oil discharge hole 21c, the lubricating oil stored excessively in the recessed portion 21a is discharged to an outer periphery of the upper bearing 21 from the notch 21b. The cover plate 31 receives the lubricating oil discharged from the notch 21b and guides the received lubricating oil toward the inner wall surface of the housing body 3a. The lubricating oil guided toward the inner wall surface by the cover plate 31 goes along the inner wall surface and is returned to the oil sump at the bottom inside the housing 3, by the cover plate 31.
The compression mechanism 7 is arranged above the upper bearing 21 in the low pressure chamber 3A below the discharge cover 13 inside the housing 3, and includes a fixed scroll 33, an orbiting scroll 35, and the bush assembly 37.
In the fixed scroll 33, on an inner surface (lower surface in FIG. 1) of a fixed end plate 33a fixed inside the housing 3, a fixed lap 33b, which is spiral, is formed. At a central portion of the fixed end plate 33a, a discharge hole 33c is formed.
On an inner surface (upper surface in FIG. 1) of a movable end plate 35a of the orbiting scroll 35, the movable end plate 35a facing the inner surface of the fixed end plate 33a of the fixed scroll 33, a movable lap 35b, which is spiral, is formed. By the movable lap 35b of the orbiting scroll 35 engaging with the fixed lap 33b of the fixed scroll 33 with their phases shifted from each other, a compression chamber partitioned by the respective end plates 33a and 35a and the respective laps 33b and 35b is formed. Further, in the orbiting scroll 35, on an outer surface (lower surface in FIG. 1) of the movable end plate 35a; a boss 35c to which the eccentric pin 25 of the rotating shaft 19 is connected, to which eccentric rotation of the eccentric pin 25 is transmitted, and which is cylindrical, is formed. Furthermore, the orbiting scroll 35 is caused to orbit with its rotation prevented, based on the eccentric rotation of the eccentric pin 25, by a rotation preventing mechanism 39, such as a known Oldham link, which is arranged between the outer surface of the movable end plate 35a and the upper bearing 21.
The bush assembly 37 is accommodated in the above described recessed portion 21a of the upper bearing 21, is interposed between the eccentric pin 25 of the rotating shaft 19 and the boss 35c of the orbiting scroll 35, and transmits the rotational movement of the eccentric pin 25 as orbital movement of the orbiting scroll 35. Further, the bush assembly 37 is provided to be slidingly movable in a radial direction of the eccentric pin 25 in order to maintain the engagement between the movable lap 35b of the orbiting scroll 35 and the fixed lap 33b of the fixed scroll 33. A detailed configuration of this bush assembly 37 will be described later.
In this compression mechanism 7, a low pressure refrigerant introduced into the low pressure chamber 3A in the housing 3 via the inlet pipe 9 is compressed while being taken into the compression chamber between the fixed scroll 33 and orbiting scroll 35, by the orbiting scroll 35 orbiting. The compressed high pressure refrigerant is discharged to an outer surface side of the fixed end plate 33a from the discharge hole 33c of the fixed scroll 33, opens the discharge reed valve 13b of the discharge cover 13 by its own pressure, reaches the high pressure chamber 3B from the opening hole 13a, and is discharged outside the housing 3 via the discharge pipe 11.
Hereinafter, details of the external leg (external leg for the compressor) 8 will be described. FIG. 2 is a perspective view of the external leg for the compressor, according to the embodiment. FIG. 3 is a plan view of the external leg for the compressor, according to the embodiment. FIG. 4 is a sectional side elevation of the external leg for the compressor, according to the embodiment.
The external leg 8 is fixed to a bottom surface of the bottom portion 3b, at the bottom portion 3b forming the bottom end portion of the housing 3, as described above. The external leg 8 is made of a metal plate, and includes a fixing portion 8A, leg portions 8B, and reinforcement portions 8C.
The fixing portion 8A is a plate shaped member forming a central portion of the external leg 8, and is fixed by welding or the like so as to be stuck onto the bottom surface of the bottom portion 3b of the housing 3. The bottom portion 3b of the housing 3 is formed in a bowl shape that is a protruding curved shape, at a lower region outside the housing 3, and the fixing portion 8A is formed to be curved in a protruding curved shape in the lower region, along the protruding curved shape of the bottom portion 3b. Further, the fixing portion 8A has a fixing hole 8Aa formed therein, into which the protruding curved bottom of the bottom portion 3b of the housing 3 is fitted. By being fitted with the protruding curved bottom of the bottom portion 3b of the housing 3, the fixing hole 8Aa enables a fixed state with the bottom portion 3b to be strengthened, and the fixing hole 8Aa also contributes to weight reduction of the external leg 8.
The leg portions 8B are formed of plate piece members that extend in plural lateral directions, continuously from the fixing portion 8A. According to this embodiment, the leg portions 8B are formed to extend in four directions laterally from the fixing portion 8A. The lateral directions (also referred to as "extending directions"), in which the leg portions 8B extend are directions intersecting (orthogonal to, according to this embodiment) the above described shaft center CE that is a central line of the housing 3 (housing body 3a, bottom portion 3b, and lid portion 3c) that is cylindrical. Each of the leg portions 8B has an attachment hole 8Ba formed therein, at an extended end thereof. The attachment holes 8Ba are used for, for example, attachment to an outdoor unit of an air conditioner or a refrigerator. Specifically, although not clearly illustrated in the drawings, a bush is provided at bottom surfaces of the leg portions 8B, and attachment to a base plate of the outdoor unit at a fixed side is carried out through attachment bolts that penetrate through this bush and the attachment holes 8Ba. The bush functions as vibration preventing rubber that is made of rubber or the like, and that prevents vibration of the compressor 1 from being transmitted to the outdoor unit.
The reinforcement portions 8C are formed, in the leg portions 8B, between the fixing portion 8A and the attachment holes 8Ba. The reinforcement portions 8C in FIG. 1 to FIG. 4 are formed as recessed portions that are recessed downward. The recessed portions serving as the reinforcement portions 8C are formed by press working of the metal plate forming the external leg 8 downward. Each of the recessed portions serving as the reinforcement portions 8C has a plane 8Ca formed on a lower end portion thereof. Further, each of the recessed portions serving as the reinforcement portions 8C has, on a circumference thereof: an inner surface 8Cb formed in a circular arc shape along an outer peripheral shape (circular shape) of the bottom portion 3b forming the bottom end portion of the housing 3; and an outer surface 8Cc extending toward the attachment hole 8Ba respectively from ends of the inner surface 8Cb. That is, each of the recessed portions serving as the reinforcement portions 8C has: the plane 8Ca formed on the recessed bottom thereof; the inner surface 8Cb formed along the outer peripheral shape of the bottom portion 3b of the housing 3, at the fixing portion 8A side of the circumference; and the outer surface 8Cc formed toward the attachment hole 8Ba respectively from the ends of the inner surface 8Cb. The circumference of each of the recessed portions serving as the reinforcement portions 8C is formed, with the inner surface 8Cb and the outer surface 8Cc, in a substantially triangular shape in a plan view thereof.
As described above, the external leg 8 according to this embodiment includes the reinforcement portions 8C having the planes 8Ca formed on the recessed lower end portions thereof, between the fixing portion 8A and the attachment holes 8Ba in the leg portions 8B. The center of gravity of the compressor 1 is present on or extremely near the CE that is the central line of the cylindrical housing 3 (housing body 3a, bottom portion 3b, and lid portion 3c), and the leg portions 8B extend in extending directions H (see FIG. 3 and FIG. 4) intersecting (orthogonal to) the shaft center CE, so as to go away from the center of gravity. The reinforcement portions 8C are provided between the fixing portion 8A and the attachment holes 8Ba, midway in the extending directions of the leg portions 8B, and have the planes 8Ca formed on the recessed lower end portions thereof. Therefore, as indicated with arrows V in FIG. 4, flexural rigidity in the vertical direction, in which the leg portions 8B bend with respect to the extending directions H, and as indicated with arrows R in FIG. 3, rigidity in twisting directions, in which the leg portions 8B rotate based on the extending directions H, are able to be improved. As a result, deformation is able to be prevented by improvement in strength.
What is more, by the improvement in the flexural rigidity and the torsional rigidity of the leg portions 8B, resonance with vibration of the compressor 1 is able to be reduced, and noise due to the vibration is also able to be reduced.
Each of the planes 8Ca is preferably provided on an inner bottom surface and an outer bottom surface of the recessed portion serving as the reinforcement portion 8C in terms of the improvement in the rigidity, but the rigidity is able to be improved even if the plane 8Ca is provided on at least one of the inner bottom surface and outer bottom surface of the recessed portion serving as the reinforcement portion 8C.
Further, in the external leg 8 according to this embodiment, each of the reinforcement portions 8C has the inner surface 8Cb formed along the outer peripheral shape of the bottom portion 3b that is the bottom end portion of the housing 3 and the outer surface 8Cc extending toward the attachment hole 8Ba respectively from the ends of the inner surface 8Cb. Therefore, in addition to the effects due to the planes 8Ca, the flexural rigidity and the torsional rigidity of the leg portions 8B are able to be improved, and the deformation is able to be prevented even more by further improvement in the strength.
The inner surface 8Cb and the outer surface 8Cc are preferably provided on an inner surface and an outer surface of the recessed portion serving as the reinforcement portion 8C, in terms of improvement in the rigidity, but the rigidity is able to be improved even if the inner surface 8Cb and the outer surface 8Cc are provided on at least one of the inner surface and the inner bottom of the outer surface of the recessed portion serving as the reinforcement portion 8C.
Further, in the external leg 8 according to this embodiment, as illustrated in FIG. 2 and FIG. 3, side edges 8D connected between the respective leg portions 8B are each formed in a curved shape that is recessed toward the housing 3. That is, the external leg 8 is formed, such that the curved side edges 8D between the respective leg portions 8B are connected to one another. Therefore, as compared to a configuration where straight lined side edges 8D between respective leg portions 8B are connected to one another, by decrease in area that is flat shaped, acceleration, at which the vibration is transmitted in the vertical direction, is able to be kept low. As a result, noise due to the vibration is able to be reduced even more. Since the external leg 8 according to this embodiment has bent portions 8Da formed by folding of the side edges 8D between the respective leg portions 8B downward, the rigidity is able to be increased, and reduction in the rigidity due to the decrease in the flat shaped area resulting from the curved formation is able to be prevented.
According to the above described embodiment, the fixing portion 8A is formed to be curved in the downward protruding curved shape along the protruding curved shape of the bottom portion 3b of the housing 3. Further, the side edges 8D between the respective leg portions 8B each have the bent portion 8Da that has been subjected to the folding downward. Furthermore, the reinforcement portions 8C are formed as the recessed portions by the press working downward. As described above, all of the external leg 8 according to the embodiment is able to be formed by processing downward from above, and thus is excellent in processability.
FIG. 5 is a sectional side elevation of another example of the external leg for the compressor according to the embodiment. In FIG. 5, the same reference signs will be assigned to components equivalent to those of the above described embodiment, and description thereof will be omitted.
An external leg 8 illustrated in FIG. 5 has reinforcement portions 8C, each of which is formed between a fixing portion 8A and an attachment hole 8Ba, and which are formed as protruding portions protruding upward. The protruding portions serving as the reinforcement portions 8C are formed by press working of a metal plate forming the external leg 8 downward, with the metal plate having been placed upside down. Each of the protruding portions serving as the reinforcement portions 8C has a plane 8Ca formed on an upper end portion thereof. Further, each of the protruding portions serving as the reinforcement portions 8C has, on a circumference thereof: an inner surface 8Cb formed in a circular arc shape along an outer peripheral shape (circular shape) of the bottom portion 3b forming the bottom end portion of the housing 3; and an outer surface 8Cc extending toward the attachment hole 8Ba respectively from ends of the inner surface 8Cb. That is, each of the protruding portions serving as the reinforcement portions 8C has: the plane 8Ca formed on a protruding top portion thereof; the inner surface 8Cb formed along the outer peripheral shape of the bottom portion 3b of the housing 3, at the fixing portion 8A side of the circumference; and the outer surface 8Cc formed toward the attachment hole 8Ba respectively from the ends of the inner surface 8Cb. The circumference of the protruding portion serving as the reinforcement portion 8C is formed, with the inner surface 8Cb and the outer surface 8Cc, in a substantially triangular shape in a plan view thereof.
As described above, the external leg 8 according to this embodiment may include the reinforcement portions 8C having the planes 8Ca formed on the protruding upper end portions thereof, between the fixing portion 8A and the attachment holes 8Ba in the leg portions 8B. The center of gravity of the compressor 1 is present on or extremely near the shaft center CE that is the central line of the cylindrical housing 3 (housing body 3a, bottom portion 3b, and lid portion 3c), and the leg portions 8B extend in extending directions H (see FIG. 3 and FIG. 4) intersecting (orthogonal to) the shaft center CE, so as to go away from the center of gravity. The reinforcement portions 8C are provided between the fixing portion 8A and the attachment holes 8Ba, midway in the extending directions of the leg portions 8B, and have the planes 8Ca formed on the protruding upper end portions thereof. Therefore, as indicated with arrows V in FIG. 5, flexural rigidity in the vertical direction, in which the leg portions 8B bend with respect to the extending directions H, and as indicated with the arrows R in FIG. 3, rigidity in twisting directions, in which the leg portions 8B rotate based on the extending directions H, are able to be improved. As a result, deformation is able to be prevented by improvement in strength.
What is more, by the improvement in flexural rigidity and torsional rigidity of the leg portions 8B, resonance with the vibration of the compressor 1 is able to be reduced, and noise due to the vibration is also able to be reduced.
Each of the planes 8Ca is preferably provided on an inner bottom surface and an outer bottom surface of the protruding portion serving as the reinforcement portion 8C in terms of the improvement in the rigidity, but the rigidity is able to be improved even if the plane 8Ca is provided on at least one of the inner bottom surface and outer bottom surface of the protruding portion serving as the reinforcement portion 8C.
Further, in the external leg 8 according to this embodiment, each of the reinforcement portions 8C has the inner surface 8Cb formed along the outer peripheral shape of the bottom portion 3b that is the bottom end portion of the housing 3 and the outer surface 8Cc extending toward the attachment hole 8Ba respectively from the ends of the inner surface 8Cb. Therefore, in addition to the effects due to the planes 8Ca, the flexural rigidity and the torsional rigidity of the leg portions 8B are able to be improved, and the deformation is able to be prevented even more by further improvement in the strength.
The inner surface 8Cb and the outer surface 8Cc are preferably provided on an inner surface and an outer surface of the protruding portion serving as the reinforcement portion 8C in terms of improvement in the rigidity, but the rigidity is able to be improved even if the inner surface 8Cb and the outer surface 8Cc are provided on at least one of the inner surface and the inner bottom of the outer surface of the protruding portion serving as the reinforcement portion 8C.
FIG. 6 is a sectional side elevation of another example of the bottom end portion of the compressor and the external leg for the compressor, according to the embodiment. In FIG. 6, the same reference signs will be assigned to components equivalent to those of the above described embodiment, and description thereof will be omitted.
A compressor 1 according to another example illustrated in FIG. 6 does not have the above described bottom portion 3b in the housing 3, and an external leg 8 is fixed by welding or the like to a lower end portion of a housing body 3a. The external leg 8 closes the lower end portion of the housing body 3a, and makes the whole housing 3 into an airtight pressure vessel, and thus does not have the above described fixing hole 8Aa in a fixing portion 8A thereof.
In this compressor, the housing 3 accommodates therein a compression mechanism 7 (not illustrated in the drawings), a bottom end portion of the housing body 3a is open, and the fixing portion 8A also serves as a bottom plate that closes the bottom end portion of the housing body 3a in the housing 3.
In the compressor according to this example, the above described external leg 8 may be provided. By this external leg 8, as indicated with the arrows V in FIG. 4 and FIG. 5, flexural rigidity in a vertical direction, in which leg portions 8B bend with respect to extending directions H, and as indicated with the arrows R in FIG. 3, rigidity in twisting directions, in which the leg portions 8B rotate based on the extending directions H, are able to be improved. As a result, deformation is able to be prevented by further improvement in strength. What is more, by the improvement in flexural rigidity and torsional rigidity of the leg portions 8B, resonance with vibration of the compressor is able to be reduced, and noise due to the vibration is also able to be reduced.
Further, in the external leg 8 applied to the compressor according to this example, as illustrated in FIG. 2 and FIG. 3, side edges 8D connected between the respective leg portions 8B are each formed in a curved shape that is recessed toward the housing 3. That is, in the external leg 8, the curved side edges 8D between the respective leg portions 8B are connected to one another. Therefore, as compared to a configuration where straight lined side edges 8D between respective leg portions 8B are connected to one another, by decrease in area that is flat shaped, acceleration, at which the vibration is transmitted in the vertical direction, is able to be kept low. As a result, noise due to the vibration is able to be reduced even more. Since the external leg 8 according to this embodiment has bent portions 8Da formed by folding of the side edges 8D between the respective leg portions 8B downward, the rigidity is able to be increased, and reduction in the rigidity due to the decrease in the flat shaped area resulting from the curved formation is able to be prevented.

Reference Signs List

1 COMPRESSOR
3 HOUSING
3a HOUSING BODY
3b BOTTOM PORTION
3c LID PORTION
7 COMPRESSION MECHANISM
8 EXTERNAL LEG (EXTERNAL LEG FOR COMPRESSOR)
8A FIXING PORTION
8Aa FIXING HOLE
8B LEG PORTION
8Ba ATTACHMENT HOLE
8C REINFORCEMENT PORTION
8Ca PLANE
8Cb INNER SURFACE
8Cc OUTER SURFACE
8D SIDE EDGE
8Da BENT PORTION

Claims

An external leg (8) for a compressor (1), the external leg (8) being configured to be fixed to a bottom end portion of a housing (3) outside the housing (3), the housing (3) accommodating therein a compression mechanism (7), the external leg (8) being formed of a metal plate, the external leg (8) comprising:
a fixing portion (8A) that is configured to be fixed to the bottom end portion of the housing (3) and that is plate shaped;

leg portions (8B) that are formed of plate piece members extending out in plural lateral directions continuously from the fixing portion (8A) and that have attachment holes (8Ba) formed at extended ends of the leg portions (8B); and

reinforcement portions (8C) that comprise: recessed portions having planes (8Ca) on lower end portions of the recessed portions, the lower end portions being recessed between the fixing portion (8A) and the attachment holes (8Ba) in the leg portions (8B); or protruding portions having planes (8Ca) on upper end portions of the protruding portions, the upper end portions protruding between the fixing portion (8A) and the attachment holes (8Ba) in the leg portions (8B).
The external leg according to claim 1, wherein each reinforcement portion (8C) has: an inner surface formed along an outer peripheral shape of the bottom end portion of the housing (3); and an outer surface extending toward the attachment hole (8Ba) respectively from ends of the inner surface.
The external leg according to claim 1 or 2, wherein side edges (8D) connected between the respective leg portions (8B) are each formed in a curved shape recessed toward the housing (3).
A compressor (1), comprising:
a compression mechanism (7);

a housing (3) that accommodates therein the compression mechanism (7); and

an external leg (8) according to any one of claims 1 to 3.
The compressor of claim 4, wherein the external leg (8) is fixed to a bottom end portion of the housing (3) outside the housing (3).
The compressor according to claim 4 or 5, wherein the bottom end portion of the housing (3) is closed with the compression mechanism (7) being accommodated in the housing (3), and the fixing portion (8A) has a fixing hole into which the bottom end portion of the housing (3) is fitted.
The compressor according to claim 4, wherein the bottom end portion of the housing (3) is open with the compression mechanism (7) being accommodated in the housing (3), and the fixing portion (8A) also serves as a bottom plate closing the bottom end portion of the housing (3).