JP2009103134A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To reduce weight and cost when reducing noise by increasing the rigidity of a casing (10). <P>SOLUTION: A casing (10) is formed of a cylindrical body part (11) and upper and lower side end plates (12) and (13) disposed on the upper and lower sides of the body part (11). A projected part (11b) and a recessed part (11c) are formed on the outer surface upper end side of the body part (11), a recessed part (11d) and a projected part (11e) are formed on the inner surface thereof correspondingly with the projected part (11b) and the recessed part (11c), and a waveform area (11a) is formed of these projected parts (11b) and (11e) and the recessed parts (11c) and (11d). The stator (31) of an electric motor (30) is shrink-fitted to the inner surface of the body part (11), and the cylinder (21) of a compression mechanism (20) is fixed to the lower side thereof by welding. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor, and particularly belongs to the technical field of a structure in which a compression mechanism and an electric motor are housed in a casing.

  Conventionally, as this type of compressor, a compressor in which a rotary compression mechanism and an electric motor that drives the compression mechanism are housed in a hermetic casing is known (for example, see Patent Documents 1 and 2). In the compressors of Patent Documents 1 and 2, a stator of an electric motor is fitted and held on the inner surface of a casing peripheral wall, and a rotor is rotatably disposed inside the stator, and the compression is performed in a central hole of the rotor. A crankshaft for driving the mechanism is integrally provided.

  On the other hand, for example, a cylinder of a rolling piston type compression mechanism is fitted into the inner surface of the casing peripheral wall, and a piston attached to the crankshaft and eccentrically rotated when the electric motor is started is inserted in the cylinder.

  And by energizing the coil provided in the stator of the electric motor, the rotor rotates, the piston of the compression mechanism rotates, and the compression work is performed. During the operation of the compressor, the stator of the electric motor undergoes polygonal deformation vibration due to the attraction force and the repulsive force, and vibration accompanying the compression work of the compression mechanism also occurs. At this time, in the compressors of Patent Documents 1 and 2, since the electric motor and the compression mechanism are fitted on the inner surface of the casing, the electric motor and the compression mechanism serve as an excitation source to directly excite the casing, and noise. Will occur.

  As a noise countermeasure in such a case, there is a case where the casing is covered with a sound absorbing material to prevent noise from leaking outside. However, the general sound-absorbing material used in this case has a low sound-absorbing performance of sound in a low frequency band of about 2000 Hz or less, for example. Therefore, if the natural frequency of the casing is in such a low frequency band, a relatively large noise generated when the casing resonates with the excitation source leaks outside without being absorbed much.

  Therefore, as a noise countermeasure during the operation of the compressor, in the compressor of Patent Document 1, the rigidity is improved so that the casing is less likely to vibrate by fitting a ring-shaped reinforcing member into the inner surface of the casing peripheral wall. Yes. Further, in Patent Document 1, since the natural frequency of the casing moves to a high frequency band due to the rigidity improvement of the casing, when the compressor is covered with a sound absorbing material, it is generated in resonance with the excitation source. Noise is absorbed by the sound-absorbing material, and there is no problem.

Moreover, in the compressor of the said patent document 2, the rigidity of a casing is improved and the noise is made small by making the board | plate material of a casing surrounding wall thicker than an end plate.
Japanese Patent Laid-Open No. 10-318163 (page 3, FIGS. 1 and 2) JP-A-7-269484 (6th page, FIG. 3)

  However, in the compressor of Patent Document 1, since a separate reinforcing member is assembled to the casing, the material of the reinforcing member, the processing man-hours and the assembling man-hours are required, and the cost of the compressor is increased.

  Moreover, in the compressor of the said patent document 2, in order to reduce a noise, the plate | board thickness of a casing surrounding wall must be made quite thick, and the weight of a compressor becomes heavy.

  The present invention has been made in view of such points, and the object of the present invention is to improve the rigidity of the casing to reduce noise during operation, by improving the shape of the casing, This is to reduce the cost and reduce the weight of the compressor.

  In order to achieve the above object, in the present invention, a corrugated region is formed in the casing.

  Specifically, the invention of claim 1 is directed to a compressor in which a compression mechanism (20) and an electric motor (30) for driving the compression mechanism (20) are accommodated in a casing (10).

  The casing (10) peripheral wall is formed in a cylindrical shape, the compression mechanism (20) and the electric motor (30) are held on the inner surface of the casing (10) peripheral wall, and the casing (10) peripheral wall includes the peripheral wall. The concave portions (11c), (11d) and the convex portions (11b), (11e) extending in the circumferential direction are provided with a corrugated region (11a) formed alternately over a predetermined width.

  According to this configuration, the rigidity of the peripheral wall of the casing (10) is improved by providing the corrugated region (11a), and the motor (30) is held by the peripheral wall of the casing (10) having a large rigidity. The deformation vibration of the electric motor (30) can be reduced by the peripheral wall of the casing (10), and even if the deformation vibration is transmitted to the casing (10), the casing (10) does not vibrate greatly and noise is reduced. In addition, even if the vibration of the compression mechanism (20) is transmitted to the casing (10), the casing (10) does not vibrate greatly, and this also reduces the noise during the operation of the compressor (20). Further, since the natural frequency of the casing (10) shifts to a high frequency band due to the improvement of the rigidity of the peripheral wall of the casing (10), when the casing (10) is covered with a sound absorbing material, the casing (10) is connected to the electric motor (30). Even if noise is generated due to resonance with deformation vibration or the like, it is sufficiently absorbed by the sound absorbing material.

  Since noise is thus reduced, it is not necessary to provide a reinforcing member on the peripheral wall of the casing (10) as in the prior art, and the cost can be reduced. Further, it is not necessary to increase the thickness of the peripheral wall of the casing (10), the compressor is lightweight, and sufficient pressure resistance is obtained, so that high-pressure refrigerant can be used.

  In the invention of claim 2, in the invention of claim 1, the corrugated region (11a) is provided on at least one of the upper side and the lower side of the portion where the motor (30) is fitted to the peripheral wall of the casing (10).

  According to this configuration, the portion of the casing (10) where the electric motor (30) is fitted has a relatively high rigidity due to the electric motor (30), while the corrugated region (11a) is provided on at least one of the upper side and the lower side thereof. As a result, the rigidity of the portion other than the portion where the electric motor (30) of the casing (11) is fitted is improved. As a result, the rigidity of the casing (11) in a wide range is increased and noise is further reduced.

  In the invention of claim 3, in the invention of claim 1, the corrugated region (11a) is provided at a location where the electric motor (30) is fitted to the peripheral wall of the casing (10).

  According to this configuration, since the outer surface of the electric motor (30) is held by the inner surface of the highly rigid waveform region (11a), it is possible to effectively reduce the deformation vibration of the electric motor (30), and the noise is further reduced. .

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the corrugated region (11a) is provided in a region wider than a portion where the electric motor (30) is fitted to the peripheral wall of the casing (10).

  According to this structure, the area | region where rigidity of a casing (10) is large covers a wide range, and noise becomes still smaller.

  According to the invention of claim 5, in the invention of claim 3 or 4, the outer surface of the electric motor (30) is held by the convex portion (11e) protruding to the inside of the peripheral wall of the casing (10) of the corrugated region (11a).

  According to this configuration, since a plurality of locations on the outer surface of the electric motor (30) are held, the electric motor (30) is firmly held.

  As described above, according to the compressor of the first aspect of the present invention, the compression mechanism and the electric motor are held by the inner surface of the casing peripheral wall, and the corrugated region is provided on the casing peripheral wall, so that the casing peripheral wall is reinforced as in the past. Even if a member is not provided or the thickness of the casing peripheral wall is not increased, the rigidity of the casing is improved and noise during operation of the compressor can be reduced. As a result, the cost can be reduced, the compressor can be reduced in weight, and a high-pressure refrigerant can be used.

  According to the second aspect of the present invention, since the corrugated region is provided on at least one of the upper side and the lower side of the portion where the electric motor is fitted to the casing peripheral wall, the rigidity of the wide range of the casing is improved and the noise can be further reduced. it can.

  According to the third aspect of the present invention, since the corrugated region is provided at a position where the electric motor is fitted to the casing peripheral wall, the outer surface of the motor is held by the inner surface of the corrugated region having high rigidity to effectively reduce the deformation vibration of the electric motor. The noise can be further reduced.

  According to the fourth aspect of the present invention, since the corrugated region is provided in a region wider than the portion where the motor is fitted to the casing peripheral wall, the region where the rigidity of the casing is large can be further reduced over a wide range.

  According to the fifth aspect of the present invention, since the outer surface of the electric motor is held by the convex portion protruding to the inside of the peripheral wall of the corrugated region, the electric motor can be held firmly.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows an embodiment in which the present invention is applied to a rotary (rolling piston type) compressor (1). The compressor (1) performs a refrigerant compression stroke in a refrigeration cycle such as an air conditioner.

  The casing (10) of the compressor (1) is a hermetically sealed type, and the casing (10) includes a cylindrical body (11) that forms a peripheral wall of the casing (10) and extends in the vertical direction. . The upper end plate (12) is fitted inside the upper end portion of the trunk portion (11), and the lower end plate (13) is fitted inside the lower end portion, and the trunk portion (11), the upper end plate (12), and the lower end portion are fitted. A casing (10) is constituted by the side end plate (13). The upper end plate (12) and the lower end plate (13) are integrated by welding the entire periphery to the body portion (11), and a compression mechanism (20) is disposed on the lower end side inside the casing (10). On the other hand, an electric motor (30) is disposed above the compression mechanism (20). Although not shown, the casing (10) is installed in a state of being covered with a sound absorbing material.

  On the upper end side of the outer surface of the trunk portion (11), a convex portion (11b) protruding in an arc surface shape outwardly of the casing (10) and extending over the entire circumference of the trunk portion (11), and inward of the casing (10) Concave portions (11c) extending over the entire circumference of the hollow body portion (11) in a circular arc shape are alternately formed over a predetermined width in the center line direction of the casing (10). Further, the inner surface of the body (11) is formed with a concave portion (11d) that is recessed in a circular arc shape outwardly from the casing (10) at a location corresponding to the convex portion (11b) of the outer surface, and the concave portion of the outer surface. A convex portion (11e) is formed at a location corresponding to (11c) so as to project in an arcuate surface toward the inside of the casing (10). The trunk portion (11) has a convex portion (11b) and a concave portion (11c) on the outer surface, and a concave portion (11d) and a convex portion (11e) on the inner surface, so that the cross-sectional shape in the center line direction is corrugated on the trunk portion (11). A corrugated area (11a) is formed, and the rigidity of the entire casing (10) is improved by the corrugated area (11a).

  Further, a refrigerant suction pipe (14) penetrating through the trunk part (11) is disposed on the lower end side of the trunk part (11). The upstream end of the refrigerant suction pipe (14) communicates with the interior of the accumulator (50) disposed adjacent to the body (11).

  As an example of manufacturing the body (11) of the casing (10), although not shown, first, a plate material is pressed to form a corrugated region (11a), and then the plate material is formed around the periphery of the body (11). Cut to length. The cut plate material is bent into a cylindrical shape corresponding to the shape of the body portion (11), and then the seamed portion is welded, and a forming die is inserted inside thereof to form the inner diameter to a specified dimension.

  On the other hand, the upper end plate (12) of the casing (10) has a refrigerant discharge pipe (15) vertically passing through the end plate (12), a terminal (16) and a terminal cover (17) for supplying power to the electric motor (30). ). The outer part of the casing (10) of the terminal (16) is connected to an external power source (not shown).

  The compression mechanism (20) includes a cylindrical cylinder (21) in which a cylinder chamber (25) is formed, and the center line of the cylinder (21) is substantially the same as the center line of the body (11). It arrange | positions so that it may correspond. The cylinder (21) is formed with a suction passage (27) whose downstream end communicates with the cylinder chamber (25), and the downstream end of the refrigerant suction pipe (14) is located at the upstream end of the suction passage (27). It is connected. A cylindrical rotating piston (26) that rotates eccentrically with respect to the center line of the cylinder (21) is inserted in the cylinder chamber (25).

  A front head (23) for closing the upper end opening of the cylinder (21) is arranged at the upper part of the cylinder (21), and a rear head (24) for closing the lower end opening of the cylinder (21) is arranged at the lower part, The front head (23) and the rear head (24) are fastened and integrated with the cylinder (21) using bolts or the like. The outer peripheral side of the cylinder (21) is formed so as to be fitted to the inner surface of the body (11), and the outer periphery of the cylinder (21) is welded to the body (11) to compress the compression mechanism ( 20) is fixed to the body (11).

  The front head (23) is formed with a discharge passage (not shown) for discharging the compressed refrigerant in the cylinder chamber (25) into the casing (10) so as to extend vertically. An opening is formed in the upper surface of the head (23), and an opening / closing valve (not shown) is disposed in the opening. A muffler (28) is attached to the front head (23) so as to cover the upper part of the downstream end opening of the discharge passage.

  On the other hand, the electric motor (30) is configured to be capable of variable speed control by an inverter circuit of the external power source. The electric motor (30) includes a cylindrical stator (31) fixed to the lower side of the corrugated region (11a) on the inner surface of the body (11), and a rotor rotatably disposed in the stator (31) ( 32). The stator (31) is fixed by shrink fitting with the outer surface thereof being in close contact with the inner surface of the body (11), and the rotor (32) has a central hole constituting a part of the rotor (32). A crankshaft (33) is inserted and fixed. The crankshaft (33) is disposed substantially concentrically with the center line of the trunk portion (11), while the eccentric portion (33a) formed on the lower end side faces the cylinder chamber (25). ing. The upper side and the lower side of the eccentric part (33a) of the crankshaft (33) are respectively supported by the front head (23) and the rear head (24) of the compression mechanism (20). The center part of the eccentric part (33a) of the crankshaft (33) is eccentric with respect to the center line of the crankshaft (33), and the rotary piston (26) is fitted on the eccentric part (33a). Has been. A disc-like oil separator (63) is disposed at the upper end of the rotor (32).

  On the inner peripheral side of the stator (31), a plurality of pairs of coils (48) that are paired in the radial direction are provided, and these coils (48) are not shown, but inside the casing (10) of the terminal (16). A voltage having a different phase is applied to each set of coils (48) by the external power source to generate an electromagnetic force. On the other hand, a core (51) is integrally provided on the outer peripheral portion of the rotor (32), and the core (51) constitutes a part of the rotor (32). In the rotor (32), permanent magnets that are paired in the radial direction are embedded, and the core (51) is magnetized. Then, by applying a three-phase alternating current to each set of coils (48) of the stator (31), the core (51) of the rotor (32) is attracted to the coil (48) and the coil (48 A repulsive force away from the cylinder) is periodically generated, which causes the rotor (32) to rotate.

  In the compressor (1) configured as described above, when a current controlled to a predetermined frequency by the inverter circuit of the external power source flows to the electric motor (30) via the terminal (16), the rotor (32) rotates. To do. When the rotor (32) rotates, the stator (31) has a polygonal shape due to the attractive and repulsive forces generated between the coils (48) of the stator (31) and the core (51) of the rotor (32). Deformation vibration occurs.

  The refrigerant is sucked into the cylinder chamber (25) from the suction passage (27) and compressed by the eccentric rotation of the rotary piston (26) of the compression mechanism (20) by the electric motor (30), and then the casing is discharged from the discharge passage. (10) is discharged into the chamber, and vibrations accompanying this compression work occur. The refrigerant discharged from the compression mechanism (20) flows through the gap between the stator (31) and the rotor (32) to the upper part in the casing (10) and flows out from the refrigerant discharge pipe (15).

-Effect of the embodiment-
During the operation of the compressor (1), deformation vibration of the stator (31), vibration of the compression mechanism (30) due to compression work, and the like occur, but according to the present embodiment, the trunk portion (11 of the casing (10) ) To improve the rigidity by forming a corrugated region (11a), and the stator (31) of the electric motor (30) is held by the inner surface of the body (11), so the rotor (32) of the electric motor (30) ), The polygonal deformation vibration generated in the stator (31) can be reduced by suppressing the casing (10). Further, even when the casing (10) is vibrated due to the deformation vibration of the stator (31) and the vibration caused by the compression work, the casing (10) does not vibrate greatly. The noise of 1) can be reduced.

  Although not shown, in recent years, a combination of an IPM (Interior Permanent Magnet) rotor in which a permanent magnet is embedded in a core is often used in a concentrated winding stator due to a demand for higher efficiency. Since the IPM rotor has a core with high magnetic permeability on the rotor surface and faces the stator core with a slight gap, the polygonal deformation vibration is remarkable. In addition, since the excitation force concentrated on one pole tooth is increased by using concentrated winding, the present invention is particularly suitable for a combination of an IPM rotor in which a permanent magnet is embedded in a core in a concentrated winding stator. is there.

  Further, the portion of the body (11) where the electric motor (30) is fitted is relatively high in rigidity due to the stator (31) of the electric motor (30), and more than the electric motor (30) of the body (11). Since the corrugated region (11a) is provided in the upper region and the rigidity of the region is improved, the rigidity of a wide range of the body (11a) is increased, and noise can be reduced more effectively. The waveform region (11a) may be provided in a region below the electric motor (30) of the trunk portion (11).

  Moreover, the natural frequency of the casing (10) shifts to a high frequency band of, for example, 2 kHz or more by improving the rigidity of the body (11). As a result, even if the casing (10) resonates with the vibration of the electric motor (30) and a relatively large noise is generated, the noise is in a frequency band in which the sound absorbing material works effectively. Sufficient sound absorption.

  Thus, in the present embodiment, when the noise of the compressor (1) during operation is reduced by improving the rigidity of the casing (10), it is not necessary to provide a reinforcing member as in the prior art, and accordingly The cost can be reduced, and it is not necessary to increase the plate thickness of the body (11), so that the compressor (1) can be lightened.

  Furthermore, since the pressure resistance is improved without increasing the plate thickness by forming the corrugated region (11a) in the body portion (11), the compressor (1) corresponding to the high-pressure refrigerant can be configured to be lightweight.

  Note that, as in the modification shown in FIG. 2, the corrugated region (11a) of the body (11) is located near the upper end of the body (11) from the portion facing the lower end of the outer surface of the stator (31) of the electric motor (30). May be provided continuously. In this case, the convex portion (11e) of the corrugated region (11a) facing the outer surface of the stator (31) is formed so as to contact the outer surface of the stator (31), and the trunk portion of the stator (31) is formed by the convex portion (11e). (11) Since the plurality of parts separated in the center line direction are held, the stator (31) can be held firmly.

  In this modification, the outer surface of the stator (31) is held by the highly rigid portion of the body (11), so that the deformation vibration of the stator (31) can be effectively reduced, and in addition, the casing (10 ) Over a wide range, the noise of the compressor (1) during operation can be further reduced.

  Further, in the present embodiment, when manufacturing the body portion (11), the plate material is pressed to form the corrugated region (11a), and then the plate material is cut into the circumferential length of the body portion (11). After the cut plate material is bent into a cylindrical shape corresponding to the shape of the body (11), the seam is welded, and a molding die is inserted inside to form the inner diameter to a specified size. However, as another processing method, there is a method of inserting a forming die after forming a plate material into a cylindrical shape. In addition, for example, a flat plate material is wound around a mold and formed into a cylindrical shape, and then the seam is welded. Thereafter, the mold is placed inside and outside, and the corrugated region (11a) is formed by tube expansion processing. May be formed. Further, for the production of the barrel (11), a cylindrical pipe is formed by drawing, and after cutting the pipe into the length in the center line direction of the barrel (11), the pipe is expanded as described above. The waveform area (11a) may be formed.

  Furthermore, the cross-sectional shape of the waveform region (11a) may be a sine wave shape, a triangular wave shape, or the like, and may be formed so that the wave pitches are unequal.

  Furthermore, in the present embodiment, the corrugated region (10) may be formed in a spiral shape. In this case, the refrigerant discharged from the compression mechanism (20) smoothly flows upward through the inner surface of the corrugated region (10). It becomes like this.

    As described above, the present invention is useful for a compressor.

It is a longitudinal section showing a schematic structure of a compressor concerning an embodiment of the present invention. It is FIG. 1 equivalent view which concerns on a modification.

Explanation of symbols

(10) Casing
(11a) Wavy part
(11e) Convex part (holding surface part)
(20) Compression mechanism
(30) Electric motor

Claims (5)

The compression mechanism (20) and the electric motor (30) that drives the compression mechanism (20) are the compressors housed in the casing (10),
The casing (10) peripheral wall is formed in a cylindrical shape, the compression mechanism (20) and the electric motor (30) are held on the inner surface of the casing (10) peripheral wall,
On the peripheral wall of the casing (10), concave portions (11c), (11d) and convex portions (11b), (11e) extending in the circumferential direction of the peripheral wall are alternately formed over a predetermined width (11a ) Is provided. In claim 1,
The compressor is characterized in that the corrugated region (11a) is provided on at least one of the upper side and the lower side of the portion where the electric motor (30) is fitted to the peripheral wall of the casing (10). In claim 1,
The compressor is characterized in that the corrugated region (11a) is provided at a position where the electric motor (30) is fitted to the peripheral wall of the casing (10). In claim 3,
The compressor is characterized in that the corrugated area (11a) is provided in an area wider than a position where the electric motor (30) is fitted to the peripheral wall of the casing (10). In claim 3 or 4,
The compressor characterized in that the outer surface of the electric motor (30) is held by a convex portion (11e) protruding inward of the peripheral wall of the casing (10) of the corrugated region (11a).

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