JP2013164039A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor used for an air conditioner or others more effectively reducing noise when discharging.SOLUTION: A groove 60 partially overlapping a distal end part of a lap wall 22 of an orbiting scroll 20 when a compressing space 50 formed between a fixed scroll 30 and the orbiting scroll 20 is located in a position communicating with a discharge hole 37 is formed in the end plate 31 of the fixed scroll 30. The groove 60 is formed on the end plate 31 continuously in a peripheral direction such that an area where the lap wall 22 covers the groove 60 gradually changes when the lap groove 22 turns and moves by the orbiting motion of the orbiting scroll 20 to the end plate 31 of the fixed scroll 30. Consequently, the length L in a direction along the surface of the end plate 31 changes in a cylindrical space 70 surrounded by the distal end part of the lap wall 22 of the fixed scroll 20 and the groove 60 when the compressing space 50 is in communication with the discharge hole 37 and refrigerant gas is discharged.

Description

  The present invention relates to a scroll compressor used for an air conditioner or the like.

  A scroll compressor used for an air conditioner or the like includes a fixed scroll and a turning scroll. Each of the fixed scroll and the orbiting scroll is formed by integrally forming a spiral wrap wall on one surface side of a disk-shaped end plate. The fixed scroll and the orbiting scroll are made to face each other with the lap wall meshed, and the orbiting scroll is caused to make a revolving orbit with respect to the fixed scroll. And the fluid in compression space is compressed by reducing the volume, moving the compression space formed between both lap walls from the outer peripheral side to the inner peripheral side.

  In such a scroll compressor, it is desired to suppress noise during operation. Therefore, in order to reduce noise caused by pulsation when the refrigerant gas is discharged from the compression space, a bottomed hole is formed on the surface of the end plate of the fixed scroll (for example, see Patent Document 1). ). In this technique, the depth of the bottomed hole is set to a value corresponding to the wavelength of the noise peak frequency, so that the generated noise is effectively reduced.

JP 2011-47383 A

By the way, according to the study by the present inventors, when a refrigerant such as R410 is used, noise of a frequency component such as 4 to 5 kHz of discharge pulsation is generated. This is an acoustic eigenvalue determined by the volume of the space communicating with the compression space when the discharge hole opened in the compression space is opened during discharge.
Thus, even if it is intended to reduce the noise of a frequency component having a width (band) such as 4 to 5 kHz, in the conventional technique, as described above, the depth dimension of the bottomed hole is the noise peak frequency. Since this is a value corresponding to the wavelength, only noise of a specific frequency (noise peak frequency) can be reduced.

On the other hand, in the technique described in Patent Document 1, it is described that noises having a plurality of frequencies are reduced by forming a plurality of bottomed holes having different depth dimensions. However, the bottomed hole needs to be formed in a compression space communicating with the discharge hole at the time of discharge, and the bottomed hole installation area is limited. Therefore, it must be said that it is difficult to effectively reduce noise having a wide frequency. Also in this case, the noise can be reduced by noise having a frequency corresponding to the depth of each bottomed hole, and can be reduced by intermittent frequency noise.
The present invention has been made based on such a technical problem, and an object of the present invention is to provide a scroll compressor that can more effectively reduce noise during discharge.

The scroll compressor of the present invention made for this purpose includes a main shaft rotatably supported in a housing forming an outer shell, and is rotatably connected to a position offset with respect to the center of the main shaft. A orbiting scroll in which a spiral orbiting scroll side wrap wall is formed on a plate-like orbiting side end plate, and a spiral fixing that is fixed to a housing and is opposed to the orbiting scroll side wrap wall on a disk-like stationary side end plate A scroll-side wrap wall is formed and faces the orbiting scroll to form a compression space for compressing refrigerant surrounded by the orbiting side end plate, the orbiting scroll side wrap wall, the fixed side end plate, and the fixed scroll side wrap wall. The fixed scroll, the discharge hole formed in the center of the fixed scroll end plate, and the surface of the fixed scroll end plate facing the orbiting scroll side wrap wall. A groove formed continuously in a direction along the surface and formed at a position facing the front end surface of the scroll-side wrap wall when the compression space communicates with the discharge hole by the orbiting operation of the orbiting scroll. The cylindrical space surrounded by the groove and the front end surface of the scroll side wrap wall is variable in length in the direction along the surface of the fixed side end plate.
As described above, the length of the cylindrical space surrounded by the groove and the front end surface of the scroll side wrap wall is variable in the direction along the surface of the fixed side end plate in accordance with the orbiting operation of the orbiting scroll. Thus, it is possible to absorb noise in a wide frequency band.

  According to the present invention, the length in the direction along the surface of the fixed-side end plate of the cylindrical space surrounded by the groove and the front end surface of the scroll-side wrap wall can be varied to further reduce noise during discharge. It can be effectively reduced.

It is a figure which shows the whole structure of the scroll compressor in this Embodiment. It is a figure which shows the meshing state of a fixed scroll and a turning scroll, Comprising: It is sectional drawing in the surface along a main axis | shaft. It is a figure which shows the meshing state of a fixed scroll and a turning scroll, Comprising: It is principal part sectional drawing which shows the groove | channel formed in the end plate of a fixed scroll. It is a figure which shows the state which the turning scroll shown in FIG. 3 further rotated. It is a figure which shows the state which the turning scroll shown in FIG. 4 further rotated. It is a figure which shows the state which the turning scroll shown in FIG. 5 further rotated.

Hereinafter, the present invention will be described in detail based on embodiments shown in the accompanying drawings.
FIG. 1 is a cross-sectional view for explaining the configuration of the compressor in the present embodiment.
As shown in FIG. 1, the compressor 10 is a vertical scroll type, and includes a main shaft 12, a turning scroll 20 that rotates together with the main shaft 12, a fixed scroll 30 fixed to the housing 11, and a housing 11. Is provided.
In such a compressor 10, the refrigerant is introduced into the housing 11 from the refrigerant introduction port P <b> 1 formed on one end side of the housing 11, and the refrigerant is compressed in the compression space formed between the orbiting scroll 20 and the fixed scroll 30. Is compressed. The compressed refrigerant is discharged from a refrigerant discharge port P <b> 2 formed on the other end side of the housing 11.

In the orbiting scroll 20, a wrap wall (orbiting scroll side wrap wall) 22 having a predetermined height is formed integrally with a disc-shaped end plate (orbiting side end plate) 21.
On the other hand, the fixed scroll 30 has a spiral wrap wall (fixed scroll side wrap wall) 32 that meshes with an end plate (fixed side end plate) 31 facing the orbiting scroll 20 so as to oppose the wrap wall 22 of the orbiting scroll 20. Is formed.

In this way, the orbiting scroll 20 and the fixed scroll 30 combine the wrap wall 22 and the wrap wall 32 with each other. Thereby, a compression space 50 is formed between the orbiting scroll 20 and the fixed scroll 30.
Thereby, the refrigerant introduced into the compression space 50 from the outer peripheral side of the orbiting scroll 20 and the fixed scroll 30 is sequentially sent from the outer peripheral side to the inner peripheral side and compressed by the revolution of the orbiting scroll 20 with respect to the fixed scroll 30. The refrigerant compressed in the compression space 50 includes a discharge hole 37 formed in the fixed scroll 30, a reed valve 38 provided in the discharge hole 37, and a lead provided in an upper cover 39 provided so as to cover the fixed scroll 30. The refrigerant is discharged from a refrigerant discharge port P2 formed on the other end side of the housing 11 through the valve 40.

  Both ends of the main shaft 12 are rotatably supported by the housing 11 via bearings 13 and 14. The main shaft 12 is rotationally driven by a motor 17 including a stator 15 fixed to the inner surface of the housing 11 and a rotor 16 fixed to the outer peripheral surface of the main shaft 12 and facing the stator 15. The main shaft 12 is driven to rotate by one end of the main shaft 12 projecting outside through the housing 11 and connected to one end of the main shaft 12 by a driving source (not shown) such as an engine or a motor provided outside. You can also

On the other end portion of the main shaft 12, a boss 18 is formed so as to protrude from the central axis of the main shaft 12 by a predetermined amount. A recess 23 that accommodates the boss 18 is formed on the main shaft 12 side of the orbiting scroll 20. The boss 18 is inserted into the recess 23 via a drive bush (bearing) 24, whereby the orbiting scroll 20 is rotatably held by the boss 18. Thereby, the orbiting scroll 20 is provided eccentrically by a predetermined dimension with respect to the center of the main shaft 12, and when the main shaft 12 rotates around its axis, the orbiting scroll 20 is eccentric with respect to the center of the main shaft 12. Performs rotation (revolution) with the dimensions as the radius. An Oldham ring (not shown) is interposed between the orbiting scroll 20 and the main shaft 12 so that the orbiting scroll 20 does not rotate while revolving.
Further, the main shaft 12 is formed with a lubricating oil passage 12 a for supplying the lubricating oil sucked up from the oil reservoir at the bottom of the housing 11 from the upper end portion of the main shaft 12 to the drive bush 24 between the main shaft 12 and the recess 23. Has been.

Here, in order to increase the degree to which the cross-sectional area of the compression space 50 formed between the orbiting scroll 20 and the fixed scroll 30 gradually decreases from the outer peripheral side toward the inner peripheral side, On both sides, the wrap height of the orbiting scroll 20 and the fixed scroll 30 can be gradually reduced from the outer peripheral side toward the inner peripheral side.
As shown in FIG. 2, the end plate 21 of the orbiting scroll 20 is formed so that the thickness of the inner peripheral portion 21B is larger than the thickness of the outer peripheral portion 21A. On the other hand, the end plate 31 of the fixed scroll 30 is formed so that the thickness of the inner peripheral portion 31B is larger than the thickness of the outer peripheral portion 31A. Accordingly, the height of the wrap wall 22 of the orbiting scroll 20 and the wrap wall 32 of the fixed scroll 30 is formed so as to be gradually reduced from the outer peripheral side to the inner peripheral side. In this manner, the wrap height of the orbiting scroll 20 and the fixed scroll 30 is decreased stepwise (stepwise) from the outer peripheral side to the inner peripheral side of the fixed scroll 30.

  Here, in the wrap wall 22 of the orbiting scroll 20 and the wrap wall 32 of the fixed scroll 30, the end plate 31 of the fixed scroll 30 and the tip portion opposed to the end plate 21 of the orbiting scroll 20 are made of ceramic in order to enhance the sealing performance. Chip seals 28 and 38 made of a system material or the like are provided.

Now, as shown in FIG. 3, the end plate 31 of the fixed scroll 30 has a compression space 50 formed between the fixed scroll 30 and the orbiting scroll 20 and a discharge hole formed in the center of the end plate 31. A groove 60 is formed at least partially overlapping with the tip of the lap wall 22 of the orbiting scroll 20 when the position communicates with the orbiting scroll 20.
The groove 60 is formed on the end plate 31 so that the area of the wrap wall 22 covering the groove 60 gradually changes when the wrap wall 22 is turned by the turning operation of the turning scroll 20 with respect to the end plate 31 of the fixed scroll 30. , Continuously formed in the circumferential direction. As shown in FIG. 3, a plurality of grooves 60 may be formed, or only one groove 60 may be formed. Moreover, although the groove | channel 60 was formed in circular arc shape, it is good also as other shapes, such as linear form.

According to such a configuration, as shown in FIGS. 4 to 7, when the refrigerant space is discharged while the compression space 50 communicates with the discharge hole 37, the tip end portion and the groove of the wrap wall 22 of the orbiting scroll 20 are provided. A cylindrical space 70 surrounded by 60 is formed. And as the area where the wrap wall 22 covers the groove 60 changes, the length L of the cylindrical space 70 in the direction along the surface of the end plate 31 changes.
As a result, the wavelength of noise that can be silenced in the cylindrical space 70 changes with the change in the length L of the cylindrical space 70 when being discharged from the compression space 50. ) Can be reduced.
Moreover, since the groove 60 is formed so as to be continuous along the surface of the end plate 31, it is possible to cope with noise reduction in various frequency bands by adjusting the length thereof. On the other hand, in the case of a bottomed hole in a direction orthogonal to the end plate 31, there is an upper limit on the length depending on the thickness of the end plate 31.

  As described above, when the compression space 50 communicates with the discharge hole 37 by the groove 60 formed to be continuous along the surface of the end plate 31 and the wrap wall 22 of the orbiting scroll 20 facing the groove 60. The length of the cylindrical space 70 is variable. Accordingly, it is possible to effectively reduce the noise in the frequency band having a width without forming a plurality of grooves 60 according to the noise frequency to be reduced.

In the above embodiment, the overall configuration of the compressor 10 has been exemplified, but each unit may have any configuration as long as it is within the scope of the present invention. For example, the orbiting scroll 20 and the fixed scroll 30 have a configuration in which the thickness of the end plates 21 and 31 is different between the outer peripheral portion and the inner peripheral portion, but even if the thickness of the end plates 21 and 31 is constant. Of course.
Moreover, although the groove | channel 60 was made into the curved circular arc shape, this may be made into linear form, and it is good also as another shape.
Although it is possible to form the groove 60 on the orbiting scroll 20 side, in that case, the lubricating oil contained in the refrigerant gas may accumulate in the groove 60, and the required function may not be achieved.

Further, when the hole 80 having the same function as the groove 60 is formed in the upper cover 39 of the compressor 10, and the compression space 50 communicates with the discharge hole 37, the external space communicates with the compression space 50 via the discharge hole 37. The volume of can also be increased. Further, the hole 80 opens toward the discharge hole 37.
In addition to this, as long as it does not depart from the gist of the present invention, the configuration described in the above embodiment can be selected or changed to another configuration as appropriate.

DESCRIPTION OF SYMBOLS 10 Compressor 11 Housing 12 Main axis | shaft 17 Motor 20 Orbiting scroll 21 End plate (revolving side end plate)
21A outer peripheral part 21B inner peripheral part 22 lap wall (orbiting scroll side wrap wall)
30 Fixed scroll 31 End plate (fixed side end plate)
31A Outer peripheral part 31B Inner peripheral part 32 Wrap wall (fixed scroll side wrap wall)
37 discharge hole 39 upper cover 50 compression space 60 groove 70 cylindrical space 80 hole

Claims (1)

A main shaft rotatably supported in a housing forming an outer shell;
A orbiting scroll that is rotatably coupled to a position that is offset with respect to the center of the main shaft, and in which a spiral orbiting scroll side wrap wall is formed on a disc-shaped orbiting side end plate;
A spiral fixed scroll side wrap wall that is fixed to the housing and is opposed to the orbiting scroll side wrap wall is formed on a disk-like fixed side end plate, and is opposed to the orbiting scroll, thereby the orbiting side end. A fixed scroll forming a compression space surrounded by the plate, the orbiting scroll side wrap wall, the fixed side end plate, the fixed scroll side wrap wall, and compressing refrigerant;
A discharge hole formed in a central portion of the fixed-side end plate of the fixed scroll;
The fixed-side end plate is formed continuously on a surface facing the orbiting scroll side wrap wall in a direction along the surface, and the compression space communicates with the discharge hole by the orbiting operation of the orbiting scroll. A groove formed at a position facing the front end surface of the scroll side wrap wall when,
With the orbiting operation of the orbiting scroll, the length of the cylindrical space surrounded by the groove and the front end surface of the scroll side wrap wall is variable along the surface of the fixed side end plate. A featured scroll compressor.

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