JP6948112B2 - Compressor - Google Patents

Description

The present invention relates to a compressor.

As a compressor, for example, a scroll compressor that pumps a working fluid such as a refrigerant by using the rotary motion of a scroll is known. In the scroll compressor, the refrigerant compressed by the scroll is periodically discharged into the discharge space corresponding to the rotation cycle of the scroll (see, for example, Patent Document 1). The discharge space is a space surrounded by the housing and cover of the compressor, and the compressed refrigerant is discharged to another system via the discharge pipe provided in the cover.

Japanese Unexamined Patent Publication No. 2001-336484

By the way, pressure pulsation occurs when the refrigerant is periodically discharged into the discharge space from the discharge port of the scroll. Resonance may occur when this pressure pulsation matches the natural frequency of the discharge space. In a conventional compressor, noise may be generated by vibrating the cover due to this resonance.

An object of the present invention is to provide a compressor capable of reducing noise caused by resonance in a cover in a compressor that periodically compresses a fluid and discharges it into a discharge space.

According to the first aspect of the invention, the compressor includes a rotating shaft that is rotationally driven around an axis extending in the vertical direction, and a compressor main body that periodically compresses and discharges a fluid by using the rotation of the rotating shaft. A cover body that forms a discharge space into which the fluid discharged from the compressor body is introduced, and a cover body that is provided only on the surface of the cover body, extends along the surface, and is formed at equal intervals. A cover having a plurality of reinforcing portions, an electric motor for rotationally driving the rotating shaft around an axis, a housing having a cylindrical shape along the axial line, and accommodating the electric motor, the rotating shaft, and the compressor main body. The cover is an upper cover that closes the upper end of the housing, the housing has a cylindrical shape, and the cover body has a cylindrical cylindrical portion centered on the axis and an upper portion of the cylindrical portion. It has a dome portion that has a curved shape to close and is smoothly connected to the cylindrical portion, and the reinforcing portion radiates from the center of the dome portion, which is the center of the cover body, to the lower end of the cylindrical portion. Extends to.

According to such a configuration, by forming the reinforcing portion on the cover, it is possible to suppress the vibration of the cover generated by the resonance generated corresponding to the fluid discharged periodically and the discharge space.

In the compressor, the reinforcing portion may extend in the circumferential direction with respect to the center of the cover body.

According to the present invention, by forming the reinforcing portion on the cover, it is possible to suppress the vibration of the cover generated by the resonance generated corresponding to the fluid discharged periodically and the discharge space.

It is sectional drawing of the scroll compressor of the 1st Embodiment of this invention. It is a perspective view of the upper cover of the scroll compressor of the 1st Embodiment of this invention. It is a schematic diagram which shows the resonance mode of the discharge chamber of the scroll compressor of the 1st Embodiment of this invention. It is a perspective view of the upper cover of the 1st modified example scroll compressor of 1st Embodiment of this invention. 2 is a perspective view of an upper cover of a scroll compressor according to a second modification of the first embodiment of the present invention. It is a perspective view of the upper cover of the scroll compressor of the 2nd Embodiment of this invention.

[First Embodiment]
Hereinafter, the compressor of the first embodiment of the present invention will be described in detail with reference to the drawings. In the compressor of the present embodiment, the swirling scroll revolves around, and as the compression chamber formed between the scroll and the fixed scroll moves toward the center, the volume of the compression chamber becomes smaller to perform the compression action. It is a scroll compressor. The scroll compressor of this embodiment is used in a refrigeration cycle, and the working fluid is a refrigerant.

As shown in FIG. 1, the scroll compressor 1 includes an electric motor 3, a rotating shaft 2 that is rotationally driven by the electric motor 3 around the axis O1, and a compressor main body that compresses and discharges a refrigerant by using the rotation of the rotating shaft 2. 4, the housing 5 that houses the rotating shaft 2, the motor 3, and the compressor body 4, the upper cover 6 that closes one end of the axial one-side D1 of the housing 5, and the lower cover 7 that closes the axial other D2 of the housing 5. And have.
In the following description, the direction in which the axis O1 of the rotating shaft 2 extends is referred to as the axis direction D. Further, the direction orthogonal to the axis O1 is called the radial direction, the side away from the axis O1 in the radial direction is called the radial outside, and the side approaching the axis O1 in the radial direction is called the radial inside. Further, in the axial direction D, the upper part of FIG. 1 is referred to as one side D1 in the axial direction, and the lower part of FIG. 1 is referred to as the other side D2 in the axial direction.

The compressor main body 4 compresses the refrigerant by the rotational energy of the rotating shaft 2 and discharges it to the outside in a high pressure state.
The compressor main body 4 has a fixed scroll 17 and a swivel scroll 18. The discharge cover 8 is a substantially disk-shaped member that partitions the space inside the housing 5 in the axial direction D. The discharge chamber 15 (discharge space) is a space formed by the discharge cover 8 and the upper cover 6. The discharge chamber 15 is a space into which the refrigerant discharged from the compressor main body 4 is introduced. At the center of the discharge cover 8, a discharge port 20 for communicating the discharge chamber 15 and the compressed refrigerant, and a discharge valve 21 for preventing the backflow of the refrigerant from the high pressure side are provided.

The discharge chamber 15 of the present embodiment is formed by the upper cover 6 and the discharge cover 8, but is not limited to this. For example, the discharge chamber 15 may be formed from the upper cover 6 and the surface of the fixed scroll 17 facing one side D1 in the axial direction, or may be formed only by the upper cover 6.

The housing 5 is provided with a suction pipe 9 for sucking the refrigerant from the outside. The upper cover 6 is provided with a discharge pipe 10 that discharges the refrigerant that has become a high pressure state in the discharge chamber 15 after being compressed by the compressor main body 4.

The rotating shaft 2 has a columnar shape centered on the axis O1. The rotating shaft 2 is rotatably supported in the housing 5 by a main bearing 11 provided on one side D1 in the axial direction and a sub bearing 13 provided on the other side D2 in the axial direction. A main bearing body 12 is attached between the main bearing 11 and the outer peripheral surface of the rotating shaft 2. A sub-bearing body 14 is attached between the sub-bearing 13 and the outer peripheral surface of the rotating shaft 2.

At the end of D1 on one side of the rotating shaft 2 in the axial direction, an eccentric shaft 16 having a columnar shape centered on an eccentric axis O2 different from the axis O1 is provided at a position offset (eccentric) with respect to the axis O1. ing. The eccentric axis O2 is parallel to the axis O1. The eccentric shaft 16 has a columnar shape protruding from the end of the rotating shaft 2 toward D1 on one side in the axial direction. Therefore, in a state where the rotating shaft 2 is rotating around the axis O1, the eccentric shaft 16 revolves around the axis O1 of the rotating shaft 2.

The fixed scroll 17 is a substantially disk-shaped member fixed inside the housing 5. The swivel scroll 18 faces the fixed scroll 17 from the axial direction D to form a compression chamber C between them.
The fixed scroll 17 has a disk-shaped fixed end plate 25 and a fixed wrap 26 erected in the axial direction D from the surface of the fixed end plate 25 on the other side D2 in the axial direction. The fixed end plate 25 extends along a plane that is approximately orthogonal to the axis O1. The fixed wrap 26 is a wall body formed in a spiral shape when viewed from the axial direction D. The fixed wrap 26 is formed of a plate-shaped member wound around the center of the fixed end plate 25. It is desirable that the fixed wrap 26 is configured to form an involute curve centered on the axis O1 when viewed from the axis direction D.

On the radial outer side of the fixed wrap 26, an outer peripheral wall 27 extending in a cylindrical shape along the outer circumference of the fixed end plate 25 is formed. An annular flange portion 28 extending outward in the radial direction is provided on the edge of the outer peripheral wall 27 on the other side D2 in the axial direction. The fixed scroll 17 is fixed to the main bearing 11 by bolts or the like via the flange portion 28. A fixed scroll discharge port 29 is formed at the center of the spiral of the fixed scroll 17.

The swivel scroll 18 has a disc-shaped swivel end plate 23 and a swirl-shaped swirl lap 31 provided on the surface of the swivel end plate 23 on one side D1 in the axial direction. It is desirable that the swivel lap 31 is also configured to form an involute curve centered on the axis O1.

The swivel lap 31 faces the fixed lap 26 from the axis direction D and is arranged so as to overlap each other in the direction intersecting the axis line O1. In other words, the fixed lap 26 and the swivel lap 31 mesh with each other. In this meshed state, a constant space is formed between the fixed lap 26 and the swivel lap 31. The volume of this space changes as the swivel lap 31 swivels. This makes it possible to compress the refrigerant.

A cylindrical boss portion 30 is formed on the surface of the swivel end plate 23 on the other side D2 in the axial direction. The central axis of the boss portion 30 is coaxial with the eccentric axis O2. An eccentric shaft 16 formed on the rotating shaft 2 is fitted into the space inside the boss portion 30 from the axial direction D via the drivesh 32. A swivel bearing 33 is attached between the dry shoe 32 and the boss portion 30.

The main bearing 11 is provided with an old dam ring 22 for regulating the rotation of the swivel scroll 18 (rotation around the eccentric axis O2). The old dam ring 22 is formed with a protrusion that fits into a groove formed in the swivel end plate 23 of the swivel scroll 18. A thrust bearing 24 is provided inside in the radial direction when viewed from the old dam ring 22. The thrust bearing 24 supports a load in the axial direction D by the swivel scroll 18.

The upper cover 6 of the present embodiment will be described.
As shown in FIG. 2, the upper cover 6 has an upper cover main body 34 forming a discharge chamber 15 (see FIG. 1) and a reinforcing portion 37 (rib) provided on the surface 34a of the upper cover main body 34. doing. The upper cover main body 34 has a circular shape when viewed from the axial direction D, and forms a part of the discharge chamber 15.
The upper cover main body 34 has a cylindrical portion 35 and a dome portion 36 that closes D1 on one side in the axial direction of the cylindrical portion 35. The dome portion 36 has a spherical shape. The dome portion 36 and the cylindrical portion 35 are smoothly connected.

On the surface 34a of the upper cover main body 34, a plurality of reinforcing portions 37 extending along the surface 34a of the upper cover main body 34 are formed. The reinforcing portion 37 extends radially from the center T1 of the upper cover main body 34. The center T1 of the upper cover 6 is a point where the axis O1 and the upper cover 6 intersect.
The plurality of reinforcing portions 37 are formed at intervals in the circumferential direction. The plurality of reinforcing portions 37 are preferably formed at equal intervals in the circumferential direction. The reinforcing portion 37 is a ridge protruding from the surface 34a of the upper cover main body 34. The reinforcing portion 37 has a function of strengthening the upper cover main body 34.

Next, the design method of the scroll compressor 1 of the present embodiment will be described.
The design method of the scroll compressor 1 includes a compressor design process, a resonance mode measurement process, and a reinforcing portion design process.
The compressor design process is a process of designing a scroll compressor based on required performance, specifications, and the like. The designer selects (designs) the motor, designs the scroll, and designs the shape of the housing and upper cover. This determines the specifications of the motor, the shape of the discharge chamber, and the like.

In the resonance mode measurement process, a simulation is performed on a computer using a compressor model (analysis model) modeled based on the scroll compressor designed in the compressor design process, and the resonance mode (resonance mode) generated in the discharge chamber is performed. It is a process of measuring acoustic intrinsic value (acoustic characteristic, acoustic characteristic).

Specifically, first, a compressor model that can be input to a computer is created based on the designed scroll compressor. Next, the behavior of the compressor model is simulated on a computer using analysis software or the like.
Here, the operation of the scroll compressor 1 will be described. The refrigerant compressed by the compressor main body 4 (scroll) is periodically discharged from the fixed scroll discharge port 29 of the fixed scroll 17. The refrigerant that has passed through the fixed scroll discharge port 29 passes through the space between the fixed scroll 17 and the discharge cover 8. The refrigerant passes through the discharge port 20 of the discharge cover 8, enters the discharge chamber 15 defined by the upper cover 6, and escapes to the discharge pipe 10.

When the refrigerant flows through such a route, pressure pulsation occurs because the refrigerant is periodically discharged from the discharge valve 21 into the discharge chamber 15 (discharge space). When this pressure pulsation coincides with the natural frequency of the discharge chamber 15, resonance occurs. This resonance causes the upper cover 6 to vibrate.

FIG. 3 shows the resonance mode of the discharge chamber 15 measured by simulation. In addition, the resonance frequency is specified by simulation. In the case of the scroll compressor 1 of the present embodiment, the resonance frequency is 4 kHz-5 kHz.
In FIG. 3, the symbol + is a position where the pressure is increased by resonance, and the symbol − is a position where the pressure is decreased due to resonance, and these positions are the antinodes of the resonance mode.
The resonance mode is not limited to that shown in FIG. 3, and changes according to the shape of the discharge chamber 15 and the like. For example, the circumferential interval of the antinode in the resonance mode changes depending on the rotation speed of the rotation axis 2 and the like.

In the reinforcing portion designing step, the reinforcing portion 37 is designed on the surface 34a of the upper cover main body 34 based on the position of the antinode of the resonance mode specified in the resonance mode measuring step. Specifically, the reinforcing portion 37 is designed to pass through the antinode of the resonance mode.

According to the above embodiment, even when the position corresponding to the antinode of the resonance mode in the upper cover 6 vibrates due to the resonance, the vibration of the upper cover 6 can be suppressed by the reinforcing portion 37. That is, the noise due to vibration can be reduced by strengthening the position corresponding to the antinode of the resonance mode by the reinforcing portion 37.

The shape of the reinforcing portion 37 is not limited to this, and is provided on at least one of the front surface 34a and the back surface of the upper cover main body 34 so as to strengthen the antinode of the resonance mode, and is provided on at least one of the front surface 34a and the back surface. Any shape may be used as long as it extends along the line.
For example, as in the reinforcing portion 37B of the first modification shown in FIG. 4, the reinforcing portion 37B may be extended in the circumferential direction so as to pass through the antinode of the resonance mode. Specifically, the reinforcing portion 37B of the first modification of the present embodiment is a plurality of annular reinforcing portions formed concentrically. At least a part of the reinforcing portion 37B is formed so as to pass through the antinode of the resonance mode.
According to this modification, vibration can be suppressed even if the antinode of the resonance mode moves in the circumferential direction.

Further, as in the reinforcing portion of the second modified example shown in FIG. 5, the reinforcing portion 37 extending in the radial direction and the annular reinforcing portion 37B extending in the circumferential direction may be combined.
According to this modification, the rigidity of the upper cover main body 34 can be further improved.

Further, in the above embodiment, the periphery of the reinforcing portion 37 is reinforced by providing the reinforcing portion 37, but conversely, in the radial direction between adjacent resonance mode antinodes (resonance mode node). By forming a concave groove extending in the resonance mode, the portion corresponding to the antinode of the resonance mode may be relatively strengthened as compared with the other portions.

Further, the upper cover 6 in which the upper cover main body 34 and the reinforcing portion 37 are integrated may be manufactured by casting, or the upper cover 6 in which the upper cover main body 34 and the reinforcing portion 37 are integrated may be machined by cutting. You may.
The upper cover main body 34 and the reinforcing portion 37 may be formed separately and joined by welding or the like.

Further, the reinforcing portion 37 is not limited to the surface 34a of the upper cover 6 (the surface facing D1 on one side in the axial direction), and may be formed on the back surface of the upper cover 6. However, when the reinforcing portion 37 is formed on the back surface of the upper cover 6, the shape of the discharge chamber 15 changes, which is not preferable.
Further, the position of the reinforcing portion 37 may be determined by measurement using an actual machine without performing analysis.

[Second Embodiment]
Hereinafter, the compressor of the second embodiment of the present invention will be described in detail with reference to the drawings. In this embodiment, the differences from the first embodiment described above will be mainly described, and the description thereof will be omitted for the same parts.
The upper cover 6B of the compressor of the present embodiment has a polygonal pyramid shape having a top portion T2 protruding on one side D1 in the axial direction. That is, as shown in FIG. 6, it may be formed from a cylindrical portion 35B having a dodecagonal cross-sectional shape and a dome portion 36B having a bipyramid shape.

In the case of such a shape, the strength of the oblique ridge 39 (ridge line) of the bipyramid-shaped dome portion 36B is higher than the strength of the side surface 40. Therefore, the vibration can be suppressed by making the position of the oblique ridge 39 correspond to the antinode of the resonance mode. That is, the oblique ridge 39 of the bipyramid-shaped dome portion 36B serves as the reinforcing portion of the present embodiment. The upper cover 6B having such a shape can be manufactured by using sheet metal stamping.

Although the embodiments of the present invention have been described in detail above, various changes can be made without departing from the technical idea of the present invention.
For example, in the above embodiment, a scroll compressor is adopted as the compressor, but a rotary shaft that is driven to rotate, a compressor main body that periodically compresses and discharges a fluid by using the rotation of the rotary shaft, and a compressor main body. Any compressor may be provided with a cover that forms a discharge space into which the fluid discharged from the compressor is introduced. As the compressor, for example, it can be applied to a slope type compressor and a rotary compressor.

1 Scroll compressor 2 Rotating shaft 3 Motor 4 Compressor body 5 Housing 6,6B Upper cover (cover)
8 Discharge cover 9 Suction pipe 10 Discharge pipe 11 Main bearing 13 Sub bearing 15 Discharge chamber 16 Eccentric shaft 17 Fixed scroll 18 Swivel scroll 20 Discharge port 21 Discharge valve 23 Swivel end plate 25 Fixed end plate 26 Fixed wrap 29 Fixed scroll Discharge port 31 Swivel wrap 33 Swivel bearing 34 Upper cover body (cover body)
34a Surface 35 Cylindrical part 35B Cylindrical part 36 Dome part 37, 37B Reinforcing part 39 Oblique ridge 40 Side C Compression chamber D Axial direction D1 Axial direction One side D2 Axial direction The other side O1 Axial line O2 Eccentric axis

Claims (2)

A rotating shaft that is driven to rotate around an axis that extends in the vertical direction,
A compressor body that periodically compresses and discharges a fluid using the rotation of the rotating shaft, and
It is provided only on the surface of the cover body that forms a discharge space into which the fluid discharged from the compressor body is introduced, and the surface of the cover body, extends along the surface, and is formed at equal intervals. A cover with multiple reinforcements and
An electric motor that rotationally drives the rotating shaft around the axis, and
It has a cylindrical shape along the axis, and includes a housing for accommodating the motor, the rotating shaft, and the compressor body.
The cover is an upper cover that closes the upper end of the housing.
The housing has a cylindrical shape and has a cylindrical shape.
The cover body has a cylindrical portion having a cylindrical shape centered on the axis, and a dome portion having a curved surface shape that closes the upper part of the cylindrical portion and is smoothly connected to the cylindrical portion.
The reinforcing portion is a compressor that extends radially from the center of the dome portion, which is the center of the cover body, to the lower end of the cylindrical portion. The compressor according to claim 1, wherein the reinforcing portion extends in the circumferential direction with respect to the center of the cover body.

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