JP2004232545A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent temperature rise of a scroll compressor, and deterioration of efficiency by an influence of a compression spacing because of inconstant thermal expansion coefficient. <P>SOLUTION: Lap height 9 of a swing scroll 2 with large thermal expansion coefficient is set lower than lap height 8 of a stationary scroll 1 in consideration of expansion due to temperature rise at the time of operation. The lap height of a winding start side scroll lap with high temperature rise is set lower than that of a winding end side scroll lap with low temperature rise. At the same time, a seal member 12 is arranged, so as to realize a high efficient compressor in a wide range of temperature. <P>COPYRIGHT: (C)2004,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressor used for an air conditioner, a refrigeration apparatus, and the like, and relates to a scroll compressor capable of reducing leakage loss and enabling high-efficiency operation.
[0002]
[Prior art]
As a conventional scroll compressor, a fixed scroll in which a spiral scroll wrap is formed upright on a head plate and an orbiting scroll are meshed to form an arc-shaped compression chamber, and the orbiting scroll is restrained from rotating with respect to the fixed scroll. In some cases, the compression operation is performed by reducing the volume while moving the compression chamber from the outer peripheral side toward the inner peripheral side by rotating the compression chamber in a state. This scroll compressor has a problem that the compressed gas leaks from the meshing portion between the orbiting scroll and the fixed scroll and causes a reduction in efficiency, and various countermeasures have been conventionally proposed (for example, Patent Reference 1). FIG. 7 shows a conventional scroll compressor described in Patent Document 1.
[0003]
7, reference numeral 10 denotes a fixed scroll, 101 denotes a fixed scroll wrap, 20 denotes a turning scroll, and 201 denotes a turning scroll wrap. The fixed scroll wrap 101 and the turning scroll wrap 201 are engaged with each other to form the compression chamber 40. Reference numeral 30 denotes a depression formed at the center of the bottom surface between the scroll wraps. The lubricating oil retained in the depression 30 is brought to the side surface by viscous and centrifugal force on the mating scroll wrap top surface engaged with the bottom surface and side surface Sealing the corner space between them reduces leakage of compressed gas.
[0004]
[Patent Document 1]
JP-A-2000-29769 (pages 2 to 3, FIG. 1)
[0005]
[Problems to be solved by the invention]
On the other hand, in the scroll compressor, the temperature rise is relatively small in the outer peripheral portion on the suction side, and the temperature rise is higher in the central portion where the compression process has progressed. For this reason, in the case where the scroll wrap height is set to the same height at the outer peripheral portion and the central portion as in the conventional configuration, as a result of the thermal expansion of each scroll due to a temperature rise due to operation, the scroll wrap height is large at the central portion. Since thermal expansion occurs and the dimensional change due to thermal expansion is relatively small at the outer peripheral portion, the wrap leading end surface and the mating scroll bottom surface are in close contact with each other at the central portion, but the wrap leading end surface and the mating scroll bottom surface at the outer peripheral portion. There will be a large gap between them. As a result, leakage at the outer peripheral portion of the scroll becomes large, and in particular, a compressor operated under various compression conditions by the current inverter technology has a problem that the compression efficiency is extremely reduced under certain operation conditions.
[0006]
Further, in order to prevent the refrigerant gas from leaking from the gap between the scroll wrap distal end surface and the counterpart scroll end plate, a seal material is provided on the scroll wrap distal end surface over the entire range from the winding start to the winding end of the scroll wrap. In this type of scroll compressor, this type of scroll compressor is configured with a highly accurate involute curve except for the end of winding, and the end of winding is formed in a linear shape, so the sealing material is formed in accordance with this shape. Requires a highly accurate manufacturing process, has difficulties in terms of productivity and cost, and has a situation in which the sealing material can be provided only within a certain range from the winding start side.
[0007]
The present invention has been made to solve the above-mentioned conventional problems, and to provide a scroll compressor that is highly efficient in the entire operation range without the leakage loss being reduced due to thermal expansion due to a temperature rise during operation. Aim.
[0008]
[Means for Solving the Problems]
In order to solve the above-mentioned conventional problems, a scroll compressor according to the present invention is provided with a portion which is present on an outer peripheral side of an orbiting scroll and has a wrap height higher than other portions at a wrap winding end portion forming a suction portion. It was formed as follows.
[0009]
With this configuration, a temperature difference is generated between the outer peripheral portion of the scroll and the central portion due to the temperature rise due to operation, and the wrap height between the outer peripheral portion and the central portion is the same even when the thermal expansion is larger at the central portion. In addition, even under operating conditions in which the thermal expansion is small at a relatively low temperature and the leakage loss of the sliding portion of the compression chamber formed near the suction part is large, the leakage loss at the suction part is reduced and various operating conditions are obtained. , A highly efficient compressor can be realized.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0011]
(Embodiment 1)
FIG. 1 is a sectional view of a scroll-type hermetic compressor according to an embodiment of the present invention.
[0012]
In FIG. 1, reference numeral 2 denotes an orbiting scroll, and 1 denotes a fixed scroll, which are engaged with each other to form a compression chamber 40. Reference numeral 3 denotes a suction hole for sucking the refrigerant, 4 denotes a discharge hole for discharging the compressed refrigerant, and 5 denotes an Oldham coupling for restricting the rotation of the orbiting scroll 2. The rotary shaft 6 is driven by the electric motor 7 to rotate and rotate. The compression is performed by the orbital movement of the scroll 2. Reference numeral 12 denotes a sealing material fitted on the upper surface of the orbiting scroll wrap 9. The sealing material is passed through an oil supply hole 15 in the orbiting scroll 2 through an inner diameter of the rotary shaft 6 by using an oil pump 14. 12 and the orbiting scroll 2 are refueled.
[0013]
FIG. 2 is a diagram showing a shape of the orbiting scroll 2 in FIG. 1 as viewed from above. In FIG. 2, the center side of the orbiting scroll wrap 9 is the winding start portion, and is the discharge side. The outer peripheral side of the orbiting scroll wrap 9 is the end of winding and is on the suction side. As shown in the figure, the sealing material 12 is provided up to a predetermined angle from the winding start portion of the orbiting scroll wrap 9. The fixed scroll 1 and the orbiting scroll 2 are made of materials having different coefficients of thermal expansion. The orbiting scroll 2 has a larger coefficient of thermal expansion than the fixed scroll 1. The height of the wrap from the start of winding to the end of winding during operation is set lower than the height of the fixed scroll wrap 8 in consideration of the temperature rise during operation. The seal member 12 is provided to reduce leakage loss between the compression chambers. The seal member 12 floats from the mating surface of the orbiting scroll 2 by oil supplied to the seal member 12 during operation. With this configuration, the gap between the fixed scroll 1 and the fixed scroll 1 can be reduced due to the thermal expansion and the floating of the sealing material 12 during operation, and the leakage loss can be reduced.
[0014]
(Embodiment 2)
FIG. 3 is a diagram showing a shape of the orbiting scroll 23 according to Embodiment 2 of the present invention as viewed from above. FIG. 4 is a diagram in which the horizontal axis represents the scroll wrap angle from the start of winding and the vertical axis represents the wrap height at the angle in the orbiting scroll 23 of FIG.
[0015]
In FIG. 3, the center side of the orbiting scroll wrap 93 is the winding start portion, and is the discharge side. The outer peripheral side of the orbiting scroll wrap 93 is the end of winding and is on the suction side. Since the temperature rise of the orbiting scroll 23 due to the operation becomes highest in the central portion, the thermal expansion in the central portion becomes maximum. For this reason, the wrap height at the center is set as the reference height, the part from the start of winding to a certain angle α is processed to the reference height, and from the α to the end of winding, the wrap height is increased by the height h as shown in FIG. By working high, the floating of the sealing material 12 is not sufficient especially at low speed and low temperature, and the leakage loss can be reduced even under the condition that the thermal expansion of the wrap portion is reduced and the leakage loss is increased. Overall efficiency is improved.
[0016]
(Embodiment 3)
FIG. 5 is a diagram showing a shape of the orbiting scroll 25 according to Embodiment 3 of the present invention as viewed from above. FIG. 6 is a diagram in which the horizontal axis represents the scroll wrap angle from the start of winding and the vertical axis represents the wrap height at that angle for the orbiting scroll 25 in FIG.
[0017]
In FIG. 5, the center side of the orbiting scroll wrap 95 is the winding start portion, and is the discharge side. The outer peripheral side of the orbiting scroll wrap 95 is the end of winding and is on the suction side. Since the temperature rise of the orbiting scroll 25 due to the operation becomes highest in the central portion, the thermal expansion in the central portion becomes maximum. For this reason, the wrap height at the center is set as the reference height, the part from the start of winding to a certain angle α is processed to the reference height, and from the α to the end of winding, the wrap height is increased by the height h as shown in FIG. The high processing makes it possible to reduce the leakage loss even under the condition that the floating of the sealing material 12 is not sufficient especially at low speed or low temperature, and the thermal expansion of the wrap portion is reduced and the leakage loss is increased. Overall efficiency is improved. Further, the wrap height is reduced by I from the angle β toward the winding end. This is because when the orbiting scroll wrap 95 comes into contact with the bottom surface of the fixed scroll 1 under the condition that the thermal expansion of the orbiting scroll wrap 95 is large under the condition of high speed and high temperature, the winding end portion is increased. This is for preventing stress from concentrating on the leading end, preventing the sliding loss from increasing, and preventing the orbiting scroll wrap 95 from being damaged. This improves reliability and performance under all operating conditions and improves overall compressor efficiency.
[0018]
【The invention's effect】
As described above, according to the scroll compressor of the present invention, it is possible to provide an efficient scroll compressor that prevents compressed gas leakage due to a difference in thermal expansion due to a difference in temperature between the center and the outer periphery of the scroll. .
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a compressor according to Embodiment 1 of the present invention. FIG. 2 is a diagram showing a shape of an orbiting scroll 2 in FIG. 1 as viewed from above. FIG. FIG. 4 is a diagram showing the height of the orbiting scroll wrap in Embodiment 2 of the present invention. FIG. 5 is a diagram showing the orbiting scroll in Embodiment 3 of the present invention. FIG. 6 is a diagram showing the orbiting scroll wrap in Embodiment 3 of the present invention. FIG. 7 shows a height. FIG. 7 shows a conventional scroll compressor.
REFERENCE SIGNS LIST 1 fixed scroll 2 orbiting scroll 3 suction hole 4 discharge hole 5 Oldham coupling 6 rotary shaft 7 electric motor 10 fixed scroll 20 orbiting scroll 30 depression 40 compression chamber 101 fixed scroll wrap 102 orbiting scroll wrap

Claims (3)

A compression chamber is formed by combining a fixed scroll in which a spiral scroll wrap is formed upright on a head plate and a orbiting scroll in which a spiral scroll wrap is formed upright on a mirror plate so that respective scroll wraps mesh with each other. A scroll compressor that performs a compression operation by reducing a volume while moving a compression chamber from an outer peripheral side to an inner peripheral side by rotating a scroll in a state in which rotation is restricted, wherein the orbiting scroll is the fixed scroll. A scroll compressor comprising a material having a larger coefficient of thermal expansion than that of the scroll scroll, wherein the wrap height of the orbiting scroll is set lower than the wrap height of the fixed scroll at room temperature before operation. A compression chamber is formed by combining a fixed scroll in which a spiral scroll wrap is formed upright on a head plate and a orbiting scroll in which a spiral scroll wrap is formed upright on a mirror plate so that respective scroll wraps mesh with each other. A scroll compressor that performs a compression operation by reducing the volume while the compression chamber moves from the outer peripheral side toward the inner peripheral side by performing eccentric rotation in a state where the orbiting scroll is restrained from rotating. A seal material is disposed on a scroll wrap upper end surface in a first range from a winding start of the orbiting scroll to a predetermined position not including a winding end, the seal material being made of a material having a larger coefficient of thermal expansion than the fixed scroll, In the second range including the part of the range 1 and reaching the end of the scroll winding, Scroll compressor being characterized in that formed as the wrap height than Le winding start is high. 3. The scroll compressor according to claim 2, wherein the second range is formed so that the scroll wrap height is lower at the end of scroll winding than at other portions.

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