JP4130285B2 - Cooling structure in scroll fluid machine - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention provides a cooling fin on the surface opposite to the fixed scroll and the orbiting scroll lap, and is connected to the rotating shaft of the motor so as to be integrally coupled to the cooling fin side of the orbiting scroll. The present invention relates to a cooling structure in a scroll fluid machine that includes a driving member to be driven and forcibly cools by flowing a cooling gas in one direction.
[0002]
[Prior art]
Various scroll fluid machines for forced cooling by flowing a cooling gas in one direction are known. JP-A-9-144673 (prior art publication) is one of them.
According to the prior art [FIG. 1], this technology includes a turning scroll 10 and a cover member 12 fixed to the turning scroll 10 with screws, and the cover member has a large diameter having radial cooling fins on the outer periphery. The boss portion 12A of the cover member has a boss portion 12B for a small-diameter auxiliary crank having a radial cooling fin on the outer periphery thereof, and the orbiting scroll and the cover member are integrally coupled. The orbiting scroll can be driven by the drive shaft 2 connected to the motor, the back surface of the boss portion is formed as a space 17 and is separated from the radiation fin on the orbiting scroll side.
[0003]
[Problems to be solved by the invention]
According to the above-described prior art, since the back surface of the boss portion is formed as the space portion 17, the cooling air can be introduced into the space portion 17, the boss portion 17 can be cooled, and the slewing bearing provided on the boss portion 17A. Thus, it is possible to prevent the compression heat from being transmitted from the orbiting scroll and to keep the orbiting bearing in a low temperature state.
[0004]
However, after the compression ratio and the compression capacity of the scroll fluid machine are determined, the thickness of the cover member, the boss part that drives the orbiting scroll and the auxiliary so as to withstand the compression ratio and the compression capacity when designing the cover member. If the shape of the boss portions for the crank is determined and cooling fins are provided on the outer circumferences of these boss portions, the outer diameter of the cover member and thus the outer diameter of the orbiting scroll will be increased.
[0005]
Further, the cover member transmits a rotational driving force to the orbiting scroll side, and stress is generated because the auxiliary crank portion restricts the rotation of the orbiting scroll. Therefore, the auxiliary crank boss portion is It is necessary to form it firmly and connect the cover member to the orbiting scroll to be firmly integrated.
[0006]
In addition, it is necessary to fix the screws in a state where the necessary cooling space is separated from the surface on which the cooling fins of the orbiting scroll are provided, and a support is planted on the orbiting scroll side or the cover member side to contact the other side surface. Although a means for screwing can be considered, it is desirable that the support column has a considerably large contact area.
And if a support | pillar with a large contact area is provided, an extra weight will increase.
[0007]
Further, even if the orbiting scroll and the cover member are in partial contact with each other and the other part is floating, the floating part is reduced as much as possible, and the contact part and the floating part are average. It is desirable that the stress is distributed in a small amount.
[0008]
Moreover, it can cool more favorably by cooling not only on the turning scroll side but also on the fixed scroll side. Therefore, it is desired to be able to adjust the cooling space on the fixed scroll side.
[0009]
In view of the above circumstances, an object of the present invention is to provide a cooling structure in a scroll fluid machine that can cool the heat generation on the orbiting scroll side satisfactorily.
Another object of the present invention is to provide a cooling structure in a crawl fluid machine in which a turning scroll and a driving member for driving the scroll are firmly integrated.
Another object of the present invention is to easily adjust the cooling space volume by disposing a lid member from which the cooling fin side of the fixed scroll can be removed, and interposing a spacer between the lid member and the fixed scroll. It is to provide a cooling structure in a crawl fluid machine that can be configured.
[0010]
[Means for Solving the Problems]
The present invention provides a cooling fin on the surface opposite to the fixed scroll and the orbiting scroll lap, and is connected to the rotating shaft of the motor so as to be integrally coupled to the cooling fin side of the orbiting scroll. In a cooling structure in a scroll fluid machine that includes a driving member for driving and forcibly cools by flowing a cooling gas in one direction,
The drive member is provided with auxiliary crank boss portions at three circumferential positions, and an attachment hole with the orbiting scroll is provided at one corner of each auxiliary crank boss portion,
A cooling fin having the same height as the back surface of the auxiliary crank boss is provided on the back surface of the driving member along the direction in which the cooling gas flows, and the motor of the cooling fin provided on the back surface of the driving member is rotated. The height of the boss portion corresponding to the rotating shaft corresponding to the boss portion for rotating shaft connected to the shaft is configured to be low except for the central portion of the corresponding portion of the rotating shaft boss,
At least a back surface of the auxiliary crank boss portion and a central portion of the rotating shaft boss portion corresponding portion are in contact with a cooling fin top portion on the orbiting scroll side to be integrated with the orbiting scroll.
[0011]
In the present invention, the drive member attached to the orbiting scroll is provided with auxiliary crank boss portions in three circumferential directions, and an attachment hole with the orbiting scroll is provided at one corner of each auxiliary crank boss portion. At least the back surface of the auxiliary crank boss portion and the central portion of the rotating shaft boss portion corresponding portion can be brought into contact with the cooling fin top portion on the orbiting scroll side to be integrated with the orbiting scroll, and there are three abutting portions. The auxiliary crank boss part and the central part, and the fixed part is the auxiliary crank boss part substantially equidistant from the central part, and both can be firmly integrated.
[0012]
In the present invention, the cooling fin having the same height as the back surface of the auxiliary crank boss is provided on the back surface of the drive member along the direction in which the cooling gas flows, and the cooling fin provided on the back surface of the drive member. Since the height of the boss portion corresponding to the rotating shaft corresponding to the boss portion for rotating shaft connected to the rotating shaft of the motor of the fin is configured low except for the central portion of the corresponding portion of the rotating shaft boss portion, When the back part of the auxiliary crank boss part and the central part of the part corresponding to the rotating shaft boss part come into contact with the cooling fin top part on the orbiting scroll side and are integrated with the orbiting scroll, it corresponds to the rotating axis boss part. The cooling fin portion having a lower portion forms a cooling space.
[0013]
In addition, when both are integrated, the back surface of the auxiliary crank boss is in contact with a plurality of cooling fins for the orbiting scroll. In this case, the orbiting scroll is The back surface of the auxiliary crank boss can be held in contact with a wide portion.
[0014]
In addition, a plurality of cooling fins that contact the cooling fins planted at the same height as the back surface are provided on the orbiting scroll,
It is also an effective means of the present invention to provide a mounting portion for the drive member on the cooling fin that contacts the back surface of the auxiliary crank boss portion, and it is not necessary to separately provide a support column and attach it to the support column. The weight of is reduced.
[0015]
Further, assuming that the top area of the cooling fin provided in the portion corresponding to the rotating shaft boss portion on the back surface of the driving member is N, the area of the central portion having a height that contacts the cooling fin of the orbiting scroll is N / 6 or less. Setting is also an effective means of the present invention, and the orbiting scroll abuts and holds the central portion of the portion corresponding to the rotating shaft boss portion, so that the drive member can be securely attached to the orbiting scroll, and from the orbiting scroll side The contact with the cooling fin is an area of 1/6 or less of the cooling space, and the transmission path of the compression heat is small. Therefore, the influence of the compression heat on the drive member side is small in a short time, and the volume for cooling the compression heat is small. Therefore, the cooling effect is sufficient, and the compression heat transmitted from the central portion is cooled by cooling fins provided on the outer peripheral side of the drive member.
[0016]
In addition, the drive member includes the rotating shaft boss portion having a recess that is open at one side at a central portion of one surface of a plate-like body formed in a substantially circular shape and surrounded by a circular wall surface;
The auxiliary crank boss portion having a recess that is open on the same side as the rotary shaft boss portion and surrounded by the circular wall surface outside the circular wall surface of the rotary shaft boss portion, and attachment to the orbiting scroll A hole,
It is also an effective means of the present invention that both boss portions are arranged close to each other with the circular wall surfaces of both boss portions separated from each other.
[0017]
According to this technical means, since the rotating shaft boss portion and the auxiliary crank boss portion are arranged close to each other, the scroll fluid machine can be configured in a small size.
In addition, since both boss portions are arranged close to each other with the circular wall surfaces of both boss portions separated from each other, the circular wall surfaces of both boss portions are integrated to increase the thickness. Without increasing the thickness of the part and taking measures against distortion without increasing the weight,
A small scroll fluid machine can be constructed.
[0018]
It is also an effective means of the present invention that a plurality of mounting holes for the orbiting scroll are provided at symmetrical positions with reference to a line connecting the center of the auxiliary crank boss and the center of the drive member.
According to such technical means, at least two auxiliary crank boss portions are attached to the left and right symmetrical positions, so that the attachment is more reliable, the weight balance is good, and the operation is stable.
[0019]
The fixed scroll is provided with a fixed scroll cooling fin on a surface opposite to the fixed scroll wrap, and a lid member that covers the fixed scroll cooling fin except the fluid suction hole and the compressed fluid discharge hole is provided on the fixed scroll. Arranging in a removable manner is also an effective means of the present invention. By removing the lid member and attaching the lid member to the fixed scroll via a spacer, the cooling space on the fixed scroll side is increased, and the cooling efficiency is further improved. be able to.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail with reference to embodiments shown in the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention only to specific examples unless otherwise specified. Not too much.
[0021]
FIG. 1 is a cross-sectional view of a scroll fluid machine according to an embodiment of the present invention, FIG. 2 is a cross-sectional view of a turning scroll and a drive member, and FIG. 3 is a view taken in the direction of arrows AA in FIG.
In FIG. 1, a scroll fluid machine includes a fixed scroll 4 having a number of cooling fins 4b on the back, a main body housing 10 in which a turning scroll is disposed, a support portion 12 that holds a rotation drive shaft 9 of a motor, and a motor housing 13. It consists of.
[0022]
The rotation drive shaft 9 of the motor is held by the support portion 12 on the left side, and further, the left side is fitted with a joint 7 having an end portion 7a connected to a rotation shaft boss portion 61 to be described later via a bearing.
[0023]
On the other hand, a sliding surface 4g that is recessed and formed in a substantially circular cross-sectional rectangular shape is provided inside the end plate of the fixed scroll 4, and a discharge port 4d that discharges a compressed fluid at the center of the sliding surface 4g. Is opened, and a discharge opening 4e having a diameter larger than that of the discharge opening 4d is opened to the outside, and a discharge cylinder 23 is disposed in the discharge opening 4e.
[0024]
On the sliding surface 4g, a wrap 4a is planted spirally from the vicinity of the discharge port 4d toward the outer peripheral side, and a concave groove is recessed from the central portion toward the outer peripheral portion at the upper end ridge of the wrap. In the groove, a self-lubricating chip seal 22 such as a fluorine-based resin that is brought into contact with the mating sliding surface to be sealed is inserted.
[0025]
In the fixed scroll 4, a fluid suction port 4c communicating with the sliding surface 4g is opened with an opening in the front. A plurality of cooling fins 4b are implanted in a direction perpendicular to the upper surface of FIG. 1 on the front surface (back surface of the fixed scroll) where the suction port 4c is opened, and from the outer peripheral surface of the cylindrical portion 4h where the discharge opening 4e is provided. Similarly, cooling fins are arranged in the direction perpendicular to the upper surface of FIG.
[0026]
Further, a side cover (lid member) 20 having a discharge opening 20a at a position corresponding to the discharge opening 4e is provided on the back side of the fixed scroll 4, and a mounting portion 4k in which a part of the cooling fin is formed with a large diameter. Is detachably attached. A cooling space on the fixed scroll side can be adjusted by improving the cooling efficiency by attaching the side cover 20 with a cylindrical spacer as appropriate at the tip of the mounting portion 4k.
[0027]
Further, a concave groove is formed in the inner side surface 4m of the fixed scroll 4 so as to surround the outer peripheral portion of the wrap 4a. A dust seal 21 having a self-lubricating property such as a fluorine-based resin is inserted so as not to enter.
[0028]
The orbiting scroll 5 is disposed in the main body housing 10, and a wrap 5 a that is in contact with the wrap 4 a of the fixed scroll 4 to form a sealed space for compressing fluid is implanted on the sliding surface 5 g.
A large number of cooling fins 5b, 5c, 5d, and 5e are arranged on the back side of the orbiting scroll 5 in the vertical direction on the paper surface of FIG.
[0029]
As indicated by a one-dot chain line in FIG. 3, the cooling fins 5b, 5c, 5d, and 5e are formed in a wave shape along the direction in which the cooling air flows indicated by an arrow 24, and the cooling fins 5c, 5d, and 5e are included. Is provided with a receiving portion 51 having a diameter larger than the cooling fin width, and the receiving portion 51 is provided with a screw hole (not shown).
[0030]
Further, a turning auxiliary plate (drive member) 6 attached to the receiving portion 51 of the orbiting scroll 5 is screwed (not shown). The turning auxiliary plate 6 is provided with a recess 6a, and the recess 6a is connected to the eccentric shaft portion 7a of the joint 7 via a bearing.
One end is supported by the main body housing 10 on the outer peripheral portion of the turning auxiliary plate, and the other ends of three pairs of rotation prevention mechanisms (auxiliary crank portions) 14 are supported at three positions in the circumferential direction by 120 °. Via the anti-rotation mechanism 14, the orbiting scroll 5 is disposed so as to revolve with a rotational center eccentric from the fixed scroll 4.
[0031]
As shown in FIG. 2, the drive member 6 includes a rotating shaft boss portion 61, an auxiliary crank boss portion 60 on the outer side of the circular wall surface of the rotating shaft boss portion, and a circular shape of both boss portions. Since the wall surfaces are separated from each other, that is, the outer periphery 60Aa of the auxiliary crank boss portion 60 and the outer periphery 6d of the rotary shaft boss portion 61 are arranged close to each other with the wall surfaces separated from each other. It can be configured in a small size.
In addition, since both boss portions are arranged close to each other with the circular wall surfaces of both boss portions separated from each other, the circular wall surfaces of both boss portions are integrated to increase the thickness. Without increasing the thickness of the part and taking measures against distortion without increasing the weight,
A small scroll fluid machine can be constructed.
[0032]
FIG. 3 is a view taken along the line AA in FIG. 2. Of the three auxiliary crank boss portions 60, four orbiting scroll cooling fins 5 b and a receiving portion 51 are provided on the back surface of the boss portion 60 A. The fins 5c abut against each other, and the three cooling fins 5b and the two cooling fins 5d and 5e abut against the back surfaces of the boss portions 60B and 60C.
Note that the cooling fins of the orbiting scroll that are in contact with the back surfaces of the boss portions 60A, 60B, and 60C may extend from top to bottom in FIG.
[0033]
Further, the portion surrounded by the one-dot chain line 6d that means the outer peripheral wall of the rotating shaft boss portion 61 corresponding to the back surface of the rotating shaft boss portion 61 is other than the two 6bh and 6bh located in the center portion, As shown by 6c in FIG. 2, the cooling space is formed without being in contact with the cooling fins of the orbiting scroll from the compression heating portion (shaded portion) of the wrap space of the orbiting scroll.
[0034]
In the present embodiment, as described above, the drive member 6 attached to the orbiting scroll is provided with the auxiliary crank boss portions 60 at three locations in the circumferential direction, and the orbiting scroll and the auxiliary scroll boss portions are provided at one corner of the auxiliary crank boss portion. Mounting holes 60a are provided, so that the cooling fins of the orbiting scroll are brought into contact with the back surface of the auxiliary crank boss 60, and the cooling fins 60bh and 60bh at the center of the corresponding portion of the rotating shaft boss are used for the orbiting scroll. The orbiting scroll and the drive member 6 can be integrated by coming into contact with the cooling fin top on the side and inserting a screw into the attachment hole 60a and attaching it to the attachment portion of the cooling fin top of the orbiting scroll.
[0035]
At that time, the abutting portion is the three auxiliary crank boss portions and the central portion, the fixed portion is the auxiliary crank boss portion approximately equidistant from the central portion, and the back surface of the auxiliary crank boss portion. Is in contact with a plurality of cooling fins for the orbiting scroll, the orbiting scroll can abut and hold the back surface of the auxiliary crank boss portion at a wide portion, and can firmly integrate the two. .
[0036]
As shown in FIG. 3, two mounting holes 60a of the driving member 6 to the orbiting scroll are provided at symmetrical positions with respect to a line connecting the center of the auxiliary crank boss and the center of the driving member. Therefore, the mounting reliability increases, the weight balance is good, and the operation is stable.
[0037]
As described above, in the present embodiment, since the mounting portion of the driving member is provided on the cooling fin that contacts the back surface of the auxiliary crank boss portion, it is not necessary to separately provide a support column and attach it to the support column. The overall weight of the scroll is reduced.
[0038]
The fixed scroll is provided with a fixed scroll cooling fin on a surface opposite to the fixed scroll wrap, and a cover member covering the fixed scroll cooling fin except for a fluid suction hole and a compressed fluid discharge hole is provided on the fixed scroll. Since it is arranged so as to be removable, the cooling space on the fixed scroll side is increased by removing the lid member and attaching the lid member to the fixed scroll via a spacer, and the cooling efficiency can be further improved.
[0039]
【The invention's effect】
As described above, the present invention can firmly integrate the drive member and the orbiting scroll, reduce the contact area of the cooling fin from the orbiting scroll side to the back surface of the rotating shaft boss portion, and reduce the cooling. Since the volume of the cooling space in which the fins are present is increased, the cooling efficiency is improved, and a cooling structure that improves the compression efficiency can be provided.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view of a scroll fluid machine according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view of a turning scroll and a drive member.
FIG. 3 is a view taken along arrow AA in FIG. 2;
[Explanation of symbols]
4 fixed scroll 5 orbiting scroll 6 driving member (rotary auxiliary plate)

Claims (5)

A driving member for driving the orbiting scroll by providing a cooling fin on a surface opposite to the wrap of the fixed scroll and the orbiting scroll, coupled to the rotating shaft of the motor, and integrally coupled to the cooling fin side of the orbiting scroll. In a cooling structure in a scroll fluid machine that forcibly cools by flowing a cooling gas in one direction,
The drive member is provided with auxiliary crank boss portions at three circumferential positions, and an attachment hole with the orbiting scroll is provided at one corner of each auxiliary crank boss portion,
A cooling fin having the same height as the back surface of the auxiliary crank boss is provided on the back surface of the driving member along the direction in which the cooling gas flows, and the motor of the cooling fin provided on the back surface of the driving member is rotated. The height of the boss portion corresponding to the rotating shaft corresponding to the boss portion for rotating shaft connected to the shaft is configured to be low except for the central portion of the corresponding portion of the rotating shaft boss,
In the scroll fluid machine, wherein at least a rear surface of the auxiliary crank boss portion and a central portion of the rotating shaft boss portion corresponding portion are in contact with a cooling fin top portion on the orbiting scroll side and integrated with the orbiting scroll. Cooling structure. A plurality of cooling fins that come into contact with the back surface of the auxiliary crank boss when mounted integrally with the orbiting scroll, and a plurality of cooling fins that come into contact with the cooling fins planted at the same height as the back surface. Provided on the orbiting scroll,
A mounting portion for the drive member is provided on the cooling fin that comes into contact with the back surface of the auxiliary crank boss,
When the top area of the cooling fin provided in the portion corresponding to the rotating shaft boss portion on the back surface of the driving member is N, the area of the central portion having a height that contacts the cooling fin of the orbiting scroll is set to N / 6 or less. The cooling structure in the scroll fluid machine according to claim 1. The drive member has the rotating shaft boss portion having a recess that is open at one side at a central portion of one surface of a plate-like body formed in a substantially circular shape and surrounded by a circular wall surface;
The auxiliary crank boss portion having a recess that is open on the same side as the rotary shaft boss portion and surrounded by the circular wall surface outside the circular wall surface of the rotary shaft boss portion, and attachment to the orbiting scroll A hole,
2. The cooling structure in a scroll fluid machine according to claim 1, wherein both boss portions are arranged close to each other in a state where the circular wall surfaces of both boss portions are separated from each other. The mounting hole to the orbiting scroll is provided with a plurality of symmetrical positions with reference to a line connecting the center of the auxiliary crank boss and the center of the driving member. Cooling structure in scroll fluid machine.   The fixed scroll is provided with a fixed scroll cooling fin on a surface opposite to the fixed scroll wrap, and a lid member covering the fixed scroll cooling fin is removable from the fixed scroll except for a fluid suction hole and a compressed fluid discharge hole. The cooling structure in the scroll fluid machine according to claim 1, wherein the cooling structure is disposed in the scroll fluid machine.

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