JPH0248718Y2 - - Google Patents

Description

[Detailed description of the invention] (Field of industrial application) The present invention is a scroll-type fluid machine, more specifically, it is equipped with a fixed scroll and a revolving scroll, and a sliding body and a sliding body holder on the back side of the revolving scroll. The present invention relates to a scroll type fluid machine provided with a rotation prevention mechanism and in which the revolving scroll is driven by a crankshaft.

(Prior Art) This type of fluid machine is already known, as described in, for example, Japanese Patent Laid-Open No. 55-35152. This will be explained based on FIG.
2, and a rectangular portion 55 having a rectangular outer surface that makes sliding contact with the inner surface of the sliding body 54 of the rotation prevention mechanism B, and a receiving portion 5 that receives the thrust bearing 56.
A flange body 58 consisting of is connected to the revolving scroll 50, and
The orbiting scroll 50 is supported by the thrust bearing 56 via the receiving portion 57 of the flange body 58.

In FIG. 5, 59 is a rotor coupled to the eccentric shaft portion 52, and this rotor 59 is supported in the axial direction by a frame 61 via a thrust bearing 60. Further, 62 is a fixed scroll.

(Problems to be Solved by the Present Invention) In the conventional system, in order to connect the rotation prevention mechanism B to the back surface of the revolving scroll 50 and to support the revolving scroll 50 on the thrust bearing 56, Since the flange body 58 was formed separately from the scroll 50, there was a problem that the number of parts increased and the structure became complicated. Therefore, the present inventors formed a sliding surface (hereinafter referred to as the first sliding surface) 63 for the thrust bearing 56 on the back surface of the revolving scroll 50, as shown in FIG. The thrust shaft 56 is brought into direct sliding contact, and a pair of sliding contact surfaces (hereinafter referred to as second sliding surfaces) 64 for the sliding body 54 are formed on the outer surface of the bearing sleeve 53, so that the bearing sleeve 53 The idea was to directly engage the anti-rotation mechanism B and omit the flange body 58.

However, when the first and second sliding surfaces 63 and 64 are machined using a milling machine, if one is machined and then the other is machined, the cutting tool for post-machining comes into contact with the previously machined surface. For this reason, end mills and face milling tools that can cut two perpendicular surfaces at the same time are generally used. When machining two surfaces at the same time using a face milling tool, there were advantages and disadvantages, and there was a problem that the precision of one surface could not be achieved on the other surface. After that, when processing the second sliding surface 64, the previously processed first sliding surface 63 is affected by the post-processing cutting tool, and the first sliding surface 64 is
There was a problem in which a step C remained on the sliding surface 63 as shown in FIG. 6.

(Means for Solving the Problem) Therefore, the present invention provides a length in the axial direction between a sliding surface for the thrust bearing provided on the back surface of the revolving scroll and a sliding surface for the rotation prevention mechanism. By interposing the step part with
While both of these sliding surfaces are formed on the above-mentioned revolving scroll, it is possible to easily process each of these sliding surfaces, and the specific configuration includes a fixed scroll and a revolving scroll. ,
A scroll-type fluid machine in which a rotation prevention mechanism consisting of a sliding body and a sliding body support is provided on the back side of the revolving scroll, and the revolving scroll is driven by a crankshaft. A sliding surface is provided, and the revolving scroll is supported by a thrust bearing that is in sliding contact with the first sliding surface, and a bearing sleeve is provided in the center of the revolving scroll for receiving an eccentric shaft portion of the crankshaft, The outer circumferential surface of the bearing sleeve is rectangular to form a pair of second sliding surfaces that make sliding contact with the sliding body, while the base of the bearing sleeve has a circular shape having a step in the axial direction with respect to the first sliding surface. A stepped section was created.

(Function) Since the circular stepped portion having the length in the axial direction is formed between the first and second sliding surfaces as described above, while both the first and second sliding surfaces are formed on the revolving scroll, Machining of the first sliding surface and machining of the second sliding surface can be performed independently with the circular stepped portion as a boundary, and when machining each of these sliding surfaces, these sliding surfaces can be processed independently. Machining can be done without the cutting tool interfering with other surfaces.

Therefore, each sliding surface can be processed using a processing tool that is suitable for these sliding surfaces, and each sliding surface can be processed without considering the processing order of the first sliding surface and the second sliding surface. The sliding surface can be easily machined, and the tool used to machine one sliding surface can be used to machine the other sliding surface without affecting it.
This also eliminates the problem of remaining stages.

(Example) A scroll type fluid machine according to the present invention will be explained below with reference to an example shown in the drawings.

The scroll-type fluid machine shown in FIGS. 2 and 3 is applied to a compressor for a refrigeration system, and is provided with a compression element A formed by a fixed scroll 2 and a revolving scroll 3 at the inner upper part of a hermetic casing 1. In addition, a motor 4 is provided at the lower part of the casing 1, and a crankshaft 5 coupled to the motor 4 is provided.
The eccentric shaft portion 5a is supported by a bearing in a bearing sleeve 3a formed on the back side of the revolving scroll 3.

Furthermore, a frame 6 is provided at the inner upper part of the casing 1.
is assembled, the fixed scroll 2 is fixed to the upper part of the frame 6, and a thrust bearing 7 is interposed between the frame 6 and the revolving scroll 3,
While the revolving scroll 3 is supported to freely slide, the motor 4 is fixed to the lower part of the frame 6.

A rotation prevention mechanism 8 is provided on the back side of the revolving scroll 3, and the rotation prevention mechanism 8 prevents the rotation of the revolving scroll 3. As shown in FIG. 3, this rotation prevention mechanism 8 engages with a rectangular outer surface (second sliding surface 18) of the bearing sleeve 3a, which will be described in detail later, and restricts the sliding direction of the bearing sleeve 3a. It consists of a sliding body 9 and a sliding body receiver 10 that engages with two opposing rectangular outer surfaces of the sliding body 9 to regulate the sliding direction of the sliding body 9.

Further, a suction pipe 11 is connected to the casing 1, and the pressure inside the casing 1 is made low to open a suction port 12 provided in the compression element A in the casing 1, while a discharge port also provided in the compression element A is opened in the casing 1. A discharge pipe 14 is connected to 13 so that the discharge pipe 14 is opened to the outside of the casing 1.

Thus, as the motor 4 drives the revolving scroll 3 to revolve around the fixed scroll 2, the compression element A sucks the low-pressure refrigerant from the suction port 12, compresses the refrigerant, and converts it into a high-pressure refrigerant. is discharged from the casing 1 through the discharge pipe 14.

In the scroll type fluid machine configured as above, the revolving scroll 3 is configured as schematically shown in FIGS. 1 and 4, and
A spiral wrap 16 is provided on one side of the end plate 15, while a spiral wrap 16 is provided on the back side of the revolving scroll 3,
The thrust bearing 7 is provided on the outer peripheral side of the end plate 15.
In addition to forming an annular first sliding surface 17 for receiving the bearing, the bearing sleeve 3a that pivotally supports the eccentric shaft portion 5a is provided at the center of the back surface of the scroll 3, and the outer periphery of the bearing sleeve 3a A pair of second sliding surfaces 18 having rectangular surfaces and slidingly contacting the inner surface of the sliding body 9
Further, a circular stepped portion 19 having a step in the axial direction with respect to the first sliding surface 17 is provided at the base of the bearing sleeve 3a.

As described above, since the finishing process after casting is performed with the circular stepped portion 19 provided, the stepped portion 19 allows the machining of the first sliding surface 17 and the machining of the second sliding surface 18 to be performed. This allows the sliding surfaces 17 and 18 to be machined independently, avoiding interference with the other surface by the machining tool.

Therefore, it is possible to use a suitable cutting tool for each of the sliding surfaces 17 and 18, and it is also possible to easily process the respective sliding surfaces 17 and 18 without considering the processing order. , for example, the first
After lathe-machining the sliding surface 17, the second sliding surface 18
Even when machining using a milling machine, this milling tool allows the machining to be performed without affecting the first sliding surface 17, and it is possible to prevent step residues from forming on the first sliding surface 17. .

(Effect of the invention) As described above, the present invention has the above-mentioned revolving scroll 3.
The bearing sleeve 3a is provided with the second sliding surface 18 while forming both a first sliding surface 17 for the thrust bearing 7 and a second sliding surface 18 for the rotation prevention mechanism.
Since a circular stepped portion 19 having a step in the axial direction with respect to the first sliding surface 17 is provided at the base of the rotary scroll 3, the circular stepped portion 19 has a simple shape that does not reduce the castability of the revolving scroll 3. The stepped portion 19 allows each of the sliding surfaces 17 and 18 to be machined independently, and a cutting tool to be processed on one sliding surface 17 or 18 is prevented from interfering with the other sliding surface 18 or 17. Because there is no machining tool and machining procedure, the machining tool and machining procedure can be selected freely, which makes machining easier.Also, machining one sliding surface does not affect the other sliding surface, so there is no problem with remaining steps. It can be resolved.

[Brief explanation of the drawing]

Fig. 1 is a schematic perspective view of a revolving scroll which is a main part of an embodiment of the present invention, Fig. 2 is a vertical cross-sectional view of the same embodiment, Fig. 3 is a plan sectional view of the same, and Fig. 4 is a same embodiment. FIG. 5 is an explanatory diagram of a conventional example, and FIG. 6 is an explanatory diagram showing the devising process. 2...Fixed scroll, 3...Revolving scroll, 3a...Bearing cylinder, 5...Crankshaft, 5a...
...Eccentric shaft portion, 7...Thrust bearing, 9...Sliding body, 10...Sliding body receiver, 17...First sliding surface, 1
8...Second sliding surface, 19...Circular stepped portion.

Claims (1)

[Scope of utility model registration request] A scroll comprising a fixed scroll 2 and a revolving scroll 3, a rotation prevention mechanism consisting of a sliding body 9 and a sliding body support 10 is provided on the back side of the revolving scroll 3, and the revolving scroll 3 is driven by a crankshaft 5. In the type fluid machine, a first sliding surface 17 is provided on the outer periphery of the back surface of the revolving scroll 3, and the revolving scroll 3 is supported by a thrust bearing 7 that is in sliding contact with the first sliding surface 17. A bearing sleeve 3a for receiving the eccentric shaft portion 5a of the crankshaft 5 is provided in the center of the scroll 3, and the outer circumferential surface of the bearing sleeve 3a is rectangular, and a pair of second sliding surfaces are provided in sliding contact with the sliding body 9. 18, and a circular stepped portion 19 having a step in the axial direction with respect to the first sliding surface 17 is provided at the base of the bearing sleeve 3a.