JPH01305188A - Cylinder of rotary compressor - Google Patents

Abstract

PURPOSE:To make it possible to machine a high accuracy vane sliding groove with a simple machine by opening the vane sliding grove also on the outside surface of a cylinder and mounting a groove cover on the outside surface. CONSTITUTION:With the side facing to the vane sliding groove 9 of a cylinder main body 23 fixed by a work fixing member 26, the vane sliding groove 9 is machined with a groove milling cutter 27. Then both surfaces of the vane sliding groove 9 is ground with disk type grinding stone, thereby obtaining the vane sliding groove with high accuracy. The outer end part of the vane sliding groove 9 is covered with a groove cover 24. Thus, it is possible to simply machine the vane sliding groove with a small sized machine so as to reduce a cost in equipment and operational cost. Further, improvement in accuracy of the groove 9 makes it possible to enhance the compression efficiency and wear resistance.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) The present invention relates to a cylinder for a rotary compressor.

(Prior Art) Figures 6 and 7 show one side of a rotary compressor commonly used for air conditioners, etc. In the lower part of the inside of a cylindrical casing 1 with a bottom, there is a circle in the center. A cylinder 2 having a shaped cylinder chamber 2a, a main bearing 3 fixed to the upper surface side of the cylinder 2, and a sub bearing 4 fixed to the lower surface side of the cylinder 2 are disposed.

Inside the cylinder chamber a of the cylinder 2 is a shaft 5.
A crank portion 5a formed eccentrically is arranged, and a roller 6 is fitted into this crank portion 5a. Also,
The main shaft part 5b above the crank part 5a of the shaft 5 is rotatably supported by the main bearing 3, and the counter shaft part 5C below the crank part 5a is rotatably supported by the sub bearing 4. . Furthermore, on the outer peripheral wall of the cylinder 2,
As shown in FIG. 6, a vane sliding groove 9 is provided with one end opening into the cylinder chamber 2a and extending in the radial direction, and the vane 7 is slidably mounted in this vane Jfj moving groove 9. The tip of the vane 7 is pressed against the roller 6 by a spring 8.

And, by this vane 7, the suction chamber 10 and the discharge chamber 1
1 is separated. This suction chamber 101; is the suction pipe 1
2, each discharge chamber 11 is provided with a discharge hole 14 having a discharge valve 13. Further, a rotor 15 of the motor is attached to the upper portion of the crank portion 5a of the shaft 5, and the rotor 15 is disposed inside a stator 16 attached inside the casing 1. Furthermore, - the upper part of the casing 1 is provided with an upper lid 17, and this upper lid 17 is provided with a discharge pipe 18.

Therefore, when the volume inside the suction chamber 10 increases due to the eccentric rotation of the roller 6 as the shaft 5 rotates,
As a result, suction gas is sucked in from the suction pipe 12. When this suction process is completed, the gas is further compressed by the eccentric rotation of the roller 6. Then, this compressed gas passes through the discharge hole 14 and the discharge valve 13 into the casing 1.
It is discharged into the interior and further sent to the outside via the discharge pipe 18.

By the way, in the above-mentioned rotary compressor, the vane sliding groove 9 does not open to the outer circumference of the cylinder 2. Further, the width of the vane sliding groove 9 must be such that the gap with the vane 7 is minimized and uniform in order to reduce compression leakage during compression. Furthermore, since the vane 7 is subjected to a pressure difference between the suction chamber 10 and the discharge chamber 11, the shape accuracy (parallelism, flatness, roughness, etc.) of the vane sliding groove 9 is required to ensure wear resistance, smoothness, and airtightness. etc., it is necessary to finish with high precision.

Therefore, the vane sliding groove 9 has conventionally been formed by broaching as shown in FIGS. 8 and 9. Reference numeral 19 in the figure is a cylindrical broach holder, and grooves 19a cut in the radial direction are provided at several locations on the outer circumference of one broach holder so that the grooves 19a are straight in the axial direction. A broach blade 20 having a portion 20a is fixed by a screw 21 with the protrusion 20a engaged in the groove 19a. This broach blade 20 has a tapered portion extending in the axial direction of the broach holder 19, and this taper portion is provided with a cutting edge 20b. Also,
The upper part of this broach blade 20 has a finishing file part 2.
It has 0c.

Thus, the workpiece holder of the broaching machine 22 is placed and fixed on the cylinder 2 on the upper part of the jig 22a, and the above-mentioned broach is inserted into the circular hole of the cylinder 2.

At this time, the broach blade 20 is installed at a location where the vane sliding groove 9 is provided. Therefore, by pulling the broach holder 19 downward, the cutting edge 20b of the broach blade 20 cuts the groove, and the file portion 20c finishes the inside of the vane sliding groove 9.

(Problem to be Solved by the Invention) However, when cutting grooves in the vane sliding groove of the cylinder, the only method available is to insert a processing jig into the circular hole of the cylinder, so it is difficult to use processing methods such as broaching. Due to the restrictions, processing equipment for this purpose becomes large-scale and expensive equipment. In addition, due to cutting edge wear and deformation of the workpiece, machining accuracy is lower than that achieved with grinding, which results in problems such as large compression leakage losses and reduced wear resistance. There is.

The present invention was made in view of the above-mentioned problems.
It is an object of the present invention to provide a cylinder whose vane sliding grooves can be machined with high precision and with a simple processing device.

[Structure of the invention]

(Means for Solving the Problems) The present invention provides a rotary compressor having a circular cylinder chamber in the center and a vane sliding groove extending in the radial direction opening into the cylinder chamber in the peripheral wall. In the cylinder,
The vane sliding groove is also opened on the outer surface of the cylinder, and a groove cover is attached to the outer surface of the cylinder. and a groove block with a groove formed therein, and the groove block is fixed to one side of the cylinder body so that the vane sliding groove thereof opens into the cylinder chamber, or the cylinder is formed on a plane including the vane sliding groove. It is characterized in that it is divided by a plane that intersects the two, and the two are connected to each other at the dividing plane.

(Function) In a rotary compressor cylinder having a circular cylinder chamber in the center and a vane sliding groove extending in the radial direction opening into the cylinder chamber in the peripheral wall, the cylinder is configured as described above. In this way, the vane sliding groove can first be formed as a groove that opens outward. Machining of vane sliding grooves can be done easily and with small-scale equipment, reducing equipment costs.
Operating costs etc. will be reduced. Moreover, since a processing jig with good processing accuracy can be used when processing the vane sliding groove, processing accuracy is improved, and therefore compression efficiency and wear resistance can be improved.

(Example) Hereinafter, an example of the present invention will be described with reference to the accompanying drawings.

Here, the compressor according to the present invention has a configuration similar to that shown in FIG. 6, and detailed explanation thereof will be omitted.

1(a) and 1(b) are a plan view and a side view of the cylinder 2 according to the present invention, in which a circular cylinder chamber 23a is formed in the center of the cylinder body 23, and the cylinder chamber 23a is A vane sliding groove 9 that is open to the outer surface and the outer surface of the vane is provided. Further, in the vicinity of the vane sliding groove 9 of the cylinder body 23, a bolt hole 23b whose axis is parallel to the direction of the groove is bored in the outer surface of the cylinder body 23. A groove cover 24 having a bolt hole 24a that can be aligned with this bolt hole 23b is attached to the cylinder body 23 with bolts 25.

Further, the bolt hole 24a is provided with a stepped portion as shown in FIG. 1(a) so that the bolt head of the bolt 25 is embedded when the bolt 25 is fastened.

Vane sliding groove 9 of cylinder 2 having such a structure
In the case of processing, a processing method as shown in FIG. 2 can be adopted.

This is done by fixing the side of the cylinder body 23 facing the vane sliding groove 9 with a work fixing member 26, and using a groove milling cutter 27 to process the vane sliding groove 9. Thereafter, by grinding both sides of the vane sliding groove 9 using a disc-shaped grindstone, a highly accurate vane sliding groove 9 can be obtained. The outer end of the vane sliding groove 9 is closed by the groove cover 24.

Therefore, processing of the vane sliding groove 9 can be carried out easily and with a small-scale device, and device costs, operating costs, etc. are reduced. Furthermore, if the accuracy of the vane sliding groove 9 is improved, the compression efficiency and wear resistance of the compressor will also be improved.

FIGS. 3(a) and 3(b) are a plan view and a side view of a cylinder in another embodiment of the present invention. This is bolt hole 2
The axial direction of the groove 3b is perpendicular to the groove direction, and the cylinder body 23 is bored in the upper and lower surfaces thereof. Further, a groove cover 24b that is aligned with the bolt hole 23b on the upper surface and covers the vane sliding groove 9, and a groove cover 24c that is aligned with the bolt hole 23b on the lower surface and covers the vane sliding groove 9 are bolted together. 25 to be fixed to the cylinder body 23.

In addition, in the case where the axial direction of the bolt hole 23b is set perpendicular to the groove direction, the cylinder 2 can be installed by drilling bolt holes in the main bearing and the sub-bearing without providing the groove cover 24. It may be directly fixed to the main bearing and the sub-bearing.

FIGS. 4(a) and 4(b) are a plan view and a side view of a cylinder in another embodiment of the present invention. In the figure, a cylinder chamber 28a is formed in the central part, and the reference numeral 28 denotes a cylinder chamber 28a.
An opening 2 for communicating with the vane sliding groove 9 in a part of a.
8b is a cylinder body formed on the outer surface. A connecting surface 28c is formed at a portion of the cylinder body 28 having the opening 28b. Further, bolt holes 28d are bored in this connecting surface 28c. On the other hand, a groove block 29 having a connecting surface 29a connected to the connecting surface 28c of the cylinder body 28 and forming a vane sliding groove 9 with one end in the vane sliding direction opening to the outside is attached to the cylinder body 28 with the bolt 3.
0 so that the vane sliding groove 9 of the groove block opens into the cylinder chamber.

FIGS. 4(a) and 4(b) are a plan view and a side view of a cylinder in another embodiment of the present invention. The cylinder 2 is divided along a plane that intersects the plane containing the vane sliding groove 9, and these are respectively referred to as a first cylinder member 31 and a second cylinder member 32. This first cylinder member 31 is provided with a flange portion 31a that includes this dividing surface, and furthermore, bolt holes 31b are bored in this flange portion 31a. Similarly, the second cylinder member 32 is also provided with a flange portion 32a including a dividing surface, and furthermore, bolt holes 32b are bored in this flange portion 32a.

Thus, the bolt holes 31b drilled in the flange portion 31a of the first cylinder member 31 and the bolt holes 32b drilled in the flange portion 32g of the second cylinder member 32 are aligned, and these bolt holes 31b1 bolt holes 32b are aligned. By fastening the bolt 33, the first cylinder member 31 and the second cylinder member 32 are connected.

In addition, in the other embodiments shown in FIGS. 3 to 5 described above, it is sufficient to form a groove that opens to the outside, and the vane sliding groove 9 can be formed with precision using the same processing method as in the first embodiment. It can be processed well.

〔Effect of the invention〕

Since the present invention is configured as described above, when forming a vane sliding groove in the cylinder, the vane sliding groove can be formed by first forming a groove that opens to the outside. can be easily processed using small-scale equipment, reducing equipment costs, operating costs, etc. In addition, when machining the vane sliding groove, it is possible to use a machining jig with high machining accuracy, which improves machining accuracy, which has the effect of improving compression efficiency and wear resistance. play.

[Brief explanation of the drawing]

FIG. 1(a) is a plan view of one embodiment of the present invention.
Figure (b) is a side view of one embodiment of the present invention, Figure 2 is an explanatory diagram of processing the vane sliding groove in the present invention, and Figure 3 (
a) is a plan view of another embodiment of the present invention, and FIG. 3(b) is a plan view of another embodiment of the present invention.
) is a side view of another embodiment of the present invention, FIG. 4(a)
is a plan view of another embodiment of the present invention, FIG. 4(b) is a side view of another embodiment of the present invention, and FIG. 5(a) is a plan view of another embodiment of the present invention. Figure (b) is a side view of another embodiment of the present invention, Figure 6 is a vertical sectional view of the compressor, Figure 7 is a view taken along the IT arrow in Figure 6, and Figure 8 is a conventional vane slide. FIG. 9 is a top view of FIG. 8, which is an explanatory drawing for processing the dynamic groove. DESCRIPTION OF SYMBOLS 1... Casing, 2... Cylinder, 3... Main bearing, 4... Sub bearing, 5... Shaft, 5a... Crank part, 5b... Main shaft part, 5C... Subshaft part, 6.
...Roller, 7...Vane, 8...Spring, 9...
Vane sliding groove, 10... Suction chamber, 11... Discharge chamber, 12... Suction pipe, 13... Discharge valve, 14... Discharge hole, 15... Rotor, 16... Stator, 17.
...Top lid, 18...Discharge pipe, 19...Broach holder, 1.9 a...Groove, 20...Broach blade, 20
a... Projection, 20b... Cutting blade, 20e... File part, 21... Screw, 22... Broaching machine, 22a...
... Workpiece holder is jig, 23... Cylinder body, 23a
...Cylinder chamber, 23b...Bolt hole, 24...
Groove cover, 24a... Bolt hole, 24b... Groove cover, 24c... Groove cover, 25... Bolt,
26... Warr fixing member, 27... Groove milling cutter,
28... Cylinder body, 28a... Cylinder chamber, 2
8b...opening, 28c...connection surface, 28d...
Bolt hole, 29... Groove block, 29a... Connection surface, 30... Bolt, 31... First cylinder member, 3
1a...flange part, 31b...bolt hole, 32.
...Second cylinder member, 32a...Flange portion, 32
b...Bolt hole, 33...Bolt. Applicant's agent Sato -Yuth f Figure 2 Figure 2 (CL) C4) Kao 3 Kamome 4 Eye (α) (6) Hand 5 Figure 6 Figure Hanging 7 Figure

Claims (1)

[Claims] 1. A rotary compressor cylinder having a circular cylinder chamber in the center and a vane sliding groove extending in the radial direction opening into the cylinder chamber in the peripheral wall, wherein the vane A cylinder for a rotary compressor, characterized in that a sliding groove is also opened on the outer surface of the cylinder, and a groove cover is attached to the outer surface. 2. In a rotary compressor cylinder having a circular cylinder chamber in the center and a radially extending vane sliding groove opening into the cylinder chamber in the peripheral wall, the cylinder is a cylinder body having the cylinder chamber. and a groove block having a vane sliding groove whose one end in the vane sliding direction opens to the outside, and the groove block is fixed to one side of the cylinder body so that the vane sliding groove opens into the cylinder chamber. A rotary compressor cylinder characterized by: 3. A rotary compressor cylinder having a circular cylinder chamber in the center and a vane sliding groove extending in the radial direction opening into the cylinder chamber in the peripheral wall, the cylinder including the vane sliding groove. A cylinder for a rotary compressor, characterized in that the cylinder is divided by a plane that intersects the plane, and both parts are connected to each other at the dividing plane.