JPS60101289A - Cylinder for rotary compressor and its processing method - Google Patents

Abstract

PURPOSE:To work a vane groove easily with high accuracy by tapering the opposite outside faces of vane groove while utilizing a working jig provided with chips or deformation suppressing bodies having corresponding tapered face. CONSTITUTION:The opposite outside faces 11, 11' of vane groove 9 in cylinder for rotary compressor are tapered. Resilient deformation is suppressed by a working jig provided with deformation suppressing bodies or chips 14, 14' having corresponding taper. Consequently, a vane groove 9 can be broach worked easily with high accuracy by means of said working jig without employing a pressing chip which will require conventional large scale pressure holding device. As a result, material is not piled after working thus to eliminate process for removing the piled portion.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a cylinder for a rotary consolenometer, in which a vane groove having two parallel and opposing side walls is bored in the inner circumferential surface thereof, and its processing. In particular, the present invention relates to a cylinder for a rotary compressor, in which the vane grooves can be easily machined to a roughness of 1 j degree, and a processing method thereof.

[Background of the invention]

First, a conventional cylinder for a rotary compressor will be explained.

FIG. 1 is a side view showing an example of a cylinder for a conventional rotary compressor, and FIG. 2 is a plan view showing an example of a cylinder of a conventional rotary compressor.

In FIG. 1, reference numeral 1 denotes a cylinder for a rotary compressor, in which a vane groove 2 having two parallel and opposing side walls is bored in its inner circumferential surface. tl+-
A bevel 76 is slidably inserted into the cylinder 2 and reciprocates within the cylinder while coming into contact with the roller 5 that rotates eccentrically. In addition, 3 is a crankshaft that rotates the roller 5 by 15 degrees, 4 is a coil spring that applies force from behind the vane 6, 7 is the case of the rotary compressor, and in FIG. is a vane groove 9 having two mutually parallel and opposing side walls on its inner peripheral surface.
This is a rotary compressor cylinder with a
Reference numeral 10 denotes an intake port provided in the cylinder 8 for the rotary compressor. Although not shown in the drawings, this cylinder 8 for the rotary compressor does not use a coil spring to press the horn from the rear, but has a loop shape (one end is fixed to the 7-ring body and the other end is pressed). It was designed to be attached.

For conventional rotary compressor printers, 8, when broaching the vane groove 2.9 by passing the broach in a direction perpendicular to the surface of the paper, cutting resistance causes the vane groove to move in a direction perpendicular to the cutting surface. There was a problem in that the vane (1) was elastically deformed and good processing accuracy could not be obtained.

Conventionally, as a means to prevent the elastic deformation and improve the machining accuracy of the vane groove, for example, a cylinder for a rotary compressor is clamped between a pair of bases, and the vicinity of both sides of the vane groove is compressed in the base pinching direction. It is known that a presser is pushed in the direction in which the broach is to be passed through and the broach is plastically deformed.

However, according to such conventional means, in order to push the presser, not only is it necessary to use a dog-like clamping device that generates a large force, but also the press is applied to the upper and lower surfaces of the cylinder for the rotary compressor. This has the disadvantage that the top and bottom surfaces of the rotary compressor cylinder must be reworked in the subsequent process, which increases the number of man-hours required for machining.
It was evident that the vane groove could be processed easily and with high precision.

[Purpose of the invention]

An object of the present invention is to provide a cylinder for a rotary compressor and a method for processing the same, which eliminates the drawbacks of the prior art described above and allows easy processing of vane grooves with high precision. be.

[Summary of the invention]

The structure of the cylinder for a rotary compressor according to the present invention is such that a vane groove having two parallel and opposing side walls is bored in the inner circumferential surface, and a vane is slidably fitted into the vane groove. In a cylinder for a rotary compressor that slides back and forth while contacting a roller that rotates eccentrically inside the cylinder, both rows of side surfaces sandwiching a vane groove are formed in a tapered shape or parallel to the center line of the vane groove, and the vane The grooves are finished.

Further, the structure of the processing method of the cylinder for a rotary compressor according to the present invention is such that a vane groove having two parallel and opposing side walls is bored in the inner circumferential surface, and the cylinder can be slid freely in the vane groove. In the processing method for a cylinder for a rotary compressor, in which vanes inserted into the cylinder reciprocate while contacting a roller that rotates eccentrically inside the cylinder, both rows of side surfaces that sandwich the vane groove are tapered with respect to the center line of the vane groove. A pre-processed product of a rotary compressor cylinder formed in a shape or parallel to each other is attached to a processing jig fixed to a base with a holder formed in a taper or parallel to the taper on the side surfaces of both rows, and the vane groove is The broaching process is performed by passing the broach vertically through the cylinder surface.

[Embodiments of the invention]

The present invention will be explained below using examples.

FIG. 3 is a plan view showing a first embodiment of the rotary compressor cylinder of the present invention.

In FIG. 3, 8A has circular outer side surfaces 11 and 11' that sandwich the vane groove 9 in a substantially symmetrical position with the vane groove center line 12 as the axis of symmetry, and is perpendicular to the cylinder surface 13 in a tapered (outer circular) shape. This cylinder for a rotary compressor is made of a sintered alloy and is formed at the same angle between the side surface 11.11' and the center line of the vane groove.

Cylinder 8 for a rotary compressor configured as shown in
The effect of A will be described later together with the effect of the first example of the processing method described below.

FIG. 4 is a diagram for explaining the first embodiment of the method of machining a cylinder for a rotary compressor according to the present invention, and shows the state in which the cylinder for a rotary compressor according to FIG. 3 is being machined. FIG.

In FIG. 4, the same parts as in FIG. 3 are denoted by the same numbers. and 14.14' is the circular outer surface 11
．． These tapers 414 and 14' are connected to a seat for fixing the rotary compressor cylinder and a hole through which the broach 16 passes (both are not shown). ) is fixed to the base 215 having a hole therein, and the taper shaft 14°1
4' and the base 15 constitute a processing jig.

A pre-processed product 8A' of a cylinder for a rotary compressor made of a sintered alloy (the one in Fig. 3, in which the vane groove 9 has not been finished) is added to the processing jig constructed in this way.
If the broach 16 is passed in the direction of the arrow 17 and the broach is processed, the elastic deformation of the vane groove becomes the taper piece 14.
, 14', and a rotary compressor cylinder 8A shown in FIG. 3 is obtained, in which a vane groove 9 having a desired precision is machined.

According to the embodiment described above, there are the following effects.

■The circular outer surface 1.1.11' sandwiching the vane groove 9 of the rotary compressor cylinder is formed into a tapered shape, and the taper pieces 14, 14', which are deformation suppressing bodies, have a taper that matches the taper of the rotary compressor cylinder. Since the elastic deformation is suppressed by the provided processing jig, the processing jig can be simply used without using a presser that requires a conventional dog clamping device. The vane groove 9- can be easily broached with high precision using only a chisel.

■It is extremely easy to attach and remove the sill for the rotary compressor from the processing jig.

■Since it is not necessary to attach several pressers to the cylinder for the rotary compressor, as was conventionally used, there will be no build-up of the material after broaching, and therefore, there will be no need to remove the raised portions. This eliminates the need for post-processing.

(2) The effects of (1) to (3) described above have the effect of simplifying the machining equipment for rotary compressor cylinders and reducing the number of machining steps.

■Since the inner and outer surfaces 11 and 11' are formed into a tapered shape,
As will be explained later in the embodiment shown in FIG. 5, it is possible to machine the vane groove 9 with a constant vane groove width even if the broach is worn out, and as will be explained in the embodiment shown in FIG. 6 below. This also has the effect of stabilizing broaching.

FIG. 5 is a diagram illustrating a second embodiment of the method of manufacturing a cylinder for a rotary recompressor according to the present invention, in which the cylinder for a rotary compressor according to the above-mentioned FIG. 3 is obtained. FIG. 2 is a perspective view of the main parts showing the state (however, the broach is not shown).

In FIG. 5, the same parts as in FIG. 4 are denoted by the same numbers. 18 is a push plate for applying a predetermined pressing force 21 in the direction of the vane groove from the direction facing the vane groove 9; 20 and 20' are both fixed to the base 15; This is a push plate guide that guides the push plate 18.

A pre-processed product 8A'wo-L-' of a cylinder for a rotary compressor made of a sintered alloy is attached to the processing jig constructed in this way.
The pressing plate 18 applies a force 21 to a predetermined pressing force, and the pressing force 21 is maintained by the tops 14 and 14'. At this time, the pre-processed product 8A' of the rotary compressor cylinder has outer surfaces 11, 11. ' is pushed and deformed, and the groove width 9a of the vane groove 9 becomes 2 more than the free state.
It is reduced by Δ (where Δ is the displacement amount on one side of the vane groove) and becomes narrower.

In this state, if broaching is performed through a broach (not shown) with a tool width B, the elastic deformation of the vane groove is suppressed by the Taber pieces 14, 14', and the groove width 9a is changed to the tool width B.
A vane groove 9 equal to 1 is machined. Then, the pressing force 21 is removed and the rotary compressor cylinder 8
When A is removed from the machining jig, the deformation caused by the pressing force 21 is recovered, and a rotary compressor cylinder 8A having a vane groove 9 having a groove width 9a of B+2Δ is obtained.

According to the second embodiment of the method for processing a cylinder for a rotary compressor described above, the rigidity of the cylinder for a rotary compressor is set in advance, and the pressing is performed by adjusting the magnitude of the force 21 appropriately. After setting in the jig, the reduction amount 2Δ of the groove width 9a of the vane groove 9 can be set to an arbitrary value. By bending the pre-processed product of the compressor cylinder to reduce the groove width 9a, there is an effect unique to this embodiment in that the vane groove 9 can be machined so that the groove width 9a is always constant.

FIG. 6 is a diagram for explaining a third embodiment of the method of manufacturing a cylinder for a rotary compressor according to the present invention, and shows the process for obtaining the cylinder for a rotary compressor according to FIG. FIG.

In FIG. 6, the same parts as those in FIG. 4 are denoted by the same numbers. 16A is a broach whose cutting edge 16a is inclined with respect to the longitudinal direction of the broach.

If the broach 16A configured in this manner is passed in the direction of arrow '22, broaching will be performed from the inside to the outside of the vane groove 9. An extrusion force acts, and this force pushes the pre-processed product 8A' of the cylinder for the rotary compressor into the tapered top 14. ．． 14' can be raided, so
This method has the advantage that extremely stable broaching can be performed.

The eight rotary compressor cylinders were arranged so that the outer surfaces 11.11' were located at approximately symmetrical positions with respect to the vane groove center line 12, but they do not necessarily have to be at symmetrical positions, and may be slightly symmetrical in the groove width direction. It may be biased toward

Furthermore, the outer surface 11, 1.1. ” is the vane groove center line 1
The angles formed by 2 and 2 are made the same, but the angles do not necessarily have to be the same; they just need to be wedge-shaped.

FIG. 7 is a plan view showing a second embodiment of the rotary compressor cylinder of the present invention.

In FIG. 7, 8B is a rotary compressor cylinder in which outer surfaces 11A and 11'A sandwiching the vane groove 9 are formed parallel to the vane groove center line 12.

Cylinder 8 for rotary compressor configured in this way
The effect of B is that the outer surface 11A can be easily compressed without using a presser that requires a larger pressing device than the conventional one.
, 11'A, the elastic deformation of the vane groove can be suppressed by simply using a machining jig (not shown) equipped with parallel and slanted edges, and the vane groove 9 can be easily machined with high precision. This is something that can be done. Still outer surface 11A.

Since 11' and 8 are parallel, there is an advantage that it is easier to form than the tapered outer surface 11.11' of the rotary compressor cylinder 8A shown in FIG. 3.

〔Effect of the invention〕

As explained in detail above, according to the present invention, it is possible to provide a cylinder for a rotary compressor in which vane grooves can be easily processed with high precision, and a processing method thereof.

[Brief explanation of the drawing]

FIG. 1 is a plan view showing an example of a conventional cylinder for a rotary compressor, FIG. 2 is a plan view showing another example of a conventional cylinder for a rotary compressor, and FIG. 3 is a plan view of a cylinder for a rotary compressor according to the present invention. Processing methods 1 and 2
．． FIG. 7 is a perspective view of a main part showing a state in which the rotary compressor cylinder according to FIG. 3 is being processed, and FIG. It is a top view which shows the 2nd Example of the cylinder for rotary compressors. 5... Roller, 6... Vane, 8A, 8B... Cylinder for rotary compressor, 8A'... Pre-processed product of cylinder for rotary compressor, 9... Vane groove, 11, . 11', 11. A, 11' A... Outer surface, 12... Vane groove center line, 13... Cylinder surface, 14°14'... Taper top, 15... Pace, 1
6.16A...Broach, 18...Press plate, 21...
Pushing is force. Agent: Patent attorney Kosaku Fukuda (and 1 other person) Country I, 2nd office, 3rd quarter, 4th day! 5th day 6th concave figure 7

Claims (1)

[Claims] 1. On the inner circumferential surface, facing each other in the IL row 2■1
A rotary compressor in which a vane groove with a wall is bored, and the vane is slidably fitted into the vane groove and slides back and forth while contacting a roller that rotates eccentrically within the IJ interface. A loaf characterized in that, in a printer for use, an external ψ surface sandwiching a vane groove is formed in a tapered shape or parallel to the G line in the vane groove, and the vane groove is finished and processed. Cylinder for 1 saw/Gretusa. 2. A vane groove having two parallel and opposing side walls is bored in the inner peripheral surface, and the vane, which is slidably fitted into the vane groove, rotates eccentrically within the cylinder. In the processing method for rotary compressor cylinders that slide back and forth while in contact with rollers, the cylinder for rotary compressors has the outer surface that sandwiches the vane groove formed in a rectangular shape or parallel to the center line of the vane groove. Attach the pre-processed product to a processing jig fixed to the base with a holder formed with a taper that matches or parallel to the taper of the outer side surface, and pass a broach through the 7 grooves in the cylinder surface in a direction perpendicular to the cylinder surface. A method of machining cylinders for rotary compressors, which is characterized by broaching. 3. A pre-processed product of a cylinder for a rotary compressor, in which the outer surface of the surface sandwiching the vane groove is formed in a tapered shape with respect to the center line of the vane groove, is pressed in a predetermined direction from the direction facing the vane groove to the direction of the vane groove. Claim 2: While applying force, the vane groove is broached while the pressing force is maintained using a holder having a taper that matches the taper of the outer side surface. Machining method for cylinders for rotary compressors described.