JPH0735789B2 - Method for manufacturing Oldham coupling for scroll compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial application fields.

The present invention relates to a method of manufacturing an Oldham coupling for a scroll compressor, which orbits a fixed scroll so that the orbiting scroll does not seem to rotate.

(B) Conventional Technology A conventional scroll compressor is constructed, for example, as disclosed in Japanese Patent Laid-Open No. 59-183096. Here, a conventional example will be described with reference to this publication. In FIGS. 19 and 20, 50 is a closed container, a frame 51 is provided in the container, and a scroll compressor unit 52 is provided below the frame.
And a motor section 53 for driving the scroll compressor section 52 is arranged above the frame 51. The scroll compressor section 52 is composed of a fixed scroll 54 and an orbiting scroll 55 arranged above the fixed scroll. The fixed scroll 54 has a disk-shaped end plate 56, an annular wall 57 projecting from the peripheral edge of one surface of the end plate, and a portion surrounded by the annular wall projecting at substantially the same height as the annular wall. And a discharge port 59 provided in the center of the end plate 56, and a suction port 60 provided in the annular wall 57. The fixed scroll 54 has its peripheral edge fixed to the peripheral edge of the frame 51 with the protruding direction of the annular wall 57 and the wrap 58 being upward, and the suction port 60 has the closed container 50.
Also, it is connected to a suction pipe 61 provided so as to penetrate the annular wall 57 in an airtight manner. On the other hand, the orbiting scroll 55 has an end plate 62 having an outer diameter larger than the inner diameter of the annular wall 57, and a spiral shape projecting on one surface of the end plate at a height substantially equal to the height of the wrap 58 of the fixed scroll 54. It is composed of a wrap 63 and a pin portion 64 projecting from the center of the other surface of the end plate 62. The orbiting scroll 55 is mounted such that the wrap 63 and the wrap 63 are in mesh with each other with the protruding direction of the wrap 63 facing downward, and the periphery of the end plate 62 is in sliding contact with the end surface of the annular wall 57. It is held by an Oldham coupling 65 provided between the plate 62 and the frame 51. The Oldham coupling 65 is on the upper surface of the end plate 62, and on both sides of the pin portion 64 as a boundary, fixed on the same line as key pieces 66, 66, and on the lower surface of the frame 51, and Key pieces 67, 67 fixed on a line orthogonal to the arrangement line of the pieces 66, 66, and mounting grooves 68, 68, 6 into which the key pieces are fitted with a minute gap, respectively.
It is composed of a ring body 70 having upper and lower surfaces 9,69.
A bearing hole 71, which is eccentric to the axis of the pin portion 64, is provided in the frame 51 so as to penetrate therethrough in the vertical direction. The bearing hole is formed with a large diameter at the portion located on the pin portion 64 side. The rotating shaft 72 of the electric motor section 53 is rotatably supported in the bearing hole 71. A large diameter portion 73 is formed in a portion of the rotating shaft 72 located in the large diameter portion of the bearing hole 71, and a hole 74 into which the pin portion 64 is fitted is formed in this large diameter portion. A pipe 76 for supplying oil by a pump mechanism 75 is provided above the frame 51.
Are connected.

In the scroll compressor having this structure, the pin portion 64 of the orbiting scroll 55 is fitted into the hole 74 provided in the large diameter portion 73 of the rotating shaft 72, the orbiting scroll is driven by the rotating shaft 72, and the orbital joint 65 is used to orbit the scroll. The rotation of 55 is prevented from rotating with respect to the fixed scroll 54, and the refrigerant is compressed by the fixed scroll and the orbiting scroll.

(C) Problems to be solved by the invention However, the Oldham coupling 65 is formed by fitting the ring body 70 and the key pieces 66, 66, 67, 67 into the mounting grooves 68, 68, 69, 69 of the ring body. Therefore, there is a problem that the number of parts is increased and the productivity is deteriorated. Further, when it is attempted to reduce the number of parts of the Oldham coupling 65, the ring body and the key piece are integrally formed by cutting out by the cutting process, so that the productivity is further deteriorated.

In order to solve the above problems, the present invention forms an Oldham joint by punching so that the key piece is punched inside the ring body at the time of punching so that there is no waste in material removal during punching. The purpose is to improve productivity as well.

(D) Means for Solving the Problems The present invention provides an Oldham coupling that prevents the orbiting scroll from apparently rotating on the fixed scroll, and punches the key piece integrally with the ring body inside the ring body. After that, this key piece is bent toward the outside of the ring body to form an Oldham coupling.

(E) Action The present invention is configured as described above, and the Oldham coupling that prevents the orbiting scroll from apparently rotating on the fixed scroll is integrally formed with the ring body and the key piece inside the ring body. The key piece is punched and bent toward the outside of the ring body to prevent waste of material removal of the Oldham joint and to be easily formed by press working.

(F) Embodiments The present invention will be described below with reference to embodiments shown in FIGS. 1 to 6.

Reference numeral 1 denotes a closed container, which is composed of a cylindrical case 3 to which an electric motor unit 2 is attached, an upper lid 5 attached to a scroll compressor unit 4, and a lower lid 7 having an oil reservoir 6 in which oil is stored. Has been done. A frame 8 fixed to the scroll compressor unit 4 is mounted on the upper end surface of the cylindrical case 3. A bearing portion 10 for supporting the rotating shaft 9 is integrally provided at the center of the frame. Motor part 2 has winding 11
Stator 12 with a built-in housing attached to the inner wall of the cylindrical case 3
And a rotor 13 inserted into the rotating shaft 9 inside the stator. The scroll compressor unit 4 is composed of a fixed scroll 14 and an orbiting scroll 15. The fixed scroll 14 is a disk-shaped end plate that divides the inside of the closed container 1 into upper and lower parts.
16 and an annular wall 17 protruding from the peripheral edge of one surface of the end plate
And a spiral wrap 18 which is surrounded by the annular wall and is erected on the end plate 16 and which is involute or has a curved line approximate to this. End plate 16 of fixed scroll 14
The discharge port 19 is provided in the center of the. The fixed scroll 14 is fixed to the peripheral edge of the frame 8 with bolts 20 with the discharge direction of the annular wall 17 and the wrap 18 directed downward. The orbiting scroll 15 includes an end plate 21 having an outer diameter smaller than the inner diameter of the annular wall 17 of the fixed scroll 14, and a spiral wrap 22 which is erected on one surface of the end plate and has an involute shape or a curve similar to this. And a pin portion 23 protruding from the center of the other surface of the end plate 21.
The orbiting scroll 15 is arranged such that the wrap 22 projects upward and this wrap meshes with the wrap 18 of the fixed scroll 14. Reference numeral 24 denotes a boss hole which is bored at the tip of the rotary shaft 9 and into which the pin portion 23 of the orbiting scroll 15 is inserted. A balance weight 25 is integrally provided on the rotary shaft 9 surrounding the boss hole 24. This balance weight is rotating in the space 26 formed by the frame 8. 27 is an Oldham coupling that revolves the orbiting scroll 15 against the fixed scroll 14 so that it does not seem to rotate. Key pieces 30, 30 slidably inserted in key grooves 29, 29 provided on the same line on both sides of the sandwich
And key pieces 32, 32 slidably inserted in the key grooves 31, 31 provided on the upper surface of the frame 8 and on the line orthogonal to the arrangement line of the key grooves 29, 29. There is. The Oldham coupling 27 is a ring body 28, and key pieces 30 and 30 provided inside the ring body and sliding in the key grooves 29 and 29 of the end plate 21,
The keyways 31, 3 of the frame 8 are provided outside the ring body 28.
The key pieces 32, 32 sliding on 1 are punched integrally from the plate material. And, the key piece 3 punched inside the ring body 28
0 and 30 are formed by bending upward toward the outside of the ring body. 33 is a suction pipe, and this suction pipe is opened in the closed container 1 below the electric element 2. A suction passage 34 for guiding the refrigerant to the scroll compressor section 4 is provided on the outer periphery of the frame 8. 35 is a discharge pipe attached to the upper lid body 5,
This discharge pipe opens into an upper space 36 formed by the upper lid 5 and the end plate 16 of the fixed scroll 14.

In the method of manufacturing an Oldham coupling for a scroll compressor configured as described above, when the electric motor section 2 is rotated, the rotational force is transmitted to the orbiting scroll 15 via the rotary shaft 9. That is, the orbiting scroll 15 has the boss hole 24 of the rotary shaft 9.
Is driven by a pin portion 23 inserted eccentrically with respect to this rotation axis, and key pieces 30, 30, 32, 32 are inserted in the key grooves 29, 29 of the end plate 21 and the key grooves 31, 31 of the frame 8. An Oldham coupling 27 slidably attached to the fixed scroll 14 revolves so that it does not apparently rotate on its axis. Then, the fixed scroll 14 and the orbiting scroll 15 gradually reduce the closed chamber formed by these scrolls from the outside to the inside,
The refrigerant flowing from the suction pipe 33 into the closed casing 1 and passing through the electric motor portion 2 and the suction passage 34 on the outer periphery of the frame 8 is compressed. The compressed refrigerant is discharged from the discharge port 19 of the end plate 16 of the fixed scroll 14 to the upper space 36, and is discharged from the discharge pipe 35 to the outside of the closed container 1.

The Oldham coupling 27 for preventing rotation of the orbiting scroll 15 is a ring body 28 for the key pieces 30, 30 sliding in the key grooves 29, 29 of the end plate 21.
The inner side of this is punched integrally with this ring body to prevent waste of material removal. Further, the key pieces 30, 30 punched out inside the ring body 28 are bent toward the outside of the ring body so that the height difference with the key pieces 32, 32 sliding in the key grooves 31, 31 of the frame 8. The orbiting scroll 15 is revolved around the upper surface of the frame 8.

In the above description, only the key pieces 30, 30 are the ring body 2.
Although it was explained that the punching is done inside the 8, the key pieces 37, 37, 38, 38 which are inserted into the key groove of the end plate and the key groove of the frame are all ringed as shown in FIGS. It goes without saying that it may be formed by punching inside the body 39 and bending the punched key piece. Further, it goes without saying that the key pieces 40, 40, 41, 41 may be displaced from the same line as shown in FIGS. 11 to 18.

(G) Effect of the Invention According to the method for manufacturing an Oldham coupling for a scroll compressor of the present invention, an Oldham coupling that prevents the orbiting scroll from apparently rotating on the fixed scroll is provided, and is integrated with the ring body inside the ring body. After punching the key piece, the key piece provided on the inside is bent toward the outside of the ring body to form the Oldham's joint, so that the following effects are obtained.

 The Oldham joint can be formed by pressing.

Since the key piece is integrally punched inside the ring body, waste of material removal can be prevented.

By simply bending the key pieces outward, the height difference of the key pieces inserted into the key grooves of separate parts can be obtained.

[Brief description of drawings]

1 to 6 show the present invention, FIG. 1 is a longitudinal sectional view of a scroll compressor, FIG. 2 is an exploded perspective view of a scroll compressor portion, and FIG. 3 is an Oldham coupling immediately after being punched. A plan view, FIG. 4 is a side view of the same, FIG. 5 is a plan view of a bent Oldham coupling, FIG. 6 is a side view of the same, and FIGS. 7 to 10 show other embodiments of the Oldham coupling. , FIG. 7 is a plan view of the Oldham joint immediately after punching, FIG. 8 is a side view of the same, FIG. 9 is a plan view of a bent Oldham joint, and FIG. 10 is a side view of the same, and FIGS. FIG. 14 shows another embodiment of the Oldham joint, FIG. 11 is a plan view of the Oldham joint immediately after being punched, and FIG. 12 is a side view of the same.
Fig. 13 is a plan view of a bent Oldham coupling, Fig. 14
The same figure is a side view, FIGS. 15 to 18 show another embodiment of the Oldham coupling, FIG. 15 is a plan view of the Oldham coupling immediately after punching, FIG. 16 is a side view, and FIG. Is a plan view of a bent Oldham coupling, FIG. 18 is a side view of the same, FIGS. 19 and 20 show a conventional example, FIG. 19 is a vertical sectional view of a scroll compressor, and FIG. 20 is an Oldham coupling. FIG. 1 ... Airtight container, 2 ... Electric motor part, 4 ... Scroll compressor part, 8 ... Frame, 14 ... Fixed scroll, 15 ... Orbiting scroll, 16,21 ... End plate, 18,22 ... Wrap, 27 ... Oldham coupling, 28 … Ring body, 29, 29, 31, 31… Keyway, 30, 30, 32, 32
… A key piece.

Claims (1)

[Claims] 1. A fixed scroll in which a frame, a compressor section and an electric motor section arranged on both sides of the frame are housed in an airtight container, and an involute wrap is erected on the compressor section as an end plate. And an orbiting scroll formed by erected an involute wrap on the end plate that faces and engages with the fixed scroll, and an Oldham coupling is provided to prevent the orbiting scroll from apparently rotating with respect to the fixed scroll. This Oldham joint is a ring body,
In an Oldham coupling for a scroll compressor, which is integrally provided on the ring body and is constituted by an end plate of an orbiting scroll and a key piece attached to a key groove provided on a frame,
The Oldham coupling is formed by punching a key piece integrally with the ring body inside the ring body and then bending the key piece toward the outside of the ring body. Manufacturing method.