JP3061469B2 - Scroll type compressor - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor.

[0002]

2. Description of the Related Art A scroll type compressor combines two spirally machined blades (a fixed scroll and a swirling scroll) and compresses a gas by their relative motion.

That is, the fixed scroll is fixed to a frame provided in a closed case, and the upper end of a crankshaft of a motor also provided in the closed case. Attach swivel scroll.

By operating the motor, the center of the turning scroll is rotated at a constant radius around the center of the fixed scroll without rotating the turning scroll. The fixed scroll and the revolving scroll revolve.

As a result, the crescent-shaped working chamber formed by the fixed scroll and the swirling scroll moves from the outer periphery to the center while rotating to compress the gas. The compressed gas is discharged to the outside from a discharge port formed at the center of the fixed scroll.

In the above-mentioned scroll type compressor, generally, as a means for preventing the rotating scroll from rotating, the rotating scroll and the frame are connected by an Oldham mechanism.

That is, a key groove is provided on the lower surface of the revolving scroll and the upper surface of the frame so as to be shifted by 180 degrees in the circumferential direction and along the radial direction of the rotating shaft. Then, an Oldham ring 1 shown in FIG. 4A is inserted between the lower surface of the revolving scroll and the upper surface of the frame.

The Oldham ring 1 is provided with a pair of first and second key portions 3 and 4 on the upper and lower surfaces of an annular ring main body 2, respectively. A pair of first key portions 3 provided on the upper surface and a pair of second key portions 4 provided on the lower surface are orthogonal to each other.

As shown in an enlarged view in FIG. 4B, the first (second) key portion 3 is connected to the ring main body 2 by a connecting pin 5.
Is fixed by That is, the coupling pin 5 has one end fitted into the first coupling hole 2 a provided in the ring main body 2 and the other end opened to the lower surface of the first key portion 3. 3a.

In the Oldham ring 1 thus formed, the first key portion 3 provided on the upper surface side is inserted into a key groove provided on the lower surface of the turning scroll, and provided on the lower surface side. The obtained second key portion 4 is inserted into a key groove provided on the upper surface of the frame. Thus, the frame, the Oldham ring 1 and the turning scroll constitute an Oldham mechanism. Even if the center of the turning scroll rotates around the center of the fixed scroll, the turning scroll does not change. The frame keeps the same phase as the frame (fixed to the closed case) and does not rotate.

[0011]

In order to reduce the weight and reduce the vibration of the Oldham ring, the first and second keys 3, 4 are made of a hard material having excellent wear resistance. The ring body 2 employs lightweight aluminum or the like.

In such an Oldham ring 1, when a rotational force is applied to the first and second keys 3, 4, the connecting pin 5 is moved to the first and second keys 3, 4. , 4
At the same time, it tries to rotate in the first coupling hole 2a of the ring main body 2. In such a state, the Oldham ring 1
Since the ring body 2 is relatively soft aluminum material, the connection with the connecting pin is loosened, and the first and second keys 3, 4 are moved together with the connecting pin 5 from the ring body 2. It may come off and damage the scroll compressor.

The present invention has been made in view of such circumstances, and has as its object to provide a scroll type compressor which can effectively prevent the key portion from coming off the Oldham ring. is there.

[0014]

SUMMARY OF THE INVENTION The present invention comprises a frame to which a fixed scroll is fixed, an orbiting scroll provided through a compression space with respect to the fixed scroll, and a solid ring attached to an annular body by a connecting pin. And a key portion provided on the frame or the fixed scroll and a key groove provided on the orbiting scroll are slidably engaged with the key portion to restrict the rotation of the orbiting scroll. A scroll type compressor having an Oldham ring, wherein a key mounting portion of the annular body is provided.
Provided with a keyway, the coupling pin scroll type compressor, characterized in that one end of the cross-sectional shape that is attached to the torus is formed in a noncircular shape.

[0015]

According to this structure, the connecting pin for connecting the key portion and the ring is less likely to rotate in the ring even when a rotational force is applied.

[0016]

An embodiment of the present invention will be described below with reference to the drawings. Note that the same components as those in the conventional example are denoted by the same reference numerals, and description thereof will be omitted. The scroll type compressor 10 of the present invention shown in FIG. 1 has basically the same configuration as that of the conventional example, and reference numeral 11 in the figure denotes a closed case.

A fixed plate 12 is provided in the sealed case 11, and a compression mechanism 14 and a frame 15 are fixed to the fixed plate 12 by bolts 13. Also,
A motor 16 is provided on the lower surface of the frame 15. The motor 16 has a stator 17 fixed to the frame 15, a rotor 18 rotatably inserted into the stator 17, a lower end fitted and supported by the rotor 18, and an upper end thereof. And a crankshaft 19 having a portion projecting from the upper surface of the frame 15.

On the other hand, the compression mechanism 14 is provided with a fixed scroll 21 fixed to the fixed plate 12 as in the prior art.
And the upper end of the crankshaft 19 is freely eccentrically rotatably fitted to the upper end of the crankshaft 19 and the compression space 23
And a revolving scroll 22 which is combined through the...

On the upper surface side of the fixed scroll 21, there is formed a discharge chamber 25 which communicates with the compression space 23 via a discharge port 21a provided at the center of the fixed scroll 21. The discharge chamber 25 is covered with a discharge cover 26. A discharge pipe 27 is connected to the discharge chamber 25, and the discharge pipe 27 is led out from the upper surface of the sealed case 11 to the outside in a liquid-tight manner.

An Oldham ring is provided between the lower surface of the turning scroll 22 and the upper surface of the frame 15 to prevent the turning scroll 22 from rotating, as in the conventional example. 28 is inserted. This Oldham ring 2
8 is formed as shown in FIG.

The Oldham ring 28 is provided with first and second key grooves 29a, 29b orthogonal to each other on the upper and lower surfaces of a ring main body 29 (annular body) having a rectangular cross section. The first and second key portions 30, 31 are attached to the grooves 29a and 29b, respectively.

The ring body 29 and the first and second key portions 30, 31 are made of different materials. That is, as the material of the ring main body 29, an aluminum alloy is selected in order to reduce the weight. The first and second key portions 30 and 31 are respectively fixed scrolls.
A material having excellent wear resistance and slidability is selected for the frame 21 and the frame 15, and the material of the first key portion 30 is, for example, S50C (carbon steel for machine structure) and the second material. As a material of the key portion 31, for example, SUJ2 (high carbon chromium bearing steel) which is harder than the first key portion 30 is selected.

The ring main body 29 and the first and second key portions 30 and 31 are connected using a connecting pin 33 as shown in FIG. The coupling pin 33 has a cylindrical shape, and a plurality of projections 34 are provided on an outer peripheral surface of a side 33a attached to the ring main body 29 in a circumferential direction.

On the other hand, as shown in FIG. 2B, the first key groove 29a of the ring main body 29 has a first inner diameter smaller than the outer diameter of the lower end of the coupling pin 33. A coupling hole 35 is formed. The first key portion 30 is provided with a second coupling hole 30a having an inner diameter to be tightly fitted to the upper end of the coupling pin 33. Although not shown, the second key portion 31 is also provided with a coupling hole having an inner diameter to be tightly fitted to the upper end of the coupling pin 33.

As shown in the drawing, one end of the coupling pin 33, on which the projection 34 is not provided, is first fitted (press-fit) into the second coupling hole 30a of the first key portion 30. Next, the key block Assy 36 composed of the first key portion 30 and the coupling pin 33 causes the other end 33 a of the coupling pin 33 to fit into the first coupling hole 35 of the ring main body 29.

At this time, since the ring body 29 is made of a softer material (aluminum material) than the connecting pin 33, the connecting pin 33 connects the plurality of projections 34 to the first
Is press-fitted into the inner diameter of the coupling hole 35.

Note that the second key portion 31 also
Similarly to the first key portion 30, the ring body 29 is fixed to the second key groove 29 b using the coupling pin 33.

The Oldham ring 28 thus formed
As shown in FIG. 1, the two sets of keys are the same as in the conventional example.
28b and 28c are connected to the fixed scroll 21 and the frame.
It is attached while being inserted into the respective key grooves 21a, 22a of the program 22.

By the Oldham ring 28, the revolving scroll 22 can revolve without rotating with respect to the fixed scroll 21, so that the gas in the compression spaces 23 is compressed. The fixed scroll 21 is sent from the outer periphery to the center of the fixed scroll 21 and is sequentially discharged from the discharge port 21a and the discharge pipe 27 to the outside.

According to such a configuration, the first and the second
Even when a rotational force is applied to the key portions 30 and 31, the projections 34 provided on the lower end 33a of the coupling pin 33 bite into the ring main body 2, and the first and second key portions 3
Engagement of 0, 31 with the first and second keyways 29a, 29b
No rotation due to the synergistic action of As a result, the connection between the ring main body 29 and the key portions 30, 31 can be effectively maintained, so that the first and second key portions 30,
The ring 31 is unlikely to come off the ring main body 2. Therefore, it is possible to obtain the scroll compressor 10 having the Oldham ring 1 which is less likely to be broken, is lightweight and has excellent wear resistance. The present invention is not limited to the above-described embodiment, but can be variously modified without changing the gist of the invention.

For example, in the above embodiment, the connecting pin 33
3A is used, but the present invention is not limited to this. For example, the material of the first and second keys 30 and 31 is the same as that of the coupling pin 33.
When the material is softer than the above material, a connecting pin 33 'having projections 34 formed over its entire length may be used as shown in FIG. Further, as shown in FIG. 3 (c), a connecting pin 33 ″ having a prismatic shape may be used.

Further, the shape of the projection provided on the connecting pin 33 is not limited to the above embodiment, and any shape may be used as long as the connecting pin 33 can be prevented from rotating.
For example, it may have a prismatic shape as shown in FIG. 3B or another shape. The point is that the cross-sectional shape of one end of the coupling pin 33 on the ring main body 29 side should be non-circular.

On the other hand, in the above-described embodiment, the Oldham ring 1 has first and second key portions 30 and 3 on both surfaces, respectively.
1 is provided, but the present invention is not limited to this. For example, the first key portion 30 corresponding to the fixed scroll 21 and the revolving scroll are provided only on one surface of the ring main body 29. The second key 31 corresponding to the nozzle 22 may be provided in a state of being orthogonal to each other. Further, the first and second key portions 30, 31 may be provided so as to protrude radially outward of the ring main body 29.

[0034]

As described above, the present invention comprises a frame to which a fixed scroll is fixed, and an orbiting scroll provided to the fixed scroll via a compression space. And the key portion is slidably engaged with a key groove provided in the frame or the fixed scroll and a key groove provided in the orbiting scroll, respectively, to thereby rotate the orbiting scroll. A scroll type compressor having an Oldham ring for regulating, wherein a key is attached to the annular body.
The key pin is provided in the portion, and the connecting pin is formed in a non-circular cross-sectional shape on one end side attached to the annular body.

According to such a configuration, even when a rotational force is applied to the key portion, the coupling pin does not rotate since it is locked to the annular body. As a result, the bond between the ring and the key portion can be effectively maintained, so that the key portion rarely comes off the ring. Therefore, it is possible to obtain a scroll compressor having an Oldham ring which is less likely to break, is lightweight and has excellent wear resistance.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one embodiment of a main part of the present invention.

2 (a) is a perspective view showing an Oldham ring, and FIG. 2 (b) is an enlarged perspective view showing attachment of a key part of the Oldham ring.

FIG. 3A is a perspective view showing a coupling pin,
(B) and (c) are perspective views showing a connecting pin of another embodiment.

FIG. 4A is a perspective view showing a conventional Oldham ring, and FIG. 4B is an enlarged perspective view showing attachment of a key portion.

[Explanation of symbols]

11 ... closed case, 15 ... frame, 15a ... key groove,
21: fixed scroll, 22: swivel scroll, 22a
... Key groove, 28 ... Oldham ring, 29 ... Ring body (annular body), 30 ... First key part, 31 ... Second key
Part, 33 ... connecting pin, 34 ... protrusion.

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-3-217677 (JP, A) JP-A-2-67482 (JP, A) JP-A-2-227580 (JP, A) JP-A-1- 211679 (JP, A) JP-A-5-87063 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] 1. A frame having a fixed scroll fixed thereto, an orbiting scroll provided through a compression space with respect to the fixed scroll, a key portion solidified by a connecting pin in an annular body, and A scroll-type compression system including an Oldham ring that slidably engages the key portion with a key groove provided on the frame or the fixed scroll and a key groove provided on the orbiting scroll to restrict the rotation of the orbiting scroll. Machine,
A scroll type compressor , wherein a key groove is provided in a key attaching portion of the annular body, and the connecting pin has a non-circular cross-sectional shape at one end attached to the annular body.