JP2680060B2 - Horizontal scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a horizontal scroll compressor used as a refrigerating or air-conditioning refrigerant compressor or an air compressor, and more particularly to an Oldham ring for preventing rotation of an orbiting scroll. Refueling structure.

[Conventional technology]

In the conventional horizontal scroll compressor, an Oldham mechanism for preventing the orbiting scroll from rotating is disclosed in, for example, Japanese Patent Laid-Open No. 61-
As described in No. 87994, an annular member is disposed between the back surface of the orbiting scroll and a stationary pedestal provided on the frame, one end surface of the annular member and the orbiting scroll back surface, and the other end surface of the annular member. Has a structure in which a stationary pedestal provided on the frame is engaged via a key and a key groove, respectively. However, no consideration was given to the lubrication method at the sliding portion between the key and the key groove.

[Problems to be solved by the invention]

The above-mentioned prior art does not consider the lubrication method for the sliding portion between the key and the key groove, and the sliding portion causes seizure and astringency.

The object of the present invention is to reliably supply oil to the key and the key groove that are the sliding parts of the Oldham mechanism. It is to reliably lubricate the sliding part by splashing on the upper part of the back pressure chamber at the annular part of the Oldham ring.

[Means for solving the problem]

In order to achieve the above-mentioned object, the present invention comprises a fixed scroll and an orbiting scroll which are composed of a base plate and a spiral wrap integral therewith, and are arranged so that both the wraps are meshed with each other, and the orbiting scroll is rotated about the fixed scroll. An Oldham ring, which is a rotation preventing mechanism for rotating without rotation, a drive shaft for rotating the orbiting scroll with respect to a fixed scroll, and a frame for horizontally supporting the drive shaft via bearings are provided in a closed container. The base plate of the orbiting scroll is slidably sandwiched between the base plate of the fixed scroll and the frame, and an intermediate pressure between suction pressure and discharge pressure is applied between the back surface of the orbiting scroll and the frame. In a horizontal scroll compressor in which a back pressure chamber is formed, and the Oldham ring is arranged in the back pressure chamber, discharge into the closed container. The air inside the closed container to the discharge pressure atmosphere, and an oil reservoir is formed in the lower part of the closed container, and the oil accumulated in the oil reservoir below the closed container is separated from the discharge pressure and the intermediate pressure. A first oil supply hole that is guided by pressure to the sliding portion between the base plate of the fixed scroll and the orbiting scroll base plate through the base plate of the fixed scroll, and the first oil supply hole formed in the base plate of the orbiting scroll. A second oil supply hole that connects the hole and the bearing portion of the orbiting scroll and a third oil supply hole that is formed in the drive shaft and that connects the second oil supply hole and the bearing that supports the drive shaft are provided. , The oil in the oil sump in the lower part of the closed container through these oil supply holes lubricates the orbiting scroll bearing and the bearing that supports the drive shaft, and is then guided to the back pressure chamber, and the Oldham ring is the rear of the orbiting scroll. And provided on the frame A key that engages with the key groove and slides is provided in the annular portion, and the key groove formed in the frame that slides with the key of the Oldham ring is provided in the upper part and the lower part of the frame. The key of the Oldham ring is vertically formed in the groove so as to slide in the vertical direction, and the Oldham ring is configured to move vertically in the back pressure chamber.

With the above configuration, the oil accumulated in the lower portion of the closed container is not formed in the first plate formed in the base plate of the fixed scroll.
Through the oil supply hole of the fixed scroll and the base plate of the orbiting scroll, and from there through a second oil supply hole formed in the base plate of the orbiting scroll, 3rd lubricated and formed in the drive shaft
It is guided to the bearing that supports the drive shaft and lubricates through the oil supply hole. Most of the oil that lubricates the orbiting scroll bearing and the bearing that supports the drive shaft is then guided to the back pressure chamber and accumulates in the lower portion of the back pressure chamber. When the drive shaft rotates, the Oldham ring arranged in the back pressure chamber moves up and down along the vertical keyway formed in the frame together with the orbiting motion of the orbiting scroll. As a result, the Oldham ring splashes upward the oil accumulated in the lower part of the back pressure chamber, and this splashed oil can supply a sufficient amount of oil to the sliding portion between the key and the key groove of the Oldham ring, Since it is possible to surely lubricate the Oldham ring sliding portion, it is possible to reliably prevent the sliding portion from seizing or sticking.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. FIG. 1 is a longitudinal section showing the overall structure of a horizontal refrigerant scroll compressor according to an embodiment of the present invention. In FIG. 1, a scroll compression mechanism 2 and an electric motor 3 for driving the scroll compression mechanism 2 are horizontally arranged and housed in a closed container 1.
The bottom is an oil sump 4.

The scroll compression mechanism 2 includes an orbiting scroll 5, a fixed scroll 6, a drive shaft 7 serving as a crank shaft driven by the electric motor 3, a frame 8, and a rotation preventing mechanism 9.

The orbiting scroll 5 has a spiral wrap 5b on a base plate (mirror number) 5a. A bearing (orbiting scroll bearing) into which the crank pin portion 7a of the drive shaft 7 is inserted on the back surface of the base plate 5a.
5c is provided, and the base plate 5a is provided with a pressure equalizing hole 5d that communicates the lap 5b space during compression and the back pressure chamber 8c.

Further, a key groove 5g on which a key 9b of an Oldham ring (rotation preventing mechanism) 9 slides is provided on the back surface.

The fixed scroll 6 fixed to the container 1 also has a base plate 6a.
It has a spiral wrap 6b. Further, a suction hole 6c is provided in the outer peripheral portion of the wrap, and a discharge hole 6d is provided in the central portion of the wrap.

On the frame 8 fixed to the container 1, bearings 8a, 8a 'which hinder the drive shaft 7, and the orbiting scroll 5 are fixed scroll 6
And a back pressure chamber 8c for applying an appropriate pressing force to the orbiting scroll 5.

Orbiting scroll 5 and fixed scroll 6 wrap each other
5b, 6b are turned inward and fixed scroll 6
And the pedestal 8b of the frame 8 hold the orbiting scroll 5 therebetween. A rotation preventing mechanism (Oldham ring) 9 for preventing rotation of the orbiting scroll is installed between the rear surface of the orbiting scroll and the frame.

The drive shaft 7 has a crank pin 7a whose one end is supported by the bearing 5c. In the drive shaft 7, an oil supply hole 7c is provided on the rotation center of the shaft 7. One end of this oil supply hole 7c opens to the end face of the crank pin 7a, and the oil supply holes 7f, 7f
The bearings 8a, 8a 'are opened through f'.

In the base plate 6a of the fixed scroll 6, an oil supply hole 6e communicating with the oil sump 4 and a portion in which the base plate 5a of the orbiting scroll 5 and the base plate 6a of the fixed scroll 6 communicate with the oil supply hole 6e and slide. An oil supply hole 6f opening to the is provided. Further, in the base plate 5a of the orbiting scroll 5, an oil supply hole 5e that connects the end surface of the bearing 5c and the outer periphery of the base plate 5a is provided, and the outer end of the oil supply hole 5e is closed by a screw 10. . The inner end of the oil supply hole 5e faces the oil supply hole 7c in the drive shaft 7. The sliding portion of the base plate 5a with respect to the base plate 7a of the fixed scroll 6 is provided with an oil supply hole 5f which communicates the oil supply hole 5e with the oil supply hole 6f in the fixed scroll 6.

 FIG. 2 shows an enlarged view of the arrangement relationship of the oil supply holes.

Due to the turning movement of the orbiting scroll 5, the center of the oil supply hole 5f makes a turning movement with the same radius as the crank radius of the crank pin 7a, that is, the turning radius of the orbiting scroll. On the other hand, the sum of the radius of the oil supply hole 5f and the radius of the oil supply hole 6f is equal to or larger than the radius of the turning motion of the oil supply hole 5f.
During the orbiting motion of the orbiting scroll 5, the oil supply holes 5f and 6f are always communicated with each other.

Next, the operation of the scroll compressor will be described.
When the drive shaft 7 is rotated by the electric motor 3, the crankpin 7a
The orbiting scroll 5 performs the orbiting motion without rotating due to the rotational motion and the operation of the anti-rotation mechanism 9. As a result, the wraps 5b, 6 of the orbiting scroll 5 and the fixed scroll 6
The space formed by b and the base plates 5a and 6a decreases its volume while moving to the center, compresses the gas sucked from the suction hole 6c,
Discharge is performed from the discharge hole 6d. The discharged gas is discharged from the discharge pipe 1c after cooling the electric motor 3 through the passage 11 formed in the base plate 6a of the fixed scroll 6 and the frame 8. When the scroll performs a compressing action, a force acts to separate the orbiting scroll 5 and the fixed scroll 6 from acting. To prevent this, the pressure in the back pressure chamber 8c on the back of the orbiting scroll is increased by the pressure equalizing hole 5d. Is maintained at a pressure lower than the discharge pressure and higher than the suction pressure (intermediate pressure).

As a result, the end surfaces of the bearing 5c of the orbiting scroll and the bearing 8a 'of the frame on the back pressure chamber 8c side are kept at the intermediate pressure, so that the oil in the oil sump 4 is supplied to the fixed scroll.
6e, 6f and the oil holes 5f, 5e provided in the orbiting scroll are guided to the end of the oil hole 7c of the drive shaft by the differential pressure between the discharge pressure and the intermediate pressure, so the oil hole 7c is filled with oil. , And further bearings 8a, 7a
8a 'is refueled. The bearing 5c is refueled with the oil sent to the end surface through the oil refilling hole 5e.

The supplied oil is discharged to the back pressure chamber 8c and collected in the lower part of the back pressure chamber 8c. The fixed rotation preventing mechanism 9 is provided with a stationary pedestal 8d above and below the frame 8, and the stationary pedestal 8d is provided with a key groove 8e in which the key 9a of the Oldham ring 9 slides, so that the Oldham ring moves up and down. By the vertical movement of the Oldham ring, the oil accumulated in the lower part of the back pressure chamber 8c is splashed upward, and the oil is supplied to the key groove 8e of the stationary pedestal 8d provided above the frame 8.

〔The invention's effect〕

As described above, according to the present invention, the Oldham ring, which is the rotation preventing mechanism, can be moved up and down along the vertical keyway formed in the frame together with the orbiting movement of the orbiting scroll. Oil accumulated in the lower part of the pressure chamber is splashed upward, and this splashed oil can supply a sufficient amount of oil to the sliding part between the key and the key groove of the Oldham ring, and lubricates the sliding part of the Oldham ring. Therefore, there is an effect that it is possible to surely prevent the sliding portion from seizing or sticking.

[Brief description of the drawings]

FIG. 1 is a sectional view showing the entire structure of a horizontal hermetic scroll compressor which is an embodiment of the present invention, FIG. 2 is a partially enlarged view of FIG. 1, FIG. 3 is a sectional view of an orbiting scroll, and FIG. FIG. 4 is a plan view of the frame, and FIG. 5 is a perspective view of an annular member of the Oldham mechanism. 1 ... closed container, 2 ... scroll compression mechanism, 3 ... electric motor, 4 ... oil reservoir, 5 ... orbiting scroll, 5e, 5f ...
… Lubrication hole, 6 …… Fixed scroll, 6e, 6f …… Lubrication hole,
7 ... Drive shaft, 8 ... Frame, 9 ... Rotation prevention mechanism.

Claims (1)

(57) [Claims] 1. A fixed scroll and an orbiting scroll, which are composed of a base plate and a spiral wrap integral with the base plate, and are arranged so that both wraps mesh with each other, and rotation prevention for rotating the orbiting scroll with respect to the fixed scroll without rotating it. An Oldham ring, which is a mechanism, and a drive shaft for orbitally driving the orbiting scroll with respect to the fixed scroll,
A frame for horizontally supporting the drive shaft via a bearing is provided in an airtight container, and the base plate of the orbiting scroll is slidably sandwiched between the base plate of the fixed scroll and the frame to form a orbiting scroll. In a horizontal scroll compressor in which a back pressure chamber to which an intermediate pressure between suction pressure and discharge pressure is applied is formed between the rear surface of the frame and the frame, and the Oldham ring is arranged in the back pressure chamber, The discharge gas is introduced into the container to create an atmosphere of discharge pressure in the closed container, and an oil reservoir is formed in the lower part of the closed container. A first oil supply hole, which is formed in the orbiting scroll base plate by a pressure difference from the pressure, leads to a sliding portion between the base plate of the fixed scroll and the orbiting scroll base plate through the inside of the base plate of the orbiting scroll. First refueling And a third oil supply hole connecting the bearing part of the orbiting scroll and the third oil supply hole formed in the drive shaft and connecting the second oil supply hole and the bearing supporting the drive shaft, The oil in the oil reservoir in the lower part of the hermetic container through these oil supply holes lubricates the orbiting scroll bearing and the bearing that supports the drive shaft, and is then guided to the back pressure chamber, and the Oldham ring is connected to the orbiting scroll rear surface. A key that engages with and slides in a key groove provided in the frame is provided in the annular portion, and the key groove formed in the frame that slides with the key of the Oldham ring is provided in the upper and lower portions of the frame. The
A horizontal scroll compressor characterized in that the keys of the Oldham ring are vertically formed so as to slide vertically in each key groove, and the Oldham ring is configured to move vertically in the back pressure chamber.