JP2804086B2 - Scroll compressor - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a scroll compressor used as a refrigerant compressor for refrigeration or air conditioning or an air compressor.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. 63-134890, a conventional scroll compressor is configured such that a fixed scroll base plate and an orbiting scroll base plate are separated from an oil reservoir in an airtight container in a fixed scroll base plate. An oil supply hole extending to the sliding portion is formed, and an oil supply hole which is always in communication with the oil supply hole and reaches near the center of the orbiting scroll is formed in the base plate of the orbiting scroll. By forming an oil supply hole communicating with the hole in the drive shaft or the like, oil is guided from the oil reservoir through the oil supply hole and supplied to each sliding portion, each bearing, and the like.

[Problems to be solved by the invention]

The above prior art does not consider providing an oil supply hole from an oil reservoir to a sliding portion between the base plate of the fixed scroll and the base plate of the orbiting scroll in the wide seat surface portion of the fixed scroll. It was provided in a part other than. Since the oil supply hole opened in the sliding portion of the fixed scroll needs to be always in communication with the oil supply hole of the orbiting scroll, the oil supply hole must be large enough to cover the range of the orbiting oil supply hole. I was For this reason, there has been a problem that the outer diameter of the base plate of the fixed scroll becomes large, which results in an increase in the outer diameter and weight of the entire scroll compressor.

Also, since the oil supply hole communicating with the oil sump communicates with the large-diameter oil supply hole opened in the sliding portion from the back,
There has been a problem that the lubrication path becomes long, the lubrication resistance increases, and reliable lubrication cannot be performed.

An object of the present invention is to obtain a small-diameter and lightweight scroll compressor while ensuring a sufficient oil supply amount to each sliding portion.

[Means for solving the problem]

A fixed scroll composed of a base plate and a spiral wrap integral therewith and arranged with the two wraps meshing with each other; a revolving scroll that rotates without rotating with respect to the fixed scroll; A drive shaft for orbiting the drive shaft and a frame supporting the drive shaft in a closed container, and the base plate of the orbiting scroll is slidable between the base plate of the fixed scroll and the frame. And an oil supply hole is formed in the fixed scroll base plate from an oil reservoir formed at a lower portion in the closed container to a sliding portion between the fixed scroll base plate and the orbiting scroll base plate. And an oil supply hole which is always in communication with the oil supply hole and reaches near the center of the orbiting scroll is formed in the base plate of the orbiting scroll, In the scroll compressor, an oil supply hole communicating with the oil supply hole formed in the drive shaft is formed in the drive shaft, and the oil sump is applied with the pressure of the discharge gas compressed by the fixed scroll and the orbiting scroll. The scroll has a wide sheet portion located on the outer circumference of a scroll wrap extension line which follows the outermost circumference at the end of the spiral wrap winding among the sheet portions of the fixed scroll base plate sliding portion which slides on the orbiting scroll base plate. A first oil supply hole communicating with the oil reservoir, the oil supply hole communicating with the oil reservoir, the oil supply hole is formed in the wide seat portion; Open the first sliding surface
The second, which has a diameter larger than the oil supply hole and communicates with the first oil supply hole on the lower surface.
This is achieved by providing a scroll compressor having an oil supply hole.

[Embodiment of the invention]

An embodiment of the present invention will be described below with reference to FIGS.

FIG. 1 is a longitudinal sectional view showing the overall structure of a horizontal refrigerant scroll compressor according to one embodiment of the present invention. In FIG. 1, a scroll compressor 2 and an electric motor 3 for driving the scroll compressor 2 are housed in a hermetically sealed container 1 in a horizontal arrangement. The compression mechanism 2 includes an orbiting scroll 5, a fixed scroll 6, a drive shaft 7 serving as a crankshaft driven by the electric motor 3, a frame 8, and an automatic prevention mechanism 9.

The orbiting scroll 5 is spirally wrapped on a base plate (end plate) 5a.
5b. A bearing 5c is provided at the center of the back surface of the base plate 5a, and the crankpin portion 7a of the drive shaft 7 is inserted. The base plate 5a is provided with a pressure equalizing hole 5d for communicating the space of the wrap 5b during compression with the back pressure chamber 8c.

The fixed scroll 6 fixed to the container 1 also has a base plate 6a.
It has a spiral wrap 6b on top. In addition, a suction hole 6c is provided in the outer periphery of the wrap, and a discharge hole 6d is provided in the center of the wrap.

A frame 8 fixed to the container 1 has bearings 8a, 8a 'for supporting a drive shaft 7, and a revolving scroll 5 with a fixed scroll 6
And a back pressure chamber 8c for applying an appropriate pressing force to the orbiting scroll 5 are provided.

Orbiting scroll 5 and fixed scroll 6 wrap each other
5b.6b facing inward, fixed scroll 6
The orbiting scroll 5 is held by the base 8 b and the base 8 b of the frame 8. A rotation prevention mechanism 9 for preventing the rotation of the orbiting scroll 5 is provided between the rear surface of the orbiting scroll 5 and the frame 8.

The drive shaft 7 has a crank pin 7a whose one end is supported by the bearing 5c. An oil supply hole 7c is provided in the drive shaft 7 at the center of rotation of the drive shaft 7. This oil hole 7c
Has one end opened to the end face of the crank pin 7a, and the other end opened to the bearing 8a via the oil supply hole 7f.

In the base plate 6a of the fixed scroll 6, the oil sump 4 and the base plate 6
A first oil supply hole 6e which is open and communicates with the lower surface of the oil supply device is provided. The base plate 6a is provided with a second oil supply hole 6f communicating with the first oil supply hole 6e. The second oil supply hole 6f is provided so as to open at a portion where the base plate 5a of the orbiting scroll 5 and the base plate 6a of the fixed scroll 6 slide. The base plate 5a of the orbiting scroll 5 is provided with an oil supply hole 5e extending from the outer peripheral surface to the center. The oil supply hole 5e has an inner end opening at the inner bottom surface of the bearing 5c and an opening at the outer peripheral surface of the outer end base plate 5a. The outer end of the oil supply hole 5e is closed with a screw 10. The inner end of the oil supply hole 5e faces the end of the oil supply hole 7e of the drive shaft 7. Near the outer peripheral portion of the oil supply hole 5e, a horizontal oil supply hole 5f extending in the horizontal direction is provided so as to communicate with the oil supply hole 6f of the base plate 6a of the fixed scroll 6.

FIG. 2 is an enlarged view of a refueling mechanism according to the present invention.
As the orbiting scroll 5 orbits, the horizontal oil supply hole 5f also orbits. The center of the horizontal oil supply hole 5f performs a turning motion with the same radius as the crank radius of the crank pin 7a, that is, the turning radius of the orbiting scroll 5. Therefore, it is necessary to make the radius of the second oil supply hole 6f larger than the length obtained by adding the radius of the horizontal oil supply hole 5f to the turning radius.
The 5f and the second oil supply hole 6f communicate with each other. For this reason, the second oil supply hole 6f must have a large opening radius to the sliding surface.

FIG. 3 is an arrangement diagram of the oil supply holes when the fixed scroll 6 is viewed from the wrap side. This indicates the end point of the lap suction closing.

The fixed scroll 6 has an arc portion 6g slightly larger than the maximum diameter of the wrap engagement, and has a concave portion 6h outside thereof. As a result, the fixed scroll 6 has a wrap extension.
Sheet portions 6l and 6m are formed between 6i and the arc portion 6g and the concave portion 6h. The seat portions 6l and 6m have a function of sealing the back pressure chamber 8c and the wrap suction chambers 6j and 6k. In the seats 6l and 6m, when the wrap suction chamber is closed, an oil supply hole 6f is provided in the seat 6l on the suction chamber 6j side surrounded by the orbiting scroll outer line 6n and the fixed scroll inner line 6i. I have. That is, the lubrication hole 6f is located in the wide seat portion 6l formed on the outer circumference of the scroll wrap extension 6i that follows the outermost circumference at the end of the wrap winding of the fixed scroll 6. The fixed scroll is arranged so that the wide sheet portion 6l is located at the lower portion in the container 1.

Next, the operation of the scroll compressor will be described.
When the drive shaft 7 rotates by driving the electric motor 3,
By the rotation of the crank pin 7a and the operation of the rotation preventing mechanism 9, the orbiting scroll 5 performs the orbiting movement without rotating. As a result, the space formed by the wraps 5b, 6b and the base plates 5a, 6a of the orbiting scroll 5 and the fixed scroll 6 decreases its volume while moving to the center, compresses the gas sucked from the suction hole 6c, and discharges the gas. Discharge into the container 1 through the hole 6d. The high pressure is applied to the oil reservoir 4 by the discharged gas. The discharged gas is supplied to the base plate 6a of the fixed scroll 6.
After cooling the electric motor 3 through the passage 11 formed in the frame 8, the electric motor 3 is discharged from the container 1 through the discharge pipe 1 c. 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 8e on the back of the orbiting scroll 5 is reduced by the pressure equalizing hole 5d. Thus, the pressure (intermediate pressure) lower than the discharge pressure and higher than the suction pressure is maintained.

Thereby, the bearing 5c of the orbiting scroll, the bearing 8a 'of the frame 8 and the end surface on the back pressure chamber 8c side are maintained at the above-mentioned intermediate pressure, so that the oil in the oil sump 4 receiving the discharge pressure is provided on the fixed scroll 6 Through the first oil supply hole 6e, the second oil supply hole 6f, and the horizontal oil supply hole 5f and the oil supply hole 5e provided in the orbiting scroll 5, the oil is guided to the end of the oil supply hole 7c of the drive shaft 7 by the differential pressure between the discharge pressure and the intermediate pressure. I will Therefore, oil is supplied to the sliding portions of the fixed scroll 6 and the orbiting scroll 5, and the oil supply hole 7c of the drive shaft 7 is filled with oil.
Oil is supplied to 8a and 8a '. The bearing 5e is lubricated by the oil fed to the end face from the lubrication hole 5e.

According to such a scroll compressor, the orbiting scroll 5
A wide sheet portion 6l located on the outer circumference of the scroll wrap extension 6i following the outermost circumference at the end of the spiral wrap winding of the seat portion of the sliding portion of the base plate 6a of the fixed scroll 6 sliding on the base plate 5a of the fixed scroll 6
A first oil supply hole 6e and a second oil supply hole 6f communicating with the oil sump 4 are formed so as to open on the sliding surface of the orbiting scroll 5 with the seat portion. The opening to the sliding portion of the second oil supply hole 6f can be formed large without performing the above operation. Thereby, even if the horizontal oil supply hole 5f of the scroll 5 makes a revolving motion, the second oil supply hole 6f of the fixed scroll 6 always communicating with the horizontal oil supply hole 5f can be used. Due to the pressure, the oil in the oil sump 4 can be surely supplied to the bearing 5c of the orbiting scroll 5, the oil supply hole 7c of the drive shaft 7, and the like. Therefore, it is possible to make the outer diameter size and weight of the whole scroll compressor smaller than before.

Further, a fixed scroll 6 is provided so that the wide sheet portion is located in the lower portion inside the container 1, and a large-diameter second oil supply hole 6f having an oil supply hole of the fixed scroll 6 opened on a sliding surface and a lower surface of the oil supply hole 6f. Also, since it is constituted by the first oil supply hole 5f having a small diameter communicating with the oil sump 4, the oil supply path is shortened, the oil supply with extremely low oil supply resistance is possible, and the reliability is improved.

〔The invention's effect〕

According to the scroll compressor of the present invention, an oil supply hole communicating with the oil sump is formed in a wide sheet portion of the fixed scroll so as to be opened on a sliding surface of the orbiting scroll with the seat portion. Lubrication can be reliably performed without increasing the outer diameter, so that the entire scroll compressor can be reduced in size and weight.

Further, the scroll compressor according to the present invention has a large-diameter oil supply hole in which the wide sheet portion of the fixed scroll is located at the lower part of the container, and an oil supply hole formed in the wide sheet portion is opened on the sliding surface, and the lower surface thereof and the oil With the first oil supply hole having a small diameter communicating between the reservoirs, the oil supply path is shortened, the oil supply with extremely low oil supply resistance becomes possible, and the reliability can be improved.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing the overall structure of a horizontal refrigerant scroll compressor according to the present invention, FIG. 2 is an enlarged view of a refueling mechanism shown in FIG. 1, and FIG. It is the arrangement | positioning relationship diagram of the oil supply hole which was seen. 1 ... closed container, 2 ... scroll compression mechanism, 3 ... electric motor, 4 ... oil reservoir, 5 ... orbiting scroll, 5e, 5f ...
... Refueling hole, 6 ... Fixed scroll, 6e, 6f ... Refueling hole, 6
l: seat part, 7: drive shaft, 8: frame.

Continuation of front page (56) References JP-A-63-134890 (JP, A) JP-A-64-29688 (JP, A) JP-A-64-8382 (JP, A) (58) Fields investigated (Int) .Cl. ⁶ , DB name) F04C 18/02 311

Claims (1)

(57) [Claims] 1. A fixed scroll comprising a base plate and a spiral wrap integral therewith, wherein the fixed wrap is arranged with both wraps meshing with each other, and a revolving scroll which revolves without rotating with respect to the fixed scroll; A drive shaft for orbiting the scroll with respect to the fixed scroll, and a frame supporting the drive shaft are provided in a sealed container, and the base of the orbiting scroll is provided between the base plate of the fixed scroll and the frame. The plate is slidably held, and an oil supply hole extending from an oil reservoir formed at a lower portion in the closed container to a sliding portion between the base plate of the fixed scroll and the base plate of the orbiting scroll is provided in the base of the fixed scroll. A lubrication hole is formed in the base plate of the orbiting scroll, and a lubrication hole is formed in the base plate of the orbiting scroll. A scroll compressor in which an oil supply hole communicating with an oil supply hole formed in a base plate of the roll is formed in the drive shaft, and the oil reservoir is configured to apply pressure of a discharge gas compressed by the fixed scroll and the orbiting scroll. Wherein the fixed scroll has a wide width located on the outer circumference of a scroll wrap extension line that follows the outermost circumference at the end of the spiral wrap winding of the sheet portion of the fixed scroll base plate sliding portion that slides with the orbiting scroll base plate. The seat portion is configured to be located at a lower portion in the closed container, the wide seat portion is formed with the oil supply hole communicating with the oil reservoir, and the oil supply hole is connected to the first oil reservoir with the first oil reservoir. A scroll compressor, comprising: an oil supply hole; and a second oil supply hole which is opened on the sliding surface and has a diameter larger than the first oil supply hole and communicates with the first oil supply hole on a lower surface.