JPS6361787A - Scroll volume type machine - Google Patents

Abstract

PURPOSE:To prevent splashes of lubricating oil from being mixed in compressed gas and to prevent consumption of lubrication, by a method wherein a screw pump is mounted to a crank part at the upper end of a main shaft, and an oil extraction hole is formed in the bottom of the thrust bearing part of a frame. CONSTITUTION:When a main shaft 4 is started to rotate, after lubricating oil pumped up with the aid of a lubrication pump 4a lubricates a contact surface between a main shaft and a frame 12 and between a crank part 4b and a cylinder 1c, oil is fed to the upper surface of the crank part 4b. The lubricating oil is splashed, and is drained through an oil extraction hole 12b of the frame 12 to an under surface. Thus, since the lubricating oil does not pass a gas flow passage, an amount of lubricating oil being mixed in gas is decreased, and lubrication is effected by means of a small amount of lubricating oil.

Description

[Detailed description of the invention] [Purpose of the invention] (Industrial application field) This invention relates to scroll displacement machines.

(Prior Art) A scroll compressor, which is a typical example of a conventional scroll displacement machine, is described in Japanese Unexamined Patent Publication No. 60-75791, and will be explained with reference to FIG.

The orbiting scroll 1 consists of an end plate 1 m and a wrap 1 b standing upright on the end plate 1 m, and the wrap 1 b has an immovable,
- It is formed by a curve similar to an involute or an involute. The fixed scroll 2 has the same configuration as the orbiting scroll 1, and is provided with a discharge hole 2C in a portion corresponding to the center of the involute curve of the end plate 2a. The orbiting flow /L/1 and the fixed scroll 2 are combined with the wraps 1a and 2b (with their respective wraps 1a and 2b shifted by a certain angle) with the wraps facing each other inside.

The orbiting scroll 1 is rotated so as not to rotate with respect to the fixed scroll 2, and the compression chamber is contracted to compress the gas and discharge it from the discharge hole 2C. In addition, orbiting scroll 1
is rotated by the main shaft 4.

When the main shaft 4 starts rotating, the movement is restricted by the Oldham ring 16, and the rotating souffler 1 starts a rotating movement. At this time, the gas sucked into the closed container 8 from the suction vibro enters between the end plate 1 of the orbiting scroll 1 and the end plate 2a of the fixed scroll 2 between both scrolls. The sealed space closed by both the fixed souffler 2 and the rotating souffle 1 becomes smaller as the contact point of the wraps 1b and 2b approaches the center, and the gas in the space is compressed. The compressed gas is discharged from the discharge hole 2C and exits from the closed container 8 through the discharge pipe 10.

The lubricating oil stored in the lower part of the sealed container 8 is supplied to the main shaft 4, the frame 12, and the main shaft 4 by the oil supply pump 4a of the main shaft 4.
The contact surface between the crank part 4b and the cylindrical IC of the orbiting scroll 1 is lubricated, and then the upper surface of the crank part 4b is supplied with oil. The lubricating oil supplied to the upper surface scatters through a hole 1d provided in the cylinder IC and exits the cylinder lc.

(Problem to be solved by the invention) However, at this time, since the position of the hole 1d provided in the cylindrical IC for letting the lubricating oil out of the cylindrical IC is at the upper end of the main shaft 4, the lubricating oil is absorbed into the gas by the suction vibro. The mixture enters between both scrolls, is compressed, and exits from the closed container 8 through the discharge vibrator 10. For this reason, the lubricating oil in the closed container 8 sometimes ran out. Therefore, a large amount of lubricating oil was required.

Therefore, an object of the present invention is to provide a scroll displacement machine in which lubricating oil is difficult to mix with gas so that lubricating oil can be lubricated with a small amount of lubricating oil.

[Structure of the invention] (Means for solving the problem) In order to achieve this objective, this invention has the following structure. In other words, a screw pump is installed on the sliding contact surface between the cylinder of the orbiting scroll and the crank part of the main shaft to guide the lubricating oil supplied to the main shaft to the lower end of the cylinder, and a screw pump is installed to guide the lubricating oil supplied to the main shaft to the lower end of the cylinder. It has oil drain holes in 7 frames to lead to the lower part.

(Operation) When the main shaft starts rotating, lubricating oil is supplied above the main shaft, and some of the oil is supplied to the upper part of the main shaft. This lubricating oil is supplied to the lower end of the cylinder by a screw pump provided on the sliding surface of the cylinder and the crank portion, and is discharged to the lower side of the frame through an oil drain hole provided in the frame.

(Example) An example of the present invention will be described below with reference to M1 diagram. The same reference numerals as in FIG. 3 are given to the parts that are the same as or corresponding to the conventional ones, and these parts are numbered 11! Details are omitted.

The 7-frame model has a main bearing 12a, an oil drain hole 12b, and a gas hole 12C, and is press-fitted into the closed container 8.

A fixed scroll 2 and a cover 3 are fixed to the outer periphery of the frame with bolts 18.

The high pressure receiving ring 14 is mounted on the frame 12 and has a concave cross section.

The orbiting scroll 1 is placed on a high pressure receiving ring 14 and meshes with the fixed scroll 2. The space created by the high-pressure receiving ring 14 together with the end plate 1 communicates with the closed space closed by the orbiting scroll 1 and the fixed scroll 20 through pressure holes 1e provided in the end plate 1a.

The Oldham ring 16 is mounted so as to be engaged with the frame 12, and is engaged with the end plate 1m of the orbiting scroll 1, so that the orbiting scroll 1 can orbit without rotating.

The main shaft 4 is rotatably supported by a main bearing 12a of the frame 12, and the crank portion 4b is rotatably inserted into the cylindrical IC of the orbiting scroll 10. The main shaft 4 also has an oil supply pump 4a inside.

The electric motor section is composed of a rotor 20 and a stator η. The rotor 20 is fixed to the main shaft 4, and the stator n is press-fitted into the closed container 8.

The support member 24 is press-fitted and fixed to the lower part of the closed container 8, and the main shaft 4 passes through the center without contacting it.

The lower oil guide is fixed to the support member and arranged around the outer periphery of the main shaft 4.

Next, the operation of this embodiment will be explained.

When the main shaft 4 is rotated by the electric motor section, the orbiting scroll 1 performs an orbiting motion. Due to this rotational movement, the gas entering the closed container B from the suction vibro passes through the gas hole 12G of the frame 12, and enters between the end plate 1m of the orbiting scroll 1 and the end plate 2a of the fixed scroll 2 between both scrolls. The gas compressed between both scrolls is discharged through the discharge hole 2C.
It is discharged from the closed container 8 through the discharge pipe 10. A part of the compressed gas is transferred to the end plate 1 of the orbiting scroll 1.
The high pressure receiving ring 14 is connected through the pressure hole IC provided in m.
You will be guided to the space created by the 1m mirror plate. Using this gas pressure, an axial pressing force is applied to the orbiting scroll 1.

The lubricating oil pumped up by the oil supply pump 41 of the main shaft 4 lubricates the contact surfaces between the main shaft 4 and the frame 12, the crank part 4b of the main shaft 4, and the cylindrical IC of the orbiting scroll 10, and then is supplied to the upper surface of the crank part 4b.

The lubricating oil supplied to the upper surface is supplied to the lower end of the cylinder by a screw pump 4C provided on the crank portion 4b. The lubricating oil supplied to the lower end of the cylinder scatters onto the frame 12 and is discharged to the lower surface of the frame through the oil drain hole 12b of the frame 12.

In this way, since the lubricating oil does not pass near the gas flow path, it is less likely to be mixed with the gas, and lubrication can be achieved with a small amount of lubricating oil.

Furthermore, the structure of the comparative crank portion 4b becomes simpler than before.

〔Effect of the invention〕

As described above, the present invention has the effect that more lubricating oil than necessary is difficult to mix with gas.

[Brief explanation of the drawing]

Figure 1 shows 1. FIG. 2 is a sectional view of a scroll compressor showing an embodiment of the present invention. FIG. 2 is a perspective view of a main part of the main shaft of the scroll compressor shown in FIG. 1, and FIG. 3 is a sectional view of a conventional scroll compressor. 1...Orbiting scroll 2...Fixed scroll 4...Main shaft 12...Frame Fig. 2 Main part of main wheel tooth #4F L Fig. 1 1 orbiting scroll 7.1. Y °°disturbance frame 1c
Lko\4b ---, = S complete distribution Toban saw main 22 axis 2□
2, □Figure 3

Claims (1)

[Claims] A fixed scroll having an end plate and a wrap standing upright on the end plate, an end plate and a wrap standing upright on the end plate, and a cylinder standing upright on the opposite side of the end plate, and this wrap is fixed. An orbiting scroll that rotates while engaging with the wrap of the scroll, a frame having a main bearing and whose outer periphery is connected to a fixed scroll, an oil supply pump and a crank part, supported by the main shaft stage of the frame, and a frame having a main bearing and a fixed scroll. In a scroll displacement machine that has a main shaft inserted into the cylinder of an orbiting scroll, and lubricating oil supplied to the upper end of the main shaft by an oil supply pump of the main shaft, the lubricating oil supplied to the upper end of the main shaft is transferred to the lower end of the cylinder. In order to lead to
A scroll displacement machine characterized by having a screw pump provided on the sliding surface of the crank part of the main shaft and the cylinder, and a hole made in the frame for returning lubricating oil led to the lower end of the cylinder to the lower part of the case.