JPS58140494A - Hermetic vertical electric compressor - Google Patents

Abstract

PURPOSE:To simplify the work of an oil feeding hole by a method wherein a compression mechanism is constituted by rotating and fixed scrolls consisting of a mirror plate and a scroll-shaped lap standing vertically on the mirror plate while oil is fed from the oil feeding holes provided on the fixed scroll to the sliding surfaces of both scrolls. CONSTITUTION:The fixed scroll 10 is bored with a plurality of oil feeding holes 18 and the rotating scroll 1 is formed by the mirror plate 2 and the scroll-shaped lap 3 standing vertically on the mirror plate 2 while oil holding parts 30, pinching points 27 opposing to the oil feeding holes 18 and consisting of two sets of wide parts 28 and a narrow part 29 connecting the wide parts, are provided independently for each opposing oil feeding holes. The oil feeding holes 18 effect relative rotating motions with respect to the oil holding parts 30 due to the relative rotating motion between the fixed and rotating scrolls and thereby feeding the oil.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electric compressor having a scroll compression mechanism, and more particularly to a structure for lubricating a scroll end plate surface with a simple structure.

In a conventional scroll compressor, as shown in FIG. 1, the sliding surface 4 between the end plate 2 of the orbiting scroll 1 and the fixed scroll 3 is
Lubrication is provided through the oil supply hole 5 provided in the end plate 2 of the orbiting scroll 1.
6 to the orbiting bearing boss portion 7 on the back surface of the orbiting scroll 1
Oil was supplied through an oil hole 7a provided in the tank.

For this reason, l) It is necessary to provide oil supply holes 5 and 6 in the S orbiting scroll 1, and a stopper 8 for sealing the tip of the oil supply hole 5 is also required.

Furthermore, since the oil in the nine oil holes 7a provided in the orbiting bearing boss 7 is supplied to both the orbiting bearing 9 and the orbiting scroll end plate 4, it is difficult to balance the amount of oil between the two, resulting in excessive oil supply to the end plate. If this happens, there is a drawback that the lubrication of the swing bearing becomes insufficient.

The present invention simplifies the machining of the oil supply hole by supplying oil to the orbiting scroll end plate and the sliding surface of the fixed scroll from the fixed scroll side without going through the orbiting scroll, and by supplying oil to the orbiting bearing independently. The purpose of this is to stabilize the oil supply to the swinging wheels.

In order to achieve the above object, the present invention has a feature in that a fixed scroll is provided with an oil supply hole so that oil can be reliably supplied with a simple structure.

Since the oil supplied to the orbiting scroll mirror plate ultimately flows into the suction chamber, which is a low-pressure area around the wrap, any oil supply route can be taken as long as the oil supply source has a high pressure higher than the income pressure.

Therefore, by separating the oil supply path from the oil supply path of the swing bearing, it is possible to simplify the flow and stabilize the oil supply.

An embodiment of the present invention will be described below with reference to FIGS. 2 to 5.

An orbiting scroll 1 having a thinly wound wrap 3 standing upright on an end plate 2 is assembled with a fixed scroll 10 with the wraps facing inward, and is enclosed by a frame 14.

On the rear surface V of the orbiting scroll, a rotation bearing boss 7 and an anti-rotation mechanism 11 are provided.
The crank 13 of the crankshaft 12 is inserted into the receiver 9V.

The crankshaft 12 is supported by a frame 14, and at the shaft end,
A motor 15 is installed.

These compression mechanisms are housed in a valley closure device 16, and the lower part of the closed container is an oil reservoir 17.

The fixed scroll 10 has an oil supply hole 18 that opens to the end plate 2 of the orbiting scroll 1 and the sliding portion s4 of the identification scroll.

Due to the rotation of the motor 15, the orbiting scroll 1 performs an orbiting motion relative to the constant b scroll 10 by means of the crank 13 and the rotation prevention mechanism 11.

As a result, the volume of the space formed by the orbiting scroll and the fixed scroll decreases as it moves toward the center, compressing the gas sucked in through the suction port 19 and discharging it through the discharge hole 20 of the fixed scroll.

The discharged gas flows downward through the passage 21, cools the motor, and then is discharged to the outside of the compressor from the discharge pipe 22. It opens into the oil sump 17 at the bottom.

The pressure in the oil reservoir is high and the pressure in the oil supply hole is low. Due to the differential pressure, oil is supplied to the sliding part 4 of the orbiting scroll end plate through the passage 23 and the oil supply hole 18, while oil is supplied to the orbiting bearing 9. This is done through the oil supply hole 24 provided in the crankshaft 12, and the oil supply to the orbiting bearing and the oil supply to the orbiting scroll end plate are performed independently.

The passage 23 communicating with the oil supply hole 18 may open into the oil reservoir 17 at the bottom of the container as shown in FIG. 2, but since the gas discharged from the discharge hole 20 also contains oil, the passage 23 in FIG. An oil reservoir 26 may be provided on the outer surface of the fixed scroll 10 and opened there. Further, the back pressure chamber 25 formed on the back surface of the orbiting scroll also contains oil from the bearing that supports the crankshaft, so the back pressure chamber 25 may be opened there.

Moreover, even if a plurality of oil supply holes 18 are provided as shown in FIG.
Even individual pieces are fine.

Here, an example is shown in which four are provided at 90° intervals.

Furthermore, it is even more effective to provide a groove, recess, etc. for retaining oil at a position corresponding to the oil supply hole 18 on the orbiting scroll end plate.

An example is shown in FIG. Two wide parts 28 are formed on the end plate 2 of the orbiting scroll, sandwiching the point 27 facing the oil supply hole 18.
and the oil holding part 30 consisting of the 1-narrow part 29 connecting this,
The relationship between the oil holding portion 30 and the oil filling hole 18 is as shown in FIG. The refueling hole performs a pivoting movement relative to the portion 30.

Therefore, the oil supply hole communicates intermittently with the movement oil holding portion 30 as shown by broken lines in FIG. Further, this communication is sequentially established in accordance with the rotation of the orbiting scroll.

The movement of this oil supply hole is equal to the amount of rotation of the main shaft. Therefore, depending on the amount of rotation, the width of the oil holding portion 30 may vary.
It is possible to constantly communicate with the oil supply hole or to communicate intermittently0.Furthermore, although an independent oil holding part 30 is shown here, it is also possible to connect the entire circumference with a ring-shaped groove. It is.

The specifications of these can be changed depending on the purpose of lubricating the head plate.

That is, in the case of oil supply only for lubrication, a ring groove around the entire circumference is sufficient, and the number of oil supply holes can also be reduced. In order to control the amount of oil supplied, K can be solved by providing an oil holding part 30 that communicates intermittently.

Furthermore, in order to prevent interlocking of the orbiting scroll due to the overturning moment acting on the orbiting scroll,
As shown in the example shown here, the above-described structure allows communication with the independent oil retaining portions 30 in sequence, so that the end plate of the orbiting scroll can be easily formed without providing an oil supply hole that is difficult to process. can be refueled.

Furthermore, by separating the oil supply to the slewing bearing, the lubrication to the slewing bearing can also be done in digits.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional view of a conventional scroll compressor, Figure 2 @2
Figure a is a sectional view of the scroll compressor of the present invention, Figure 3 is a bottom view of the fixed scroll of the present invention, Figure 5 is a top view of the orbiting scroll of the present invention, and Figure 5 is oil retention on the orbiting scroll end plate. FIG. 3 is a top view showing the relationship between the fixed scroll oil supply hole position and the fixed scroll oil supply hole position.

Claims (1)

[Claims] 1. It has an orbiting scroll and a fixed scroll consisting of a base plate (end plate) and a thinly wound wrap standing upright on the end plate, and both scrolls are combined by rotating the wraps inwardly, In an electric compressor having a scroll compression mechanism that performs relative movement of both scrolls so that the space formed by each wrap and end plate moves toward the center of the scroll and thus reduces its volume, the sliding surface of the end plate of both scrolls An electric compressor characterized in that oil is supplied through an oil supply hole provided in a fixed scroll. 2. The electric compressor according to claim 1, wherein the oil supply hole provided in the leg scroll is connected to an oil sump inside the compressor. 3. The oil sump inside the compressor is the oil sump at the bottom of the closed container. An electric compressor according to claim 2. 4. The electric compressor according to claim 2, wherein the oil reservoir inside the compressor is an oil reservoir in a back pressure chamber. 5. The electric compressor according to claim 1, wherein the oil supply hole provided in the fixed scroll communicates with an oil reservoir provided on the outer surface of the fixed scroll. 6 Orbiting scroll and fixed scroll consisting of a base plate (mirror plate) and a thinly wound wrap standing upright on this spring plate.
T-! L. A scroll in which both scrolls are assembled with their wraps facing inward, and the scrolls are moved relative to each other so that the volume of the space formed by each wrap and end plate decreases as it moves toward the center of the scroll. In an electric compressor having a compression mechanism, oil is supplied to the sliding surfaces of the end plates of both scrolls from an oil supply hole provided in a fixed scroll, and an oil retaining portion is provided on a plate portion of the orbiting scroll that faces the oil supply hole of the fixed scroll. An electric compressor characterized by forming: 7. The electric compressor according to claim 6, wherein the oil holding portion and the oil supply hole communicate with each other intermittently. 8. The electric compressor according to claim 7, wherein a plurality of oil holding portions are provided independently from each other, and the oil holding portions are successively communicated with the oil supply hole in response to the orbiting movement of the orbiting scroll. 9 Claim 6 in which the oil retaining portion is a ring-shaped paste
Electric compressor as described in section.