JPH01159484A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To lubricate concurrently both a bottom plate section and a lap section in a simple manner by providing a groove in a spiral form, one end of which is opened to a back pressure chamber and the other end of which is opened to an inlet chamber, for the bottom plate of a revolving scroll. CONSTITUTION:One end of a groove 24 in a spiral form provided for the bottom plate 2a of a revolving scroll 2 is opened to a back pressure chamber 20, and the other end of it is opened to an inlet chamber 12. Since the pressure of the back pressure chamber 20 is communicated with the inlet chamber 12 via the groove 24 in a spiral form of the revolving scroll 2, the midway between discharging pressure and suction pressure is subjected to pressure. Hence, lubricant 21 accumulated in the bottom of a hermetic container 10 is led to the back pressure chamber 20 by the difference in pressure, and is furthermore led into the inlet chamber 12 via the groove 24 in a spiral form of the revolving scroll 2.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor used as a refrigerant compressor for refrigeration and air conditioning, refrigerators, and the like.

Prior art The basic configuration will be explained with reference to FIGS. 4 to 7. For ease of explanation, a solid line arrow indicating the flow direction of the working gas and a broken line arrow indicating the flow direction of the lubricating oil are inserted. FIG. 5 shows an overall configuration diagram of a conventional hermetic scroll compressor for an air conditioner. The compressor includes two scrolls, a fixed scroll 1 and an orbiting scroll 2, which are compression elements, an anti-rotation member 3 and a main shaft 4, which prevent rotation of the orbiting scroll 2, and three bearings supporting the rotation, namely, an orbiting bearing. 6, a main bearing 6, an auxiliary bearing 7, an electric motor 8, a stationary member block 9 for fixing the fixed scroll 1, and the like, and these mechanical parts are housed inside an airtight container 1o.

The operation of the compressor will be explained according to the flow of refrigerant gas.

The low-temperature, low-pressure refrigerant gas is guided from the suction pipe 11 and reaches the suction chamber 12 within the fixed scroll 1 . As shown in FIG. 6, the refrigerant gas that has reached the compression element portion gradually shrinks the closed spaces 13a and 13b formed by both scrolls due to the revolving movement of the orbiting scroll 2, which is prevented from rotating, and moves to the center of the scroll. At the same time, the pressure of the refrigerant gas is increased and it is discharged from the central discharge hole 14. The discharged high-temperature, high-pressure refrigerant gas fills the motor chamber 18 through the discharge chamber 16, which is the upper space within the closed container 1o, and the communication passage 16, 17, and is guided to the outside through the discharge pipe 19.

On the other hand, a back pressure chamber 20 in a space surrounded by the back surface of the orbiting scroll 2 and the block 9 has a back pressure chamber 20 that resists the gas force in the thrust direction due to gas pressure in a plurality of sealed spaces formed by both fixed and orbiting scrolls. Therefore, a pressure between suction pressure and discharge pressure acts. To set the intermediate pressure, use the orbiting scroll 2.
Pores 2b and 2c are provided in the end plate portion 2a of the pores 2b and 2c.
The gas inside the scroll, which is in the middle of compression, is guided to the back pressure chamber through the compressor 2c, and gas force is applied to the back surface of the orbiting scroll 2.

Next, the flow of lubricating oil will be explained.

Lubricating oil 21 is stored in the lower part of the closed container 1o.

The lower end of the main shaft 4 is immersed in the oil at the bottom of the container.
It engages with the orbiting scroll 2, which is a compression element part, through the. The main shaft 4 has an eccentric vertical hole 4b formed from the lower end of the main shaft to the upper end surface of the main shaft for supplying oil to each bearing section.

The lower end of the main shaft 4 immersed in the lubricating oil 21 is in an atmosphere of high discharge pressure (Pd), while the downstream swing bearing S
Nomawashi is in an atmosphere of intermediate pressure (Pm), so (
Due to the pressure difference between Pd and Pm, the lubricating oil 2 at the bottom of the sealed container
1 rises inside the eccentric vertical hole 4b. The lubricating oil that has ascended through the eccentric vertical hole 4b is transferred to the auxiliary bearing 7. Oil is supplied to the main bearing 6 and drained into the back pressure chamber 20 through the respective bearing gaps. The lubricating oil that has reached the back pressure chamber 2o is injected into the working chamber formed by the fixed scroll 1 and the orbiting scroll 2 through the pores 2b and 2c, and is mixed with the refrigerant gas inside the scroll wraps 1b and 2b. mixed. Next, the lubricating oil together with the refrigerant gas is subjected to a pressure increasing action, and the discharge hole 14. It moves to the discharge chamber 16 and then to the motor chamber 18 via the communication passage 16,17. The lubricating oil that has reached the motor chamber 18 falls to the bottom of the closed container 1o due to its own weight. The fallen lubricating oil is collected again at the bottom of the closed container 1o and is supplied to lubricate each part.

In addition, a part of the lubricating oil discharged from the discharge hole 14 of the fixed scroll 1 accumulates in the oil reservoir 22 of the fixed scroll 1, and flows through the small hole 1b communicating with the end plate 1a of the fixed scroll 1 to the orbiting scroll 2. It falls into the annular groove 23 of the end plate part 2a, provides sliding lubrication for the end plate part 1a of the fixed scroll 1 and the end plate part 2a of the orbiting scroll 2, and the fixed scroll 1.
The lap portion of the orbiting scroll 2 is lubricated.

The problem that the invention aims to solve However, in the above configuration, the end plate portion 1a.

Since the lubrication of 2a is performed by the lubricating oil that has fallen into the annular groove 23, the end plate parts 1a and 2a that do not come into contact with the annular groove 23
lubrication becomes insufficient. Therefore, the mirror plate portions 1a and 2a wear unevenly, increasing mechanical loss and causing a decrease in EER (energy consumption efficiency).

Also, fixed scroll 1. End plate portion 2a of orbiting scroll 2
In order to supply oil to the lap portion, oil supply passages are required from two directions, one from the fixed scroll 1 and the other from the back pressure chamber 2o, resulting in a complicated structure and high cost.

The present invention is intended to solve these conventional problems, and provides a scroll compressor that can simultaneously lubricate the end plate portion and wrap portion of a fixed scroll and an orbiting scroll with a simple configuration. It is.

Means for Solving the Problems In order to solve the above-mentioned problems, the scroll compressor of the present invention has a scroll type compressor in which the end plate of the orbiting scroll has a scroll having one end opened to the back pressure chamber and the other end opened to the suction chamber. It has a shaped groove.

Function The present invention lubricates the end plates of the fixed scroll and the orbiting scroll by providing a spiral groove in the end plate of the orbiting scroll with one end opening to the back pressure chamber and the other end opening to the suction chamber. By supplying oil directly from the back pressure chamber and rotating the orbiting scroll, all parts of the end plate can be lubricated.

Embodiment Hereinafter, one embodiment of the scroll compressor of the present invention will be described with reference to the drawings (FIGS. 1 to 3). In addition,
In the figure, the same parts as in FIGS. 4 to 7 of the conventional example are designated by the same reference numerals.

In FIGS. 1 to 3, 24 is a spiral groove provided in the end plate 2a of the orbiting scroll 2, with one end opening to the back pressure chamber 20 and the other end opening to the suction chamber 12. .

In the scroll type thickening machine configured as above,
Since the pressure of the back pressure 20 communicates with the suction chamber 12 via the spiral groove 24 of the orbiting scroll 2, a pressure intermediate between the discharge pressure and the suction pressure acts.

Therefore, the lubricating oil 21 stored in the lower part of the closed container 10 is guided to the back pressure chamber 2o by the differential pressure, and further enters the suction chamber 12 via the spiral groove 24 of the orbiting scroll 2. Further, as the orbiting scroll 2 orbits, the lubricating oil 21 in the spiral groove 24 lubricates all parts of the fixed scroll end plate 1a and the orbiting scroll end plate 2a. The lubricating oil that has flowed into the suction chamber 12 is discharged from the discharge hole 14 while lubricating the scroll wrap, and falls to the lower part of the container 10 through the communication passages 16 and 17.

As described above, according to the present invention, by providing the spiral groove 24 in the end plate 2a of the orbiting scroll 2 with one end opening to the back pressure chamber 20 and the other end opening to the suction chamber 12, the fixed scroll 1. End plate portions 1a and 2a of orbiting scroll 2
All parts of the scroll can be lubricated and the scroll wrap can be lubricated.

Effects of the Invention As described above, the present invention improves the back pressure chamber by providing a spiral groove in the end plate of the orbiting scroll with one end opening to the back pressure chamber and the other end opening to the suction chamber. The lubricating oil is guided into the spiral groove of the end plate of the orbiting scroll by the differential pressure between the suction chamber and the orbiting scroll, which makes a rotating motion, lubricates all parts of the end plate, eliminating uneven wear on the end plate. EE
A decrease in R can be prevented.

Furthermore, since oil can be supplied to the end plate and the wrap at the same time, a complicated structure such as providing an oil reservoir in the fixed scroll is not required, resulting in cost reduction.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view of a scroll compressor showing an embodiment of the present invention, Fig. 2 is a plan view of the orbiting scroll shown in Fig. 1, and Fig. 3 is a view centered on the fixed scroll shown in Fig. 1. Figure 4 is a vertical cross-sectional view of a conventional scroll compressor.
Figure 6 is a cross-sectional view showing the meshing state of the scroll in Figure 4, Figure 6 is a plan view of the orbiting scroll in Figure 4, and Figure 7 is a longitudinal cross-section centered on the fixed scroll in Figure 4. It is a diagram. 1... Fixed scroll, 1a... Fixed scroll end plate, 2... Orbiting scroll, 2a
...... Orbiting scroll end plate, 10... Sealed container, 12... Suction chamber, 2o... Back pressure chamber, 24... Spiral shape groove. Name of agent: Patent attorney φ Toshio O and 1 other person/-
--Surface scroll l knee Eating turtle version 2-Turning scroll moo... End plate lθ-Akane Shuiyobo ldoichi--U and entering 3L 2θ-back, 7i! Figure 1 24-11 Whirlpool Port 4
Missing Groove - Fig. 2 Fig. 4 t-b Fig. 5

Claims (1)

[Claims] A fixed scroll having a spiral wrap on an end plate in a closed container, an orbiting scroll having a spiral wrap on an end plate that engages with the wrap, and a back pressure chamber formed on the side opposite to the wrap of the end plate of the orbiting scroll. A scroll type compressor, characterized in that a scroll-shaped groove is provided in the end plate of the orbiting scroll, with one end opening to a back pressure chamber and the other end opening to a suction chamber.