JPS63138187A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent drop of EER by providing an outward stretching and an inward stretching groove at ring-shaped groove formed on the mirror plate of a revolving scroll, and giving the passage resistance of the groove in the inside direction a greater value than the passage resistances of said ring-shaped groove and the groove in outside direction. CONSTITUTION:Grooves 24, 25 stretching outward and inwards are provided in a ring-shaped groove 23 formed in the mirror plate 2a of a revolving scroll 2, wherein the passage resistance of the groove 25 is given a greater value than the ring-shaped groove 23 and the outward stretching groove 24. Thereby the oil in a back pressure chamber 20 is led to a suction chamber 12 from the outward stretching groove 24 via said ring-shaped groove 23 and inward stretching groove 25 through the action of differential pressure with respect to this suction chamber 12, which enables oil supply to the mirror plate 2a from back pressure chamber 20 in a short while after of operation. Therefore, EER (energy consuming efficiency) can be prevented from dropping due to increase in the mechanical loss.

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.

Conventional technology The basic structure, lubrication method, etc. will be explained with reference to FIGS. 4 to 6. In addition, for ease of explanation, solid line arrows indicating the flow direction of the working gas and broken line arrows indicating the flow direction of the lubricating oil are shown as such. FIG. 4 shows an overall configuration diagram of a conventional hermetic scroll compressor for an air conditioner. The compressor consists of a fixed scroll 1 and an orbiting scroll 20 which are compression element parts, 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.

These components are housed inside the closed container 1o.

The flow of refrigerant gas will be explained.

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 is moved into a closed space 13a formed by both scrolls due to the orbital movement of the orbiting scroll 2, which is prevented from rotating.

As the refrigerant gas 13b gradually contracts and moves to the center of the scroll, the pressure of the refrigerant gas is increased and the refrigerant gas is discharged from the central discharge hole 14. The discharged high-temperature, high-pressure refrigerant gas flows into the space 18 around the electric motor via the 15° gap between the containers in the closed container 10 and the communication passage 18. , filled and led to the outside via the discharge pipe 19.

On the other hand, in the back pressure chamber 2o of the space surrounded by the back surface of the orbiting scroll 2 and the block 9, both the orbiting and fixed scrolls 1,
In order to counter the gas force in the thrust direction due to the gas pressure in the plurality of sealed spaces formed by 2, a pressure intermediate between the suction pressure and the discharge pressure acts.

This intermediate pressure is set by providing small holes 2b and 2a in the end plate 2a of the orbiting scroll 2, and guiding the gas inside the scroll which is in the middle of compression to the back pressure chamber 2o through these holes. It is done by applying force.

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, and the upper part of the main shaft is provided with an eccentric shaft portion 4a, which engages with the orbiting scroll 2, which is a scroll compression element portion, via an orbiting bearing 5. are doing. In the main shaft 4, an eccentric vertical hole 4a for supplying oil to each bearing section is formed from the lower end of the main shaft to the upper end surface of the main shaft. 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 rotation of the downstream swing bearing 6 is in an atmosphere of intermediate pressure (Pm). ) The lubricating oil 21 at the bottom of the container 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. Main bearing 6 and slewing bearing 5
is supplied with oil and guided to the back pressure chamber 2o through the respective bearing gaps. The lubricating oil that has reached the back pressure chamber 20 flows through the pores 2b.
, 2a into the working chamber formed by both scrolls 1 and 2, and mixed with the refrigerant gas inside the scroll wrap. Next, the lubricating oil along with the refrigerant gas is subjected to a pressure increasing action, and the discharge hole 14. Discharge chamber 16 and communication passage 16.
17 and then moves to the motor room 18. On the 1st day, the lubricating oil in the motor room falls to the bottom of the container 10 due to its own weight.
It is stored at the bottom of the container again and used to lubricate various parts.

Further, a part of the lubricating oil discharged from the discharge hole 14 of the fixed scroll 1 falls into the annular groove 23 of the end plate portion 2a of the orbiting scroll 2 through the pore 1b communicating with the end plate 1a of the fixed scroll 1. Sliding lubrication is performed on the end plate portion 2a of the orbiting scroll 2, and the fixed scroll 1. The lap portion of the orbiting scroll 2 is lubricated.

Problems to be Solved by the Invention However, in the above configuration, the end plate portion 2a is lubricated through the pores 1b of the oil reservoir portion 22 of the fixed scroll 1. Lubrication is possible only after lubricating oil has accumulated. Therefore, the wear of the end plate portion 2a is large, which increases mechanical loss and causes a decrease in EER (energy consumption efficiency).

In addition, in order to supply oil to the end plate part 2a and the wrap part of the orbiting scroll 2, oil supply passages from two directions, from the fixed scroll 1 and from the back pressure chamber 20, are required, and the structure is complicated.
The cost was high.

The present invention solves these conventional problems and provides a scroll compressor that can simultaneously lubricate the end plate portion and wrap portion of the orbiting scroll with a simple configuration.

Means for Solving the Problems In order to solve the above-mentioned problems, the scroll compressor of the present invention provides one or more grooves in the outer direction and the inner direction in the annular groove on the orbiting scroll end plate. The passage resistance of the groove is made larger than that of the annular groove and the passage resistance in the outward direction.

Function: The present invention provides one or more grooves in the outer and inner directions of the annular groove on the orbiting scroll plate, and makes the passage resistance of the inward groove better than the passage resistance of the annular groove and the outer groove. By increasing the size of the head plate of the orbiting scroll, the head plate of the orbiting scroll can be lubricated directly from the back pressure chamber, and the head plate can be lubricated quickly after the start of operation, reducing wear on the head plate and improving EE.
A decrease in R can be prevented.

Embodiment Hereinafter, one embodiment of the scroll compressor of the present invention will be described with reference to the drawings (FIGS. 1 to 3).

1 to 3, 24 is a groove provided toward the outside of the annular groove 23 of the end plate 2a of the orbiting scroll 2, and 25 is a groove provided toward the inside of the annular groove 23. The passage resistance is caused by the annular groove 23 and the outward groove 2.
40 passage resistance, the end of the groove 26 is located in the suction chamber 12.

In the scroll compressor configured as above,
The pressure in the back pressure chamber 20 is determined by the outer groove 24 and the inner groove 25f of the annular groove 23 of the orbiting scroll 2.

Since it communicates with the suction chamber 12 through the passageway, 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 1o is guided to the back pressure chamber 2o by the differential pressure, and is further guided to the groove 24 on the outside of the orbiting scroll 2. It enters the suction chamber 12 via the annular groove 23 and the inner groove 26. In addition, the passage resistance of the inner groove 250 is the same as that of the annular groove 23 and the outer groove 24.
Because it is larger than the passage resistance of the orbiting scroll end plate 2
A is always refueled. The lubricating oil that has flowed into the suction chamber 12 is discharged from the discharge hole 14 while lubricating the scroll wrap, passes through the communication passages 1e and 17f, and falls to the lower part of the container 10.

As described above, according to the present invention, by providing the outer groove 24 and the inner groove 26 in the annular groove 23 of the end plate 2a of the orbiting scroll 2, the oil supply lubrication of the end plate 2a of the orbiting scroll 2 and the scroll wrap Perform oil lubrication.

Effects of the Invention As described above, the present invention provides grooves in the outward and inward directions in the annular groove on the end plate of the orbiting scroll, so that the passage resistance of the outward groove is higher than the passage resistance of the annular groove and the inward groove. Due to the pressure difference between the back pressure chamber and the suction chamber, the oil in the back pressure chamber is guided from the outer groove to the suction chamber through the annular groove of the end plate and the inner groove, so that the oil from the back pressure chamber is Since the end plate can be refueled in a short time after the start of operation, there is an effect of preventing a decrease in EER due to an increase in mechanical loss.

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.
6 is a cross-sectional view showing the engaged state of the scrolls in FIG. 4, and FIG. 6 is a longitudinal sectional view centering on the fixed spacer shown in FIG. 4. 1... Fixed scroll, 1a... Fixed scroll end plate, 2... Orbiting scroll, 2a
......Orbiting scroll end plate, 23...Annular groove, 24...Outward groove, 26...
・Inward groove. Name of agent: Patent attorney Toshio Nakao and 1 other person11
Figure /- Demarcation scroll Figure 2 Figure 3

Claims (1)

[Claims] A fixed scroll having a spiral wrap on the end plate and an orbiting scroll having a spiral wrap on the end plate are engaged with each other with their wraps facing each other, and the orbiting scroll makes an orbital motion so as not to apparently rotate relative to the fixed scroll. , which compresses gas, and has grooves in the outer and inner directions in the annular groove on the end plate of the orbiting scroll, so that the passage resistance in the inward groove is greater than the passage resistance in the annular groove and the lateral grooves. A scroll compressor featuring: