JPS62182487A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the abrasion on the surface of an end plate outer periphery at the start of an operation and the occurrence of a resultant mechanical loss by forming an annular groove on the operating chamber side surface of the end plate outer periphery of a rotary scroll and communicating multiple grooves extended to the outside and the inside in the radial direction to this annular groove. CONSTITUTION:An annular groove 23 is formed on the operating chamber side surface of the outer periphery of the end plate 2a of a rotary scroll 2, and multiple grooves 24, 25 extended to the outside and the inside in the radial direction are communicated to this annular groove 23. According to this constitution, the oil in the back pressure chamber 20 of the rotary scroll 2 is easily guided to the annular groove 23, the groove 25 and an intake chamber via the groove 24, thus no oil exhaustion occurs on the outer periphery of the end plate 2a at the start of an operation of a scroll compressor, and the abrasion on this portion is reduced and a mechanical loss is also reduced.

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 includes both scroll members, a fixed scroll member 1 and an orbiting scroll member 2, which are compression element parts, and an orbiting scroll member 2.
an anti-rotation member 3 and a main shaft 4, three bearings that support it, that is, a swing bearing 6, a main bearing 6, an auxiliary bearing 7, an electric motor 8, and a stationary block 9 that fixes the fixed scroll 1. Consists of etc. These components are housed inside the closed container 1o.

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

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 fills a space 18 corresponding to the electric motor 1 through the 15° gap between the containers in the closed container 10 and the communication passages 16 and 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 counters the gas force in the thrust direction due to the gas pressure in a plurality of sealed spaces formed by both the orbiting and fixed scrolls. Therefore, a pressure between suction pressure and discharge pressure acts. To set this intermediate pressure, small holes 2b and 2ci are provided in the end plate 2a of the orbiting scroll 2, and gas inside the scroll which is being compressed is guided to the back pressure chamber 20 through these holes, and gas pressure is applied to the back of the orbiting scroll 2. This is done by applying

Next, the flow of lubricating oil will be explained.

The lubricating oil 21 is stored in the lower part of the closed container 10.

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.
is engaged with. The main shaft 4 has an eccentric vertical hole 4a 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), and the area around the downstream swing bearing 5 is in an atmosphere of intermediate pressure (Pm), so that (Pd - Pm ) The lubricating oil 21 at the bottom of the container rises inside the eccentric vertical hole 4b due to the pressure difference. 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 then to the slewing bearing 6, passing through each bearing gap to the back pressure chamber 2.
Oil is drained to o. The lubricating oil that has reached the back pressure chamber 20 is injected into the working chamber formed by both scrolls 1 and 2 through the pores 2b and 2c, and is 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. The discharge chamber 16 then moves to the motor chamber 18 via a communication passage 16,17.

The lubricating oil that has reached the motor chamber 18 falls to the bottom of the container 1o due to its own weight, and is again collected at the bottom of the container and used to lubricate each part.

In the scroll compressor configured as described above, 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 pores 1a to the orbiting scroll 2. Annular groove 2 of end plate part 2a of
3, and performs sliding lubrication of the end plate portion 2a of the orbiting scroll 2.

Problems to be Solved by the Invention However, in the above configuration, since the end plate portion 2a is lubricated through the pores 1a of the oil reservoir portion 22 of the fixed scroll 1, no oil is supplied to the oil reservoir portion 22 after starting operation. Lubrication is possible only after lubricating oil has accumulated. Therefore, the abrasion of the end plate portion 2a increases, increasing mechanical loss and causing a decrease in HER (energy consumption efficiency).

Furthermore, 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 are required, one from the fixed scroll 1 and the other from the back pressure chamber 2Q, which makes the structure 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 problems, one or more grooves are provided on the outer peripheral side and inside of the orbiting scroll annular groove of the present invention.

Effect The present invention provides one or more grooves on the outer circumferential side and inside of the annular groove of the orbiting scroll, so that the end plate portion of the orbiting scroll can be lubricated directly from the back pressure chamber. This allows for early refueling after the start of operation, reduces wear on the end plate, prevents a drop in EER, and reduces costs.

Embodiment An embodiment of the scroll compressor of the present invention will be described below with reference to the drawings (FIGS. 1 to 3). In the figure, the same parts as in FIGS. 4 to 6 of the conventional example are designated by the same reference numerals.

In FIG. 1, 24 is a groove provided toward the outer circumferential direction of the annular groove 23 of the end plate 2a of the orbiting scroll 2;
25 is a groove provided toward the inside of the annular groove 23, and the end of the groove 26 is located in the suction chamber 12.

In the scroll compressor configured as described above, the pressure in the back pressure chamber 20 is communicated with the suction chamber 12 via the outer circumferential groove 24 and inner groove 25 of the annular groove 23 of the orbiting scroll 2. A pressure intermediate between pressure and 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 2Q by the differential pressure, and is further guided to the outer circumferential groove 24 of the orbiting scroll 2. It enters the suction chamber 12 via the annular groove 23 and the inner groove 26. 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 annular groove 23 of the end plate 2a of the orbiting scroll 2 with the groove 24' in the outer circumferential direction and the groove 25 in the inward direction, the orbiting scroll 2
The end plate portion 2a and the scroll wrap can be lubricated with oil.

Effects of the Invention As described above, the present invention provides grooves in the outer circumferential direction and inward direction in the annular groove of the end plate portion of the orbiting scroll.
The oil in the back pressure chamber is guided from the outer circumferential groove to the suction chamber through the annular groove of the end plate and the inner groove due to the differential pressure with the suction chamber, so oil supply from the back pressure chamber to the end plate begins. Since it can be carried out in a short time, it is possible to reduce E due to increased mechanical loss.
This has the effect of preventing a decrease in ER.

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 drawings]

Fig. 1 is a vertical sectional view of a hermetic 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 centering view of the fixed scroll shown in Fig. 1. Figure 4 is a vertical cross-sectional view of a conventional hermetic scroll compressor, Figure 6 is a cross-sectional view showing the meshing state of the scrolls, and Figure 6 is a vertical cross-sectional view centered on the fixed scroll. be. 1... Fixed scroll, 2... Orbiting scroll, 2a... End plate, 23... Annular groove, 24... Outward groove, 25...
・Inward groove. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
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. A scroll compressor for compressing gas, characterized in that an annular groove on an end plate of an orbiting scroll is provided with grooves in an outward direction and an inward direction.