JPS63201395A - Scroll compressor - Google Patents

Abstract

PURPOSE:To enable a compressor to decrease an outflow amount of oil to a system from an electric motor chamber through a delivery pipe, by providing a small duct between a duct, fixed to an enclosed vessel, and the enclosed vessel. CONSTITUTION:Refrigerant gas, which is delivered from a delivery hole 14 containing lubricating oil, is separated into a refrigerant and oil in a delivery chamber 15, and a compressor allows the oil to flow along a wall of an enclosed vessel 10 and the refrigerant gas to flow moving in the inner side from the oil. The refrigerant passes through a communication path 16 of a fixed scroll 1, communication path 17 of a block 9 and a duct 18 position in the bottom part of the communication path 17 being introduced to an electric motor chamber 19, but here the oil, which is disturbed by a small duct 23 positioned between the duct 18 and the enclosed vessel 10, is prevented from being guided to the electric motor chamber 19 by the attraction of the refrigerant. Accordingly, the oil, which is prevented from being attracted to the refrigerant allowed to flow into a system via a delivery pipe 20 from the electric motor chamber 19, drops down to the bottom part of the enclosed vessel 10.

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. 3 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. 3 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 Oldham ring 3 and a main shaft 4 that prevent rotation of the orbiting scroll 2, and three bearings that support the scrolls, 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 10.

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. 4, 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 through the central discharge hole 14. The discharged high-temperature, high-pressure refrigerant gas is discharged into the discharge chamber 16. which is the upper space within the closed container 1o. Communication passages 16 and 17 provided between the fixed scroll 1 and the block 9 are further connected to a motor room 1 which is a space for the electric motor through a duct 18 fixed to the airtight container 10 below the communication passage 17.
9 and is led to the outside via the discharge pipe 2o.

On the other hand, a back pressure chamber 21 in a space surrounded by the back surface of the orbiting scroll 2 and the block 9 has a 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. This intermediate pressure is set by providing small holes 21) and 2c in the end plate 2a of the orbiting scroll 2, and guiding the gas inside the scroll which is being compressed into the back pressure chamber 21 through the fine holes. This is done by applying gas force to the

Next, the flow of lubricating oil will be explained.

Lubricating oil 22 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.
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, which is immersed in the lubricating oil 22, 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), so that (Pd-Pm) ) The lubricating oil 22 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. The main bearing 6 is further supplied with oil to the slewing bearing 6, and passes through the respective bearing gaps to the back pressure chamber 21.
Oil is drained to. The lubricating oil that has reached the back pressure chamber 21 is injected into the working chamber formed by both scrolls 1 and 2 through the pores 2b and 20, 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 lubricating oil is discharged from the discharge hole 14. The discharge chamber 16 further passes through communication channels 16, 17 and ducts 18 into the motor chamber 19. The lubricating oil that has reached the motor chamber 19 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, refrigerant gas containing lubricating oil discharged from the discharge hole 14 of the fixed scroll 1 is separated into refrigerant and oil in the discharge chamber 16, and the fixed scroll 1 and the block are separated into refrigerant and oil. Communication path 1 provided in 9
6.17 and the duct 18 to the motor room 19, but since the oil has a higher specific gravity than the refrigerant gas, it flows along the 1° wall of the sealed container, and the refrigerant moves closer to the center than the oil. I will do it.

Problems to be Solved by the Invention However, in the above configuration, since the flow rate of the refrigerant flowing through the duct 18 is high, there is no flow from the duct 18 to the motor room 19.
The oil is sucked into the refrigerant flowing into the container 1o.
The refrigerant fills the motor chamber 19 together with the refrigerant without falling to the bottom of the refrigerant, and flows out into the system via the discharge pipe 20. Therefore, the amount of lubricating oil at the bottom of the container 1o decreases, resulting in insufficient lubrication due to the small amount of lubricating oil, increasing wear on the sliding part Q and increasing mechanical loss): This causes a decrease in ER (energy consumption efficiency). It is the cause.

The present invention solves these conventional problems and provides a scroll compressor that can reduce the amount of oil flowing out from the motor room to the system via the discharge pipe with a simple configuration. It is.

Means for Solving the Problems In order to solve the above problems, the present invention provides a small duct between a duct fixed to the closed container and the closed container.

Function: By providing a small duct between the duct and the airtight container, the present invention prevents oil from being sucked into the refrigerant flowing from the duct into the motor room, and the oil falls to the bottom of the airtight container. Therefore, it is possible to prevent a decrease in the amount of lubricating oil, reduce wear on the sliding parts, and prevent a decrease in EER.

Embodiment Hereinafter, one embodiment of the scroll compressor of the present invention will be described with reference to the drawings (FIGS. 1 and 2). In the figure, the same parts as in FIGS. 3 to 6 of the conventional example are designated by the same reference numerals.

In FIG. 1, 23 is a small duct provided between the duct 18 and the closed container 10.

In the scroll compressor configured as described above, the refrigerant gas containing lubricating oil discharged from the discharge hole 14 is separated into refrigerant and oil in the discharge chamber 16, and the oil has a specific gravity compared to the refrigerant gas. Because it is heavy, it flows along the wall of the closed container 1o,
Also, the refrigerant gas moves inside the oil tank. The refrigerant and oil are guided to the motor room 19 through the communication path 617 of the fixed scroll 1 and the block 9 and the duct 18 located below it, but as the refrigerant flows into the motor room 19, Since the oil is blocked by the small duct 23 located between the duct 18 and the closed container 1o, the oil is not attracted by the refrigerant and led to the motor room 19, but passes between the closed container 10 and the motor 8 and flows into the closed container 1o. It falls to the bottom.

Therefore, the oil is not sucked into the airtight container 1 by the refrigerant flowing out from the motor room 1e to the system via the discharge pipe 2o.
0 falling to the bottom.

As described above, according to the present invention, the duct 18 and the closed container 1
Since the lubricating oil 22 at the bottom of the closed container 10 does not decrease by providing the small duct 23 between the ducts 23 and 23, the sliding parts can be sufficiently lubricated with oil.

Effects of the Invention As described above, in the present invention, by providing a small duct between the duct and the sealed container, the discharge chamber fills the motor room through the communication path and the duct, and flows out to the cycle 1 cycle. Since oil is not sucked into the refrigerant and the lubricating oil stored at the bottom of the sealed container does not decrease, the sliding parts are sufficiently lubricated, reducing gER due to increased mechanical loss.
This has the effect of preventing a decline in

[Brief explanation of the drawing]

FIG. 1 is a vertical sectional view of a hermetic scroll compressor showing an embodiment of the present invention, and FIG. 2 is the same as that shown in FIG. 1. -14? Figure 3 is a vertical cross-sectional view of a conventional hermetic scroll compressor, and Figure 4 is a top view.
The figure is a cross-sectional view showing the meshing state of the scrolls, and FIG. 6 is a cross-sectional view taken along the line -■ in FIG. 3. 1... Fixed scroll, 2... Rotating scroll, 3... Oldham ring, 9... Group...
Block, 10... Airtight container, 16.17...
...Communication path, 18...Duct, 23...
...Small duct. Name of agent: Patent attorney Toshio Nakao and one other person
m constant scroll 2""" orbiting scroll 3-Holder ring No. 1 m 9-Ralo, ri @2 diagram

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 rotates through the Oldham ring so as not to rotate, thereby compressing the gas. This system has a duct fixed to a sealed container below the fixed scroll and a communication passage provided in the block that fixes the fixed scroll, and a small duct is provided between the duct and the sealed container. A scroll compressor characterized by: