JPH04101094A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To cool the upper and lower parts of a motor uniformly by refrigerant gas and reduce lubricating oil carried outside a compressor by providing a duct opposed to communicating passages for communicating a delivery chamber with a motor chamber, an upper partition plate disposed above the motor, and a lower partition plate disposed below the motor. CONSTITUTION:A closed type scroll compressor is formed of a fixed scroll l and a turning scroll 2 that are compression element parts, an autorotation preventing member 3 for preventing the autorotation of the turning scroll 2, a main spindle 4, three bearing parts 5-7, a motor 8, the block 9 of a stationary member for fixing the fixed scroll 1, and the like, and enclosed in a closed container 10. A duct 25 is provided opposedly to the cutout 26 of the motor 8 and to communicating passages 16, 17 for communicating a delivery chamber 15 and a motor chamber 18 with each other. A lower partition plate provided with a sealed hole part 27a and a through hole part 27c having numerous through holes 27b, and an upper partition plate 28 provided with numerous through holes 28a are further disposed opposedly to the duct 25. The motor 8 is thereby cooled uniformly, and the separated oil is prevented from being remixed with refrigerant gas.

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 A conventional scroll compressor is disclosed in Japanese Patent Application Laid-Open No. 64-778, for example.
It is configured as shown in Publication No. 4. Here, a conventional example will be explained with reference to this publication and FIGS. 4 to 6. For ease of explanation, a solid line arrow indicating the flow direction of the actuating gun and a broken line arrow indicating the flow direction of the lubricating oil are inserted. FIG. 4 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 element parts, an anti-rotation member 3 and a main shaft 4 that prevent rotation of the orbiting scroll 2, and three bearings that support these, namely,
Slewing bearing 5, main bearing 6, auxiliary bearing 7, electric motor 8. It is composed of a stationary member block 9 for fixing the fixed scroll 1, 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 increases and it is discharged through the central discharge hole 14. The discharged high-temperature, high-pressure refrigerant gas is discharged into a discharge chamber 1 which is an upper space inside the closed container 10.
5 and communication channels 16, 17, it fills the motor compartment 18 and is led to the outside via a 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 pressure chamber 20 that counteracts the gas force in the slanut direction due to the 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 rotating Nukroll 2
Pores 2b and 2c are provided in the end plate 2a of the pores 2b and 2c.
, 2c, the gas inside the scroll that is in the middle of compression is introduced into the back chamber 20, and gas force is applied to the back surface of the orbiting scroll 2.

Next, the flow of lubricating oil will be explained.

The lubricating oil 21 is stored in an oil chamber 24 at the bottom of the closed container 10. The lower end of the main shaft 4 is immersed in the oil at the bottom of the closed container, and the upper part of the main shaft 4 is provided with an eccentric shaft portion 4a.
a is engaged with an orbiting scroll 2 which is a compression element portion via an orbit bearing 5.

The main shaft 4 has an eccentric vertical hole 4 for supplying oil to each bearing part.
b 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 5 is in an atmosphere of intermediate pressure Pm. Due to the pressure difference, the lubricating oil 21 at the bottom of the closed container flows through the eccentric vertical hole 4.
Rise within b. The lubricating oil that has ascended through the eccentric vertical hole 4b is transferred to the auxiliary bearing 7. The main bearing 6 is completely refilled with oil, and the pressure is exhausted to the back pressure chamber 20 through the respective bearing gaps. The lubricating oil that has reached the back pressure chamber 20 passes through the pores 2b and 2C to the fixed Nuclor 1.
The liquid is completely injected into the working chamber formed by the rotating Nuclor 2,
The refrigerant can be completely mixed with the refrigerant gaff inside the scroll wraps 1b and 2d. Next, the lubricating oil together with the refrigerant gas is subjected to the action of external pressure, and the discharge hole 14° and the discharge chamber 15. It roughly moves to the motor room 18 via communication passages 16 and 17. The lubricating oil that has reached the motor chamber 18 falls to the bottom of the closed container 10 due to its own weight.

The fallen lubricating oil is collected again at the bottom of the closed container 10 and is supplied to lubricate each part. 10a is a partition plate attached with a slight gap 10b around the outer periphery.

In the Nuclor type compressor configured as above,
The refrigerant gas and lubricating oil discharged from the discharge hole 14 of the fixed scroll 1 collide with the upper shell 22 of the closed container 1o, and the lubricating oil falls along the inner wall of the upper shell 22 and reaches the oil sump 23 of the fixed scroll 1. The oil is stored in the oil supply hole 1a to lubricate the end plate 2a of the orbiting scroll 2. When the refrigerant gas passes through the communication passages 16 and 17 and fills the motor chamber 18, it absorbs the heat generated by the motor, that is, cools the motor 8, and is led to the outside via the discharge pipe 19.

Problems to be Solved by the Invention However, in the above configuration, the communication path 16, i7
A portion of the refrigerant gas that fills the motor chamber 18 passes through the gap between the motor 8 and the closed container 1o to cool the lower part of the motor 8. At this time, the separated lubricating oil is separated from the partition plate 10a.
Since it drips onto the top and flies off, it is mixed into the gas again with the gas flow, and a large amount of lubricating oil is led to the outside along with the refrigerant gas, causing a decrease in the performance of the refrigerating system.

The present invention solves the above-mentioned conventional problems, and has a simple configuration. The upper and lower parts of the electric motor are uniformly cooled by the refrigerant gas discharged from the discharge hole. The present invention provides a scroll compressor that reduces the amount of lubricating oil taken out.

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention provides a communication path that connects a discharge chamber and a motor chamber located below the discharge chamber in the outer periphery of the block and the fixed scroll; A duct facing the passage, a notch facing the duct that communicates the motor chamber on the outer periphery of the motor with an oil chamber located below the motor room, and an upper partition plate having a large number of through holes above the motor. , a lower partition plate comprising a sealing part facing the duct and the notch below the electric motor, and a through-hole part having a large number of through-holes in other parts.

With this configuration, the refrigerant gas containing a large amount of lubricating oil discharged from the discharge hole collides with the peripheral wall etc. when passing through the discharge chamber and the motor room at high speed, and the lubricating oil is separated and the oil Flows down into the room. At this time, the lubricating oil that has reached the top of the upper partition plate immediately flows downward through the many through holes, and furthermore, the lubricating oil that has reached the top of the lower partition plate similarly flows down through the many through holes to the bottom of the closed container. Remixing with gas flowing through the upper layer of the upper partition plate and the upper layer of the lower partition plate is reduced. On the other hand, the gas that flows into the oil chamber together with the lubricating oil through the notch of the electric motor promotes separation of oil from the gas at the sealing part of the lower partition plate, reaches the through-hole part along with the gas flow, and seals the hole below the through-hole. It flows into the bottom of the container and prevents it from being remixed with the 9 gas. Furthermore, due to insufficient separation on the lower partition plate of the oil chamber, or due to bubbling of the lubricating oil accumulated at the bottom of the sealed container for some reason, the lubricating oil may leak into the refrigerant gas passing through the oil chamber. Even when remixed, the lubricating oil is separated by collision with the upper partition plate at the top of the motor, and only the refrigerant gas passes through the through holes in the upper partition plate and is discharged from the discharge pipe.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 4. Incidentally, the same parts as in the conventional example are given the same reference numerals, and the description thereof will be omitted.

In FIGS. 1 to 3, reference numeral 25 is a duct facing the communication path 16.degree. 17 and the notch 26 of the electric motor 8. 27
28 is a lower partition plate having a sealing part 27a facing the duct 25 and a through-hole part 27C having many other through-holes 27b, and 28 is an upper partition plate having many through-holes 28a.

In the above configuration, the refrigerant gas discharged from the discharge hole 14 of the fixed scroll 1 flows into the communication passage 16.1 as one flow.
7 and flows through the tact 25 mainly to the motor room 18 to cool the upper part of the motor 8, and as another flow to the duct 25.
The oil then flows through the notch 26 of the electric motor 8 to the oil chamber 24 to cool the lower part of the electric motor 8. Therefore, the upper and lower parts of the electric motor 8 can be uniformly cooled by the refrigerant gas.

Furthermore, the lubricating oil discharged from the discharge hole 14 on the fixed scroll 1 together with the refrigerant gas flows in almost the same manner as the refrigerant gas described above, but flows into the oil chamber 24 through the duct 26 and the notch 26 of the electric motor 8. The amount of lubricant increases. This lubricating oil collides with the sealing portion 27a of the lower partition plate 27, is separated from the refrigerant gas, flows down through the numerous through holes 27b, and is collected again at the bottom of the closed container 10.

Furthermore, the lubricating oil separated in the motor chamber 18 etc. flows smoothly into the oil chamber 24 through the many through holes 28a of the upper partition plate 28, and further flows through the many through holes 27b of the lower partition plate 27 into the closed container 10. is stored at the bottom of the

Furthermore, the lubricating oil that has flowed into the oil chamber 24 together with the refrigerant gas may not have been sufficiently separated, or the closed container 1o may
When the lubricating oil stored at the bottom remixes with the refrigerant gas passing through the oil chamber 24 due to bubbling or the like, the lubricating oil that has passed through the oil chamber 24 collides with the upper partition plate 28 and is separated from the refrigerant gas. It flows down to the oil chamber 24 under its own weight.

The refrigerant gas from which the lubricating oil has been separated passes through the numerous through holes 28a of the upper partition plate 28 and is fully discharged from the discharge pipe 19, reducing the amount of lubricating oil circulating through the refrigeration system.

Effects of the Invention As described above, the present invention provides a communication passage on the outer periphery of the block and the fixed scroll that communicates the discharge chamber with the electric motor chamber located below the discharge chamber, and a duct facing the communication passage;
A notch facing the duct that communicates the motor chamber with an oil chamber located below the motor chamber on the outer periphery of the motor; an upper partition plate having a large number of through holes above the motor; By providing a lower partition plate having a sealing part facing the duct and the notch and a large number of through holes in the other part, the electric motor can be cooled uniformly, thereby preventing motor burnout and improving reliability. The upper and lower partition plates have an oil separation effect and can prevent oil from being remixed into the refrigerant gas, reducing the amount of lubricating oil left outside the compressor and preventing a decline in the performance of the refrigeration system. At the same time, the lubricating oil inside the compressor can be secured, which has a great practical effect.

[Brief explanation of drawings]

Fig. 1 is a longitudinal sectional view of a Nuclor type compressor showing an embodiment of the present invention, Fig. 2 is a plan view of the upper partition plate in Fig. 1, and Fig. 3 is a plan view of the lower partition plate in Fig. 1. A plan view, FIG. 4 is a longitudinal sectional view of a conventional scroll compressor, FIG. 5 is a plan view of the scroll shown in FIG. 4, and FIG. 6 is a cross-sectional view showing the meshing state of the scrolls in FIG. It is. DESCRIPTION OF SYMBOLS 1...Fixed scroll, 8...Electric motor, 9...Block, 10...Airtight container, 15...Discharge chamber, 16.17. ...Communication path, 18...Motor room, 24...Oil chamber, 25...Duct, 26...Notch, 2
7...Lower partition plate, 27a...Sealing part, 2b...Through hole, 27c...Through hole part, 2
8...Upper partition plate, 28a...Through hole. Name of agent: Patent attorney Shigetaka Awano and 1 other person +
-Defined scroll? -Motivated by IMVi! Sq roll / 6.17- Connecting ♂ vessel 18- Figure 2 Nail 3e

Claims (1)

[Claims] a discharge chamber housing a block and an electric motor in a sealed container and located above a fixed scroll above the block;
The space is divided into three parts: an electric motor chamber located above the block and the electric motor, and an oil chamber in the space below the electric motor, and the discharge chamber and the electric motor chamber are connected to the outer periphery of the block and the fixed scroll. An upper part comprising a communication path, a duct facing the communication path, and a notch facing the duct that communicates the motor chamber and the oil chamber in the outer peripheral part of the electric motor, and having a large number of through holes above the electric motor. A scroll compressor comprising a partition plate, and a lower partition plate including a sealing part facing the duct and the notch below the electric motor, and a through-hole part having a large number of through-holes in other parts.