JPH02173377A - Scroll compressor - Google Patents

Abstract

PURPOSE:To suck lubricating oil of a back pressure chamber out to a duct for delivery gas through utilization of a venturi action and to prevent the lubricating oil in the back pressure chamber from flowing in a closed space by a method wherein the back pressure chamber of a revolving scroll and the duct for delivery gas are interconnected through a communicating pipe. CONSTITUTION:Low temperature low pressure refrigerant gas is introduced through a suction pipe 11 to a suction chamber 12 of a fixed scroll, and after the refrigerant gas is gradually compressed in a closed space along with revolution of a revolving scroll 2, it is delivered through a delivery hole 14. After a delivery chamber 15 and communicating passages 16 and 17, a duct 18, and an electric motor chamber 19 are filled with delivered high temperature high pressure refrigerant gas, the refrigerant gas is lead out through a delivery pipe 20. In this case, a back pressure chamber 21 surrounded with the back of the revolving scroll 2 and a block 9 is connected to the duct 18 through a communicating pipe 23. When delivered gas flows through the duct 18, a venturi action is created, lubricating oil in the back pressure chamber 21 is discharged in the duct 18. This constitution prevents lubricating oil in the back pressure chamber 21 from flowing in the closed space.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a scroll compressor as a refrigerant compressor.

Conventional technology The basic structure, lubrication method, etc. will be explained with reference to FIGS. 2 and 3. In order to simplify the 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 included. FIG. 2 shows an overall configuration diagram of a conventional hermetic scroll compressor for an air conditioner. The compressor has a fixed sourflow/l which is a compression element part.
Both the scrolls /1 and orbiting SFlow /l/2, the Oldham ring 3 and main shaft 4 that prevent rotation of the orbiting scroll 2, and the three bearings that support them, namely, the orbiting bearing 6, the main bearing 6, and the auxiliary bearing. 7, an electric motor 8, and a stationary member block 9 for fixing the fixed scroll 1.

These components are housed inside the closed container 10.

Explain the operation of the double compressor 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 in the fixed flow (v1). As shown in FIG. 3, the refrigerant gas that has reached the compression element is moved into a closed space 13a formed by both scrolls due to the revolving movement of the orbiting scroll 2, which is prevented from rotating.

As the refrigerant gas gradually shrinks and moves to the center of the scroll, the refrigerant gas increases its pressure and flows through the central discharge hole 1.
It is discharged from 4. The discharged high-temperature, high-pressure refrigerant gas is discharged into a discharge chamber 15. which is an upper space within the closed container 10. and a communication path 1 provided in the fixed neck/l/1 and the block 9.
6.17 Further, below the communication path 17, the air fills the motor room 19, which is a space for the motor, through a duct 18 fixed to the airtight container 10, and is led to the outside via the discharge pipe 20.

On the other hand, the back of the rotating flow/I/2 and the block 9 surround 1.
A pressure between the suction pressure and the discharge pressure acts on the back pressure chamber 21 in the closed space in order to counter the gas force in the nullust direction due to the gas pressure in the plurality of closed spaces formed by both rotating and fixed scrolls. do. To set this intermediate pressure, small holes 2b and 2c are provided in the end plate 2a of the rotating Nucrow/l/2, and the gas inside the scroll during compression is transferred to the back pressure chamber 2 through the small holes.
1 and apply gas force to the back surface of the swirling flow/l/2.

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, which is connected to the orbiting scroll portion 2, which is a scroll compression element portion, via an orbiting bearing 5. engaged. The main shaft 4 is formed with an eccentric vertical hole 4a extending 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 22 is in an atmosphere of high discharge pressure (Pd), while the area around the downstream swing bearing 5 is in an atmosphere of intermediate pressure (Pm).
-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. Oil is supplied to the main bearing 6 and the swing bearing 5, and flows into the back pressure chamber 21 through the respective bearing gaps.

The lubricating oil that has reached the back pressure chamber 21 flows into the working chamber formed by both scrolls/l/1.2 through the small holes 2b and 2c, and inside the Nuchlor lamp, the lubricating oil flows into the working chamber formed by the two scrolls/l/1.2. mixed with. Next, the lubricating oil is subjected to pressure action along with the refrigerant gas, and the discharge hole 14. Discharge chamber 15 and communication passage 16.
17 and duct 18 to the motor room 195 vane. The lubricating oil that has reached the motor chamber 19 falls to the bottom of the container 1Q due to its own weight, and is again stored at the bottom of the container and used to lubricate each part.

Problems to be Solved by the Invention However, with the above configuration, when the pressure in the back pressure chamber becomes higher than the pressure in the closed space, the liquid (lubricating oil)
flows into the closed space from the back pressure chamber through the pores provided in the orbiting scroll. Especially when starting the compressor,
A large amount of refrigerant dissolved in the lubricating oil will bump into the back pressure chamber, so the pressure in the back pressure chamber will be higher than the pressure in the closed space, and a large amount of lubricating oil will flow into the closed space. The problem with liquid compression was that it caused the compressor to malfunction.

In view of the above problems, the present invention provides fluid (lubricating oil) in the back pressure chamber.
To provide a scroll compressor that can prevent compressor failure due to oil compression from flowing into a closed space.

Means for Solving the Problems In order to solve the above problems, the present invention provides a back pressure chamber with one end connected to the back pressure chamber.
A communicating pipe is provided with the other end connected to a duct inside a closed container.

Function The present invention provides a communication pipe between the back pressure chamber and the duct, so that a venturi effect occurs when the discharged gas flows through the duct, and the fluid (lubricating oil) in the back pressure chamber flows inside the duct. Therefore, the pressure in the back pressure chamber can be lowered and an appropriate pressure can be maintained without fluid (lubricating oil) flowing into the closed space.

Embodiment Hereinafter, a Nuclor compressor according to an embodiment of the present invention will be described with reference to the drawings, but the same components as those of the conventional one will be given the same reference numerals and detailed explanations thereof will be omitted.

FIG. 1 shows a cross section of a scroll compressor in an embodiment of the present invention, and 23 is a communication pipe provided between the back pressure chamber 21 and the duct 18.

As described above, according to this embodiment, by connecting one end of the communication pipe to the discharge gas distribution duct, a venturi effect is generated due to the flow of the discharge gas, and the inside of the back pressure chamber passes through the seven-page communication pipe. By sucking out the lubricating oil as a fluid, the pressure in the back pressure chamber can be lowered, and fluid compression, which prevents the lubricating oil in the single pressure chamber from flowing into the closed space in large quantities, can be prevented.

Effects of the Invention As described above, in the present invention, by providing a communication pipe between the back pressure chamber and the discharge gas duct, a venturi effect occurs due to the flow velocity of the discharge gas, and the lubricating oil in the back pressure chamber is sucked out. It will be done. Therefore, even if the pressure in the back pressure chamber becomes higher than the pressure in the closed space, the lubricating oil in the back pressure chamber will not flow into the closed space, and failure of the compressor due to liquid compression can be prevented.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a scroll compressor showing an embodiment of the present invention, Fig. 2 is a sectional view of a conventional scroll compressor, and Fig. 3 is a sectional view of a conventional scroll compressor.
The figure is a cross-sectional view showing the engaged state of the scrolls. 1... Fixed scroll, 2... Rotating scroll, 3... Oldham ring, 9... Block, 18... Duct, 21... Back pressure chamber, 23... Communication pipe.

Claims (1)

[Scope of Claims] A fixed scroll having a spiral wrap on its end plate and an orbiting scroll are engaged with each other with the wraps facing each other, and the orbiting scroll makes an orbiting motion relative to the fixed scroll while being prevented from rotating, A back pressure chamber is provided on the surface opposite to the wrap of the orbiting scroll, and a communication pipe is provided in the back pressure chamber, one end of which is connected to a discharge gas duct. scroll compressor.