JPS63192984A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To prevent a lubricating oil which is discharged out of a discharge port from easily flowing into a communicating passage by installing a discharge cover which is opened on a side opposite to the communicating passage on the upper part of the discharge port of a fixed scroll. CONSTITUTION:A refrigerant gas and a lubricating oil which are discharged out of the discharge port 14 of a fixed scroll 1 change their flowing directions due to a discharge cover 24 which is opened on the side opposite to communicating passages 16, 17, and collide against the inner wall of an enclosed container 10. And, the lubricating oil which is separated at the time of this collision falls along the inner wall of the enclosed container 10. The refrigerant gas also changes its direction from the colliding part toward the communicating passages 16, 17. Therefore, the separation between the refrigerant gas and the oil can be more completely carried out while causing more lubricating oil to fall down to the part on the opposite side to the communicating passages 16, 17, to reduce the flow of the lubricating oil into the communicating passages 16, 17. Accordingly, since the quantity of oil collected in the oil sump 23 of the fixed scroll 1 is also increased, the reduction in energy consumption efficiency (EER) due to increase in machine loss and the seizing of a sliding part can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application 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. For ease of explanation, the flow direction of the working gas is shown by a solid line arrow, and the flow direction of lubricating oil is shown by a broken line arrow. FIG. 3 shows the overall configuration of a conventional hermetic scroll compressor for air conditioners. 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, etc., and these components are housed inside a 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 fills the space 18 of the electric motor machining machine via the discharge chamber 15 in the closed container 1o and the communication passage 16, 17, and is led to the outside via 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. This intermediate pressure setting is carried out through small holes 2b and 2c in the mirror surface 2a of the orbiting scroll 2.
The gas inside the scroll which is being compressed is introduced into the back pressure chamber through this narrow diameter, and the gas force is applied to the back surface of the orbiting scroll 2.

Next, the flow K 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 section 4a, which engages with the orbiting scroll 2, which is a scroll compression element section, via an orbiting bearing 6. are doing. The main shaft 4 has an eccentric vertical hole 4b 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), while the area around the downstream swing bearing 6 is in an atmosphere of intermediate pressure (Pm). -Pm The lubricating oil 21 at the bottom of the closed container rises inside the eccentric vertical hole 4b due to the pressure difference.
The lubricating oil that has risen is supplied to the auxiliary bearing 7 and the main bearing 6, and is discharged to the back pressure chamber 20 through the respective bearing gaps.

The lubricating oil that has reached the back pressure chamber 20 is injected into the working chamber formed by the fixed scroll 1 and the orbiting scroll 2 through the pores 2b and 2C, and is mixed with the refrigerant gas inside the scroll wraps 1b and 2d. mixed. Next, the lubricating oil is pressurized together with the refrigerant gas, and moves to the motor chamber 18 through the discharge hole 14, the discharge chamber 15, and the communication passages 16 and 17. The lubricating oil that has reached the motor room 18 is placed in a closed container 1 due to its own weight.
It falls to the bottom of o. The fallen lubricating oil is collected again at the bottom of the closed container 1o and is supplied to lubricate each part.

In the scroll compressor configured as described above, the refrigerant gas and lubricant oil discharged from the discharge hole 14 of the fixed scroll 1 collide with the upper shell 22 of the closed container 10, and the lubricant oil flows along the inner wall of the upper shell 22. The oil falls, is collected in the oil reservoir 23 of the fixed scroll 1, and lubricates the end plate 2& of the orbiting scroll 2 through the pores 1a. Since the refrigerant gas heads toward the communication passages 16 and 17, the direction of the gas flow is changed. In this manner, the refrigerant gas and oil are separated in the discharge chamber 15 by the effect of their collision and the effect of direction change.

Problems to be Solved by the Invention However, in the above configuration, the fixed scroll 1
Even if the refrigerant gas and lubricating oil discharged from the discharge hole 14 collide with the upper shell 22, the lubricating oil falls along the inner wall of the upper shell 22, so that the refrigerant gas and lubricating oil discharged from the discharge hole 14 of The lubricating oil that has fallen along the inner wall falls into the motor room 18 through communication passages 16 and 17 together with the refrigerant gas. A portion of the lubricating oil that has fallen is mixed with the refrigerant gas and discharged from the discharge pipe 19 to circulate through the system. Therefore, especially in a system with poor oil return 9, the lubricating oil 21 in the closed container 1o decreases, and the amount of oil accumulated in the oil sump 23 of the fixed scroll 1 also decreases, which increases mechanical loss and reduces EER. This not only reduces energy consumption efficiency but also causes seizure of sliding parts.

The present invention solves these conventional problems, and provides a scroll compressor with a simple configuration that prevents lubricating oil discharged from the discharge hole from easily flowing into the communication path. .

Means for Solving the Problems In order to solve the above-mentioned problems, the present invention is such that a discharge cover is provided above the discharge hole of the fixed scroll, the discharge cover opening to the side opposite to the communication path.

Function The present invention secures the amount of oil in the oil reservoir of the fixed scroll and reduces the amount of oil circulating in the system by installing a discharge cover that opens on the opposite side of the communication path to the upper part of the discharge hole of the fixed scroll. This prevents a decrease in EER and seizure of sliding parts.

EXAMPLE An example of the present invention will be described below with reference to FIGS. 1 and 2. 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 and 2, reference numeral 24 denotes a discharge cover that opens to the opposite side of the communication path 16 and 17.

In the scroll type compressor configured as above, the refrigerant gas and lubricating oil discharged from the discharge hole 14 of the fixed scroll 1 flow in the flow direction because the discharge cover 24 opens on the side opposite to the communication passage 16.17. and collides with the inner wall of the closed container 10. The lubricating oil separated during this collision falls along the inner wall of the closed container 10. Further, the refrigerant gas also changes direction from the collided portion toward the communicating paths 16 and 17.

Therefore, the separation of the refrigerant gas and oil becomes more complete, and more lubricating oil flows down to the part opposite to the communication passage 16.17, and the flow of lubricant oil to the communication passage 16.17 also decreases. It becomes less.

As described above, according to the present invention, by mounting the discharge cover 24, which opens on the side opposite to the communication passage 18.17, above the discharge hole 14 of the fixed scroll 1, the communication passage 16.
The flow of lubricating oil to 17 can be reduced and [,
The amount of oil accumulated in the oil reservoir 23 of the fixed scroll 1 also increases. Therefore, it is possible to prevent a decrease in EER and seizure of sliding parts due to an increase in mechanical loss.

Effects of the Invention As described above, the present invention reduces the flow of lubricating oil into the communication path by installing a discharge cover that opens on the side opposite to the communication path above the discharge hole of the fixed scroll.
It is possible to reduce the amount of oil taken out to the refrigeration system and increase the amount of oil collected in the oil reservoir of the fixed scroll, which has the effect of preventing a decrease in EER and seizure of sliding parts due to increased mechanical loss.

[Brief explanation of the drawing]

Fig. 1 is a vertical cross-sectional view centered on the fixed scroll of a scroll compressor showing an embodiment of the present invention, Fig. 2 is a plan view of the fixed scroll, and Fig. 3 is a longitudinal cross-sectional view of a conventional scroll compressor. 4 is a cross-sectional view showing the meshing state of the scrolls, FIG. 6 is a vertical cross-sectional view centered on a conventional fixed scroll, and FIG. 6 is a plan view of the fixed scroll. DESCRIPTION OF SYMBOLS 1...Fixed scroll, 9...Block, 10...Airtight container, 14...Discharge hole, 16...Discharge chamber, 16 .17...
Communication path, 18... Motor room, 24...
discharge cover. Name of agent: Patent attorney Toshio Nakao and 1 other person! −
Enshi Scroll * I G 14-Note 7 Dai (t
f-side ■-ri Figure 2! /') Summary 3 Figure 4 Figure 5 Figure 1 IG Figure

Claims (1)

[Claims] The inside of the airtight container is divided by a block into the discharge chamber, which is the upper part of the fixed scroll, and the motor chamber, which is the space around the electric motor, and both chambers are communicated with each other by a communication passage provided on the outer periphery of the block and the fixed scroll. The scroll compressor has a discharge cover that opens on the side opposite to the communication path above the discharge hole of the fixed scroll.