JP2000170674A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a backward current of lubricating oil separated from compression gas in a discharge chamber through an oil returning throttle passage, and to prevent collecting in volume of the lubricating into the discharging chamber. SOLUTION: Compression gas compressed by a scroll type compressing system C is discharged into a discharging chamber 46 through a discharging port 13 provided on an end plate 11 of a fixed scroll 1, collides with a discharging valve 17 and a baffle plate 63, and changes a direction in the discharging chamber 46, so that mist of the lubricating oil included in the compression gas is separated. The separated lubricating oil drops to be temporarily collected in the discharging chamber 46. When a tip surface of a spiral lap 22 opens a low pressure side exit of a throttle passage 60 in a process of revolution movement of a revolving scroll 2, the collected lubricating oil 65 is returned to a low pressure side (an intake port 47) through a strainer 61 and the throttle passage 60 by differential pressure between discharging pressure in the discharging chamber 46 and intake pressure on the low pressure side.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art One example of a conventional scroll compressor is shown in FIG.
Is shown in In FIG. 2, reference numeral 4 denotes a housing, which comprises a cup-shaped right housing 49, a frame 5, and a cup-shaped left housing 43, which are fastened to each other by bolts 56. An electric motor M is provided inside the right housing 49, and a scroll-type compression mechanism C is provided inside the left housing 43.

[0003] The electric motor M and the scroll-type compression mechanism C are linked to each other via a rotary shaft 3. The right end of the rotary shaft 3 is supported by a right housing 49 via a sub bearing 51, and the left end is a main bearing 52.
Is mounted on the frame 5 through the shaft.

The electric motor M includes a rotor Ma and a stator Mb.
, And the rotor Ma is fixed to the rotary shaft 3,
The stator Mb is fixed by being pressed into the right housing 49.

The scroll-type compression mechanism C includes a fixed scroll 1, an orbiting scroll 2, an Oldham link 6 for preventing the orbiting scroll 2 from rotating, and the like.

The fixed scroll 1 has an end plate 11 and a spiral wrap 12 erected on its inner surface.
The housing 4 is partitioned into a low-pressure side and a high-pressure side by closely contacting the outer peripheral surface of the housing 4 with the inner peripheral surface of the left housing 43. A discharge chamber 46 is formed on the left side of the end plate 11, and a suction chamber 47 is formed on the right side. Is limited.

A discharge port 13 is provided at the center of the end plate 11.
The discharge port 13 is opened and closed by a discharge valve 17. The fixed scroll 1 is fastened to the left housing 43 by screwing a bolt 57 into a projection 15 projecting leftward from the outer surface of the end plate 11.

The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21.
The drive bush 3 is provided in the boss 23 erected on the outer surface of the vehicle.
2 is rotatably fitted via a swivel bearing 34.
A slide groove 33 formed in the drive bush 32
An eccentric drive pin 31 eccentrically projecting from the left end of the rotary shaft 3 is slidably fitted therein.

The Oldham link 6 is interposed between the end plate 21 and the frame 5, and the outer surface of the end plate 21 is in sliding contact with the left end surface of the frame 5 via a thrust bearing 53.

The fixed scroll 1 and the orbiting scroll 2 are eccentric by a predetermined distance from each other, and are engaged with each other at an angle of 180 degrees to form a plurality of closed spaces 24.
Are formed.

When the electric motor M is driven, the orbiting scroll 2 is driven via an orbiting drive mechanism including a rotary shaft 3, an eccentric drive pin 31, a drive bush 32, an orbiting bearing 34, a boss 23 and the like. While revolving around the link 6, it revolves around a circular orbit having a revolving radius.

Then, refrigerant gas containing mist-like lubricating oil enters the low-pressure chamber 48 via the suction port 44, and this gas flows through the passage 58 provided on the outer periphery of the stator Mb and the stator Mb.
After cooling the electric motor M in the process of passing through the gap 59 between the motor 5 and the rotor Ma, the electric motor M is sucked into the closed space 24 through the passage 54 and the suction chamber 47 provided in the frame 5.

As the volume of the closed space 24 decreases due to the revolving orbiting motion of the orbiting scroll 2, the compressed space reaches the central portion while being compressed, passes through the discharge port 13 from the central portion, pushes the discharge valve 17 open and discharges. Discharged into the chamber 46,
From there, it flows out through the discharge port 45 to the outside.

[0014]

In the conventional scroll type compressor, the gas compressed by the scroll type compression mechanism C mist of the lubricating oil contained in the gas when it collides with the discharge valve 17 from the discharge port 13. Are separated and the discharge chamber 4
Since the mist of the lubricating oil is further separated by reversing the direction in the direction 6, there is a problem that a large amount of lubricating oil accumulates in the discharge chamber 46 when the operation period of the scroll compressor is prolonged.

When a large amount of lubricating oil accumulates in the discharge chamber 46, the mist of the lubricating oil contained in the gas sucked into the housing 4 decreases, and the sliding portion lubricated by the mist That is, bearings 51 and 52, slewing bearing 34, thrust bearing 53, eccentric drive pin 3
1, causing poor lubrication of the meshing surface of the Oldham link 6, the fixed scroll 1 and the orbiting scroll 2, etc., a reduction in the oil seal function, and the like.

[0016]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is characterized by an oil for communicating a discharge chamber and a low pressure side to an end plate of a fixed scroll. That is, a return throttle passage is provided.

Thus, the compressed gas compressed by the scroll type compression mechanism is discharged from the discharge port provided in the end plate of the fixed scroll to the discharge chamber, where the mist of the lubricating oil contained in the compressed gas is separated. . The separated lubricating oil accumulates in the discharge chamber and returns to the low pressure side through the oil return throttle passage.

If the low-pressure outlet of the throttle passage is opened at a position where it can be opened and closed by the orbiting scroll, the amount of lubricating oil that returns to the low-pressure side through the throttle passage is adjusted and the fixed scroll and the orbiting scroll are separated. Lubricating oil is supplied to the meshing surface.

If a strainer is provided at the outlet of the throttle passage on the discharge chamber side, the foreign matter in the lubricating oil is trapped by the strainer and does not flow into the low pressure side through the throttle passage.

If a baffle plate is installed in the discharge chamber so as to face the discharge port, the compressed gas discharged from the discharge port collides with the baffle plate, and the mist of the lubricating oil is separated from the compressed gas.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS One embodiment of the present invention is shown in FIG. In the lower part of the end plate 11 of the fixed scroll 1, there is formed a throttle passage 60 penetrating therethrough to communicate the discharge chamber 46 and the low-pressure side 47, and the low-pressure side outlet thereof is formed by the spiral wrap 22 of the orbiting scroll 2. It is open at the position where it can be opened and closed on the tip surface. A strainer 61 is provided at the discharge chamber side entrance of the throttle passage 60.

A baffle plate 63 made of a punched metal or the like is installed in the discharge chamber 46 so as to face the discharge port 13.
Thus, the fixed scroll 1 is fastened to the outer surface of the end plate 11. The other configuration is the same as that of the conventional one shown in FIG. 2, and the corresponding members are denoted by the same reference numerals and description thereof will be omitted.

Thus, the compressed gas compressed by the scroll type compression mechanism C is discharged from the discharge port 13 provided in the end plate 11 of the fixed scroll 1 into the discharge chamber 46 and the discharge valve 17 is discharged.
The mist of the lubricating oil contained in the compressed gas is separated by colliding with the baffle plate 63 and changing the direction in the discharge chamber 46.

The separated lubricating oil is dropped and temporarily stored in the lower part of the discharge chamber 46. When the leading end surface of the spiral wrap 22 opens the low pressure side outlet of the throttle passage 60 in the course of the orbital movement of the orbiting scroll 2, the lubricating oil 65 stored in the lower part of the discharge chamber 46 is discharged. Due to the pressure difference between the internal discharge pressure and the suction chamber 47, that is, the suction pressure on the low pressure side, the pressure returns to the low pressure side (suction chamber 47) through the strainer 61 and the throttle passage 60.

When flowing through the strainer 61, the lubricating oil 65
The foreign matter inside is captured by the strainer 61. The lubricating oil flowing into the low-pressure side 47 is immediately scraped off by the tip end surface of the spiral wrap 22 of the orbiting scroll 2, and is supplied to the sliding surface between the tip end surface and the inner surface of the end plate 11 of the fixed scroll 1. The sliding surface between the side surface of the spiral wrap 22 and the side surface of the spiral wrap 12 further includes the spiral wrap 1
2 is supplied to the sliding surface between the front end surface and the inner surface of the end plate 21 to lubricate and simultaneously seal these sliding surfaces.

By appropriately selecting the position of the outlet on the low pressure side of the throttle passage 60, the ratio of the opening time and the closing time of the throttle passage 60 can be changed, and the diameter of the throttle passage 60 is appropriately selected. By doing so, the amount of lubricating oil passing through the throttle passage 60 can be adjusted.

[0027]

According to the present invention, since the oil return throttle passage for communicating the discharge chamber with the low pressure side is formed in the end plate of the fixed scroll, the lubricating oil separated from the compressed gas in the discharge chamber is used for oil return. Since it returns to the low pressure side through the throttle passage, a large amount of lubricating oil can be prevented from accumulating in the discharge chamber. Therefore, it is possible to prevent the mist of the lubricating oil in the refrigerant gas returning into the housing from being reduced, so that the device in the housing can be sufficiently lubricated with the mist-like lubricating oil.

If the low-pressure outlet of the throttle passage is opened at a position that can be opened and closed by the orbiting scroll, the amount of lubricating oil passing through the throttle passage can be adjusted, and the lubricating oil that has passed through the throttle passage rotates with the fixed scroll. The surface meshed with the scroll can be lubricated and sealed.

If a strainer is provided at the inlet of the throttle passage on the discharge chamber side, foreign matter in the lubricating oil is captured by the strainer, so that the foreign matter does not flow into the low-pressure side through the throttle passage.

If the baffle plate is installed in the discharge chamber so as to face the discharge port, the compressed gas discharged from the discharge port collides with the baffle plate, so that the mist of the lubricating oil can be reliably separated from the compressed gas.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view of a scroll compressor showing an embodiment of the present invention.

FIG. 2 is a longitudinal sectional view of a conventional scroll compressor.

[Description of Signs] 4 Housing C Scroll type compression mechanism 1 Fixed scroll 11 End plate 12 Spiral wrap 13 Discharge port 2 Orbiting scroll 21 End plate 22 Spiral wrap 46 Discharge chamber (high pressure side) 47 Suction chamber (low pressure side) ) 60 throttle passage 61 strainer 63 baffle plate 65 lubricating oil

Claims (4)

[Claims] A scroll type compression mechanism in which a fixed scroll and an orbiting scroll mesh with each other is housed and installed in a housing, and the inside of the housing is partitioned into a low-pressure side and a high-pressure side by an end plate of the fixed scroll. A scroll-type compressor having a side serving as a discharge chamber for compressed gas discharged from a discharge port provided on an end plate of the fixed scroll, for returning oil to communicate the discharge chamber with the low-pressure side to the end plate of the fixed scroll. A scroll compressor having a throttle passage. 2. The scroll compressor according to claim 1, wherein a low-pressure outlet of the throttle passage is opened at a position opened and closed by the orbiting scroll. 3. The scroll compressor according to claim 1, wherein a strainer is provided at an inlet of the throttle passage on the discharge chamber side. 4. The scroll compressor according to claim 1, wherein a baffle plate is provided in said discharge chamber so as to face said discharge port.