JPS61157782A - Scroll compressor - Google Patents

Abstract

PURPOSE:To achieve stable lubrication by making a through-hole for leading the lubricant from an oil chamber formed in the rear of an end plate into a compression chamber through the outercircumferential section of the end plate of a movable scroll member. CONSTITUTION:An oil sump 34 for storing the lubricant pumped through rotation of a crank shaft 6 is formed on the backface of an end plate 12 of movable scroll member 7 for scroll compressor contained in an enclosed container 1. While a through-hole 29 for leading the lubricant from the oil chamber 34 into the compression chamber is made through outercircumferential section of the movable scroll member. The opening at the compression chamber side of the through-hole 29 is opened continually through the flange section of fixed scroll member and since the diameter of said through-hole can be set properly, the lubricant necessary for formation of an oil seal film in the compression chamber can be fed properly.

Description

[Detailed description of the invention] [Technical field of invention] The present invention relates to improvements in scroll compressors.

[Technical background of the invention and its problems]

Generally, a scroll pressure $I machine has a fixed scroll and an orbiting scroll installed in a closed container, and a compression chamber is formed between the two scrolls, and gas is compressed in the compression chamber by orbiting the orbiting scroll. It is something.

Then, both the scrolls are in a non-contact state, and the number -
clearance is maintained. Therefore, this clearance portion is sealed with oil.

By the way, the gas suction method involves sucking inhaled gas directly from the evaporator into the compression chamber and sealing it! Method of discharging inside (
There are two types: the high-pressure type in the case) and the low-pressure type in the case, which takes gas into the space inside the sealed container and then sucks the gas from the space inside the sealed container into the compression chamber.

However, the system in which suction gas is directly sucked from the evaporator during compression runs the risk of sucking liquid refrigerant directly into compression, and is less reliable in this respect. Roughly.

Since the oil returned from the refrigeration cycle is sucked in, the disadvantage is that a large amount of oil is discharged.

On the other hand, in the system in which the gas once taken into the airtight container 2 is suctioned until it is compressed, the amount of oil contained in the suction gas decreases, and the sealing performance for the compression is deteriorated, resulting in a decrease in performance.

[Purpose of the invention]

The present invention was made in view of the above circumstances, and its purpose is to improve the instability factors affected by oil as described above, to ensure stable performance at all times, and to improve reliability. Our objective is to provide a scroll compressor.

[Summary of the invention]

In order to achieve the above object, the present invention forms oil supply through holes in the end plate of the orbiting scroll corresponding to the locations where the scroll compression shaft is not formed, and supplies lubricating oil from the back side of the end plate to the scroll side through the through holes. This is a scroll compressor designed to supply

[Embodiments of the invention]

An embodiment of the present invention will be described below based on nine pages.

Reference numeral 1 in FIG. 1 is a closed container in an in-case low-pressure type scroll compressor, and an electric i-section (not shown) is provided inside the container on the lower side.

A scroll compressor section 3 is installed on the upper side via a fixing frame 2. The scroll compressor section 3 consists of a fixed scroll 5 fixedly attached to the fixing frame 2 with a tightening screw 4, and an orbiting scroll 7 rotationally driven by a drive shaft 6 of the electric motor section. The fixed scroll 5 is provided with a scroll to 8 that opens toward the orbiting scroll 7 side. Furthermore, that scroll sky 8 bottom i! The portion 9 is provided with a spiral fixed wrap 11.

The orbiting scroll 7 has a movable wrap 13 in a spiral shape that meshes with the fixed wrap 11 on an end plate 12 connected to the drive shaft 6 of the electric MS. Roughly.

The end plate 12 of the orbiting scroll 7 is rotatably supported by a thrust bearing ring 14. Further, the end plate 12 of the orbiting scroll 7 makes an eccentric rotation movement with respect to the drive shaft 6 as described later, but at this time, it is connected to the fixing frame 2 through the Oldham ring 15 so as not to rotate. ing. That is, two sets of keys 16 are provided on the upper and lower surfaces of the Oldham ring 15, and the keys (not shown) on the upper surface are placed on the back surface of the mirror plate 12 along its radial direction as shown in FIGS. 2 and 3. The keys 16 on the lower surface are fitted into the key grooves 18 formed in the fixing frame 2, respectively, into the keys y417, which are long and formed at an angular interval of 18 degrees, to form a rotation prevention mechanism for the orbiting scroll 7. be.

Roughly speaking, a suction port 19 is provided on the peripheral wall of the scroll cavity 8 to take in compressed gas from inside the closed container 1. A suction tail pipe 2o is connected to this suction port 19, and the tail pipe 19 protrudes into the closed container 1, rises upward, and opens at a relatively high position. In other words,! 5. The position of the suction port 19, which takes in the compressed gas from inside the closed container 1, is substantially raised. Therefore, liquid refrigerant is not sucked in during sleeping start-up or liquid return operation, and liquid compression is not caused. Therefore, galling and seizing on the drive shaft 6 does not occur.

Note that a suction pipe 21 connected to an evaporator (not shown) is opened in the wall of the closed container 1.

Furthermore, a discharge port 22 for discharging the gas compressed by each wrap 11.13 is provided in the wall portion of the fixed scroll 5 corresponding to the center of the scroll M8. This discharge port 22
The discharge opening side is covered by a cover 23 and communicates with a chamber 24 formed inside the cover 23. Further, a discharge pipe 25 is connected to this chamber 24. This discharge pipe 25 is led out of the closed container 1 and connected to a condenser (not shown).

The end plate 12 on the orbiting scroll side is the drive shaft 6 of the electric motor section.
is connected to the top of the That is, a balance weight 26 is attached to the upper end of the drive shaft 6, and a crank pin 27 that projects eccentrically from the rotation center of the drive shaft 6 is provided at the upper end of the balance weight 26. This crank bin 27 is connected to the end plate 1 of the orbiting scroll 7.
It is fitted into a hole 28 formed on the back surface of the holder 2 and connected so as to be rotatable once. Thus, when the drive shaft 6 is rotated, the orbiting scroll 7 rotates eccentrically.

On the other hand, as shown in FIGS. 2 and 3, the mirror plate 12 has a through hole 29 located within the keyway 17 thereof. In addition, at a certain rotational position, the through hole 29 is provided in a position that faces the scroll shaft 8 and can correspond to a location where the compressed shaft is not formed between the two wraps 11 and 13. And when the orbiting scroll 7 rotates.

The through hole 29 is opened and closed by the key 16 of the Oldham ring 15 or by the end surface 5A of the fixed scroll 5. In other words, the second through hole 29 faces the scroll cavity 8,
Moreover, it is provided at a location selectively located at a location where the compression that should be formed between the two wraps 11 and 13 does not occur. Therefore, the through hole 29 is not always open during the orbiting of the orbiting scroll 7, but is appropriately closed.

On the other hand, the drive shaft 6 has an oil raising hole 3 as shown in FIG.
1 is formed. The upper end of this oil raising hole 31 opens at the side wall and upper end surface of the crank bin 27, respectively. First, there is communication between the crank bin 27 and the hole 28, and oil is supplied thereto.

That is, the oil lifting hole 31 sucks up the oil accumulated at the bottom of the closed container 1 through the centrifugal pump mechanism formed at the bottom of the drive shaft 6 according to the rotation of the drive shaft 6.

The crank bottle 27 and the hole 28 are communicated with each other to supply oil.

Further, an oil hole 33 is bored in the m wall of the boss 32 forming the hole 28, as shown in FIG. The oil supplied between the crank bottle 27 and the hole 28 is communicated through the oil hole 33 to a back chamber 34 on the back side of the orbiting scroll 7, thereby supplying oil. In other words, these oil passages communicate with the through hole 29 and the through hole 2
9 constitutes a lubricating oil supply system that guides and supplies lubricating oil from the back side of the end plate 12 to the scroll to the 8 side.

Note that a groove 35 is formed in the upper end surface portion of the thrust receiving ring 14 that comes into sliding contact with the OM plate 12. .

Furthermore, a communication hole (not shown) is formed in the fixing frame 2 to communicate the back chamber 34 with the inside of the closed container 1.

Next, the operation of the above embodiment will be explained.

It rotates eccentrically while being prevented from rolling. Due to this orbiting movement, the compressed material that is solidified with the movable wrap 13 of the orbiting scroll 7 advances toward the central portion and its volume decreases. and,
Along with this operation, the gas taken into the closed container 1 is sucked in from the suction port 19, sequentially compressed by the above compression process, discharged from the discharge port 22 into the chamber 24, and roughly condensed through the discharge pipe 25. Send it to the machine.

On the other hand, along with the orbiting movement of the orbiting scroll 7, that is, according to the rotation of the drive shaft 6, the oil accumulated at the bottom of the closed container 1 is sucked up through the centrifugal pump mechanism formed at the bottom of the drive shaft 6. Raising hole 31. crank pin 27
and hole 28, oil hole 33. The end plate 1 of the orbiting scroll 7 is passed through the back chamber 34 and through the through hole 29 of the end plate 12 of the orbiting scroll 7.
Lubricating oil is guided and supplied from the back side of 2 to the empty scroll 8 side. And when the orbiting scroll 7 rotates.

The through hole 29 is opened and closed by the key 16 of the Oldham ring 15 or by the end surface 5A of the fixed scroll 5. In other words, the first through hole 29 faces the scroll chamber 8,
Moreover, it is provided at a location selectively located at a location where no compressed air is to be formed between the two wraps 11 and 13. For this reason.

Since the through hole 29 is not always opened during the orbiting of the orbiting scroll 7 and is appropriately closed, there is no possibility of oversupply of oil. In other words, the amount of oil supplied is appropriately adjusted by the opening and closing operations described above.

Further, during the above operation, gas is guided from inside the closed container 1 to the yellowing 34 through a communication hole (not shown) provided in the fixing frame 2, and is sucked into the scroll compressor through the through hole 28.

Since the gas to be compressed is taken into the scroll to 8 through the through hole 29 in this way, the suction port 19 on the fixed scroll side can be made smaller.

Note that the through hole 28 of the orbiting scroll 7 is provided at a special position that is opened and closed by the key 16 of the Oldham ring 15 or by the end surface 5A of the fixed scroll 5 when the orbiting scroll 7 rotates. It may be provided at a position that is not closed by the end surface 5A. In other words, the first through hole 29 may be provided at a location that faces the scroll M8 and is always located at a location where the compression that should be formed between the two wraps 11 and 13 does not occur. Also.

The size and number of the through holes 19 are not particularly limited, and the through holes 19 may be used as reference holes for machining the orbiting scroll 7. Further, a through hole dedicated to the processing reference hole may be provided separately.

〔Effect of the invention〕

As explained above, in the present invention, a through hole is provided in the end plate of an orbiting scroll, and in order to take lubricating oil into the scroll cavity from this through hole, the size of the through hole is limited.

It is easy to adjust the number etc. appropriately. and.

Scroll compression! The minimum amount of lubricant required for forming a seal can be sucked in. In other words, it is possible to stabilize the amount of discharged oil and stabilize the performance.

[Brief explanation of drawings]

The drawings show one embodiment of the present invention, in which Fig. 1 is a side sectional view of the main parts of a scroll compressor, Fig. 2 is a bottom view of the orbiting scroll, and Fig. 3 is a line A-A in Fig. 2. FIG. 4 is an enlarged cross-sectional view of the connecting portion between the drive shaft and the orbiting scroll. DESCRIPTION OF SYMBOLS 1... Airtight container, 2... Fixed frame, 3-scroll compressor, 5... Fixed frame, 6... Drive shaft. 7... Orbital scroll, 8... Scroll to, 11
...Fixed wrap, 12...End plate, 13...Movable wrap, 15...Oldham ring, 17.18...Keyway, 19...Suction port, 29...Through hole, 31・
...Oil lifting hole, 33...Oil hole, 34...Backcross. Applicant's agent Patent attorney Takehiko Suzue Figure 1

Claims (2)

[Claims] (1) A fixed scroll provided with a spiral fixed wrap, and an orbiting scroll provided with a spiral movable wrap that meshes with the fixed wrap on an end plate eccentrically connected to a drive shaft, In a scroll compressor in which a compression chamber formed between a movable wrap moves toward the center by eccentric rotation of the orbiting scroll with respect to a fixed scroll and compresses fluid, the compression chamber is formed on the periphery of an end plate where the compression chamber is not formed. What is claimed is: 1. A scroll compressor comprising: a through-hole; and a lubricating oil supply path that communicates with the through-hole and guides and supplies lubricating oil from the back side of the end plate to the scroll chamber side through the through-hole. (2) The through hole is formed in a key groove for an Oldham ring formed in the end plate at a position to be opened and closed by a key of the Oldham ring. scroll compressor.