JP2006017130A - Scroll type compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve oil separation effect, effectively utilize a space in a delivery chamber, and expand an oil reservoir chamber. <P>SOLUTION: A bulkhead 36 partitioning the oil reservoir chamber 37 and a delivery chamber 38 is provided with being bent up and down in corresponding to a shape of a structure body around the discharge opening and an upper expansion zone 37a, 37b expanding the oil reservoir chamber 37 upward is formed. Consequently, an oil separator 50 is arranged in the delivery chamber 38, a gas discharging opening 52b opening outward of the housing is provided at upper part of the same, and an oil drain hole 55 communicating to the upper expansion zone 37a is provided at a lower part of the oil separator 50. The upper expansion zone can be plural, the upper expansion zone 37a having the oil drain hole 55 opened thereon and other upper expansion zone 37b is , in embodiment, is connected by a gas release passage 45 provided on end surface joining part of the bulkhead. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a scroll compressor, and more particularly to a lubricating oil storage structure for a compressor.

  In general, in compressors, oil droplets of lubricating oil are suspended in the refrigerant gas and lubrication is performed for sliding parts such as shaft seals, compression mechanisms, and bearings. This lubricating oil is suspended in the refrigerant gas. If the compressor is circulated from the compressor into the refrigerant circuit, the lubricant will adhere to the heat exchange surface inside the heat exchanger such as an evaporator or condenser, and the heat exchange capacity of the heat exchanger will be reduced. is there. For this reason, an oil separation mechanism is provided in the compressor to separate the lubricating oil so that the lubricating oil does not flow out together with the refrigerant gas from the compressor to the refrigerant circuit, and the separated lubricating oil is stored. In the compressor, a mechanism is adopted in which each sliding part is supplied directly or indirectly in a refrigerant gas.

By the way, in the case of the conventional compressor, for example, in the case of the scroll compressor described in Patent Document 1, the discharge gas from the compression chamber formed by the pair of scrolls is compressed using the fixed side plate of the fixed scroll as a boundary wall. A discharge chamber provided adjacent to the chamber is sent through a discharge port and a discharge valve provided in the fixed side plate, and oil is separated in the discharge chamber, and the separated lubricating oil is disposed in a lower portion of the discharge chamber. It is stored in. Further, in the case of this lubricating oil storage structure, a rib is extended from the fixed side plate and the rear housing to form a collision surface, and the discharge gas discharged from the discharge port is made to collide with the collision surface. And the lubricating oil was stored in the storage space below the ribs.
However, since the space between the storage space below the rib and the discharge chamber above the rib is open so that the lubricating oil can be passed on the side of the rib, the lubricating oil once separated is discharged gas. There is a problem that the oil separation effect is lowered.

JP-A-4-279786

  The present invention has been made paying attention to such problems existing in the prior art, and the problem is to improve the oil separation effect.

  In order to achieve the above object, the invention according to the present application includes a housing, a fixed scroll, and a movable scroll. A compression chamber is formed by the fixed scroll and the movable scroll, and the discharge chamber is adjacent to the compression chamber. In a scroll type compressor in which the compression chamber and the discharge chamber communicate with each other via a discharge port provided on the boundary wall between the two chambers, the lower portion of the discharge chamber serves as an oil storage chamber, and the upper portion serves as a discharge chamber. A partition wall that hermetically partitions the chamber and the discharge chamber is formed, a centrifugal oil separator is disposed in the housing, and the discharge chamber is connected to the oil separator through the discharge gas introduction hole. An oil drain hole communicating with the oil storage chamber is provided in a lower portion of the oil tank.

  By forming in this way, the discharge gas discharged from the compression chamber through the discharge port is introduced into the oil separator for oil separation, and the separated lubricating oil passes through the oil drain hole to the oil separator. The discharged gas from which the mist-like lubricating oil has been introduced is sent to the refrigerant circuit through the gas discharge port of the oil separator. Further, since the oil storage chamber and the discharge chamber are partitioned by the partition wall, the lubricating oil once separated and introduced into the oil storage chamber does not come and go to the discharge chamber, and is therefore stored in the oil storage chamber. Lubricating oil is not wound on the discharge gas.

The oil separator may be formed of an outer cylinder and an inner cylinder, and a lower end of the inner cylinder may be located in an upper portion near the oil drain hole.
The inner cylinder may have a length that is more than half of the outer cylinder.
A discharge gas introduction hole may be opened in the upper side wall of the outer cylinder facing the discharge chamber.
The diameter of the discharge gas introduction hole and the diameter of the oil discharge hole may be smaller than the inner diameter of the outer cylinder of the oil separator.
The oil drain hole may be characterized by opening in the upper part of the oil storage chamber.

  In the scroll compressor according to the present invention, the discharge chamber is airtightly divided vertically into the discharge chamber and the oil storage chamber by the partition wall, so that the separated and stored lubricating oil is not wound up by the discharge gas, and the oil separation Good effect.

Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. 1 to 5. In this compressor, the fixed scroll 1 is formed by a fixed side plate 1a, a shell 1b that is formed integrally with the fixed side plate 1a and that forms the outline of the fixed scroll 1, and an involute curve or the like inside the fixed side plate 1a. And the fixed spiral body 1c. The movable scroll 2 is formed of a movable side plate 2a and a movable spiral body 2c formed by an involute curve or the like inside the movable side plate 2a. A compression chamber 3 is formed by engaging the movable scroll 2 and the fixed scroll 1 so as to face each other.
1, a front housing 4 is coupled to the left side of the fixed scroll 1, that is, the shell 1b, and a drive shaft 7 is rotatably supported in the front housing 4 via a shaft seal device 5 and a main bearing 6. Yes. An eccentric pin 8 is formed eccentrically at the inner end of the large-diameter portion of the drive shaft 7. A drive bush 9 is fitted to the eccentric pin 8, and a balance weight 10 that absorbs dynamic imbalance is provided. It is attached. The movable scroll 2 is rotatably supported by the drive bush 9 via the radial bearing 11.

A pair of revolution position restricting holes 21 are provided in the pressure receiving wall 4a of the front housing 4 with respect to the movable scroll 2, and a pair of columnar steel rotation prevention elements 22 supporting holes 23 are provided on the movable side plate 2a side. It has been.
The revolution position restricting hole 21 is disposed at a rotationally symmetric position of 180 ° with respect to the rotational axis L ₁ of the drive shaft 7, and the support hole 23 of the rotation preventing element 22 is 180 ° with respect to the central axis L ₂ of the drive bush 9. It is arranged at a rotationally symmetric position. One end of the rotation preventing element 22 is supported by the support hole 23, and the other end is inserted so that the outer peripheral surface is in contact with the inner peripheral surface of the revolution position restricting hole 21.

A bowl-shaped rear housing 30 is coupled to the rear surface side of the fixed scroll 1 by a fixing bolt 25. As a result of this connection, the outer peripheral wall 1d of the shell 1b and the outer peripheral wall 30a of the rear housing 30 that form the outer shell of the fixed scroll protruding rearward from the fixed side plate 1a are also suspended from the fixed side plate 1a described later. The partition wall 36a and the partition wall 36b suspended from the rear wall 30b of the rear housing 30 are airtightly joined to each other via a single gasket 40, and a discharge chamber 31 is formed by the fixed side plate 1a and the rear housing 30.
In addition, a discharge port 32 that connects the discharge chamber 31 and the center portion of the compression chamber 3 is opened at the center of the fixed side plate 1a. A discharge valve 33 is a retainer 34 on the discharge chamber 31 side of the discharge port 32. At the same time, it is fixed to the fixed side plate 1 a by a bolt 35.
Although not shown, the suction port from the refrigerant circuit is formed in the front housing 4 or the shell 1b and communicates with the compression chamber 3.

1 and 2, reference numeral 36 denotes the above-described partition wall, which includes the partition wall 36a suspended from the fixed side plate 1a and the partition wall 36b suspended from the rear wall 30b of the rear housing 30, and joined to the outer peripheral wall 30a. It is joined at a joint surface substantially the same as the surface. Then, the discharge chamber 31 is vertically and hermetically partitioned by the partition wall 36, and the lower portion is formed as the oil storage chamber 37 and the upper portion is formed as the discharge chamber 38.
In FIG. 2, a center imaginary line (two-dot chain line) circle 32A indicates a corresponding position of the discharge port 32, but the partition wall 36 has a structure around the discharge port 32 in order to connect the discharge port 32 to the discharge chamber 38. That is, it is shaped to be lowered while avoiding the discharge valve 33 and the retainer 34, and is bent upward from the lower ends of the discharge valve 33 and the retainer 34 at both sides centering on the discharge port 32, and upward by this bending A portion of the expanded oil storage chamber 37 is formed, which is referred to as upper expansion regions 37a and 37b.

1 to 3, reference numeral 50 denotes an oil separator housed in a discharge chamber, which includes a bottomed outer cylinder 51 and an inner cylinder 52 disposed concentrically with the outer cylinder 51. A centrifugal separation type oil separator in which a hollow portion 53 is formed between 51 and the inner cylinder 52 is configured.
As can be seen from FIGS. 2 to 4, the outer cylinder 51 is formed integrally with the rear housing 30. In other words, the upper end portion of the outer cylinder 51 is connected to the outer peripheral wall 30a of the rear housing 30 to form an opening portion 51a that opens to the outside of the discharge chamber, the side portion is connected to the rear wall 30b of the rear housing 30, and the lower end portion is The shape penetrates the partition wall 36b and faces the upper expansion region 37a on the right side of the oil storage chamber 37 in FIG.
Further, in the upper side wall of the outer cylinder 51 facing the discharge chamber 38, a discharge gas introduction hole 54 is opened in a tangential direction with respect to the inner hollow portion 53, and the oil storage chamber 37 at the lower end of the outer cylinder 51 is formed. An oil drain hole 55 for allowing the separated lubricating oil to drip into the oil storage chamber 37 is opened on the side wall facing the upper expansion region 37a.
The inner cylinder 52 includes a pipe connection portion including a thick flange portion 52a and a fitting portion 52b fitted into the opening 51a, and a pipe-shaped portion 52c connected to the pipe connection portion. In the section, a gas outlet 52d is opened in the center.
Further, the pipe-shaped portion 52c of the inner cylinder 52 configured in this way is inserted concentrically with the outer cylinder 51 from the opening 51a of the outer cylinder 51, and the fitting portion 52b is fitted, so that the pipe connection portion Is welded to the outer peripheral wall 30 a of the rear housing 30 to form a hollow portion 53 between the inner wall of the outer cylinder 51 and the outer wall of the inner cylinder 52. The pipe-shaped portion 52 c of the inner cylinder 52 does not have a bottom wall, and the length thereof is such that the tip of the inner cylinder 52 is slightly above the oil drain hole 55.

In FIGS. 1 and 5, reference numeral 45 denotes a gas vent passage, which is composed of a concave groove 44 formed on the end face of the partition wall 36 b and a concave groove 42 formed in the gasket 40 so as to face the concave groove 44. ing. The concave groove 44 is formed in a substantially U-shaped concave groove from the left upper extension region 37b to the right upper extension region 37a in FIG. 2 on the center line of the end face of the partition wall 36b of the rear housing 30. On the other hand, the concave groove 42 is formed so as to face the U-shaped concave groove 44. By forming the gasket 40 as a cross-sectional shape that refracts unevenly as shown in FIG. It is formed as a groove in the mold. Then, both end portions of each of the concave grooves 42 and 44 are opened to the upper portions of the upper expansion regions 37a and 37b of the oil storage chamber 37, respectively.
In addition, since the concave grooves 42 and 44 are formed in the center line part of the partition walls 36a and 36b, respectively, airtightness is maintained in the parts on both sides of the concave grooves 42 and 44.

In the scroll compressor configured as described above, the rotation of the engine (not shown) of the automobile is transmitted to the drive shaft 7 shown in FIG. 1 by the connection of the electromagnetic clutch (not shown), and the eccentric pin 8 is revolved. Then, the movable scroll 2 revolves around the drive shaft 7 while receiving the rotation restricting action of the rotation preventing element 22, and the refrigerant gas sucked from a suction port (not shown) is sucked into the compression chamber 3 and sequentially inside the compression chamber 3. The pressure is increased, and the discharge valve 33 is pushed open from the discharge port 32 to be discharged into the discharge chamber 31.
Then, the refrigerant gas discharged into the discharge chamber 31 is introduced into the oil separator 50 through the discharge gas introduction hole 54. At this time, since the discharge gas introduction hole 54 is opened in the tangential direction with respect to the hollow portion 53, the refrigerant gas introduced into the hollow portion 53 is also as shown by the solid line arrow in FIG. The mist-like lubricating oil having a high specific gravity is urged in the centrifugal direction by the swirling flow of the refrigerant gas, adheres to the wall surface of the hollow portion 53, that is, the inner wall surface of the outer cylinder 51, and is lowered downward by gravity. The oil is dropped and stored in the oil storage chamber 37 through the oil drain hole 55. The lubricating oil stored in the oil storage chamber 37 is supplied to each sliding portion through a lubricating oil supply path (not shown). On the other hand, the discharge gas from which the lubricating oil has been removed passes through the lower end of the inner cylinder 52 of the oil separator 50 and is sent to the refrigerant circuit from the gas discharge port 52d.

The lubricating oil stored in the oil storage chamber 37 as described above does not come and go between the oil storage chamber 37 and the discharge chamber 38 because the oil storage chamber 37 is partitioned by the discharge chamber 38 and the partition wall 36. The once separated lubricating oil is not wound up by the discharge gas. Further, since the oil drain hole 55 is opened at the upper part of the upper extended region 37a, the lubricating oil can be stored up to the level of the oil drain hole 55.
The oil drain hole 55 is opened only in one upper expansion area 37a of the oil storage chamber 37, but the other upper expansion area 37b and the upper expansion area 37a in which the oil drain hole 55 is opened are defined as a partition wall. Communication is made by a gas vent passage 45 formed in the joint portion of 36. When the oil level in the oil storage chamber 37 reaches the lower end of the bent partition walls 36a and 36b, the gas is confined in the upper expansion region 37b on the side where the oil drain hole 55 is not opened, and more It is difficult to raise the oil level. However, in the scroll compressor according to the present embodiment, due to the presence of the gas vent passage 45 described above, the oil is trapped in the upper expansion region 37b as the oil is drawn from the oil drain hole 55 to the upper expansion region 37a. The gas can be moved to the upper expansion zone 37a. Therefore, the oil level in the upper expansion region 37 b can be increased by the amount of the moved gas, and both the upper expansion regions 37 a and 37 b can be used as the oil storage chamber 37.
From the viewpoint of venting the refrigerant gas, even if a hole communicating with the discharge chamber 38 is provided in the partition walls 36a and 36b of the upper expansion region 37b, the discharge gas flows into the oil storage chamber 37 from the hole, and the oil separator 50 Since a gas flow that flows through the refrigerant circuit through the gas is generated, the gas does not function as a gas vent and the lubricating oil is wound up, so that the oil separation function and the lubricating oil storage function are deteriorated.

Further, since the gas vent passage 45 is formed at the joint portion of the partition wall 36, it is only necessary to provide the concave grooves 42 and 44 in the end face of the partition wall 36 or the gasket 40 as in this embodiment. Is easy.
In this embodiment, the concave grooves 42 and 44 are formed on both the end face of the partition wall 36 and the contact face of the gasket 40. However, the concave groove 42 on the gasket 40 side can be omitted. However, according to the present embodiment, the depth of the concave groove 44 provided on the end face of the partition wall 36 can be reduced, and the strength of the partition wall 36 can be prevented from being lowered.

Various methods other than the present embodiment are conceivable for forming the gas vent passage 45 at the junction of the partition wall 36.
(1) In the previous embodiment, the gas vent passage 45 is formed between the end face of the partition wall 36b on the rear housing 30 side and the gasket 40. However, the end face of the partition wall 36a on the fixed scroll 1 side and the gasket 40 In the meantime, the same effect can be obtained even if it is formed as described above.
(2) The shape of the groove 44 provided on the partition wall 36 side is not particularly limited to the U-shape, and may be any groove that can escape the refrigerant gas in the upper expansion region 37b. As shown in FIG. In this case, since there is no surface perpendicular to the end surface like the previous groove 44, it is easy to form the groove 441 integrally when the rear housing 30 or the fixed scroll 1 is molded.
In FIG. 6, the same reference numerals are given to the same portions as those in the above embodiment, and the description thereof is omitted.

(3) Further, when the punched hole 421 formed by the punching die is formed in the gasket 40 as shown in FIG. 7, a concave groove is provided in the end face of any partition wall 36a, 36b of the fixed scroll 1 and the rear housing 30. The gas vent hole 421 itself becomes the gas vent passage 45. Further, in this case, in order to maintain the structure as a single gasket even after the formation of the hole 421 in the gasket 40, both end portions of the hole 421 are formed laterally from the partition wall 36 as shown in FIG. The protruding piece portion 401 is formed so as to protrude, and the protruding piece portion 401 may be connected to the gaskets 40 on both sides of the hole 421.
In FIG. 8, a circle 32 </ b> A of the center virtual line (two-dot chain line) indicates the corresponding position of the discharge port 32. 7 and 8, the same reference numerals are given to the same portions as those in the above embodiment, and the description thereof is omitted.

It is a sectional side view of the whole compressor of an embodiment of the invention. It is the II-II arrow sectional drawing of FIG. FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 2. FIG. 4 is a sectional view taken along arrows IV-IV in FIG. 2. It is sectional drawing of the partition junction part in the compressor of FIG. It is sectional drawing of the partition junction part as other embodiment. It is sectional drawing of the partition junction part as other embodiment different from the thing of FIG. It is a top view of the gasket in embodiment of FIG.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fixed scroll, 2 ... Movable scroll, 3 ... Compression chamber, 30 ... Rear housing, 31 ... Discharge chamber, 32 ... Discharge port, 36 ... Partition, 37 ... Oil storage chamber, 38 ... Discharge chamber, 50 ... Oil separator, 51 ... outer cylinder, 51a ... opening, 52 ... inner cylinder, 54 ... discharge gas introduction hole, 55 ... oil discharge hole.

Claims (6)

A compression chamber is formed by the fixed scroll and the movable scroll, a discharge chamber is provided adjacent to the compression chamber, and both the compression chamber and the discharge chamber are connected to each other. In the scroll type compressor which communicates through the discharge port provided in the boundary wall of the above, and the lower part of the discharge chamber serves as an oil storage chamber and the upper part serves as a discharge chamber.
Forming a partition that hermetically partitions the oil storage chamber and the discharge chamber;
A centrifugal oil separator is disposed in the housing,
The discharge chamber is connected to the oil separator through a discharge gas introduction hole,
A scroll compressor characterized in that an oil drain hole communicating with the oil storage chamber is provided in a lower part of the oil separator.   2. The scroll compressor according to claim 1, wherein the oil separator is formed by an outer cylinder and an inner cylinder, and a lower end of the inner cylinder is located at an upper portion in the vicinity of the oil drain hole.   The scroll compressor according to claim 2, wherein the inner cylinder has a length that is at least half that of the outer cylinder.   The scroll compressor according to any one of claims 1 to 3, wherein the discharge gas introduction hole opens in an upper side wall of the outer cylinder facing the discharge chamber.   The scroll compressor according to any one of claims 2 to 4, wherein a diameter of the discharge gas introduction hole and a diameter of the oil discharge hole are smaller than an inner diameter of the outer cylinder of the oil separator. .   The scroll compressor according to any one of claims 1 to 5, wherein the oil drain hole is opened at an upper portion of the oil storage chamber.

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