JP2000170681A - Compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sufficiently separate lubricant by means of a centrifugal separator and to reduce production costs while preventing discharge pressure from lowering in a compressor with centrifugal oil separator. SOLUTION: A separator pipe 142 is formed by a press machine. This can omit cutting processes, reducing production manhour. In addition, since a separator pipe 142 is made of a pressed thin plate, it is not necessary to take into account minimum wall thickness and draft. Therefore, the separator pipe 142 can be made thin. Accordingly, the pressure loss in the separator pipe 142 can be reduced, and the clearance between the separator pipe 142 and the internal wall face 141a of a separation chamber can be enlarged.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a compressor for lubricating a compression mechanism by sucking a lubricating oil together with a fluid, and is effective when applied to a refrigeration cycle or a heat pump.

[0002]

2. Description of the Related Art Generally, a compressor used in a refrigeration cycle or a heat pump sucks lubricating oil (refrigerating machine oil) together with refrigerant to lubricate a compression mechanism, and discharges the oil by an oil separator provided on a discharge side. Lubricating oil is separated from the refrigerant, and the separated lubricating oil is returned to the suction side. On the other hand, the refrigerant is discharged toward an external pipe connected to the inflow side of the condensation.

[0003]

An oil separator which centrifuges the refrigerant and the lubricating oil by rotating the refrigerant flowing into the separation chamber along the inner wall surface of the separation chamber is generally formed by die casting. The inserted pipe member (joint separator) is inserted and disposed in the separation chamber. For this reason, it is necessary to perform machining such as cutting as a finishing process after the die casting, and thus it is difficult to reduce the number of man-hours for manufacturing the pipe member, which is an obstacle in reducing the manufacturing cost of the compressor. Had become.

[0004] In a cast product such as a die-cast product,
The thickness of the pipe member cannot be reduced due to the necessity of a draft angle in addition to the fact that the thickness of the product cannot be excessively reduced in order to ensure the hot water flow (minimum thickness) of the material. . For this reason, the inner diameter of the pipe member is reduced, the pressure loss when the refrigerant flows through the pipe member is increased, the discharge pressure is reduced, and the gap between the pipe member and the inner wall surface of the separation chamber is reduced. However, the speed of the refrigerant swirling along the inner wall surface is reduced, and a problem occurs that the lubricating oil cannot be sufficiently centrifuged.

SUMMARY OF THE INVENTION In view of the foregoing, it is an object of the present invention to sufficiently centrifuge lubricating oil and reduce the manufacturing cost of a compressor while preventing a decrease in discharge pressure.

[0006]

The present invention uses the following technical means to achieve the above object. Claim 1
According to the third aspect of the invention, the fluid discharged from the compression mechanism (110) flows in and the circumferential inner wall surface (141) is formed.
a) is formed in the separation chamber (141), and the inner wall surface (14).
1a) having an axially extending pipe member (142);
The fluid flowing into the separation chamber (141) is transferred to the pipe member (14).
An oil separator (140) for centrifuging lubricating oil from a fluid by swirling between 2) and the inner wall surface (141a) is provided, and the pipe member (142) performs plastic working on a metal material. It is characterized by being molded by the above.

[0007] Thus, machining such as cutting can be omitted, so that the number of manufacturing steps can be reduced as compared with the case where a pipe member is formed by casting such as die casting. Further, since the pipe member (142) is formed by performing plastic working on the thin material, there is no need to consider the minimum thickness and draft angle.
42) The thickness can be reduced.

Accordingly, the pressure loss in the pipe member (142) can be reduced, and the gap between the pipe member (142) and the inner wall surface (141a) of the separation chamber (141) can be enlarged. As mentioned above,
ADVANTAGE OF THE INVENTION According to the compressor which concerns on this invention, while preventing a fall of discharge pressure, while centrifuging a lubricating oil sufficiently, the manufacturing cost reduction of a compressor can be aimed at.

By the way, in the conventional product in which the pipe member is formed by die-casting, the discharge port is located outside the separation chamber from the outer wall surface of the housing. There was a problem that the degree of freedom was small and mounting of external piping was difficult. Therefore, in the invention according to claim 2, the pipe member (142)
An external pipe is inserted and connected to one end in the axial direction, and a joint portion (1) having an inner diameter larger than that of the other end.
07) is formed, and the joint part (107) is located inside the separation chamber (141) from the outer wall surface of the housing (105).

[0010] Accordingly, the degree of freedom in the arrangement of the external pipe is large, and the mounting property of the external pipe can be improved. Incidentally, the reference numerals in parentheses of the above means are examples showing the correspondence with specific means described in the embodiments described later.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment)
FIG. 1 is a sectional view of a compressor 100 according to the present embodiment, in which a compressor according to the present invention is applied to a vehicle refrigeration cycle. In FIG. 1, reference numeral 101 denotes a front housing, in which a shaft 102 that rotates by obtaining driving force from a vehicle driving engine (not shown) is disposed. Reference numeral 103 denotes a rolling bearing that rotatably supports the shaft 102;
Is a shaft seal such as a lip seal for preventing the refrigerant in the compressor 100 from flowing out.

A compression mechanism 110 sucks and compresses a refrigerant (fluid). The compression mechanism 110 is a fixed scroll (fixed portion) fixed to the front housing 101.
The scroll-type compression mechanism is configured to include a orbiting scroll (movable portion) 112 that is driven by the shaft 111 and the orbiting scroll 111 and is movable with respect to the fixed scroll 111.

A compression mechanism (scroll type compression mechanism)
110 expands and contracts the volume of the working chamber Vc formed by meshing the spiral tooth portions 111a and 112a formed on the scrolls 111 and 112, respectively, thereby sucking and compressing the refrigerant to form the end plate portion 112a. The refrigerant is discharged from the discharge port 112b formed at the bottom.

Reference numeral 106a denotes a reed valve type discharge valve for preventing the refrigerant from flowing backward from the discharge chamber 120 to the working chamber Vc, and reference numeral 106b denotes a valve stop plate (stopper) for regulating the maximum opening of the discharge valve 106. It is. And the discharge valve 106
a and the valve stop plate 106b are fixed to the end plate 112a by a hexagon socket head cap screw 106c. Reference numeral 105 denotes a rear housing fixed to the end plate portion 112a of the fixed scroll (shell) 112.
05 and the fixed scroll 112, the discharge port 1
Discharge chamber 12 for smoothing the pulsation of the refrigerant discharged from 12b
0 and an oil storage chamber 130 in which lubricating oil is stored.

The discharge chamber 120 and the oil storage chamber 130 are
The partition wall projection (partition rib) 112c formed integrally with the end plate 112a and the partition projection (partition rib) 105a formed integrally with the rear housing 105 are separated from each other. The rear housing 105 includes a discharge chamber 120.
A centrifugal oil separator (hereinafter, abbreviated as a separator) 140 is provided for separating lubricating oil from the refrigerant that has been discharged. The separator 140 communicates with the discharge chamber 120 and has a circumferential inner wall surface 141a formed therein. As shown in FIG. 2, the separator 140 is disposed in the separation chamber 141 and has an axis formed on the inner wall surface 141a. And a cylindrical separator pipe (joint separator) 142 extending in the direction.

Therefore, the discharge chamber 120 is separated from the separation chamber 141.
(Including lubricating oil) flows into the separator pipe (pipe member) 142 and the inner wall surface 141 a of the separation chamber 141.
And centrifuged into refrigerant and lubricating oil by the difference in specific gravity. Then, the separated refrigerant is discharged from a lower end side of the separator pipe 142 to a condenser (not shown) from a discharge port (joint portion) 107 on the upper end side, while the lubricating oil is discharged through a communication passage (not shown). 3), is discharged from the separation chamber 141 to the oil storage chamber 130, and then returned to the suction chamber 115 (see FIG. 1) of the compression mechanism 110 via the supply port 113 and the oil supply passage 114 shown in FIG.

The supply port 113 and the oil supply passage 11
4 is formed by forming a deformed hole in a packing (gasket) 108 for sealing a gap between the fixed scroll 111 and the rear housing 105. by the way,
As shown in FIG. 2, the discharge port 107 formed at one end in the axial direction of the separator pipe 142 has an inner diameter at the other end so that an external pipe (not shown) connected to the condenser can be inserted and connected. The discharge port 107 is separated from the outer wall surface of the rear housing 105 by the separation chamber 1.
41 are located inside.

The separator pipe 142 is formed integrally with the discharge port 107 by press working (plastic working) on an iron-based plate material.
The gap between the separator pipe 142 and the rear housing 105 is sealed (sealed) by an O-ring (packing) 143 disposed on the 05 side, and is fixed to the rear housing 105 with bolts.

Next, the features of this embodiment will be described. In the present embodiment, since the separator pipe 142 is formed by press working (plastic working), machining such as cutting can be omitted, and compared with the case where the separator pipe is formed by die casting. The number of manufacturing steps can be reduced.

Further, since the separator pipe 142 is formed by pressing a thin plate material,
There is no need to consider the minimum thickness and draft angle, and the thickness of the separator pipe 142 can be reduced. Therefore, the pressure loss in the separator pipe 142 can be reduced, and the gap between the separator pipe 142 and the inner wall surface 141a of the separation chamber 141 can be increased.

As described above, according to the compressor 100 of the present embodiment, the lubricating oil is sufficiently centrifuged and the manufacturing cost of the compressor is reduced while preventing the discharge pressure from lowering. Can be. By the way, in the conventional product in which the separator pipe is formed by die casting, the discharge port 107 is formed.
Is located outside the separation chamber 141 from the outer wall surface of the rear housing 105, so that there is a problem that the space near the discharge port 107 is small, the degree of freedom of external piping is small, and it is difficult to mount the external piping. Was.

On the other hand, in the present embodiment, the discharge port 107 formed in the separator pipe 142 is located on the inner side of the separation chamber 141 from the outer wall surface of the rear housing 105, so that the degree of freedom of external pipe management is increased. It is large and can improve the mountability of the external piping. By the way, in the above-described embodiment, the compressor adopts the scroll type compression mechanism. However, the present invention is not limited to this, and adopts another compression mechanism such as a swash plate type compression mechanism. Is also good.

The application of the compressor 100 according to the present invention is not limited to a refrigeration cycle for a vehicle, but may be applied to a refrigerator or a stationary refrigeration cycle (such as a home air conditioner) and other compressors. Can also be applied. Further, in the above-described embodiment, the plate material is subjected to the press working, but the separator pipe may be formed by plastic working such as expanding the pipe material.

Further, the O-ring 143 may be omitted, and packing such as rubber material may be joined to the separator pipe 142.

[Brief description of the drawings]

FIG. 1 is a sectional view of a compressor according to an embodiment.

FIG. 2 is a sectional view taken along line BB of FIG.

FIG. 3 is a sectional view taken along line AA of FIG. 1;

[Explanation of symbols]

110: compression mechanism, 120: discharge chamber, 130: oil storage chamber,
140 ... oil separator, 141 ... separation chamber, 142 ...
Separator pipe (pipe member).

Continuing from the front page (72) Inventor Tsutomu Morimoto 1-1-1, Showa-cho, Kariya-shi, Aichi Prefecture Inside Denso Corporation (72) Inventor Tsuyoshi Takemoto 1-1-1, Showa-cho, Kariya City, Aichi Prefecture Inside Denso Corporation (72 ) Inventor Shinichi Watanabe 1-1-1 Showa-cho, Kariya-shi, Aichi F-term in DENSO Corporation (reference) CC45

Claims (3)

[Claims] 1. A compressor for lubricating a compression mechanism (110) for sucking and compressing a fluid by sucking a lubricating oil together with the fluid, wherein a fluid discharged from the compression mechanism (110) flows in and out. A separation chamber (141) having a circumferential inner wall surface (141a) formed therein, and a pipe member (142) extending in the axial direction of the inner wall surface (141a).
By swirling the fluid flowing into 41) between the pipe member (142) and the inner wall surface (141a),
Oil separator (1) for centrifuging lubricating oil from fluid
40), wherein the pipe member (142) is formed by subjecting a metal material to plastic working. 2. An external pipe is inserted and connected to one end of the pipe member (142) in the axial direction, and a joint portion (107) having an inner diameter larger than that of the other end is formed. The compressor according to claim 1, wherein the joint portion (107) is located inside the separation chamber (141) from an outer wall surface of the housing (105). 3. The compressor according to claim 1, wherein the pipe member is made of iron.