JPH04350387A - Rotary compressor - Google Patents

Abstract

PURPOSE:To perform effective oil separation and reduce the oil break of a compressor by returning separated oil rapidly into an oil sump provided at the bottom part of a casing without mixing it again into a discharge fluid. CONSTITUTION:A coil like oil separating body 8 is internally provided in a discharge passage 7 opened into a discharge muffler 52 on the rear head side, and a recessed part 74a is formed at the lower face 31b of a cylinder 31 so as to communicate an oil return hole 74 opened to an oil sump 1a with the discharge passage 7. The end part 81 of the oil separating body 8 is inserted into the oil return hole 74. Gas refrigerant immediately after discharge having the largest mixed quantity of lubricating oil is brought into contact with the oil separating body 8 at the time of passing the discharge passage 7 to separate lubricating oil mixed in the gas refrigerant, and the separated lubricating oil is guided to the oil return hole 74 by the end part 81 so as to be returned into the oil sump 1a. The quantity of the lubricating oil mixed in the gas refrigerant in a primary discharge space 10 is thereby decreased to reduce the outflow of the lubricating oil to the outside of a casing and thereby to enable the holding of lubricating oil in a compressor. The outflow of lubricating oil into a system is also reduced to prevent the lowering of heat exchanger effectiveness.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention provides a method for discharging fluid compressed by the compression element into the inside of the casing through a discharge chamber formed by a discharge muffler. related to rotary compressors.

0002

BACKGROUND OF THE INVENTION A conventional rotary compressor is described in, for example, Japanese Patent Application Laid-open No. 134875/1983, and also shown in FIG.
As shown in the figure, a compression element includes a motor M installed in the upper part of a sealed casing A, a cylinder S located below the motor M, and a front head F and a rear head R arranged above and below the cylinder S. The internal discharge structure of the discharge fluid in this compressor is as follows:
Discharge holes B and C are provided in the front head F and rear head R.
At the same time, mufflers D and E are attached to the upper side of the front head F and the lower side of the rear head R, and the discharge chambers G and H are formed by the mufflers D and E, and the discharge fluid in the upper muffler D is is discharged into the discharge space J between the compression element CP and the motor M, and the compression element CP is discharged into the lower discharge chamber H and the discharge space J.
A discharge passage K is formed to communicate with the lower muffler E, and the discharge fluid in the lower muffler E is discharged into the discharge space J via the discharge passage K. In addition, in Fig. 4, N
is a discharge pipe that opens into the secondary space P.

0003

[Problems to be Solved by the Invention] Incidentally, in the compressor configured as described above, since lubricating oil is supplied to the rotating portion of the compression element CP, the discharge fluid discharged from the compression element CP contains a large amount of lubricating oil. lubricating oil will be mixed in.

[0004] For this reason, in the past, an oil separation plate was provided in the secondary space P;
As described in Japanese Patent No. 88 and as shown in FIG. Since the fluid is separated during the process of being discharged from the secondary space P to the outside via the discharge pipe N, a sufficient separation effect cannot be expected, and the separated oil is not transferred to the casing A.
When the lubricating oil is returned to the oil reservoir located at the bottom of the oil tank, it mixes with the discharge fluid again, resulting in a large amount of lubricating oil flowing out from the compressor into the system.The leaked lubricating oil causes a decrease in efficiency, such as a decrease in the heat exchange rate of the system. In addition, the lubricating oil in the compressor decreases, resulting in oil leakage, which causes seizure inside the compressor.

According to the present invention, the amount of lubricating oil mixed into the discharged fluid is greatest immediately after the discharge. Therefore, by separating the oil near the discharge where the amount of lubricating oil is large, the lubricating oil can pass through the air gap and core cut of the motor. This method focuses on the fact that oil can be separated more effectively than when oil is separated from the discharged fluid that has reached the secondary space. It is an object of the present invention to provide a rotary compressor in which oil can be returned to a reservoir at the bottom of a casing without being mixed in again, and in which oil can be reduced in the compressor.

[0006]

[Means for Solving the Problems] In order to achieve the above object, the present invention has a motor 2 installed in the upper part of the sealed casing 1.
The lower part includes a front head 32, a rear head 33, and a cylinder 31, and at least a compression element 3 having a discharge hole 33b and a discharge muffler 52 is installed in the rear head 33, and an oil reservoir 1a is provided at the bottom of the casing 1. At the same time, through holes 72, 73, 71 are provided in each of the heads 32, 33 and the cylinder 31, and the discharge muffler 52 is provided with through holes 72, 73, 71.
In a rotary compressor having a discharge passage 7 that communicates with the primary discharge space 10 of the casing 1, an oil separator 8 formed by winding a wire into a coil is installed in the discharge passage 7, and The oil reservoir 1 is located at the bottom of the discharge passage 7.
The end portion 81 of the oil separator 8 was inserted into the oil return hole 74 by communicating with it.

[0007] Furthermore, an oil separator 8 made of a wire wound into a coil is installed in the through hole 71 of the cylinder 31 forming the discharge passage 7, and a mounting surface 33c of the rear head 33 to the cylinder 31 is provided. It is preferable that a recessed portion 74a that opens downward is provided on the lower surface 31b of the opposing cylinder 31 to form an oil return hole 74 into which the end portion 81 of the oil separator 8 is inserted.

[0008]

[Operation] The gas refrigerant discharged from the discharge hole 33b of the rear head 33 into the discharge muffler 52 comes into contact with the oil separator 8 when passing through the discharge passage 7, and is mixed into the gas refrigerant due to this contact. The lubricating oil is separated, and the separated lubricating oil moves downward along the inner surface of the oil separator 8 and is returned to the oil return hole 74 by the end portion 81 inserted into the oil return hole 74. The oil sump 1 is guided through the oil return hole 74 without coming into contact with the discharged gas refrigerant.
It is possible to return to a. In this way, since the discharged gas refrigerant immediately after discharge, which contains the largest amount of lubricating oil, is separated before being discharged into the primary discharge space 10 in the casing 1, it can be effectively separated. Since the lubricating oil can be returned to the oil reservoir 1a without touching the discharged gas refrigerant, the separated oil will not be mixed in again, and therefore will not be mixed in with the gas refrigerant in the primary discharge space 10. This reduces the amount of lubricating oil used, and the leakage of lubricating oil to the outside of the casing can be reduced accordingly.

[0009] Furthermore, an oil separator 8 made of a wire wound into a coil is installed in the through hole 71 of the cylinder 31 forming the discharge passage 7, and a mounting surface 33c of the rear head 33 to the cylinder 31 is provided. The oil return hole 74 can be easily opened by providing a recessed portion 74a opening downward in the lower surface 31b of the opposing cylinder 31 to form an oil return hole 74 into which the end portion 81 of the oil separator 8 is inserted. When the oil separator 8 is installed inside the discharge passage 7, the through hole 71 of the cylinder 31 that forms the discharge passage 7 is removed before the front head 32 and the rear head 33 are attached to the cylinder 31. The oil separator 8 is installed inside the oil separator 8, and the end portion 81 of the oil separator 8
The oil separator 8 can be assembled into the discharge passage 7 in advance while correctly positioning the end portion 81 with respect to the oil return hole 74 by simply fitting the end portion 81 into the recessed portion 74a. Even though the oil separator 8 is installed inside, the front head 32 and the rear head 33 can be installed in the same way as when the oil separator 8 is not installed, and the ease of assembly can be improved. .

0010

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a rotary compressor according to the present invention will be described below with reference to the drawings.

The rotary compressor shown in FIG. 1 has a rotor 21 at the top of a sealed casing 1 with an oil reservoir 1a at the bottom.
A motor 2 consisting of a stator 22 and a cylinder 31 is installed below the motor 2.
A compression element 3 consisting of a front head 32 and a rear head 33 disposed at vertical positions of 1 is installed inside, and the front head 32 and rear head 33 are provided with bearing parts 32a and 33a extending in the vertical direction, and each of these bearing parts 32
A drive shaft 4 is supported by bearings on a and 33a, and the upper end of the drive shaft 4 is connected to the motor 2, while a roller 34 is inserted into an eccentric shaft portion 41 of the drive shaft 4.

Further, the cylinder 31 is provided with a suction hole 31a for sucking a low-pressure gas refrigerant, and the front head 32 is provided with a discharge hole 32b for discharging compressed gas refrigerant, and a discharge muffler 51 is attached. , the discharge muffler 51 forms an upper discharge chamber 61 constituting one of the discharge chambers, while the rear head 3
3 is also provided with a discharge hole 33b through which the compressed gas refrigerant is discharged, and a discharge muffler 52 is attached to the discharge muffler 5.
2 forms a lower discharge chamber 62 constituting another one of the discharge chambers. Furthermore, continuous through holes 71, 72, 73 are provided in the cylinder 31, the front head 32, and the rear head 33, respectively, so that the lower discharge chamber 62 and the upper discharge chamber 6 are provided with continuous through holes 71, 72, and 73.
A discharge passage 7 is formed which communicates with 1.

[0013] Low-pressure gas refrigerant is sucked into the cylinder 31 from the suction hole 31a by the rotation of the roller 34 accompanying the rotational drive of the motor 2, and the sucked gas refrigerant is compressed by the rotation of the roller 34. The compressed gas refrigerant is discharged from the discharge holes 32b and 33b into the upper and lower discharge chambers 61 and 62, and the gas refrigerant discharged into the lower discharge chamber 62 is The gas refrigerant is allowed to pass through the discharge passage 7 and once flowed out into the upper discharge chamber 61, and then discharged from the upper discharge chamber 61 into the primary discharge space 10 in the casing 1 together with the gas refrigerant discharged from the discharge hole 32b.

[0014] Accordingly, in the rotary compressor of the present invention, an oil separator 8 made of a wire wound in a coil is installed in the discharge passage 7, and the oil reservoir 1a is provided in the lower part of the discharge passage 7. The end portion 81 of the oil separator 8 is connected to the oil return hole 74 which opens to the oil return hole 74.
Insert.

Specifically, as shown in FIGS. 2 and 3, the mounting surface 33c of the rear head 33 to the cylinder 31
A recessed portion 74a extending from the through hole 71 provided in the cylinder 31 to the side wall of the cylinder 31 and opening downward is provided on the lower surface 31b of the cylinder 31 facing the
When the rear head 33 is disposed on the cylinder 31, the mounting surface 33c of the rear head 33 and the recessed portion 74
a communicates with the discharge passage 7, and the oil reservoir 1a
In addition, the oil separator 8 is installed inside the through hole 71 of the cylinder 31, and the oil separator 8 is made of an iron member. A wire rod is wound into a coil so as to contact the inner surface of the through hole 71, and the length of this coil portion is formed to be shorter than the length of the through hole 71, so that the end portion 81 on the rear head side of the oil separator 8 is formed. It is formed so that it can be fitted into the recessed portion 74a. Note that the recessed portion 74a is
Although it is formed on the cylinder 31, it may be formed on the mounting surface 33c of the rear head 33, or on both surfaces 31d.
, 33b.

Next, a method for installing the oil separator 8 into the discharge passage 7 will be explained.
Before fixing the front head 32 and the rear head 33 to
The oil separator 8 is inserted into the oil separator 8, the end portion 81 of the oil separator 8 is fitted into the recess 74a, and then the front head and rear head 33 are inserted into the cylinder 31.
are installed and fixed with stay bolts. When stacking these heads 32 and 33 on the cylinder 31,
The through holes 72 and 73 provided in each head 32 and 33 are aligned so as to be continuous with the through hole 71 provided in the cylinder 31, and fixed by the stay bolts.

As described above, according to the embodiment described above,
The gas refrigerant discharged from the discharge hole 33b of the rear head 33 into the discharge muffler 52 flows while coming into contact with the oil separator 8 when passing through the discharge passage 7, and due to this contact, the gas refrigerant is Contaminating lubricating oil is effectively separated. The separated lubricating oil then moves downward in a spiral manner along the inner surface of the coil portion of the oil separator 8 until the end portion 81 of the oil separator 8 is inserted into the oil return hole 74. Therefore, the separated lubricating oil is guided to the oil return hole 74 by the end portion 81, and is returned from the oil return hole 74 to the oil reservoir 1a without coming into contact with the discharged gas refrigerant.

[0018] In this way, the discharged gas refrigerant immediately after discharge, which contains the largest amount of lubricating oil, is separated before being discharged into the primary discharge space 10 in the casing 1, so that it can be effectively separated. Moreover, since this separated lubricating oil can be returned to the oil reservoir 1a without coming into contact with the discharged gas refrigerant, the separated oil will not be mixed into the discharged gas refrigerant again. The amount of lubricating oil mixed into the gas refrigerant in the primary discharge space 10 can be reduced, and the leakage of lubricating oil to the outside of the casing can be reduced accordingly. Incidentally, an oil separation plate may be provided on the non-compressible element side of the motor 2, and by doing so, oil separation can be performed more effectively by using the oil separation body 8 and the oil separation plate together.

As a result, the amount of lubrication inside the compressor can be maintained,
Seizure of the sliding portion of the compression element 3 can be prevented, and since the leakage of lubricating oil into the system can be reduced, a decrease in heat exchange efficiency can also be prevented.

In addition, an oil separator 8 made of a wire wound in a coil is installed in the through hole 71 of the cylinder 31 forming the discharge passage 7, and a mounting surface 33c of the rear head 33 to the cylinder 31 is provided. A recessed portion 74a that opens downward is provided on the lower surface 31b of the opposing cylinder 31,
Oil return hole 74 into which the end portion 81 of the oil separator 8 is inserted
By forming the oil return hole 74, the oil return hole 74 can be easily formed, and when the oil separator 8 is installed inside the discharge passage 7, before the front head 32 and the rear head 33 are attached to the cylinder 31, The oil separator 8 is installed inside the oil separator 8 in advance, and the end portion 8 of the oil separator 8
1 into the recessed portion 74a, the oil separator 8 can be pre-assembled in the discharge passage 7 while correctly positioning the end portion 81 with respect to the oil return hole 74. Even though the oil separator 8 is installed inside, the front head 32 and the rear head 33 can be installed in the same way as when the oil separator 8 is not installed, and the ease of assembly can be improved. .

[0021]

As explained above, the rotary compressor of the present invention has an oil separator 8 in which a wire is wound in a coil in the discharge passage 7, and an oil separator 8 in which a wire is wound in a coil shape in the lower part of the discharge passage 7. An oil return hole 74 opened to the oil reservoir 1a is connected to the oil return hole 74, and the end portion 81 of the oil separator 8 is connected to the oil return hole 74.
Since the gas refrigerant is inserted into the discharge muffler 52 from the discharge hole 33b of the rear head 33, the gas refrigerant is brought into contact with the oil separator 8 when passing through the discharge passage 7, and this contact causes the gas refrigerant to separating the lubricating oil mixed into the oil return hole 74, and guiding the separated lubricating oil to the oil return hole 74 by the end portion 81 inserted into the oil return hole 74;
Since the oil can be returned to the oil reservoir 1a from the oil return hole 74, the discharged gas refrigerant containing the largest amount of lubricating oil can be separated before being discharged into the primary discharge space 10 in the casing 1. This allows for effective separation, and the separated lubricating oil can be returned to the oil reservoir 1a without coming into contact with the discharged gas refrigerant, thereby preventing the separated oil from mixing with the discharged gas refrigerant again. Therefore, the amount of lubricating oil mixed into the gas refrigerant in the primary discharge space 10 can be reduced, and the leakage of lubricating oil to the outside of the casing can be reduced accordingly.

As a result, the amount of lubrication inside the compressor can be maintained,
Seizure of the sliding portion of the compression element 3 can be prevented, and since the leakage of lubricating oil into the system can be reduced, a decrease in heat exchange efficiency can also be prevented.

Furthermore, an oil separator 8 made of a wire wound into a coil is installed in the through hole 71 of the cylinder 31 forming the discharge passage 7, and a mounting surface 33c of the rear head 33 to the cylinder 31 is provided. A recessed portion 74a that opens downward is provided on the lower surface 31b of the opposing cylinder 31,
Oil return hole 74 into which the end portion 81 of the oil separator 8 is inserted
By forming the oil return hole 74, the oil return hole 74 can be easily formed, and when the oil separator 8 is installed inside the discharge passage 7, before the front head 32 and the rear head 33 are attached to the cylinder 31, The oil separator 8 is installed inside the oil separator 8 in advance, and the end portion 8 of the oil separator 8
1 into the recessed portion 74a, the oil separator 8 can be pre-assembled in the discharge passage 7 while correctly positioning the end portion 81 with respect to the oil return hole 74. Even though the oil separator 8 is installed inside, the front head 32 and the rear head 33 can be installed in the same way as when the oil separator 8 is not installed, and the ease of assembly can be improved. .

[Brief explanation of drawings]

FIG. 1 is a partially cutaway sectional view showing an embodiment of a rotary compressor of the present invention.

FIG. 2 is an enlarged sectional view of the main parts of the rotary compressor of the present invention.

FIG. 3 is an enlarged plan view of the main parts as seen from the bottom side of the cylinder.

FIG. 4 is an explanatory diagram showing a conventional example.

FIG. 5 is an explanatory diagram showing a conventional example.

[Explanation of symbols]

1 Sealed casing 1a Oil sump 2 Motor 3 Compression element 31 Cylinder 31b Bottom surface 32 Front head 33 Rear head 33b Discharge hole 33c Mounting surface 52 Discharge muffler 7 Discharge passage 71, 72, 73, through hole 74 Oil return hole 74a Recessed part 8 Oil separation body 81 End part 10 Primary discharge space

Claims (2)

[Claims] 1. A compression element 3 comprising a motor 2 in the upper part of a sealed casing 1, a front head 32, a rear head 33, and a cylinder 31 in the lower part, and at least the rear head 33 having a discharge hole 33b and a discharge muffler 52. An oil reservoir 1a is provided at the bottom of the casing 1, and through holes 72, 73, 71 are provided in each of the heads 32, 33 and the cylinder 31, so that the inside of the discharge muffler 52 is connected to the primary discharge of the casing 1. In a rotary compressor forming a discharge passage 7 communicating with a space 10, an oil separator 8 made of a wire wound in a coil is installed in the discharge passage 7, and the oil separator 8 is disposed in the lower part of the discharge passage 7. Reservoir 1a
The oil return hole 74 opened to the
4, a rotary compressor characterized in that an end portion 81 of the oil separator 8 is inserted. 2. An oil separator 8 made of a wire wound into a coil is installed in a through hole 71 of a cylinder 31 forming a discharge passage 7, and is arranged opposite to a mounting surface 33c of a rear head 33 to the cylinder 31. 2. The rotary compressor according to claim 1, wherein a recessed portion 74a opening downward is provided in the lower surface 31b of the cylinder 31 to form an oil return hole 74 into which the end portion 81 of the oil separator 8 is inserted.