JPH06330867A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent any power loss from occurring by recovering oil in an oil sump of a high pressure chamber positively without collecting the lubricating oil too much in a low pressure chamber even if the inner part of a casing is partitioned off into each of these low and high pressure chambers, keeping of any drop in an oil level in this high pressure chamber's oil sump, and to prevent a scroll part and an Oldham's ring or the like being immersed in the lubricating oil in the low pressure chamber. CONSTITUTION:A partition wall 12a is installed in the vertical intermediate part of a casing 1, partitioning off to a low pressure chamber 61 where an inlet pipe 14 is opened, and a high pressure chamber 62 where a discharge pipe 15 is opened, while a compressive element 2 is installed in the low pressure chamber 61 and a motor M in the high pressure chamber 62 for trimming, respectively. In addition, there is provided a connecting passage 7 to be interconnected to a discharge port 23 of the compressive element 2, and this passage 7 is opened to the high pressure chamber 62. In succession, the inlet pipe 14 is rushed into the low pressure chamber 61, interconnecting it to a suction port 27 of the compressive element 2, and an oil return pipe 81 to be connected to an oil sump 61a to be installed on a bottom part of the low pressure chamber 61 is opened into a rushing part (a point midway in a suction gas passage) of the inlet pipe 14.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a scroll compressor in which a compression element having first and second scrolls is installed in an upper part of a casing, and a motor for driving the compression element is installed in a lower part of the casing. Regarding

[0002]

2. Description of the Related Art Conventionally, a scroll compressor of this type generally has a compression element, which is composed of a first scroll and a second scroll supported by a bearing housing, disposed in an upper part of a hermetically sealed casing. A motor for driving the second scroll via a drive shaft is arranged in the lower part of the inside, while a suction pipe is opened in the casing, and a discharge pipe is connected to a discharge port of the compression element, A low-pressure dome type in which the low-pressure gas refrigerant that has flowed into the casing is sucked into the compression element and compressed, and then the compressed high-pressure gas refrigerant is discharged from the discharge pipe to the outside of the casing through the discharge port. Scroll compressors are known.

However, in the above-mentioned low-pressure dome type scroll compressor, since the low-pressure gas refrigerant is once introduced into the casing to cool the motor, the low-pressure gas refrigerant is sucked into the compression element for compression. There is a problem that the low-pressure gas refrigerant is heated by the motor and the compression efficiency of the compression element is reduced.

Therefore, a suction pipe connected to the casing is inserted into the suction port of the compression element, the suction pipe is connected to the suction port of the compression element, and the discharge port of the compression element is opened in the casing. Then, the high-pressure gas refrigerant compressed by the compression element is once discharged into the casing to cool the motor, and then the high-pressure gas refrigerant is discharged to the outside of the casing from the discharge pipe connected to the lower side of the casing. A high-pressure dome type scroll compressor has been proposed.

However, in the above-mentioned high-pressure dome type scroll compressor, the suction pipe and the compression element protruding into the casing are heated by the high-pressure gas refrigerant discharged into the casing, so that There is a problem that the low-temperature suction refrigerant to be introduced is heated and the compression efficiency in the compression element is still reduced.

Therefore, in order to prevent the compression efficiency from deteriorating, it is described in Japanese Patent Application Laid-Open No. 3-74590, and as shown in FIG. 9, the inside of the casing A is separated by a partition wall B into a low pressure chamber C and a high pressure chamber. It is divided into a chamber D, the compression element E is disposed in the low pressure chamber C, the suction pipe F is opened, the motor M is disposed in the high pressure chamber D, and the discharge is performed. A pipe H is opened, and a discharge chamber J, which communicates with the discharge port E1 of the compression element E and is separated from the low pressure chamber C, is separately formed above the compression element E and communicates with the discharge chamber J. The one end side of the passage I is opened, and the other end side of the communication passage I is opened to the high pressure chamber D, and the high pressure gas refrigerant discharged from the discharge port E1 is discharged through the discharge chamber J. Discharge pipe that is sent from the communication passage I to the high pressure chamber D and opens into the high pressure chamber D Is discharged from the casing A to the outside of the casing A so that the compression element E is not heated by the high-pressure gas refrigerant, the compression efficiency of the compression element E is prevented from lowering, and the motor M is cooled by the high-pressure gas refrigerant. I did so.

[0007]

However, generally, in the scroll compressor, the second scroll K of the compression element E is revolved in association with the drive shaft G of the motor M, and therefore the drive shaft is driven. G bearings R and S,
Since it is necessary to lubricate the fitting portion between the eccentric pin portion N of the drive shaft G and the bearing portion L of the second scroll K,
Since the lubricating oil is pumped up from the oil sump O formed in the bottom portion of the casing A through the oil supply passage P formed in the drive shaft G, the scroll compression forming the low pressure chamber C and the high pressure chamber D is performed. In the machine, the high pressure chamber D
When the lubricating oil pumped from the oil reservoir O at the bottom and lubricating the bearing portion L of the fitting portion located in the low pressure chamber C leaks into the low pressure chamber C, the lubricating oil is leaked to the bottom of the low pressure chamber C. It will accumulate. That is, when the lubricating oil collects at the bottom of the low pressure chamber C, the lubricating oil cannot be recovered in the oil sump O of the high pressure chamber D as it is.
After accumulating up to the suction port height, the gas refrigerant is sucked from the suction port and returned to the high pressure chamber.
As a result, the oil level in the oil sump O of the high-pressure chamber D is lowered, and the lubrication from the lubrication passage P cannot be sufficiently lubricated, which causes a problem of insufficient lubrication. If too much oil accumulates in the low-pressure chamber C, the second scroll K, the Oldham ring Q disposed on the lower side of the second scroll K, etc. will be submerged in the oil, resulting in power loss. Also occurs.

The present invention has been made in view of the above problems, and an object thereof is to prevent lubricating oil from being excessively accumulated in the low pressure chamber even if the casing is divided into a high pressure chamber and a low pressure chamber. The purpose is to positively collect oil in the oil sump of the high-pressure chamber to prevent the oil level in the oil sump from lowering.

[0009]

In order to achieve the above object, the present invention according to claim 1 provides a casing 1
In a scroll compressor in which a compression element 2 having first and second scrolls 21 and 22 and a motor M for driving the compression element 2 are installed, a partition wall 12a is provided at an upper and lower intermediate portion of the casing 1. A low pressure chamber 61 in which the suction pipe 14 is open and a high pressure chamber 62 in which the discharge pipe 15 is open, the low pressure chamber 61 is internally provided with the compression element 2, and the high pressure chamber 62 is internally provided with the motor M. In addition, the communication passage 7 communicating with the discharge port 23 of the compression element 2 is provided, and the communication passage 7 is opened to the high pressure chamber 62, while the suction pipe 14 reaches the suction port 27 of the compression element 2. The oil return passage 8 communicating with the low pressure chamber oil sump 61a provided at the bottom of the low pressure chamber 61 is opened in the middle of the intake gas passage.

Further, in the invention described in claim 2, in the invention described in claim 1, the low-pressure chamber 61 for accommodating the compression element 2 is provided on the upper part of the casing 1, and the high-pressure chamber 62 for accommodating the motor M is provided on the lower part of the casing 1. It was set up in.

According to a third aspect of the present invention, in the second aspect of the invention, the first scroll 21 is a fixed scroll fixed to the casing 1, and the second scroll 22 is the drive shaft 4 of the motor M. As a movable scroll that is driven in conjunction with, a bearing portion 31 that supports the drive shaft 4 is provided in the bearing housing 3 that supports the second scroll 22, and an oil return passage opening to an oil sump 61a of the low pressure chamber 61. 8, and the second scroll 22
To the suction port 2 of the compression element 2 communicating with the oil return passage 8.
The communication hole 22d opening to the 7 side is provided.

[0012] According to a fourth aspect of the present invention, in the first aspect of the invention, a low pressure chamber 61 for accommodating the compression element 2 is provided under the casing 1, and a high pressure chamber 62 for accommodating the motor M is provided.
Is provided on the upper part of the casing 1.

Further, the invention of claim 5 is the same as claim 1.
Alternatively, in the invention of claim 2 or claim 4, the suction pipe 14 is made to protrude into the low pressure chamber 61 to communicate with the suction port 27 of the compression element 2,
The oil return pipe 81 is opened in the plunging part.

The invention according to claim 6 is the same as claim 1.
Alternatively, in the invention according to claim 2 or claim 4, the first scroll 21 is a fixed scroll fixed to the casing 1, and the second scroll 22 is driven in association with the drive shaft 4 of the motor M. The oil return pipe 81 is attached to the first scroll 21 as a movable scroll.
That is, the oil return pipe 81a is opened to the suction port 27 side of the compression element 2 while supporting a.

[0015]

In the invention of claim 1, the low pressure chamber oil sump 6
Even if oil leaks from the oil 1a, the oil return passage 8 allows the oil sump 61a to communicate with the intake gas passage. Therefore, depending on the flow velocity of the intake gas flowing through the intake gas passage. The low-pressure chamber reservoir 6 is generated by the generated dynamic pressure.
The oil accumulated in 1a is sucked up into the suction gas passage, and the sucked up oil is sucked into the compression element 2 together with the suction gas, and is discharged from the discharge port 23 to the high pressure chamber 62 through the communication passage 7. The oil accumulated in the oil sump 61a of the low pressure chamber 61 is efficiently recovered to the oil sump in the high pressure chamber 62, and the oil sump of the high pressure chamber 62 is stored during the operation of the compressor. It is possible to prevent a decrease in the amount of oil, and to solve the shortage of oil supply to each bearing.

According to the second aspect of the present invention, the high-pressure chamber 62 is formed on the lower side of the casing 1 and the motor M is installed in the high-pressure chamber 62. Can be formed in the lower part of the high-pressure chamber 62 in which the motor is installed, that is, on the side opposite to the compression element of the motor M.
A bearing support for supporting the motor M is provided.
Since a space is formed between the bearing support disposed below the bottom of the motor M and the bottom of the high-pressure chamber 62, the oil surface of the oil reservoir provided at the bottom of the high-pressure chamber 62 is located below the motor M. It is possible to separate them, and therefore it is possible to reduce the disturbance of the oil surface in the high pressure chamber oil sump due to the rotation of the motor M.

According to the third aspect of the present invention, when the compression element 2 is arranged on the upper part of the casing 1, the compression is performed only by processing the bearing housing 3 and the second scroll 22 serving as a movable scroll. Since the suction port 27 side of the element 2 and the low pressure chamber oil sump 61a can be communicated with each other, the oil return passage 8 can be formed without providing a separate pipe, and the cost of parts for forming the return passage 8 can be reduced. The oil can be recovered from the low pressure chamber oil sump 61a while being reduced.

In the invention according to claim 4, the motor M is
Since the high pressure chamber 62 which houses the compressor 1 is formed in the upper part of the casing 1 and the low pressure chamber 61 which houses the compression element 2 is formed in the lower part, the space formed between the partition wall 12a and the motor M is used for the high pressure chamber oil. A reservoir can be formed, and therefore, the axial length of the casing 1 can be shortened by that much, and the entire compressor can be downsized. Moreover, since the high-pressure chamber oil sump is provided above the compression element 2, it is possible to supply oil to the lubrication location in the compression element 2 by the weight of the oil and differential pressure lubrication, and to the lubrication location. Will be able to refuel well.

Further, in the invention according to claim 5, since the oil return pipe 81 is opened to the suction pipe 14, the low pressure chamber oil sump 61a is utilized by utilizing the flow velocity of the suction gas flowing through the suction pipe 14. The oil can be sucked up more effectively, and therefore the oil can be returned to the high pressure chamber 62 more efficiently.

Further, in the invention according to claim 6, an oil return pipe 81 is attached to the first scroll 21 which is a fixed scroll.
Since the a is supported, the first scroll 21
Before the oil return pipe 8 is installed in the casing 1.
1a can be connected to and supported by the first scroll 21, or can be simultaneously connected when the first scroll 21 is assembled in the casing 1. Therefore, the oil return pipe 81 can be assembled well. While the oil sump 61
It is possible to favorably recover the oil from a.

[0021]

EXAMPLE A first example will be described with reference to FIG. The scroll compressor shown in FIG. 1 is a revolving scroll, and the compression element 2 is disposed on the one side plane of the end plate 21a.
The first scroll 21 is a fixed scroll having a downwardly projecting b, and a bearing housing 3 fixed in the closed casing 1 so as to be revolvable, and the spiral body 22b is projected upward on one plane of the end plate 22a. This spiral body 22
b is composed of a scroll 21b of the first scroll 21 and a second scroll 22 which is a movable scroll engaged with the spiral body 21b in a vertical direction, and the compression element 2 is arranged in the upper portion of the hermetic casing 1. The second scroll 2 is installed at the bottom of the casing 1 via a drive shaft 4.
A motor M for driving 2 and a motor M located below the motor M,
A bearing support 5 having a lower bearing portion 51 that supports the lower side of the drive shaft 4 via a bearing 51a is provided.

A shaft portion 41 is formed on the upper portion of the drive shaft 4, and the shaft portion 41 is supported by an upper bearing portion 31 formed in the bearing housing 3 via a bearing 31a, and the shaft portion 41 is formed. The portion 41 is formed with a boss portion 41a that fits into an eccentric pin portion 22c provided on the lower surface side of the second scroll 22, and the eccentric pin portion 2 is attached to the boss portion 41a.
2c is fitted and interlocked with the drive of the drive shaft 4 to revolve the second scroll 22, and a bearing 41b is provided between the boss 41a of the shaft 41 and the pin 22c. It is provided.

The bearing housing 3 is provided with an Oldham ring 32 for preventing rotation of the second scroll 22, and a surface of the bearing housing 3 facing the lower surface of the second scroll 22 is not a thrust bearing portion 33. The thrust load acting on the second scroll 22 is received. And the drive shaft 4
Is provided with an oil supply passage 42 penetrating the drive shaft 4 in the axial direction, so that the oil in the oil sump 62 a in the lower portion of the casing 1 is supplied to the bearing 51 of the lower bearing portion 51 via the oil supply passage 42.
a to the bearings 41b, and further, the oil supplied to the bearings 41b is supplied to the bearings 31a of the upper bearing portion 31,
In addition, the thrust bearing portion 33 is supplied.

However, in the above-described first embodiment, as shown in FIG.
As shown in FIG. 2, the closed casing 1 is formed of a lid body 11, an upper body 12 and a lower body 13, and an opening side of the upper body 12 that fits with the lower body 13 is inward. It is bent to continuously form a partition wall 12a that divides the inside of the closed casing 1, and an inner end edge of the partition wall 12a is raised upward to form a rising portion 12b.

By fitting the upper body 12 inside the lower body 13 and fitting the lid 11 to the upper body 12, the low pressure chamber 61 is formed between the lid 11 and the upper body 12. And the high pressure chamber 62 is formed by the lower body 13 and the partition wall 12a formed in the upper body 12, and the compression element 2 and the bearing housing 3 are housed in the low pressure chamber 61. At the same time, the suction pipe 14 is opened, and the upper bearing portion 31 of the bearing housing 3 is fitted to the rising portion 12b of the partition wall 12a to form the low pressure chamber 61 in a sealed state, while the high pressure chamber 62 is The motor M and the bearing support 5 are internally provided, and the discharge pipe 15 is opened. Further, on the upper surface side of the partition wall 12a, an oil sump 61a of the low pressure chamber 61 for accumulating oil after lubricating the sliding parts such as the thrust bearing part 33 is formed.

In addition, at the center of the upper surface of the end plate 21a of the first scroll 21, the scrolls 21b and 22b are formed.
A cylindrical discharge passage 24 that communicates with a discharge port 23 that opens at the center of the discharge port 24 is formed in a protruding manner, and a sealing lid 26 that forms a discharge chamber 25 is fitted into the discharge passage 24. 11 The central part is penetrated. A communication passage 7 is provided, one end of which opens into the discharge chamber 25 from the side surface of the sealing lid 26 and the other end of which opens into the high-pressure chamber 62. The discharge gas is discharged from the discharge port 23 to the high pressure chamber 62 by communicating with the discharge port 23 of the compression element 2 via.

Then, as shown in FIG.
1, the suction pipe 14 opened to 1 is made to rush up to the suction port 27 of the compression element 2 so as to be directly communicated with the suction port 27, and to the lower side surface of the rush portion of the suction pipe 14 to the low pressure chamber 61. , One end of which is connected to the oil sump 61a provided at the bottom of the low pressure chamber 61, that is, the oil sump 61a formed on the upper surface of the partition wall 12a, and the oil return pipe 81 is sucked into the oil sump 61a. An oil return passage 8 is formed by the oil return pipe 81, which is opened in the protruding portion of the pipe 14.

Thus, during operation of the scroll compressor,
Even if oil leaks from the oil reservoir 61a formed at the bottom of the low pressure chamber 61, the oil return pipe 81
Since the oil sump 61a is communicated with the inside of the suction pipe 14 by the dynamic pressure generated by the flow velocity of the suction gas flowing through the suction pipe 14, the oil accumulated in the oil sump 61a is absorbed by the suction pipe 14 The sucked oil is ejected in a mist state in the suction pipe 14 by the ejector effect, is sucked into the compression element 2 together with the suction gas, and is discharged from the discharge port 23. , And is sent to the high-pressure chamber 62 via the communication passage 7. As a result, the oil accumulated in the oil sump 61a of the low pressure chamber 61 is stored in the oil sump 62a of the high pressure chamber 62.
It is possible to efficiently collect the oil and to prevent the oil amount in the oil sump 62a on the high-pressure chamber 62 side from decreasing during the operation of the compressor, so that the shortage of oil supply to each bearing can be eliminated.

Further, in the first embodiment, the high pressure chamber 62 is formed on the lower side of the casing 1, and the high pressure chamber 6 is formed.
2 is equipped with the motor M, the high pressure chamber oil sump 62a
Can be formed on the side opposite to the compression element of the motor M, and the bearing support 5 that normally supports the drive shaft 4 is provided below the high-pressure chamber 62.
Moreover, since a space for the oil sump is formed below the bearing support 5, the bearing support 5 is interposed between the lower end of the motor M and the high pressure chamber oil sump 62a, The oil surface of the high-pressure chamber oil sump 62a can be separated from the lower end of the motor M, so that the oil surface disturbance of the high-pressure chamber oil sump 62a due to the rotation of the motor M can be reduced.

In the first embodiment, the low pressure chamber 6
The suction pipe 14 in which the flow velocity of the suction gas is the highest in 1
Since the oil return pipe 81 is opened, the oil suction force from the oil sump 61a is large and the oil can be efficiently returned to the high pressure chamber 62.

Next, a second embodiment will be described with reference to FIG. The second embodiment is similar to the first embodiment in that the compression element 2 is arranged above the casing 1 and the motor M is arranged below the casing 1.
The scroll 21 is a fixed scroll that is fixed to the casing 1, and the second scroll 22 is a movable scroll that is driven in conjunction with the drive shaft 4 of the motor M.
The suction pipe 14 that opens into the low-pressure chamber 61 also penetrates to reach the suction port 27 of the compression element 2 and the suction port 27.
And the oil return passage 8 is constructed as shown below. That is, the oil return passage 8 is formed by the oil return pipe 81a whose one end side is bent in a U shape, and is opened to the end plate 21a of the first scroll 21 on the suction port 27 side of the compression element 2. The oil sump 61a is formed by forming a through hole 21c, and connecting the end of the oil return pipe 81a on the side bent in a U-shape to the other end at the bottom of the low pressure chamber 61. The oil return pipe 81a is formed so as to open to the suction port 27 side of the compression element 2, and the oil return pipe 81a is connected to the through hole 2
By connecting to 1c, it is formed so as to be supported by the first scroll 21.

In this case, since the oil return pipe 81a is supported by the first scroll 21 which is a fixed scroll, the oil return pipe 81 is connected to the suction pipe 14 as in the first embodiment. It is possible to improve the assembling property more than when. That is, the connection of the oil return pipe 81 to the suction pipe 14 in the first embodiment is performed by arranging the compression element 2 in the casing 1 and then connecting the suction pipe 14 from the outside of the casing 1 to the compression element. The oil return pipe 81 has to be connected in a narrow space after it has been rushed up to the suction port 27 of No. 2, and oil suction is good, but assembly is difficult, whereas Second
According to the embodiment, before disposing the first scroll 21 in the casing 1, the oil return pipe 81a is connected to the first scroll 21 in advance, or the first scroll 21 is placed in the casing 1. Even when connecting at the same time when assembling, the fitting side of the upper body 12 with the lid 11 is open at the time of assembling, and the through hole formed on the upper surface of the first scroll 21 from the opening. 21c by connecting to the oil return pipe 81a
The connection to the intake gas passage can be easily performed, and the assembling can be favorably performed.

Another embodiment of the oil return passage 8 will be described with reference to FIGS. 4 and 5 showing a third embodiment. The oil return passage 8 of the third embodiment has the first and second oil return passages. As in the second embodiment, the compression element 2 is placed on the top of the casing 1,
Further, in the case where the motor M is disposed in the lower portion of the casing 1, the motor M has an upper bearing portion 31 that supports the drive shaft 4 of the motor M, and supports the lower surface side of the second scroll 22 that is a movable scroll. In the bearing housing 3 having the thrust bearing portion 33, one end is opened to the oil sump 61a formed in the bottom of the low pressure chamber 61, and the other end is opened to the lower surface side of the end plate 22a of the second scroll 22. The passage 8 is formed and the second scroll 2 is formed.
The end plate 22a of No. 2 communicates with the oil return passage 8 and forms a communication hole 22d that opens toward the suction port 27 side of the compression element 2. Further, since the communication hole 22d formed in the second scroll 22 moves along with the revolving drive of the second scroll 22, it is possible to continuously supply the oil from the oil return passage 8 to the communication hole 22d. On the upper surface of the thrust bearing portion 33 of the bearing housing 3, the oil return passage 8 is opened, and a large-diameter circular concave portion 82 having a size such that the communication hole 22d is always opened is formed.

In doing so, the above-mentioned first and second
As shown in the embodiment, the oil return passage 8 is connected to the oil return pipe 8
Since it is not necessary to form the oil return passage 8 without using a separate pipe, it is possible to reduce the cost of parts.

Further, a fourth embodiment will be described with reference to FIGS. 6 and 7. The scroll compressor shown in FIG. 6 is a revolving scroll, in which the compression element 2 is a fixed scroll in which a scroll 21b is projected upward on one side plane of an end plate 21a, and a first scroll 21 inside the closed casing 1. It is supported by a fixed bearing housing 3 so as to be able to revolve, and a spiral body 22b is projected downward on one side plane of an end plate 22a. The spiral body 22b is vertically meshed with the spiral body 21b of the first scroll 21. And a second scroll 22 which is a movable scroll engaged with each other in a circular shape. The compression element 2 is arranged on the lower side of the closed casing 1, and the drive shaft 4 is provided on the upper side of the casing 1. A motor M for driving the second scroll 22 via the motor M, and a bearing 5 located above the motor M and on the upper side of the drive shaft 4.
Bearing support 5 including bearing portion 51 supported via 1a
And are arranged.

A shaft portion 41 is formed below the drive shaft 4, and the shaft portion 41 is supported by a bearing portion 31 formed in the bearing housing 3 via a bearing 31a.
The shaft portion 41 is formed with a boss portion 41a that fits into an eccentric pin portion 22c that is provided on the side of the second scroll 22 that is opposite to the spiral body forming side, and the eccentric pin portion 22c is fitted into the boss portion 41a. The second scroll 22 is driven to revolve, and the second scroll 22 is revolved.
The bearing 41b is provided between it and 2c.

Further, the bearing housing 3 is provided with an Oldham ring 32 for preventing rotation of the second scroll 22.

Therefore, in the fourth embodiment, as shown in FIGS. 6 and 7, the closed casing 1 is composed of the upper body 12 and the lower body 13, while the bearing housing 3 is provided with the lower body. A partition wall 34 is formed which is in intimate contact with the entire circumference of the inner peripheral surface of the partition wall 13. When the upper body 12 and the lower body 13 are fitted to each other by the flange 34, a partition wall for partitioning the inside of the closed casing 1 is formed. 12a is formed.

By fitting the lower body 13 and the upper body 12 to each other, the lower body 13 and the partition wall 12a form a low-pressure chamber 61, and the upper body 12 and the partition wall 12a. Due to the high pressure chamber 62
The low pressure chamber 61 is provided with the compression element 2 and the suction pipe 14 is opened, and the high pressure chamber 62 is provided with the motor M and the bearing support 5 and the discharge is performed. The tube 15 is opened. Further, an oil sump 62a of the high pressure chamber 62 is formed on the upper surface side of the partition wall 12a, one end of the high pressure chamber oil sump 62a of the bearing housing 3 is opened, and the other end of the inside of the bearing portion 31 is formed. By forming the oil supply passage 35 opening to the circumferential side,
The oil in the high-pressure chamber oil sump 62a is supplied between the bearing portion 31, the eccentric pin portion 22c, and the boss portion 41a. A low pressure chamber oil sump 61a is formed below the position where the suction pipe 14 is disposed at the bottom of the low pressure chamber 61 to store oil after lubricating each sliding portion.

Further, at the center of the end plate 21a of the first scroll 21, a discharge port 23 opening to the center of each of the scrolls 21b and 22b is provided, and the discharge port 23 and the high pressure chamber 62 are provided. The discharge gas discharged from the discharge port 23 is sent to the high-pressure chamber 62 by communicating with the communication passage 7.

Then, as shown in FIG. 7, the low-pressure chamber 6
1, the suction pipe 14 opened to 1 is made to rush up to the suction port 27 of the compression element 2 so as to be directly communicated with the suction port 27, and to the lower side surface of the rush portion of the suction pipe 14 to the low pressure chamber 61. , One end of which is connected to an oil return pipe 81 communicating with the oil sump 61a provided at the bottom of the low pressure chamber 61,
The oil return pipe 81 is opened in the protrusion of the suction pipe 14, and the oil return passage 81 is formed by the oil return pipe 81.

Thus, during operation of the scroll compressor,
Even if oil leaks from the oil reservoir 61a formed at the bottom of the low pressure chamber 61, the oil return pipe 81
By this, the oil accumulated in the low pressure chamber oil sump 61a can be efficiently recovered to the oil sump 62a in the high pressure chamber 62, and the oil sump 62a on the high pressure chamber 62 side can be operated during operation of the compressor.
Since it is possible to prevent the amount of oil from decreasing, it is possible to solve the problem of insufficient oil supply to each bearing.

Further, in the fourth embodiment, the high-pressure chamber 62 containing the motor M is formed in the upper part of the casing 1, and the low-pressure chamber 61 containing the compression element 2 is formed in the lower part of the casing 1. Since the high pressure chamber oil sump 62a can be formed by utilizing the space formed between the partition wall 12a and the motor M, the axial length of the casing 1 can be shortened by that much, and the compressor as a whole can be miniaturized. is there.

Moreover, since the high pressure chamber 62 is formed on the upper side of the casing 1, the high pressure chamber oil sump 62a can be formed above the compression element 2, that is, above the bearing housing 3. From the oil supply passage 35, the oil in the high pressure chamber oil sump 62a is satisfactorily supplied to each lubrication point in the compression element 2 by its own weight and the pressure difference between the bearing portion 31 and the high pressure chamber 62. It can be done.

Further, in the fourth embodiment, as in the first embodiment, the oil return pipe 81 is opened in the suction pipe 14 where the flow velocity of the suction gas is highest in the low pressure chamber 61. The oil suction force from the oil sump 61a is large, and the oil can be efficiently returned to the high pressure chamber 62.

Next, a fifth embodiment will be described with reference to FIG. The fifth embodiment is similar to the fourth embodiment in that the compression element 2 is arranged in the lower part of the casing 1 and the motor M is arranged in the upper part of the casing 1.
The scroll 21 is a fixed scroll that is fixed to the casing 1, and the second scroll 22 is a movable scroll that is driven in conjunction with the drive shaft 4 of the motor M.
The suction pipe 14 that opens into the low-pressure chamber 61 also penetrates to reach the suction port 27 of the compression element 2 and the suction port 27.
And the oil return passage 8 is constructed as shown below. That is, the end plate 21a of the first scroll 21 is formed with the through hole 21c that opens to the suction port 27 side of the compression element 2, and the oil return pipe 81a that forms the oil return passage 8 is formed in the through hole 21c. Connect one end of
The oil sump 61a provided with the other end at the bottom of the low pressure chamber 61
And the oil return pipe 81a is opened to the suction port 27 side of the compression element 2 so that the oil return pipe 81a
By connecting a to the through hole 21c, the first
It is formed so as to be supported by the scroll 21.

In this case, as in the second embodiment, the oil return pipe 81a can be supported by the first scroll 21, which is a fixed scroll, so that the first or fourth embodiment described above can be used. As described above, the assembling property can be made better than when the oil return pipe 81 is connected to the suction pipe 14.

In each of the above-mentioned embodiments, the partition wall 1
Although 2a is formed by a part of the upper body 12 and a part of the bearing housing 3 in the casing 1, it may be formed by a separate member as a partition wall.

[0049]

As described above, according to the invention of claim 1, the scroll compressor of the present invention has the casing 1
Compression element 2 with first and second scrolls 21,22
And a motor M for driving the compression element 2 in a scroll compressor, a partition wall 12a is provided at an upper and lower intermediate portion of the casing 1, and a low pressure chamber 61 in which a suction pipe 14 is opened and a discharge pipe 15 are provided. A communication passage which is defined as an open high pressure chamber 62, the compression element 2 is installed in the low pressure chamber 61, the motor M is installed in the high pressure chamber 62, and which communicates with the discharge port 23 of the compression element 2. 7 is provided to open the communication passage 7 to the high pressure chamber 62, while the low pressure chamber is provided at the bottom of the low pressure chamber 61 in the middle of the suction gas passage from the suction pipe 14 to the suction port 27 of the compression element 2. Since the oil return passage 8 communicating with the oil sump 61a is opened, even if oil leaking oil may accumulate in the low pressure chamber oil sump 61a, the oil return passage 8 allows the oil sump 61a and the suction gas passage to be connected to each other. Between Since they are communicated with each other, the oil accumulated in the low pressure chamber sump 61a is sucked up into the suction gas passage by the dynamic pressure generated by the flow velocity of the suction gas flowing through the suction gas passage, and the sucked oil is sucked up by the compression element 2. It is possible to suck the gas together with the suction gas into the high pressure chamber 62 from the discharge port 23 through the communication passage 7, and as a result, the oil sump 61a of the low pressure chamber 61 can be discharged.
Since the oil accumulated in the high pressure chamber 62 can be efficiently collected in the oil reservoir in the high pressure chamber 62, the oil amount in the oil reservoir in the high pressure chamber 62 can be prevented from decreasing during operation of the compressor, and The lack of refueling can be solved.

According to the second aspect of the present invention, the low-pressure chamber 61 containing the compression element 2 is provided in the upper part of the casing 1.
Since the high pressure chamber 62 that houses the motor M is provided in the lower portion of the casing 1, the high pressure chamber oil sump can be formed in the lower portion of the high pressure chamber 62 that houses the motor M, that is, on the side opposite to the compression element of the motor M. Moreover, the high pressure chamber 62
A bearing support for supporting the drive shaft 4 is usually provided in the lower part of the space, and a space is provided between the bearing support arranged below the motor M and the bottom of the high pressure chamber 62. Since it is formed, the oil surface of the oil sump provided at the bottom of the high pressure chamber 62 can be separated from the lower part of the motor M, and therefore the oil surface of the high pressure chamber oil sump is disturbed by the rotation of the motor M. It can reduce the strain.

According to the third aspect of the present invention, the first scroll 21 is a fixed scroll fixed to the casing 1, and the second scroll 22 is the motor M.
As a movable scroll that is driven in conjunction with the drive shaft 4 of the above, it has a bearing portion 31 that supports the drive shaft 4, and a bearing housing 3 that supports the second scroll 22 is opened in an oil sump 61a of the low pressure chamber 61. Is provided with the oil return passage 8 and the second scroll 22 is provided with the oil return passage 8
Since the communication hole 22d that is in communication with the compression element 2 and is opened to the suction port 27 side of the compression element 2 is provided, when the compression element 2 is disposed on the upper part of the casing 1, the bearing housing 3 and the second scroll that becomes the movable scroll Since the suction port 27 side of the compression element 2 and the low pressure chamber oil sump 61a can be communicated with each other only by processing the scroll 22, the oil return passage 8 can be formed without providing a separate pipe. It is possible to collect the oil from the low pressure chamber oil sump 61a while reducing the cost of the parts when forming 8.

According to the fourth aspect of the present invention, the low pressure chamber 61 for accommodating the compression element 2 is provided in the lower portion of the casing 1,
Since the high pressure chamber 62 that houses the motor M is provided in the upper portion of the casing 1, the high pressure chamber oil sump can be formed by utilizing the space formed between the partition wall 12a and the motor M. The axial length can be shortened by that much, and the entire compressor can be downsized. Moreover, since the high pressure chamber oil sump is provided above the compression element 2,
It is possible to supply oil to the lubrication points in the compression element 2 by the weight of the oil and differential pressure oil supply, and it is possible to satisfactorily supply oil to the lubrication points.

Further, according to the invention as set forth in claim 5, the suction pipe 14 is made to plunge into the low pressure chamber 61 to communicate with the suction port 27 of the compression element 2, and inside the plunge portion of the suction pipe 14, Since the oil return pipe 81 is opened, the flow velocity of the suction gas flowing through the suction pipe 14 can be utilized to more effectively suck up the oil from the low pressure chamber oil sump 61a, and thus the high pressure chamber 62 The oil can be returned more efficiently.

Further, according to the invention of claim 6, the first scroll 21 is a fixed scroll fixed to the casing 1, and the second scroll 22 is driven in association with the drive shaft 4 of the motor M. As the movable scroll, the first scroll 21 supports the oil return pipe 81a, and the oil return pipe 81a is opened to the suction port 27 side of the compression element 2. Since the oil return pipe 81a may be connected to and supported by the first scroll 21 in advance before being arranged in the casing 1, or the first scroll 21 may be simultaneously connected when assembled in the casing 1, It is possible to satisfactorily assemble the oil return pipe 81 and satisfactorily recover the oil from the oil sump 61a.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the overall structure of a first embodiment of a scroll compressor according to the present invention.

FIG. 2 is a cutaway sectional view of a main part of a first embodiment of a scroll compressor of the present invention.

FIG. 3 is a cutaway sectional view of an essential part of a second embodiment of the scroll compressor according to the present invention.

FIG. 4 is a cutaway sectional view of an essential part of a third embodiment of the scroll compressor of the present invention.

5 is a cross-sectional view taken along line XX in FIG.

FIG. 6 is a vertical sectional view showing the overall structure of a fourth embodiment of the scroll compressor according to the present invention.

FIG. 7 is a cutaway sectional view of a main part of a fourth embodiment of the scroll compressor according to the present invention.

FIG. 8 is a cutaway sectional view of an essential part of a fifth embodiment of the scroll compressor of the present invention.

FIG. 9 is a vertical sectional view showing a conventional scroll compressor.

[Explanation of symbols]

 1 Casing 12a Partition Wall 14 Suction Pipe 15 Discharge Pipe 2 Compression Element 21 First Scroll (Fixed Scroll) 22 Second Scroll (Movable Scroll) 23 Discharge Port 27 Intake Port 3 Bearing Housing 31 Bearing Part 4 Drive Shaft 61 Low Pressure Chamber 61a Low Pressure Chamber oil sump 62 High pressure chamber 7 Communication passage 8 Oil return passage 81, 81a Oil return pipe

Continuation of the front page (51) Int.Cl. ⁵ Identification code Office reference number FI technical display location F04C 29/02 361 A 6907-3H

Claims (6)

[Claims] 1. A scroll in which a casing (1) contains a compression element (2) having first and second scrolls (21) and (22) and a motor (M) for driving the compression element (2). In the compressor, a partition wall (12a) is provided at an upper and lower intermediate portion of the casing (1) so that a low pressure chamber (61) in which a suction pipe (14) opens and a high pressure chamber (62) in which a discharge pipe (15) opens. ), The compression element (2) is installed in the low pressure chamber (61), the motor (M) is installed in the high pressure chamber (62), and the discharge port of the compression element (2) is installed. A communication passage (7) communicating with (23) is provided to open the communication passage (7) to the high pressure chamber (62),
The low pressure chamber (6) is provided in the middle of the suction gas passage from the suction pipe (14) to the suction port (27) of the compression element (2).
A scroll compressor characterized in that an oil return passage (8) communicating with a low pressure chamber oil sump (61a) provided at the bottom of 1) is opened. 2. A low pressure chamber (61) containing a compression element (2).
The scroll compressor according to claim 1, wherein the casing (1) is provided at an upper portion thereof, and the high pressure chamber (62) having the motor (M) therein is provided at a lower portion of the casing (1). 3. A first scroll (21) is a fixed scroll fixed to a casing (1), and a second scroll (22) is movable in association with a drive shaft (4) of a motor (M). Scroll, the drive shaft (4)
The bearing housing (3) for supporting the second scroll (22) is provided with an oil return passage (8) opening to the oil sump (61a) of the low pressure chamber (61). With the second scroll (22)
The scroll compressor according to claim 2, further comprising: a communication hole (22d) communicating with the oil return passage (8) and opening toward a suction port (27) side of the compression element (2). 4. A low pressure chamber (61) containing a compression element (2).
2. The scroll compressor according to claim 1, wherein the casing (1) is provided at a lower portion thereof, and the high-pressure chamber (62) for housing the motor (M) is provided at an upper portion of the casing (1). 5. A suction pipe (14) projects into the low pressure chamber (61) and communicates with the suction port (27) of the compression element (2),
The scroll compressor according to claim 1 or 2, or 4, wherein an oil return pipe (81) is opened in the protrusion of the suction pipe (14). 6. The first scroll (21) is a fixed scroll fixed to the casing (1), and the second scroll (22) is movable in association with the drive shaft (4) of the motor (M). An oil return pipe (81a) is supported by the first scroll (21), and the oil return pipe (81a) is an inlet (2) of the compression element (2).
The scroll compressor according to claim 1 or claim 2 or claim 4, which is open to the 7) side.