JP6974095B2 - Open compressor - Google Patents

Description

The present invention relates to an open compressor.

As a kind of compressor, a device called an open compressor is known. In an open compressor, one end of a drive shaft rotatably supported inside the housing is projected to the outside of the housing, and a driving force from the outside is applied to this one end. Therefore, a differential pressure is generated inside and outside the housing along the drive shaft. A seal portion is provided on the outer peripheral surface of the drive shaft for the purpose of leaking the fluid based on this differential pressure (see, for example, Patent Document 1 below). In the open compressor described in Patent Document 1, a lip seal is adopted as a sealing portion. Further, the lip seal is supplied with mist-like lubricating oil contained in the fluid flowing in the housing through the lubrication hole and the lubrication groove. This reduces wear on the lip seal.

The above lip seal generally has a double structure. Specifically, the lip seal has a rubber first lip and a resin second lip.

Japanese Unexamined Patent Publication No. 2016-156310

However, in the apparatus according to Patent Document 1, the lubricating oil supply hole is only provided on the first lip side. Therefore, the lubricating oil does not sufficiently spread on the second lip side, and the second lip is worn due to poor lubrication. In particular, when the pressure inside the compressor becomes negative depending on the operating conditions, or when the suction pressure is low and the circulation amount of the lubricating oil is small, the lubrication to the second lip is hindered and the possibility of poor lubrication increases. In addition, in the apparatus according to Patent Document 1, since the lubricating oil contained in the fluid flowing in the housing (lubricating oil flowing in the refrigeration cycle) is used for lubrication, the structure may be complicated. be.

The present invention has been made to solve the above problems, and an object of the present invention is to provide an open compressor having a simpler configuration and capable of stable operation.

According to the first aspect of the present invention, the open compressor has a drive shaft rotatably supported around the axis by a bearing, and is driven by the rotation of the drive shaft to compress the fluid. The compressor main body, the seal portion that seals the leakage of the fluid from the compressor main body by contacting the outer peripheral surface of the drive shaft, and the front housing that covers the compressor main body and the seal portion. A pulley rotatably installed on the outer peripheral portion of the front housing via a bearing is connected to one end of the drive shaft via an electromagnetic clutch, and the seal portion is connected to the compressor in the axial direction. Lubricating oil is stored under atmospheric pressure with a first lip portion provided on the main body side, a second lip portion provided on the side opposite to the compressor main body with the first lip portion sandwiched in the axial direction. and oil pots is connected to the oil pot, and a supply unit for supplying a lubricating oil to the opposite side of the compressor body of the first lip portion in the axial direction, the oil pot, the front It is buried inside a portion of the housing adjacent to the pulley in the axial direction .

According to this configuration, the lubricating oil supplied from the oil pot to the supply section can be supplied to the second lip section. This makes it possible to reduce the possibility of wear of the second lip portion. In addition, the lubricating oil can be supplied to the region without using a device other than the oil pot and the supply unit. This makes it possible to simplify the configuration of the device.
Further, since the oil pot is provided inside the front housing, the space around the front housing can be saved.

According to the third aspect of the present invention, the supply unit may supply the lubricating oil by dripping based on gravity.

According to this configuration, the lubricating oil can be supplied without using a pump or the like. This makes it possible to simplify the configuration of the device.

According to the present invention, it is possible to provide an open compressor having a simpler configuration and capable of stable operation.

It is sectional drawing which shows the structure of the open type compressor which concerns on embodiment of this invention. It is an enlarged view of the main part of the open type compressor which concerns on embodiment of this invention.

An embodiment of the present invention will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the open scroll compressor (open compressor) 1 according to the present embodiment includes a housing 2, a front housing 3, a compressor main body 1A, a seal portion 9, and a lubricating oil supply portion 10. And have.

The housing 2 has a cylindrical shape extending in the X direction of the axis. A front housing 3 is attached to the opening 2a formed on one side of the housing 2 so as to close the opening 2a. By attaching the front housing 3 to the housing 2, a closed space is formed inside. The compressor body 1A is housed in this closed space. On the outer peripheral surface of the housing 2, a suction port 25 for flowing a fluid (refrigerant gas) into the closed space and a discharge port 24 for discharging the fluid compressed by the compressor body 1A from the closed space to the outside are formed. ..

The compressor body 1A has a columnar drive shaft 6 extending along the axis X and a scroll compression unit 5 connected to the drive shaft 6. The drive shaft 6 is rotatably supported by the front housing 3 via a main bearing 7 and a sub bearing 8. One end of the drive shaft 6 projects outward from the front housing 3 via the seal portion 9. A pulley 11 rotatably installed on the outer peripheral portion of the front housing 3 via a bearing 20 is connected to one end of the drive shaft 6 via an electromagnetic clutch 12. Power from the outside that drives the pulley 11 is transmitted to the drive shaft 6 via the electromagnetic clutch 12, and the drive shaft 6 rotates around the axis X.

More specifically, as shown in FIG. 2, the electromagnetic clutch 12 includes an electromagnet M that generates a magnetic force between an amateur plate 12A integrally provided on the drive shaft 6 and an amateur plate 12A by being excited. have. The amateur plate 12A has a cylindrical boss portion 12B and an amateur plate main body 12C projecting from the boss portion 12B to the outside in the radial direction of the axis X.

When the electromagnet M is excited by an external power supply, it attracts the amateur plate 12A to the electromagnet M side. As a result, the pulley 11 and the amateur plate 12A come into contact with each other, and the rotational force of the pulley 11 is transmitted to the amateur plate 12A. That is, the amateur plate 12A is integrated with the pulley 11 and rotates around the axis X.

On the other hand, when the electromagnet M is not energized, the rotational force of the pulley 11 is not transmitted to the amateur plate 12A. That is, the pulley 11 is in an idling state. By such an operation, the operation of the amateur plate 12A and the drive shaft 6 is controlled.

A crank pin 13 eccentric in the radial direction of the axis X is integrally provided at the other end of the drive shaft 6. A swivel scroll 16 of a scroll compression unit 5, which will be described later, is connected to the other end of the drive shaft 6 via a crank pin 13.

The scroll compression unit 5 is driven by the drive shaft 6 to compress the fluid flowing in from the suction port 25 and discharge it from the discharge port 24. The scroll compression unit 5 meshes the fixed scroll 15 and the swivel scroll 16 with a phase shift of 180 °, so that a compression chamber 17 is formed between the fixed scroll 15 and the swivel scroll 16.

The fixed scroll 15 and the swivel scroll 16 have end plates 15A and 16A, and spiral wraps 15B and 16B provided on the end plates 15A and 16A, respectively. A discharge port 18 for discharging the compressed fluid is formed in the center of the fixed scroll 15. The fixed scroll 15 is fixed to the bottom surface of the housing 2 via bolts 19. The swivel scroll 16 is connected via a driven crank mechanism 14 of the crankpin 13 of the drive shaft 6 and is supported so as to be able to revolve and swivel with respect to the fixed scroll 15.

An O-ring 21 is attached to the outer peripheral portion of the end plate 15A of the fixed scroll 15. Since the O-ring 21 is in close contact with the inner peripheral surface of the housing 2, the internal space of the housing 2 is divided into a discharge chamber 22 and a suction chamber 23. The discharge chamber 22 communicates with the discharge port 18. The fluid (compressed refrigerant gas) supplied from the compression chamber 17 flows into the discharge chamber 22. The suction chamber 23 communicates with the suction port 25 formed in the housing 2. The low-pressure fluid taken in through the suction port 25 is sucked into the compression chamber 17 via the suction chamber 23.

The main bearing 7 supports the drive shaft 6 on the axis X. The main bearing 7 is arranged closer to the scroll compression portion 5 than the sub bearing 8 described later. The main bearing 7 is a ball bearing having an outer diameter larger than that of the sub bearing 8.

The sub-bearing 8 is arranged on the scroll compression portion 5 side of the seal portion 9. The sub bearing 8 is a needle bearing having an outer diameter smaller than that of the main bearing 7.

The seal portion 9 contacts the outer peripheral surface of the drive shaft 6 to seal the leakage of fluid from the compressor main body 1A. The seal portion 9 is attached to the inner peripheral surface of the front housing 3. More specifically, as shown in FIG. 2, the seal portion 9 is adjacent to the first lip portion 9A provided on the compressor main body 1A side relatively in the axis X direction and the first lip portion 9A in the axis X direction. It has a second lip portion 9B and the like.

The second lip portion 9B is provided on the side opposite to the compressor main body 1A with the first lip portion 9A interposed therebetween in the axis X direction. The first lip portion is made of rubber such as butadiene. As the material of the second lip portion, for example, PTFE (polytetrafluoroethylene) is used.

The first lip portion 9A forms an annular shape having a cross section extending diagonally from the radial outside to the inside of the axis X from one side to the other in the axis X direction. The other end of the first lip portion 9A is in contact with the outer peripheral surface of the drive shaft 6. The second lip portion 9B also forms an annular shape having a cross section extending diagonally from the radial outside to the inside of the axis X from one side to the other in the axis X direction. The other end of the second lip portion 9B is in contact with the outer peripheral surface of the drive shaft 6.

An oil seal 9C is provided on the opposite side of the second lip portion 9B from the first lip portion 9A. The oil seal 9C is provided to prevent the lubricating oil, which will be described later, from leaking to the outside along the drive shaft 6.

The lubricating oil supply unit 10 has an oil pot 10A for storing lubricating oil and a supply unit main body 10B (supply unit) connected to the oil pot 10A. The oil pot 10A is embedded in the wall surface of the front housing 3 described above. More specifically, the oil pot 10A is provided inside a portion of the front housing 3 adjacent to the pulley 11 in the X direction of the axis. As will be described in detail later, the lubricating oil in the oil pot 10A is dropped downward based on gravity. Therefore, when installing the open compressor 1, the oil pot 10A is located above the drive shaft 6 with the open compressor 1 arranged so that the axis X is along the horizontal direction. , It is necessary to manage that attitude.

The supply section main body 10B is a flow path for supplying the lubricating oil of the oil pot 10A in the vicinity of the second lip section 9B. One end of the supply unit main body 10B is a proximal end side flow path 10B1 connected to the oil pot 10A and extending in the radial direction intersecting the axis X. Further, the other end of the supply unit main body 10B is an end side flow path 10B2 that communicates with the base end side flow path 10B1 and extends in the axis X direction. The end-side flow path 10B2 is open to the outside from the end surface of the front housing 3 facing the axis X direction. The opening may be closed with a lid (not shown) or the like. Negative pressure or positive pressure based on the operation of the compressor main body 1A is not applied to the oil pot 10A.
Further, a supply flow path 10B3 extending toward the second lip portion 9B is provided in the vicinity of the second lip portion 9B so as to branch from the terminal side flow path 10B2. The supply flow path 10B3 is open on the side opposite to the compressor main body 1A of the second lip portion 9B in the axis X direction.
The supply unit main body 10B may be a pipe or a flow path directly formed in the wall surface of the front housing 3.

The lubricating oil stored in the oil pot 10A flows downward based on the gravity acting on itself, and then is guided to the vicinity of the second lip portion 9B through the supply section main body 10B. As a result, lubricating oil is supplied between the second lip portion 9B and the outer peripheral surface of the drive shaft 6.

As described above, according to the above configuration, the lubricating oil supplied from the oil pot 10A to the supply unit main body 10B is referred to as the compressor main body 1A of the second lip portion 9B in the axis X direction through the supply flow path 10B3. It can be supplied to the opposite area. As a result, the possibility that the second lip portion 9B is worn can be reduced. In addition, the lubricating oil can be supplied to the region without using any device other than the oil pot 10A and the supply unit main body 10B. This makes it possible to simplify the configuration of the device.

Further, according to the above configuration, since the oil pot 10A is provided inside the front housing 3, the space around the front housing 3 can be saved.

In addition, according to the above configuration, since the supply unit main body 10B supplies the lubricating oil by dripping based on gravity, the lubricating oil can be supplied without using another pressure device such as a pump. .. This makes it possible to simplify the configuration of the device.

The embodiment of the present invention has been described above. The above configuration is an example, and various changes and modifications can be made to the above configuration as long as the gist of the present invention is not deviated. For example, in the above embodiment, the configuration in which the oil pot 10A is provided inside the front housing 3 has been described as an example. However, the aspect of the oil pot 10A is not limited to the above, and it is also possible to adopt a configuration in which the oil pot 10A is provided on the outside of the front housing 3.

Further, the position where the lubricating oil is supplied is closer to the atmosphere than the first lip portion 9A, that is, the position where the lubricating oil is supplied is on the side opposite to the compressor body 1A in the axis X direction with respect to the first lip portion 9A. It may be a region, and may be a region between the first lip portion 9A and the second lip portion 9B.

Further, for example, the supply unit main body 10B may be filled with the lubricating oil and gradually supplied to the second lip unit by gravity.

1 Open type compressor 1A Compressor body 2 Housing 2a Opening 3 Front housing 5 Scroll compression part 6 Drive shaft 7 Main bearing 8 Sub bearing 9 Seal part 9A First lip part 9B Second lip part 9B1 Outer second lip part 10 Lubricating oil supply unit 10A Oil pot 10B Supply unit main body (supply unit)
10B1 Base end side flow path 10B2 Termination side flow path 10B3 Supply flow path 11 Pulley 12 Electromagnetic clutch 12A Amateur plate 12B Boss part 12C Amateur plate body 13 Crankpin 14 Driven crank mechanism 15 Fixed scroll 15A End plate 16 Swivel scroll 16A End plate 17 Compression chamber 18 Discharge port 20 Bearing 21 O-ring 22 Discharge chamber 23 Suction chamber 24 Discharge port 25 Suction port X axis

Claims (2)

A compressor body that has a drive shaft that is rotatably supported around an axis by bearings and that compresses fluid by being driven along with the rotation of the drive shaft.
A sealing portion that seals the leakage of the fluid from the compressor body by contacting the outer peripheral surface of the drive shaft, and a sealing portion.
A front housing that covers the compressor body and the seal portion is provided.
A pulley rotatably installed on the outer peripheral portion of the front housing via a bearing is connected to one end of the drive shaft via an electromagnetic clutch.
The seal portion is
The first lip portion provided on the compressor main body side in the axial direction, and
A second lip portion provided on the side opposite to the compressor main body with the first lip portion sandwiched in the axial direction, and a second lip portion.
An oil pot that stores lubricating oil under atmospheric pressure,
A supply unit connected to the oil pot and supplying lubricating oil to the side of the first lip portion in the axial direction opposite to the compressor main body.
Equipped with
The oil pot is an open compressor embedded in a portion of the front housing adjacent to the pulley in the axial direction. The open compressor according to claim 1 , wherein the supply unit supplies the lubricating oil by dripping based on gravity.

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