JP6664879B2 - Open type compressor - Google Patents

Description

  The present invention relates to an open type compressor applicable to a compressor, a pump, an expander, and the like.

2. Description of the Related Art Conventionally, there has been known an open-type compressor that has one end of a drive shaft rotatably supported via a bearing inside a housing and protrudes to the outside of the housing to be driven with external power (for example, an open-type compressor). And Patent Document 1.).
The open-type compressor disclosed in Patent Literature 1 rotatably supports a crankshaft that drives an orbiting scroll with a main bearing and a sub-bearing. A mechanical seal that prevents leakage of fluid along the crankshaft is disposed outside the main bearing and inside the sub-bearing with respect to the housing.
The open-type compressor disclosed in Patent Literature 1 is provided with a lubricating oil supply passage for supplying high-pressure lubricating oil to a seal chamber provided with a mechanical seal.

JP-A-2000-352377

  When a mechanical seal is disposed inside a sub-bearing as in the open type compressor of Patent Document 1, leakage of fluid is prevented by the mechanical seal. Since the mist-like lubricating oil contained in the fluid to be compressed is not supplied to the sub-bearing, a grease-filled bearing in which grease is pre-filled has been employed in order to enhance the lubricity of the sub-bearing.

  In order to increase the dynamic load rating of the sub-bearing, it is necessary to increase the diameter of the sub-bearing and the like, but with this, lubrication cannot be sufficiently enhanced in a grease-enclosed bearing. In this case, in order to enhance the lubricity of the sub-bearing, it is desirable to arrange the sub-bearing inside the mechanical seal and enhance the lubricity by mist-like lubricating oil contained in the fluid (refrigerant gas) to be compressed.

  However, if the sub-bearing is arranged inside the mechanical seal, the supply of the lubricating oil to the mechanical seal is hindered by the sub-bearing. If the supply of the mist-like lubricating oil to the mechanical seal is insufficient, the mechanical seal is significantly worn, and the sealability cannot be sufficiently secured.

  The present invention has been made in view of such circumstances, and in a configuration in which a bearing portion is disposed closer to a compression mechanism than a seal portion that prevents leakage of fluid, a seal is suppressed by suppressing wear of the seal portion. It is an object of the present invention to provide an open-type compressor capable of ensuring sufficient performance.

In order to solve the above-described problems, an open-type compressor of the present invention employs the following solutions.
An open-type compressor according to a first aspect of the present invention includes a compression mechanism driven by a drive shaft that rotates around an axis, compresses fluid flowing in from a suction port and discharges the fluid from a discharge port, and an outer peripheral surface of the drive shaft. A seal portion for contacting the seal member and preventing leakage of fluid along the drive shaft, a bearing portion disposed closer to the compression mechanism than the seal portion and supporting the drive shaft, and accommodating the compression mechanism. A cylindrical first housing having the suction port and the discharge port formed on an outer peripheral surface thereof; and a first housing mounted so as to close an opening of the first housing. A second housing, which communicates with the suction port and has a first space on the compression mechanism side of the bearing portion and a second space on the seal portion side of the bearing portion. A space communicated, oil supply groove is formed to supply a mist of lubricating oil to the seal portion by directing the mist of lubricating oil into the second space from the first space.

According to the open type compressor of the first aspect of the present invention, the bearing for supporting the drive shaft is disposed closer to the compression mechanism than the seal for preventing leakage of fluid along the drive shaft, and the compression mechanism of the bearing is provided. A first space communicating with the fluid suction port is formed on the side. The first space and the second space on the seal portion side of the bearing portion are in communication with each other by an oil supply groove.
Therefore, the mist-like lubricating oil contained in the fluid flowing from the suction port is guided from the first space to the second space by the oil supply groove and is supplied to the seal portion.
As described above, according to the open-type compressor of the first aspect of the present invention, in a configuration in which the bearing is disposed closer to the compression mechanism than the seal that prevents leakage of the fluid, wear of the seal is suppressed. A sufficient sealing property can be ensured.

In the open type compressor according to the first aspect of the present invention, a third space through which the fluid flows is formed between an outer peripheral surface of the bearing portion and an inner peripheral surface of the oil supply groove, and the second housing is provided. May have a configuration in which a first oil supply hole for communicating the first space and the third space is formed.
By doing so, the lubricating oil present in the first space is guided to the third space via both the first oil hole and the oil groove. Therefore, the mist-like lubricating oil is more reliably guided from the first space to the second space, and the abrasion of the seal portion can be suppressed to improve the sealability.

In the open-type compressor having the above-described configuration, the second housing is formed with a second tubular oil supply hole that allows the suction port to communicate with the first space, and the straight first oil supply hole is provided in the second housing. It may be arranged on an extension of the second oil supply hole.
By doing so, a certain amount of the fluid guided from the second oil supply hole to the first space can be surely guided to the first oil supply hole.

In the open type compressor according to the first aspect of the present invention, the bearing portion is disposed between the inner ring pressed into the drive shaft, the outer ring pressed into the second housing, and the inner ring and the outer ring. The outer ring may include a plurality of rolling elements, and the outer ring may be formed with a communication hole that guides the fluid flowing into the oil supply groove to the plurality of rolling elements.
By doing so, the mist-shaped lubricating oil is reliably supplied to the plurality of rolling elements disposed between the inner ring and the outer ring of the bearing portion, and the lubricity of the bearing portion can be improved.

In the open-type compressor having the above configuration, the rolling element is a shaft-like member extending along the axis.
By doing so, the bearing portion can be configured with a needle bearing using the shaft-like member as the rolling element, and the dynamic load rating of the bearing portion can be increased.

  ADVANTAGE OF THE INVENTION According to this invention, in the structure with which a bearing part is arrange | positioned rather than the seal part which prevents leakage of a fluid, the open type which can suppress abrasion of a seal part and can ensure sufficient sealing performance. A compressor can be provided.

It is a longitudinal section showing an open type compressor of one embodiment of the present invention. FIG. 2 is a perspective view showing a part of the sub-bearing shown in FIG. 1 with a cutout. It is a principal part enlarged view of the open type compressor shown in FIG. FIG. 4 is a sectional view of the open-type compressor shown in FIG. FIG. 4 is a sectional view of the open-type compressor shown in FIG.

Hereinafter, an open type compressor according to an embodiment of the present invention will be described with reference to FIGS. 1 to 5.
As shown in FIG. 1, an open scroll compressor (open compressor) 1 of the present embodiment includes a cylindrical housing 2 (first housing) extending in a circumferential direction around an axis X, and a housing 2. And a front housing 3 (second housing) attached so as to close the opening 2a provided on the front end side of the front housing 3.

The housing 2 has a shape in which the rear end side is closed, and the front housing 3 is fixed to the opening 2a on the front end side by bolts (not shown). A sealed space is formed inside the housing 2 with the front housing 3 fixed thereto, and the scroll compression mechanism 5 and the drive shaft 6 are accommodated in the sealed space.
On the outer peripheral surface of the housing 2, there are formed a suction port 25 for allowing a fluid (refrigerant gas) to flow into the closed space and a discharge port 24 for discharging the fluid compressed by the scroll compression mechanism 5 from the closed space to the outside. .

  The drive shaft 6 is rotatably supported by the front housing 3 via a main bearing 7 and a sub bearing 8 (bearing portion). At the front end of the drive shaft 6 protruding from the front housing 3 to the outside via the lip seal 9, a pulley 11 rotatably mounted via a bearing 10 on the outer periphery of the front housing 3 is provided with an electromagnetic clutch 12. Are connected via As described above, the drive shaft 6 receives the power from the outside that drives the pulley 11 via the electromagnetic clutch 12 and rotates around the axis X shown in FIG.

  At the rear end of the drive shaft 6, a crank pin 13 eccentric by a predetermined dimension is provided integrally. The rear end of the drive shaft 6 is connected to the orbiting scroll 16 of the scroll compression mechanism 5 to be described later via a well-known driven crank mechanism 14 including a drive bush whose turning radius is variable.

The scroll compression mechanism 5 is driven by the drive shaft 6 and compresses a fluid (refrigerant gas) flowing from a suction port 25 formed on the outer peripheral surface of the housing 2 and discharges the compressed fluid from a discharge port 24 formed in the housing 2. Things.
The scroll compression mechanism 5 forms a pair of compression chambers 17 between the pair of fixed scrolls 15 and the orbiting scroll 16 by shifting the phases by 180 degrees to form a pair of compression chambers 17. Fluid (refrigerant gas) is compressed by moving from the position to the center position while gradually reducing the volume.

  The fixed scroll 15 has a discharge port 18 for discharging the compressed fluid at a central portion thereof, and is fixed to a bottom wall surface of the housing 2 via a bolt 19. Further, the orbiting scroll 16 is connected via a driven crank mechanism 14 to a crank pin 13 of the drive shaft 6, and is capable of revolving orbiting on a thrust bearing surface of the front housing 3 via a known rotation preventing mechanism (not shown). Supported.

  An O-ring 21 is provided on the outer periphery of the end plate 15A of the fixed scroll 15. By bringing the O-ring 21 into close contact with the inner peripheral surface of the housing 2, the internal space of the housing 2 is partitioned into a discharge chamber 22 and a suction chamber 23.

The discharge chamber 22 communicates with the discharge port 18 so that fluid (compressed refrigerant gas) from the compression chamber 17 is discharged. The fluid discharged to the discharge port 18 is discharged from the discharge port 24 formed in the housing 2 to the refrigeration cycle side.
The suction chamber 23 communicates with a suction port 25 formed in the housing 2, and a low-pressure fluid circulated through a refrigeration cycle is sucked from the suction port 25, and the fluid is sucked into the compression chamber 17 via the suction chamber 23. It has become so.

  Further, the pair of fixed scrolls 15 and the orbiting scrolls 16 are configured such that spiral wraps 15B, 16B are erected on end plates 15A, 16A, respectively. Between the scrolls 15 and 16, a pair of compression chambers 17 partitioned by end plates 15A and 16A and spiral wraps 15B and 16B are formed symmetrically with respect to the center of the scroll. Further, the orbiting scroll 16 is smoothly orbitally driven to rotate around the fixed scroll 15.

  As shown in FIG. 1, the compression chamber 17 has an axial height higher on the outer peripheral side of the spiral wraps 15B and 16B than on the inner peripheral side. Thereby, when the compression chamber 17 moves from the outer peripheral side to the central side while reducing the volume and compresses the fluid, it is possible to three-dimensionally compress the spiral wraps 15B and 16B in both the circumferential direction and the wrap height direction. A simple scroll compression mechanism 5 is configured.

  The main bearing 7 supports the drive shaft 6 on the axis X. The inner ring is press-fitted into the drive shaft 6 and the outer ring is press-fitted into the end of the front housing 3 on the scroll compression mechanism 5 side. The main bearing 7 is held on the axis X by the front housing 3. The main bearing 7 is a ball bearing that is arranged closer to the scroll compression mechanism 5 than the sub bearing 8 and has a larger outer diameter than the sub bearing 8.

  The sub bearing 8 supports the drive shaft 6 on the axis X together with the main bearing 7. The inner ring 8 a is pressed into the drive shaft 6 and the outer ring 8 b is pressed into the front housing 3. The sub bearing 8 is held on the axis X by the front housing 3. The sub bearing 8 is a needle bearing that is disposed closer to the scroll compression mechanism 5 than the lip seal 9 and has a smaller outer diameter than the main bearing 7.

As shown in the perspective view of FIG. 2, the vehicle includes an outer ring 8b, a plurality of rollers 8c (rolling elements) disposed between the inner ring 8a and the outer ring 8b, and a retainer 8d for holding the plurality of rollers 8c. The plurality of rollers 9c are shaft members extending along the axis X.
In FIG. 2, the illustration of the inner ring 8a is omitted.

  The lip seal 9 (seal portion) is a member that contacts the outer peripheral surface of the drive shaft 6 and prevents leakage of fluid along the drive shaft 6. The lip seal 9 is attached to the inner peripheral surface of the front housing 3 and is held on the axis X.

Next, a mechanism for supplying mist-like lubricating oil contained in the fluid sucked from the suction port 25 to the sub bearing 8 and the lip seal 9 will be described.
As shown in FIG. 1, the front housing 3 has an oil supply groove 3a, an oil supply hole 3b (first oil supply hole), and an oil supply hole 3c (second oil supply hole). The mist-like lubricating oil contained in the fluid flowing from the suction port 25 is conducted to the first space S1 of the sub bearing 8 on the scroll compression mechanism 5 side by the oil supply hole 3c that connects the suction port 25 and the first space S1. I will

The mist-like lubricating oil contained in the fluid guided to the first space S1 is supplied to the main bearing 7, and the lubricity of the main bearing 7 is enhanced. Similarly, the mist-like lubricating oil is supplied to the sub-bearing 8, and the lubricity of the sub-bearing 8 is enhanced.
The longitudinal cross-sectional view of FIG. 1 shows oil supply holes 3c provided at two upper and lower positions of the front housing 3. The oil supply holes 3c are provided at a plurality of positions (for example, four positions) in the circumferential direction around the axis X. Have been.

As shown in the enlarged view of the main part of FIG. 3, the mist-like lubricating oil guided to the first space S1 is lip-connected to the sub-bearing 8 by an oil supply groove 3a for communicating the first space S1 and the second space S2. It is led to the second space S2 on the seal 9 side.
As shown in FIGS. 3 and 4 (a sectional view taken along the line AA in FIG. 3), the oil supply groove 3a extends along the axis X and has a substantially semicircular cross section.

As shown in FIG. 4, the lubrication grooves 3a are provided at four locations at 90-degree intervals in the circumferential direction around the axis X. The lubrication groove 3a is not limited to four locations, but may be provided at any location (for example, eight locations at 45 degree intervals).
The oil supply groove 3a may be provided in advance when the front housing 3 is manufactured by casting. The oil supply groove 3a may be formed by processing the front housing 3 after manufacturing it by casting.

As shown in FIG. 3, between the outer peripheral surface of the outer ring 8b of the sub bearing 8 and the inner peripheral surface of the oil supply groove 3a, a third space S3 for flowing a fluid from the first space S1 to the second space S2 is formed. Have been.
Further, as shown in FIG. 3, a fuel supply hole 3b formed in the front housing 3 is formed so as to communicate the first space S1 and the third space S3. As shown in FIG. 3, the oil supply hole 3b is formed so as to discharge mist-like lubricating oil at an intermediate position in the direction of the axis X of the third space S3.
As shown by arrows in FIG. 4, the oil supply holes 3b guide the fluid flowing from the first space S1 to the corresponding oil supply grooves 3a.

  As shown in FIG. 1, each of the oil supply hole 3b and the oil supply hole 3c is formed in a straight tubular shape, and the oil supply hole 3b is arranged on an extension of the oil supply hole 3c. Therefore, the fluid guided from the suction port 25 to the refueling hole 3c is easily guided to the refueling hole 3b via the first space S1. By doing so, a certain amount of the fluid guided from the refueling hole 3c to the first space S1 can be reliably guided to the refueling hole 3b.

  Further, as shown in FIG. 1, the diameter of the oil supply hole 3b (flow path cross-sectional area) is smaller than the diameter of the oil supply hole 3c (flow path cross-sectional area). Therefore, it is possible to prevent the entire amount of the fluid guided from the refueling hole 3c to the first space S1 from being guided to the refueling hole 3b, and to reliably set a certain amount of the fluid guided from the refueling hole 3c to the first space S1 to the main bearing. 7 can be led.

  As shown in FIG. 3, the outer ring 8b of the sub bearing 8 is provided with a communication hole 8e for guiding the fluid flowing into the oil supply groove 3a to the plurality of rollers 8c. Mist-like lubricating oil contained in the fluid flowing into the oil supply groove 3a via the communication hole 8e is supplied to the plurality of rollers 8c. Therefore, the lubricity of the sub bearing 8 is improved, and the flaking phenomenon (peeling phenomenon) of the sub bearing 8 is suppressed.

As shown in FIG. 3, the position in the axis X direction of the communication hole 8e formed in the outer ring 8b of the sub bearing 8 coincides with the position in the axis X direction where the oil supply hole 3b is connected to the oil supply groove 3a. The fluid flowing from the oil supply hole 3b into the oil supply groove 3a has a velocity component in the direction of flowing into the communication hole 8e, so that the fluid easily flows into the communication hole 8e.
As shown in FIG. 5, the communication holes 8e are formed at four positions on the outer ring 8b of the sub bearing 8 so as to correspond to the four oil supply grooves 3a, respectively.

The operation and effects of the open-type compressor 1 of the present embodiment described above will be described.
According to the open-type compressor 1 of the present embodiment, the sub bearing 8 that supports the drive shaft 6 is disposed closer to the scroll compression mechanism 5 than the lip seal 9 that prevents leakage of fluid along the drive shaft 6, A first space S <b> 1 communicating with the fluid inlet 25 is formed on the scroll compression mechanism 5 side of the bearing 8. The first space S1 and the second space S2 on the side of the lip seal 9 of the sub bearing 8 are in communication with each other by an oil supply groove 3a.

Therefore, the mist-like lubricating oil contained in the fluid flowing from the suction port 25 is guided from the first space S1 to the second space S2 by the oil supply groove 3a, and is supplied to the lip seal 9.
As described above, according to the open type compressor 1 of the present embodiment, in the configuration in which the sub bearing 8 is disposed closer to the scroll compression mechanism 5 than the lip seal 9 for preventing leakage of fluid, wear of the lip seal 9 is reduced. It is possible to suppress and suppress the sealing property sufficiently.

Further, in the open type compressor 1 of the present embodiment, a third space S3 through which fluid flows is formed between the outer peripheral surface of the sub bearing 8 and the inner peripheral surface of the oil supply groove 3a. , An oil supply hole 3b for communicating the first space S1 with the third space S3.
By doing so, the lubricating oil existing in the first space S1 is guided to the third space S3 via both the oil supply hole 3b and the oil supply groove 3a. Therefore, the mist-like lubricating oil is more reliably guided from the first space S1 to the second space S2, and the abrasion of the lip seal 9 can be suppressed to improve the sealing performance.

Further, in the open-type compressor 1 of the present embodiment, the front housing 3 is formed with a straight tubular oil supply hole 3c that allows the suction port 25 to communicate with the first space S1. , Are arranged on an extension of the oil supply hole 3c.
By doing so, a certain amount of the fluid guided from the oil supply hole 3c to the first space S1 can be surely guided to the oil supply hole 3b.

In the open-type compressor 1 of the present embodiment, the sub bearing 8 includes an inner ring 8a press-fit into the drive shaft 6, an outer ring 8b press-fit into the front housing 3, and a plurality of sub-bearings 8 arranged between the inner ring 8a and the outer ring 8b. Roller 8c. The outer ring 8b has a communication hole 8e that guides the fluid flowing into the oil supply groove 3a to the plurality of rollers 8c.
By doing so, the mist-like lubricating oil is reliably supplied to the plurality of rollers 8c disposed between the inner ring 8a and the outer ring 8b of the sub bearing 8, and the lubricity of the sub bearing 8 is improved. be able to.

  Further, in the open type compressor 1 of the present embodiment, the sub bearing 8 is a needle bearing using a shaft-like member as a rolling element. Therefore, the dynamic rated load for supporting the drive shaft can be increased as compared with the case where a ball bearing is used for the sub bearing 8.

  Note that the present invention is not limited to the invention according to the above-described embodiment, and can be appropriately modified without departing from the gist of the invention.

1 open type compressor 2 housing (first housing)
2a opening 3 front housing (second housing)
3a Oil groove 3b Oil hole (first oil hole)
3c Oil hole (second oil hole)
5 Scroll compression mechanism 6 Drive shaft 7 Main bearing 8 Sub bearing (bearing part)
8a Inner ring 8b Outer ring 8c Roller (rolling element; shaft member)
8d Cage 8e Communication hole 9 Lip seal (seal part)
Reference Signs List 10 bearing 11 pulley 12 electromagnetic clutch 13 crank pin 14 driven crank mechanism 15 fixed scroll 15A end plate 16 orbiting scroll 16A end plate 17 compression chamber 18 discharge port 21 O-ring 22 discharge chamber 23 suction chamber 24 discharge port 25 suction port X axis

Claims (5)

A compression mechanism that is driven by a drive shaft that rotates around an axis and that compresses fluid flowing in from an inlet and discharges the fluid from an outlet;
A seal portion that contacts the outer peripheral surface of the drive shaft and prevents leakage of fluid along the drive shaft;
A bearing portion that is disposed closer to the compression mechanism than the seal portion and supports the drive shaft;
A first cylindrical housing housing the compression mechanism and having the suction port and the discharge port formed on an outer peripheral surface thereof;
A second housing attached to close the opening of the first housing and holding the bearing portion and the seal portion on the axis;
The second housing communicates with the suction port and communicates a first space of the bearing portion on the compression mechanism side with a second space of the bearing portion on the seal portion side. By introducing the mist-like lubricating oil to the second space, an oil supply groove for supplying the mist-like lubricating oil to the seal portion is formed ,
A third space through which the fluid flows is formed between an outer peripheral surface of the bearing portion and an inner peripheral surface of the oil supply groove,
An open-type compressor in which a first oil supply hole for communicating the first space and the third space is formed in the second housing . A compression mechanism that is driven by a drive shaft that rotates around an axis and that compresses fluid flowing in from an inlet and discharges the fluid from an outlet;
A seal portion that contacts the outer peripheral surface of the drive shaft and prevents leakage of fluid along the drive shaft;
A bearing portion that is disposed closer to the compression mechanism than the seal portion and supports the drive shaft;
A first cylindrical housing housing the compression mechanism and having the suction port and the discharge port formed on an outer peripheral surface thereof;
A second housing attached to close the opening of the first housing and holding the bearing portion and the seal portion on the axis;
The second housing is formed with an oil supply groove communicating with the suction port and communicating a first space of the bearing portion on the compression mechanism side with a second space of the bearing portion on the seal portion side,
A third space through which the fluid flows is formed between an outer peripheral surface of the bearing portion and an inner peripheral surface of the oil supply groove,
An open-type compressor in which a first oil supply hole for communicating the first space and the third space is formed in the second housing. The second housing has a straight tubular second oil supply hole for communicating the suction port with the first space,
The first oil supply hole straight tubular open-type compressor according to claim 1 or 2 is disposed on an extension line of the second oil supply hole. The bearing portion includes an inner ring press-fitted into the drive shaft, an outer ring press-fitted into the second housing, and a plurality of rolling elements disposed between the inner ring and the outer ring.
4. The open-type compressor according to claim 1, wherein a communication hole that guides fluid flowing into the oil supply groove to the plurality of rolling elements is formed in the outer ring. 5.   The open-type compressor according to claim 4, wherein the rolling element is a shaft-like member extending along the axis.

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