JP2003129973A - Scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the leakage of a refrigerant gas due to the wear of a sealing member by increasing the lubricating performance of the sealing member for sealing between a crankshaft and a housing. SOLUTION: This scroll compressor comprises the housing 2, a fixed scroll 32 and a turning scroll 41 provided in the housing 2 for meshing each other in engagement, and the crankshaft 24 rotatably provided in the housing 2 via bearings 16, 20 with a lip seal 29 as the sealing member sealing a space to the housing 2 and connected to the turning scroll 41. A portion of the housing 2 corresponding to the bearing 16 is provided with an oil passage for guiding to the lip seal 29 an oil content contained in the refrigerant gas to be guided into the housing 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type compressor, and more particularly to a scroll type compressor having improved seal portion lubrication performance.

[0002]

2. Description of the Related Art An example of this type of scroll compressor is shown in FIG. This scroll type compressor 51 is
The housing 52, a fixed scroll 55 provided in the housing 52, an orbiting scroll 56 provided in the housing 52 so as to be able to orbit and meshingly engaged with the fixed scroll 55, and the bearing 5 in the housing 52.
A crankshaft 59 is provided that is rotatably provided via 7, 58 and is connected to the orbiting scroll 56, and a lip seal 60 that is a seal member that seals between the crankshaft 59 and the housing 52.

When the crankshaft 59 rotates, the orbiting scroll 56 follows the rotation and makes an orbital orbiting motion with respect to the fixed scroll 55.
The low-pressure refrigerant gas has a suction port (not shown) of the housing 52.
Is sucked into the housing 52.

Here, part of the refrigerant gas is the housing 5
2 is guided to the lip seal 60 side through the gap between the components of the bearing 57, and the mist-like oil component contained in the refrigerant gas is supplied to the lip portion of the lip seal 60, and the lip portion and the crankshaft. It will be lubricated between 59.

Most of the other refrigerant gas sucked into the housing 52 is introduced between the fixed scroll 55 and the orbiting scroll 56 and is compressed into a high temperature / high pressure refrigerant gas, which is discharged through an outlet (not shown). Housing) to housing 52
It will be discharged outside.

[0006]

However, in the scroll compressor 51 having the above-mentioned structure, the oil component contained in the refrigerant is transferred to the lip seal 60 side through the gap between the components of the bearing 57. Since the oil has been supplied, the rotation of the bearing 57 may hinder the oil from flowing and the oil cannot be supplied to the lip seal 60 side. The lip of the lip seal 60 may be worn due to poor lubrication, resulting in poor sealing performance. As a result, the refrigerant gas in the housing 52 leaks to the outside through the lip seal 60, and the compression capacity is significantly reduced.

The present invention has been made in view of the above conventional problems, and it is possible to reliably supply the oil contained in the refrigerant gas to the lip seal, whereby the lip portion of the lip seal is It is an object of the present invention to provide a scroll compressor that prevents wear due to poor lubrication, maintains a good sealing property, and obtains constant compression performance for a long period of time.

[0008]

The present invention employs the following means in order to solve the above problems. That is, the invention according to claim 1 includes a housing,
A fixed scroll and an orbiting scroll, which are provided in the housing and engage with each other, are rotatably provided in the housing via bearings, and are sealed from the housing by a seal member, and A crankshaft connected to the orbiting scroll is provided, and by rotating the crankshaft to orbit the orbiting scroll, a refrigerant gas is sucked into the housing, and an oil component contained in the refrigerant gas is included in the bearing. In the scroll compressor that is supplied to the seal member via the oil passage, an oil passage for guiding the oil component contained in the refrigerant gas introduced into the housing to the seal member is formed in the portion of the housing corresponding to the bearing. It is characterized by having done. According to the scroll compressor according to the present invention,
A part of the refrigerant gas sucked into the housing through the suction port is guided to the seal member through the oil passage, and the atomized oil contained in the refrigerant gas lubricates the seal member.

The invention according to claim 2 is the scroll compressor according to claim 1, wherein the oil passage of the housing is formed by casting. According to the scroll compressor of the present invention, the oil passage of the housing can be easily processed.

A third aspect of the present invention is the scroll compressor according to the first or second aspect, wherein the oil passage extends in the direction of rotation of the crankshaft from the refrigerant gas suction port toward the seal member. It is characterized by being inclined. According to the scroll compressor of the present invention, the refrigerant gas sucked into the housing through the suction port is surely guided into the oil passage,
It will be supplied to the seal member.

A fourth aspect of the present invention is the scroll compressor according to the first, second or third aspect, wherein the oil passage is a main oil groove provided in a portion of the housing with respect to the bearing and oriented in an axial direction. And an auxiliary oil groove provided in a portion continuous with the portion where the main oil groove is provided and oriented in a direction orthogonal to the axis. According to the scroll compressor of the present invention, the refrigerant gas sucked into the housing through the suction port is reliably guided into the oil passage and supplied to the seal member through the main oil groove and the sub oil groove. Become.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention shown in the drawings will be described below. 1 to 3 show an embodiment of a scroll compressor according to the present invention. The scroll compressor 1 is a horizontal scroll compressor and includes a housing 2 and Fixed scroll 32
And the orbiting scroll 41 and the crankshaft 24.

The housing 2 comprises a cup-shaped housing body 3 and a lid member 4 for closing an opening of the housing body 3.
And a fixed scroll 32 and an orbiting scroll 41 are provided in the inner space of the housing body 3.
A crankshaft 24 is rotatably inserted in the center of the lid member 4. The housing body 3 is provided with a suction port (not shown) for guiding the refrigerant gas into the inner space and a discharge port (not shown) for discharging the refrigerant gas from the inner space.

The lid member 4 has a substantially cylindrical main body 5, a substantially cylindrical boss 8 having a diameter smaller than that of the main body 5, which is integrally provided at one axial end of the main body 5, and the main body 5 and the boss. 8 and a flange-shaped flange portion 11 that is integrally provided between the flange portion 11 and the housing body 3, and the body portion 5 is fitted to the inner peripheral side of the opening end portion of the housing body 3. It is attached to the housing body 3 side by fastening the end face with a bolt.

The inner peripheral side of the main body portion 5 of the lid member 4 has a large diameter portion 6
And a small diameter portion 7 having a smaller diameter than that, and is formed in two steps, and the boss 8
The inner peripheral side is formed in two steps of a small diameter portion 10 and a large diameter portion 9 having a diameter larger than that, and a boundary portion 12 between the small diameter portion 7 of the main body portion 5 and the small diameter portion 10 of the boss 8 is an axis line. It is formed on an annular flat surface that intersects at right angles.

An inner bearing 16 is attached to the large-diameter portion 6 of the main body portion 5. The inner bearing 16 has a large diameter portion 6
An outer ring fitted to the outer ring, an inner ring located inside the outer ring, and a ball held between the outer ring and the inner ring. A crank arm 26 of a crank shaft 24 described later is fitted inside the inner ring. It is like this.

An outer bearing 20 is mounted on the large diameter portion 9 of the boss 8. The outer bearing 20 includes an outer ring fitted to the large diameter portion 9, an inner ring located inside the outer ring, and a ball held between the outer ring and the inner ring. The main shaft 25 is fitted.

As shown in FIG. 2, one end of the inner surface of the large-diameter portion 6 of the main body 5 communicates with the inner space of the housing main body 3 and the other end of the boundary 12 between the main body 5 and the boss 8. A plurality of main oil grooves 14 communicating with each other are provided at predetermined intervals in the circumferential direction.

The cross-sectional shape of the main oil groove 14 can be a semicircular shape, an elliptical shape, a triangular shape, a quadrangular shape, etc. (in this embodiment, it is a semicircular shape), but other shapes are possible. Also good.

The main oil groove 14 is formed by casting. Therefore, the main oil groove 14 is formed as a straight groove to enable casting. When the suction port of the housing body 3 is located in the tangential direction, the main oil groove 14 may be inclined at a predetermined angle with respect to the axis of the body portion 5, as shown in FIG. In FIG. 4, arrow A indicates the direction of rotation of the crankshaft, and arrow B indicates the direction in which the refrigerant gas flows.

The main oil groove 14 may be provided in at least one place, and may be provided at unequal intervals.

As shown in FIG. 3, at the boundary 12 between the main body 5 and the boss 8, one end communicates with the main oil groove 14, and the other end communicates with the inner peripheral surface of the small diameter portion 10 of the boss 8. A plurality of oil grooves 15 are provided spirally around the center of the boss 8. Each sub oil groove 15 is formed such that the opening at one end faces the tangential direction. In FIG. 3, arrow A indicates the rotation direction of the crankshaft, and arrow B indicates the direction in which the refrigerant gas flows. The sub oil groove 15 is not limited to a spiral shape, but may be a radial shape or the like. The sub oil groove 15 may be provided at at least one place.

Like the main oil groove 14, the sub oil groove 15 has a semicircular shape, an elliptical shape, a triangular shape, a quadrangular shape or the like (in this embodiment, a semicircular shape). However, other shapes may be used.

The crankshaft 24 is a rod-shaped main shaft 25.
And a disk-shaped crank arm 26 integrally provided at one end of the main shaft 25 with the axes aligned, and a rod-shaped integrally provided on one side surface of the crank arm 26 with the axis of the main shaft 25 and the axis eccentric to each other. And crank pin 27 of.

The main shaft 25 of the crankshaft 24 is rotatably supported by the outer bearing 20 mounted on the large diameter portion 9 of the boss 8, and the crank arm 26 is the inner side mounted on the large diameter portion 6 of the main body portion 5. It is rotatably supported by the bearing 16,
Between the lid member 4 and the crankshaft 24, the small diameter portion 1 of the boss 8 is provided.
It is adapted to be sealed by a lip seal 29 which is a seal member attached to 0. The crank pin 27 of the crank shaft 24 is adapted to be fitted inside a bush 48 described later. A balance weight 28 is provided on an end surface of the crank arm 26 of the crank shaft 24 to cancel an unbalance amount given to a revolving scroll 41 described later.

The lip seal 29 has a small diameter portion 10 of the boss 8.
And a lip portion that is integrally provided on the inner peripheral side of the main body portion. It is designed to be sealed. The lip seal 29 is made of a rubber-like elastic body, synthetic resin or the like.

The fixed scroll 32 is a disk-shaped substrate 33.
And a fixed wrap 34 having a spiral shape that is integrally erected on one end surface of the substrate 33. With the fixed wrap 34 facing the lid member 4, the substrate 33 is fixed to the housing body 3. It is configured to be fixed to the housing body 3 by being fastened to the bottom portion with bolts.

An O-ring 35 is interposed between the outer peripheral surface of the base plate 33 of the fixed scroll 32 and the inner peripheral surface of the housing body 3, and the O-ring 35 seals the two parts to the left side portion of the base plate 33. A suction chamber 37 is formed in the interior of the chamber, and a discharge cavity 38 is formed in the right side portion. The suction chamber 37 communicates with a refrigerant gas suction port (not shown) provided in the housing main body 3, and the discharge cavity 3
The reference numeral 8 communicates with a discharge port (not shown) provided in the housing body 3.

A discharge port 36 penetrating the substrate 33 in the axial direction is provided at the center of the substrate 33 of the fixed scroll 32, and the discharge port 36 is opened and closed by a discharge valve 39 provided on the discharge cavity 38 side. It has become. The opening / closing angle of the discharge valve 39 is limited by a stopper 40 provided outside the discharge valve 39.

The orbiting scroll 41 comprises a disc-shaped substrate 42.
And a swirl-side swirl-side wrap 43 that is integrally provided upright on one end surface of the substrate 42.
Are formed to have substantially the same shape as the fixed side wrap 34 of the fixed scroll 32.

The orbiting scroll 41 is a fixed scroll 3
The housing 2 is provided so as to face the housing 2. Orbiting side wrap 43 of the orbiting scroll 41
And the fixed side wrap 34 of the fixed scroll 32 are eccentric to each other by the orbiting radius, and the side surface of the orbiting side wrap 43 and the side surface of the fixed side wrap 34 are in line contact with each other at a plurality of points. It is adapted to be engaged with each other with a phase of 180 °.

Tip seals 45 and 44 are attached to the tip end surface of the swivel side wrap 43 and the tip end surface of the fixed side wrap 34, respectively, and the tip seals 45 and 44 mesh the fixed side wrap 34 and the swivel side wrap 43 with each other. When they are engaged with each other, they are brought into close contact with the mating base plates 42 and 33, respectively, so that a plurality of closed spaces between the fixed side wrap 34 and the swiveling side wrap 43 are substantially symmetrical with respect to their centers. Room 5
0 is formed.

A cylindrical boss 46 is integrally provided at the center of the other end surface of the base plate 42 of the orbiting scroll 41 in a state of protruding in the axial direction, and a rotative bearing 47 is provided inside the boss 46. A bush 48 is rotatably mounted, and the crank pin 27 of the crankshaft 24 is fitted inside the bush 48.

A rotation preventing portion 49 is provided on the outer peripheral side of the boss 46 of the orbiting scroll 41. The rotation preventing portion 49 allows the revolution orbiting operation of the orbiting scroll 41,
It is designed to prevent its rotation.

The main shaft 25 of the crankshaft 24 is connected to the engine side through a power transmission member such as a magnet clutch and a pulley which are not shown.

When the engine is driven to rotate the crankshaft 24 via the power transmission member, the orbiting scroll 41 is prevented from rotating by the rotation preventing portion 49, and the crankpin 27, the bush 48, and the orbiting bearing are rotated. The main shaft 25 of the crankshaft 24 via the 47 and the boss 46.
A revolving motion is performed on a circular orbit having a radius of the eccentric amount of the crank pin 27 around the center of As a result, the fixed side wrap 34
The line contact portion between the swirl side wrap 43 and the swirl side wrap 43 gradually moves toward the center of the spiral, and the compression chamber 50 moves toward the center of the spiral while reducing the volume. Therefore, the refrigerant gas flowing into the suction chamber 37 from the suction port is compressed from the outer peripheral side opening between the fixed side wrap 34 and the swirling side wrap 43 to the compression chamber 50.
After being sucked in, it reaches the center while being compressed, and pushes open the discharge valve 39 to guide it into the discharge cavity 38,
It is discharged to the outside from a discharge port (not shown).

In this case, part of the refrigerant gas sucked from the suction port into the suction chamber 37 is partially discharged from the suction chamber 37 into the main oil groove 14.
And the auxiliary oil groove 15 are introduced to the large diameter portion 9 of the boss 8 through the oil passage 13, and the atomized oil component contained in the refrigerant gas is applied to the lip portion of the lip seal 29 of the large diameter portion 9. As a result, the space between the lip and the main shaft 25 is lubricated.

In the scroll compressor 1 described above,
Since the oil passage 13 that guides the oil contained in the refrigerant gas sucked into the suction chamber 37 from the suction chamber 37 to the lip seal 29 is provided, the lip portion of the lip seal 29 is worn due to poor lubrication and the suction chamber 37 The refrigerant gas inside does not leak to the outside through the lip portion 31, and stable compression performance can be obtained for a long period of time.

Further, since the main oil groove 14 and the sub oil groove 15 are formed by casting, the grooves 14 and 15 can be easily processed, and the manufacturing cost can be reduced.

In the above description, the main oil groove and
The oil passage 13 is formed by the auxiliary oil groove 15, but the oil passage 13 may be formed only by the main oil groove 14, and in this case, the oil component that has passed through the main oil groove 14 is the inner bearing. It acts on the lip seal 29 through the space between the 16 and the lip seal 29. Further, in the present invention, the above description has been made by using the lip seal as the seal member, but naturally a seal member such as a mechanical seal also exhibits the same effect as the above effect according to the present invention.

[0041]

As described above, according to the present invention, the portion of the housing corresponding to the bearing is provided with the oil passage for guiding the oil contained in the refrigerant gas introduced into the housing to the seal member. Therefore, the oil content can be reliably supplied to the seal member. Therefore, the seal member will not be worn due to poor lubrication, the sealability will not be deteriorated due to the wear of the seal member, and the refrigerant gas will not leak out to reduce the compression performance. It will be possible to exert it in the long term. Further, since the oil passage of the housing is formed by casting, it is easy to process and the manufacturing cost can be reduced. further,
The oil passage is inclined in the rotation direction of the crankshaft from the refrigerant gas suction port toward the seal member, so that the oil component contained in the refrigerant gas is reliably supplied to the seal member side through the oil passage. Therefore, it is possible to prevent wear due to poor lubrication of the seal member and prevent deterioration of the sealability, so that a predetermined compression performance can be obtained for a long period of time. Further, the oil passage includes a main oil groove provided in a portion of the housing with respect to the bearing and directed in an axial direction, and a sub oil groove provided in a portion continuous with a portion in which the main oil groove is provided and oriented in a direction orthogonal to the axis. Therefore, it is possible to more effectively supply the oil component contained in the refrigerant gas to the seal member side through the oil passage, prevent wear due to poor lubrication of the seal member, and prevent deterioration of the sealability. Therefore, the predetermined compression performance can be obtained in the long term.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a scroll compressor according to the present invention.

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

FIG. 3 is a sectional view taken along line BB of FIG.

FIG. 4 is an explanatory view showing a modified example of a main oil groove.

FIG. 5 is a cross-sectional view showing an example of a conventional scroll compressor.

[Explanation of symbols]

1 scroll type compressor 2 housing 13 oil passage 14 Main oil groove 15 Secondary oil groove 16, 20 bearing 24 crankshaft 29 Seal member (lip seal) 32 fixed scroll 41 Orbiting scroll

Claims (4)

[Claims] 1. A housing, a fixed scroll and an orbiting scroll which are provided in the housing and mesh with each other, and rotatably provided in the housing through a bearing, and between the housing and the housing. A crankshaft that is sealed by a seal member and that is connected to the orbiting scroll, and by rotating the crankshaft to orbit the orbiting scroll,
In a scroll compressor in which a refrigerant gas is sucked into the housing and an oil component contained in the refrigerant gas is supplied to the seal member via the bearing, in the portion of the housing corresponding to the bearing, the housing A scroll compressor, wherein an oil passage for guiding an oil component contained in a refrigerant gas introduced into the seal member is formed. 2. The scroll compressor according to claim 1, wherein the oil passage of the housing is formed by casting. 3. The scroll compressor according to claim 1, wherein the oil passage is inclined in a rotation direction of the crankshaft from a suction port of the refrigerant gas toward a seal member. Characteristic scroll type compressor. 4. The scroll compressor according to claim 1, 2 or 3, wherein the oil passage is provided in a portion of the housing with respect to the bearing and faces the axial direction, and the main oil groove. A scroll-type compressor, characterized in that it comprises a sub oil groove which is provided in a part continuous with the part in which the sub oil groove is oriented in a direction orthogonal to the axis.