JPH06288366A - Scroll type compressor - Google Patents

Abstract

PURPOSE:To attain the reduction in weight and cost of a compressor, and prevent the seizure of the compressor. CONSTITUTION:A second thrust bearing 5 is arranged between a stepped part formed by reducing the diameter of a driving shaft 10 by a prescribed value and a stepped part formed on a block 18 on the lower side of a main bearing 20, so that an oscillating scroll member 26 can be protected from the force adding to the axial lower part of the driving shaft 10. Since the upper part of the main bearing 20 is blocked by a seal member 51, and the lower part is blocked by a second thrust bearing 50, the pressure of the main bearing 20 part can be kept at high pressure, and also reduced on the upper stream side of the first thrust bearing by a lubricating oil throttle mechanism downsteam of the main bearing 20, the back surface pressure of the oscillating scroll member 26 can be set to a low pressure or middle pressure. Thus, the oscillating scroll member 26 can be prevented from being pressed onto a fixed scroll member 24.

Description

Detailed Description of the Invention

[0001] The present invention relates to a scroll type compressor for compressing sucked refrigerant by changing the volume of a compression chamber formed by a fixed scroll member and an orbiting scroll member.

[0002]

2. Description of the Related Art Conventionally, in a scroll type compressor, a fixed scroll member and an orbiting scroll member define a compression chamber, and the orbiting scroll member oscillates relative to the fixed scroll member, so Lubrication and sealing on the sliding contact surface of are important problems.

To solve this problem, for example, Japanese Patent Laid-Open No. 3-14
The scroll compressor disclosed in Japanese Patent No. 9391, by arranging a rotary positive displacement oil pump, reliably supplies a sufficient amount of oil to a bearing regardless of the flow rate of lubricating oil supplied to a compression work space. It is possible to do. As a result, a large amount of lubricating oil can be secured against a high load applied to the orbiting drive bearing, the eccentric bearing, and the first main bearing.

[0004]

However, in the above-mentioned reference, when the fixed scroll member and the orbiting scroll member are made of a material other than iron, such as aluminum, for reasons such as weight reduction and cost reduction of the compressor. Since the back pressure applied to the orbiting scroll member is high, the orbiting scroll member is pressed toward the fixed scroll member side, and the sliding contact portion between the orbiting scroll member and the fixed scroll member is seized. Dots occur.

Therefore, the present invention is to provide a scroll type compressor which can reduce the weight and cost and can prevent the seizure of the compressor.

[0006]

Therefore, the present invention is
An electric motor arranged in a high-pressure space in the sealed case, an oscillating scroll member eccentrically attached to a drive shaft of the electric motor, a fixed scroll member meshing with the oscillating scroll member to form a compression chamber, A block that fixes the fixed scroll member in a closed case, and sandwiches the orbiting scroll member together with the fixed scroll member so as to be rotatable, and a first thrust bearing that is interposed between the orbiting scroll member and the block. A scroll compressor having an oil circulation path for supplying lubricating oil to each of the sliding parts, the scroll type compressor being disposed between a through hole formed in the block and the drive shaft inserted into the through hole, A main bearing that holds the shaft rotatably; a lubricating oil throttle mechanism provided between the main bearing of the oil circulation path and the first thrust bearing; It arranged serial main above the drive shaft of the bearing and between the blocks, and a seal member for blocking between the high-pressure space and the main bearing side, in the lower side of the main bearing,
A second structure that is arranged between a step portion formed by reducing the diameter of the drive shaft by a predetermined value and a step portion formed in the block to support the drive shaft and to block the main bearing side and the low-pressure space. And a thrust bearing of.

[0007]

Therefore, in the present invention, the second thrust is provided below the main bearing between the step portion formed by reducing the diameter of the drive shaft by a predetermined value and the step portion formed in the block. By disposing the bearing, it is possible to protect the orbiting scroll member from a force applied in the axial downward direction of the drive shaft. In addition, since the upper part of the main bearing is blocked by the seal member and the lower part is blocked by the second thrust bearing, the pressure of the main bearing part can be maintained at a high pressure, and further the lubricating oil throttle mechanism downstream of the main bearing can be used to Since the pressure can be reduced on the upstream side of the first thrust bearing, the back pressure of the orbiting scroll member can be low or intermediate pressure. As a result, it is possible to prevent the orbiting scroll member from being pressed against the fixed scroll member, and the above-mentioned problem can be achieved.

[0008]

Embodiments of the present invention will be described below with reference to the drawings.

In the scroll compressor 1 shown in FIG. 1, a cylindrical member 3 provided with a refrigerant suction port 2, a lid member 4 closing the upper end of the cylindrical member 3, and a bottom member 5 closing the lower end thereof. And form a closed case 6. The lid member 4 includes a refrigerant discharge port 7 and an electric motor 8.
The power supply terminal 9 is provided.

The electric motor 8 is, for example, a DC brushless motor, a drive shaft 10, a rotor 11 fixed to the drive shaft 10 and having a permanent magnet arranged around the drive shaft 10, and a coil fixed to the inner peripheral surface of the cylindrical member 3. 12 and a stator 13 wound around it.

The drive shaft 10 is rotatably held by a drive shaft holding member 14 via a bearing 15, and has an upper end portion 10a to which an upper balance weight 16 is fixed and a rotor support portion 10b to which the rotor 11 is fixed. A balance portion 10c to which a lower balance weight 17 is fixed, a main shaft portion 10d inserted into a through hole 19 formed in a block 18 described below and rotatably held by a main bearing 20, and a central shaft of the drive shaft 10. An oil supply groove 21 formed by an eccentric shaft 10e that is eccentrically provided on the outer peripheral surface of the main shaft portion 10d, and one end opens at the upper end of the oil supply groove 21 and the other end It has an oil supply through hole 22 formed by opening at the lower surface of the eccentric shaft 10e. The space between the upper end of the main shaft portion 10d and the through hole 19 of the block 18 is sealed by a seal member 51, and the main bearing 20 is isolated from the high pressure chamber 60 formed in the upper part of the hermetic case 6. Further, the main shaft portion 10
A step portion is formed between d and the eccentric shaft 10e, and a thrust bearing (second thrust bearing) 50 is arranged between the step portion formed in the block 18 described below.

The block 18 is fixed to the inner peripheral surface of the cylindrical member 3 and has a through hole 19 formed through the center thereof.
And the refrigerant passage cover 23 is fixed to the upper end surface. A fixed scroll member 24 described below is fixed to the lower end surface by a screw 25, and thereby a swing scroll member 26 described below is rotatably sandwiched. A large diameter is formed below the through hole 19 so that the protruding portion 26f of the swing scroll member 26 in which the insertion hole 26a is formed can swing.

The block 18 has an Oldham ring housing groove 18a formed on the sliding surface with the orbiting scroll member 26, and the projections of the Oldham ring 27 are slidably inserted in both directions. Ring groove 18
b is formed. Further, a thrust bearing (first thrust bearing) 34 that receives the compression reaction of the orbiting scroll is provided on this sliding surface. A lubricating oil groove is formed in the first thrust bearing 34.

The orbiting scroll member 26 has an insertion hole 26a at the center of the upper end surface into which the eccentric shaft 10e is inserted, and the projections of the Oldham ring 27 are slidable on both side ends of the insertion hole 26a. The Oldham ring groove 26b on the orbiting scroll side to be inserted into is formed. A scroll scroll 26c formed in a spiral shape is formed on the lower end surface.

The fixed scroll member 24 has a fixed scroll 24a that meshes with the orbiting scroll 26c to define a compression chamber 28, and the refrigerant suction port 2 and the compression chamber 28 are provided on one side. Inhalation chamber 2 interposed between the tip and
4b is formed, and a refrigerant outlet 24c communicating with the final stage of the compression chamber 28 is formed in the center of the lower end surface. A cover 30 that defines the refrigerant discharge passage 29 is fixed to the lower end surface of the fixed scroll member 24. A bypass passage 31 that communicates with the refrigerant discharge passage 29 is formed near the middle of the compression chamber 28.
It is designed such that it is released when the pressure in 8 exceeds a predetermined value.

A scroll type compressor 1 having the above structure
When the electric motor 8 is driven, the oscillating scroll member 26 eccentrically attached to the drive shaft 10 of the electric motor 8
Performs a swinging motion with respect to the fixed scroll member 24,
The compression chamber 28 defined by the orbiting scroll 26c and the fixed scroll 24a gradually decreases in volume from the suction side to the discharge side. As a result, the refrigerant sucked from the refrigerant suction port 2 is compressed and discharged from the refrigerant outlet 24c to the refrigerant discharge passage 29, and the fixed scroll member 2
6 and the block 18 are provided with a refrigerant passage 3 formed continuously.
2 to reach a space (high pressure chamber) 60 in which the electric motor 8 is arranged. In this high pressure chamber 60, the electric motor 8
The lubricating oil mixed in the gas is separated by the rotation of, and the electric motor 8 is cooled, and then sent out from the refrigerant discharge port 7 to the next step. In addition, the separated lubricating oil described above passes through a groove formed on the outer peripheral surface of the block 18 (not shown) to the oil sump 33 formed in the lower portion of the closed case 6.
It accumulates in.

As shown in FIG. 2, a high pressure from the high pressure chamber 60 is applied to the lubricating oil contained in the oil sump 33, and a differential pressure between this high pressure and a low pressure on the suction side of the compression chamber 28 causes This lubricating oil is supplied to each part, and the lubricating oil accommodated in the oil sump 33 is sucked through the lubricating oil suction port 40 and fixed scroll member 25 and block 18
The oil passes through the oil supply passage 41 that is bored in and is discharged near the upper portion of the second thrust bearing 50. by this,
First, the second thrust bearing 50 is lubricated.

After that, as shown in FIG. 3, the lubricating oil lubricates the main bearing 20 and ascends in the oil supply groove 21 formed on the outer peripheral surface of the main shaft portion 10d to reach the upper end, From here, through the oil supply through hole 22, it reaches the bottom of the insertion hole 26a. From here, the lubricating oil is
While lubricating the sliding portion between the 6a and the eccentric shaft 10e,
Ascending along the sliding portion, from the upper end of the protruding portion 26f to the outside, through the lubricating oil groove 34a formed in the bearing 34, the Oldham ring groove 26b, and the Oldham ring housing groove 2
6b, the Oldham ring 27 is lubricated. The lubricating oil throttle mechanism may be provided with a throttle function by reducing the diameter of the oil supply through-hole 22 or by adjusting the clearance between the swing shaft 10e and the insertion hole 26a. It's good.

After that, the lubricating oil is used as the fixed scroll member 2.
The suction chamber 24b formed in FIG. 4 is sucked into the compression chamber 28 together with the sucked refrigerant to seal and lubricate the compression chamber 28.

As described above, the upper part of the main bearing 20 is blocked from the high pressure chamber 60 by the seal member 51, and the lower part is blocked from the suction side (low pressure side) by the second thrust bearing 50. It is possible to use direct current, and it is possible to perform efficient lubrication. Further, since the back pressure side of the orbiting scroll member 26, which is the downstream side of the main bearing 20 and the upstream side of the first thrust bearing 34, can be set to a low pressure or an intermediate pressure by the lubricating oil throttle mechanism, the pressure of the compression chamber 28 causes oscillation. Since the moving scroll member 26 can be pushed up in the direction away from the fixed scroll member 24, the friction between the orbiting scroll member 26 and the fixed scroll member 24 can be reduced, and seizure can be prevented.

Further, since the second thrust bearing 50 is provided on the step portion formed below the main shaft portion 10d with a small predetermined diameter, the sliding contact surface of the second thrust bearing 50 is reduced. Moreover, power loss can be reduced.

Further, instead of the above-mentioned seal member 51,
As shown in FIG. 4, an annular groove 7 is formed on the upper portion of the main shaft portion 10d.
It is also possible to shield the high-pressure chamber 60 and the main bearing 20 by forming a ring 0 and contacting the ring 71 fitted in the groove 70 with the inner peripheral surface of the through hole 19 formed in the block 18. .

[0023]

As described above, according to the present invention, the upper and lower sides of the main bearing are cut off from the high pressure and the low pressure by the seal member and the thrust bearing, respectively, so that the intermediate pressure is obtained.
Since the oscillating scroll member can be floated with respect to the fixed scroll member by the pressure of the compression chamber, sliding friction between the oscillating scroll member and the fixed scroll member can be reduced and seizure can be prevented.

[Brief description of drawings]

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

FIG. 2 is a partial cross-sectional view showing a lubricating oil path of the scroll compressor according to the embodiment of the present invention.

FIG. 3 is a partially enlarged cross-sectional view of a scroll compressor showing a seal portion according to the embodiment of the present invention.

FIG. 4 is a partially enlarged cross-sectional view of a scroll type compressor showing a seal portion according to another embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 scroll type compressor 6 hermetic case 8 electric motor 10 drive shaft 18 block 20 main bearing 24 fixed scroll member 26 rocking scroll member 33 oil sump 50 thrust bearing 51 seal member

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masakuni Ishikawa 39 Toyo-ji, Toyo, Konan-cho, Osa-gun, Saitama Prefecture Inside the Zekcel Konan Plant (72) Susumu Saito 39 Toyo-hara, Toyo-ji, Konan-cho, Osa-gun, Saitama Prefecture Address XXCELL Konan Factory (72) Inventor Nobukazu Takagi 39 Toyo, Konan-cho, Oza-gun, Saitama Prefecture Address XXEL Konan Factory (72) Satoshi Kawai 39 Toyohara, Chiyo-ji, Konan-cho, Oza-gun, Saitama Prefecture Address: XXCELL Konan Factory (72) Inventor Yukio Kazehaya 39, Toyo, Konan-cho, Oza-gun, Saitama Prefecture In-house Co., Ltd. (72) Tatsuo Nakatani Chiyo-ji, Konan-cho, Oza-gun, Saitama Prefecture 39, Higashihara Co., Ltd. at the XXEL Gangnam factory (72) Inventor Seiji Kuchiki Ora-cho, Ora-gun, Gunma Prefecture Shinozuka Oguro 1538 Tamama Manufacturing Co., Ltd.

Claims (1)

[Claims] 1. An electric motor arranged in a high-pressure space in a hermetically sealed case, an oscillating scroll member eccentrically attached to a drive shaft of the electric motor, and a fixing member meshing with the oscillating scroll member to form a compression chamber. A scroll member, a block for fixing the fixed scroll member in a hermetically sealed case, and sandwiching the orbiting scroll member with the fixed scroll member so as to be pivotable; and a block interposed between the orbiting scroll member and the block. In a scroll type compressor having a thrust bearing of No. 1 and an oil circulation path for supplying lubricating oil to each of the sliding parts, between a through hole formed in the block and the drive shaft inserted into the through hole. A main bearing that is arranged to rotatably hold the drive shaft, and lubrication provided between the main bearing and the first thrust bearing in the oil circulation path. A throttle mechanism, a seal member arranged between the drive shaft above the main bearing and the block, and blocking between the high-pressure space and the main bearing side, and a drive shaft below the main bearing. Second thrust which is arranged between a step formed by reducing the diameter of the shaft by a predetermined value and a step formed in the block to support the drive shaft and to shut off the main bearing side and the low pressure space. A scroll-type compressor comprising a bearing.