JP2000110757A - Vertical scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To effectively cool the electromotive element and the like by providing, inside the sealed container, a lubricating oil reservoir above the support frame provided underneath the electromotive element so that it rotatably supports the rotatioal shaft to supply the lubricating oil to the sliding portion of the rotational shaft and the support frame by a differential pressure method. SOLUTION: On starting operation, the refrigerant gas passes through an intake pipe 7 and a scroll compression element 6, and is discharged inside a sealed container 2 from a discharge port 19. Then the discharged gas passes to an electromotive element 3, where the lubricating oil contained in the refrigerant gas is separated out. The separated lubricating oil is accumulated in a lubricating oil reservoir 73. A lubricating oil b accumulated in this lubricating oil reservoir 73 is supplied by a differential pressure to a sliding portion 11 of a rotational shaft 4 and a support frame 5, through an oil supply pipe 74. In addition to lubricating the sliding portion 11, the oil is also supplied from the oil supply pipe 74 through an oil supply hole 75 to lubricate the sliding portion of a scroll compression element 6. The lubricating oil also provides a gas seal at the sliding face. It is discharged from a discharge port 19 together with refrigerant gas into a sealed container 2, and recirculated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vertical scroll compressor mounted on, for example, an air conditioner / refrigerator and the like, and more particularly, to a compressor in which a fixed scroll and an orbiting scroll are engaged. The present invention relates to a vertical scroll compressor that discharges compressed gas into an airtight container and then discharges the gas outside the airtight container.

[0002]

2. Description of the Related Art A vertical scroll compressor used in a refrigeration cycle of an air conditioner or the like is disclosed in, for example, Japanese Patent Application No. 9-252125.
It has a configuration shown in FIG. The compressor shown in FIG. 3 is a vertical scroll compressor 20, which includes a closed container 21 formed in a cylindrical shape with both ends closed. An electric element 22 (DC brushless motor) and a scroll compression element 23 driven by the electric element 22 are accommodated in the closed container 21.

The electric element 22 has a stator 24 fixed inside the closed casing 21 and a rotor 25 located at the center of the stator 24. A rotation shaft 26 oriented in the center direction is connected in a penetrating state, and one end of the rotation shaft 26 is penetrated through the center of a support frame 27 that supports the scroll compression element 23 and is rotatably supported. Here, the support frame 27 is connected and fixed to the inner wall surface of the sealed container 21. The rotation shaft 26 has a support frame 27 at a middle portion on one end side.
The rotor 25 is supported on the inner wall surface side of the closed casing 21 via a rotating shaft 26 and a support frame 27.

A pin (crank) 29 is formed at the end of the rotating shaft 26 that penetrates the support frame 27, the center of the rotating shaft 26 being eccentric to the axis of the rotating shaft 26. An orbiting scroll 30 is connected to the pin portion 29. The orbiting scroll 30 includes a boss hole 31 inserted into and connected to the center of one side surface of a disk-shaped end plate and a spiral wrap 32 formed on the other side surface of the end plate. A fixed scroll 33 is connected to the support frame 27. The fixed scroll 33 has a spiral wrap 35 which is alternately positioned on the wrap 32 of the orbiting scroll 30 and forms a plurality of compression chambers 34.

[0005] A refrigerant gas suction pipe 36 penetrating through the closed casing 21 is connected to the side wall surface of the fixed scroll 33. At the center of the fixed scroll 33, a discharge port 37 for discharging the compressed refrigerant gas into the closed container 21 is provided. And, the suction side of the scroll compression element 23 for the refrigerant gas sucked from the suction pipe 36,
Since the back surface of the orbiting scroll 30 (the surface on the side where the boss hole 31 of the end plate is located) and the supporting frame 27 are communicated with each other at the peripheral edge of the end plate of the orbiting scroll 30, the pressure during this period is reduced by the refrigerant gas It is almost as low as the suction side and lower than the pressure in the closed container 21.

The other end of the rotary shaft 26 has a differential pressure type
8 are provided. The refueling section 38 is provided in the closed container 21.
Sub-support frame 41 having a sub-bearing portion 40 mounted inside and supporting the rotary shaft 26 and having an oil inlet 39
It has. A bearing 42 is interposed between the auxiliary support frame 41 and the rotary shaft 26, and a receiving portion 43 of the bearing 42 is provided on the auxiliary bearing portion 40.

An oil passage 44 is formed in the rotary shaft 26 from one end to the other end. Here, lubricating oil b is accommodated in the sealed container 21 to a predetermined level, and the lubricating oil b is sucked up from the oil supply unit 38 by the above-described differential pressure and passes through the oil passage 44 provided in the rotary shaft 26. After that, it is sent to each sliding portion including the bearing portion 28 and the scroll compression element 23, and is circulated and used.

When the operation of the vertically mounted scroll compressor 20 constructed as described above is started, the refrigerant gas is supplied to the suction pipe 3.
6 to the suction position 50 on the outer peripheral portion of the scroll compression element 23.
And is compressed by gradually moving to the center. The discharge port 3 provided at the center of the fixed scroll 33
7, the lubricant is discharged into the closed container 21, and the entrained lubricating oil is separated in this space, and the pulsation is also reduced. The discharged gas flows through a passage (not shown) provided in the fixed scroll 33 and the support frame 27 as shown by a white arrow, and
It goes to the second side and is discharged from the discharge pipe 47 to the outside of the closed container 21. The separated lubricating oil flows as shown by the black arrows, accumulates at the bottom of the closed container 21, and is circulated for use.

[0009] The vertical type scroll compressor 20 includes:
As the operation is continued, the temperature of the sealed container 21 and the electric element 22 (DC brushless motor) increases and reaches, for example, about 150 ° C. or more, and demagnetization of the magnet and defective insulation of the coil, insulating paper, binding paper, etc. occur. However, there is a possibility that an accident such as burning of the motor may occur, and there is a problem that the separation of the lubricating oil is poor and the refrigerant gas is discharged from the discharge pipe 47 to the outside.

In order to solve this problem, a vertical scroll compressor 50 shown in FIG. 2 has been proposed (Japanese Patent Laid-Open No. 3-145590). The vertical scroll compressor 50 includes an airtight container 51 formed in a cylindrical shape with both ends closed. An electric element 52 is installed in the upper part of the sealed container 51, and a scroll compression element 53 driven by the electric element 52 is accommodated below the electric element 52. Electric element 52, stator 54,
The rotor 55, the rotating shaft 56, the support frame 57, the bearing 58 of the support frame 57, the orbiting scroll 53 </ b> A, the fixed scroll 53 </ b> B, etc.
It is the same as the case of 0.

[0013] A suction pipe 59 for the refrigerant gas penetrated through the closed casing 51 is connected to the side wall surface of the scroll compression element 53. A discharge port 60 for discharging the compressed refrigerant gas into the closed vessel 51 is provided at the center of the scroll compression element 53. The upper end of the rotating shaft 56 is provided with a sub-supporting frame 62 having a sub-bearing portion 61 mounted in the closed container 51 and supporting the rotating shaft 56. A bearing 63 is interposed between the auxiliary support frame 62 and the rotating shaft 56. Here, lubricating oil b is stored in the sealed container 51 to a predetermined level, and the lubricating oil b is sent to each sliding portion including the bearing portion 58 and the scroll compression element 53 by an oil pump (not shown), and is circulated. Has been used.

When the operation of the vertical scroll compressor 50 constructed as described above is started, the refrigerant gas is supplied to the suction pipe 5.
9 to the outer periphery of the scroll compression element 53
It is compressed by gradually moving to the center, and the discharge port 6
It is discharged into the closed container 51 from 0. The discharged gas flows as indicated by the white arrow, goes to the electric element 52 side, and is discharged from the discharge pipe 64 to the outside of the closed container 51. The separated lubricating oil accumulates at the bottom of the closed vessel 51 or the like and is circulated for use.

The vertical type scroll compressor 50 includes:
Even if the operation is continued, there is no problem that the temperature of the sealed container 51 or the electric element 52 becomes high or there is no problem that the separation of the lubricating oil is bad. However, in the case of the vertical scroll compressor 50, the high pressure of the refrigerant gas in the closed vessel 51 is applied to the orbiting scroll 53A, and the refrigerant gas is pressed in a state where the orbiting scroll 53A is pressed against the fixed scroll 53B at a high pressure. Is performed. Therefore, when the pressing force is reduced, the compression efficiency is reduced, and it is necessary to use an oil pump to supply the lubricating oil to each sliding portion including the bearing portion 58 and the scroll compression element 53 at a high pressure. Was.

[0014]

SUMMARY OF THE INVENTION It is an object of the present invention to provide a differential pressure lubrication system which does not increase the temperature of a closed vessel or an electric element even if the operation is continued, and does not use a lubrication system using an oil pump. An object of the present invention is to provide a simple vertical scroll compressor having a configuration in which lubrication and gas sealing can be easily performed on each sliding portion including a bearing portion and a scroll compression element even when lubricating oil is supplied.

[0015]

That is, according to the first aspect of the present invention, an electric element is provided at an upper portion in a closed container, a support frame rotatably supporting a rotating shaft below the electric element, A scroll compression element supported below the support frame and driven by a rotary shaft, and a lubricating oil housed in a sealed container, lubricating oil is supplied to each sliding portion and circulated for use. A vertically mounted scroll compressor that compresses refrigerant gas drawn into the scroll compression element, discharges the compressed refrigerant gas into a closed container, and then discharges the refrigerant gas to the outside, wherein a lubricating oil reservoir is provided at an upper portion of the support frame. The lubricating oil is supplied from the reservoir to the sliding portion of the rotating shaft and the support frame by a differential pressure lubricating method, and an oiling hole is provided at the center of the rotating shaft so as to penetrate from the lower end to the vicinity of the sliding portion. Through the A vertical-type scroll compressor and supplying the lubricating oil to the sliding portion of the crawl compression element.

According to a second aspect of the present invention, in the vertical scroll compressor according to the first aspect, the DC brushless motor includes a rotor in which the electric element is fixed to a rotating shaft. And the magnetic center of the rotor is set so that the magnetic center of the rotor is slightly lower.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawing shown in FIG. FIG. 1 is an explanatory view showing one embodiment of a vertical type scroll compressor according to the present invention.

The compressor shown in FIG. 1 is a vertical scroll type compressor 1 having a closed container 2 formed in a cylindrical shape with both ends closed. In the closed container 2, an electric element 3 (DC brushless motor) is provided on the upper part, a support frame 5 for rotatably supporting the rotary shaft 4 below the electric element 3, and supported below the support frame 5, Scroll compression element 6 driven by rotating shaft 4
And are provided. A lubricating oil b is contained in the sealed container 2. The lubricating oil b is supplied to each sliding portion and circulated for use as described later. The refrigerant gas sucked into the scroll compression element 6 from the suction pipe 7 is compressed and once discharged into the closed casing 2, and then discharged from the discharge pipe 8 to the outside.

The electric element 3 has a stator 9 fixed inside the closed casing 2 and a rotor 10 located at the center of the stator 9, and the center of the rotor 10 has a shaft of the closed casing 2. A rotating shaft 4 oriented in the direction of the center is connected in a penetrating state, and one end of the rotating shaft 4 is penetrated through a central portion of a support frame 5 that supports the scroll compression element 6 and is rotatably supported. Here, the support frame 5 is connected and fixed to the inner wall surface of the closed container 2. The rotating shaft 4 is rotatably supported at one end by a bearing 11 of the support frame 5, and the rotor 10 is supported on the inner wall surface of the sealed container 2 via the rotating shaft 4 and the support frame 5. Have been.

The rotary shaft 4 penetrating the support frame 5
A pin portion (crank portion) 12 whose center is provided eccentrically with respect to the axis of the rotating shaft 4 is formed at the end of the shaft. An orbiting scroll 13 is connected to the pin portion 12. The orbiting scroll 13 has a boss hole portion 14 connected to the center of one side surface of the disk-shaped end plate by inserting the pin portion 12 and a spiral wrap 15 formed on the other side surface of the end plate. A fixed scroll 16 is connected to the support frame 5. The fixed scroll 16 has a spiral wrap 18 which is alternately positioned on the wrap 15 of the orbiting scroll 13 and forms a plurality of compression chambers 17.

A suction pipe 7 for the refrigerant gas penetrated through the closed casing 2 is connected to a side wall surface of the fixed scroll 16. A discharge port 19 for discharging the compressed refrigerant gas into the closed container 2 is provided at the center of the fixed scroll 16.
Is provided. The suction side of the scroll compression element 6 for the refrigerant gas sucked from the suction pipe 7 and the back surface of the orbiting scroll 13 (the surface on the side where the boss hole 14 of the end plate is located)
And the supporting frame 5 are communicated with each other at the peripheral edge of the end plate of the orbiting scroll 13, so that the pressure therebetween is almost as low as the refrigerant gas suction side and lower than the pressure in the closed casing 2.

The upper end of the rotating shaft 4 is provided with a sub support frame 71 having a sub bearing 70. A bearing 72 is interposed between the sub-support frame 71 and the rotating shaft 4.

A lubricating oil reservoir 73 is provided above the support frame 5.
One end is inserted into the lubricating oil b stored in the lubricating oil sump 73, and an oil supply pipe 74 whose other end passes through the bearing 11 and reaches the rotary shaft 4 is mounted. The lubricating oil b stored in the lubricating oil sump 73 is pushed by the high-pressure refrigerant gas in the sealed container 2, while the pressure between the back surface of the orbiting scroll 13 and the support frame 5 is reduced as described above. The lubricating oil b is supplied from the lubricating oil reservoir 73 to the sliding portion 11 through the oil supply pipe 74 to lubricate the sliding portion 11 and to reduce the sliding surface. Gas seal. Further, an oil supply hole 75 is provided at the center of the rotary shaft 4 so as to penetrate from the lower end of the rotary shaft 4 to the vicinity of the sliding portion 11, and a small hole communicating the sliding portion 11 and the oil supply hole 75 is provided. Therefore, the lubricating oil b is
The lubrication is performed by supplying the lubricant to the sliding portion of the scroll compression element 6 through the above, and the sliding surface of the scroll compression element 6 can be gas-sealed.

Also, an electric element (DC brushless motor)
Since the magnetic center of the rotor 10 fixed to the rotating shaft 4 is set to be slightly lower than the magnetic center C of the motor by a predetermined amount d, the vertical-type scroll compressor 1 of the present invention is provided.
A force for lifting the rotary shaft 4 upwards is exerted regardless of whether the operation is performed or the operation is stopped. This force is received by a bearing 72 mounted on a sub bearing 70 that rotatably supports the upper end of the rotating shaft 4. However, since this force is not a large force, a special thrust mechanism is not required for the auxiliary bearing portion 70.

When the operation of the vertical scroll compressor 1 constructed as described above is started, the refrigerant gas is sucked from the suction pipe 7 into the suction position 76 on the outer periphery of the scroll compression element 6 and gradually moves to the center. The compressed scroll is compressed and discharged into the closed container 2 from a discharge port 19 provided at the center of the fixed scroll 16. The discharged gas flows through the passage provided in the fixed scroll 16 and the support frame 5 as shown by the white arrow, goes to the electric element 3 side, and detects the centrifugal force due to the rotation of the rotor 10 and the stator 9 and the sub support frame 71. The lubricating oil in the refrigerant gas is further separated by a baffle plate effect or the like, and the refrigerant gas from which the lubricating oil has been separated is discharged from the discharge pipe 8 to the outside of the closed container 2. The separated lubricating oil flows as indicated by the black arrow and accumulates in the lubricating oil sump 73. The lubricating oil b accumulated in the lubricating oil sump 73 is supplied to the sliding portion 11 of the rotating shaft 4 and the support frame 5 through the oil supply pipe 74 by the differential pressure to lubricate the sliding portion 11 and to reduce the sliding surface with gas. Seal. Further, the lubricating oil b accumulated in the lubricating oil reservoir 73 is supplied to the sliding portion of the scroll compression element 6 through the oil supply pipe 74 through the oil supply hole 75 to lubricate the sliding portion and to seal the sliding surface with a gas seal. Then, the compressed refrigerant gas is discharged from the discharge port 19 into the closed container 2 together with the compressed refrigerant gas, and is circulated for use.

The Oldham rim ring 77 is interposed between the support frame 5 and the orbiting scroll 13 so that the orbiting scroll 13 does not rotate with respect to the fixed scroll 16 when the electric element 3 is driven. It revolves around a circular orbit.

Since the present invention is not limited to the above embodiment, various modifications can be made without departing from the spirit of the appended claims.

[0028]

The vertical type scroll compressor of the present invention has the following features.
Since the electric element is provided at the upper part in the sealed container and the scroll compression element is provided below the electric element, the lubricating oil separating effect is improved, and the electric element and the like are cooled by the refrigerant gas, so that the operation can be continued. The temperature of the sealed container and the electric element does not rise. The oil supply hole provided at the center of the rotating shaft does not need to be provided so as to penetrate from the lower end to the upper end of the rotating shaft, and may have a length penetrating from the lower end of the rotating shaft to the vicinity of the sliding portion. Processing is easy and the number of processing steps can be reduced. In addition, lubricating oil is supplied by a simple differential pressure lubrication system, and lubrication and gas sealing can be easily performed on each sliding portion including the bearing and the scroll compression element, and there is no need to use a special lubrication system such as an oil pump. . The vertical-type scroll compressor of the present invention has a simple structure, so that the whole unit can be made compact, and the sealability, lubricity, reliability, compression efficiency and the like are high.

If a DC brushless motor is used and the magnetic center of the motor and the rotor is set so that the rotor is slightly lower, the rotation of the vertical scroll compressor according to the present invention can be performed regardless of whether the compressor is operating or stopped. Since the force for lifting the shaft works to reduce the sliding resistance, the load on the electric element can be reduced. This force is received by the bearing mounted on the sub-bearing portion, but since the force is small, a special thrust mechanism is not required for the sub-bearing portion.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a vertical scroll compressor according to the present invention.

FIG. 2 is a cross-sectional view showing the overall configuration of a conventional vertical scroll compressor.

FIG. 3 is a cross-sectional view showing the overall configuration of another conventional vertical scroll compressor.

[Explanation of symbols]

 b Lubricating oil 1 Vertical scroll compressor 2 Closed vessel 3 Electric element 4 Rotating shaft 5 Support frame 6 Scroll compression element 10 Rotor 11 Bearing 73 Lubricating oil reservoir 75 Oil supply hole

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Takehiro Nishikawa 2-5-1-5 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Takashi Sato 2-chome, Keihanhondori, Moriguchi-shi, Osaka No. 5 Sanyo Electric Co., Ltd. (72) Inventor Kazuaki Fujiwara 2-5-5 Keihanhondori, Moriguchi-shi, Osaka F-term in Sanyo Electric Co., Ltd. 3H029 AA02 AA13 AB03 BB01 BB12 BB16 BB31 BB42 CC07 CC17 CC22 CC33 3H039 AA03 AA06 AA12 BB07 BB11 BB13 BB15 BB28 CC05 CC08 CC12 CC32 CC42

Claims (2)

[Claims] An electric element is provided in an upper part of a closed container, a support frame rotatably supporting a rotary shaft below the electric element, and a scroll supported below the support frame and driven by the rotary shaft. A compression element, and a lubricating oil contained in a closed container. The lubricating oil is supplied to each sliding portion and circulated for use. A vertical scroll compressor that discharges the lubricating oil to the outside, wherein a lubricating oil reservoir is provided at an upper portion of the support frame, and lubricating oil is supplied from the lubricating oil reservoir to the rotating shaft and the supporting frame by a differential pressure lubrication method. An oil supply hole is provided at the center of the rotating shaft and penetrates from the lower end to the vicinity of the slide portion, and lubricating oil is supplied to the slide portion of the scroll compression element through the oil supply hole. Especially Vertical scroll compressor. 2. A DC brushless motor in which the electric element includes a rotor fixed to a rotating shaft, wherein the magnetic center of the motor and the rotor is set so that the magnetic center of the rotor is slightly lower. The vertical scroll compressor according to claim 1, characterized in that: