JP2003042080A - Hermetic scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve performance of a hermetic type scroll compressor and further stabilize the performance thereof. SOLUTION: A turning shaft 4a in a upper end of a crankshaft 4 is engaged with a turning bearing 32 provided to a turning scroll 7, and a oil passage 35 for the communication between a back pressure chamber 34 and a turning bearing part space 33 is provided to an end plate 7b of the turning scroll 7, where throttle means 35 is disposed. The oil passage 35 opens so as to be opposed to the inner periphery of the turning bearing part space 33 near the end part of the turning shaft 4a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic scroll compressor used for a refrigerating and air-conditioning apparatus, a refrigerator, etc. used for commercial use, household use, vehicle use and the like.

[0002]

2. Description of the Related Art The structure of a conventional scroll compressor will be described with reference to the structure disclosed in Japanese Patent Laid-Open No. 5-164068. FIG. 6 is a diagram showing a configuration of a conventional compressor. In FIG. 6, 101 is an airtight container, which houses the compression mechanism 102 and the electric motor 103, and the bottom of which forms an oil sump 123 to store lubricating oil. The electric motor 103 includes a stator 103 a fixed to the inner wall of the closed container 101 and a stator 10.
The rotor 103b is arranged to face the inner peripheral surface of the rotor 3a, and the rotor 103b is coupled to the crankshaft 104. The crankshaft 104 is the main bearing 105.
Both ends are axially supported by a and an auxiliary bearing.

The compression mechanism 102 slidably sandwiches an orbiting scroll 107 between a frame 105 and a fixed scroll 106, and the fixed scroll 106 and the orbiting scroll 107 are meshed with each other to form a crescent-shaped compression chamber 109. Have been combined as is done. An Oldham ring 108 is provided between the orbiting scroll 107 and the frame 105 so as to prevent rotation of the orbiting scroll 107 and guide the orbiting scroll 107 in a circular orbital motion. The orbiting scroll 107 is provided with an orbiting shaft 107a on the side opposite to the end plate of the orbiting plate, and is slidably coupled to the main shaft 104a via an orbiting bearing 130. When the crankshaft 104 rotates due to the rotational force generated by the electric motor 103, the main shaft 104a formed at the tip of the crankshaft 104 performs an eccentric rotary motion, but the main shaft 104a is slidably coupled to the revolving shaft 107a, and Since the orbiting scroll 107 is restrained from rotating, the orbiting scroll 107 makes a circular orbital motion. As a result, the compression chamber 109 formed between the fixed scroll 106 and the orbiting scroll 107 repeats the compression operation of reducing the volume thereof while moving from the outer peripheral side to the central portion. Due to this compression operation, the refrigerant gas sucked from the suction pipe 110 communicating with the outside of the closed container 101 is sucked into the compression mechanism through the suction port 111, becomes a predetermined pressure or more, and is discharged from the discharge port 112 at the center of the fixed scroll 106. The valve 113 is pushed open and the discharge chamber 120 is discharged.

The refrigerant gas discharged into the discharge chamber 120 passes between the fixed scroll 106 and a communication hole (not shown) provided in the outer peripheral portion of the frame 105, and then passes between the electric motor 103 or the stator 103a and the sealed container 101. Through the communication hole 132 of the auxiliary bearing member 121, and the discharge pipe 1
It is discharged from 22 to the outside of the closed container.

The refueling mechanism is constituted by a pump 124 driven by the crankshaft 104, and the closed container 1
01 Lubricating oil in the oil sump 123 at the bottom is passed through the oil hole 131 extending vertically through the crankshaft 104 to the slewing bearing 13
Supply to the bottom. The supplied lubricating oil is branched into two systems here.

The first oil supply system lubricates the sliding portion between the orbiting bearing 130 and the orbiting shaft 107a of the orbiting scroll 107, and then lubricates the sliding portion between the main shaft 104a of the crankshaft 104 and the main bearing 105a of the frame 105. And cover 1
It is discharged into 25. Further, the lubricating oil discharged from the cover 125 is the stator 103a at the bottom of the closed container 101.
And between the closed container 101 and the auxiliary bearing member 12
It passes through the first communication hole 133 and returns to the vicinity of the suction of the pump 124.

In the case of the scroll compression mechanism, the second oil supply system requires seal oil for preventing leakage of refrigerant gas from the compression chamber formed between the fixed scroll and the orbiting scroll wrap, and supplies this seal oil. It is a system.

The outer peripheral portion of the orbiting scroll 107, that is, the back pressure chamber 126 composed of the fixed scroll 106 and the frame 105 communicates with the suction portion (not shown) and has a suction pressure (low pressure). The back pressure chamber 126 is the frame 10
The outer peripheral portion is partitioned into a suction pressure (low pressure) portion and the inner peripheral portion is partitioned into a discharge pressure (high pressure) portion by a seal member 127 provided in FIG. Further, the orbiting scroll 107 is provided with an oil passage 129 having a throttle means 128 for guiding an appropriate amount of lubricating oil of the high pressure portion to the low pressure portion, and the orbiting scroll 1 is provided on the low pressure side.
On the outer periphery of 07, the high-pressure side opens at the tip of the swivel shaft 107a, and the oil passage 129 faces the bottom of the accommodating part of the swivel bearing 130.

The lubricating oil supplied to the bottom of the housing of the slewing bearing 130 is guided to the back pressure chamber 126 through the oil passage 129 and the throttle means 128. The back pressure chamber 126 communicates with the suction section, and the lubricating oil is compressed together with the sucked refrigerant gas into the compression chamber 109.
Is sucked into. Then, from the discharge port 112 to the discharge chamber 12
It is discharged at 0 together with the refrigerant gas. As described above, the refrigerant gas is the compression mechanism 102, the electric motor 103, the auxiliary bearing member 1
Although it is discharged from the discharge pipe 122 through the discharge pipe 122 to the outside of the closed container, it is separated into gas and liquid, and the lubricating oil in the refrigerant gas is separated and returned to the oil sump 123 at the bottom of the closed container 101.

[0010]

In the above-mentioned prior art, the orbiting scroll is provided with the orbiting shaft, and since the orbiting shaft serves as a shaft for driving the orbiting scroll, the diameter is designed so as to ensure a certain strength. There is a need. In addition, the crankshaft houses a swivel bearing that supports this swivel shaft,
Moreover, since the main shaft is formed on the outer peripheral portion of the main shaft, the diameter of the main shaft becomes large, which is a cause of increasing the mechanical loss of the main bearing portion.

Further, since the oil passage leading to the seal oil is provided on the orbiting shaft, when the supply amount from the pump is small, the lubricating oil is moved to the outer peripheral side of the orbiting bearing bottom by the centrifugal force due to the rotation of the crankshaft. However, there is a problem that the oil may not be supplied to the oil passage, the sealing property of the compression chamber may be deteriorated, and the performance may be deteriorated.

The object of the present invention is to solve these problems,
While improving the performance of the hermetic scroll compressor,
It is to stabilize the performance.

[0013]

In order to achieve the above object, a first invention of the present application is to form a slewing bearing housing portion on a side opposite to a wrap of an orbiting scroll end plate, and to form a slewing bearing housed in the housing portion. The eccentric shaft portion of the crankshaft and the orbiting scroll are slidably coupled to each other via
The high-pressure space and the low-pressure space on the rear surface of the orbiting scroll end plate partitioned by the partitioning means are communicated with each other through an oil passage having a throttling means, and the oil passage is provided inside the orbiting scroll end plate and the inlet on the high pressure side is an end of the orbiting shaft. It is located in the vicinity of the portion and is opened to the inner peripheral side of the slewing bearing housing. As a result, the diameters of the swivel shaft and the main shaft can be kept to the minimum necessary, which reduces mechanical loss in the bearing and improves efficiency, while at the same time reducing the amount of lubricating oil supplied from the pump to the crank. Due to the centrifugal force generated by the rotation of the shaft, the oil near the inlet of the oil passage will always be filled with lubricating oil, and there will be no lack of seal oil, and the leakage of refrigerant gas from the compression chamber can be prevented, ensuring stable performance. it can.

In addition to the first aspect of the present invention, the second aspect of the present invention is such that a convex portion is provided so as to surround the inlet side of the throttle means on the high pressure side. Normally, a narrow tube having a small inner diameter is used as the throttle means to form a narrow passage,
When small foreign matters such as contaminants in the compressor or the refrigeration cycle accompany the lubricating oil, the function of the throttle means may be impaired by clogging. If that happens, the oil seal of the compression chamber will not work, and leakage of refrigerant gas will occur,
Compressor performance deteriorates and becomes unstable. According to the configuration of the present invention, the inlet on the high pressure side of the throttle means is provided on the inner periphery of the slewing bearing portion, and the periphery of the inlet is raised to form a convex shape so that foreign matters such as contaminants accompanying the lubricating oil are rotated by the crankshaft. It is possible to prevent the invasion into the throttle means by driving the outer peripheral portion from the inlet by the centrifugal force due to. This makes it possible to prevent performance deterioration and instability.

In addition to the first invention, the third invention of the present application is such that a cylindrical tube is arranged at the inlet on the high pressure side of the throttle means, and the cylindrical tube is projected inward in the radial direction. As a result, like the second aspect of the invention, foreign matter such as contaminants accompanying the lubricating oil can be driven to the outer peripheral portion from the inlet by the centrifugal force due to the rotation of the crankshaft, and can be prevented from entering the throttle means. This makes it possible to prevent performance deterioration and instability.

[0016]

SUMMARY OF THE INVENTION In order to solve the above problems, the present invention rotatably supports an eccentric shaft portion provided at the end of a crankshaft by a slewing bearing housed in a slewing bearing housing portion on the back surface of a slewing scroll end plate, The main bearing provided on the frame has a structure in which the middle portion of the crankshaft is rotatably supported, and at the same time, an oil passage having a throttle means for communicating the high-pressure space and the low-pressure space is used to make the high-pressure side inlet the innermost wall surface of the slewing bearing housing. It is provided inside the orbiting scroll end plate so as to open at the back.
As a result, the outer diameters of the swivel shaft and the main shaft can be minimized to reduce mechanical loss.At the same time, the inlet opening of the oil passage is installed in a place where the lubricating oil is pushed away by centrifugal force, so that the pump can be operated at a low speed. The lubricating oil can be reliably supplied even if the amount of oil supply decreases.

Further, according to the present invention, by providing the convex portion so as to surround the oil passage inlet opening, fine foreign matter is mixed with the lubricating oil and sucked into the oil passage, and the throttle means is clogged to block the oil passage. Is to prevent.

(Embodiment 1) Hereinafter, a hermetic scroll compressor according to an embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view showing a hermetic scroll compressor according to a first embodiment of the present invention. In FIG. 1, reference numeral 1 is a closed container, and a frame 5 is fixed by welding shrink fitting or the like. The orbiting scroll 7 that meshes with the fixed scroll 6 is sandwiched between the frame 5 and the fixed scroll 6 to form the scroll compression mechanism 2. Between the orbiting scroll 7 and the frame 5, there is provided a rotation preventing mechanism 8 such as an Oldham ring that prevents the orbiting scroll 7 from rotating and guides it to make a circular orbital motion. The orbiting shaft 4a at the upper end of the crankshaft 4 is slidably engaged with the orbiting bearing 32 housed in the orbiting bearing housing provided in the orbiting scroll 7.

When the crankshaft 4 is rotated in this state, the orbiting scroll 7 makes a circular orbital motion, whereby the compression chamber 9 formed between the fixed scroll 6 and the orbiting scroll 7 moves from the outer peripheral side to the central portion. While reducing the volume. Utilizing this, the refrigerant gas is sucked and compressed from the suction pipe 10 communicating with the outside of the closed container 1 through the suction port 11, and the refrigerant gas having a predetermined pressure or more is discharged at the central portion of the fixed scroll 6. The reed valve 13 is pushed open from 12 and discharged into the container discharge chamber 20 is repeated.

The lower end of the crankshaft 4 reaches the oil sump 14 at the lower part of the closed container 1 and is rotatably supported by an auxiliary bearing member 15 fixed by welding or shrink fitting in the closed container 1 for stable rotation. You can The electric motor 3 is located between the frame 5 and the sub-bearing member 15, and is integrally joined to the outer periphery of the middle portion of the crankshaft 4 and the stator 3a fixed to the closed container 1 by welding or shrink fitting. Rotor 3b
And balance weights 17a and 17b fixed by pins 16 are provided on the upper and lower end surfaces of the rotor 3b, whereby the rotor 3b and the crankshaft 4 rotate stably, and the orbiting scroll 7 stabilizes. It can be moved in a circular orbit.

The oil supply mechanism is composed of a pump 18 driven at the lower end of the crankshaft 4, and the lubricating oil in the oil sump 14 is passed through the crankshaft 4 through an oil hole 19 which extends vertically.
Is supplied to the slewing bearing portion space 33 through. The supplied lubricating oil is divided into two systems, one system lubricates the slewing bearing 32 and the slewing shaft 4a, lubricates the main shaft portion 4b and the main bearing 5a, and then drips under the frame 5 to finally obtain the oil. Collected in the pool 14.

Next, another system will be described. A back pressure chamber 34 is formed on the outer peripheral portion of the orbiting scroll 7 by the fixed scroll 6 and the frame 5, and the back pressure chamber 34 communicates with the suction portion. Further, the back pressure chamber 34 and the slewing bearing portion space 33
And the oil passage 35 communicating with the end plate 7 of the orbiting scroll 7.
It is provided in b, the throttling means 36 is arranged there, and the oil passage 35
Is opened in the inner circumference of the slewing bearing space 33 so as to face the vicinity of the end of the slewing shaft 4a. End plate 7 of orbiting scroll 7
The frame 5 side of b is a seal member 38 arranged on the frame 5.
The inside is a discharge pressure (high pressure) and the outside is a back pressure chamber 34, which is a suction pressure (low pressure). The lubricating oil supplied to the slewing bearing portion space 33 is supplied to the oil passage 3 due to the differential pressure.
5 is guided to the back pressure chamber 34 through the throttle means 36. The lubricating oil guided to the back pressure chamber 34 is sucked into the compression chamber 9 from the suction portion, and is discharged from the discharge port 12 to the in-container discharge chamber 20 together with the refrigerant gas.

The refrigerant gas discharged into the in-container discharge chamber 20 is partitioned by a compression mechanism communication passage 21 that connects the in-container discharge chamber 20 and the lower portion of the compression mechanism 2 with a passage cover 30 from the compression mechanism communication passage 21. A separating plate provided under the rotor 3b, passing through a communication passage 23 continuing to the rotor upper chamber 22 and a rotor passage 25 provided in the rotor 3b so that the rotor upper chamber 22 and the rotor lower chamber 24 communicate with each other. Crashed at 31,
The rotor 3b is rotated and urged to collide with the inner circumference of the stator 3a.

By thus restraining and handling the refrigerant gas discharged from the compression mechanism 2, even if the refrigerant gas discharged from the compression mechanism 2 comes into contact with the lubricating oil in the middle of the path and accompanies it. The gas-liquid separation is performed by the collision of the separation plate 31 with the inner circumference of the stator 3a, and the lubricating oil that accompanies the refrigerant gas can be efficiently separated and collected in the oil sump 14.

The gas-liquid separated refrigerant gas reaches below the electric motor 3 and is provided between the stator 3a or between the stator 3a and the hermetically sealed container 1 so that the lower part and the upper part of the stator 3a communicate with each other. The passage cover 30 passes through the stator passage 26.
After exiting to the stator upper chamber 27 on the outer circumference, the compression mechanism upper chamber 2
9 and the stator upper chamber 27 are communicated with each other through a compression mechanism 2 or a compression mechanism ascending communication passage (not shown) provided between the compression mechanism 2 and the closed container 1 so as to communicate with each other. Then, it is discharged from the discharge pipe 28 to the outside of the closed container.

(Second Embodiment) Next, a second embodiment will be described. The basic configuration of the second embodiment is the same as that of the first embodiment.
Only parts different from the embodiment will be described. Figure 2
FIG. 7 is an enlarged partial cross-sectional view around a slewing bearing portion in the second embodiment. In FIG. 2, 33 is a slewing bearing portion space, and 35 is an oil passage communicating with the back pressure space 34 of FIG. 1 and opening to the slewing bearing space 33. The periphery of the opening of the oil passage 35 is raised in a convex shape. The lubricating oil supplied to the slewing bearing portion space 33 is subjected to centrifugal force by the rotation of the slewing shaft 4a, and is brought to the outer peripheral side of the slewing bearing portion space 33. If foreign matter such as contamination is mixed in the supplied lubricating oil,
The foreign matter is attracted to the outermost circumference of the slewing bearing portion space 33 by the centrifugal force, and particularly stays at the root of the convex portion formed around the inlet side opening of the oil passage 35, and the foreign matter enters the oil passage 35. Instead, only the lubricating oil will be inhaled.

(Third Embodiment) Next, a third embodiment will be described. The basic configuration of the third embodiment is the same as that of the first embodiment.
Only parts different from the embodiment will be described. Figure 3
FIG. 8 is an enlarged partial cross-sectional view around a slewing bearing portion in the third embodiment. The cylindrical pipe 37 is arranged at the inlet of the oil passage 35 that communicates with the orbiting bearing space 33 in the radial direction.
Are projected inward in the radial direction. The lubricating oil supplied to the slewing bearing portion space 33 is subjected to centrifugal force by the rotation of the slewing shaft 4a, and is brought to the outer peripheral side of the slewing bearing portion space 33. When foreign matter such as contamination is mixed in the supplied lubricating oil, the foreign matter is rotated by the centrifugal force into the slewing bearing space 33.
Since it is moved to the outermost circumference, foreign matter cannot enter the inlet of the cylindrical tube 37, and only oil is sucked.

(Fourth Embodiment) Next, a fourth embodiment will be described. The basic configuration of the fourth embodiment is the same as that of the first embodiment.
Only parts different from the embodiment will be described. Figure 4
[Fig. 6] is an enlarged view of a partial cross-section around a slewing bearing portion in the fourth embodiment. FIG. 5 is an enlarged view of a partial vertical section thereof.
The inlet of the oil passage 35 communicating with the orbiting bearing space 33 is provided in the axial direction of the end plate 7b of the orbiting scroll 7 and faces the center of the tip of the orbiting shaft 4a. As a result, even if foreign matter such as contaminants is mixed in the lubricating oil supplied to the slewing bearing portion space 33, the foreign matter is centrifugally caused by the foreign matter.
Since it is moved to the outermost periphery, foreign matter does not enter the oil passage 35, and only the lubricating oil is sucked.

[0030]

According to the present invention, as is apparent from the above description, the crankshaft is composed of the orbiting shaft and the main shaft, the orbiting scroll is provided with the orbiting bearings, and the orbiting shafts are fitted to each other. The diameter can be reduced, the mechanical loss of each can be significantly reduced, and a highly efficient compressor can be provided. Moreover, by supplying the seal oil to the compression chamber, the communication hole of the throttle means is opened to the inner peripheral side of the slewing bearing, so that the oil can be stably and reliably supplied regardless of the operating speed, and the performance can be secured and stabilized.

Even if foreign matter such as contamination is mixed in the supplied lubricating oil, the foreign matter does not interrupt the supply of the seal oil, and stable performance can be secured.

[Brief description of drawings]

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

FIG. 2 is an enlarged partial cross-sectional view around a slewing bearing portion according to a second embodiment of the present invention.

FIG. 3 is an enlarged partial cross-sectional view around a slewing bearing portion according to a third embodiment of the present invention.

FIG. 4 is an enlarged partial cross-sectional view around a slewing bearing portion according to a fourth embodiment of the present invention.

5 is an enlarged view of a partial vertical cross section of FIG.

FIG. 6 is a vertical sectional view showing a conventional hermetic scroll compressor.

[Explanation of symbols]

1 closed container 2 compression mechanism 3 electric motor 3b rotor 3a Stator 4 crankshaft 4a Eccentric shaft 5 frames 6 fixed scroll 7 orbiting scroll 8 Rotation prevention mechanism 9 compression chamber 10 Inhalation pipe 11 suction port 12 outlets 13 reed valve 14 oil sump 15 Secondary bearing member 16 pin 25 rotor passage 32 slewing bearing 33 Slewing bearing space 34 Back pressure chamber 35 communication hole 36 Aperture means 37 Cylindrical tube

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 3H029 AA02 AA14 AB03 BB06 BB36                       BB42 CC05 CC06 CC16 CC17                       CC23 CC34 CC45                 3H039 AA03 AA12 BB11 BB16 BB28                       CC02 CC08 CC10 CC19 CC27                       CC44

Claims (4)

[Claims] 1. A compression mechanism, an electric motor, and an oil sump are arranged in a closed container, and the compression mechanism includes a fixed scroll having a spiral wrap formed on a mirror plate, and the fixed scroll wrap on one side of the mirror plate. An orbiting scroll in which spiral wraps that face each other are provided with an orbiting bearing portion on the other side, and an orbiting shaft that slidably engages with the orbiting bearing portion and drives the orbiting scroll has one end portion. At the same time, the crank having an oil hole inside which communicates between the other end located inside the oil sump and the swivel shaft side end to supply the oil in the oil sump to the swivel shaft side end. A shaft, a frame that has a main bearing portion that pivotally supports the crankshaft, and that slidably holds the orbiting scroll between the fixed scroll, and a high pressure portion in a space of the orbiting bearing portion of the orbiting scroll end plate. And in the low pressure section A hermetic scroll compressor comprising partitioning means for cutting and an oil passage for supplying oil supplied to the high pressure portion space to the low pressure portion space via a throttle means, wherein the oil passage and the throttle means are orbiting scroll end plates. A hermetic scroll compressor, characterized in that the high pressure side inlet of the oil passage is arranged so as to face the vicinity of the end of the orbiting shaft and open to the inner peripheral side of the orbiting bearing. 2. The hermetic scroll compressor according to claim 1, wherein a convex portion protruding inward in the radial direction is provided so as to surround the high pressure side opening of the oil passage. 3. The hermetic scroll compressor according to claim 1, wherein a cylindrical pipe is arranged at the high pressure side inlet of the oil passage, and the cylindrical pipe is projected inward in the radial direction. 4. A compression mechanism section, an electric motor, and an oil sump are arranged in a closed container, and the compression mechanism section includes a fixed scroll having a spiral wrap formed on an end plate, and the fixed scroll wrap on one side of the end plate. When a spiral wrap that is opposed to and meshes with each other is formed on one end of an orbiting scroll having an orbiting bearing portion on the other side, and an orbiting shaft that fits into the orbiting bearing portion and drives the orbiting scroll. At the same time, a crankshaft having an oil hole therein for communicating the other end arranged inside the oil sump and the turning shaft side end to supply the oil of the oil sump to the turning shaft side end, A frame that has a main bearing portion that pivotally supports the crankshaft, and that slidably holds the orbiting scroll between the fixed scroll and a space of the orbiting bearing portion of the orbiting scroll end plate for a high pressure portion and a low pressure portion. Partition into A hermetic scroll compressor comprising a cutting means and an oil passage for supplying the oil supplied to the high pressure portion to the low pressure portion via the throttling means, wherein the oil passage and the throttling means are provided in an orbiting scroll end plate. A hermetic scroll compressor, wherein the high pressure side inlet of the oil passage is arranged so as to open on a scroll end plate surface facing the center of the end surface of the orbiting shaft.