JPH06307358A - Scroll compressor - Google Patents

Abstract

PURPOSE:To secure the stable oil supply to a compression chamber when a compressor is in operation and check the oil from flowing in excessively at the time it is at a standstill by installing revolving spiral vanes downstream of a hydraulic pump, and furnishing each vane with an injection path having a throttle device. CONSTITUTION:A compression mechanism 2 and the stator 4 of a motor 3 to drive it are accommodated in a sealed vessel 1, and a crank shaft, 6 to drive this compression mechanism 2 is coupled with the rotor 5 of a motor 3. The compression mechanism 2 includes, among others, stationary spiral vane components 10 in which stationary spiral vanes 9 are formed on a stationary end plate 9 and revolving spiral vane components 13 where revolving spiral vanes 11 are formed on a revolving end plate 12 which are engaged by the stationary spiral wane springs 9 to partition a plurality of compression chambers 14. The oil supplied forcedly by a pump 42 from an oil sump 7 is introduced to a throttle device 40 furnished on the revolving spiral vane components 13 through an oil supply path 43 provided in a crank shaft 6. Then the oil adjusted to a proper amount is supplied to the compression chambers 14 from an injection port via an introducing path 41.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in an air conditioner or the like.

[0002]

2. Description of the Related Art When a gas is compressed by a scroll compressor, it is necessary to make the dimensional accuracy of the spiral portion extremely high in order to reduce the leakage gap of the compression portion.
Due to variations in dimensional accuracy, there is a problem that the cost of the scroll compressor is high and the variations in performance are large.

Therefore, as a measure for solving this kind of problem,
In order to prevent gas leakage during compression, various configurations have been filed that aim to optimize the dimensional accuracy of the spiral portion and stabilize the compressor performance by the sealing effect using a lubricating oil film.

FIG. 4 shows an electric motor 7 in the upper part of a closed container 701.
03 is placed and the compression unit is placed in the lower part, and the space 7 in the closed container
02 is a discharge chamber, and the lubricating oil in the oil reservoir 710 at the bottom of the discharge chamber is directly introduced into the compression chamber 723 in the middle of compression through the oil suction pipe 722 (Japanese Patent Laid-Open No. 57-83).
No. 86), FIG. 5 shows a structure in which a compression part is arranged in the upper part of a closed container 801, an electric motor 803 is arranged in the lower part, and a space 802 inside the closed container is used as a discharge chamber.
The back pressure chamber 808 in the intermediate pressure state, which is provided on the rear surface of the swirling spiral blade component 804 on the side opposite to the compression chamber in order to reduce the thrust force acting on the gas compression, the oil supply inside the drive shaft 806 is provided before and after the relay. The lubricating oil in the oil reservoir 809 at the bottom of the closed container 801 is introduced into the compression chamber 823 during compression by a differential pressure through the hole 899 and the oil supply pipe 815 (Japanese Patent Laid-Open No. 59-110893).

[0005]

However, the structure in which the lubricating oil in the oil reservoir 710 at the bottom of the space 702 in the closed container, which has the same discharge pressure as that shown in FIG. 4, is caused to flow into the compression chamber 723 during compression by a differential pressure. Then, when used in a refrigerant compressor or the like, a large amount of refrigerant returned from the refrigeration cycle outside the compressor to the inside of the compressor due to its own weight or differential pressure while the compression is stopped is liquefied and the lower surface of the electric motor 703 above the oil sump 710 is liquefied. In some cases, the refrigerant liquid or lubricating oil may flow into the compression chamber 723 through the oil suction pipe 722 and fill up, and restart operation cannot be performed because the compression load is excessive in such a state. Even if it can be restarted due to the large starting torque, it will damage the compressor.

Further, depending on the operating conditions of the compressor, the oil sump 710
There is also a case where the lubricating oil is insufficient, and in such a state, there is a problem that the compressed gas flows into the compression chamber and the compression efficiency is remarkably lowered, and the compressor is damaged due to the abnormal pressure rise in the compression chamber.

Further, in the structure shown in FIG. 5, in which the lubricating oil is supplied to the compression chamber 823 in the middle of compression via the back pressure chamber 808 in the intermediate pressure state communicating with the oil reservoir 809 at the bottom of the compressor, Similar to the case of FIG. 4, when there is a shortage of lubricating oil in the oil reservoir 809, there is a problem that the compression efficiency is significantly reduced and the durability is reduced.

Therefore, the present invention provides a scroll compressor having a structure that stably supplies oil to the compression chamber during operation of the compressor and prevents excessive inflow of oil when stopped.

[0009]

In order to solve the above-mentioned problems, a scroll compressor according to the present invention has an electric motor and a compression mechanism driven by the electric motor inside a hermetically sealed container, and fixes the compression mechanism. A fixed spiral vane component in which a fixed spiral vane is formed on an end plate, and a swirl spiral vane component in which a swirl spiral vane meshing with the fixed spiral vane to form a plurality of compression working spaces is formed on a swirl end plate, and the swirl A rotation restraint component that prevents the spiral vane component from rotating and only rotates, a crankshaft that pivotally drives the spiral vane component, a bearing component that has a main bearing that supports the spindle formed on the crankshaft, and a discharge space. And a pump that supplies oil from a communicating space to an oil supply path penetrating the inside of the main shaft, and discharges gas discharged from the compression mechanism to a space including the crankshaft and the electric motor. A swivel drive engagement portion that engages an eccentric drive engagement portion provided on the crankshaft to drive the swirl spiral blade component to swivel is provided on a rear surface of the swivel mirror plate opposite to the swirl spiral blade, and A sliding partition ring for partitioning the gas pressure applied to the rear side of the end plate to the outside of the swivel drive engagement part on the rear side of the end plate into a discharge pressure applied to the central part and a pressure lower than the discharge pressure applied to the outer periphery of the end face of the end plate. Is provided, and an oil supply passage having a throttle device that communicates the rear high-pressure chamber formed inside this with the compression chamber is provided in the swirling spiral vane component, and the oil supplied from the pump can be injected into the compression chamber. It is configured.

[0010]

The function of the present invention is as follows.
An appropriate amount of oil for sealing the compression chamber with an oil film can be stably supplied from the oil pump during operation of the compressor, and excessive inflow of oil can be prevented during stop.

[0011]

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

FIG. 1 is a vertical sectional view of an embodiment of a scroll compressor of the present invention, and FIGS. 2 and 3 are enlarged sectional views of a compression mechanism portion.

The compression mechanism 2 and the stator 4 of the electric motor 3 for driving the compression mechanism 2 are fixed inside the closed container 1, and the rotor 5 of the electric motor 3 is connected to the crankshaft 6 for driving the compression mechanism 2 to form the closed container 1 The periphery of the compression mechanism 2 is used as an oil sump 7. Compression mechanism 2
Is a fixed spiral vane component 10 made of cast iron having a fixed spiral vane 9 integrally formed with the fixed end plate 8, and a movable seal member at the tip of the vane that meshes with the fixed spiral vane 9 to form a plurality of compression chambers 14. A swirling spiral blade component 13 having a swirling spiral blade 11 having 44 formed on the swirl end plate 12 and made of aluminum or resin, and this swirling spiral blade component 13
Rotation restraint parts 15 that prevent rotation of the vehicle and only turn
A swivel drive shaft 16 provided on the opposite side of the swirl spiral blade 11 of the swirl end plate 12, an eccentric bearing 7 provided inside the main shaft 18 of the crankshaft 6 and into which the swivel drive shaft 16 is fitted; A bearing component 21 having a main bearing 19 for supporting the main shaft 18 of the shaft 6 and a rear end plate 20 of the rear end of the swivel end plate 12.
This swirl blade component 1
A plane plate part 24 having an axial movement limiting flat surface 23 for limiting the axial movement of 3 is arranged. This flat plate component 24
Further, a sliding partition ring 25 is provided to partition the gas pressure applied to the rear surface 20 of the mirror plate into a discharge pressure applied to the central portion and a pressure lower than the discharge pressure applied to the outer periphery of the rear surface 20 of the mirror plate. The refrigerant gas sucked from the suction pipe 30 of the compressor enters the compression mechanism 2 from the suction port 32 of the compression mechanism 2, is compressed in the compression chamber 14,
From the discharge port 33, it is discharged to the discharge chamber 37 between the electric motor 3 and the compression mechanism 2 through the discharge chamber 34, the discharge passage 35 provided on the outer periphery of the fixed mirror plate 8, and the discharge passage 36 provided in the bearing component 21. The discharged refrigerant gas passes through the electric motor peripheral passage 38,
It is guided from the discharge pipe 39 to the outside of the compressor.

On the other hand, the oil forcibly supplied by the pump 42 from the oil sump 7 is attached to the shaft of the swirling spiral blade part 13 via the oil supply passage 43 provided in the drive shaft 6.
Enter 0. The oil adjusted to an appropriate amount by the expansion device 40 is supplied to the compression chamber 14 through the injection passage 41 and the injection port.

With the above structure, an appropriate amount of oil for sealing the compression chamber with the oil film can be stably supplied from the oil pump during operation of the compressor, and the dimensional accuracy of the spiral portion can be optimized and the compressor performance can be improved. It is possible to realize high efficiency of the scroll compressor. Further, when stopped, the oil pump and the expansion device can be prevented from flowing into the compression chamber due to the differential pressure by using a resistance, and a restart-disabled state due to an excessive compression load can be avoided.

Further, at the time of high speed operation, the fixed spiral blade component and the swirl spiral blade component are made of different materials, so the gap between both blades increases due to the difference in thermal expansion coefficient.
A low noise and high performance scroll compressor can be realized without impairing the sealing performance.

Furthermore, a high-performance scroll compressor can be realized by improving the sealing performance of the movable seal member that follows the increase in the axial clearance due to the vertical deviation when the orbiting spiral blade component is rotated.

[0018]

The effect of the present invention is to provide a fixed spiral blade in which an electric motor and a compression mechanism driven by the electric motor are arranged inside a closed container, and the compression mechanism is formed with fixed spiral blades on a fixed end plate. A swirling spiral vane component in which a swirl swirl vane that forms a plurality of compression chambers and meshes with the fixed swirl vane is formed on a swirling end plate, and a self-rotating device that prevents the swirl swirl vane component from rotating and only rotates. A restraint part, a crankshaft that swivels the spiral blade part, and a bearing part having a main bearing that supports a main shaft formed on the crankshaft and a space communicating with the discharge space, and supplies oil to a lubrication path that penetrates through the main shaft. And a pump for supplying the gas discharged from the compression mechanism to the space including the crankshaft and the electric motor, and the gas is discharged to the space including the crankshaft and the electric motor. A swivel drive engagement portion that engages with an eccentric drive engagement portion provided on the crank shaft to drive the swirl spiral blade component to swivel is provided, and the end face of the swivel drive engaging portion on the rear face of the end face is outside the end face of the swivel drive member. The gas pressure applied to, a sliding partition ring for partitioning the discharge pressure applied to the central portion and a pressure lower than the discharge pressure applied to the outer periphery of the end face of the end plate is provided, and a back high-pressure chamber formed inside this, An oil supply passage having a throttle device that communicates with the compression chamber is provided in the swirling spiral vane component, and the oil supplied from the pump is injected into the compression chamber to seal the compression chamber with an oil film during operation of the compressor. An appropriate amount of oil can be supplied from the oil pump, and the dimensional accuracy of the spiral portion can be optimized and the compressor performance can be improved. Further, when stopped, the oil pump and the expansion device can be prevented from flowing into the compression chamber due to the differential pressure by using a resistance, and a restart-disabled state due to an excessive compression load can be avoided.

The effect of claim 2 of the present invention is a low-noise and high-performance scroll compressor even when the fixed spiral vane component and the swirl spiral vane component, which must be used at high speed, are made of different metals. Can be realized.

The effect according to claim 3 of the present invention is to improve the sealing performance of the movable seal member that follows the increase in the axial clearance due to the axial deviation of the orbiting spiral vane component during orbiting, thereby improving the performance of the scroll. It is possible to realize a compressor.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of an embodiment of a scroll compressor of the present invention.

FIG. 2 is an enlarged vertical sectional view of the compression mechanism section.

FIG. 3 is an enlarged cross-sectional view of the compression mechanism section.

FIG. 4 is a vertical sectional view of a conventional scroll compressor.

FIG. 5 is a vertical sectional view of another conventional scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compressor 3 Electric motor 6 Crankshaft 8 Fixed end plate 9 Fixed spiral blade 10 Fixed spiral blade part 11 Swirling spiral blade 12 Swirling end plate 13 Swirling blade part 14 Compression chamber 15 Spinning restraint part 18 Spindle 19 Main bearing 20 Back of swivel mirror plate 21 Bearing parts 25 Sliding partition ring 40 Throttling device 41 Introduction path 42 Oil supply pump 43 Oil supply path 44 Movable seal member 45 Injection hole

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shozo Hase 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A fixed spiral vane component in which an electric motor and a compression mechanism driven by the electric motor are disposed inside a closed container, and the compression mechanism is a fixed scroll vane component in which fixed spiral vanes are formed on a fixed end plate, and the fixed scroll. A swirling spiral vane component in which swirling swirl vanes that mesh with the vanes and form a plurality of compression chambers are formed on a swirling end plate; a rotation restraining component that prevents the swirling spiral vane component from rotating and only allows swirling; It includes a crankshaft for driving the blade parts to rotate, a bearing part having a main bearing for supporting the main shaft formed on the crankshaft, and a pump for supplying oil from a space communicating with the discharge space to an oil supply path penetrating the inside of the main shaft. The discharge gas of the compression mechanism is discharged into a space including the crankshaft and the electric motor, and a bias provided on the crankshaft is provided on a rear surface of the swirl end plate opposite to the swirl spiral blade. A swivel drive engagement portion that engages the drive engagement portion to swivel the swirl vane component is provided, and the gas pressure applied to the rear surface of the end plate is centered outside the swivel drive engagement portion on the back surface of the end plate. A sliding partition ring for partitioning the discharge pressure applied to the portion and the pressure lower than the discharge pressure applied to the outer periphery of the end face of the end plate is provided, and the rear high-pressure chamber formed inside this is connected to the compression chamber. A scroll compressor in which an oil supply passage having a device is provided in the orbiting spiral vane component, and oil supplied from the pump is injected into a compression chamber. 2. The scroll compressor according to claim 1, wherein the orbiting spiral blade component is made of a material different from that of the fixed spiral blade component. 3. The scroll compressor according to claim 1, further comprising a swirling spiral vane component having a movable seal member at a tip portion of the swirling spiral vane.