JPS62147081A - Enclosed motor-driven compressor - Google Patents

Abstract

PURPOSE:To improve the lubricating performance of an enclosed rotary compressor by forming a crank shaft into a hollow body while providing a threaded groove on the inner periphery on the lower part of said hollow body which is immersed in an oil sump. CONSTITUTION:A hollow part 3 is formed inside a crankshaft 3 for connecting an electric equipment part 11 to a compressor mechanism part 2 in an enclosed rotary compressor, while a threaded groove 3b in the same direction as the rotating direction of the crankshaft 3, is formed on the inner periphery of the lower end part of the hollow part 3a which is immersed in an oil sump. Thereby, a lubricating oil 10 stored in the lower part of an enclosed container 1 is pumped up by a centrifugal force due to the threaded groove 3b, and efficiently introduced to the upper part of the hollow part 3a of the crankshaft 3, securely lubricating sliding parts.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to a hermetic electric compressor having three mechanical parts for rotational pressure.

BACKGROUND ART Conventionally, this type of compressor structure has a crankshaft a, a piston b, which are rotational compression mechanism parts, as shown in FIGS. 4 and 5.
The crankshaft a is supported by a sill d which houses a partition vane C, and a discharge valve and a stone bar are respectively mounted on the upper or F part bearing end plate e provided so as to close the compression space in the sill d. The muffler discharge amount is set at the upper or lower bearing end plate eV so as to cover these bearing end plates.
The crankshaft a has a hollow structure, and an oil vane g and an oil stopper are provided below the hollow part.

Then, as the crankshaft a rotates, the lubricating oil 1 sealed in the lower part of the airtight container is guided through the oil introduction hole provided in the oil stopper to the oil vane g, and is introduced into the hollow of the crankshaft a. The lubricating oil was raised upwards and was supplied between the compression mechanism parts through an oil drain 6k provided on each crankshaft (a).

Problems to be Solved by the Invention However, in the above configuration, when the rotation speed of the compressor is low, only the lubricating oil along the oil vanes g is guided above the hollow part of the crankshaft a. The centrifugal force acting on the oil vane g is small because the distance from the center of the rotating shaft of the crankshaft a is short.
Unable to efficiently supply lubricating oil to the parts in the pressure introduction 1 mechanism,
Particularly in the low speed range of the compressor, sufficient lubrication cannot be achieved, resulting in problems such as decreased performance and shortened lifespan.

The present invention provides a compressor structure that eliminates the disadvantages of the conventional compressor at low rotation speeds and makes it possible to improve the performance and reliability of the compressor, such as its life.

Means for Solving the Problems In order to solve the drawbacks seen in the above-mentioned conventional example, the present invention forms a thread groove in the inner periphery of the lower part of the hollow part of the crankshaft in the same direction as the rotational direction of the crankshaft. It has a structure in which the shaft operates as a screw pump.

Operation With the above configuration, the compressor of the present invention has a thread groove formed in the hollow portion of the crankshaft in the same direction as the rotational direction of the crankshaft, so that as the crankshaft rotates, oil flows from the oil inlet hole of the oil plug. The incoming lubricating oil is guided to the crankshaft thread, and centrifugal force guides the lubricating oil in the direction of the winding of the thread, so the lubricating oil is guided to the upper part of the crankshaft very efficiently.

Therefore, even in the low rotation range of the compressor, lubricating oil can be sufficiently supplied between the horizontal parts of the compressor 1a.

EXAMPLE Hereinafter, an example of the present invention will be described with reference to FIGS. 1 to 3.

In the figure, reference numeral 1 denotes an airtight container of a hermetic electric compressor, and a crankshaft 3, which is a component of a compression mechanism part 2, is rotatably provided with a piston 4. , is supported by a lower bearing end plate 6 and rotatably housed in a cylinder 7 together with the piston 4. Further, the lower bearing end plate 6 is provided with a discharge bow 6a, and is also provided with a discharge valve (not shown) and a stopper (not shown), and the lower bearing end plate 6 is provided with a discharge valve (not shown) and a stopper (not shown). A discharge muffler 8 is provided.

In addition, a partition vane that partitions the compression space into a suction side and a compression side is slidably arranged in the cylinder 7, and a screw in the same direction as the rotational direction of the crankshaft 3 is installed on the inner periphery of the lower part of the hollow part 3a of the crankshaft 3. A groove 3b is formed. An oil inlet hole 9a is formed by an oil plug provided at the lower end of the l-t crankshaft.

The crankshaft 3 also has an oil drain hole 3c for guiding lubricating oil from the thread groove 3b of the crankshaft 3 to between the compression mechanism parts.
are provided at various locations.

Further, the sealed container 1 has a lubricating oil 10 sealed in its lower part, a motor section 11 disposed in its upper part, and a discharge pipe 1& and a suction pipe 1b.

In the above 1' configuration, when the electric motor section 11 is driven, the crankshaft 3 rotates and the piston 4 rolls within the cylinder 7, so that during the refrigeration cycle having a well-known structure, refrigerant is sucked through the suction port 1b,
Compressed and discharged in the compression mechanism section 2 as the process progresses,
It passes through the closed container 1a and is discharged into the refrigeration cycle again.

Further, as the crankshaft 3 rotates, the lubricating oil 1° sealed in the airtight container 1 passes through the oil introduction hole 9a provided in the oil plug 9 and is guided into the thread groove 3b of the crankshaft 3. . Since the direction of the thread groove 3b is formed in the same direction as the rotational direction of the crankshaft 3, the lubricating oil 10 is applied to the thread groove 3b along the crankshaft 3 by centrifugal force.
The lubricating oil is efficiently guided toward the upper part of the hollow part 3a, and is supplied into the compression space of the compression mechanism part 2 from the oil drain hole 3c provided in the crankshaft 3.

Therefore, in the wooden embodiment, a thread groove 3b is provided in the lower part of the hollow part 3a of the crankshaft 3, and the thread direction of the thread groove 3b is set in the same direction as the direction of rotation of the crankshaft 30. The guided lubricating oil 10 is guided along the thread groove 3b, and the lubricating oil is subjected to a large centrifugal force in the thread groove 3b, so that the lubricating oil is efficiently guided above the hollow portion 3a of the crankshaft 3. I can do it.

As shown in FIG. 3, in addition to the configuration of the above embodiment, the twisting direction of the oil vanes 12 is reversed to the rotating direction of the crankshaft 3, so that the lubricating oil along the oil vanes is transferred to the lower part of the hollow part of the crankshaft when the crankshaft rotates. By combining the configuration in which the lubricating oil falls in the opposite direction, it is possible to provide a substantially constant supply of lubricating oil from a low rotation range to a high rotation range.

Effects of the Invention As is clear from the above embodiments, the hermetic electric compressor of the present invention has a screw groove formed in the lower part of the hollow part of the crankshaft in the same direction as the rotational direction of the crankshaft, so that the compressor can be easily connected to the compression mechanism part. The lubricant supply can be efficiently performed, a sufficient supply of lubricating oil can be ensured when the compressor is mounted at low rotation speeds, and various advantages such as shortening the life of the EE compressor and preventing a drop in efficiency in the low rotation range can be obtained.

[Brief explanation of drawings]

FIG. 1 is a sectional side view of a hermetic electric compressor according to an embodiment of the present invention, and FIGS. 2 and 3 are exploded perspective views of the compression mechanism of the same compressor. 1... Airtight container, 2... EE compression mechanism section 3
・・・・・・Crankshaft, 3 &・・・・・・Hollow part, 3
b...Thread groove, 3c...Oil drain hole,
4...Piston, 5...Upper bearing end plate, 6...Lower bearing end plate, 7...Cylinder,
8...Discharge muffler, 9...Oil plug,
10...Lubricating oil, 11...Electric motor part,
12.--Oil blade. Name of agent: Patent attorney Hoo Nakao and 1 other person/-
---Tadakan Ansika? --- Melon cleaning 4 capitals 3 --- Crank 7th axis 3cL --- Middle 1st 7 --- Cylinder 7゛7 --- Oil switch J --- Crank talent Jb --- Ishia 2nd figure
7---Shirin 7゛7 ・-・Sai I 7 Shi Sai Gin J-・Kura/ri 1 thing 7・-1 oil pot/? ---Oil Feather Figure 4

Claims (1)

[Claims] An electric motor and a rotary compression mechanism driven by the electric motor are disposed inside a sealed container, supported by an upper bearing end plate and a lower bearing end plate of the compression mechanism, and an electric motor rotor is disposed in the upper part. A hermetic electric compressor, wherein the crankshaft is a hollow shaft, and a screw groove is formed on the inner periphery of the hollow portion at the bottom of the crankshaft.