JPH04140491A - Closed type electric motor-driven compressor - Google Patents

Abstract

PURPOSE:To facilitate assembly by forming an oil pickup part, built in a lower end side of a crankshaft to suck lubricating oil in the bottom part of a closed vessel, of superreinforced synthetic resin, and fixing the oil pickup part to partly bite in a recessed groove formed in the crankshaft. CONSTITUTION:In a closed type electric motor-driven compressor, this oil pickup part 57 is provided in a lower end part 53b in a crankshaft 53 of an electric motor element for driving a compression element in a closed vessel, and lubricating oil in the bottom part in the closed vessel is sucked, delivered and scattered from an upper end opening part of a crank pin by rotating the crankshaft 53. Here, the crankshaft 53 is formed of metal material, and on the other hand, the oil pickup part 57 is formed in a cap shape of, for instance, superreinforced synthetic resin, respectively, to make the oil pickup part 57 fittable to the periphery of the crankshaft 53 in an externally fitted condition. An annular recessed groove 62 is provided in the periphery of the crankshaft 53 corresponding to a fitting surface 61 of the oil pickup part 57, and a part 57a of the resin bites in this recessed groove 62 by utilizing after-shrinkage action by host carrier treatment of resin.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an improvement of a relatively small single-cylinder reciprocating hermetic electric compressor installed in, for example, a household refrigerator.

[Prior Art] Conventionally, this type of hermetic electric compressor is disclosed in Japanese Patent Publication No. 62-30311, which was previously filed and published by the present applicant.

As shown in Fig. 3, a compressor with such a conventional structure has the following features:
When the compressor main body 2 is installed in the airtight container 1, the compressor main body 2 is attached to the upper part of the support frame 3 made of metal such as casting, and the compressor element 4 is attached to the lower part of the support frame 3, and an electric motor for driving the compressor element 4 is attached to the lower part of the supporting frame 3. This is done by attaching the element 5 and elastically supporting it via a coil spring 6 in the closed container 1 whose inner bottom is filled with lubricating oil.

The electric element 5 includes a stator 51 around which a coil is wound, and a rotor 5 that rotates when the stator 51 is energized.
2, a crankshaft 53 fixed to the rotor 52 by being press-fitted or shrink-fitted therethrough, and the crankshaft 53
It consists of a crank pin 55 that projects through an eccentric member 54 that also serves as a balance weight and is formed at the upper end of the crankshaft.

The upper end portion 53a of the crankshaft 53 is slidably inserted into and held by a bearing portion 31 formed in the support frame 3.

On the other hand, the compression element 4 is a crank consisting of a cylinder 41, a piston 42 that reciprocates within the cylinder 41, and the piston 42 protruding from an eccentric member 54 formed at the upper end of the crankshaft 53. A connecting rod 43 is slidably connected to a pin 55, and the piston 42 includes:
It is capable of reciprocating sliding in the horizontal direction orthogonal to the axial direction of the crankshaft 53.

Further, the crankshaft 53 and crank pin 55 of the electric element 5 communicate with each other via a communication path 56.

As shown in FIG. 4, the oil pickup portion 57 is formed by forming the lower end portion 53b of the crankshaft 53 in a tapered manner so that the inner diameter opening surface thereof becomes an inverted conical tapered surface. There is.

That is, the oil pickup section 57 sucks the lubricating oil ○ sealed in the inner bottom of the closed container 1 by the rotation of the crankshaft 53, and transfers this lubricating oil ○ to the communicating path 56.
The stator 51 of the electric element 5 is discharged through the upper end opening 55a of the crank pin 55 and scattered.
The lubricating oil ○ is sprinkled on the upper part of the crankshaft 53 to improve the cooling effect of the electric element 5, and a part of the lubricating oil ○ flows into the spiral guide groove 58 formed on the outer periphery of the crankshaft 53. Then, the bearing portion 31 of the support frame 3
By supplying it to the inner diameter surface 31a of the crankshaft 53
It exhibits a pumping action that can lubricate the sliding parts of.

[Problem to be solved by the invention] However, in the compressor of the conventional structure described above,
Currently, the crankshaft 53 and the oil pickup portion 57 are integrally formed of a metal material such as casting.

Furthermore, conventionally, the crankshaft 53 and the oil pickup section 57
Although it has been proposed that the two parts are formed separately and screwed together, there is a problem in that it is troublesome to assemble them together.

[Object of the Invention] An object of the present invention is to provide a hermetic electric compressor in which an oil pickup section can be easily assembled to a crankshaft.

[Means to solve the problem] In order to solve the above-mentioned problems, this invention.

A compressor main body, which has a compression element attached to the upper part of a support frame made of metal such as casting, and an electric element for driving the compression element attached to the lower part thereof, is elastically supported in a closed container, and the electric element is driven by the compressor body. A crankshaft provided on the constituent rotor is slidably inserted into and held in the bearing portion of the support frame, and lubricating oil sealed in the inner bottom of the airtight container is placed on the lower end side of the crankshaft. In a single-cylinder reciprocating type hermetic electric compressor that is separately assembled with an oil pickup section that sucks oil, the crankshaft is formed of a metal material, and the oil pickup section is formed of a super-reinforced synthetic resin. This oil pickup part can be fitted onto the outer periphery of the crankshaft in an externally fitted state, and a groove is provided on the outer periphery of the crankshaft corresponding to the fitting surface of the oil pickup part, and a host is inserted into this groove. The structure is such that a part of the resin forming the oil pickup section is bitten into and fixed to each other by a post-shrinkage effect due to carrier treatment.

[Function] In other words, in the present invention, the crankshaft is formed of a metal material, the oil pickup portion is formed of a super-reinforced synthetic resin, and the oil pickup portion is fitted onto the outer periphery of the crankshaft in an externally fitted state. In addition to making it possible to
A concave groove is provided on the outer periphery of the crankshaft corresponding to the fitting surface of the oil pickup part, and a part of the resin forming the oil pickup part is bitten into this concave groove by post-shrinkage action due to host carrier treatment and fixed to each other. Therefore, the oil pickup section can be easily fixed to the crankshaft.

[Example] Hereinafter, the configuration of the present invention will be explained in detail based on the example shown in FIGS. 1 and 2. In the illustrated embodiment of the present invention, the same reference numerals are used for the parts having the same structure as those of the conventional hermetic electric compressor shown in FIG. 3, and the explanation thereof will be omitted.

That is, in the present invention, as shown in FIG. 1, the crankshaft 53 is made of a metal material, and the oil pickup portions 57 are made of, for example, a super-reinforced synthetic resin in a cap shape. It can be fitted onto the outer periphery of the shaft 53 in an externally fitted state.

Further, an annular groove 62 is provided in the circumferential direction on the outer periphery of the crankshaft 53 corresponding to the fitting surface 61 of the oil pickup portion 57, and the groove 62 has a shape as shown in FIG. By utilizing the post-shrinkage effect of the resin due to the host carrier treatment, a portion 57a of the resin forming the oil pickup portion 57 bites in and is fixed to each other.

By the way, the super-reinforced synthetic resin forming the oil pickup portion 57 mentioned above is, for example, polyimide-based synthetic resin as a matrix resin, glass fiber, carbon fiber,
In addition, by mixing reinforcing materials such as inorganic fillers, the heat resistant temperature is 150'C or higher.

Linear expansion coefficient is approximately 1.1X10-'/”C1 tensile strength is 5
It is a so-called "engineering plastic" which exhibits a weight of more than "kg/mm".

In the above embodiment, the concave groove 62 is continuously provided in an annular manner in the circumferential direction on the outer periphery of the crankshaft 53 corresponding to the fitting surface 61 of the oil pickup portion 57, but it is partially discontinuously provided. It may also be set in

The selection is arbitrary.

[Effects of the Invention] As is clear from the above description, the present invention is characterized in that the oil pickup portions are made of resin, and a portion of the resin bites into a groove formed in the crankshaft, thereby fixing them to each other. Therefore, it is possible to assemble the oil pickup portion to the crankshaft more easily than in the past.

[BRIEF DESCRIPTION OF THE DRAWINGS] Fig. 1 is an explanatory diagram of the main parts of an embodiment of the hermetic electric compressor according to the present invention, in which the oil pickup section is fixed to the crankshaft, and Fig. 2 is Fig. 1A. FIG. 3 is a schematic vertical sectional view showing a conventional hermetic electric compressor. 1 . . 3 . . 4 . . 52 . 53 . 57 . 61 . O. . . Sealed container, 2... Compressor main body, - Support frame, 31... Bearing section. -Compression element, 5...Electric element,...Rotor,...Crankshaft, 53b...Lower end,...Oil pickup section,...Fitting surface, 62...Concave groove. ·Lubricant.

Claims (1)

[Claims] (1) A compressor main body, which has a compression element attached to the upper part of a support frame made of metal such as casting, and an electric element for driving the compression element attached to the lower part thereof, is elastically supported in a closed container, and A crankshaft provided on a rotor constituting an electric element is slidably inserted into and held in the bearing portion of the support frame, and a lower end portion of the crankshaft is sealed in the inner bottom of the airtight container. In a single-cylinder reciprocating type hermetic electric compressor that is separately assembled with an oil pickup section that sucks lubricating oil, the crankshaft is formed of a metal material, and the oil pickup section is made of super-reinforced synthetic resin. The oil pickup portion is formed with a groove in the outer periphery of the crankshaft corresponding to the fitting surface of the oil pickup portion, and the oil pickup portion can be fitted onto the outer periphery of the crankshaft in an externally fitted state. 1. A hermetic electric compressor, characterized in that a part of the resin forming the oil pickup portion is bitten into the groove by a post-contraction effect due to host carrier treatment and fixed to each other.