JPH04140490A - Closed type electric motor-driven compressor - Google Patents

Abstract

PURPOSE:To reduce a noise and an input to a compressor by providing a bearing, consisting of superreinforced synthetic resin having a low coefficient of friction with a jaw part protrusively formed in the upper end periphery of a cylindrical body, in an upper side internal diametric surface in a bearing part of a supporting frame to an upper part of which a compression element is mounted. CONSTITUTION:In a closed type electric motor-driven compressor in which a compression element and an electric motor element 5 for driving the compression element are mounted respectively to upper and lower parts of a supporting frame 3 in a closed vessel, a bearing 32, consisting of superreinforced synthetic resin having a low coefficient of friction, is provided in an upper side internal diametric surface 31a in a bearing part 31 of the supporting frame 3 formed of metal of casting or the like. This bearing 32 is shaped in a form, in which a jaw part 34 is protrusively formed in the upper end periphery of a cylindrical body 33, and fixedly inserted to the upper side internal diametric surface 31a in the bearing part 31 of the supporting frame 3. Here, the jaw part 34 is stopped to an upper end stepped part 31d of a hole 31c step-formed in the upper side internal diametric surface 31a in the bearing part 31 of the supporting frame 3, and an upper end surface 34a of the jaw part 34 acts to serve as a sliding surface with a lower end surface 54a of an eccentric member 54.

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. 5, a compressor with such a conventional structure has a
When the compressor main body 2 is assembled into the closed container 1, the compressor main body 2 is attached with a compression element 4 on the upper part of a support frame 3 made of metal such as casting.

and an electrically powered element 115 below which drives the compression element 4.
This is done by attaching a holder and elastically supporting it via a coil spring 6 in a closed container 1 whose inner bottom part is filled with lubricating oil O.

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
The crankshaft 53 is configured with a crank bin 55 that projects through an eccentric member 54 that is formed at the upper end and also serves as a balance weight. Inner diameter surface 3 of bearing portion 31
It is inserted into 1a and held.

On the other hand, the compression element 4 includes a cylinder 41, a piston 42 that reciprocates within the cylinder 41, and the piston 4.
2 and a connecting rod 43 that connects to a crank pin 55 that protrudes from an eccentric member 54 formed at the upper end of the crankshaft 53, and the piston 42 extends in the axial direction of the crankshaft 53. It is possible to slide back and forth in the horizontal direction orthogonal to the horizontal direction.

Further, the crankshaft 53 of the electric element 5 and the crankbin 55 communicate with each other via a communication passage 56, and the lower end 53b of the crankshaft 53 is formed so that the inner diameter opening surface thereof becomes an inverted conical tapered surface. The oil pump portion 57 is formed by forming the portion tapered at the end.

That is, the oil pump section 57 sucks the lubricating oil 0 sealed in the inner bottom of the closed container 1 by the rotation of the crankshaft 53, and sends this lubricating oil 0 through the communication passage 56 to the upper end opening of the crank bin S5. By discharging it from the portion 55a and scattering it, it is sprinkled on the upper part of the stator 51 of the electric element 5, thereby improving the cooling effect of the electric IR 5, and a part of the lubricating oil 0 is distributed to the crankshaft. The sliding portion of the crankshaft 53 can be lubricated by supplying it to the inner diameter surface 31a of the bearing portion 31 of the support frame 3 so as to flow into the spiral guide #58 formed on the outer periphery of the shaft 53. This is how it is.

[Items to be addressed by the invention] However, in the compressor of the above-mentioned conventional structure,
As shown in FIG. 6, the support frame 3 to which the compression element 4 and the electric element 5 are attached is made of metal such as casting together with the bearing part 31, and the crankshaft 53 of the electric element 5,
Since the eccentric member 54 and the crank bin S5 are also integrally molded from metal such as casting, the upper end surface 31b of the bearing portion 31 of the support frame 3 and the lower end surface 54a of the eccentric member 54 integrally molded on the crankshaft 53. The load of the rotor 52 is applied between the sliding surfaces and the frictional resistance between those sliding surfaces increases.

Moreover, during operation, due to the inclination of the crankshaft 53 due to the reciprocating movement of the compression element 4 and the eccentric rotation of the crank bin 55,
The load in the thrust direction and radial direction is
This increases the load on the electric element S, which not only impedes noise reduction but also increases the compressor input and reduces power consumption. The problem was that it was not possible to expect a change.

[Object of the Invention] An object of the present invention is to provide a hermetic electric compressor that has low noise and can reduce input to electric elements during operation.

[Means for Solving the Problems] In order to solve the above-mentioned problems, the present invention includes a compression element attached to the upper part of a support frame made of metal such as casting,
A compressor body having an electric element for driving the compression element attached to the lower part of the compressor body is elastically supported in a closed container, and the upper end side of the crankshaft provided on the rotor constituting the electric element is connected to the compressor body. In the single-cylinder reciprocating hermetic electric compressor, the single-cylinder reciprocating type hermetic electric compressor is inserted into and held by a bearing portion integrally formed with a support frame, and the crankshaft is connected to and driven by the compression element via an eccentric member. A bearing made of super-reinforced synthetic resin having a low coefficient of friction is provided on the inner diameter surface of the upper side of the bearing part of the support frame, and the jaw part is formed protruding from the outer periphery of the upper end of the cylindrical body.

[Function] That is, the present invention provides a bearing made of super-reinforced synthetic resin having a low coefficient of friction and having a jaw portion protruding from the outer periphery of the upper end of a cylindrical body, on the inner diameter surface of the upper side of the bearing portion of the support frame. Therefore, the area of the thrust surface and radial surface can be increased, and the upper end surface of the bearing part of the support frame
The frictional resistance between the sliding surface and the lower end surface of the eccentric member integrally molded on the crankshaft is reduced.

In addition, during operation, the load in the thrust direction and radial direction applied to the upper corner edge of the bearing part of the support frame due to the tilting of the crankshaft due to the reciprocating motion of the compression element and the eccentric rotation of the crank pin is transferred to the upper end of the cylindrical body of the bearing. Since the load is received at the boundary between the outer circumferential side of the jaw protruding from the outer circumference and the lower surface thereof, the load is smaller than that of the conventional one, and noise and compressor input can be reduced.

[Embodiments] Hereinafter, the structure of the present invention will be explained in detail based on the embodiments shown in FIGS. 1 to 4. In the illustrated embodiment of the present invention, parts having the same structure as those of the conventional hermetic electric compressor shown in FIGS. 5 and 6 are designated by the same reference numerals.
The explanation will be omitted.

In other words, as shown in FIG. It has a structure in which a bearing 32 made of super reinforced synthetic resin having a low coefficient of friction is provided on the upper inner diameter surface 31a of the bearing part 31 of the support frame 3 made of metal such as.

The bearing 32 has a jaw 34 projecting from the outer periphery of the upper end of the cylindrical body 33, and as shown in FIG. When inserting and fixing, the cylindrical body 33
The outer diameter a of the support frame 3 is made equal to or slightly smaller than the inner diameter of the hole 31c formed stepwise on the upper inner diameter surface 31a of the bearing part 31 (a≦b), and the temperature during operation is In the high temperature atmosphere due to rising, the cylindrical body 3 after insertion
3 is the hole 31c of the bearing part 31 of the support frame 3.
It is made of a material having a coefficient of linear expansion larger than the inner diameter (a > b).

Further, as shown in FIG. 3, the bearing 32 has a jaw portion 34 formed on the cylindrical body 33 and a stepped hole 31c formed on the upper inner diameter surface 31a of the bearing portion 31 of the support frame 3.
It is engaged with the upper end stepped portion 31d so that its upper end surface 33a can protrude upward as a sliding surface with the lower end surface 54a of the eccentric member 54.

By the way, the super-reinforced synthetic resin that forms the bearing 32 mentioned above is made by using a polyimide-based synthetic resin as a matrix resin and mixing reinforcing materials such as glass fiber, carbon fiber, and other inorganic fillers with it to make it heat resistant. Temperature is 150"C or higher, linear expansion coefficient is approximately 1.1X
l0'/''C (in this case, 0.1 higher than the linear expansion coefficient of the material of the bearing part 31 of the support frame 3, which is the mating member)
These materials are called "engineering plastics" and have a compressive strength of 15 kg/ms" or more. By incorporating materials such as (trade name), it has the property of maintaining a coefficient of friction that is at least half as low as that of metal materials.

Therefore, the present invention provides a bearing 32 made of super-reinforced synthetic resin having a low coefficient of friction on the upper inner diameter surface 31a of the bearing portion 31 of the support frame 3, and also provides the bearing 32 at the upper end of the cylindrical body 33. Since the jaws 34 are formed protruding from the outer periphery, the jaws 34 of the cylindrical body 33 bear the entire load including the rotor 52, and the areas of the thrust surface and radial surface can be large.

Further, the upper end surface 33a of the cylindrical body 33 forming the bearing 32 is interposed as a sliding surface between the lower end surface 54a of the eccentric member 54 integrally molded on the crankshaft 53,
The frictional resistance between these sliding surfaces is reduced.

Furthermore, during operation, due to the inclination of the crankshaft 5 due to the reciprocating movement of the compression element 4 and the eccentric rotation of the rank pin 55,
The thrust direction and radial loads applied to the metal edge of the bearing part 31 of the support frame 3 are applied to the outer circumferential side surface 34 a3 and the lower surface of the jaw part 34 formed protrudingly on the upper end of the cylindrical body 33 of the bearing 32. In order to receive it at the boundary part 34b,
The load is smaller than the previous one, and noise and compressor drop can be reduced.6 Furthermore, the bearing 32 is inserted into the upper inner diameter surface 3Ia of the bearing portion 31 of the support frame 3 and fixed. At low temperature, the outer diameter a of the cylindrical body 33 is made equal to or slightly smaller than the inner diameter of the hole 31c formed in the upper part of the bearing part 31 of the support frame 3. Because it is made of a material that has a coefficient of linear expansion such that the outer diameter a of the cylindrical body 33 after insertion becomes larger than the inner diameter a of the hole 31c of the bearing part 31 of the support frame 3 in a high temperature atmosphere due to a temperature rise during , during operation, the bearing 32 is connected to the bearing part 31.
maintains a firm bond to the inner diameter surface 31a of the

In addition, in the above-mentioned embodiment, the stepped hole 31c formed in the inner diameter surface 31a of the first part side of the bearing part 31 of the support frame 3
Although the upper end surface 33a of the cylindrical body 33 forming the bearing 32 is provided in a protruding manner, another embodiment is shown in FIG.

While the upper end surface 33a of the cylindrical body 33 is flush with the upper end Wi31b of the bearing portion 31 of the support frame 3, the cylindrical body 3
The lower end surface 54 of the eccentric member 54 corresponding to the upper end surface 33a of 3
A may be provided with an annular protruding surface portion 54b to serve as a sliding surface.

[Effects of the Invention] As is clear from the above description, the present invention can reduce the load between the bearing part of the support frame and the crankshaft, thereby reducing noise and compressor input. In addition to being able to reduce the amount of power consumed, it is also possible to expect savings in power consumption.

[Brief explanation of the drawing]

FIG. 1 is an enlarged explanatory view of the main part of a state in which a crankshaft is inserted into a bearing portion of a support frame, showing an embodiment of a hermetic electric compressor according to the present invention, and FIGS. FIG. 4 is an explanatory diagram showing a state in which a bearing is inserted into a bearing part. FIG. 4 is an explanatory diagram showing another example of how a bearing is inserted into a bearing part of a support frame. FIG. FIG. FIG. 6 is an enlarged explanatory view of a main part showing a state in which a crankshaft is inserted into a bearing portion of a conventional support frame. 1 ・ ・ ・ 3 ・ ・ 31a ・ 33 ・ ・ 34 ・ 4 ・ ・ Airtight container, support frame, ...inner diameter surface, - cylindrical body, - jaw, compression element, 2... compressor main body, 31... Bearing portion, 32... Bearing, 33a... Upper end surface, 5...51...S3...55...6...Electric element. ...Stator, ...Crankshaft, ...Crankpin, 'Coil spring. 52-・S4・・・Rotor,・Eccentric member, Patent issuer: Sanyo Denki”, llA-,1

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 The upper end side of the crankshaft provided on the rotor constituting the electric element is inserted into and held by a bearing part integrally formed with the support frame, and the crankshaft is connected to the compression element via an eccentric member. In the single-cylinder reciprocating type hermetic electric compressor, a compressor having a low coefficient of friction is provided with a jaw portion protruding from the outer periphery of the upper end of the cylindrical body on the inner diameter surface of the upper side of the bearing portion of the support frame. A hermetic electric compressor characterized by a bearing made of reinforced synthetic resin.