JPS6240133Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a Scotch yoke type electric compressor. In particular, it is possible to create a compact and efficient compressor by reducing the power loss caused by the sliding of the slider and the slide tube formed integrally with the piston. The purpose is to provide

Next, a conventional Scotch yoke electric compressor will be explained with reference to FIGS. 1 and 2.

1 is a closed container that is kept airtight from the outside. Reference numeral 2 denotes a support frame body having a compression element 3 attached to the upper part and an electric element 4 attached to the lower part, and is suspended in the closed container 1 via a support device 5 using a spring. Reference numeral 6 denotes a stator of the electric element 4, which is fixed to the support frame 2. Reference numeral 7 denotes a crankshaft which is press-fitted into the rotor 8 of the electric element 4 and which is attached to the support frame 2.
It is supported by a bearing 9 provided at.

10 is the cylinder of the compression element 3 and the support frame 2
is fixed at the top of the. 11 is the cylinder 1
A slide tube 12 is integrally formed at the end of the piston. 13 is a cylindrical slider inserted so as to be able to slide inside the slide tube 12, and a through hole 14 is provided in the center of the slider.
The tip eccentric portion 15 of the crankshaft 7 is rotatably inserted into the crankshaft 7 .

Numeral 16 is lubricating oil stored in the inner bottom of the closed container 1, and 17 is an oil supply passage provided in the crankshaft 7, through which the lubricating oil 16 is supplied to the rotating and sliding parts. Reference numerals 18 and 19 denote a refrigerant suction pipe and a refrigerant discharge pipe, both of which penetrate the wall of the closed container 1.

In the above configuration, when the electric element 4 is energized, the crankshaft 7 rotates together with the rotor 8, and the piston 11 is moved into the cylinder 10 via the slider 13 and the slide tube 12 due to the circular movement of the tip eccentric portion 15 of the crankshaft. make a reciprocating motion. Thereby, the low-pressure refrigerant gas sucked from the suction pipe 18 can be compressed by the compression element 3 and guided to the outside from the discharge pipe 19 as a high-pressure refrigerant gas.

At this time, the required motor output of the compressor is the sum of the gas compression power and the loss power of the rotating sliding part.

During the gas compression stroke of the piston 11, gas compression force acts on the piston-side sliding surfaces of the slider 13 and slide tube 12, and the surface pressure on the sliding surfaces increases as the piston approaches the top dead center. Further, during the gas intake stroke of the piston 11, the inertia force of the piston 11 acts on the sliding surfaces of the slider 13 and the slide tube 12 on the side opposite to the piston.

Although the surface pressure during the suction stroke is smaller than the surface pressure during the compression stroke, the sliding area of the slider is generally determined with emphasis on the surface pressure during the compression stroke in consideration of wear resistance. For this reason, it was necessary to prepare for a certain amount of power loss due to sliding.

The present invention aims to reduce power loss due to sliding between the slide tube and the slider, and the configuration of the main parts will be explained below with reference to FIGS. 4 and 5.

That is, the slider 13 that slides inside the slide tube 12 that is integrally formed with the piston 11 is made into a spherical body, and the through hole 14 provided in the center of the slider 13 is provided with a through hole 14 so that the end eccentric portion 15 of the crankshaft 7 can rotate as in the conventional case. is inserted into.

FIG. 6 shows another embodiment of the slider 13. By making the slider 13 a spherical body and providing a straight portion 20 at one end thereof, there is an advantage that manufacturing of the slider is generally easier.

Therefore, the slide tube 12 and slider 13
The outside of the slider 13 has a line contact as opposed to a conventional surface contact, and the slider 13 performs a reciprocating motion while rotating within the slide tube 12 along with the rotational movement of the crankshaft 7, making it possible to reduce the surface pressure compared to the conventional slider. I can do it.

In addition, since the slider 13 and the slide tube 12 do not contact on the same plane, but come into full contact due to rotation, uneven wear is eliminated, which is advantageous in terms of wear resistance, and power loss due to sliding can be greatly reduced. can.

As mentioned above, the Scotch yoke type electric compressor according to the present invention has a spherical slider that slides in the slide tube formed integrally with the piston into which the eccentric end of the crankshaft is inserted, so it has an extremely simple structure. , it is possible to reduce power loss and the required power of the motor, and it is possible to provide a compact and efficient compressor.

[Brief explanation of the drawing]

Figure 1 is a cross-sectional side view of the main parts of a Scotch yoke type electric compressor to which the present invention is applied, Figure 2 is a cross-sectional view of the main parts of the slide tube and slider section of a conventional compressor, and Figure 3 is the slider shown in Figure 2. , FIG. 4 is a sectional view of the main parts of the slide tube and slider section in the compressor of the present invention, FIG. 5 is an oblique view of the slider in FIG. 4, and FIG. 6 is another implementation equivalent to FIG. 5. FIG. 3 is an example perspective view. It should be noted that the same or corresponding parts have been designated with the same numbers. 10...Cylinder, 11...Piston, 12...
...Slide tube, 13...Slider, 7...Crankshaft, 15...Tip eccentric part.

Claims (1)

[Scope of utility model registration request] A slide tube is integrally formed at the end of a piston that reciprocates within the cylinder, and an eccentric tip end portion of a crankshaft driven by an electric element is rotatably inserted into the center of the slider housed in the slide tube, A Scotch yoke type electric compressor, wherein the slider is formed of a spherical body.