KR200264471Y1 - An eccentric adjusting structure of crank shaft for hermetic compressor - Google Patents

Abstract

The present invention relates to a crankshaft eccentric control structure of a hermetic compressor. In the present invention, the eccentric pin 22 of the crankshaft 20 is designed to have a constant amount of eccentricity at the center of rotation, and the diameter change of the circular trajectory of the large end 32 of the connecting rod 30 for changing the compression chamber volume. Is produced by the eccentric sleeve (40). To this end, the eccentric sleeve 40 has an outer diameter to be seated in the through hole 33 formed in the large end portion 32 of the connecting rod 30, the pin hole 42 is inserted into the eccentric pin 22 Adjust the position of the eccentric in the center (c) of the eccentric sleeve 40. The eccentric sleeve 40 is freely rotated with respect to the eccentric pin 22 and is seated in the through hole 33 is fastened to the connecting rod 30 by the fastening key 37. According to the present invention as described above, only the eccentric sleeve 40 having a simple configuration can be produced differently according to the design conditions for each compressor, and the crankshaft 20 can produce compressors having various performances even if only one type is produced. Will be. In addition, since the eccentric sleeve 40 is fastened to the large end 32 by the fastening key 37, the fastening operation becomes easier.

Description

An eccentric adjusting structure of crank shaft for hermetic compressor

The present invention relates to a compressor, and more particularly to a crankshaft eccentric control structure of the hermetic compressor to fix the eccentric amount by fixing the eccentric sleeve to the connecting rod.

Figure 1 shows the internal configuration of a hermetic compressor of the connecting rod method according to the prior art. According to this, the sealed container 1 which consists of the upper container 1t and the lower container 1b is provided, and the frame 2 is supported inside the sealed container 1. The fixing part 3 is fixed to the said frame 2, The said fixing part 3 is supported in the airtight container 1 by the spring 2s.

There is a rotating part 4 which is located inside the fixing part 3 and rotates by electromagnetic interaction with the fixing part 3. The crankshaft 5 which is comprised integrally with the said rotation part 4 and penetrates the center of the said frame 2 is provided. At the lower end of the crankshaft 5, a propeller 5d for sucking up the oil L on the bottom surface of the lower container 1b into the oil flow passage 5a formed on the crankshaft 5 is provided.

Here, the upper part of the crankshaft 5 will be described with reference to FIG. 2. At the upper end of the crankshaft 5, an eccentric portion 5b is eccentric with respect to the rotation center of the crankshaft 5. Here, the crankshaft 5 and the eccentric portion 5b have a cylindrical shape. Since the center and the center of gravity are the same, the distance between each center is the amount of eccentricity e.

On the other hand, due to the change in the eccentricity e, the stroke distance, which is the distance at which the piston 7 operates in the cylinder 6, changes. And the counterweight (5c) is formed on the opposite side formed with the eccentric (5b) serves to balance the center of gravity of the rotating part including the crank shaft (5) by the weight of the eccentric (5b).

Referring back to FIG. 1, the piston 7 connected at the other side of the connecting rod 8 performs a linear reciprocating motion in the cylinder 6. On the other hand, a valve assembly 9 is installed at the tip of the cylinder 6 to control the working fluid flowing into and out of the compression chamber 6 '.

The head cover 10 is mounted on the valve assembly 9, and the head cover 10 is connected to the valve assembly 9 so that the suction muffler 11 can transfer refrigerant to the compression chamber 6 ′. It is installed.

There is a suction pipe 12 formed through the sealed container 1 to supply a working fluid to the suction muffler 11. In addition, the working fluid compressed through the discharge pipe 13 formed through the sealed container 1 is connected to the suction pipe 12.

The compressor having such a configuration has the crank shaft integrally formed with the rotating part 4 when the rotating part 4 rotates by electromagnetic interaction between the rotating part 4 and the fixing part 3 when power is applied. 5) will rotate. When the crankshaft 5 rotates, the crankshaft 5 is attached to the crankshaft 5 so that the eccentric portion 5b having the eccentricity e moves in a circular motion while drawing a circle. The connecting rod 8 connected to the eccentric portion 5b is interlocked with the rotating eccentric portion 5b to linearly reciprocate the piston 7.

However, the prior art as described above has the following problems.

That is, since the compressor has various specifications, the volume of the in-cylinder compression chamber is changed according to each specification. Thus, in order to change the volume of a compression chamber, the stroke distance of the piston 7 is adjusted.

In addition, the stroke distance adjusting method of the piston 7 is to adjust the eccentricity (e) of the eccentric portion (5b) of the crankshaft (5), conventionally the crankshaft (5) for the adjustment of the eccentricity (e) ) And a separate crankshaft 5 having different distances, i.e., the amount of eccentricity e, from each other.

However, when manufacturing the crankshaft (5) according to the specifications of each compressor in this way, a mold for manufacturing the crankshaft (5) must be made separately, and these molds and the manufactured crankshaft (5) must be managed separately. This occurred.

Accordingly, an object of the present invention is to solve the conventional problems as described above, and to enable the crankshaft to be used for general purposes.

Another object of the present invention is to be able to easily and quickly set the amount of eccentricity of the crankshaft.

1 is a cross-sectional view showing the configuration of a conventional hermetic compressor.

2 is a perspective view showing a crankshaft eccentric structure of a conventional hermetic compressor.

Figure 3 is a perspective view showing the configuration of a preferred embodiment of the crankshaft eccentric control structure of the hermetic compressor according to the present invention.

Figure 4 is a plan sectional view showing a configuration of an embodiment of the present invention.

Explanation of symbols on the main parts of the drawings

1: airtight container 2: frame

3: stator 4: rotor

5: crankshaft 5b: eccentric part

5e: oil supply part 6: cylinder

7: piston 8: connecting rod

10: head cover 11: suction muffler

12: suction pipe 13: discharge pipe

20: connecting rod 22: eccentric pin

24: counterweight 30: connecting rod

32: high end 33: through-hole

35: keyway 37: fastening key

40: eccentric sleeve 42: pin ball

43: keyway 50: cylinder

52: piston

According to a feature of the present invention for achieving the object as described above, the present invention is formed to be eccentric in the center of rotation to rotate and transfer the power received from the drive source eccentric pin to draw a circular trajectory with respect to the center of rotation A crank shaft having a crank shaft, a connecting rod connected to the eccentric pin for converting a circular motion of the eccentric pin into a linear reciprocating motion of the piston, and an eccentric portion of the connecting rod which is fastened to the connecting rod with respect to the center of rotation of the crank shaft. Consists of an eccentric sleeve for adjusting the, and a fastening key for operating the eccentric sleeve and the connecting rod integrally.

The fastening key is accommodated in a key groove formed in the connecting rod and the eccentric sleeve, respectively.

The fastening key is formed on any one side of the connecting rod and the eccentric sleeve, the key groove is formed in the connecting rod and the eccentric sleeve in a position relative to the fastening key.

According to the present invention of such a configuration, the eccentric amount of the eccentric pin of the crankshaft can be kept constant while the diameter of the trajectory formed by one end of the connecting rod can be adjusted by an eccentric sleeve with a simple configuration. There is an advantage that it becomes easy.

Hereinafter, preferred embodiments of the present invention as described above will be described in detail with reference to the accompanying drawings.

3 is an exploded perspective view of the configuration of a preferred embodiment of the present invention, Figure 4 is a plan view of the configuration of the embodiment of the present invention. As shown in these figures, the crankshaft 20 rotates integrally with the rotor of the motor unit, and a portion which becomes the center of rotation of the crankshaft 20 penetrates up and down the center of the rotor.

An eccentric pin 22 is provided at the upper end of the crankshaft 20. The eccentric pin 22 is formed to be eccentric at the center of rotation of the crank shaft 20, the large end 32 of the connecting rod 30 to be described below is circled by the rotation of the crank shaft 20 Exercise while drawing the trajectory. A counterweight 24 is provided at the upper end of the crankshaft 20 to remove rotational imbalance that may be caused by the eccentricity of the eccentric pin 22.

The connecting rod 30 converts the rotational movement of the crankshaft 20 into a linear reciprocating motion of the piston 52, which will be described below, and has a large end portion at one end for connection with the crankshaft 20. 32). The through hole 33 is formed through the center of the large end portion 32. The key groove 35 is formed at one side of the through hole 33. A fastening key 37 is installed in the key groove 35 to fasten the eccentric sleeve 40 and the connecting rod 30 to be rotated integrally.

The eccentric sleeve 40 makes the diameter of the circular locus drawn by the large end 32 of the connecting rod 30 different from the eccentric pin 22 in the crankshaft 20 to make the eccentric amount constant. Instead of the eccentric pin 22, each produces a different amount of eccentricity. The eccentric sleeve 40 is formed in a disc shape, and is seated in the through hole 33 of the connecting rod 30. The eccentric sleeve 40 is formed with a pin hole 42 is inserted into the eccentric pin 22, the degree that the pin hole 42 is eccentric in the center (c) of the eccentric sleeve 40 (e ' ), The amount of eccentricity is determined. The key groove 43 is formed at one side of the eccentric sleeve 40.

A small end (not shown) is provided on the opposite side of the large end 32 of the connecting rod 30. The small end is connected to the piston 52, the piston 52 is a linear reciprocating movement by receiving the power of the connecting rod 30 in the interior of the cylinder (50).

Hereinafter will be described the operation of the eccentric control structure of the hermetic compressor according to the present invention having the configuration as described above.

First, it will be described that the structure of the present invention is assembled. The crankshaft 20 is installed in the frame, and the small end of the connecting rod 30 in the state in which the large end 32 of the connecting rod 30 extends over the eccentric pin 22 of the crankshaft 20. It is connected to the piston 52 installed inside the cylinder 50.

And the eccentric pin 22 in the position formed by the pin hole 42 of the eccentric sleeve 40 to be inserted into the large end 32 of the connecting rod 30 is eccentric. The eccentric sleeve 40 is seated in the through hole 33 of the large end portion 32 of the connecting rod 30.

At this time, the eccentric sleeve 40 should be seated in the through hole 33 at the same time as the eccentric pin 22 is inserted into the pin hole 42. The key groove 35 of the connecting rod 30 and the key groove 43 of the eccentric sleeve 40 coincide with each other, and the fastening key 37 is inserted into the key grooves 35 and 43. . In this case, the operation of connecting the crankshaft 20 and the piston 52 is completed.

On the other hand, in order to vary the volume of the compression chamber inside the cylinder 50, the diameter of the circular trajectory in which the end 32 of the connecting rod 30 rotates must be different. To this end, the eccentric sleeve 40 is replaced. That is, the entire diameter is to be inserted into the through hole 33, the eccentric sleeve 40 may be manufactured so that the position of the pin hole 42 is different.

Next, instead of forming the key grooves 35 and 43 on both the connecting rod 30 and the eccentric sleeve 40 as a variation of the present invention, they are formed on any one side of the connecting rod 30 and the eccentric sleeve 40. In addition, the counterpart may be integrally formed with a key inserted into the key groove.

In the present invention as described in detail above, the amount of eccentricity can be adjusted by changing the position of the pin hole of the eccentric sleeve. Therefore, if the crankshaft is always used the same thing and only replace the eccentric sleeve which is relatively easy to manufacture, it is possible to change the volume of the compression chamber by creating the desired amount of eccentricity.

Therefore, one crankshaft can be produced and used in a compressor having various performances and specifications, thereby achieving an effect of lowering the production cost of the crankshaft.

In the present invention, the eccentric sleeve is fastened to each other by using a fastening key to rotate integrally with the crankshaft. In this way, when the connecting rod and the crankshaft are connected to the eccentric sleeve, it is not necessary to use the equipment for press-fitting.

Claims (3)

A crankshaft having an eccentric pin which is eccentrically formed at the center of rotation for rotating and receiving power from a driving source and drawing a circular locus with respect to the center of rotation; A connecting rod connected to the eccentric pin to convert a circular motion of the eccentric pin into a linear reciprocating motion of the piston, An eccentric sleeve fastened to the connecting rod and adjusting an eccentricity of one end of the connecting rod with respect to the rotation center of the crankshaft; Crankshaft eccentric control structure of the hermetic compressor characterized in that it comprises a fastening key for fastening the eccentric sleeve and the connecting rod to operate integrally. The crankshaft eccentric control structure of a hermetic compressor of claim 1, wherein the fastening key is accommodated in a key groove formed in each of the connecting rod and the eccentric sleeve. The hermetic compressor of claim 1, wherein the fastening key is formed on one side of the connecting rod and the eccentric sleeve, and a key groove is formed in the connecting rod and the eccentric sleeve at a position corresponding to the fastening key. Crankshaft eccentric control structure.