KR200205395Y1 - Supply structure for lube-oil of enclosed type compresser - Google Patents

Abstract

The present invention relates to a lubricating oil supply structure of a compressor that can smoothly supply lubricating oil in a hermetic compressor.

The structure according to the present invention is an outer guide path formed on the outer circumferential surface of the crankshaft to guide the lubricating oil to the upper side, and the frame is tightly supported on the crankshaft to block the exit of the outer guide path, the outlet of the outer guide path An outer guide path formed on the crankshaft to supply a portion of the lubricant oil out through the upper surface of the frame, and another portion of the lubricant oil exiting the outlet of the outer guide path to the top of the crankshaft. It is configured to include a connecting hole formed. And the outer guide path is formed by the guide groove formed in the upper and lower direction at the upper end of the outer peripheral surface of the crankshaft, or by chamfering one side of the exit of the outer guide path of the crankshaft, it is possible to be formed between the frame.

Description

Lubricant Supply Structure of Hermetic Compressor

The present invention relates to a lubricating oil supply structure of a hermetic compressor, and more particularly to a structure of a crankshaft having a lubricating oil distribution structure capable of proper distribution of lubricating oil.

A hermetic compressor (hereinafter simply referred to as a compressor) refers to a device for compressing and supplying a working fluid such as a refrigerant in a hermetically sealed container. Looking at the general configuration with reference to Figure 1, the interior of the sealed container 10 consisting of the upper casing 12 and the lower casing 14, the transmission unit 20 for generating a rotational power by the application of current And a compression unit 30 for compressing the working fluid by the transmission unit 20.

The transmission unit 20 includes a stator 22 that generates a predetermined electromagnetic force by applying an electric current, and a rotor 24 that rotates by the electromagnetic force of the stator 22.

The compression unit 30 includes a crank shaft 32 rotating together with the rotor 24, a connecting rod 33 performing linear reciprocating motion by the rotational movement of the crank shaft 32, and the controller. It is composed of a piston 36 for compressing the working fluid in the cylinder block 38 by the necking rod 33.

The crankshaft 32 rotates like the rotor 24, and has an eccentric pin 32p in an eccentric position at the upper end thereof. One side of the connecting rod 33 is rotatably inserted in the eccentric pin 32p to reciprocate the piston 36 with respect to the rotational movement of the connecting rod 33. And the other side of the connecting rod 33 is pin-connected with one side of the piston 36, it is configured to compress the working fluid while substantially reciprocating the piston 37 in the cylinder 38.

Lubricating oil (L) is contained in the sealed container (17), and the lower end of the crankshaft (32) maintains the state immersed in the lubricating oil (L). The upper part of the crankshaft 32 is supported by the frame 35.

As shown, a pumping mechanism 32a is installed inside the lower end of the crankshaft 32 in which the lower end is locked in the lubricating oil L, and the lubricating oil L is pumped upward by the pumping mechanism 32a. The lubricating oil L, which is popped upward, is guided upwardly through a guide path 32b composed of an inner guide path 32bi and an outer guide path 32bo inside the crankshaft. The lubricating oil guided to the upper part of the crankshaft 32 is scattered near the eccentric pin 32p of the upper part of the crankshaft 32 and is supplied to various contact motion parts requiring the lubricating oil in the compression part 30. It becomes a predetermined lubrication action. In addition to the lubrication as described above, the lubricating oil L also serves as a cooling effect. In other words, the inside of the hermetic compressor also acts to cool the heat generated by the contact movement.

The guide path 32b for guiding lubricating oil will be described. The inner guide path 32bi formed in the upper portion of the crank shaft 32 supplies the lubricating oil pumped upward by the pumping mechanism 32a to the upper portion by the centrifugal force of the crank shaft 32. The lubricating oil L is guided to the upper part of the crankshaft 32 along the outer guide path 32bo leading from the inner guide path 32bi to the outer circumferential surface of the crankshaft 32.

Next, the configuration of the external guide path 32bi and the flow of the lubricating oil therethrough will be described with reference to FIG. 2.

As shown in the figure, the lubricating oil guided upwardly through the outer guide path 32bo is eccentric pin 32p through a connecting path 32bc formed to vertically penetrate the balancer 32f of the crankshaft 32. After being guided to the) side, it is scattered to the connecting rod 33 and the piston 36 and the cylinder 38 side through the upper end of the crankshaft 32 to perform a predetermined lubrication and cooling action.

At this time, the lubricating oil guided upward is guided into the connection path 32bc of the balancer 32f through the upper end 32bt of the external guide path 32bo. Here, since most of the sections except the upper end 32bt of the external guide path 32bo are blocked by the frame 35 from the lower side, there is almost no loss of lubricant in the path to the upper end 32bt. Of course, even in this process of supplying the lubrication action is required where the lubrication with the frame 35 is natural.

However, the outlet 32bt of the outer guide path 32bo directly below the balancer 32f is kept mostly open between the upper surface of the frame 35 and the balancer 32f. Since the outlet 32bo of the outer guide path 32bo is in the open state on the upper part of the frame 35 in this way, the lubricating oil supplied is between the lower surface of the balancer 32f and the frame 35 trust portion 35a. Lubricant is supplied to the contact surface.

In addition, since the lower part of the outer guide path 32bo is substantially blocked by the frame 35 and is opened at the outlet 32bt, the centrifugal force caused by the rotation of the crankshaft 32 is momentarily. Since the lubricating oil supplied to the outlet 32bt of the external guide path 32bo is largely instantaneous due to centrifugal force, the space between the balancer 32f and the frame 35, that is, the thrust portion 35a You will exit to the side.

In practice, however, in the compressor, the cylinder 38 passes through the upper portion of the eccentric pin 32p above the crankshaft 32, rather than the lubricating oil that exits from the outlet 32bt of the external guide path 32bo to the thrust 35a as described above. More lubricating oil is scattered to the side.

According to the conventional structure as described above, since the amount of oil exiting from the outlet 32bt of the outer guide path 32bo formed on the crankshaft 32 to the outside is large, the piston 37 is moved from the upper end of the crankshaft 32 to the piston 37 side. There exists a possibility that the quantity of the lubricating oil supplied may become insufficient.

That is, according to the conventional structure, even though it is possible to maintain the static level of the lubrication flow passage at room temperature at which the viscosity of the lubricating oil is high, especially at low temperatures where the viscosity of the lubricating oil is low, most of the lubricating oil escapes to the thrust 35a side. It is insufficient to supply to the eccentric pin side.

If lubricating oil is not sufficiently supplied in this way, abrasion occurs due to lack of lubricating oil between the piston 36 and the cylinder 38, which are the most friction parts in the compressor, and at the same time, frictional heat due to excessive friction is generated. After all, this drawback appears to be a problem in the operation of the compressor that requires smooth lubrication and sufficient cooling, the reliability of the product itself is a problem.

An object of the present invention is to provide a lubricating oil supply structure capable of properly distributing and supplying lubricating oil as a whole, including the most friction part in the compressor.

Substantially, the present invention, in the supply structure of the lubricating oil associated with the crankshaft, does not cause any problem even if a relatively very small amount of lubricating oil is supplied to the trust 35a side, and a sufficient amount must be supplied to the upper eccentric pin side. Attention to the point.

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

2 is an enlarged view of a part corresponding to A of FIG. 1, showing a conventional crankshaft structure.

Figure 3 is a detailed front view showing the structure of the crankshaft according to the present invention.

Figure 4 is a side view showing the structure of the crankshaft according to the present invention.

Figure 5 is a front view showing the structure of the crankshaft according to another embodiment of the present invention.

Figure 6 is a side view showing the structure of the crankshaft according to another embodiment of the present invention.

* Explanation of symbols for main parts of the drawings

50: crankshaft 52: external guide path

54: exit 56: outer peripheral groove

60: guide groove 62: connector

59: frame

According to the present invention for achieving the above object, the present invention and the outer guide path formed on the outer circumferential surface of the crankshaft to guide the lubricating oil to the upper side; A frame closely attached to the crankshaft to block the exit of the external guide path; An outer guide path which is a guide groove formed in an upper and lower direction in an upper end portion of an outer circumferential surface of the crank shaft to supply a part of the lubricating oil exiting the outlet of the inner guide path to an upper surface of the frame; And a connection hole formed at an upper portion of the crankshaft to supply another portion of the lubricating oil exiting the outlet of the outer guide path to the upper portion of the crankshaft, wherein the upper crankshaft of the guide groove has an outer circumferential groove along a circumferential surface thereof. It is characterized by being molded.

The outer guide path is composed of a guide groove formed in the vertical direction of the upper end of the outer peripheral surface of the crankshaft.

The adjustment of the lubricating oil through the outer guide path is configured to be adjustable by adjusting the cross-sectional area of the outer guide path.

According to such a structure, it is possible to adjust the balance and the amount of lubricating oil supplied to the thrust part of a frame to a relatively small amount, and to supply sufficient lubricating oil to the piston part of a compressor.

According to one embodiment of the outer guide path, it is composed of a guide groove formed in the vertical direction of the upper end of the outer peripheral surface of the crankshaft. According to another embodiment, the outer guide path is formed between the frame by chamfering one side of the exit of the outer guide path of the crankshaft.

Therefore, the adjustment of the lubricating oil through the outer guide path can be controlled by adjusting the cross-sectional area of the outer guide path, and by this adjustment, the lubricating oil supplied toward the trust can be properly distributed.

Next, the present invention will be described in more detail with reference to the embodiments shown in the drawings.

3 and 4 illustrate the structure of the crankshaft 50 and the connection of the frame 59 according to the present invention. As shown, according to the present invention, the outlet 54 of the outer guide path 52 formed on the upper outer periphery of the crankshaft 50 is configured to be blocked by the side wall 59a of the frame 59. The configuration in which the outlet 54 is blocked by the frame 59 can be achieved by substantially closing the outlet 54 of the outer guide path 52 to a lower position than the conventional one. That is, the exit guide 54 of the outer guide path 52 is formed to be spaced downward from the balancer 53 so as to be blocked by the side wall 59a of the frame 59, as compared with the prior art. Means that the lubricating oil guided through the outlet 54 of the c) does not go outward directly by the centrifugal force of the rotating crank.

In addition, the guide groove 60 facing upward from the outlet 54 is formed on the outer circumferential surface of the crankshaft 50. The guide groove 60 is for forming the outer circumferential surface of the crankshaft 50 to guide the supplied lubricant oil to the thrust 59t side of the frame 59. The lubricating oil guided along the guide groove 60 is supplied to the outer circumferential groove 56 formed on the outer circumferential surface of the crankshaft 50 directly below the balancer 53, and substantially the balance 53 and the frame ( Lubricating oil is supplied to the thrust 59t side through the space between 59). The outer circumferential surface groove 56 is configured to be able to adjust the amount of lubricating oil exiting outward (to the thrust side) according to the amount of lubricating oil supplied while the lubricating oil guided through the guide groove 60 is temporarily stored. And in FIG. 4, such a supply path of lubricating oil is shown by the arrow.

At the outlet 54 of the outer guide path 52, a connection hole 62 is formed which extends upward through the inside of the balancer 53. The connecting hole 72 guides the lubricating oil to the upper end (eccentric pin portion) of the crankshaft 50 so that the lubricating oil can be scattered through the upper portion of the crankshaft 50. It is shown by the arrow in the figure.

As described above, according to the present invention, when the lubricating oil supplied through the crankshaft comes out through the outer guide path 52 formed on the upper outer circumferential surface of the crankshaft 50, and exits the outlet 54, at the outlet 54. It is structured so that it does not exit directly outside. In other words, the lubricating oil exiting the outlet 54 is prevented from exiting outwardly by the side wall 59a of the frame 50. And a part of the lubricating oil which exited the outlet 54 is moved to the upper side by a small amount along the guide groove 60 formed toward the upper side from the outer surface of the crankshaft 50 to exit to the trust side. And the other part of the lubricating oil which exits the said outlet 54 is guided to the upper part of the crankshaft 50 along the connection hole 72. As shown in FIG.

That is, the outlet 54 is blocked using the side wall 59a of the frame 59, and a part of the outlet 54 is guided outward through the guide groove 60 which is connected to the outlet 54, and the other part connects the connection hole 72. It is leading to the upper part through. Substantially, the amount of lubricating oil guided upwardly through the connecting hole 62 will be relatively higher than the amount of lubricating oil guided to the outside. Here, the amount of lubricating oil exiting through the guide groove 60 to the outside can be appropriately adjusted in consideration of the cross-sectional size of the guide groove.

Next, a brief description of another embodiment of the present invention with reference to FIG. Here, the same components as in the above embodiment will be described with the same reference numerals.

As shown, according to this embodiment, the lubricant supplied through the outlet 54 of the outer guide path 52 is configured to be stopped once by the side wall 59a of the frame 59, and then the frame 59 The lubricating oil can be guided outward through the space 72 formed between the side wall 59a of the crankshaft and the crankshaft 50. That is, the guide groove is omitted in comparison with the above-described embodiment, so that the lubricating oil can be supplied to the outside by the space 72 formed by one side of the upper end of the outlet 54 and the frame 59 in the crankshaft 50. To construct.

The space formed between the frame 59 and the outlet 50 of the crank side 50 is formed by chamfering a part of the upper surface of the outlet 54 of the crankshaft 50 in the illustrated embodiment. That is, as shown in the figure, the lubricating oil can be supplied to the outside (thrust side) by the space 72 formed between the chamfer 70 and the frame 59 of the crankshaft 50.

And a part of the lubricating oil is supplied through the space 72 formed between the frame 59 by the chamfer 70, the other part to the upper end of the crankshaft 50 as in the embodiment It will be supplied to the upper through the connecting hole (62). Of course, also in this embodiment, it is possible to form the outer circumferential groove 56 having the same structure and function as in the above-described embodiment.

Also in this embodiment, the outlet 54 is blocked by the side wall 59a of the frame 59 so that the lubricating oil exiting the outlet 54 of the outer guide path 52 can be prevented from directly escaping to the outside. A separate space 72 is formed between the frame 59 and the crankshaft 50. Therefore, it is possible to relatively sufficiently adjust the amount of guiding the lubricant flowing out through the space 72 to the upper side.

As described above, according to the present invention, it is possible to adjust the amount of lubricant supplied through the outlet of the external guide path to the amount of the outward and the amount supplied to the upper portion. In other words, it is possible to sufficiently adjust the amount of lubricating oil supplied to the compressor part after being supplied to the upper part.

According to this kind of design, it is possible to provide sufficient lubrication function and cooling function in the parts inside the compressor that require a large amount of lubricating oil, that is, the parts with high contact drive, thereby ensuring the reliability of the product. There is an advantage to this.

Claims (3)

An external guide path formed on an outer circumferential surface of the crankshaft to guide the supplied lubricant upward; A frame closely attached to the crankshaft to block the exit of the external guide path; An outer guide path, which is a guide groove formed in an upper and lower direction in an upper end portion of an outer circumferential surface of the crank shaft to supply a part of the lubricating oil exiting the outlet of the outer guide path to an upper surface of the frame; And a connection hole formed at an upper portion of the crankshaft to supply another portion of the lubricating oil exiting the outlet of the outer guide path to the upper portion of the crankshaft, wherein the upper crankshaft of the guide groove has an outer circumferential groove along a circumferential surface thereof. Lubricant supply structure of the compressor to be molded. The lubricating oil supply structure of a compressor according to claim 1, wherein the outer guide path comprises a guide groove formed in an up-down direction at an upper end of an outer circumferential surface of the crankshaft. The lubricating oil supply structure of the compressor according to claim 1, wherein the adjustment of the lubricating oil through the outer guiding path is configured to be adjustable by adjusting a cross-sectional area of the outer guiding path.