KR20070010520A - Hermetic type compressor - Google Patents

Abstract

A hermetic compressor lubrication structure is provided to lubricate and cool frictional surfaces by forming an oil bank in a connection passage section of an eccentric section of a rotary shaft. A hermetic compressor lubrication structure includes a closed case, a frame, a lower power transmission mechanism and an upper compression mechanism, a rotary shaft(400), and a connecting rod. The frame is accommodated in the closed case. The lower power transmission mechanism and the upper compression mechanism are mounted to the frame. The rotary shaft is installed in the frame so that the rotational force of the power transmission mechanism can be transferred to the compression mechanism. The rotary shaft includes an eccentric section(410) connected to the compression mechanism. The connected rod is engaged with the eccentric section. An oil bank is formed on a contact surface between an eccentric section of the rotary shaft and the connecting rod so that oil can be left on the contact surface.

Description

Hermetic Compressor {HERMETIC TYPE COMPRESSOR}

1 is a cross-sectional view showing the oil supply structure of the conventional rotation shaft eccentric portion.

2 is a cross-sectional view showing the internal configuration of a hermetic compressor to which the rotary shaft eccentric part is applied according to the present invention.

3 is a cross-sectional view showing the oil supply structure of the oil in which the oil bank is formed in the rotary shaft eccentric portion according to the present invention.

Figure 4 (a) to (c) is a cross-sectional view showing a second embodiment of the oil supply structure in which the oil bank is formed in the rotary shaft eccentric portion according to the present invention.

Figure 5 (a) to (c) is a cross-sectional view showing a third embodiment of the oil supply structure in which the oil bank is formed in the rotary shaft eccentric portion according to the present invention.

FIG. 6 is a cross-sectional view illustrating a connection relationship between a rotating shaft, a connecting rod, and a piston when the piston shown in FIG. 5 reaches a top dead center. FIG.

7 (a) to 7 (c) are cross-sectional views showing a fourth embodiment of an oil supply structure in which an oil bank is formed in an eccentric portion of a rotation shaft.

8 (a) to 8 (c) are cross-sectional views illustrating an oil supply structure in which an oil bank is formed in a rotation shaft eccentric part showing a modification according to the above embodiments.

Explanation of symbols on the main parts of the drawings

400: rotation axis 410: eccentric portion

550: heavy sharing 560: connection

600: oil bank 700: oil euro

The present invention relates to a hermetic compressor, and more particularly to a hermetic compressor having an improved lubrication structure so that oil can be sufficiently supplied between the eccentric portion of the rotating shaft and the connecting rod.

Japanese Patent Application Publication JP-63-85270 discloses a technique for lubricating each drive part of a compressor by using the centrifugal force of the rotating shaft.

As shown in FIG. 1, the rotary shaft of the hermetic compression press is configured to raise oil accumulated at the bottom of the sealed case when the rotary shaft 10 rotates, and an oil pickup member (not shown) is installed below the rotary shaft. An eccentric flow path (not shown) eccentric with respect to the center of the rotation shaft is formed on the rotary shaft above the oil pick-up member, and a spiral flow path 50 formed by a spiral groove connected to the eccentric flow path is formed on the outer circumferential surface of the rotary shaft.

In addition, the eccentric portion 20 of the rotary shaft 10 is formed with a hollow common passage 30 connected to the upper end of the spiral flow path 50 so as to enable oil supply to the piston (not shown), the upper shared passage ( In the central portion of the 30 is connected to the eccentric portion 20 and the connecting rod (not shown) is connected to the circumferential direction of the eccentric portion 20 in the radial direction of the eccentric portion 20 so as to enable oil supply.

In operation of the hermetic compressor, the rotating shaft rotates with a certain direction. As the rotating shaft rotates, the oil is lifted through the oil pick-up tube and is raised through each oil channel formed on the rotating shaft by the rotating centrifugal force of the rotating shaft. It is transmitted to the friction part and the heating part.

In this way, the oil splashed upward through the heavy sharing path 30 inside the eccentric part 20 is transferred to the friction part and the heating part while being lubricated and cooled. In addition, some of the oil delivered to the hollow sharing passage in the eccentric portion 20 flows into the connection passage 40 and is responsible for lubrication and cooling of the friction portion formed between the eccentric portion and the connecting rod.

However, in the lubrication structure of the rotating shaft eccentric portion according to the prior art, the structure is lubricated by a very fine gap between the eccentric portion of the rotating shaft and the connecting rod, so that a sufficient amount of oil is not supplied to the friction portion between the eccentric portion and the connecting rod. Because of the structure, there is a problem that causes wear of the parts.

In particular, when the drive motor stops, the oil that has lubricated between the rotating shaft and the connecting rod flows downward by its own weight, leaving only a very small amount of oil remaining.Therefore, there is almost no oil until the oil is resupplied during the initial operation of the compressor. Rotating to increase the wear and there is a problem that the abnormal noise occurs.

In addition, if the lubrication of the eccentric portion of the rotary shaft as described above at the time when the compression load reaching the top dead center of the piston is the largest, there is a problem that the durability and operation reliability of the rotary shaft is inferior.

The present invention has been made to solve such a problem, and an object of the present invention is to provide a hermetic compressor which allows sufficient oil supply to the friction portion between the eccentric portion of the rotating shaft and the connecting rod.

In order to achieve the object described above, the present invention provides a sealed case, a frame accommodated in the sealed case, a lower power mechanism unit and an upper compression mechanism unit mounted on the frame, and a rotational force of the power mechanism unit to the compressor mechanism unit. In the hermetic compressor having a rotating shaft installed on the frame and having an eccentric portion connected to the compression mechanism at the upper portion and a connecting rod fastened to the eccentric portion, oil is provided on the contact surface between the eccentric portion of the rotating shaft and the connecting rod. The oil bank is formed so that it can remain.

In addition, the oil bank is characterized in that the groove is formed in the circumferential direction on the outer peripheral surface of the eccentric portion.

Hereinafter, with reference to the accompanying drawings a preferred embodiment of the present invention that can be specifically realized the above object.

First, the overall structure of a hermetic compressor to which the rotary shaft of the present invention is applied will be described in detail with reference to the accompanying drawings. As shown in FIG. 2, the frame 120 installed through the plurality of shock absorbers 110 inside the sealed case 100, the compression mechanism 200 installed above the frame 120, and In order to drive the compression mechanism (200) is provided with a power mechanism 300 is installed on the lower side of the frame (120).

In addition, the compressor has a rotating shaft 400 which is disposed in the vertical direction by transmitting the rotational force of the transmission mechanism 300 to the compression mechanism 200, rotatably supported on the shaft support of the frame 120. In addition, the rotary shaft 400 has an eccentric portion 410 formed to be eccentric with respect to its center for connecting with the compression mechanism 200 in the upper portion, the lower portion of the eccentric portion 410 in the upper portion of the frame 120 It is provided with a bearing support 420 formed larger than the outer diameter of the rotating shaft to be supported. The thrust bearing 430 is interposed between the lower surface of the bearing support part 420 and the upper surface of the frame 120 to support the axial load of the rotating shaft 400 and to facilitate the rotation of the rotating shaft 400.

The above-described electric mechanism part 300 includes a rotor 310 coupled to an outer surface of the rotating shaft 400 and rotating together with the rotating shaft 400, and a stator 320 installed in a fixed state on the outer side of the rotor. The compression mechanism 200 includes a cylinder 210 and a cylinder head 220 forming a compression space of the refrigerant, a piston 230 for compressing the refrigerant while advancing and retracting the inside of the cylinder 210, and one end of the piston ( The connecting rod 250 is connected to the pin 240 of the 230 and the other end is connected to the eccentric portion 410 of the rotation shaft. This configuration is a rotational movement through the eccentric portion 410 of the rotating shaft 400 and the connecting rod 250 when the rotating shaft 400 is rotated by the operation of the electric mechanism unit 300 is converted into a linear reciprocating motion In this case, the refrigerant may be compressed.

In addition, the hermetic compressor is for lubrication and cooling of each driving part, and a predetermined amount of oil L is filled in the bottom of the hermetic case 100. In addition, an oil pick-up member 510 is installed at a lower portion of the rotary shaft 400 to raise oil L accumulated at the bottom of the sealed case 100 by using a centrifugal force of the rotary shaft to supply the respective driving parts. An eccentric hole 520 spaced a predetermined distance from the center of the rotation shaft 400 is formed in the rotation shaft 400 on the upper part of the member 510 to raise oil, and an eccentric hole is formed on the outer circumferential surface of the upper rotation shaft 400 of the eccentric hole 520. A spiral flow path 530 in a spiral direction communicating with 520 is formed.

Example 1

As shown in FIG. 3, the spiral passage 530 is formed with a groove having a predetermined depth. The spiral flow path 530 is to guide the oil ascending through the spiral flow path 530 when the rotating shaft 400 rotates so that the oil flow path is formed between the inner surface of the frame shaft support. In addition, lubrication and cooling may be performed between the outer surface of the rotating shaft 400 and the inner surface of the shaft support part by the rising oil.

In addition, a communication hole 540 is formed on the upper outer surface of the rotating shaft 400 in a radial direction of the rotating shaft so that the oil raised through the spiral passage 530 is guided to the eccentric portion 410. The eccentric portion 410 is formed with a hollow common passage 550 having a lower end connected to the communication hole 540 and open at an upper end thereof so as to enable lubrication toward the piston, and an eccentric portion 410 at a central portion of the hollow sharing passage 550. A connecting flow path 560 is formed in a radial direction of the eccentric portion 410 to communicate with the heavy sharing path 550 so as to enable oil supply to a portion where the connecting rod (not shown) contacts.

In addition, in the circumferential direction on the outer circumferential surface of the eccentric portion 410 so that the oil flowing out of the connection passage 560 remains on the outer circumferential surface of the eccentric portion 410 in which the connection flow path 560 is formed as a contact surface between the eccentric part and the connecting rod. The oil bank 600 is provided with a groove having a predetermined width and depth.

According to the first embodiment of the present invention as described above, the oil is supplied to the eccentric portion of the rotating shaft.

First, when the compressor is driven, the oil filled in the lower part of the compressor is swirled by the rotating centrifugal force of the rotating shaft and ascends to the oil pick-up tube, the eccentric hole, and the spiral channel. It is scattered to the upper part through the friction part and is transmitted to the heating part. In addition, some of the rising oil flows into the connection channel and flows into the oil bank to lubricate and cool the friction between the eccentric part and the connecting rod.

In particular, when the rotating shaft starts to rotate again during the initial operation of the compressor, the oil remaining in the oil bank flows out of the oil bank by centrifugal force, and the oil is properly lubricated for the eccentric portion of the rotating shaft for a transient time until the oil is supplied. It can prevent the effect of improving the performance of the compressor.

Example  2

Embodiment 2 according to the present invention is shown in Figure 4 (a) to (c) of the oil channel formed in the upper or lower portion of the eccentric in the first embodiment.

As shown in Figure 4 (a), the outer circumferential surface of the eccentric portion 410, the upper linear groove 700 recessed in a predetermined width and depth from the upper end of the oil bank 550 to the upper end of the eccentric portion 410 Is formed is supplied to the oil bank 600 through the connection flow path 560 of the eccentric portion 410 flows to the upper portion of the eccentric portion 410 by the centrifugal force of the rotating shaft 400 to connect with the eccentric portion 410 Lubricates the rod's mop to expand the flow path of the oil.

In addition, as shown in Figure 4 (b) the outer peripheral surface of the eccentric portion 410 of the eccentric portion 410 at the lower end of the upper linear groove 700 and the oil bank 600 shown in Figure 4 (a) Further comprising a lower straight groove 710 recessed to a predetermined width and depth at the lower end so that the oil supplied from the connection passage 560 to the oil bank 600 flows to the lower portion of the eccentric portion 410. It expands the flow path of the oil that lubricates the contact of the connecting rod, and at the same time, discharges fine foreign matter more effectively.

Substantially, the grooves through which the oil is formed on the outer circumferential surface of the eccentric portion have a single linear groove, and the groove is generally formed as a spiral groove. It can be made to flow. That is, oil can flow and rise therein only when it is formed opposite to the axis of rotation on the axis of rotation. Unlike the spiral grooves, the linear grooves are not affected by these geometric characteristics, and oil may flow due to the centrifugal force generated when the rotating shaft is rotated regardless of the rotation direction.

   Therefore, as shown in FIG. 4 (c), the oil bank 600 may more effectively flow the oil flowing out of the oil bank 600 by the centrifugal force of the rotating shaft 400 to the upper and lower portions of the eccentric portion 410. ), An inclined groove 720 opposite to a rotational direction (arrow direction) of the rotating shaft 400 is formed to form an upper inclined groove 720 serving as an oil flow path. In addition, the bottom of the oil bank 600 is formed with a groove inclined in the same direction as the rotation direction of the rotary shaft 400 is formed a lower inclined groove 730 to serve as an oil oil.

In addition, when the oil flows along the inclined groove, the inclination acts as one flow path resistance. As the inclination increases, the centrifugal force due to the rotation of the rotating shaft is used to overcome the flow path resistance, so that the oil movement speed gradually decreases. The inclination angle of the groove is preferably given an appropriate inclination angle in consideration of the amount of oil, the moving speed and the stress applied to the friction part.

                        Example 3

According to the third embodiment according to the present invention, unlike the second embodiment, the oil lubrication of the oil bank is not by the connection flow path of the eccentric portion, but by the oil lubrication structure that is dropped by the oil that is dropped into the hollow portion, and thus (a) to (c) of FIG. ) Is shown.

 As shown in the fifth (a), the eccentric portion 410 is formed in the eccentric portion 410 is formed in the eccentric portion 410 so that the rising oil flows above the eccentric portion 410, In addition, the outer circumferential surface of the eccentric portion 410 has a groove formed in the circumferential direction to form an oil bank 600 through which oil can flow.

 In addition, as shown in FIG. 5 (d), when the piston 230 reaches the top dead center and the compression load is the greatest, the “A” point at which the maximum stress is generated in the eccentric portion 410 by the compression load is If the oil is not supplied sufficiently, the eccentric wear is most likely to occur, so there is a need to supply the oil sufficiently. At this time, the "A" point is the point where the rotational centrifugal force of the rotating shaft is maximized, so that the maximum amount of oil that is scattered and falls through the heavy sharing passage 550 is collected.

Accordingly, the oil flowing down from the hollow portion 550 of the eccentric portion 410 is formed by forming a spiral groove 810 from the top of the eccentric portion 410 to the top of the oil bank 600 at the point “A”. To lower and lower the friction between the eccentric and the connecting rod.

 The spiral groove 810 is preferably formed to be inclined in the same direction as the rotation direction of the rotary shaft so that the oil can flow smoothly without being affected by the rotary centrifugal force of the rotary shaft 400 while flowing down.

     In addition, as shown in Figure 6, the lower portion of the oil bank 600 in the lower portion of the oil bank 600 at the point "A" where the rotation centrifugal force of the rotating shaft acts at the point when the piston reaches the top dead center. By forming a spiral groove to the bottom of the core portion 410, the oil of the oil bank 600 flows down the eccentric portion 410 and lubricates the contact portion between the eccentric portion and the connecting rod to enlarge the flow path of the oil. At the same time, it serves as an outlet for fine foreign matter.

The helical lower groove 820 is also preferably formed to be inclined in the same direction as the rotation direction of the rotation shaft to flow smoothly without being affected by the centrifugal force by the rotation of the rotation shaft 400.

In addition, as shown in Figure 5 (c), the lower portion of the oil bank 600, the piston reaches the top dead center, the friction portion between the eccentric portion and the connecting rod at the point "A" where the maximum stress is generated in the eccentric portion In order to effectively distribute the stress generated in the "A" point and a distance spaced apart from the bottom of the oil bank 600 to form a groove from the bottom of the eccentric portion 410.

 Therefore, this has the effect of improving the durability of the rotating shaft by effectively dispersing the stress applied to the eccentric portion as well as expanding the flow path area of the oil and discharging foreign matter.

                             Example 4

In Example 4 according to the present invention, the oil bank further includes a connection flow passage communicating with the eccentric part of the eccentric portion in the invention described in Example 3.

As shown in Fig. 7 (a) to (c), in the invention shown in (a) to (c) of FIG. Form.

Therefore, in Example 4, a part of the oil which is scattered to the hollow part of the eccentric portion by the centrifugal force of the rotating shaft falls along the spiral inclined flow path, and a part of the oil which rises to the hollow sharing path 550 is connected to the flow path 560. It is a lubricating structure in which a sufficient amount of oil is supplied to the oil bank 600 through the oil bank 600 and supplied to the friction portion between the eccentric portion 410 and the connecting rod, thereby reducing wear of the component due to friction.

                       Example 5

Example 5 according to the present invention is an invention applied to all of the above Examples 2 to 5,

The number of oil banks may be applied to the inventions described in Examples 2 to 4 or two or three, and thus the number of oil banks connected to the oil banks may be further included depending on the number of oil banks.

As shown in FIGS. 8A to 8C, the eccentric portion 410 illustrated in Embodiments 2 to 4 has a circumferential direction on an outer circumferential surface of the eccentric portion 410 on an upper portion of the oil bank 600. The second oil bank 610 is further provided with a groove.

In addition, due to the increase in the oil bank, the second oil bank 610 further includes a second connection passage 560 (b) communicating with the heavy sharing passage 550 in the eccentric portion 410.

Accordingly, the friction portion between the eccentric portion and the connecting rod is a lubrication structure in which a plurality of oil flow paths are provided to supply a sufficient amount of oil, thereby reducing wear of components due to friction.

As described above in detail, the present invention improves the existing method of lubricating by the micro-gap of the eccentric portion and the connecting rod of the rotating shaft to form an oil bank in the connection flow path of the eccentric portion to lubricate and cool the friction portion more effectively. Can ensure the reliability of the compressor.

In addition, the contact surface of the eccentric portion and the connecting rod is smoothly lubricated even during the initial operation of the compressor by the oil accumulated in the oil bank, thereby preventing wear of the contact surface, thereby improving the performance of the compressor.

In addition, it is possible to prevent the phenomenon that the eccentric portion and the connecting rod is locked by forming an oil passage under the eccentric portion to discharge fine foreign matter.

Claims (15)

A sealed case, a frame accommodated in the sealed case, a lower power mechanism portion and an upper compression mechanism portion mounted to the frame, and installed in the frame to transmit the rotational force of the power mechanism portion to the compression mechanism portion, and connected to the compression mechanism portion at the top. In a hermetic compressor having a rotating shaft having an eccentric portion, and a connecting rod fastened to the eccentric portion, The hermetic compressor, characterized in that the oil bank is formed on the contact surface between the eccentric portion of the rotary shaft and the connecting rod to remain oil. The method of claim 1, The oil bank is a hermetic compressor characterized in that the groove is formed in the circumferential direction on the outer circumferential surface of the eccentric portion. The method of claim 2,  The eccentric portion of the rotary shaft is in communication with the hollow common passage and the radial direction of the eccentric portion so as to enable oil supply to the contact portion between the eccentric portion and the connecting rod open in the eccentric portion so that the oil is scattered to the top of the eccentric portion Hermetic compressor characterized in that the connection flow path is formed. The method of claim 3, The connecting channel is hermetic compressor, characterized in that the connecting channel is connected to the region where the oil bank is formed so that the oil supplied oil can remain effectively in the oil bank. The method of claim 4, wherein The outer circumferential surface of the eccentric portion is a hermetic compressor characterized in that a straight groove acting as an oil passage from the top of the oil bank to the top of the eccentric portion so that the oil flowing out of the connection flow path to the upper portion of the eccentric portion. The method of claim 5, The outer circumferential surface of the eccentric portion is a hermetic compressor, characterized in that a straight groove acting as an oil flow path from the lower end of the oil bank to the lower end of the eccentric portion so that the oil flowing into the connecting flow path flows down the eccentric portion. The method of claim 4, wherein An upper inclined groove is formed in the upper portion of the oil bank in the opposite direction to the rotation direction of the rotary shaft, and an inclined groove is formed in the oil bank, and a groove inclined in the same direction as the rotation direction of the rotary shaft is formed in the lower portion of the oil bank. Hermetic compressor characterized in that the lower inclined groove is formed to serve as an oil flow. The method of claim 2, The eccentric portion is formed with a hollow sharing path having an upper end open in the eccentric portion so that oil is scattered to the upper end of the eccentric portion, and when the piston reaches the top dead center in the cylinder on the outer circumferential surface of the eccentric portion A groove is inclined in the same direction as the rotation direction of the rotation shaft from the top of the eccentric portion to the top of the oil bank so that the oil scattered to the top of the hollow portion flows to the point where the centrifugal force is generated to the maximum in the eccentric portion Hermetic compressor. The method of claim 8, On the outer circumferential surface of the eccentric portion, when the piston reaches a top dead center in the cylinder, the rotation shaft rotates from the bottom of the oil bank to the bottom of the eccentric portion so that oil formed in the oil bank flows down to the point where centrifugal force is generated at the eccentric portion at the maximum. Hermetic compressor characterized in that the groove is formed inclined in the same direction as the direction. The method of claim 8, On the outer circumferential surface of the eccentric portion, when the piston reaches a top dead center in the cylinder, the eccentric at the bottom of the oil bank so that the oil formed in the oil bank flows down to the point where the centrifugal force is generated to the eccentric portion maximum distance apart The hermetic compressor, characterized in that a groove inclined in the same direction as the rotational direction to the lower end of the portion. According to any one of claims 8 to 10, the eccentric portion and the connecting rod is in communication with the hollow sharing passage so as to enable the oil supply portion is formed in a radial direction of the eccentric portion is formed a connection flow path connected to the oil bank Hermetic compressor, characterized in that. The method of claim 11, The eccentric portion is a hermetic compressor further comprises a second oil bank is provided with grooves in the circumferential direction on the outer peripheral surface of the eccentric portion, respectively on the upper portion of the oil bank. The method of claim 12, The eccentric unit is a hermetic compressor further comprising a second connection passage in communication with the heavy sharing passage so that the oil flowing in the hollow portion flows out into the second oil bank, the oil passage is formed in the radial direction of the eccentric portion. The method according to any one of claims 5 to 8, The eccentric unit is a hermetic compressor further comprising a second oil bank is provided with grooves in the circumferential direction on the outer peripheral surface of the eccentric portion, respectively on the upper portion of the oil bank. The method of claim 14, The eccentric unit is a hermetic compressor further comprising a second connection passage in communication with the heavy sharing passage so that the oil flowing in the hollow portion flows out into the second oil bank, the oil passage is formed in the radial direction of the eccentric portion.

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