KR20040049346A - Apparatus for fixing a shaft of hermetic compressor - Google Patents

Abstract

The present invention relates to a rotating shaft fixing device of a hermetic compressor, and has a cylinder which is fixed to the inside of the casing having an inner space that opens the upper and lower sides so that the gas is compressed, and passes through the inner space of the cylinder and transmits the driving force of the electric machine part. A rotating shaft which receives and rotates, an upper bearing and a lower bearing which are covered on the upper and lower openings of the cylinder to form an inner space of the cylinder, and which support the rotating shaft in the axial direction and the radial direction, and formed on one side of the rotating shaft The inner space of the compartment is partitioned to have at least two compression zones, and the partition plate for moving the fluid in each of the compression zones, the upper bearing and the lower bearing is coupled to the upper and lower movable and at the same time sliding on each partition plate Compresses by blocking the fluid in the compression zone and discharges it into the casing At least one vane, and a needle roller bearing mounted to at least one of the journal portion of the upper bearing or the journal portion of the lower bearing to which the rotating shaft contacts to reduce the friction force when the rotary shaft rotates. In this configuration, when the rotating shaft rotates, the friction force generated between the rotating shaft and the upper bearing and the lower bearing can be reduced.

Description

Rotary shaft fixing device of hermetic compressor {APPARATUS FOR FIXING A SHAFT OF HERMETIC COMPRESSOR}

The present invention relates to a rotating shaft fixing device of the hermetic compressor, which will be described in more detail to improve the compression performance by reducing the friction generated in the upper bearing and the lower bearing to support the rotating shaft rotated by the motor mechanism and the partition plate formed on one side It relates to a rotating shaft fixing device of the hermetic compressor.

In general, a compressor is a machine for compressing a fluid. The configuration of such a compressor includes a hermetically sealed container having a predetermined internal space, an electric machine part mounted in the hermetically sealed container to generate a driving force, and a gas driven by the driving force of the electric machine part. Compressor section for compressing.

Such compressors are generally classified into various types such as a rotary compressor, a rotary compressor, a scroll compressor, and the like according to a shape of a compression mechanism for compressing gas.

1 to 3 illustrate one of the compressors as an example, and as illustrated, the compression mechanism of the hermetic compressor having a conventional structure includes an internal space V and an internal space V thereof. The rotating shaft 20 is provided with a suction passage f1 and a discharge passage f2 communicating with each other) so as to penetrate through the center of the inner space V of the cylinder assembly D fixedly coupled to the sealed container 10. Is inserted, the rotary shaft 20 is coupled to the electric mechanism (M) for generating a driving force required for rotation.

The cylinder assembly (D) is provided with a cylindrical through hole therein and is fixed to the cylinder 30 fixed to the closed container 10 and the upper and lower surfaces of the cylinder 30 are respectively coupled with the cylinder 30 In addition to forming an inner space (V) and comprises an upper bearing 40 and a lower bearing 50 for supporting the rotating shaft 20, the cylinder 30 has an inner space of the cylinder ( In V), a suction flow path f1 radially penetrated toward the outer circumferential surface is formed.

The upper bearing 40 and the lower bearing 50 protrude to have plate portions 41 and 51 formed to have a predetermined thickness and area, and have a predetermined height and outer diameter on one surface of the plate portions 41 and 51. And the support portions 42 and 52 formed therein, and the shaft insertion holes 43 and 53 formed through the central portions of the plate portions 41 and 51 and the support portions 42 and 52, respectively. The plate portion 41 of the 40 covers the contact surface of the cylinder 30 and is coupled to the shaft insertion hole 43 such that the rotation shaft 20 is interpolated, and the lower bearing 50 is The other side of the cylinder 30 is covered, and the rotation shaft 20 is coupled to the insertion hole 53 so as to be interpolated.

The rotating shaft 20 is formed to have a predetermined outer diameter and a predetermined length is inserted into the shaft insertion hole (43. 53) of the upper bearing 40 and the lower bearing 50, and the shaft portion 21 The partition plate 22 is formed to extend on one side and partition the internal space V of the cylinder assembly D into the first space V1 and the second space V2.

The partition plate 22 of the rotating shaft 20 has a predetermined thickness, and is formed in a circular shape when viewed on a plane, and when viewed from a side, an upper convex curved portion r1 having a convex surface and a lower side having a concave surface. It consists of a concave curved surface part r2, and the connection curved surface part r3 which connects the convex curved surface part r1 and the concave curved surface part r2. That is, the partition plate 22 forms a sinusoidal waveform surface, and the convex curved portion r1 and the concave curved portion r2 are formed to have a phase difference of 180 degrees.

The first and second spaces V1a and V2a are respectively elastically supported to be in contact with both side surfaces of the partition plate 22 so that the partition plate 22 rotates. ) And the vanes 70 moving in parallel to the longitudinal direction of the rotation shaft 20 while switching to the compression zones V1b and V2b are respectively provided on the upper bearing 40 and the lower bearing 50 of the cylinder assembly D. FIG. Inserted through and combined.

The vanes 70 are coupled so as to be positioned in the same phase, that is, above and below the partition plate 22 when the cylinder assembly D is viewed in a horizontal plane, and the vanes 70 are upper bearings of the cylinder assembly D. It is inserted into the vane slots 44 and 54 formed in the 40 and the lower bearing 50, respectively.

Then, the opening and closing for discharging the compressed gas in the compression zone (V1b, V2b) of the first space (V1) and the second space (V2) while opening and closing each discharge passage (f2) formed in the cylinder assembly (D), respectively. The means 80 are coupled, and the suction pipe 90 is coupled to the hermetic container 10 so as to communicate with the suction passage f1.

Reference numeral 110 is a silencer.

The compressor configured as described above is operated as follows.

As shown in FIGS. 3 and 4, the vanes 70 of which the front end of the convex curved portion r1 of the partition plate 22 is positioned in the first space V1 and the second space V2 are respectively located. In the first position V1, the discharge of the compressed gas filled in the compression region V1b is completed and the suction of the suction region V1a is completed. In the second space V2, the gas is sucked into the suction region V2a and the gas is compressed in the compression region V2b.

Next, the partition plate 22 is rotated so that the front end of the concave curved portion r2 of the partition plate 22 is the first space V1 and the second space V2. When the vanes 70 are positioned at the positions a1 of the vanes 70, the gas is sucked into the suction region V1a in the first space V1 and the gas is compressed in the compression region V1b. In the second space V2, the discharge of the compressed gas filled in the compression region V2b is completed and the suction of the suction region V2a is completed.

As such, each time the partition plate 22 rotates in the inner space V of the cylinder assembly D, the gas is sucked, compressed, and discharged in the first space V1 and the second space V2, respectively. The operation is performed repeatedly.

However, in the hermetic compressor having the conventional structure as described above, when the rotary shaft 20 inserted into the shaft insertion holes 43 and 53 of the upper bearing 40 and the lower bearing 50 rotates, the partition plate. A rollover moment which is to be rolled over in the vertical direction by the compression pressure acting in the axial direction is generated in the 22, and the journal surface of the shaft insertion holes 43 and 53 contacting the rotating shaft 20 by the rollover moment. And wear on the outer circumferential surface of the rotating shaft 20 due to friction, and power consumption increases due to friction, thereby degrading compression performance.

The object of the present invention devised in view of the above point is to provide a rotating shaft fixing device of the hermetic compressor to improve the compression performance by reducing the frictional force generated in the journal surface of the upper bearing and the lower bearing on which the rotating shaft is supported. have.

1 is a longitudinal sectional view showing a compression mechanism of a typical compressor;

2 is a plan view showing the compression mechanism of the compressor shown in FIG.

3 is a perspective view partially showing a compression mechanism of the compressor shown in FIG. 1;

4 and 5 are a plan view showing a process of operating the compression mechanism of the compressor shown in FIG.

Figure 6 is a longitudinal sectional view showing the internal structure of a hermetic compressor equipped with a rotating shaft fixing device of an embodiment of the present invention,

Figure 7 is a perspective view showing a rotating shaft support of the hermetic compressor of one embodiment of the present invention.

** Description of the symbols for the main parts of the drawings **

20: shaft 140: upper bearing

141: plate portion 142: support portion

143: shaft insertion hole 143a: upper insertion groove

144: vane slot 145: needle roller bearing

145a: Roller 150: Lower Bearing

151: plate portion 152: support portion

153: shaft insertion hole 154: vane slot

155: needle roller bearing 155a: roller

The rotating shaft fixing device of the hermetic compressor for achieving the object of the present invention as described above has a cylinder which is fixed to the inside of the casing having an inner space that opens the upper and lower sides so that the gas is compressed, and penetrates the inner space of the cylinder and is electric A rotating shaft that is rotated by receiving a driving force of the mechanism, an upper bearing and a lower bearing which are covered on the upper and lower openings of the cylinder to form an inner space of the cylinder and support the rotating shaft in the axial direction and the radial direction; A partition plate formed on one side to partition the inner space of the cylinder to have at least two compression zones, and to move the fluid in each compression zone, and to be movably coupled to the upper bearing and the lower bearing to be mounted on the partition plate. After sliding, the fluid in each compression zone is blocked and compressed At least one vane to be discharged into the sink, and at least one of the journal portion of the upper bearing or the journal portion of the lower bearing in contact with the rotary shaft to reduce the friction force when the rotary shaft rotates. It consists of a needle roller bearing mounted.

DETAILED DESCRIPTION Hereinafter, a rotating shaft fixing device of a hermetic compressor, which is one embodiment of the present invention, will be described in detail with reference to the accompanying drawings.

Figure 6 is a longitudinal cross-sectional view showing the internal structure of a hermetic compressor equipped with a rotating shaft fixing device of an embodiment of the present invention, Figure 7 is a perspective view showing a rotating shaft support of the hermetic compressor of an embodiment of the present invention, as shown As described above, the hermetic compressor equipped with the rotating shaft fixing device according to an embodiment of the present invention has an inner space V and an inlet flow path f1 and a discharge flow path f2 communicating with the inner space V, respectively. The rotating shaft 20 is inserted into the inner space (V) of the cylinder assembly (D) which is fixedly coupled to the hermetic container (10), the rotating shaft 20 is an electric mechanism unit for generating a driving force necessary for rotation ( M)

The cylinder assembly (D) is provided with a cylindrical through hole therein and is fixed to the cylinder 30 fixed to the closed container 10 and the upper and lower surfaces of the cylinder 30 are respectively coupled with the cylinder 30 In addition to forming an inner space (V) and comprises an upper bearing 140 and a lower bearing 150 for supporting the rotating shaft 20, the cylinder 30 has an inner space of the cylinder ( In V), a suction flow path f1 radially penetrated toward the outer circumferential surface is formed.

The upper bearing 140 and the lower bearing 150 protrude to have plate portions 141 and 151 formed to have a predetermined thickness and area, and have a predetermined height and outer diameter on one surface of the plate portions 141 and 151. And axial insertion holes 143 and 153 formed through the central portions of the plate parts 141 and 151 and the support parts 142 and 152. The plate portion 141 of the 140 covers the contact surface of the cylinder 30 and is coupled to insert the rotation shaft 20 into the shaft insertion hole 143, and the lower bearing 150 The rotation shaft 20 is inserted into the insertion hole 153 and inserted into the other side of the cylinder 30.

At this time, the upper insertion groove 143a, which is an insertion groove recessed in a predetermined width and depth, is formed in the journal surface in contact with the rotary shaft 20 inserted into the shaft insertion hole 143 of the upper bearing 140, A needle roller bearing 145 is inserted and supported in the upper insertion groove 143a, and a plurality of rollers 145a mounted on the inner circumferential surface of the needle roller bearing 145 are lined with the outer circumferential surface of the rotation shaft 20. Contact and rotate on its own. Similarly, a lower insertion groove 153a, which is an insertion groove recessed in a predetermined width and depth, is formed in the journal surface in contact with the rotary shaft 20 inserted into the shaft insertion hole 153 of the lower bearing 150, Needle roller bearings 155 are inserted and supported in the lower insertion grooves 153a, and a plurality of rollers 155a mounted on the inner circumferential surface of the needle roller bearings 155 are in line contact with the outer circumferential surface of the rotating shaft 20. And rotate on its own.

The rotating shaft 20 is formed to have a predetermined outer diameter and a predetermined length and is inserted into the shaft insertion holes 143 and 153 of the upper bearing 140 and the lower bearing 150, and the shaft portion 21. A partition plate 22 extending from one side thereof and partitioning the internal space V of the cylinder assembly D into the first space V1 and the second space V2 is provided.

The partition plate 22 of the rotating shaft 20 has a predetermined thickness, and is formed in a circular shape when viewed on a plane, and when viewed from a side, an upper convex curved portion r1 having a convex surface and a lower side having a concave surface. It consists of a concave curved surface part r2, and the connection curved surface part r3 which connects the convex curved surface part r1 and the concave curved surface part r2. That is, the partition plate 22 forms a sinusoidal waveform surface, and the convex curved portion r1 and the concave curved portion r2 are formed to have a phase difference of 180 degrees.

In addition, the first and second spaces V1a and V2a are respectively elastically supported to be in contact with both side surfaces of the partition plate 22 so that the partition plate 22 rotates. ) And the vanes 70 moving in parallel to the longitudinal direction of the rotating shaft 20 while switching to the compression zones V1b and V2b are formed in the upper bearing 140 and the lower bearing 150 of the cylinder assembly D. FIG. The vane slots 144 and 154 are inserted into and coupled to the vane slots 144 and 154, respectively.

Then, the opening and closing for discharging the compressed gas in the compression zone (V1b, V2b) of the first space (V1) and the second space (V2) while opening and closing each discharge passage (f2) formed in the cylinder assembly (D), respectively. The means 80 are coupled, and the suction pipe 90 is coupled to the hermetic container 10 so as to communicate with the suction passage f1.

Reference numeral 110 is a silencer.

The process of operating the hermetic compressor configured as described above is the same as the conventional one, and the rotary shaft 20 having the partition plate 22 formed on one side by the electric mechanism unit M rotates to suck, compress and discharge the gas. At the time, an overturning moment is generated in a direction perpendicular to the journal surfaces of the upper bearing 140 and the lower bearing 150 supporting the rotating shaft 20 due to the pressure acting in the axial direction on the partition plate 22. At this time, the roller 145a of the needle roller bearing 145 mounted on the journal surface of the upper bearing 140 in contact with the outer circumferential surface of the rotating shaft 20 inserted into the shaft insertion hole 143 of the upper bearing 140. Is rotated by itself is to reduce the friction generated between the upper bearing 140 and the rotating shaft 20. Similarly, when the rotation shaft 20 rotates and a rollover moment is generated, the stirring of the lower bearing 150 in contact with the outer circumferential surface of the rotation shaft 20 inserted into the shaft insertion hole 153 of the lower bearing 150 is performed. The roller 155a of the needle roller bearing 155 mounted on the board surface rotates by itself, thereby reducing the friction force generated between the lower bearing 15 and the rotating shaft 20.

As described above, the rotary shaft fixing device of the hermetic compressor according to the present invention has rollers 145a of the needle roller bearings 145 and 155 mounted on the journal surface of the upper bearing 140 and the journal surface of the lower bearing 150 at the time of rotation. As the support shaft 155a rotates itself while supporting the rotation shaft 20, the rotational force generated between the rotation shaft 20, the upper bearing 140, and the lower bearing 150 due to an overturning moment generated in the rotation shaft 20 is generated. Friction is reduced.

As described above, the rotating shaft fixing device of the hermetic compressor according to the present invention is provided with the upper insertion groove formed on the journal surface of the upper bearing and the lower insertion groove formed on the journal surface of the lower bearing when the rotating shaft rotates by receiving the rotation force generated from the electric mechanism part. As the roller of the mounted needle roller bearing supports the rotating shaft and rotates itself, the rolling force generated between the rotating shaft and the upper bearing and the lower bearing is reduced due to the overturning moment generated in the rotating shaft, thereby causing wear of the rotating shaft. It is possible to shorten the lifespan of the parts and to increase the power consumption due to friction.

Claims (2)

A cylinder fixed to the inside of the casing with an inner space that opens the upper and lower sides so that the gas is compressed; A rotating shaft that penetrates the inner space of the cylinder and is rotated by receiving a driving force of the electric mechanism unit; An upper bearing and a lower bearing which are covered on the upper and lower openings of the cylinder to form an inner space of the cylinder and simultaneously support the rotating shaft in the axial direction and the radial direction; A partition plate formed at one side of the rotation shaft to partition the inner space of the cylinder to have at least two compression zones and to move the fluid in each compression zone; At least one vane coupled to the upper bearing and the lower bearing to be movable upward and downward and at the same time sliding on the partition plate to block and compress the fluid in each compression region and to be discharged into the casing; Sealed type comprising a needle roller bearing mounted to reduce the friction force in at least one of the journal portion of the upper bearing, or the journal portion of the lower bearing to which the rotary shaft is in contact so that the friction force is reduced when the rotary shaft is rotated. Rotor fixing device of the compressor. The method of claim 1, wherein at least one of the upper bearing or the lower bearing is formed with an insertion groove recessed in a predetermined width and depth so that the needle roller bearing can be inserted into the journal portion in contact with the rotating shaft. Rotation shaft fixing device of the hermetic compressor characterized in that it is.