KR100343727B1 - Structure for supporting crankshaft of scroll compressor - Google Patents

Abstract

The present invention relates to a drive shaft support structure of a scroll compressor, the present invention is to form a conical housing having a predetermined depth so that the lower end of the drive shaft is inserted into the bottom surface of the casing closely supported in the radial direction, the inner peripheral surface or An oil flow path groove is formed on the outer circumferential surface of the drive shaft so that the oil in the casing flows in between the outer circumferential surface of the casing, so that the lower frame supporting the lower end of the drive shaft can be removed, making the structure simple and easy to assemble. The cost is reduced.

Description

Drive shaft support structure of scroll compressor {STRUCTURE FOR SUPPORTING CRANKSHAFT OF SCROLL COMPRESSOR}

The present invention relates to a drive shaft support structure of a scroll compressor, and more particularly to a structure of a lower cap forming part of a casing.

Generally, a compressor converts mechanical energy into compressive energy of a compressive fluid, which is divided into reciprocating, scrolling, and centrifugal (commonly referred to as turbo) and vane (commonly referred to as rotary). .

Among the scroll compressors, unlike the reciprocating type using the linear motion of the piston, the scroll compressor sucks and discharges the gas by using a rotating body such as a centrifugal type or a vane type. The scroll compressor is divided into a low pressure scroll compressor or a high pressure scroll compressor depending on whether suction gas or discharge gas is filled in the casing.

In the low pressure scroll compressor, as shown in FIG. 1, the upper frame 2 and the lower frame 3 are respectively fixed to upper and lower sides of the inner circumferential surface of the casing 1 filled with oil to an appropriate height, and the upper frame 2 A driving motor 4 consisting of a stator 4A and a rotor 4B is fixedly installed between the lower frame 3 and the lower frame 3, and a driving shaft 5 is formed at the center of the rotor 4B of the driving motor 4. The pivoting frame 6 is press-fitted through the upper frame 2, and the upper frame 2 is formed on the upper surface with a wrap 6a in an involute curve to be eccentrically coupled to the drive shaft 5. A fixed scroll which is rotatably mounted and provided with an involute curve wrap 7a formed on the upper surface of the swing scroll 6 to be engaged with the wrap 6a of the swing scroll 6 to form a plurality of compression chambers ( 7) is fixed to the edge of the upper frame (2), the casing (top) of the fixed scroll (7) 1) A high and low pressure separator 8 partitioning the inside into a discharge pressure region as a high pressure portion and a suction pressure region as a low pressure portion is fixed to an inner circumferential surface of the casing 1.

At one outer periphery of the fixed scroll (7) is formed a suction groove (7b) in communication with the suction pipe (SP) to the inside of the outermost wrap, the center of the fixed scroll (7) is in communication with the discharge pipe (DP) A discharge port 7c is formed, and a check valve assembly 9 for opening and closing the discharge port 7c is provided at the front end surface of the fixed scroll 7.

The casing 1 includes a main casing 1A to which the upper frame 2 and the lower frame 3 including the stator 4A of the drive motor 4 are fixed, and upper and lower end surfaces of the main casing 1A. The upper cap 1B and the lower cap 1C are covered.

In the figure, 5a, which is not described, is an oil oil, and 8a is a gas discharge hole.

The conventional scroll compressor configured as described above operates as follows.

That is, while the rotor 4B rotates together with the drive shaft 5 inside the stator 4A by the applied power, the turning scroll 6 is eccentrically rotated by an eccentric distance, and the turning scroll ( 6) is rotated by the distance from the center of the shaft by the Old Daming (unsigned) as the turning radius, and a plurality of compression chambers are formed between the two wraps (6a, 7a) with the fixed scroll (7). This compression chamber is moved to the center by the continuous swinging motion of the swinging scroll 6, and the volume is reduced to further compress and discharge the sucked refrigerant gas.

At this time, the driving shaft 5 is inserted into the through hole (unsigned) of the upper frame 2 and supported in the radial direction, and the lower part is inserted into the through hole (unsigned) of the lower frame 3 At the same time, it was supported together in the axial direction by the self-centering bearing 10 pressed radially and pressed into the lower end of the through hole.

However, in the conventional scroll compressor as described above, a separate lower frame 3 must be provided to support the lower end of the drive shaft 5, so that the complexity of the structure, the difficulty of assembling, and the increase in manufacturing cost are increased due to the increase in the number of parts. The back became a problem.

The present invention has been made in view of the problems of the conventional scroll compressor as described above, by simplifying the structure for supporting the drive shaft to simplify the structure, facilitate assembly and reduce the manufacturing cost of the drive shaft support structure of the scroll compressor The purpose is to provide.

1 is a longitudinal sectional view showing an example of a conventional scroll compressor.

Figure 2 is a longitudinal sectional view showing the lower half of the scroll compressor of the present invention.

3 is a detailed view showing part "A" of FIG.

4 is a cross-sectional view taken along the line “I-I” of FIG. 3.

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

100 casing 120 lower cap

121: celebration housing 121a: oil euro home

200: drive shaft 210: oil euro

220: oil euro home

In order to achieve the object of the present invention, a circulating housing having a predetermined depth is formed in the bottom surface of the casing so that the lower end of the drive shaft is closely inserted and supported in a radial direction, and the oil in the casing is formed on the inner circumferential surface of the celebration housing or on the outer circumferential surface of the driving shaft. The drive shaft support structure of the scroll compressor is provided so that the oil flow path groove is formed so that it may flow in between this shaft outer peripheral surface.

Hereinafter, the driving shaft support structure of the scroll compressor according to the present invention will be described in detail with reference to the embodiment shown in the accompanying drawings.

Figure 2 is a longitudinal sectional view showing the lower half of the scroll compressor of the present invention, Figure 3 is a detailed view showing the "A" part of Figure 2, Figure 4 is a sectional view taken along the line "I-I" of FIG.

As shown in the scroll compressor having a drive shaft support structure according to the present invention, the stator 4A of the drive motor 4 is fixed inside the casing 100, and is disposed inside the stator 4A. At the center of the rotor 4B is driven a drive shaft 200 for transmitting a driving force to the turning scroll (shown in Figure 1), the upper end of the drive shaft 200 is fixed to the casing 100, the upper frame (see Figure 1) The lower end of the drive shaft 200 is inserted into and supported in the housing housing 121 of the casing 100 to be described later.

The casing 100 includes a main casing 110 to which the upper frame including the stator of the driving motor 4 is fixed, an upper cap (shown in FIG. 1) covering the upper end of the main casing 110, and the main The lower cap 120 covers the lower end of the casing 110.

At the center of the lower cap 120, the conical housing 121 is bent to have a predetermined depth, and the bottom surface of the conical housing 121 is self-centered to reduce friction with the lower surface of the drive shaft 200. The bearing 300 is interposed.

On the inner wall surface of the celebratory housing 121, the oil flow path groove 121a is such that oil in the casing 100 passes between the inner wall surface of the celebratory housing 121 and the outer circumferential surface of the drive shaft 200 and flows into the oil channel 210. ) Is formed. The oil channel groove 121a may be formed to be vertically long and may be formed to be inclined downward in a forward direction with respect to the rotational direction of the drive shaft 200 or may be formed in a spiral shape. In addition, the oil channel groove 220 may be formed on the outer circumferential surface of the drive shaft 200, or may be formed together on the inner wall surface of the celebration housing 121 and the outer circumferential surface of the drive shaft 200.

In the drawings, the same reference numerals are given to the same parts as in the prior art.

The general operation of the scroll compressor having the drive shaft support structure as described above is the same as in the prior art.

That is, while the driving shaft 200 rotates together with the rotor 4B of the motor rotated by the applied power, the eccentric rotation of the turning scroll (not shown) by the eccentric distance is performed. Refrigerant filled in the low pressure part of the casing 100 by forming a plurality of compression chambers between the two wraps (shown in FIG. 1) with the fixed scroll (shown in FIG. 1) at a distance separated by the turn radius. The gas is sucked and compressed to be discharged to the discharge port (shown in FIG. 1) of the fixed scroll.

At this time, the lower end of the drive shaft 200 is inserted into the rotating housing 121 of the lower cap 120 is rotated, but the oil channel groove 121a on the inner wall surface or the outer peripheral surface of the driving shaft 200 of the celebration housing 121 , 220 is formed so that the oil in the casing 100 is sucked into the oil channel 210 of the drive shaft 200 along the oil channel grooves 121a and 220, and the oil sucked into the oil channel 210 is oil. It is sucked up through the flow path 210 and is supplied to each sliding surface.

On the other hand, since the lower end of the drive shaft 200 is supported by the conical housing 121 provided in the lower cap 120, there is no need for a separate lower frame for supporting the lower end of the drive shaft 200, thereby Of course, the structure itself is simplified, as well as the assembly process is removed for the lower frame during assembly, the assembly operation is easy, and the manufacturing cost for the lower frame is reduced.

In the drive shaft support structure of the scroll compressor according to the present invention, a axial housing having a predetermined depth is formed on the bottom surface of the casing so that the lower end of the drive shaft is tightly inserted in the radial direction, and the circumferential surface of the axial housing or the outer peripheral surface of the drive shaft is formed. The oil flow path groove is formed so that the oil in the casing flows in between the outer peripheral surface of the casing, so that the lower frame supporting the lower end of the drive shaft can be removed, thereby simplifying the structure and assembling and reducing the manufacturing cost. It works.

Claims (3)

On the bottom surface of the casing, the lower end of the drive shaft is tightly inserted to form a axial housing having a predetermined depth so as to be supported in the radial direction, and the oil in the casing flows in between the outer circumferential surface of the shaft and the inner circumferential surface of the axial housing Drive shaft support structure of the scroll compressor, characterized in that the flow path groove is formed. According to claim 1, At least one oil passage groove is formed at least one vertically or at least one formed to be inclined toward the lower axis in the forward direction with respect to the rotational direction of the drive shaft, or the lower end of the shaft in the forward direction with respect to the rotational direction of the drive shaft A drive shaft support structure of a scroll compressor, characterized in that it is formed spirally wound to face. The drive shaft support structure of a scroll compressor according to claim 1, wherein a self-centering bearing is interposed between the bottom surface of the celebration housing and the bottom surface of the drive shaft.