KR100390421B1 - High pressure type scroll compressor with radial compliance structure - Google Patents

Abstract

SUMMARY OF THE INVENTION An object of the present invention is to provide a radially compliant structure in a high pressure scroll compressor to maintain compliance with the inflow of incompressible fluid and to maintain an axial gap between the scrolls.

To this end, the present invention is a casing to maintain a high pressure state, the rotating scroll and the fixed scroll provided in the casing to partition the compression chamber, and the rotating scroll to maintain a narrow axial gap between the rotating scroll and the fixed scroll A high pressure scroll compressor comprising a frame for partitioning a medium pressure back pressure chamber together; An eccentric shaft comprising a rod slidably supported on the frame and a pin portion eccentrically provided on an upper end of the rod portion, and provided between an outer surface of the pin portion and a boss inner circumferential surface of the pivoting scroll, incompressible material flows into the compression chamber. It provides a high-pressure scroll compressor comprising a radially compliant structure that spaces the wrap of the swing scroll and the wrap of the fixed scroll.

Description

High pressure type scroll compressor with radial compliance structure

The present invention relates to a high pressure scroll compressor, and more particularly, to a high pressure scroll compressor having a radially compliant structure to prevent contact between the liquid refrigerant into the compression chamber and the scroll when foreign matters.

In general, a scroll compressor is a compressor that compresses refrigerant gas by changing a volume of a compression chamber formed by a pair of opposed scrolls, and has a higher efficiency, lower vibration and noise than a reciprocating compressor and a rotary compressor. In addition, it is possible to reduce the size and weight of the Braille is expanding the use area.

Here, the high-pressure scroll compressor, as shown in Figure 1 and 2, the casing 10 to maintain a high pressure state, and the rotating scroll 20 is provided in the casing and partitions the compression chamber 20a in engagement with each other. ) And a fixed scroll (30), and a frame (40) for partitioning the intermediate pressure back pressure chamber (40a, 背壓 室) together with the swing scroll to maintain a narrow axial gap between the swing scroll and the fixed scroll. One end is rotatably fastened to the boss 21 of the swing scroll, and the other end is fastened to the prime mover 50, and an eccentric shaft 60 which transmits a driving force to the swing scroll and rotation of the swing scroll are prevented. The oldham ring (70), which swings in place, is included.

The high pressure scroll compressor made as described above performs the following operation.

When power is supplied to the high pressure scroll compressor, an induction current is generated between the stator 51 and the rotor 52 of the prime mover 50, and the eccentric shaft 60 coupled to the rotor by the induction current. ) Rotates, the turning scroll 20 is rotated by the rotation of the eccentric shaft.

At this time, the refrigerant gas is introduced into the compression chamber (20a) through the suction pipe (80) and the suction port (not shown) formed on one side of the fixed scroll, by the swinging movement of the turning scroll (20) of the compression chamber It is compressed while moving to the center, and after being compressed, it is discharged through the discharge port 31 formed in the center side of the fixed scroll (30). At this time, the inside of the casing 10 is in a high pressure state by the discharged high pressure refrigerant gas, the high pressure refrigerant gas is discharged to the discharge pipe 90 provided on one side of the casing.

In addition, as the high-pressure refrigerant gas in the casing pressurizes the oil 11 located below the casing 10, the oil subjected to the pressing force is provided along the eccentric shaft 60 along the oil passage 61 of the eccentric shaft. Flow to the fastening portion of the swing scroll 20 to minimize the friction of the fastening portion.

However, the high pressure scroll compressor of the prior art has the following problems.

The compression chamber 20a is composed of several crescent shaped space portions formed between the wrap scroll 22 and the fixed scroll wrap 32, and the "R" value of each scroll wrap toward the center. As this becomes smaller, the volume of the space portion becomes correspondingly smaller. Therefore, the refrigerant gas introduced into the compression chamber is compressed while decreasing in volume toward the center of the compression chamber. However, when a refrigerant or oil in a liquid state, not a refrigerant in a gaseous state, flows into the compression chamber, there is a problem that the device does not operate normally and is damaged.

That is, since the liquid refrigerant and the oil are incompressible fluids, the volume change cannot be made, and when the refrigerant does not comply with the volume change of the compression chamber 20a during compression, the wrap scroll 22 and the fixed scroll It caused the wrap 32 to be damaged, or the torsion stress was concentrated on the prime mover 50 or the eccentric shaft 60.

SUMMARY OF THE INVENTION The present invention has been made to solve the problems of the prior art, and is provided with a radially compliant structure in a high-pressure scroll compressor, to maintain compliance with the inflow of incompressible fluid, and to maintain an axial gap between scrolls.

1 is a cross-sectional view showing the configuration of a general high pressure scroll compressor.

Figure 2 is a detail view "A" part of Figure 1 according to the prior art.

3 is a cross-sectional view showing main parts of a first embodiment of a radially compliant structure and an eccentric shaft applied thereto according to the present invention;

4 is a cross-sectional view illustrating main parts of a second embodiment of a radially compliant structure and an eccentric shaft according to the present invention;

Fig. 5a is a cross sectional view showing a main portion of a sealing structure of a first embodiment applied to a radially compliant structure according to the present invention;

Figure 5b is a cross-sectional view showing the main portion of the sealing structure of the second embodiment applied to the radial compliance structure according to the present invention.

Fig. 5C is a cross sectional view showing a main portion of a sealing structure of a third embodiment applied to a radially compliant structure according to the present invention;

Fig. 5D is a cross sectional view showing a main portion of a sealing structure of a fourth embodiment applied to a radially compliant structure according to the present invention;

Figure 6a is a cross-sectional view showing a first embodiment of a radially compliant structure applied to the high pressure scroll compressor according to the present invention.

6B is a cross-sectional view of a second embodiment of a radially compliant structure applied to a high pressure scroll compressor in accordance with the present invention.

Figure 6c is a cross-sectional view showing a third embodiment of the radially compliant structure applied to the high pressure scroll compressor according to the present invention.

Explanation of symbols for main parts of the drawings

10: casing 20: turning scroll

21: Turning Scroll Boss 22: Turning Scroll Wrap

20a: compression chamber 30: fixed scroll

32: fixed scroll wrap 40: frame

40a: back pressure chamber 100: eccentric shaft

110: sealing 120: pin

130: protrusion 200: radially compliant structure

211, 212: rib 210, 240: body

220: long hole 230: elastic body

250: eccentric hole 300: sealing member

In order to achieve the above object, the present invention provides a casing for maintaining a high pressure state, the rotating scroll and the fixed scroll provided in the casing to partition the compression chamber, and to maintain a narrow axial gap between the rotating scroll and the fixed scroll A high pressure scroll compressor having a frame for partitioning a back pressure chamber of medium pressure together with the turning scroll; An eccentric shaft comprising a rod slidably supported on the frame and a pin portion eccentrically provided on an upper end of the rod portion, and between an outer surface of the pin portion and a boss inner circumferential surface of the pivoting scroll, when an incompressible material is introduced into the compression chamber. It provides a high-pressure scroll compressor characterized in that it comprises a radially compliant structure to space the wrap of the rotating scroll and the wrap of the fixed scroll.

Referring to the drawings to describe the above content in more detail as follows.

Figure 3 is a cross-sectional view of the main portion showing a first embodiment of the radial compliance structure and the eccentric shaft applied to the present invention, Figure 4 is a second embodiment of the radial compliance structure and the eccentric shaft applied thereto according to the present invention It is sectional drawing of main part.

5A is a cross-sectional view showing main parts of a sealing structure of a first embodiment applied to a radial compliance structure according to the present invention, and FIG. 5B shows a sealing structure of a second embodiment applied to a radial compliance structure according to the present invention. Fig. 5C is a sectional view showing the essential parts of the third embodiment applied to the radially conforming structure according to the present invention, and Fig. 5D is a sealing structure of the fourth embodiment to be applied to the radially conforming structure according to the present invention. It is a sectional view showing main parts.

6A is a cross-sectional view showing a first embodiment of a radially compliant structure applied to the high pressure scroll compressor according to the present invention, and FIG. 6B is a cross sectional view of the radially adapted structure applied to the high pressure scroll compressor according to the present invention. 6 is a cross-sectional view showing a third embodiment of a radially compliant structure applied to the high-pressure scroll compressor according to the present invention.

High pressure scroll compressor having a radially compliant structure of the present invention, as shown in Figure 3, the casing (see 10 in Fig. 1) to maintain a high pressure state, and the compression chamber provided in the casing (see 20a in Figure 1) 1) and a rotating scroll (see 20 in FIG. 1) and a fixed scroll (see 30 in FIG. 1), and a medium pressure back pressure together with the turning scroll to maintain a narrow axial gap between the turning scroll and the fixed scroll. A frame (see 40 in FIG. 1, FIG. 1) partitioning the seal (see FIG. 1, 40a), a rod portion 110 slidably supported on the frame, and a pin portion 120 eccentrically provided on the top of the rod portion. It is provided between the eccentric shaft 100 and the outer surface of the pin portion and the inner circumferential surface of the boss 21 of the swinging scroll, the wrap of the swinging scroll when the coolant liquid, oil or foreign matter enters into the compression chamber. Reference) and the fixed scroll (See Fig. 32 in Fig. 1) is made includes a radially compliant structure 200 that spaced apart from each other.

At this time, in order to elevate the eccentric shaft 100 by using pressure applied to the upper end of the pin portion 120 and the lower end of the rod 110, the cross-sectional area of the pin portion is smaller than the cross-sectional area of the rod portion. desirable. In addition, as shown in FIG. 4, a protrusion 130 protruding in a radial direction on a top outer circumferential surface of the rod portion may be further provided such that a lower end of the radial compliance structure 200 corresponds to an upper end of the rod portion 110. Can be.

In addition, the radially compliant structure 200, as shown in Figure 6a, the body 210 is rotatably mounted to the inner peripheral surface of the boss 21 of the swing scroll, and the pin portion 120 is inserted / left / It is preferable that a long long hole 220 is formed in the body so as to slide to the right.

Radial compliant structure according to the present invention made as described above performs the following operation.

First, in the normal compression in which only the refrigerant gas flows into the compression chamber (20a in FIG. 1), the eccentric shaft pin portion 120 is rotated in a circular shape, and the long hole portion (220 in FIG. 6a) is formed by the centrifugal force of the pin portion. ) Slides along the pin portion so that the radially compliant structure 200 is moved in the centrifugal force direction. And the radial compliance structure is rotated with the pin portion and at the same time rotated on the inner peripheral surface of the boss 21 of the turning scroll. Therefore, the turning scroll 20, which is prevented from rotating by the Old Daming (70 in FIG. 1), turns to compress the refrigerant gas.

In addition, the high pressure refrigerant gas discharged from the compression chamber (20a of FIG. 1) pressurizes the oil provided at the lower end of the casing (10 of FIG. 1) to flow into the oil channel 140 of the eccentric shaft, Lift to the top. The elevated oil maintains the same pressure as that of the refrigerant gas and is discharged to the upper end of the fin part. In this case, the discharged high pressure oil presses the upper end of the fin part 120 and the upper end of the radial direction conforming structure 200 downward, and at the same time, the refrigerant gas of the high pressure moves the lower end of the sealing part 110 upward. Since the pressure is applied, the eccentric shaft 100 is subjected to an upward force by the cross sectional area difference between the rod 110 and the pin 120.

At the same time, the upper end of the radial compliance structure 200 is pressurized by the oil of high pressure, while the lower end of the radial compliance structure is located in the back pressure chamber (40a of FIG. The Lions will receive downward force.

Accordingly, the lower end of the radial compliance structure 200 and the upper end of the rod 110 are tightly sealed by the force so that the high pressure oil does not flow into the back pressure chamber 40a of FIG. 1. Accordingly, the back pressure chamber can maintain the intermediate pressure as it is to maintain the axial gap between the turning scroll 20 and the fixed scroll (30 in FIG. 1).

Second, in the case of abnormal compression in which a liquid refrigerant, oil, or foreign matter, which is an incompressible material, is introduced into the compression chamber (20a in FIG. 1), the turning scroll 20 engaged with the fixed scroll (30 in FIG. 1) is radially moved. In this case, since the long hole portion 220 of the radially compliant structure slides along the pin portion 120, the radially compliant structure 200 is moved in the radial direction. That is, the fixed scroll and the orbiting scroll are radially spaced to correspond to the volume of the incompressible material. Therefore, the incompressible material is discharged from the compression chamber, and the above-mentioned normal compression process is performed again.

In addition, the abnormal axial compression also receives the same axial force as in the normal compression. Accordingly, the lower end of the radial compliance structure 200 and the upper end of the rod 110 are tightly sealed by the force so that the high pressure oil does not flow into the back pressure chamber 40a of FIG. 1. Accordingly, the back pressure chamber can maintain the intermediate pressure as it is to maintain the axial gap between the turning scroll 20 and the fixed scroll 30 as it is.

On the other hand, to add a variety of embodiments in order to more preferably implement the radial compliance structure according to the present invention as follows.

First, as shown in Figure 5a, it is preferable that the rib 211 is further formed on the outer peripheral bottom surface of the radial compliance structure 200.

The reason is that in order for the lower end of the radial compliance structure 200 and the upper end of the rod 110 to be tightly sealed, the lower end surface of the radial applicator and the upper end surface of the rod must be precisely ground, but when grinding, the upper end of the rod Due to the interference of the pin 120 provided in the, the machining time is long, and the precision machining becomes difficult. As a result, only the top surface separated from the upper end surface of the pin portion side is precisely ground to reduce the machining time, and to keep the sealing effect intact by keeping the rib 211 in close contact with the grinding surface.

Second, as shown in Figure 5b, the rib 212 is preferably formed on the inner peripheral bottom surface of the radial compliance structure 200 is further formed.

The reason is that when the rib 212 of the radial compliance structure and the upper end of the rod 110 are in close contact, the bottom surface of the radial compliance structure is in communication with the back pressure chamber (40a of FIG. 1). The pressure difference between the top and bottom is clearly distinguished. This is because the pressure difference increases the sealing force between the radially compliant structure and the rod, thereby improving the reliability of the device.

Third, as shown in FIGS. 5C and 5D, a separate sealing member 300 is further included between the bottom surface of the radial compliance structure 200 and the top surface of the rod 110. Do.

The reason is that since the bottom surface of the radially compliant structure 200 and the top surface of the rod 110 is tightly sealed without precise grinding, the processing time can be reduced and the impact and friction between members can be reduced. to be.

At this time, the sealing member 300 is inserted into and fixed to the lower end of the radially compliant structure 200, as shown in Figure 5c, or as shown in the upper surface of the rod 110 as shown in Figure 5d It is preferably inserted and fixed. And the sealing member is preferably made of Teflon material.

On the other hand, the radial compliance structure 200 according to the present invention can be made in the following embodiments.

First, the radial compliance structure 200, as shown in Figure 6a, the body 210 is rotatably mounted on the inner circumferential surface of the boss 21 of the swing scroll, and the pin portion 120 is inserted / left / An elongated long hole may be formed in the body so as to slide to the right, and as shown in FIG. 6B, an elastic body 230 for elastically connecting the inner surface of the long hole part and the pin part may be further included. Can be.

Second, the radial compliance structure 200, as shown in Figure 6c, the body 240 is rotatably mounted to the inner peripheral surface of the boss 21 of the swing scroll, and the pin portion is inserted into a circular arc left / An eccentric hole 250 may be formed in the body to move right.

So far, the present invention has been described with reference to the preferred embodiments, and those skilled in the art to which the present invention pertains to the detailed description of the present invention and other forms of embodiments within the essential technical scope of the present invention. Could be implemented. Herein the essential technical scope of the present invention is shown in the claims.

As described above, the present invention is provided with a radially compliant structure in the high-pressure scroll compressor, has the following effects.

First, even when liquid refrigerant, oil, or other incompressible foreign matter flows into the compression chamber, since the turning scroll smoothly turns in a radial direction, it is possible to prevent damage to the device, which was a conventional problem.

Second, since the pressure state of the back pressure chamber, which is an axially compliant structure, can be maintained as it is, the axial gap between the scrolls can be secured to its original state, thereby ensuring the reliability of the device.

Third, it is possible to reduce the cross-sectional area of the pin portion of the eccentric shaft made of expensive high-strength steel material, thereby reducing the cost.

It also encompasses all the effects mentioned in the detailed description of the invention.

Claims (14)

A casing that maintains a high pressure state, a turning scroll and a fixed scroll provided in the casing to define a compression chamber, and an intermediate pressure back pressure together with the turning scroll to maintain a narrow axial gap between the turning scroll and the fixed scroll. In the high-pressure scroll compressor provided with a frame for partitioning the seal, An eccentric shaft comprising a rod portion slidably supported on the frame and a pin portion eccentrically provided on an upper end of the rod portion, wherein a cross sectional area of the pin portion is smaller than a cross sectional area of the rod portion; It is provided between the outer surface of the pin portion and the boss inner circumferential surface of the revolving scroll, characterized in that it comprises a radially compliant structure to separate the lap of the rotating scroll and the lap of the fixed scroll when incompressible material flows into the compression chamber High Pressure Scroll Compressor. delete The method of claim 1, High-pressure scroll compressor, characterized in that the protrusion further protruding in the radial direction on the outer peripheral surface of the upper end of the rod. The method according to claim 1 or 3, And a rib is further formed on an outer circumferential bottom surface of the radially compliant structure. The method according to claim 1 or 3, High pressure scroll compressor characterized in that the rib is further formed on the inner peripheral bottom surface of the radial compliance structure. The method according to claim 1 or 3, High pressure scroll compressor characterized in that the sealing member is further included between the bottom surface of the radial compliance structure and the top surface of the rod. The method of claim 6, The sealing member is a high-pressure scroll compressor, characterized in that fixed to be inserted into the lower end of the radially compliant structure. The method of claim 6, The sealing member is a high-pressure scroll compressor, characterized in that the insert is fixed to the top surface of the rod. The method of claim 6, The sealing member is a high pressure scroll compressor, characterized in that made of Teflon material. delete The method according to claim 1 or 3, The radially compliant structure; A high-pressure scroll compressor, characterized in that the body is rotatably mounted on the boss inner circumferential surface of the revolving scroll, and a long long hole is formed in the body so that the pin portion is inserted and slides left / right. The method of claim 11, And an elastic body elastically connecting the inner surface of the long hole portion and the pin portion. The method according to claim 1 or 3, The radially compliant structure; High-pressure scroll compressor characterized in that the body is rotatably mounted on the boss inner circumferential surface of the swing scroll, and the pin portion is inserted into the body so that the eccentric hole is formed to move left and right by drawing an arc. The method according to claim 1 or 3, And a back pressure chamber having a high pressure part and an intermediate pressure is sealed to each other by using a reaction force caused by gas pressure between the lower end surface of the radially compliant structure and the upper end surface of the rod part.