KR100679891B1 - A pressure distribution apparatus for a rotating scroll of a scroll compressor - Google Patents

Abstract

The present invention is to increase the rotating scroll by the back pressure during the compression action of the scroll compressor to cancel the force exerted in the crank axis direction as well as to minimize the friction force generated between the bottom of the swing scroll and the main frame. in order to,

A back pressure device for a scroll compressor of a scroll compressor, characterized in that the back scroll means is provided to be raised by the high-pressure refrigerant gas discharged through the discharge pipe.

Description

Pressure swing apparatus for a rotating scroll of a scroll compressor {a pressure distribution apparatus for a rotating scroll of a scroll compressor}

1 is a sectional view schematically showing a main part of a general low pressure scroll compressor.

Figure 2 is an enlarged cross-sectional view of the main portion of the compression unit according to FIG.

3 is a sectional view of principal parts of the present invention applied to a scroll compressor.

4A is an enlarged cross-sectional view of the main portion of part A according to FIG. 3;

4b is a sectional view showing principal parts schematically showing an operating state according to FIG. 4a;

Figure 5a is a cross-sectional view of the main portion schematically showing another embodiment of the present sealing member.

FIG. 5B is a sectional view showing the principal parts of the operating state according to FIG. 5A; FIG.

Figure 6a is a perspective view of the main portion schematically showing another embodiment of the present sealing member.

FIG. 6B is an essential part cross-sectional view schematically showing an operating state according to FIG. 6A;

Figure 7a is a perspective view schematically showing the main portion of another embodiment of the present sealing member.

FIG. 7B is an essential part cross sectional view of an operating state according to FIG. 7A; FIG.

Explanation of symbols for the main parts of the drawings

1: Shell 2: Mainframe

6: crankshaft 7: turning scroll

16 discharge pipe 18 discharge chamber

30: back pressure means

40: connecting member

   42: connector 42a: decompression unit

   44: supply path 44a: pressure control valve

50: back pressure chamber

   52: insertion groove 54: sealing member

   540: inflow space 540a: slope

   540b: receiving groove 542: airtight

   544 support

The present invention relates to a scroll compressor, and more particularly, during the compression action of the swing scroll, the swing scroll is raised by the back pressure to cancel the force applied in the crank axis direction, and is generated between the bottom of the swing scroll and the main frame. It relates to a back pressure device for a rotating scroll of a scroll compressor to minimize the frictional force.

In general, as shown in FIG. 1, the main compressor 2 and the subframe 3 are installed in the upper and lower parts of the shell 1, and the main frame 2 and the subframe 3 of the scroll compressor are shown in FIG. 1. Between the stator 4 and the inside of the shell (1) is pressed in between, the stator (4) is provided with a rotor (5) rotated by an applied power source, the rotor (5) A vertical crankshaft 6 is inserted and fixed at the center of the crankshaft 6 so as to rotate together with the rotor 5. The upper and lower portions of the crankshaft 6 have a main frame 2 and a subframe 3. Is rotatably supported.

And the upper surface of the main frame (2) is provided with a rotating scroll (7) having a lower side coupled to the crankshaft (6) and an involute-shaped swing wrap (7a) formed on the upper side, the turning scroll (7) On the upper side of the fixed scroll (8) having a fixed wrap (8a) to engage the swing wrap (7a) is fixed to the inside of the shell (1) the swing scroll (7) by the rotation of the crank shaft (6) By doing so, the refrigerant gas flowing into the compression chamber 22 formed between the turning wrap 7a and the fixed wrap 8a is configured to be compressed.

In addition, the combination of the crankshaft 6 and the swinging scroll (7) is the crank pin (10) protruding upward from the position spaced apart from the center of the upper surface of the crankshaft 6 by a predetermined distance to the pivoting scroll (7) It is made by inserting into the boss portion (7b) protruding from the lower side central portion of the, the bearing 11 is forcibly pressed into the boss portion (7b), the eccentric bush (12) outside the crank pin (10) ) Is rotatably coupled within a certain angle.

On the other hand, between the main frame (2) and the revolving scroll (3) is provided with an anti-rotation mechanism Olddam ring (9), the crankshaft (6) inside the fuel passage (6a) is formed through the upper and lower, The upper balance weight 13 and the lower balance weight 14 are formed in the electron 5, respectively, to prevent rotational imbalance of the crankshaft 6 by the crank pin 10.

Here, reference numerals 15 and 16 are suction pipes and discharge pipes, 17 and 18 are discharge ports and discharge chambers, 19 is reverse displacement, 20 is oil, and 21 is oil propeller.

In the scroll compressor configured as described above, the rotor 5 rotates inside the stator 4 by an applied power source, and the crankshaft 6 rotates by the rotor 5. Rotating scroll (7) coupled to the is to make a turning movement along the turning radius between the center of the crankshaft (6) and the turning scroll (7).

In addition, the compression chamber 22 formed between the swing wrap 7a and the fixed wrap 8a reduces the volume by the continuous swing motion of the swing scroll 7 to further compress the sucked refrigerant gas. The high pressure refrigerant gas is discharged to the discharge chamber 18 through the discharge port 17, and the refrigerant gas inside the discharge chamber 18 is discharged to the outside through the discharge pipe 16 again.

However, as shown in FIG. 2 in the process of turning the conventional turning scroll 7 as described above, in particular, between the upper surface of the main frame 2 and the bottom of the turning scroll 7, in particular, the boss portion 7b. The crank pin 10 coupled with the large load due to the compression action has a problem that the performance is degraded as the friction force increases.

In other words, in the process of compressing while the swinging scroll 7 rotates by the crankshaft 6, as the compression is gradually performed at a high pressure from the outside of the swinging scroll to the center, a high pressure is generated at the center, In addition to the large force applied to the crank axial direction due to the compression action of the swing scroll, the bottom surface of the swing scroll and the top surface of the main frame also caused a large friction force.

Accordingly, as the swing scroll of the scroll compressor rotates, a large force is applied in the crank axis direction during compression, and a friction force generated between the swing scroll and the main frame has a problem in that the performance of the scroll compressor is significantly reduced.

Accordingly, the present invention has been made to solve the conventional problems as described above, the object is to increase the turning scroll by the back pressure during the compression action of the turning scroll in the scroll compressor to cancel the force applied in the crank axis direction In addition, the friction force generated between the bottom of the swing scroll and the main frame is to be minimized.

Another object of the present invention is to enable a smooth adjustment of the back pressure.

Still another object of the present invention is to make it possible to quickly raise the turning scroll according to the back pressure action.

Still another object of the present invention is to have a simpler structure and to raise the turning scroll even more rapidly during the back pressure action.

Still another object of the present invention is to maintain the airtightness at the time of back pressure action.

The present invention for achieving the above object, in the swing scroll of the scroll compressor for discharging the compressed refrigerant through the discharge chamber and the discharge pipe while rotating by the crank shaft coupled to the upper surface of the main frame, The main frame is connected between the discharge pipe and the inside of the shell and the connecting pipe between the discharge pipe and the bottom of the swing scroll so as to be elevated by the high pressure refrigerant gas discharged through the discharge pipe. Consists of a connecting member consisting of a supply path formed in the connecting member, and the upper surface of the main frame is composed of a back pressure chamber formed inside and outside the supply hole of the connecting member so that the high-pressure refrigerant gas supplied by the connecting member does not leak And a back pressure means.

delete

delete

The connecting pipe is characterized in that it comprises a decompression unit.

The supply passage is characterized in that it comprises a pressure control valve.

The back pressure chamber is characterized in that the insertion grooves formed in the main frame on both sides of the connecting member and the sealing member having a smaller size than the insertion groove is inserted.

The sealing member is characterized in that the square.

The sealing member is characterized in that it is configured to be expanded by the high-pressure refrigerant gas flowing in.

The sealing member is characterized by consisting of a hermetic tool that is closed on one side and one side is opened, and a support that is inserted and supported inside the hermetic tool.

The hermetic opening is characterized in that the open portion is installed facing each other.

One side and the bottom of the sealing member is characterized in that the inlet space is formed to be connected to each other.

The inflow space is characterized in that the inclined surface formed from the upper end of the one side and the stepped receiving groove in the bottom surface of the sealing member to be connected to the bottom of the inclined surface.

The upper surface of the sealing member is characterized in that for forming a plurality of grooves.

The groove is characterized in that it is formed in a direction orthogonal to the turning direction of the turning scroll.

Hereinafter, the same structure of the scroll compressor described above with reference to the preferred embodiment of the present invention will be described in more detail with reference to the accompanying drawings with the same reference numerals.

3 is a sectional view showing the main parts of the state in which the present invention is applied to a scroll compressor, and FIG. 4A is an enlarged sectional view of the main part of part A according to FIG. 3.

As shown, the compressed refrigerant is rotated by the crank shaft 6 coupled to the upper surface of the main frame 2 fixed to the inside of the shell 1 to discharge the discharge chamber 18 and the discharge pipe 16. The invention relates to a swinging scroll (7) of a scroll compressor discharged through the present invention, and the present invention cancels the force generated in the crank axis direction by the pressure of the high-pressure refrigerant gas compressed to the center during the compression action of the swinging scroll. Of course, in order to minimize the friction between the bottom of the swing scroll and the top of the main frame,

It is shown that the back pressure means (30) is provided to induce a portion of the high-pressure refrigerant gas discharged through the discharge pipe 16 to be raised by the induced partial pressure.

The back pressure means 30 is connected to the discharge member via the discharge pipe 16 and the bottom surface of the turning scroll (7) 40, the upper surface of the main frame (2) by the connecting member (40) Forming a back pressure chamber 50 formed at a position not to deviate from the turning radius of the turning scroll so as to easily raise the turning scroll without leakage of the supplied high-pressure refrigerant gas; It is preferable.

The connecting member 40 has one end connected to the discharge pipe 16 and the other end connected to the inside of the shell 1 and the end of the connecting pipe 42 so as to be connected to the bottom of the turning scroll. It is preferably composed of a supply path 44 formed in the main frame (2).

The connecting pipe 42 is preferably provided with a decompression unit 42a which is expanded and narrowed so as to supply the high-pressure refrigerant gas discharged through the discharge pipe and lowered the pressure to some extent.

The supply path 44 is provided with a high pressure refrigerant gas as a normal pressure control valve (44a) to supply and shut off the supplied high pressure refrigerant gas by a signal of a known control means or to be opened and closed according to the pressure difference. It is desirable to control the supply. At this time, the main frame in which the supply path is formed is provided with airtight means such as a conventional O-ring for preventing leakage.

The back pressure chamber 50 has an insertion groove 52 formed in the main frame 2 on both sides of the supply path 44 of the connection member 40 and a sealing member 54 having a smaller size than the insertion groove 52. ) Is configured to be inserted, so as to be in close contact with the bottom surface of the swing scroll to maintain airtightness.

The sealing member 54 is preferably formed in a square so as to have a maximum airtightness with the bottom surface of the turning scroll.

The present invention configured as described above, due to the high pressure generated in the upper center of the swing scroll due to the compression action of the swing scroll cancels the force applied in the crank axis direction as well as the bottom surface of the swing scroll and the top surface of the main frame In order to minimize the frictional force generated therebetween by the back pressure means to raise the rotating scroll by inducing some high-pressure refrigerant gas discharged through the discharge pipe.

In other words, the pressure of the refrigerant gas of the high pressure induced in the discharge pipe is primarily reduced in the connection pipe formed with the decompression unit, which is a connection member of the back pressure means, and the supply path connected to the connection pipe is controlled by the control signal of the pressure control valve provided therein. Supply and shut off.

In this way, the high-pressure refrigerant gas supplied by the pressure control valve is supplied to the back pressure chamber formed in the main frame, the back pressure chamber 50 is of a rectangular inserted into the insertion groove 52 as shown in Figure 4b As the sealing member 54 is raised by the high pressure refrigerant gas pressure supplied, the sealing member 54 serves to support the bottom surface of the turning scroll 7 and to increase the same.

In this case, the back pressure chamber is formed on both sides of the connection member, that is, on both sides of the supply passage, so that the high-pressure refrigerant gas supplied through the supply passage flows into the insertion groove and raises the sealing member inserted therein. The high pressure refrigerant gas supplied accordingly does not leak and raises the turning scroll by the pressure.

Accordingly, the frictional force generated between the bottom and the mayframe as the turning scroll is raised not only cancels the force applied in the crank axial direction that turns the turning scroll due to the compression action of the upper center of the turning scroll. In addition, by providing a condition that can be minimized, it is possible to prevent performance degradation of the scroll compressor.

Figure 5a is a sectional view of the main part schematically showing another embodiment of the sealing member of the present invention, Figure 5b is a sectional view of the main part schematically showing the operating state according to FIG.

In the above configuration as shown, in order to be able to quickly increase the turning scroll by the high-pressure refrigerant gas flowing into the back pressure chamber formed in the main frame,

The sealing member 54 is shown to be configured to be expanded by the refrigerant gas of the high pressure flowing.

The sealing member 54 is preferably composed of an airtight tool 542 whose three sides are closed and one side is opened, and a support 544 such as a spring having a general elasticity which is inserted and supported in the airtight tool.

The hermetic opening 542 may be such that the high pressure refrigerant gas supplied as the open portions face each other is not leaked from the back pressure chamber.

Accordingly, the high pressure refrigerant gas introduced through the supply path 44 of the connection member flows into the insertion groove 52 of the back pressure chamber 50 and simultaneously pressurizes the upper end of the airtight opening 542 of the open side. By expanding the upper end of the hermetic opening while supporting the bottom surface of the swinging scroll 7, and having the condition that the swinging scroll can be quickly raised as compared with the rectangular sealing member described above.

On the other hand, the support 544 in the hermetic opening 542 serves to prevent the open portion of the hermetic opening from sagging when the high-pressure refrigerant gas is not introduced.

Figure 6a is a perspective view of the main part schematically showing another embodiment of the sealing member of the present invention, Figure 6b is a sectional view of the main part schematically showing the operating state according to Figure 6a.

In the above configuration as shown, in order to be able to raise the swing scroll more quickly by a sealing member provided as the insertion groove of the back pressure chamber,

One side and the bottom of the sealing member 54 is connected to each other is shown that the inlet space portion 540 is formed to rise and rise more rapidly the high-pressure refrigerant gas flowing through the supply path.

The inflow space 540 is inclined surface (540a) formed from the upper end of the lower side so that the high-pressure refrigerant can be introduced quickly, and the sealing member so as to be quickly risen by the pressure connected to the bottom of the inclined surface ( 54 is preferably formed as a stepped receiving groove 540b at the bottom surface.

Accordingly, the high pressure refrigerant gas introduced through the supply path 44 flows into the insertion groove 52 and at the same time flows into the inflow space 540 of the sealing member 54 to quickly rise, that is, the high pressure. Refrigerant gas has a condition that can quickly rise the sealing member as it flows into the inclined surface and the receiving groove formed on one side of the sealing member more quickly, the turning scroll (7) also a condition that can be raised more quickly It will also be provided.

7A is a perspective view schematically illustrating another example of the sealing member of the present invention, and FIG. 7B is a schematic cross-sectional view illustrating the operating state of FIG. 7A.

As shown in the above configuration, the inlet space formed in the sealing member has a condition for rapidly raising the turning scroll, and the high-pressure refrigerant gas minimizes leakage to the outside of the back pressure chamber. for,

The upper surface of the sealing member 54 is shown to form a plurality of grooves (545).

The groove 545 is preferably formed in a direction perpendicular to the turning direction of the turning scroll (7).

As a result, a plurality of grooves formed in the upper surface of the sealing member in contact with the bottom surface of the swing scroll 2 has a close adhesion with the swivel movement of the swing scroll as well as loss of airtightness from one side. Even if it has a condition that can be easily made sequential blocking.

As described above, the present invention, during the compression action of the swing scroll in the scroll compressor to raise the swing scroll by the back pressure of the back pressure means to cancel the force applied to the crankshaft, and is generated between the bottom of the swing scroll and the main frame By minimizing the frictional force, it is possible to increase the efficiency by preventing the performance of the scroll compressor.

In addition, the pressure control valve provided in the pressure-reducing unit and the supply passage formed in the high-pressure refrigerant gas to facilitate the adjustment of the back pressure, the effect of the appropriate back pressure action according to the operation of the scroll compressor can be made. Will also have.

In addition, since the sealing member according to the back pressure action can be expanded quickly, it also has the effect of quickly raising the swing scroll.

In addition, the inlet space formed in the sealing member has a simpler structure and has the effect of increasing the turning scroll more rapidly during the back pressure action.

In addition, the plurality of grooves formed on the upper surface of the sealing member to maintain the airtightness at the time of the back pressure action, and also has the effect that the back pressure action can be made more stable.

Claims (14)

delete delete In the rotating scroll of the scroll compressor for discharging the compressed refrigerant through the discharge chamber and the discharge pipe while rotating by the crank shaft coupled to the upper surface of the main frame, A connection pipe connected to the discharge pipe and the inside of the shell and the connection pipe between the discharge pipe and the bottom surface of the swing scroll to raise the swing scroll by the high-pressure refrigerant gas discharged through the discharge pipe. The connecting member is configured to be connected to the supply path formed in the main frame so that the upper surface of the main frame is formed inside and outside the supply hole of the connecting member so that the high-pressure refrigerant gas supplied by the connecting member does not leak Back pressure device for a rotating scroll of the scroll compressor, characterized in that it comprises a back pressure means consisting of a back pressure chamber. 4. The back pressure scroll device for a scroll compressor of a scroll compressor according to claim 3, wherein the connection pipe is provided with a decompression unit. 5. The back pressure scroll device for a scroll compressor according to claim 3 or 4, wherein the supply passage includes a pressure control valve. The back pressure device for a scroll compressor of a scroll compressor according to claim 3, wherein the back pressure chamber is configured such that an insertion groove formed in both main frames of the connecting member and a sealing member having a smaller size than the insertion groove are inserted. . 7. The back pressure device for a scroll scroll of claim 6, wherein the sealing member is rectangular. 7. The back pressure scroll device of a scroll compressor according to claim 6, wherein the sealing member is configured to expand by a high-pressure refrigerant gas flowing therein. 9. The back pressure scroll device for a scroll compressor according to claim 8, wherein the sealing member comprises an airtight tool whose three surfaces are closed and one surface is opened, and a support that is inserted and supported in the airtight tool. 10. The back pressure scroll device for a scroll compressor according to claim 9, wherein the airtight openings are installed so that the open portions face each other. 7. The back pressure device for a scroll compressor of a scroll compressor according to claim 6, wherein an inflow space portion connected to each other is formed at one side and the bottom of the sealing member. The rotating scroll of the scroll compressor according to claim 11, wherein the inflow space is formed with an inclined surface formed from an upper end of the one side to a lower side, and a stepped receiving groove at the bottom of the sealing member so as to be connected to the bottom end of the inclined surface. Back pressure device. The back pressure device for a scroll compressor of a scroll compressor according to claim 11 or 12, wherein a plurality of grooves are formed on an upper surface of the sealing member. The swing back pressure device for a scroll compressor according to claim 13, wherein the groove is formed in a direction orthogonal to the swing direction of the swing scroll.

Images