KR20090027348A - A scroll compressor having sealing structure for back pressure chamber - Google Patents

Abstract

A scroll compressor having a back pressure chamber sealing structure is provided to ensure perfect sealing of back pressure chamber even in initial state or when the compression reactive force is higher than the back pressure. A scroll compressor comprises a housing(800) consisting of a front housing(810) and a rear housing(820), a scroll compressing unit including a fixed scroll(500) and a rotating scroll(400), a discharge unit which discharges high pressure fluid, a main frame(860) supporting the backside of the rotating scroll, a thrust plate(870) arranged between the backside of the rotating scroll and the main frame, and a guide plate(100) attached to the rear circumference of the rotating scroll so that the central part protrudes rearward and contacts the thrust plate.

Description

Scroll compressor having back pressure seal sealing structure {A SCROLL COMPRESSOR HAVING SEALING STRUCTURE FOR BACK PRESSURE CHAMBER}

The present invention relates to a scroll compressor having a back pressure chamber sealing structure, and more particularly, to maintain the sealing of the back pressure chamber while having a rotation prevention mechanism to improve the efficiency, excellent durability and simple assembly structure back pressure chamber sealing structure It relates to a scroll compressor having a.

In general, a scroll compressor is a device that performs compression through the relative motion of a fixed scroll consisting of a scroll wrap and fixed regardless of the rotation of the drive shaft and the swinging scroll that rotates in accordance with the rotation of the drive shaft. Is disclosed.

In addition, in order to maintain a predetermined compression efficiency, during orbiting the swinging scroll, rotation needs to be prevented within an error range, and a rotation prevention mechanism is generally included in itself.

Also, a scroll compressor generally includes a housing, a drive unit for generating rotational force, a suction unit through which fluid is sucked from the outside, a scroll compressor for compressing fluid sucked from the suction unit, and a compression by the scroll compressor. The high pressure fluid is roughly classified into a discharge part which is discharged.

Korean Patent Publication No. 0672283 (hereinafter referred to as "prior art") discloses a typical configuration of such a conventional scroll compressor, and the configuration thereof will be briefly described with reference to FIGS. 1A and 1B. .

First, the housing 800 is composed of a front housing 810 and a rear housing 820, the main frame 860 for supporting the anti-rotation mechanism and the drive shaft 200, which will be described later in the interior therein separately Equipped.

The drive unit includes a stator 210 and a drive motor 230 formed of a rotor 220 positioned inside the stator 210, and a drive shaft 200 that is rotated by being inserted over a central portion of the drive motor 230. Included.

In addition, a main bearing 240 and a sub bearing 250 are installed on the drive shaft 200 driven by the drive motor 230, and the sub bearing 250 is eccentric with respect to the drive shaft 200. Supports the circumference of the installed eccentric action unit 260.

In addition, the scroll compression unit is composed of a fixed scroll 500 and the revolving scroll 400, the fixed scroll 500 is fixed to the housing 800, the scroll wrap 510 is formed, the revolving The scroll 400 is combined with the fixed scroll 500 and is also formed of a spiral scroll wrap 410.

In addition, the eccentric action portion 260 installed on the drive shaft 200 is connected to the swinging scroll 400 via the sub-bearing 250.

Accordingly, as the drive shaft 200 rotates, the eccentric action unit 260 rotates eccentrically with respect to the drive shaft 200, and eventually, the orbiting scroll (3) installed on the eccentric action unit 260 via the sub bearing 250. 400 is pivoted relative to the fixed scroll 500.

As described above, pockets are formed between the scroll wraps 410 and 510 according to the turning motion of the turning scroll 400, and the refrigerant is compressed while the volume thereof is continuously changed.

On the other hand, the suction unit includes a suction tube (not shown) formed on one side of the compressor outer circumferential surface, and a suction chamber 710 communicating with the suction tube and accumulating the introduced refrigerant.

The discharge unit may include a discharge port 600 formed at the center of the fixed scroll 500 to discharge the compressed refrigerant, and a discharge chamber 610 communicated with the discharge port 600 and formed at an end of the compressor. It is.

In addition, a thrust plate 870 supporting the pivoting movement of the pivoting scroll 400 is interposed between the pivoting scroll 400 and the support of the housing 800.

In addition, a rotation prevention mechanism is configured in a scroll compression unit that has a function of compressing the sucked fluid (refrigerant) as the swing scroll 400 rotates.

The anti-rotation mechanism is first provided with a guide ring 100 along the periphery of the suction scroll of the fixed scroll 500, a plurality of dowel pins (900) in the periphery of the swinging scroll 400 It is a structure installed to protrude. In particular, the dowel pin 900 is installed toward the guide ring 100.

In addition, an inner circumference of the guide ring 100 is formed with an alignment groove 150 for receiving the alignment pin 900 along an inner circumference.

In addition, the guide ring 100 is disposed between the fixed scroll 500 and the main frame 860 to prevent rotation of the revolving scroll 400.

However, according to this prior art, the guide ring 100 has a structure fixed between the fixed scroll 500 and the main frame 860, the pivoting between the swinging scroll 400 and the support of the housing 800. Since only the thrust plate 870 supporting the pivoting movement of the scroll 400 is interposed, the sealing of the back pressure chamber is destroyed when only the initial state and the back pressure are actuated, so that the high-pressure refrigerant gas is pivoted with the thrust plate 870. When the high pressure is generated in the back pressure chamber through the scroll 400 between the back pressure chamber, this causes excessive friction between the swinging scroll 400 and the fixed scroll 500 to reduce the efficiency of the compressor and breakage occurs There was.

In addition, according to the prior art, since a separate coupling means for coupling the thrust plate 800, the main frame 860 and the rear housing 820 in addition to the anti-rotation mechanism was required, the number of parts was increased and the assembly structure was complicated.

In addition, according to the prior art, because the coupling means between the front housing and the rear housing is formed long and thin, there was also a problem that the durability is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide a scroll compressor that can sufficiently maintain a sealing of a back pressure chamber while having a rotation preventing mechanism.

It is also an object of the present invention to provide a scroll compressor having a low number of parts and a back pressure chamber sealing structure with a simple assembly and assembling process.

It is also an object of the present invention to provide a scroll compressor having a back pressure chamber sealing structure with excellent durability.

In order to achieve the above object, the present invention,

A housing for accommodating the component parts; A driving unit for generating rotational force; A suction part through which fluid is sucked from the outside; A fixed scroll composed of a helical scroll wrap for compressing the fluid sucked from the suction part and fixed to the drive shaft regardless of the rotation of the drive shaft, and a spiral that pivots according to the rotation of the drive shaft and engages with the scroll wrap of the fixed scroll. A scroll compression unit configured of a turning scroll in which scroll wraps are formed; A discharge part through which the high pressure fluid compressed by the scroll compression part is discharged; A main frame disposed inside the housing to support a rear surface of the pivoting scroll; A scroll compressor comprising a thrust plate disposed between a rear surface of the swing scroll and a main frame,

A guide plate is attached to the rear circumference of the revolving scroll, and a center portion thereof protrudes rearward to contact the thrust plate.

Here, the center portion of the guide plate is characterized in that it is bent backwards.

In addition, the rear center portion of the revolving scroll is characterized in that it is formed to protrude rearward corresponding to the central portion of the guide plate.

In addition, a plurality of fixing pins protrude around the rear surface of the revolving scroll, and the fitting plate is formed in the guide plate to be fitted to the fixing pin.

In addition, the guide plate is characterized in that composed of spring steel.

On the other hand, a plurality of coupling pipes extending toward the rear of the drive shaft is formed around the rear surface of the fixed scroll, and the outer peripheral portion of the guide plate is characterized in that the engaging groove through which the coupling pipe passes.

In addition, an accommodating groove is formed at a rear end of the outer periphery of the fixed scroll, the coupling pipe is installed at the bottom of the accommodating groove, and a portion of the outer periphery of the guide plate is accommodated in the accommodating groove.

In addition, a coupling groove is formed between the locking groove and the locking groove on the outer circumference of the guide plate, and a protrusion between the accommodation groove and the accommodation groove of the fixed scroll is disposed in the coupling groove.

In addition, the housing is composed of a front housing and a rear housing,

After the thrust plate, the main frame and the rear housing is fitted to the coupling pipe, a bolt enters the coupling pipe and is screwed with the rear housing.

According to the present invention having the above-described configuration, the guide plate is surely sealed in the back pressure chamber in any state such as an initial state or a state in which the compression reaction force is greater than the back pressure.

In addition, since the anti-rotation function can be performed by the coupling pipe, the durability is excellent.

In addition, since the coupling pipe is first passed through the thrust plate and the main frame, the coupling bolt is inserted into the hollow of the coupling pipe and screwed to the rear housing, thereby simplifying the assembly process.

In addition, a receiving groove is formed at the rear end of the outer peripheral portion of the fixed scroll, the coupling pipe is formed at the bottom of the receiving groove, and a coupling groove is formed between the locking groove and the locking groove at the outer circumference of the guide plate. It is formed, characterized in that the protrusion between the receiving groove and the receiving groove of the fixed scroll in the coupling groove is characterized in that the assembly configuration is compact and the volume is small.

Hereinafter, with reference to the accompanying Figures 2 to 6 will be described in detail a preferred embodiment of the present invention. However, the same reference numerals are given to the same components as the above-described prior art.

First, as shown in FIGS. 2 to 4, the scroll compressor 1000 according to the present invention includes a housing 800 for accommodating components and a driving unit for generating a rotational force; And a suction part for sucking fluid from the outside, a scroll compression part for compressing the fluid sucked from the suction part, and a discharge part for discharging the high pressure fluid compressed by the scroll compression part.

The housing 800 is composed of a front housing 810 and a rear housing 820, the inside of the housing 800, the main frame for supporting the anti-rotation mechanism and drive shaft 200, which will be described later in the inside ( 860 is provided separately. Of course, three or more housings 800 may be formed differently from the drawing.

In addition, the drive unit includes a stator 210 and a drive motor 230 including a rotor 220 positioned inside the stator 210, and a drive shaft 200 inserted and rotated on a center of the drive motor 230. ) Is included.

In addition, a main bearing 240 and a sub bearing 250 are installed on the drive shaft 200 driven by the drive motor 230, and the sub bearing 250 is eccentric with respect to the drive shaft 200. Support the circumferential portion of the eccentric action portion 260 is installed.

In addition, the scroll compression unit is composed of a fixed scroll 500 and the revolving scroll 400, the fixed scroll 500 is fixed to the housing 800, the scroll wrap 510 is formed, the revolving The scroll 400 is combined with the fixed scroll 500 and is also formed of a spiral scroll wrap 410. The scroll wrap 510 of the fixed scroll 500 and the scroll wrap 410 of the orbiting scroll 400 are combined to overlap each other in a facing posture.

In addition, the eccentric action portion 260 installed on the drive shaft 200 is connected to the swinging scroll 400 via the sub-bearing 250.

Accordingly, as the drive shaft 200 rotates, the eccentric action unit 260 rotates eccentrically with respect to the drive shaft 200, and eventually, the orbiting scroll (3) installed on the eccentric action unit 260 via the sub bearing 250. 400 is pivoted relative to the fixed scroll 500.

As described above, pockets are formed between the scroll wraps 410 and 510 according to the turning motion of the turning scroll 400, and the refrigerant is compressed while the volume thereof is continuously changed.

On the other hand, the suction unit includes a suction tube (not shown) formed on one side of the compressor outer circumferential surface, and a suction chamber 710 communicating with the suction tube and accumulating the introduced refrigerant.

In addition, the discharge portion discharge port 600 is formed in the center of the fixed scroll 500 to discharge the compressed refrigerant, and the discharge chamber 610 in communication with the discharge port 600 and formed at the end of the compressor Consists of.

A thrust plate 870 is supported between the pivoting scroll 400 and the main frame 860 to support the pivoting motion of the pivoting scroll 400.

In addition, a plurality of coupling pipes 550 extending toward the rear of the driving shaft 200 are formed around the rear surface of the fixed scroll 500. As shown, the coupling pipe 550 is preferably formed at equal intervals in the circumferential direction of the fixed scroll 500, but is not essential.

The coupling bolt 890 to be described later is inserted into the hollow of the coupling pipe 550.

In addition, a substantially ring-shaped guide plate 100 is attached to the rear circumference of the revolving scroll 400. In addition, a locking groove 110 is formed at an outer circumference of the guide plate 100 to provide a space through which the coupling pipe 550 passes. That is, the locking groove 110 is formed at a corresponding position such that the coupling pipe 550 passes backward along the direction of the drive shaft 200.

In this case, a plurality of fixing pins 470 are formed to protrude from the rear circumference of the pivoting scroll 400, and the guide plate 100 is provided with fitting holes 170 that are fitted to the fixing pins 470. The pivoting scroll 400 and the guide plate 100 are combined without relative rotation. The coupling by the fixing pin 470 may be a fixed coupling or a coupling capable of relative movement in the axial direction.

The guide plate 100 is preferably made of a metal having excellent elasticity, such as spring steel.

5A and 5B, an accommodating groove 580 is formed at the rear end of the outer peripheral portion of the fixed scroll 500, and a coupling pipe 550 is formed at the bottom of the accommodating groove 580. Is formed.

In addition, a coupling groove 120 is formed between the locking groove 110 and the locking groove 110 at an outer circumference of the guide plate 100, and accommodates the fixed scroll 500 in the coupling groove 120. A protrusion 590 between the groove 580 and the accommodation groove 580 is inserted and installed.

According to this configuration, the swinging scroll 400 and the fixed scroll 500 are combined very compactly, thereby reducing their volume.

In this case, since the coupling pipe 550 fixed to the fixed scroll 500 is caught by the locking groove 110 formed in the guide plate 100, the pivoting scroll 400 of the swinging scroll 400 attached to the guide plate 100 is fixed. Prevents rotation naturally.

In particular, the central portion of the guide plate 100 protrudes rearward to elastically contact the thrust plate 870. In the figure, the central portion is bent backward and protrudes.

In addition, the rear center portion of the pivoting scroll 400, that is, the inner portion of the portion in contact with the circumferential portion of the guide plate 100 is formed to protrude rearward corresponding to the center portion of the guide plate 100. It is easy to press the center of 100).

Specifically, as shown in FIG. 6B, the center portion of the guide plate 100 is bent backward so that the center portion of the guide plate 100 burns on the surface of the thrust plate 870 even in the initial state in which only the back pressure acts. Sexual contact can maintain the sealing of the back pressure chamber.

In addition, as shown in FIG. 6A, even when the compression reaction force is greater than the back pressure according to the refrigerant compression, the turning scroll 400 presses the guide plate 100 to press the thrust plate 870 so that sealing is naturally possible. .

On the other hand, the assembly pipe is very simple by the coupling pipe 550. That is, since the coupling pipe 550 is already fixed to the fixed scroll 500, the front housing 810 in the state where the coupling pipe 550 continuously passes through the thrust plate 870 and the main frame 860. ) And the rear housing 820, the coupling bolt 890 is inserted into the hollow of the coupling pipe 550 through a simple assembly process of screwing the rear housing 820, all the components are firmly coupled.

In addition, since the coupling pipe 550 having a larger diameter than the coupling bolt 890 is assembled first, durability is increased.

Reference numeral 300, which is not described, denotes an inverter, and G denotes a gasket.

Figure 1a is a longitudinal sectional view showing the structure of a scroll compressor according to the prior art.

1B is an exploded perspective view of FIG. 1A.

2 is a longitudinal sectional view showing the structure of a scroll compressor having a back pressure chamber sealing structure according to the present invention.

3 is an exploded perspective view of FIG. 2.

4 is a front view of FIG. 2.

FIG. 5A is a perspective view illustrating a coupling structure of the swing scroll and the fixed scroll in FIG. 2.

5B is an exploded perspective view of FIG. 4A.

FIG. 6A is a cross-sectional view taken along the line A-A of FIG. 5 and showing a structure in which the compression reaction force is larger than the back pressure.

FIG. 6B is a cross-sectional view taken along the line A-A in FIG. 5, showing the structure of the state in which the back pressure initially operates.

<Description of Major Reference Signs>

100 ... guide plate

110 ... Hanging groove

120. Coupling groove

170 ... fitting hole

400 ... Turning Scroll

410 ... Spiral wrap of turning scroll

470 ... Push pin

500 ... fixed scroll

510 ... Spiral wrap of fixed scroll

550 ... combined pipe

580 ... accommodation home

590 ... Stone

800 ... housing (frame)

810 ... front housing

820 ... rear housing

860 ... mainframe

870 ... thrust plate

890 ... locking bolt

Claims (9)

A housing for accommodating the component parts; A driving unit for generating rotational force; A suction part through which fluid is sucked from the outside; A fixed scroll composed of a helical scroll wrap for compressing the fluid sucked from the suction part and fixed to the drive shaft regardless of the rotation of the drive shaft, and a spiral that pivots according to the rotation of the drive shaft and engages with the scroll wrap of the fixed scroll. A scroll compression unit configured of a turning scroll in which scroll wraps are formed; A discharge part through which the high pressure fluid compressed by the scroll compression part is discharged; A main frame disposed inside the housing to support a rear surface of the pivoting scroll; A scroll compressor comprising a thrust plate disposed between a rear surface of the swing scroll and a main frame, A guide plate is attached to the rear circumference of the revolving scroll, the center portion of the scroll compressor having a back pressure chamber sealing structure, characterized in that protruding rearward to contact the thrust plate. The method of claim 1, And a center portion of the guide plate is bent backward. The method of claim 2, And a back pressure chamber sealing structure formed to protrude rearward corresponding to the center portion of the guide plate. The method of claim 1, And a plurality of fixing pins protruding from the rear circumference of the revolving scroll, and the guide plate is formed with a fitting hole fitted to the fixing pin. The method of claim 1, The guide plate is a scroll compressor having a back pressure chamber sealing structure, characterized in that consisting of spring steel. The method according to any one of claims 1 to 5, A plurality of coupling pipes extending toward the rear of the drive shaft are formed around the rear surface of the fixed scroll, and a backing chamber sealing structure is formed at an outer circumferential portion of the guide plate to have a locking groove through which the coupling pipe passes. Branch scroll compressor. The method of claim 6, An accommodation groove is formed at the rear end of the outer peripheral portion of the fixed scroll, and the coupling pipe is installed at the bottom of the accommodation groove, and a portion of the outer peripheral portion of the guide plate is accommodated in the accommodation groove. Scroll compressor. The method of claim 7, wherein A coupling groove is formed between the locking groove and the locking groove on the outer circumference of the guide plate, and a protrusion between the accommodation groove and the accommodation groove of the fixed scroll is disposed in the coupling groove. Scroll compressor. The method of claim 6, The housing consists of a front housing and a rear housing, And a thrust plate, a main frame, and a rear housing are fitted to the coupling pipe, and then a bolt enters the coupling pipe to screw the rear housing together.

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