JPH07229484A - Scroll compressor - Google Patents

Abstract

PURPOSE:To prevent any performance degradation in a compressor from occurring by countervailing each upsetting moment of both driving and driven scrolls. CONSTITUTION:This scroll compressor houses a motor-operated element 2 and a compressive element, and it is provided with a driving scroll 4 with a shaft 13 connected to the motor-operated element 2 after erecting a lap 12 on an end plate 11, and another scroll 5 having the shaft 13 and a decentered shaft, and getting a lap 15 erected on an end plate 14, respectively. Three compressive spaces 18a, 18b and 18c being formed by these scrolls 4 and 5 in the inner part of a hollow chamber to be formed in the inner part of a frame pivotally supporting the scrolls 4 and 5 are contracted inwards from the outside, whereby a fluid is compressed from low pressure, intermediate pressure and high pressure in order. In this compressor 1 consisting of an Oldham's coupling 10 rotating these scrolls 4 and 5 in the same direction and a regulating member 9 being clamped to the scroll 4 and set up in the back of the end plate 14, each back pressure chamber 28 capable of controlling pressure in the inner part according to operating conditions of this compressor 1 is installed in each backside of these scrolls 4 and 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor for rotating both scrolls in the same direction for compression.

[0002]

2. Description of the Related Art A scroll compressor accommodates an electric element and a scroll compression element in a hermetic container, and in the scroll compression element, a plurality of scroll scroll elements are obtained by engaging a driving scroll and a driven scroll. There is a configuration in which gas is sent to the compression space and is sent as high-pressure gas from the compression space whose volume is reduced by the rotation of both scrolls.

As shown in FIGS. 6 and 7, reference numeral 1 denotes a closed container in which an electric element 2 and a scroll compression element 3 are housed. The scroll compression element 3 is
The driving scroll 4, the driven scroll 5, the main frame 6 that supports the driving scroll 4, the auxiliary frame 7 that supports the driven scroll 5, and the driving scroll 4 fixed via a cylindrical ring 8 to move the driven scroll in the axial direction. A regulating member 9 for regulating, an Oldham coupling 10 for rotating the drive scroll 4 and the driven scroll 5 in the same direction are provided.

The drive scroll 4 is provided with a spiral wrap 12 on the lower surface of the end plate 11 and the end plate 1
A drive shaft 13 pivotally supported by the main frame 6 rises from the upper surface of 1 and is connected to the electric element 2. The driven scroll 5 is provided with a spiral wrap 15 that meshes with the wrap 12 on the upper surface of a mirror plate 14, and a driven shaft 16 eccentric to the drive shaft 13 and pivotally supported by the auxiliary frame 7 from the rear surface of the mirror plate 14. It extends downward.

The above scrolls 4 and 5 are engaged with each other in a hollow chamber 17 composed of a main frame 6 and an auxiliary frame 7. Of the scrolls in which the wraps 12 and 15 are engaged with each other, the regulating member 9 arranged on the rear side of the end plate 14 of the driven scroll 5 is fixed to the drive scroll 4 as described above, and the driven scroll 5 has an axial direction. I try to suppress the movement of.

The Oldham's joint 10 is disposed between the end plate 14 and the regulating member 9. The Oldham's joint 10 allows the plurality of compression spaces 18 formed by the wraps 12 and 15 to be engaged with each other from the outside to the inside. Gradually from the low pressure compression space 18a to the intermediate pressure compression space 1a.
8b, the scrolls 4 and 5 are rotated in the same direction while sequentially changing from the intermediate pressure compression space to the high pressure compression space 18c to perform compression.

A suction port 1 is provided on the lower side of the closed container 1.
9, the discharge port 20 is arranged on the upper side, and the gas (refrigerant) entering from the suction port 19 is driven by the scroll 5.
Is fed from the side to the outer compression space 18, and the pressure is increased due to the contraction accompanying the transition of the compression space 18 to the center side,
Gas is sent out above the closed container 1 through the drive scroll 4 side, and is discharged from the discharge port 20 to the outside of the container.

As described above, the scrolls 4 and 5 are formed with passages for passing gas. In the drive scroll 4, a discharge passage 21 extends through the drive shaft 13 in the longitudinal direction thereof. Further, in the driven scroll 5, the gas passage 22 in the driven shaft 16 portion, the suction lateral hole 23 extending from the outer peripheral end of the end plate 14 in the radial direction, and the suction lateral hole 23 opened at the outer peripheral end side on the end plate 14. A suction passage 25 is provided from the suction port 24. Further, an empty chamber 26 is located at the lower side of the driven shaft 16 and is connected to an intake port 19, so that the pressure of the gas is low via the intake port 19, the empty chamber 25 and the intake passage 25. It is supplied to the compression space 18 side.

Since the compression space 18 formed by the meshing portion of the wrap shrinks while moving to the center side by the rotation of the scroll, the outer peripheral portion of the meshing portion is a low pressure compression space 18a, and the inside thereof is at an intermediate pressure. Compression space 18
The pressure increases in the order of b and the high pressure compression space 18c on the center side. A part of the high-pressure gas sent out from the high-pressure compression space 18c through the discharge passage 21 is part of the frames 6 and 7.
Is sent to the hollow chamber 17 made up of, and its pressure is used to press the driven scroll 5 against the drive scroll 4.

That is, the high-pressure gas sent into the hollow chamber 17 is guided around the driven shaft 16 through the lower side of the regulating member 9, and is guided around the driven shaft base of the end plate 14 along the outer periphery of the driven shaft 16. I have to. As shown in FIG. 7, a seal ring 27 that is in sliding contact with the regulating member 9 is attached around the driven shaft, and the high pressure gas is introduced into the space formed by the partition of the seal ring 27, and the pressure (discharge pressure) ), The driven scroll 5 is pressed toward the drive scroll 4 side to ensure the seal at the end of the wrap.

[0011]

By the way, in an air conditioner or the like equipped with the scroll compressor having the above-mentioned structure, the compression ratio (the ratio between the suction pressure and the discharge pressure) of the scroll compressor is changed due to the change in the operating condition of the air conditioning unit. The value of compression ratio = discharge pressure / suction pressure may change significantly. When this compression ratio becomes small, over-compression occurs in the compression space as a feature of the scroll compressor, and the pressure in the space in the middle of compression (the space in the area set as the intermediate pressure) becomes extremely high. Therefore, in the scroll compressor having the above-described structure, the driven scroll is pushed downward by the pressure of the compression space, and the gap in the axial direction tends to increase away from the driving scroll, and thus there is a problem that performance is deteriorated due to leakage. .

In view of the above circumstances, it is an object of the present invention to always press the driving scroll or the driven scroll inward with a required pressure that is not excessive or insufficient.
The purpose is to cancel the overturning moment of the scrolls and prevent performance deterioration due to the separation of both scrolls.

[0013]

The present invention has been made in consideration of the above-mentioned problems, and as in claim 1, an electric element and a scroll compression element are housed, and the scroll compression element is spirally wound on an end plate. -Shaped wrap upright, a drive scroll having a shaft connected to an electric element, and a spiral wrap having an end plate having a shaft eccentric with the center of the shaft of the drive scroll and facing and engaging with the drive scroll. A plurality of compression spaces formed by a driven scroll which is erected upright, a frame which supports the shafts of both scrolls, a drive scroll and a driven scroll which are housed in a hollow chamber formed inside the frame. From inward to low pressure compression space, intermediate pressure compression space,
An Oldham coupling that rotates these scrolls in the same direction so as to perform compression by changing the order of the high-pressure compression space, and an axial direction of the driven scroll that is fixed to the driving scroll and is arranged on the back side of the end plate of the driven scroll. In a scroll compressor configured with a restricting member for restricting the movement of the back scroll of the drive scroll or the driven scroll, a back pressure chamber capable of controlling the internal pressure according to the operating conditions of the compressor is provided. Is.

According to a second aspect of the present invention, in the structure of the first aspect, the back pressure chamber is formed between two seal rings arranged between the rear surface of the end plate of the drive scroll and the frame.

According to a third aspect of the present invention, in the structure of the first aspect, the back pressure chamber is formed between the two seal rings arranged between the rear surface of the end plate of the driven scroll and the frame.

According to a fourth aspect of the present invention, in the structure of the first aspect, the frame is provided with a pressure adjusting valve communicating with the back pressure chamber.

According to a fifth aspect of the present invention, in the configuration of the first aspect, the pressure of the back pressure chamber is set to a value lower than the high pressure by a predetermined value or higher than the low pressure by a predetermined value. is there.

Further, as in claim 6, in the structure of claim 1, the center of the acting force due to the pressure of the back pressure chamber is set eccentrically with respect to the rotation axis of the scroll which receives the pressure. It is a thing.

[0019]

In the first aspect of the present invention, since the back pressure chamber capable of controlling the internal pressure according to the operating condition of the compressor is provided on the back side of the driving scroll or the driven scroll,
Even if overcompression occurs in the meshing part and a force that pushes one scroll downward is generated, a larger force is generated on the back side of the end plate of the other scroll, while if the pressure in the compression space is small, this According to the pressure of the back pressure chamber can be reduced to reduce the pressing force of the other scroll,
It is possible to improve the performance of the compressor by constantly applying the required pressure to the one scroll to the inside in order to cancel the overturning moment of the scroll and keep the end of the lap of the driven scroll and the end plate of the drive scroll in constant contact. .

Further, as in claims 2 and 3, the back pressure chamber is formed between the two seal rings arranged between the rear surface of the end plate of the drive scroll or the driven scroll and the frame, whereby the existing structure is provided. The back pressure chamber can be formed with a simple structure by using the parts, and moreover, both the high pressure side and the low pressure side can be blocked by the two seal rings, and the intermediate pressure chamber can be formed between both seal rings.

Further, by providing the pressure regulating valve communicating with the back pressure chamber in the frame as in claim 4, the back pressure chamber capable of pressure control is formed with a simple structure without using complicated control means. Moreover, since the pressure regulating valve can be mounted on the frame in advance, the workability of assembling the compressor is not impaired.

Further, since the pressure of the back pressure chamber is set to a value lower than the high pressure by a predetermined value or a value higher than the low pressure by a predetermined value, it is possible to surely prevent the above-mentioned overturning moment. Not only the effect can be obtained, but also the moment load acting on the bearing can be reduced, and the partial contact phenomenon of the scroll or shaft and the uneven wear due to this can be prevented.

Further, as described in claim 6, since the center of the acting force due to the pressure in the back pressure chamber is set eccentric with respect to the rotation axis of the scroll receiving the pressure, the moment is exerted on the end plate of the scroll receiving the pressure. Force can be applied, and the rollover moment generated in the scroll can be reliably offset.

[0024]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described in detail based on the embodiments shown in FIGS. It should be noted that the same parts as those of the conventional example shown in FIG. 6 and FIG.
FIG. 1 and FIG. 2 show the first embodiment, and a back pressure chamber 28 is provided on the back side of the drive scroll 4 (or the driven scroll 5), which can control the internal pressure according to the operating conditions of the compressor.
Is provided. This back pressure chamber is a drive scroll 4
2 arranged between the rear surface of the end plate 11 and the main frame 6
The back pressure chamber 28 is formed between two seal rings 29, 30 (the back pressure chamber 28 is disposed between the back surface of the end plate 14 of the driven scroll 5 and the auxiliary frame 7).
It may be formed between 0). Reference numeral 31 is an oil supply hole for the bearing.

FIG. 3 shows another embodiment of the back pressure chamber 2.
8 is formed between one seal ring 29 arranged between the rear surface of the end plate 11 of the drive scroll 4 and the main frame 6 and the clearance of the bearing portion 32 of the main fleme. In this case, the bearing portion 32 is formed with an annular groove 33 communicating with the oil supply hole 31. According to this method, since the seal structure easily reduces the frictional resistance, the input can be reduced.

FIG. 4 shows another embodiment, in which a back pressure chamber 28 is formed between two seal rings 29 and 30 arranged between the rear surface of the end plate 11 of the drive scroll 4 and the main frame 6. At the same time, the main frame 6 is provided with a pressure adjusting valve 34 communicating with the back pressure chamber 28. This pressure regulating valve 3
Reference numeral 4 includes a communication hole 35 formed in the main frame 6, a ball valve 36 that opens and closes the communication hole, and a spring 37 that presses the ball valve. The pressure of the back pressure chamber 28 communicates with the high-pressure upper space of the main frame 6, and the pressure adjusting valve 34 is set to operate at a value lower than this high pressure by a predetermined value.

FIG. 5 shows still another embodiment, in which the back pressure chamber 2 is provided between two seal rings 29, 30 arranged between the rear surface of the end plate 11 of the drive scroll 4 and the main frame 6.
8 and the main frame 6 is provided with a pressure adjusting valve 34 communicating with the back pressure chamber 28. The pressure adjusting valve 34 includes a communication hole 35 formed in the main frame 6 and opening to the back pressure chamber 28, and a ball valve 36 that opens and closes the communication hole.
And a spring 37 for pressing the ball valve, and a hole 38 for communicating the valve chamber and the hollow chamber 17.
The pressure of the back pressure chamber 28 is communicated with the low pressure hollow chamber 17 through the communication holes 35 and 38, and the pressure regulating valve 34 is set to operate at a value higher than the low pressure by a predetermined value.

In the above-mentioned embodiment, as shown in each figure, the center of the acting force due to the pressure of the back pressure chamber 28 is
It is set to be eccentric with respect to the rotation axis of the scroll 4 that receives pressure.

As described above, according to this embodiment, the back pressure chamber 28 whose internal pressure can be controlled according to the operating conditions of the compressor is provided on the back side of the drive scroll 4 (or the driven scroll 5). Therefore, even if over-compression occurs in the meshing portion and a force that pushes one scroll 4 or 5 downward is generated, a larger force than that occurs in the end plate 11 of the other scroll 5 or 4.
Alternatively, when the pressure in the compression space 18 is small, the pressure in the back pressure chamber 28 can be reduced and the pressing force of the other scroll 4 or 5 can be reduced accordingly. , The required pressure which is not excessive or insufficient is always applied to the inner side of one scroll 5 or 4 to cancel the overturning moment of the scroll 4 or 5, and the tip of the wrap 15 of the driven scroll 5 and the end plate 11 of the drive scroll 4 are constantly operated. The performance of the compressor can be improved by bringing them into contact with each other.

Further, the back pressure chamber 28 is provided with two seal rings 29, 30 arranged between the rear surface of the end plates 11, 14 of the drive scroll 4 or the driven scroll 5 and the main frame 6.
By forming the space between the back pressure chamber 28 and the existing components, the back pressure chamber 28 can be formed with a simple structure, and the two seal rings 29 and 30 can be used to shut off both the high pressure side and the low pressure side. A back pressure chamber 28, which is an intermediate pressure chamber, can be formed between both seal rings 29, 30.

Further, by providing the main frame 6 with the pressure adjusting valve 34 communicating with the back pressure chamber 28, the pressure controllable back pressure chamber 28 can be formed with a simple structure without using complicated control means. Moreover, since the pressure adjusting valve 34 can be attached to the main frame 6 in advance, the workability of assembling the compressor is not impaired.

Further, since the pressure in the back pressure chamber 28 is set to a value lower than the high pressure by a predetermined value or higher than the low pressure by a predetermined value, only a certain effect of the above-mentioned overturning moment preventing action can be obtained. Not only that, but also the moment load acting on the bearing portion 32 can be reduced.
Also, it is possible to prevent a one-sided contact phenomenon of the drive shaft 13 and uneven wear due to this.

Further, since the center of the acting force due to the pressure in the back pressure chamber 28 is set eccentrically with respect to the rotational axis of the scroll 4 or 5 which receives the pressure, the end plate 11 of the scroll 4 or 5 which receives the pressure is set. Alternatively, a moment force can be applied to 14, and the overturning moment generated in the scroll 4 or 5 can be reliably offset.

[0034]

As described above, according to the first aspect of the present invention, on the back side of the driving scroll or the driven scroll, the back pressure capable of controlling the internal pressure according to the operating conditions of the compressor is provided. Since the chamber is provided, even if over-compression occurs in the meshing part and a force that pushes one scroll downward is generated, a larger force is generated on the back side of the end plate of the other scroll, while in the compression space When the pressure is small, the pressure of the back pressure chamber can be reduced accordingly to reduce the pressing force of the other scroll. It is possible to cancel the overturning moment of the scroll and make the wrap tip of the driven scroll and the end plate of the drive scroll always contact each other to improve the performance of the compressor.

Further, as in claims 2 and 3, the back pressure chamber is formed between the two seal rings arranged between the rear surface of the end plate of the drive scroll or the driven scroll and the frame, whereby the existing structure is provided. The back pressure chamber can be formed with a simple structure by using the parts, and moreover, both the high pressure side and the low pressure side can be blocked by the two seal rings, and the intermediate pressure chamber can be formed between both seal rings.

Further, by providing the pressure regulating valve communicating with the back pressure chamber in the frame as in claim 4, the back pressure chamber capable of pressure control is formed with a simple structure without using complicated control means. Moreover, since the pressure regulating valve can be mounted on the frame in advance, the workability of assembling the compressor is not impaired.

Further, since the pressure of the back pressure chamber is set to a value lower than the high pressure by a predetermined value or a value higher than the low pressure by a predetermined value as described in claim 5, the above-mentioned action of preventing the overturning moment is sure. Not only the effect can be obtained, but also the moment load acting on the bearing can be reduced, and the partial contact phenomenon of the scroll or shaft and the uneven wear due to this can be prevented.

Further, as described in claim 6, since the center of the acting force due to the pressure in the back pressure chamber is set eccentrically with respect to the rotational axis of the scroll receiving the pressure, the moment is exerted on the end plate of the scroll receiving the pressure. Force can be applied, and the rollover moment generated in the scroll can be reliably offset.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing a first embodiment of a scroll compressor according to the present invention.

FIG. 2 is an explanatory diagram showing a scroll periphery in the first embodiment.

FIG. 3 is an explanatory diagram showing a second embodiment.

FIG. 4 is an explanatory diagram showing a third embodiment.

FIG. 5 is an explanatory diagram showing a fourth embodiment.

FIG. 6 is an explanatory diagram showing a conventional example.

FIG. 7 is an explanatory diagram showing a scroll periphery in a conventional example.

[Explanation of symbols]

 4 Drive Scroll 5 Driven Scroll 9 Control Member 11, 14 End Plate 12, 15 Lap 17 Intermediate Chamber 18 Compression Space 18a Low Compression Space 18b Intermediate Pressure Compression Space 18c High Pressure Compression Space 28 Back Pressure Chamber 29, 30 Seal Ring

Claims (6)

[Claims] 1. A drive scroll having an electric element and a scroll compression element, the scroll compression element having a shaft connected to the electric element by spirally wrapping a scroll plate on the scroll plate, and the drive scroll. A driven scroll having an axis that is eccentric to the center of the shaft and a spiral wrap standing on an end plate that faces and engages with the drive scroll, a frame that axially supports the shafts of both scrolls, and the inside of the frame The plurality of compression spaces formed by the driving scroll and the driven scroll housed in the hollow chamber formed in the above are gradually reduced from the outside to the inside, and a low pressure compression space, an intermediate pressure compression space, and a high pressure compression space. The Oldham coupling that rotates these scrolls in the same direction so as to perform compression by changing in the order of In a scroll compressor, which is arranged on the back side of the end plate and configured to restrict the movement of the driven scroll in the axial direction, a scroll compressor is provided on the back side of the drive scroll or the driven scroll according to operating conditions of the compressor. A scroll compressor having a back pressure chamber capable of controlling the pressure of the scroll compressor. 2. The scroll compressor according to claim 1, wherein the back pressure chamber is formed between two seal rings arranged between the rear surface of the end plate of the drive scroll and the frame. 3. The scroll compressor according to claim 1, wherein the back pressure chamber is formed between two seal rings arranged between the rear surface of the end plate of the driven scroll and the frame. 4. The scroll compressor according to claim 1, wherein the frame is provided with a pressure regulating valve communicating with the back pressure chamber. 5. The scroll compressor according to claim 1, wherein the pressure of the back pressure chamber is set to a value lower than the high pressure by a predetermined value or a value higher than the low pressure to a predetermined value. 6. The scroll compressor according to claim 1, wherein the center of the acting force due to the pressure of the back pressure chamber is set eccentrically with respect to the rotational axis of the scroll which receives the pressure.