JPH08261180A - Scroll compressor - Google Patents

Abstract

PURPOSE: To cool a turn scroll itself, since a delivery temperature high rises to generate excessive stress in a bearing, shaft, etc., from a difference of thermal expansion between turn/fixed scrolls due to insufficient cooling, by cooling only the fixed scroll, in the case of developing a scroll compressor. CONSTITUTION: A cooling passage 11 is provided to open in a barrel plate of a turn scroll 10, to cool it by making a fluid pass through the cooling passage 11, and the fluid of increasing a temperature is discharged to the outside so as to prevent using it as a compressing fluid. Accordingly, since the turn scroll can be directly cooled, a delivery temperature is markedly decreased to enable a life to extend of a member influenced by heat, and compressor performance can be improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a scroll compressor used for air compressors, refrigerating machines, air-conditioning compressors and the like.

[0002]

2. Description of the Related Art As in the oil-free scroll compressor disclosed in Japanese Patent Laid-Open No. 63-125188, in the conventional technology, a cooling fin is provided on a fixed scroll as a scroll cooling method, and cooling is performed from the outside of the scroll. Has been adopted.

Further, as disclosed in Japanese Patent Laid-Open No. 63-123788, a method of cooling a pair of orbiting and fixed scrolls has been proposed, but this proposal is structurally applicable to a double-tooth scroll compressor. It is impossible.

No other application has been found for a method and structure for cooling an orbiting scroll effective for a double-tooth scroll compressor.

[0005]

DISCLOSURE OF THE INVENTION The present invention has been made in consideration of a double-toothed scroll compressor, and more particularly to a scroll compressor capable of favorably cooling an orbiting scroll.

An object of the present invention is to solve the problems of the prior art as described above, and to develop a large oil-free scroll compressor, for example, and to adopt a cooling system for an orbiting scroll which is adopted. A toothed scroll compressor is provided.

In a scroll compressor having no cooling structure in the compression process, the discharge fluid temperature becomes as high as about 200 ° C. only by external cooling of the fixed scroll. Therefore, due to the thermal expansion of the orbiting scroll and the fixed scroll, the wraps contact each other, the life of the tip seal for gap seal is shortened, and the orbiting scroll causes a relatively large thermal expansion by cooling only the fixed scroll. Various problems occur such as excessive stress on the shaft.

In order to solve these technical problems, the present invention allows a fluid to pass through a cooling passage provided in an orbiting scroll,
In addition, the object is to cool the orbiting scroll by discharging the fluid whose temperature has risen to the outside.

[0009]

The technical means of the present invention will be described. The scroll compressor according to the present invention includes fixed scrolls, orbiting scrolls, crankshafts, auxiliary cranks, bearings, etc. as its constituent elements.

A cooling passage is provided on the body plate surface of the orbiting scroll. Due to the eccentric movement of the orbiting scroll, the compression space of the orbiting scroll and the fixed scroll is gradually reduced, and the compression of the fluid proceeds. In this compression process, the temperature of the compressed fluid becomes high, and accordingly, the fixed scroll and the orbiting scroll also become high in temperature. The fixed scroll is cooled by fins provided outside. On the other hand, the orbiting scroll is cooled by the cooling fluid flowing through the cooling passages, which is separated from the compression fluid. Here, the compression fluid and the cooling fluid are separated from each other because the dust is removed by the filter when the compression fluid is sucked in through the fluid suction port. This is to prevent the coming into the scroll wrap. The fluid that has cooled the orbiting scroll is discharged to the outside as it is (means related to claim 1).

By using the fluid not containing dust as the cooling fluid, it is not necessary to separate the orbiting scroll inlet portion of the cooling passage from the compression fluid outside. For this reason, a part of the compression fluid is supplied for cooling the orbiting scroll through a dust removal filter having a large filtration area (claim 2).

Further, by providing the outlet of the orbiting scroll cooling passage near the external discharge port and at a position away from the suction start position of the scroll wrap, the cooling fluid and the compression fluid of the external discharge port are separated from the outlet. Eliminate the need (means related to claim 3).

A suction filter is provided at the inlet to prevent the intrusion of dust expected when a problem occurs in the isolation of the fluid at the inlet in the structure of claim 1 (related to claim 4). Means).

A plurality of the cooling passages are provided (means relating to claim 5).

The cooling passage has a shape such as a round shape or a square shape that can be easily processed, or a large cooling effect such as a chrysanthemum shape or a fin shape. ).

[0016]

The operation of the scroll compressor according to the present invention will be described. A scroll compressor compresses fluid by causing an orbiting scroll to eccentrically move with respect to a fixed scroll. A crankshaft is used to impart this eccentric motion to the orbiting scroll.

A passage for cooling is provided on the body plate surface of the orbiting scroll. Due to the eccentric movement of the orbiting scroll, the compression space of the orbiting scroll and the fixed scroll is gradually reduced, and the compression of the fluid proceeds. In this compression process, the temperature of the compressed fluid becomes high, and accordingly, the fixed scroll and the orbiting scroll also become high in temperature. The fixed scroll is cooled by the fins provided outside, while the orbiting scroll is cooled by the cooling fluid separated from the compression fluid. A gas is mainly used as the cooling fluid. The reason why the compression fluid and the cooling fluid are separated here is that the dust is removed by the filter when the compression fluid is sucked in through the fluid inlet, but the cooling fluid is This is to prevent dust from entering the scroll wrap. The fluid that has cooled the orbiting scroll is discharged to the outside as it is. As a result, the intrusion of dust and the cooling air that has become high temperature are not compressed, and the orbiting scroll can be cooled satisfactorily (operation related to claim 1).

If a fluid containing no dust is used as the cooling fluid, it is not necessary to separate the orbiting scroll inlet portion of the cooling passage from the compressed air fluid outside. For this purpose, part of the compressed air that has passed through the dust removing filter may be supplied to the orbiting scroll as a cooling fluid. By adopting a filter having a larger filtration area than that of claim 1, the life of the filter can be kept constant, the isolation structure is reduced, and the scroll structure is simplified (related to claim 2). Action).

Further, by providing the outlet of the orbiting scroll cooling passage near the external discharge port and at a position away from the suction start position of the scroll wrap, the cooling fluid and the compression fluid of the external discharge port can be separated from the outlet. No longer needed. Thereby, the scroll structure can be further simplified (operation related to claim 3).

In the case of the structure according to the first aspect, when there is a problem in separating the fluid at the inlet, dust may enter, but as a countermeasure against this, a suction filter is provided at the inlet. Ingress of dust is prevented (operation related to claim 4).

By providing a plurality of cooling passages, the cooling effect of the orbiting scroll is increased (operation related to claim 5).

By making the shape of the cooling passage into a round shape or a square shape, it becomes easy to process, and by making it into a chrysanthemum shape or a fin shape, a large cooling effect can be obtained. It is possible to cool the orbiting scroll which is excellent in terms of performance (operation related to claim 6).

[0023]

Embodiments of the present invention will be described with reference to FIGS. FIG. 1 shows an example of a scroll compressor structure which is a premise of the present invention. In the scroll compressor, power is transmitted from the motor to the V pulley 6 by the V belt, whereby the crankshaft 4 rotates, and the timing pulley 8 and the timing belt 7 for synchronization also rotate the auxiliary crank 5 in synchronization with the crankshaft 4. To do. As a result, the orbiting scroll 1 has a left fixed scroll 2 and a right fixed scroll 3
Perform an eccentric movement between. The fluid to be compressed is from the suction port,
It is sucked into the compression chamber formed by the wrap 1A of the orbiting scroll 1 and the wrap 2 (3) A of the left fixed scroll 2 and the right fixed scroll 3, and rises to a predetermined pressure as the rotation of the orbiting scroll proceeds, and then discharges. It is discharged from the outlet 9.

FIG. 2 shows an embodiment according to claim 1. In the figure, the shaded portion shows the cross section of the right fixed scroll 3, and the orbiting scroll is not shown in order to clearly show the tip. At least one body plate of the orbiting scroll 10 is arranged substantially parallel to the diametrical direction thereof, that is, substantially parallel to the end face of the copper plate,
In the illustrated example, four cooling passages 11 are opened. An end portion of the cooling passage 11 has an inlet communication passage 11A and an outlet communication passage 11 that are partially opened to the end surface of the body plate of the orbiting scroll.
The inlet communication passage 11A is in contact with the external inlet cooling passage 12 provided in the right fixed scroll via the sealing material 12A. Therefore, the cooling fluid flows from the inlet cooling passage 12 through the cooling passage 11 of the orbiting scroll 10 while being separated from the compression fluid, and the outlet communication passage 11B forms a similar structure to the external outlet cooling passage 13 and the scroll compressor. It is structured to be discharged to the outside.
As a result, the orbiting scroll 10 is cooled. At this time, since the cooling passage is isolated from the compressed air passage, even if dust is mixed in the gas that is the cooling fluid flowing through the cooling passage, the compressed air is not contaminated.

FIG. 3 shows an embodiment according to claim 2. In this figure, the hatched portion shows the cross section of the right fixed scroll as in FIG. The orbiting scroll 15 is provided with a cooling passage 16. In the illustrated embodiment, the external inlet cooling passage and the inlet communication passage are omitted, and the external outlet cooling passage 17 and the outlet communication passage 16B are provided. Inhalation filter 14
A part of the compressed air that has passed through flows through the cooling passage 16 that opens to the outer peripheral surface or the end surface of the body plate, and the outlet communication passage 16B
Is discharged from the external outlet cooling passage 17 via the. At this time, the outlet of the cooling passage 16 and the external outlet cooling passage 17 are in contact with each other via the same sealing material as the seal 12A shown in the embodiment of FIG. 6, and the cooling fluid whose temperature has risen is used as the compression fluid. It prevents it from being used. According to the present embodiment, since the external inlet cooling passage and the outlet communication passage as shown in FIG. 2 are not required, the structure is simplified.

FIG. 4 shows an embodiment of claim 3. In this figure, the hatched portion shows the cross section of the right fixed scroll. The orbiting scroll 18 is provided with a cooling passage 19, and the cooling passage 19 is connected to an outlet communication passage 19B.
Part of the compressed air that has passed through the suction filter 14 flows through the cooling passage 19 and the communication passage 19B, and the external outlet cooling passage 2
Emitted from 0. At this time, the outlet of the communication passage 19B connected to the cooling passage 19 and the external outlet cooling passage 20 are not in contact with each other, and these two passages are arranged close to each other.
Further, by disposing the scroll wrap at a remote position apart from the suction start position 21, the orbiting scroll is prevented from being used as the compression fluid for the cooling fluid whose temperature has risen after cooling. According to this embodiment, the inlet and outlet communication paths as in the above embodiments are not provided, and the structure is simpler.

FIG. 5 shows an embodiment of claim 4. This embodiment is an example in which a filter 22 corresponding to the suction filter 14 is arranged in the external inlet cooling passage 12 of the embodiment shown in FIG. The other structure is the same as that of the embodiment shown in FIG. 2, and the description thereof is omitted. According to this embodiment, when the cooling air leaks from the cooling passage, dust is prevented from being removed from the cooling air by the filter and entering the scroll wrap.

FIG. 7 shows an embodiment according to claim 6. Figure 7
In the orbiting scroll 1 shown in each of the above embodiments
The cross-sectional shape of the cooling passages provided in 0, 15 and the like is round ((b) in FIG. 7), rectangular ((c) in FIG. 7) or the like to facilitate workability, and the cross-sectional shape (see FIG. (D)), the fin shape ((e) in FIG. 7), etc. to improve the cooling performance.

In each of the above embodiments, the orbiting scroll can be directly cooled by the cooling fluid, so that the temperature of the entire orbiting scroll can be lowered by an average of about 40 ° C.,
Further, the life of the tip seal, the bearing, etc. can be extended, and the stress applied to the shaft and the bearing can be reduced by cooling the fixed scroll and the orbiting scroll, and the performance as a scroll compressor can be improved by 4 to 5%. .

[0030]

As described above, according to the present invention, since the orbiting scroll can be directly cooled in the double-toothed scroll compressor, the temperature of the orbiting scroll as a whole can be significantly reduced as compared with the conventional one. As a result, the thermal expansion of the scroll can be reduced, the gap can also be reduced, and the life of the tip seals, bearings, etc. can be prevented from being shortened due to the influence of heat. Further, since both the fixed scroll and the orbiting scroll are cooled, the difference in thermal expansion is reduced, and excessive stress is not generated in the bearing and the shaft. Also, the temperature of the discharged air can be reduced. From the above effects, the performance as a scroll compressor is improved and the reliability can be improved.

[Brief description of drawings]

FIG. 1 is a structural diagram of an example of a scroll compressor which is a premise of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG. 1 showing an embodiment of a scroll compressor according to the present invention.

FIG. 3 is a cross-sectional view showing another embodiment of the scroll compressor according to the present invention.

FIG. 4 is a sectional view showing still another embodiment of the scroll compressor according to the present invention.

FIG. 5 is a sectional view showing another embodiment of the scroll compressor according to the present invention.

FIG. 6 is a schematic sectional view showing a relationship between an orbiting scroll and an external outlet cooling passage.

FIG. 7 is a view showing various shapes of cooling passages in the scroll compressor according to the present invention.

[Explanation of symbols]

1 ... Orbiting scroll 2 ... Left fixed scroll 3 ... Right fixed scroll 4 ... Crank shaft 5 ... Auxiliary crank 6 ... V pulley 7 ... Timing belt 8 ... Timing pulley 9 ... Discharge port 10 ... Orbiting scroll 11 ... Cooling passage 12 ... External Inlet cooling passage 13 ... External outlet cooling passage 14 ... Suction filter 15 ... Orbiting scroll 16 ... Cooling passage 17 ... External outlet cooling passage 18 ... Orbiting scroll 19 ... Cooling passage 20 ... External outlet cooling passage 21 ... Scroll wrap suction start position 22 ... Filter

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Machida 502 Kintatemachi, Tsuchiura, Ibaraki Prefecture

Claims (6)

[Claims] 1. A double-toothed scroll compressor for compressing fluid sucked from an intake port by sandwiching an orbiting scroll having scroll wraps provided on both sides of one body plate by two fixed scrolls and eccentrically moving the orbiting scroll. In the above, by providing a cooling passage in the body plate of the orbiting scroll and providing a passage separate from the compression suction fluid from the outside of the scroll to the orbiting scroll, the cooling fluid is directly passed through the cooling passage. A scroll compressor that cools an orbiting scroll and discharges the cooling fluid to the outside of the scroll through a passage isolated from the compressed suction fluid. 2. A double-toothed scroll compressor for compressing fluid sucked from an intake port by sandwiching an orbiting scroll having scroll wraps provided on both sides of one body plate by two fixed scrolls and eccentrically moving the orbiting scroll. In the above, a cooling passage is opened in the body plate of the orbiting scroll, and a part of the fluid taken in as suction fluid for compression from the outside of the scroll is passed through the cooling passage to cool the orbiting scroll, and the fluid used for cooling is compressed. A scroll compressor designed to be discharged to the outside of the scroll by a passage isolated from the intake fluid. 3. A double-toothed scroll compressor for compressing fluid sucked from an intake port by sandwiching an orbiting scroll having scroll wraps provided on both surfaces of one body plate by two fixed scrolls and eccentric movement of the orbiting scroll. In the above, a cooling passage is opened in the body plate of the orbiting scroll, and a part of the fluid taken in as suction fluid for compression from the outside of the scroll is passed through the cooling passage to cool the orbiting scroll. It is not separated from the intake fluid, the external discharge passage and the orbiting scroll cooling passage are brought close to each other, the scroll lap intake start position is isolated, and the fluid whose temperature has risen is used as the compression fluid. A scroll compressor that suppresses this and discharges the fluid whose temperature has risen to the outside of the scroll. 4. The scroll compressor according to claim 1, wherein a filter equivalent to the one used for intake fluid is provided at the inlet of the cooling fluid passage in case the isolation of the cooling fluid passage is lost. Things to set up. 5. The scroll compressor according to claim 1, wherein a plurality of cooling fluid passages are provided. 6. The scroll compressor according to claim 1, wherein the cooling fluid passage has a round shape,
Scroll compressor in the shape of square, chrysanthemum, fin, etc.