JP5314456B2 - Air-cooled scroll compressor - Google Patents

Description

  The present invention relates to an air-cooled scroll compressor, and more particularly to an air-cooled scroll compressor provided with a cooling fan for cooling a turning scroll and a fixed scroll.

  Conventionally, a scroll compressor is known as one of compressors used for air compression, refrigeration and air conditioning. The scroll compressor generally includes a turning scroll in which a turning wrap is erected on an end plate pivotally supported on a drive shaft via a bearing, and a fixed scroll in which a fixing wrap is erected on the end plate. Are formed by forming a hermetic compression chamber between the swirl wrap and the fixed wrap.

  In the scroll compressor thus configured, the volume of the compression chamber gradually decreases in the centripetal direction due to the relative movement of the orbiting wrap and the fixed wrap by rotating the drive shaft eccentrically, and the compression chamber The fluid sucked from the outer peripheral portion is compressed and then discharged after being guided to the center portion.

At this time, the fluid is gradually compressed along with the orbiting motion of the orbiting scroll, and gradually becomes a high temperature and high pressure state by the compression heat toward the center of the compression chamber. Due to this high-temperature and high-pressure working fluid, the parts constituting the orbiting scroll and the fixed scroll such as the orbiting wrap, the fixed wrap, the end plate on which the orbiting wrap and the fixing wrap are erected are formed at a high temperature. Therefore, cooling is necessary.

  A scroll compressor provided with means for cooling the orbiting scroll and the fixed scroll that have become high temperature due to compression heat is disclosed in, for example, Patent Document 1. FIG. 7 is a configuration diagram of a conventional scroll compressor disclosed in Patent Document 1. In FIG. A suction port 118 is provided at the center of the scroll compressor main body 102 constituted by a combination of the orbiting scroll 110 and the fixed scroll 108, and the main shaft 116 protruding from the casing 104 on the orbiting scroll 110 side of the scroll compressor main body 102. A centrifugal fan 106 constituting the discharge unit 120 is attached to the outer periphery. Further, the discharge unit 120 of the centrifugal fan 106, the orbiting scroll 110 of the scroll compressor main body 102, and the compression heat dissipation unit 112 of the fixed scroll 108 are connected from the outside of the casing 104 by a blower duct 114 having a bent portion, and centrifugal In the scroll compressor in which the cooling air discharged from the fan 106 is introduced into the compression heat dissipating unit 112 through the air duct 114 and discharged from the exhaust port 122 on the opposite side, in the flow path formed by the air duct 114. In addition, a diversion guide 124 including a bent portion is provided for flowing a larger amount of cooling air than the amount of cooling air introduced into the compression heat dissipation portion of the fixed scroll 108 compared with the amount of cooling air introduced into the compression heat dissipation portion of the orbiting scroll 110. A scroll compressor is disclosed.

Japanese Utility Model Publication No. 2-94386

  However, in the scroll compressor disclosed in Patent Document 1, although the scroll compressor body 102 can be cooled by the air introduced from the air duct 114, the fluid (air) compressed by the scroll compressor body 102 Is not particularly devised, and since fluid (air) at atmospheric pressure is introduced, an increase in the amount of air discharged from the compressor body 102, that is, an increase in the amount of air per unit power, that is, energy saving. There is a problem that it cannot be planned. Further, since the suction pressure of the fluid (air) to the scroll compressor body 102 is atmospheric pressure, the compression ratio in the scroll compressor is difficult to increase and the compression efficiency is low, so the fluid (air) is compressed to the target pressure. As a result, the discharge temperature becomes high, and there is a problem that the apparatus (the centrifugal fan 106 in FIG. 7) required for cooling must be enlarged.

  Accordingly, in view of the problems of the prior art, the present invention can cool the orbiting scroll and the fixed scroll without increasing the size of the cooling device, and increase the discharge air amount, that is, the air amount per unit power. It is an object of the present invention to provide a scroll compressor that can save energy by increasing the amount of discharge and reduce the discharge temperature by improving the compression ratio.

In order to solve the above-mentioned problems, in the present invention, a revolving scroll in which a revolving wrap is erected on an end plate housed in a compressor casing and supported so as to be revolving on a drive shaft, and the revolving scroll is provided facing the revolving scroll. And a fixed scroll having a fixed wrap standing on the end plate, forming a compression chamber for compressing fluid by overlapping the swirl wrap and the fixed wrap, and a cooling fan attached to the drive shaft A compressor body cooling duct is provided for guiding and introducing the discharged cooling air into the compressor casing containing the compression chamber, and the back side of the orbiting scroll and the fixed scroll accommodated in the compressor casing are provided. positive pressure the cooling air on at least one of the front side is supplied to cool the heat of compression generated in the compression chamber, it is generated by the cooling fan The suction communication passage to flow through a portion of the air flow provided via the suction communication passage, characterized in that a part of the air flow discharged from the cooling fan was set to be introduced from the outer peripheral side of the compression chamber And

By introducing a positive pressure air flow generated by a cooling fan attached to the drive shaft into the compression chamber of the scroll compressor through the suction communication passage, the pressure of the air introduced into the compression chamber is at atmospheric pressure. There is no positive pressure higher than atmospheric pressure. By introducing air in a positive pressure state into the compression chamber, the amount of air per unit power can be increased and an energy saving effect can be obtained.

Further, the suction communication passage is a suction connection passage through which cooling air discharged from the cooling fan flows separately from the compressor main body cooling duct, and the suction connection passage is connected to the compressor main body. It is provided apart from the cooling duct, and a part of the cooling air discharged from the cooling fan can be introduced into the compression chamber from the outer peripheral side through the suction connection passage.

  Accordingly, since cooling air can be introduced into the compressor casing via the compressor body cooling duct, the orbiting scroll and the fixed scroll can be cooled, and the cooling chamber can be cooled from the suction connection passage. Since the cooling air that has been brought into a positive pressure state by the action of the fan is introduced as the compression fluid, the compression ratio in the compression chamber can be kept small, and the compression efficiency is increased. Therefore, it is possible to increase the amount of air that is compressed and discharged by the air-cooled scroll compressor, increase the amount of air per unit power and obtain an energy saving effect, and further reduce the discharge temperature of the compressed air Can be made.

  Furthermore, since the cooling air is introduced from the outer peripheral side of the compression chamber, the arrangement for introducing the air into the compression chamber is not complicated, and the connection between the suction connection passage and the compression chamber is easy. Therefore, it is also easy to modify the existing equipment that does not have the suction connection passage to form the present invention.

  Furthermore, by not branching the compressor body cooling duct and providing the suction connection passage in a separate system from the compressor body cooling duct, the cooling air flowing through the compressor body cooling duct is not branched. Non-uniform flow such as pulsation does not occur in the flow of cooling air flowing in the compressor body cooling duct, and the orbiting scroll and the fixed scroll can be cooled stably.

Further, the suction connection passage is provided with dust removing means for removing dust and dust in the cooling air flowing through the suction connection passage.
Depending on the intended use of compressed air compressed with an air-cooled scroll compressor, it is often required that foreign substances such as dust and dirt are not mixed in the compressed air. Dust and dust in the cooling air introduced into the chamber can be removed, and compressed air free from dust and dirt can be obtained. For example, a filter can be used as the dust removing means.
Thereby, it is possible to maintain the sealing effect of the tip seal provided at the tip of the fixed scroll and the orbiting scroll lap and the tip seal for a longer period of time, and the energy saving effect due to the increase in the air amount per unit power of the present invention is further improved. It can be stably maintained over a long period of time.

The suction connection passage can be removed and replaced.
Thereby, by preparing a plurality of suction connection passages having different cross-sectional areas, they can be removed and replaced as necessary, and the suction connection passage suitable for the operating state of the air-cooled scroll compressor can be used.

Further, the suction connection passage is provided with changing means capable of changing the cross-sectional area of the passage.
Thereby, the suction connection passage suitable for the operating state of the air-cooled scroll compressor can be used.

Further, the suction communication passage is a branch passage which is branched to the compressor body cooling duct, a part of the cooling air discharged from the cooling fan can be introduced from the outer peripheral side to the compression chamber through the branch passage It is characterized by that.

Thereby, since cooling air can be introduced into the compressor casing through the compressor body cooling duct, the orbiting scroll and the fixed scroll can be cooled, and the orbiting scroll and the orbiting scroll can be cooled by the compression heat generated in the compression chamber. It is possible to prevent the fixed scroll from becoming hot.
Further, the cooling air is introduced into the compression chamber as a compression fluid (air) through a branch passage branched from the compressor body cooling duct. Since the cooling air is in a positive pressure state where the pressure is higher than the atmospheric pressure by the action of the cooling fan, the compression ratio in the compression chamber is increased by introducing the cooling air into the compression chamber as a compression fluid. It can be kept small, and the compression efficiency becomes high. Therefore, it is possible to increase the amount of air that is compressed and discharged by the air-cooled scroll compressor, increase the amount of air per unit power and obtain an energy saving effect, and further reduce the discharge temperature of the compressed air Can be made.

  Furthermore, since the cooling air is introduced from the outer peripheral side of the compression chamber, the arrangement for introducing the air into the compression chamber is not complicated, and the branch passage and the compression chamber are easily connected. Therefore, it is also easy to remodel an existing facility that does not have a branch passage into the form of the present invention.

Further, the branch passage is provided with dust removing means for removing dust and dust in the cooling air flowing through the branch passage.
Thereby, dust and dust in the cooling air introduced into the compression chamber can be removed, and compressed air free from dust and dirt can be obtained. Thereby, it is possible to maintain the sealing effect of the tip seal provided at the tip of the fixed scroll and the orbiting scroll lap and the tip seal for a longer period of time, and the energy saving effect due to the increase in the air amount per unit power of the present invention is further improved. It can be stably maintained over a long period of time.

In addition, a passage for guiding and introducing air discharged from a fan of a motor for rotating the drive shaft into the branch passage is provided.
Thereby, the air discharged from the fan of the motor can be introduced into the compression chamber together with the cooling air flowing through the branch passage, and the air discharged from the fan of the motor can be effectively utilized. Further, in order to merge the air discharged from the motor fan with the cooling air flowing through the branch passage, the cooling air is branched from the compressor body cooling duct to the branch passage by the amount of air discharged from the motor fan. The amount can be reduced, and sufficient cooling air can be secured from the compressor body cooling duct to be introduced into the compressor casing for cooling.
Since air from the motor fan is in a positive pressure state where the pressure is higher than atmospheric pressure, there is no particular problem by joining the cooling air flowing through the branch passage.

  As described above, according to the present invention, it is possible to cool the orbiting scroll and the fixed scroll of the air-cooled scroll compressor without increasing the size of the compressor body cooling device, and to increase the discharge air amount, unit. It is possible to provide an air-cooled scroll compressor that can obtain an energy-saving effect due to an increase in the amount of air per motive power and that can lower the discharge temperature by improving the compression ratio.

1 is a sectional view of an air-cooled scroll compressor in Embodiment 1. FIG. 6 is a cross-sectional view of an air-cooled scroll compressor in Embodiment 2. FIG. 6 is a cross-sectional view of an air-cooled scroll compressor in Example 3. FIG. 6 is a cross-sectional view of an air-cooled scroll compressor in Embodiment 4. FIG. 6 is a cross-sectional view of an air-cooled scroll compressor in Embodiment 5. FIG. FIG. 6 is a cross-sectional view of an air-cooled scroll compressor in Example 6. It is a block diagram of the conventional scroll compressor.

  Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the drawings. However, the dimensions, materials, shapes, relative arrangements, and the like of the components described in this embodiment are not intended to limit the scope of the present invention unless otherwise specified, but are merely illustrative examples. Not too much.

(Constitution)
FIG. 1 is a cross-sectional view of the air-cooled scroll compressor according to the first embodiment.
First, the structure of the air-cooled scroll compressor in Example 1 is demonstrated based on FIG.
In FIG. 1, reference numeral 2 denotes a compressor casing forming an outer frame of the air-cooled scroll compressor 1, and the compressor casing 2 protrudes on the opposite side to the opening of the casing body 4 and a casing body 4 that is open on one side. And a cylindrical bearing portion 6 formed in this manner.

  Reference numeral 8 denotes a compression portion that forms the main body of the air-cooled scroll compressor 1, and the compression portion 8 is located on the casing main body 4 side of the compressor casing 2 and fixed to the casing main body 4. A scroll 10 is provided in the casing body 4 so as to face the fixed scroll 10. The orbiting scroll 14 forms a compression chamber 18 described later between the scroll 10 and the bearing of the compressor casing 2. Rotatingly supported by the part 6 via a bearing 20, one end side is connected to the orbiting scroll 14 as a crank in the casing body 4, and the other end side is schematically constituted by a drive shaft 22 protruding from the bearing part 6. The drive shaft 22 is connected to a pulley 24 for being driven by a motor (not shown) via a belt (not shown). The drive shaft 22 may be connected to the motor via a shaft coupling.

  The fixed scroll 10 is erected on the rear surface of the end plate 11, the end of the end plate 11, a spiral fixed wrap 12 with the center of the end plate 11 serving as a winding start end and the outer peripheral side serving as an end of winding, and the front surface of the end plate 11. A plurality of heat dissipating plates 13 are provided on the side.

  Further, the orbiting scroll 14 is roughly constituted by an end plate 15 and a spiral orbiting wrap 16 which is erected on the front surface of the end plate 15 and has the center of the end plate 15 as a winding start end and the outer peripheral side as a winding end end. ing. Tip seals (not shown) for performing sealing are disposed at the respective distal ends of the fixed wrap 12 and the turning wrap 16.

  The turning wrap 16 of the orbiting scroll 14 is disposed so as to overlap the fixed wrap 12 of the fixed scroll 10 while being shifted by a predetermined angle, and between the fixed wrap 12 of the fixed scroll 10 and the turning wrap 16 of the orbiting scroll 14. A compression chamber 18 is formed.

  The compression unit 8 is connected to the crank of the drive shaft 22 by rotationally driving the drive shaft 22 to which a pulley 24 for being driven by a motor (not shown) via a belt (not shown) is connected. The orbiting scroll 14 is turned with a desired turning radius with respect to the fixed scroll 10. As a result, cooling air, which will be described later, sucked into the compression chamber 18 from the outer periphery side is sequentially compressed and communicated to the compressed air supply destination from the discharge port 26.

  Reference numeral 28 denotes a compressor main body cooling duct provided from the front side of the compressor casing 2 to the rear side of the fixed scroll 10, and the compressor main body cooling duct 28 is located on the rear side of the compressor casing 2. A cooling fan casing 30 extending substantially parallel to the casing main body 4 and one side surface of the casing main body 4 and the fixed scroll 10, and the upstream side communicates with the cooling fan casing 30 and serves as a cooling air passage to be described later. A U-shaped passage is configured by the duct 32 and the fixed scroll cooling duct 34 provided so as to cover the front side of the fixed scroll 10 and communicating with the cooling duct 32. Further, the casing 30 of the cooling fan is provided with an introduction port 38 into which the tip of the bearing portion 6 is inserted and for introducing air to the centrifugal fan 36 described later between the bearing portion 6 and the cooling fan casing 30.

  The compressor main body cooling duct 28 uses the outside air introduced into the cooling fan casing 30 from a centrifugal fan 36, which will be described later, as cooling air, and the cooling air is passed through the cooling duct 32 and the inlet 39 to the casing 2. In addition to being supplied to the rear side of the orbiting scroll 14, it is supplied to the front side of the fixed scroll 10 that is in the fixed scroll cooling duct 34.

Reference numeral 36 denotes a centrifugal fan accommodated in the casing 30 of the cooling fan of the compressor body cooling duct 28, and is configured as a sirocco fan.
Then, the centrifugal fan 36 is rotated together with the drive shaft 22 to suck in outside air from the inlet 38 formed in the cooling fan casing 30 of the compressor body cooling duct 28 in the direction of arrow A in FIG. The sucked air is discharged into the casing 30 of the cooling fan by utilizing the centrifugal force generated by a large number of blades that circulate, and flows as cooling air in the compressor body cooling duct 28.

Reference numeral 48 denotes a suction connection passage provided in the cooling fan casing 30 separately from the cooling duct 32 so as to allow cooling air discharged from the centrifugal fan 36 to flow therethrough. The suction connection passage 48 is such that a part of the cooling air discharged from the centrifugal fan 36 flows into the suction connection passage 48 and the cooling air flowing through the suction connection passage 48 is introduced into the compression chamber 18 from the outer peripheral side. It is a thing.
The amount of air discharged from the centrifugal fan 36 and flowing into the suction connection passage 48 is a damper that can set the passage diameter of the suction connection passage 48 so that a desired amount flows in advance or can adjust the opening degree of the suction connection passage 48. It is possible to adjust the damper opening by adjusting the opening of the damper or by changing the passage sectional area by providing means capable of changing the passage sectional area of the suction connection passage 48.

(Operation)
The operation of the scroll compressor according to the first embodiment configured as described above will be described.

First, the compression operation will be described.
When the motor (not shown) is driven, the drive shaft 22 rotates via a belt (not shown) and the pulley 24 by driving the motor. When the turning scroll 14 is turned by the rotation of the drive shaft 22, the compression chamber 18 formed between the fixed wrap 12 of the fixed scroll 10 and the turning wrap 16 of the turning scroll 14 is continuously reduced toward the center side. As a result, the positive pressure cooling air introduced from the suction connection passage 48 on the outer peripheral side of the compression chamber 18 is sequentially compressed and discharged from the discharge port 26 so as to communicate with the compressed air supply destination.

Next, the cooling operation of the air-cooled scroll compressor will be described.
When the drive shaft 22 rotates via a belt (not shown) and a pulley 24 by driving the motor (not shown), the orbiting scroll 14 turns to compress the cooling air, and at the same time, the centrifugal fan 36 rotates. To do. As a result, the centrifugal fan 36 sucks outside air from the introduction port 38 of the compressor body cooling duct 28 and discharges the outside air into the compressor body cooling duct 28 through the blades of the centrifugal fan 36 that circulates. The air discharged into the compressor body cooling duct 28 flows through the cooling duct 32 as cooling air.

A part of the cooling air flowing in the cooling duct 32 is supplied to the back side of the orbiting scroll 14 in the compressor casing 2 through the inlet 39 to cool the orbiting scroll 14 .
Further, a part of the cooling air flowing in the cooling duct 32 is supplied to the front side of the fixed scroll 10 via the fixed scroll cooling duct 34 to cool the fixed scroll 10.
The cooling air that has cooled the orbiting scroll 14 and the cooling air that has cooled the fixed scroll 10 are discharged to the outside in the flow of B and C shown in FIG.
A part of the cooling air flowing in the cooling duct 32 may be supplied to at least one of the rear side of the orbiting scroll 14 or the front side of the fixed scroll 10.

  The cooling air flowing through the suction connection passage 48 is introduced into the compression chamber 18 from the outer peripheral side. Then, as the orbiting scroll 14 revolves, the compression chamber 18 continuously shrinks, whereby the cooling air introduced into the compression chamber 18 from the outer peripheral side is gradually compressed and moves toward the center of the compression chamber 18. Then, the compressed air is discharged from the discharge port 26 so as to communicate with the supply destination.

In the air-cooled scroll compressor 1 having the configuration and operation in the first embodiment described above, the cooling air is supplied to the rear side of the orbiting scroll 14 in the compressor casing 2 and for cooling the fixed scroll through the cooling duct 32. Since the orbiting scroll 14 and the fixed scroll 10 can be cooled by supplying to at least one of the front sides of the fixed scroll 10 in the duct 34, the orbiting scroll 14 and the fixed scroll are generated by the compression heat generated in the compression chamber 18. It can prevent that 10 becomes high temperature.

  Further, the cooling air is introduced into the compression chamber 18 as a compression fluid via the suction connection passage 48. Since the cooling air is in a positive pressure state in which the pressure is higher than the atmospheric pressure due to the action of the centrifugal fan 36, the cooling air is introduced into the compression chamber 18 as a compression fluid, so that the compression in the compression chamber 18 is performed. The ratio can be kept small, and the compression efficiency becomes high. Therefore, the amount of air compressed and discharged by the air-cooled scroll compressor 1 can be increased, and an energy saving effect can be obtained by increasing the amount of air per unit power. Furthermore, the discharge temperature of compressed air can be reduced by keeping the compression ratio small.

  Furthermore, the cooling air flowing through the cooling duct 32 is not branched by providing the suction connection passage 48 for introducing the cooling air into the compression chamber 18 in a separate system from the cooling duct 32 without branching the cooling duct 32. Therefore, nonuniform flow such as pulsation does not occur in the flow of the cooling air flowing in the cooling duct 32, and the orbiting scroll 14 and the fixed scroll 10 can be cooled stably.

  Further, since the cooling air is introduced from the outer peripheral side of the compression chamber 18, the arrangement relating to air introduction is not complicated, and the connection between the suction connection passage 48 and the compression chamber 18 is easy. Therefore, it is easy to remodel existing equipment that does not have the suction connection passage 48 and remodel it into the form of the first embodiment.

FIG. 2 is a cross-sectional view of the air-cooled scroll compressor in the second embodiment.
The air-cooled scroll compressor in the second embodiment has the same configuration and operation as the air-cooled scroll compressor in the first embodiment shown in FIG. 1 except that a dust removing device 52 is provided in the suction connection passage 48. Therefore, description is abbreviate | omitted regarding the same structure and operation | movement as the air-cooling type scroll compressor in Example 1 shown in FIG. 1, and the same code | symbol shall represent the same thing.

In the air-cooled scroll compressor 1 according to the second embodiment illustrated in FIG. 2, the dust removing device 52 is provided in the suction connection passage 48. The dust removing device 52 includes a casing 56 and a filter 54 that is housed in the casing 56 and removes dust and dust in the cooling air flowing through the casing 56. Thereby, dust and dust in the cooling air that passes through the suction connection passage 48 and is introduced into the compression chamber 18 can be removed. Depending on the intended use of the compressed air compressed by the air-cooled scroll compressor 1, it is often required that the compressed air does not contain foreign matters such as dust and dirt. However, since the cooling air flowing through the suction connection passage 48 is outside air introduced from the introduction port 38, there is a possibility that dust, dust, and the like are mixed. Therefore, by providing the dust removing device 52 in the suction connection passage 48 through which the cooling air introduced into the compression chamber 18 flows, the cooling air from which dust and dust have been removed can be introduced into the compression chamber 18. It is possible to prevent foreign matters such as dust and dirt from entering the compressed air compressed by the air-cooled scroll compressor 1. Furthermore, it is possible to maintain the sealing effect of the lap of the fixed scroll 10 and the orbiting scroll 14 and the tip seal provided at the tip of the wrap for a longer period of time, and the energy saving effect due to the increase in the amount of air per unit power is more stable. Can be maintained over a long period of time.

FIG. 3 is a cross-sectional view of the air-cooled scroll compressor according to the third embodiment.
The air-cooled scroll compressor in the third embodiment has the same configuration as the scroll compressor in the first embodiment shown in FIG. 1 except that the suction connection passage 48 is not provided and a branch passage 40 described later is provided. Is the action. Therefore, description is abbreviate | omitted regarding the same structure and operation | movement as the air-cooling type scroll compressor in Example 1 shown in FIG. 1, and the same code | symbol shall represent the same thing.

In the air-cooled scroll compressor according to the third embodiment shown in FIG. 3, a branch passage 40 that branches from the cooling duct 32 of the compressor body cooling duct 28 is provided. In the branch passage 40, a part of the cooling air flowing in the cooling duct 32 forming the compressor main body cooling duct 28 branches into the branch passage 40, and the cooling air flowing through the branch passage 40 flows. It is introduced into the compression chamber 18 from the outer peripheral side.
The branching amount of the cooling air from the cooling duct 32 to the branch passage 40 is set in advance so that a desired amount of cooling air branches, or the opening degree of the branch passage 40 is adjusted. Adjustment is possible by adjusting the damper opening by providing a possible damper, or by changing the passage sectional area by providing means capable of changing the passage sectional area of the branch passage 40.

  As described above, the cooling air is introduced into the compression chamber 18 as the compression fluid through the branch passage 40 branched from the cooling duct 32. Since the cooling air is in a positive pressure state in which the pressure is higher than the atmospheric pressure due to the action of the centrifugal fan 36, the cooling air is introduced into the compression chamber 18 as a compression fluid, so that the compression in the compression chamber 18 is performed. The ratio can be kept small, and the compression efficiency becomes high. Therefore, the amount of air compressed and discharged by the air-cooled scroll compressor 1 can be increased, and an energy saving effect can be obtained by increasing the amount of air per unit power. Furthermore, the discharge temperature of compressed air can be reduced by keeping the compression ratio small.

FIG. 4 is a cross-sectional view of the scroll compressor according to the fourth embodiment.
The scroll compressor in the fourth embodiment has the same configuration and operation as the air-cooled scroll compressor in the third embodiment shown in FIG. 3 except that the dust removing device 42 is provided in the branch passage 40. Therefore, description is abbreviate | omitted regarding the same structure and operation | movement as the scroll compressor in Example 3 shown in FIG. 3, and the same code | symbol shall represent the same thing.

In the air-cooled scroll compressor 1 according to the fourth embodiment illustrated in FIG. 4, the dust removing device 42 is provided in the branch passage 40 . The dust removing device 42 includes a casing 46 and a filter 44 that is housed in the casing 46 and removes dust and dirt in the cooling air flowing through the casing 46. Thereby, dust and dust in the cooling air that passes through the branch passage 40 and is introduced into the compression chamber 18 can be removed. Depending on the intended use of the compressed air compressed by the air-cooled scroll compressor 1, it is often required that the compressed air does not contain foreign matters such as dust and dirt. However, since the cooling air branched from the cooling duct 32 and flowing through the branch passage 40 is outside air introduced from the introduction port 38, there is a possibility that dust, dust and the like are mixed. Therefore, by providing the dust removing device 42 in the branch passage 40 through which the cooling air to be introduced into the compression chamber 18 flows, the cooling air from which dust and dust have been removed can be introduced into the compression chamber 18, thereby air-cooling type. It is possible to prevent foreign matters such as dust and dirt from entering the compressed air compressed by the scroll compressor 1. Furthermore, it is possible to maintain the sealing effect of the lap of the fixed scroll 10 and the orbiting scroll 14 and the tip seal provided at the tip of the wrap for a longer period of time, and the energy saving effect due to the increase in the amount of air per unit power is more stable. Can be maintained over a long period of time.

FIG. 5 is a cross-sectional view of the air-cooled scroll compressor according to the fifth embodiment.
The air-cooled scroll compressor according to the fifth embodiment has the same configuration and operation as the air-cooled scroll compressor according to the second embodiment shown in FIG. Therefore, description is abbreviate | omitted regarding the same structure and operation | movement as the air-cooling type scroll compressor in Example 2 shown in FIG. 2, and the same code | symbol shall represent the same thing.

In FIG. 5, the drive shaft 22 is connected to a motor 25 and is configured to rotate by driving the motor 25.
In this way, the drive shaft 22 can be directly connected to the motor 25.

FIG. 6 is a cross-sectional view of the air-cooled scroll compressor according to the sixth embodiment.
The air-cooled scroll compressor in the sixth embodiment has the same configuration and operation as the air-cooled scroll compressor in the fifth embodiment shown in FIG. 5 except that a merging passage 60 described later is provided. Therefore, description is abbreviate | omitted regarding the same structure and operation | movement as the air-cooling type scroll compressor in Example 5 shown in FIG. 5, and the same code | symbol shall represent the same thing.

In FIG. 6, a merging passage 60 for merging the air discharged from the fan 62 of the motor 25 into the branch passage 40 is provided. Thereby, the air discharged from the fan 62 of the motor 25 can be introduced into the compression chamber 18 together with the cooling air flowing through the branch passage 40, and the air discharged from the fan 62 of the motor 25 can be effectively utilized. it can. Furthermore, since the air discharged from the fan 62 of the motor 25 is merged with the cooling air flowing through the branch passage 40, the amount of cooling air branched from the cooling duct 32 to the branch passage 40 can be reduced, and the cooling The cooling air introduced for cooling from the duct 32 into the casing 2 can be sufficiently secured.
In addition, since the air from the fan 62 of the motor 25 is in a positive pressure state where the pressure is higher than the atmospheric pressure, there is no particular problem when the air is combined with the cooling air flowing through the branch passage 40.

  It is possible to cool the orbiting scroll and the fixed scroll without increasing the size of the compressor cooling device, increase the amount of air discharged, increase the amount of air per unit power, and improve the compression ratio. It can be used as an air-cooled scroll compressor capable of lowering the discharge temperature due to.

2 Compressor casing 10 Fixed scroll 11 End plate 12 Fixed wrap 14 Orbiting scroll 15 End plate 16 Orbiting wrap 18 Compression chamber 22 Drive shaft 25 Motor
30 Cooling fan casing 32 Cooling duct (duct)
36 Centrifugal fan (cooling fan)
40 branch passage 42, 52 dust removing device (dust removing means)
48 Suction connection passage 60 Merge passage 62 Fan

Claims (8)

A revolving scroll with a revolving wrap standing on an end plate housed in a compressor casing and supported by a drive shaft so as to be revolving, and a fixed with a fixed lap standing on the end plate provided opposite to the revolving scroll Scroll and
A compression chamber for compressing fluid is formed by superimposing the swirl wrap and the fixed wrap, and cooling air discharged from a cooling fan attached to the drive shaft is passed through a compressor casing containing the compression chamber. A duct for cooling the compressor body is introduced to guide and introduce
Cooling the compression heat generated in the compression chamber by supplying the cooling air to at least one of the rear side of the orbiting scroll and the front side of the fixed scroll housed in the compressor casing ;
A suction communication passage is provided for passing a part of the positive pressure air flow generated by the cooling fan, and a part of the air flow discharged from the cooling fan is passed through the suction communication passage in the compression chamber. An air-cooled scroll compressor characterized in that it can be introduced from the outer peripheral side. The suction communication passage is a suction connection passage through which cooling air discharged from the cooling fan flows separately from the compressor body cooling duct,
The suction connection passage is provided apart from the compressor body cooling duct, and a part of the cooling air discharged from the cooling fan can be introduced from the outer peripheral side into the compression chamber through the suction connection passage. The air-cooled scroll compressor according to claim 1.   3. The air-cooled scroll compressor according to claim 2, wherein the suction connection passage is provided with dust removing means for removing dust and dust in the cooling air flowing through the suction connection passage.   4. The air-cooled scroll compressor according to claim 2, wherein the suction connection passage can be removed and replaced.   The air-cooled scroll compressor according to claim 2 or 3, wherein the suction connection passage is provided with changing means capable of changing the cross-sectional area of the passage. The suction communication passage is a branch passage which is branched to the compressor body cooling duct, a part of the cooling air discharged from the cooling fan was set to be introduced from the outer peripheral side to the compression chamber through the branch passage The air-cooled scroll compressor according to claim 1.   7. The air-cooled scroll compressor according to claim 6, wherein the branch passage is provided with dust removing means for removing dust and dust in the cooling air flowing through the branch passage.   8. An air-cooled scroll compressor according to claim 6, further comprising a passage for guiding and introducing air discharged from a fan of a motor for rotating the drive shaft into the branch passage. .

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