Provided is a package-type compressor that can improve cooling performance for cooling a body unit and a control panel. The package-type compressor includes: a cooling fan accommodated in a fan duct to induce a flow of cooling air taken in through inlets and discharged through an outlet; a machine chamber that causes the cooling air taken in at the inlet to flow along a body unit; and a cooling duct that causes the cooling air taken in at the inlet to flow along the control panel. A center position of the suction port of the fan duct is offset away from the inlet and toward the inlet with respect to a center position of a drive shaft of a motor of the body unit.

TECHNICAL FIELD

The present invention relates to a package-type compressor.

BACKGROUND ART

Patent Document 1 discloses a package-type compressor having a casing accommodating a body unit, an oil separator, a controller, a heat exchanger, a cooling fan device, etc. The compressor will be described in detail.

The body unit has a compressor body compressing air and a motor driving this compressor body, with the compressor body and the motor being integrated. More specifically, the compressor body and the motor are vertically installed such that the rotation shaft of the compressor body and the drive shaft of the motor extend in the vertical direction, with the motor being connected to the upper side of the compressor body.

At the lower portion of the right-hand side surface of the casing, there is formed an air suction port, and there are provided a first duct adjacent to a portion of the air suction port and a second duct adjacent to another portion of the air suction port. At the left-hand side surface side of the casing, there is provided a third duct extending in the vertical direction. The heat exchanger is provided at the lower portion of the third duct, and the cooling fan device is provided at the upper portion of the third duct. An air discharge port is formed in the upper surface of the casing.

The cooling fan device is equipped with a case having a suction port and a delivery port, a cooling fan (centrifugal fan) accommodated in the case, and a fan motor driving the cooling fan. The cooling fan and the fan motor are arranged such that their rotation shafts extend in the horizontal direction. The suction port of the case is connected to the third duct, and the delivery port of the case is connected to the air discharge port. The cooling fan device induces a flow of the cooling air inside the casing (more specifically, a flow of the cooling air sucked in through the air suction port and discharged through the air discharge port).

The first duct guides the cooling air from the air suction port to the motor of the body unit to cool the motor. The second duct causes the cooling air from the air suction port to flow along the controller to cool the controller. The cooling air having cooled the motor and the controller cools the heat exchanger. After this, the cooling air heads for the cooling fan device via the third duct.

PRIOR ART DOCUMENT

Patent Document

SUMMARY OF THE INVENTION

Problem to be Solved by the Invention

In the prior-art technique disclosed in Patent Document 1, the compressor body and the motor of the body unit are vertically installed, with the compressor body and the motor being connected together in the vertical direction so as to be integrated with each other. As a result, it is possible to achieve a reduction in the installation area of the body unit and, by extension, a reduction in the installation area of the package-type compressor. Further, although not described in Patent Document 1, when the cooling air is caused to flow in the vertical direction along the body unit, it is possible to efficiently cool the body unit.

In the prior-art technique described in Patent Document 1, however, the air suction port is formed solely in one side surface of the casing, and there are limitations to the size of the air suction port due to a restriction such as sound insulation. Further, the flow path of the cooling air, which extends from the air suction port via the first or second duct and further extends to the air discharge port via the third duct, is relatively long, and the pressure loss of the cooling air flow path is relatively large. Thus, it is difficult to increase the flow rate of the cooling air cooling the body unit and the flow rate of the cooling air cooling the controller. Further, it is difficult to balance the flow rate of the cooling air in the first duct and that in the second duct, and it is difficult to increase the flow rate of the cooling air of the second duct (i.e., the flow rate of the cooling air cooling the controller). Thus, there is room for an improvement in terms of the cooling performance for cooling the body unit and the controller.

The present invention has been made in view of the above problem. It is an object of the present invention to achieve an improvement in terms of the cooling performance for cooling the body unit and the controller.

Means for Solving the Problem

To achieve the above object, the structure as claimed in the appending claims is applied. The present invention includes a plurality of means for solving the above problem, an example of which is a package-type compressor including: a body unit which has a compressor body compressing a gas and a motor driving the compressor body and in which the compressor body and the motor are vertically connected to be integrated while vertically installing the compressor body and the motor such that a rotation shaft of the compressor body and a drive shaft of the motor extend vertically; a controller controlling the motor; a casing accommodating the body unit and the controller at a lower portion thereof; a first cooling air inlet formed in one side surface of the casing; a second cooling air inlet formed in another side surface of the casing; a cooling air outlet formed in an upper surface of the casing; a fan duct provided at an upper portion of the casing and having a suction port at a lower surface and a delivery port at an upper surface; a cooling fan accommodated in the fan duct and arranged such that a rotation shaft extends in a vertical direction, the cooling fan inducing a flow of cooling air taken in through the first and second cooling air inlets and discharged through the cooling air outlet; an air cooling type heat exchanger arranged above the delivery port of the fan duct and below the cooling air outlet; a machine chamber that is provided below the fan duct and accommodates the body unit and that causes the cooling air taken in at the first cooling air inlet to flow along the body unit and to head for the suction port of the fan duct; and a cooling duct that is provided below the fan duct and that causes the cooling air taken in at the second cooling air inlet to flow along the controller and to head for the suction port of the fan duct, wherein a center position of the suction port of the fan duct is offset away from the first cooling air inlet and toward the second cooling air inlet with respect to a center position of the drive shaft of the motor.

Effect of the Invention

In accordance with the present invention, it is possible to achieve an improvement in terms of the cooling performance for cooling the body unit and the controller.

Other objects, structure, and effects of the present invention will become apparent from the following description.

MODES FOR CARRYING OUT THE INVENTION

A package-type compressor according to the present embodiment is equipped with a casing1accommodating apparatuses and components described below. The casing1is equipped with a base2, a front panel3, a left-hand side panel4, a right-hand side panel5, a back panel6, and a top panel7. The front panel3is provided with an operation switch (not shown), a monitor, etc. The left-hand side panel4has a cooling air inlet8A (first cooling air inlet/inlet port) at the lower side thereof, and has a cooling air inlet8C (third cooling air inlet/inlet port) at the upper side of the cooling air inlet8A. The right-hand side panel5has a cooling air inlet8B (second cooling air inlet/inlet port) at the lower side thereof. The top panel7has a cooling air outlet9. Each panel is detachable to allow maintenance of the apparatuses accommodated in the casing1. In the present embodiment, the opening area of the cooling air inlet8B is smaller than the opening area of the cooling air inlet8A.

The casing1has a machine chamber10at its lower portion, and the machine chamber10accommodates a body unit11and a suction filter12. The suction filter12is arranged on the front side of the machine chamber10(the right-hand side inFIG. 4, and the lower side inFIG. 14).

The body unit11has an oil feeding type compressor body13, a motor14driving the compressor body13, and an oil separator15(gas-liquid separator) separating oil from the compressed air (compressed gas) delivered from the compressor body13, and the compressor body13, the motor14, and the oil separator15are integrated with each other. More specifically, the compressor body13and the motor14are vertically installed such that the rotation shaft of the compressor body13and the drive shaft (rotation shaft) of the motor14, described below, extend in the vertical direction. In the body unit11, the motor14is arranged on the upper side of the compressor body13, and the oil separator15is arranged on the lower side of the compressor body13.

The motor14is an axial gap type motor. This motor14has a drive shaft16extending in the vertical direction, motor rotors17A and17B mounted to the drive shaft16so as to be spaced away from each other in the axial direction, a stator18arranged between the motor rotors17A and17B, and a motor casing19to which the stator18is mounted.

The compressor body13is a screw compressor. This compressor body13is equipped with: a male rotor20A and a female rotor20B in mesh with each other; a compressor body casing21accommodating the tooth portions of the screw rotors20A and20B and forming a compression chamber in their tooth grooves; and a suction side casing22connected between the compressor body casing21and the motor casing19. The suction side casing22has a suction port23, and the compressor body casing21has a suction flow path (not shown). The compressor body casing21has a delivery port and a delivery flow path (not shown). A suction filter12is connected to the suction route of the compressor body casing21via piping (not shown).

The rotation shafts of the male rotor20A and the female rotor20B extend in the vertical direction, and the male rotor20A is integrally formed with or connected to the drive shaft16of the motor14. When the drive shaft16of the motor14rotates, the male rotor20A and the female rotor20B rotate, and the compression chamber moves downwards. The compression chamber sucks in air from the suction flow path via the suction port23, compress the air, and deliver the compressed air into the delivery flow path via the delivery port.

The oil separator15is equipped with an outer cylinder24and an inner cylinder25that are integrally formed with or connected to the compressor body casing21, and an oil storage portion26provided on the lower side of the outer cylinder24. The inner cylinder25is arranged at or near the center of the upper portion of the outer cylinder24, and a swirl flow path is formed between the outer cylinder24and the inner cylinder25. This swirl flow path is connected to the delivery flow path of the compressor body13. The compressed air delivered from the compressor body13swirls along the swirl flow path, and the oil contained in the compressed air is centrifugally separated. The separated oil falls along the outer cylinder24, and is accumulated in the oil storage portion26. The oil accumulated in the oil storage portion26is supplied into the suction flow path or the compression chamber of the compressor body13via an oil cooler described below.

On the other hand, the separated compressed air flows into the inner side of the inner cylinder25, and is supplied to an air cooler described below via a flow path and piping, which are not shown. After this, the compressed air is supplied to a dryer described below.

The casing1has a fan duct27in the upper portion thereof (in other words, above the machine chamber10). The fan duct27is formed by a lower plate, a front plate, a left-hand side plate, a right-hand side plate, a back plate, and an upper plate. The lower plate of the fan duct27(in other words, the partition plate defining the machine chamber10) has a suction port28(seeFIGS. 12 and 14), and the upper plate of the fan duct27(in other words, the support plate supporting the heat exchanger described below) has a delivery port29(seeFIG. 1).

The fan duct27accommodates a turbo fan30(cooling fan) and a fan motor31driving the turbo fan30. The turbo fan30and the fan motor31are arranged such that their rotation shafts extend in the vertical direction. The turbo fan30is a kind of centrifugal fan, and is formed by an upper shroud, a lower shroud, and a plurality of vanes provided between them. As indicated by arrows A, B, and C ofFIG. 13, the turbo fan30induces a cooling air flow which is taken in through the cooling air inlets8A and8B and discharged through the cooling air outlet9. In other words, it takes in external air and generates cooling air flowing through the casing1.

Above the delivery port29of the fan duct27and below the cooling air outlet9, there is arranged an air cooling type heat exchanger32. The heat exchanger32has an oil cooler and an air cooler as mentioned above. The heat exchanger32is, for example, made of aluminum or formed by a copper pipe and an aluminum plate. The cooling air delivered through the delivery port29of the fan duct27cools the heat exchanger32, and is then discharged through the cooling air outlet9(see arrows C inFIG. 13).

On the left-hand side (the left-hand side inFIG. 2) of the machine chamber10, there is arranged an introduction duct33. As shown inFIG. 4, the introduction duct33is of substantially the same sectional configuration as the cooling air inlet8A, and extends in the horizontal direction between the cooling air inlet8A and the machine chamber10as shown inFIG. 2. The cooling air taken in at the cooling air inlet8A flows into the lower portion of the machine chamber10via the introduction duct33, and flows along the body unit11in the machine chamber10before heading for the suction port28of the fan duct (see arrows A inFIGS. 13 and 14). As a result, the body unit11is efficiently cooled. The introduction duct33also serves to support a dryer, a dryer cooling fan, etc. mentioned below.

On the right-hand side (the right-hand side inFIG. 2) of the machine chamber10, there are arranged a control panel (controller) controlling the motor14, etc. and a cooling duct35adjacent to the control panel34(in other words, covering the control panel34). The control panel34has an inverter36performing variable control on the rotation speed of the motor14, and a capacitor (electric storage device)37. A heat sink38of the inverter36and a part of the capacitor37protrude into the cooling duct35. While in the present embodiment there are provided two sets of inverters36and capacitors37, it is also possible to provide one set or three or more sets of them.

As shown inFIG. 10, the cooling duct35is composed of a portion adjacent to the lower side of the control panel34and extending in the horizontal direction from the cooling air inlet8B, and a portion adjacent to the left-hand side of the control panel34and extending in the vertical direction toward the suction side of the turbo fan30. As shown inFIG. 6, an inlet39of the cooling duct35is large enough to correspond to the major portion of the cooling air inlet8B. As shown inFIG. 2, the outlet of the cooling duct35is situated at a height corresponding to the motor14of the body unit11, and has a size corresponding to the projection plane in the horizontal direction of the motor14. The cooling air taken in at the major portion of the cooling air inlet8B flows (is guided) through the cooling duct35(in other words, flows along the control panel34) to cool the control panel34(see arrows B inFIGS. 10, 13, and 14).

In the upper portion of the machine chamber10, the cooling air having flowed through the cooling duct35joins the cooling air from the introduction duct33, and heads for the suction port28of the fan duct27. Here, a feature of the present embodiment is that, as shown inFIG. 14, the center position O1of the suction port28of the fan duct27is offset away from the cooling air inlet8A and toward the cooling air inlet8B with respect to the center position O2of the drive shaft16of the motor14(in other words, the center position of the rotation shaft of the male rotor20A of the compressor body13). The offset width is, for example, approximately the radius of the motor14.

The rotation shaft of the turbo fan30is arranged concentrically with the suction port28of the fan duct27. As shown inFIG. 14, when the turbo fan30is projected in the vertical direction, the turbo fan30partially overlaps the motor14and, at the same time, the turbo fan30partially overlaps the cooling duct35. Further, as shown inFIG. 12, the turbo fan30is arranged so as to be closer to the right-hand side plate of the fan duct27than to the left-hand side plate on the opposite side thereof, and as to be closer to the back plate of the fan duct27(in other words, the side plate adjacent to the right-hand side plate of the fan duct27in the rotational direction of the turbo fan30) than to the front plate on the opposite side thereof. The left-hand side plate of the fan duct27has an inclined surface40inclined with respect to the vertical direction. As a result, the swirl flow in the fan duct27is mitigated, and an upward flow heading for the heat exchanger32is generated.

On the front side of the cooling duct35, there is arranged a suction duct41so as to be adjacent thereto, and this suction duct41is connected to the suction side of the compressor body13via the suction filter12. As shown inFIG. 6, an inlet42of the suction duct41is of a size large enough to correspond to the minor portion of the cooling air inlet8B. Air is sucked into the compressor body13from the minor portion of the cooling air inlet8B via the suction duct41and the suction filter12(see arrows D inFIGS. 11 and 14).

On the left-hand side of the machine chamber10and the fan duct27and on the upper side of the introduction duct33, there is formed a dryer chamber43, and this dryer chamber43is cut off from the machine chamber10. The dryer chamber43accommodates a dryer44drying the compressed air, which is generated by the body unit11and cooled by the air cooler, through heat exchange with the cooling air (in other words, a heat exchanger removing drain from the compressed air). Further, the dryer chamber43accommodates a dryer cooling fan45(propeller fan) and a dryer fan motor driving this cooling fan45. The dryer cooling fan45is arranged opposite the cooling air inlet8C, and, as indicated by an arrow E ofFIG. 13, induces a cooling air flow in the dryer chamber43(a cooling air flow taken in through the cooling air inlet8C and discharged through the cooling air outlet9). As a result, the dryer44is cooled. That is, the dryer chamber43functions as a duct for the dryer44.

Next, the effects of the present embodiment will be described.

In the present embodiment, the cooling air inlets8A and8B are respectively formed in the left-hand side panel4and the right-hand side panel5of the casing1, so that, as compared with the case where the cooling air inlet is formed solely in one side surface of the casing1, it is possible to increase the total area of the cooling air inlets8A and8B. Further, the cooling air flow path extending from the cooling air inlet8A to the cooling air outlet9via the introduction duct33, the machine chamber10, and the fan duct27, and the cooling air flow path extending from the cooling air inlet8B to the cooling air outlet9via the cooling duct35, the upper portion of the machine chamber10, and the fan duct27are relatively short, and the pressure loss of the cooling air flow path is relatively small. Thus, it is possible to increase the flow rate of the cooling air cooling the body unit11and the flow rate of the cooling air cooling the control panel34. Thus, it is possible to achieve an improvement in terms of the cooling performance for cooling the body unit11and the control panel34. Further, it is also possible to improve the cooling performance for cooling the heat exchanger32.

Further, the center position O1of the suction port28of the fan duct27is offset with respect to the center position O2of the drive shaft16of the motor14, whereby it is possible to attain a balanced state in terms of the flow rate of the cooling air at the cooling air inlet8A and the cooling air inlet8B. In particular, the former center position is offset with respect to the latter center position so as to be away from the cooling air inlet8A and toward the cooling air inlet8B, whereby it is possible to increase the flow rate of the cooling air cooling the control panel34to improve the cooling performance for cooling the control panel34without impairing the cooling performance for cooling the body unit11. Generally speaking, a control panel includes a lot of components vulnerable to heat, so that a dedicated cooling fan for the control panel is often installed.

According to the present embodiment, it is possible to secure a sufficient cooling air amount for the control panel34, making it possible to advantageously eliminate the installation cost of such a dedicated fan. That is, there is no need to provide a dedicated fan or the output power of the dedicated fan is reduced, whereby it is possible to achieve a reduction in cost.

Further, the center position O1of the suction port28of the fan duct27is offset with respect to the center position O2of the drive shaft16of the motor14, whereby it is possible to diminish the distance in the height direction between the suction port28of the fan duct27and the motor14. This helps to achieve a reduction in the size of the package-type compressor.

Further, in the present embodiment, the dryer chamber43is provided between the compressor body13and the left-hand side panel4, and the control panel34and the cooling duct35are provided between the compressor body13and the right-hand side panel5, whereby it is possible to enhance the sound insulation effect.

Although not described in particular in connection with the above embodiment, as in the case of a first modification shown inFIGS. 15 through 17, a guide46may be provided so as to be astride the introduction duct33and the machine chamber10. As shown inFIG. 16, the guide46has substantially the same width dimension as the width dimension of the body unit11. Further, as shown inFIG. 15, the guide46has a horizontal plate extending from the introduction duct33toward the lower portion (more specifically, the oil separator15) of the body unit11, and an inclined plate and a vertical plate extending from the lower portion to the middle portion (more specifically the compressor body13) of the body unit11.

As shown inFIG. 17, the guide46effects division into a flow supplying cooling air from the cooling air inlet8A toward the lower portion of the body unit11(see an arrow A1), and a flow supplying cooling air from the cooling air inlet8A toward the upper portion (more specifically, the motor14) of the body unit11(see an arrow A2). As a result, it is possible to supply cooling air at lower temperature to the upper portion of the body unit11, making it possible to enhance the cooling performance for the upper portion of the body unit11. Further, the guide46interrupts the noise of the compressor body13, so that it is possible to suppress sound leakage from the cooling air inlet8A.

While in the embodiment described above the turbo fan30(centrifugal fan) is provided as the cooling fan in the fan duct27, this should not be construed restrictively. The embodiment allows modification without departing from the scope of the gist and technical idea of the present invention. As in the case of a second modification shown inFIG. 18, there may be provided a propeller fan47(an axial flow fan) the rotation shaft of which extends in the vertical direction. This helps to diminish the height dimension of the fan duct27and, by extension, the height dimension of the package-type compressor.

Further, while in the embodiment described above there is provided one suction system connected to the suction side of the compressor body13(more specifically, the suction duct41and the suction filter12), this should not be construed restrictively. The embodiment allows modification without departing from the scope of the gist and technical idea of the present invention. As in the case of a third modification shown inFIG. 19, it is also possible to provide one side suction system (more specifically, the suction duct41and the suction filter12) and the other side suction system (more specifically, a suction duct41A and a suction filter12A), which are separately connected to the suction side of the compression body13. That is, the suction duct41A may be provided so as to be adjacent to front side of the introduction duct33, and the suction duct41A may be connected to the suction side of the compressor body13via the suction filter12A. In the present modification, the suction filter is divided and diminished in size, whereby it is possible to enhance the degree of freedom in terms of the apparatus layout in the machine chamber10and to achieve a reduction in the size of the package-type compressor.

Further, while in the embodiment described above the cooling air inlet8A is formed in the left-hand side surface of the casing1and the cooling air inlet8B is formed in the right-hand side surface on the opposite side of the left-hand side surface of the casing1, this should not be construed restrictively. The embodiment allows modification without departing from the scope of the gist and technical idea of the present invention. As in the case of a fourth modification shown inFIG. 20, the cooling air inlet8A may be formed in the left-hand side surface of the casing1, and the cooling air inlet8B may be formed in the back surface adjacent to the left-hand side surface of the casing1. That is, the control panel34and the cooling duct35may be arranged on the back side of the machine chamber10. Further, the suction filter12and the suction duct41may be arranged on the back side of the machine chamber10. Also in these modifications, the center position O1of the suction port28of the fan duct27is offset so as to be away from the cooling air inlet8A and toward the cooling air inlet8B with respect to the center position O2of the drive shaft16of the motor14, whereby it is possible to attain the same effect as that of the above embodiment.

Further, while in the embodiment described above the body unit11has the oil feeding type compressor body13supplying oil into the suction flow path or the compression chamber, and the oil separator15separating oil from the compressed air delivered from the compressor body13, with the motor14being integrated with the compressor body13and the oil separator15, this should not be construed restrictively. The embodiment allows modification without departing from the scope of the gist and technical idea of the present invention. For example, there may be provided a water feeding type compressor body supplying water into the suction flow path or the compression chamber, and a water separator (a gas-liquid separator) separating water from the compressed air delivered from the compressor body, with the motor being integrated with the compressor body and the water separator. Further, for example, there may be provided a compressor body not supplying oil or water into the suction flow path or the compression chamber, with the motor being integrated with this compressor body (that is, the gas-liquid separator may not be provided). Also in these cases, it is possible to attain the same effect as that of the above embodiment.

Further, while in the embodiment described above the compressor body13has the two screw rotors20A and20B, this should not be construed restrictively. That is, it may also have a single screw rotor or a tri-rotor. Further, the rotor is not restricted to a screw type one. For example, it may also be a scroll type, a vane type or the like. Further, while in the embodiment described above the compressor body13compresses air, this should not be construed restrictively. It may compress some other gas than air.

Further, while in the embodiment described above the motor14is an axial gap type motor (more specifically, a motor equipped with motor rotors17A and17B spaced away from each other in the axial direction of the drive shaft16and a stator18), this should not be construed restrictively. For example, it may also be a radial gap type motor (more specifically, a motor equipped with a motor rotor and a stator that are spaced away from each other in the radial direction of the drive shaft).

Further, while in the embodiment described above there are provided the dryer44and the dryer cooling fan45and the cooling air inlet8C is formed in the left-hand side panel4, this should not be construed restrictively. That is, the dryer44and the dryer cooling fan45may not be provided, and the cooling air inlet8C may not be formed in the left-hand side panel4.

DESCRIPTION OF REFERENCE CHARACTERS