JP7190390B2 - Package type oil-cooled screw compressor - Google Patents

Description

The present invention relates to a package-type oil-cooled screw compressor.

Patent Literature 1 discloses the structure of a package-type oil-cooled screw compressor provided with a gas cooler. In order to send cooled air to the gas cooler, it is preferable to have a structure that avoids a heat source without generating pressure loss in the air flow path from the suction port of the package to the cooling fan. Further, in order to improve the efficiency of the compressor body, it is preferable to have a structure that avoids a heat source without causing pressure loss in the air flow path from the suction port of the package to the suction port of the compressor body. Further, in order to reduce noise, it is preferable to design so that the noise from the main noise sources, the oil recovery device of the compressor body and the cooling fan, is less likely to propagate to the suction port of the package.

JP 2017-15031 A

However, in the compressor of Patent Document 1, since the suction port of the package is provided near the discharge port of the compressor body and the oil recovery device, the noise of the compressor body and the oil recovery device easily leaks out of the package. . In addition, due to this arrangement, the air drawn from the suction port of the package and drawn into the compressor body easily passes through the discharge port of the compressor body and a heat source such as piping extending from the discharge port. As a result, the temperature of the air taken into the compressor body rises, and the compression efficiency of the compressor body may deteriorate. Similarly, the temperature of the air blown by the gas cooler rises, and the cooling performance of the gas cooler may also deteriorate.

SUMMARY OF THE INVENTION An object of the present invention is to reduce the noise of a package-type oil-cooled screw compressor in a compact shape without deteriorating the compression efficiency of the compressor body and the cooling performance of the gas cooler.

A first aspect of the present invention is a box-shaped package provided with an opening on a side surface, a tubular shape with openings at both ends , one end attached to the side surface so as to surround the opening, and the other It comprises an intake duct whose end terminates inside the package, an oil-cooled compressor body having an intake port and a discharge port, and an oil recovery device for separating and recovering oil from the fluid discharged by the compressor body. , inside the package and outside the air intake duct, between the one end and the other end of the air intake duct in the direction in which the air intake duct extends , and on the side of the air intake duct excluding the one end and the other end A package-type oil-cooled screw compressor is provided in which the discharge port and the oil recovery device are arranged in a space formed on the side .

According to this configuration, inside the package and outside the air intake duct, the outlet and An oil collector is placed. Since this suitable installation space is located on the side of the air intake duct, in order for the sound waves generated in the suitable installation space to go out of the package, they must go around from the side of the air intake duct to the other end, pass through the air intake duct, It must reach one end of the air intake duct and exit through an opening in the package. Comparing the case where the sound wave goes around the air intake duct and goes out of the package and the case where the sound wave goes out of the package directly through the opening of the package, the former can weaken the sound wave and is more quiet. In the above configuration, since the discharge port and the oil recovery device are parts that generate noise, noise can be reduced by arranging them in a suitable installation space.

The air inlet may be arranged in the space .

According to this configuration, since the intake port is a portion that emits noise, the noise can be reduced in the same manner as described above by arranging the intake port in a suitable installation space.

A second aspect of the present invention includes a box-shaped package having an opening on a side surface, and a cylindrical package having one end attached to the side surface so as to surround the opening and the other end inside the package. , an oil-cooled compressor body having an intake port and a discharge port, and an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body. Inside and outside the air intake duct, the discharge port and the oil collector are arranged between the one end and the other end of the air intake duct in the direction in which the air intake duct extends, forming a lower portion of the air intake duct. A package-type oil-cooled screw compressor further includes a plate material that holds the air, and a notch portion provided in the plate member, and the intake port is arranged below the notch portion.

According to this configuration, in addition to the noise reduction, the air in the air intake duct can be guided toward the air intake port through the notch, so that the air intake efficiency can be improved.

Inside the package and outside the air intake duct, a discharge pipe fluidly connecting the discharge port and the oil recovery device between the one end and the other end of the air intake duct in the direction in which the air intake duct extends. may be placed.

According to this configuration, the discharge pipe is arranged in the suitable installation space. Since the preferred installation space is located on the side of the intake duct, the air taken in through the intake duct is less likely to be thermally affected by the preferred installation space. In other words, when comparing the case where the heat source component is arranged in the suitable installation space and the case where the heat source component is arranged at the position facing the other end of the air intake duct, the latter is more influenced by the heat source. As a result, the temperature of the air taken in through the intake duct rises. In the above configuration, the discharge pipe serves as a heat source because it is a pipe through which high-temperature air with heat of compression passes. Therefore, by arranging the discharge pipe in a suitable installation space, it is possible to suppress an increase in the temperature of the air taken in through the intake duct. Therefore, the temperature rise of the air taken into the intake port of the compressor main body is suppressed, and the compression efficiency of the compressor main body can be suppressed from decreasing. Moreover, when the package-type oil-cooled screw compressor is provided with a gas cooler and an air-cooling fan, which will be described later, a decrease in cooling efficiency of the gas cooler and the air-cooling fan can be similarly suppressed.

A third aspect of the present invention is a box-shaped package having an opening on a side surface, and a cylindrical package having one end attached to the side surface so as to surround the opening and the other end inside the package. , an oil-cooled compressor body having an intake port and a discharge port, and an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body. Inside and outside the air intake duct, the discharge port and the oil recovery device are arranged between the one end and the other end of the air intake duct in the direction in which the air intake duct extends, and the other end of the air intake duct is arranged. A partition panel having an upper end attached to the ceiling wall of the package and a lower end extending to a position lower than the other end of the air intake duct, and the oil is separated by the oil collector. a transfer pipe for transferring a fluid, a gas cooler interposed in the transfer pipe within the package to cool the fluid flowing through the transfer pipe, and an air-cooling fan disposed in the package for blowing air toward the gas cooler. and wherein the partition panel is arranged between the gas cooler and the air cooling fan and the intake duct in the direction in which the intake duct extends.

According to this configuration, in addition to the noise reduction described above, the gas cooler and the air cooling fan can cool the air that is transferred to the supply destination outside the package through the transfer pipe. The air flowing through the transfer pipe is compressed to a high pressure in the main body of the compressor, and the temperature rises due to the heat of compression. It can be supplied to the destination. In addition, the gas cooler and air-cooling fan can be noise sources, but since a partition panel is placed between them and the air intake duct, the noise from the gas cooler and air-cooling fan does not directly leak out of the package through the air intake duct. can be prevented and noise can be reduced.

The lower end of the partition panel may be positioned lower than a straight line connecting the upper end of the opening and the lower end of the other end of the intake duct.

According to this configuration, since the upper end of the partition panel is attached to the package, in order for the sound waves of noise from the gas cooler and the air cooling fan to leak out of the package through the intake duct, the sound waves must pass below the partition panel. There is a need. In particular, since the lower edge of the partition panel is located lower than the straight line connecting the upper edge of the opening of the package and the lower edge of the other end of the air intake duct, the sound waves must go around the partition panel in the vertical direction. . Therefore, the noise from the gas cooler and the air cooling fan does not directly leak out of the package, and the noise can be reduced.

A sound absorbing material may be attached to an inner surface of the air intake duct and a surface of the partition panel facing the air intake duct.

According to this configuration, the inner surface of the air intake duct and the surface of the partition panel facing the air intake duct serve as paths for sound waves of noise. Therefore, noise can be efficiently reduced by attaching a sound absorbing material to the sound wave path.

A fourth aspect of the present invention is a box-shaped package having an opening on a side surface, and a cylindrical package having one end attached to the side surface so as to surround the opening and the other end inside the package. , an oil-cooled compressor body having an intake port and a discharge port, and an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body. Inside and outside the air intake duct, the discharge port and the oil recovery device are arranged between the one end and the other end of the air intake duct in the direction in which the air intake duct extends, and the air intake duct is arranged at the one end. , the opening portion is formed by a plurality of holes, and the opening area of the air intake duct is larger than the total opening area of the plurality of holes. To provide a package-type oil-cooled screw compressor having a larger flow passage area at the other end.

According to this configuration, in addition to the noise reduction, the flow passage area of air (sound) leaking from the opening of the package through the air intake duct changes in the order of small, large, and small. Specifically, the other end of the air intake duct has the smallest flow passage area in the air intake duct, and the flow passage area increases from the other end to the one end in the air intake duct. Then, at the opening of the package, the flow area is reduced again by the plurality of holes. Due to this change in flow path area, an expansion space is formed in the intake duct, and the expansion space serves as a muffling chamber. Therefore, a silencing effect is obtained, and noise can be further reduced. In addition, since the passage area of the other end of the intake duct is larger than the sum of the opening areas of the multiple holes in the opening of the package, there is no large pressure loss in the intake air passage, resulting in efficient intake. can.

According to the present invention, in the package-type oil-cooled screw compressor, the discharge port and the oil recovery device, which are noise sources, are arranged in a suitable installation space, so that the compression efficiency of the compressor body and the gas cooler can be achieved with a compact shape. noise can be reduced without deteriorating cooling performance.

1 is a schematic cross-sectional view of a package-type oil-cooled screw compressor according to a first embodiment of the present invention; FIG. FIG. 2 is a schematic cross-sectional view of the package-type oil-cooled screw compressor taken along line II-II in FIG. 1; FIG. 2 is a schematic cross-sectional view of the package-type oil-cooled screw compressor taken along line III-III in FIG. 1; Schematic front view of the opening of the package. FIG. 5 is a schematic cross-sectional view of a package-type oil-cooled screw compressor according to a second embodiment; 6 is a schematic cross-sectional view of the package-type oil-cooled screw compressor taken along line II-II in FIG. 5; FIG. 6 is a schematic cross-sectional view of the package-type oil-cooled screw compressor taken along line III-III in FIG. 5; FIG. FIG. 6 is a schematic cross-sectional view of a modified example of the package-type oil-cooled screw compressor of FIG. 5 ;

Embodiments of the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
The configuration of a package-type oil-cooled screw compressor 1 according to the first embodiment will be described with reference to FIGS. 1 to 3. FIG. Hereinafter, the package-type oil-cooled screw compressor 1 will also be simply referred to as the compressor 1 . FIG. 1 is a cross-sectional view taken along line II of FIG. FIG. 2 is a cross-sectional view taken along line II--II of FIG. FIG. 3 is a cross-sectional view taken along line III--III in FIG.

The compressor 1 includes a box-shaped package 10 . The compressor 1 includes a compressor body 20 , an oil recovery device 30 , a gas cooler 40 and an air cooling fan 41 inside a package 10 .

The package 10 is made of a metal plate such as a steel plate. An opening 11 is provided in the upper part of the side surface of the package 10 . A rectangular tubular intake duct 12 extending into the package 10 is attached to the opening 11 . Specifically, one end 12 a of the intake duct 12 is attached to the side surface so as to surround the opening 11 , and the other end 12 b terminates inside the package 10 . In this embodiment, as shown in FIG. 3, the cross-sectional shapes of the opening 11 and the intake duct 12 are rectangular, but they may be circular, polygonal, or other arbitrary shapes other than rectangular.

As shown in FIG. 4, the opening 11 is formed by a plurality of holes 11a. In this embodiment, a plurality of oblong holes 11a are arranged side by side, but the mode is not particularly limited. Furthermore, although not shown, a filter is attached to the opening 11 so that foreign matter such as dust can be removed by the filter.

1 to 3, intake duct 12 is formed such that the flow path gradually narrows from one end 12a toward the other end 12b. In this embodiment, the upper surface of the intake duct 12 is inclined downward from one end 12a to the other end 12b, so that the flow path is gradually narrowed from the one end 12a to the other end 12b. Accordingly, piping and the like can be arranged above the intake duct 12 . In this embodiment, a transfer pipe 13, which will be described later, is arranged above the intake duct 12. As shown in FIG. In this way, the limited space within the package 10 is used to downsize the compressor 1 .

The compressor main body 20 includes an intake port 21 , a filter portion 22 , an intake adjustment valve 23 , a discharge port 24 , a motor 25 and a compression portion 26 . Further, the compressor main body 20 is of a screw type. A screw rotor (not shown) is accommodated in the compression unit 26 . Power is received from the motor 25 to rotate the screw rotor. adjusts the amount of intake air, compresses in the compression unit 26 , and discharges the compressed air from the discharge port 24 . Further, the compressor main body 20 is oil-cooled. Accordingly, oil is supplied to the screw rotor of the compression section 26 for cooling, lubrication and sealing. Here, the oil used for cooling, lubrication and sealing is discharged from the discharge port 24 together with the compressed air.

The oil recovery device 30 has a substantially cylindrical shape extending in the vertical direction, and is fluidly connected to the discharge port 24 of the compressor body 20 via a discharge pipe 27 . The oil recovery device 30 separates and recovers oil from the oil-containing compressed air discharged from the compressor body 20 . The recovered oil is stored in an oil recovery device 30 and supplied to the compressor main body 20 again. The compressed air from which the oil is separated is supplied to the supply destination through the transfer pipe 13 .

A gas cooler 40 is interposed in the transfer pipe 13 . Gas cooler 40 is a heat exchanger. In the gas cooler 40 , heat exchange is performed between the compressed air flowing inside the transfer pipe 13 and the normal pressure air outside the transfer pipe 13 . Here compressed air is cooled and atmospheric air is heated. The gas cooler 40 is attached to the exhaust port 14a of the top wall 14 of the package, and the heated normal pressure air is exhausted from the exhaust port.

A fan duct 42 extends below the gas cooler 40 . The fan duct 42 has a rectangular shape surrounding the gas cooler 40 in plan view. The fan duct 42 is attached to the top wall 14 of the package 10 and extends downward from the top wall 14 of the package 10 . An air cooling fan 41 is arranged in the fan duct 42 . The air cooling fan 41 is attached to the fan duct 42 via the fan cover 43 . The air cooling fan 41 is arranged to blow air toward the gas cooler 40 and supplies normal pressure air for cooling toward the gas cooler 40 .

In the compressor 1, flow paths of two types of air, compressed air and cooling air, are defined.

First, in the path of the compressed air, normal temperature and normal pressure air introduced into the package 10 through the opening 11 of the package 10 (see arrow F1 in FIG. 1) is sucked into the intake port 21 of the compressor body 20. (see arrow F2 in FIG. 1). Air sucked into the compressor body 20 is compressed in the compressor body 20 and discharged from a discharge port 24 (see FIG. 3) as high-temperature, high-pressure compressed air. The discharged compressed air is supplied to the oil recovery device 30 through the discharge pipe 27 and the oil is separated by the oil recovery device 30 . Compressed air from which oil is separated by the oil collector 30 is supplied to the gas cooler 40 through the transfer pipe 13 . The high-temperature compressed air supplied to the gas cooler 40 is cooled by the gas cooler 40 and supplied to the supply destination outside the package 10 through the transfer pipe 13 (see arrow F3 in FIG. 1).

Secondly, in the cooling air path, normal temperature and normal pressure air introduced into the package 10 through the opening 11 of the package 10 (see arrow F1 in FIG. 1) is drawn into the air cooling fan 41 (see arrow F1 in FIG. 1). See F4). The air drawn into the air cooling fan 41 is blown upward through the fan duct 42 and supplied to the gas cooler 40 (see arrow F5 in FIG. 1). The room-temperature air supplied to the gas cooler 40 cools the high-temperature compressed air in the transfer pipe 13 in the gas cooler 40, and after being heated itself, is exhausted from the exhaust port 14a of the ceiling wall 14 of the package 10. (See arrow F6 in FIG. 1).

In the compressor 1 as described above, in the present embodiment, each component is preferably arranged as follows in order to reduce noise and improve efficiency.

Inside the package 10 and outside the air intake duct 12, an air intake port is provided between one end 12a and the other end 12b of the air intake duct 12 in the direction in which the air intake duct 12 extends (hereinafter, this space is also referred to as a suitable installation space S). 21, a discharge port 24 and an oil collector 30 are arranged. In this embodiment, the intake port 21 (and the filter portion 22) and the discharge port 24 are arranged directly below the intake duct 12 (see FIGS. 1 and 3), and the oil collector 30 is arranged on the side of the intake duct 12. there is It should be noted that the intake port 21 does not necessarily have to be arranged in the suitable installation space S.

According to this configuration, inside the package 10 and outside the air intake duct 12, between one end 12a and the other end 12b of the air intake duct 12 in the direction in which the air intake duct 12 extends (hereinafter, this space is also referred to as a suitable installation space S). ), an air inlet 21, an outlet 24 and an oil collector 30 are arranged. Since this suitable installation space S is located on the side of the air intake duct 12, in order for the sound waves generated in the suitable installation space S to escape from the package 10, the sound wave must travel from the side of the air intake duct 12 to the other end 12b, It must pass through the intake duct 12 to reach one end 12 a of the intake duct 12 and exit through the opening 11 of the package 10 . Comparing the case where the sound wave goes around the intake duct 12 and goes out of the package 10 and the case where the sound wave goes out of the package 10 directly through the opening 11 of the package 10, the former can weaken the sound wave. Very quiet. In the above configuration, the intake port 21, the discharge port 24, and the oil recovery device 30 are portions that generate noise.

Further, the air intake duct 12 is composed of tubular plate members extending from the opening 11 into the package 10, for example, four plate members forming a square tube shape in this embodiment. Therefore, even if the intake duct 12 is connected to the package 10, the weight of the package 10 does not increase significantly compared to the package 10 to which the intake duct 12 is not connected. Therefore, during assembly or maintenance, the package 10 to which the intake duct 12 is connected can be easily attached or detached.

Moreover, it is preferable that the discharge pipe 27 is also arranged in the suitable installation space S. In this embodiment, the discharge pipe 27 is arranged below the intake duct 12 .

According to this configuration, the discharge pipe 27 is arranged in the suitable installation space S. Since the preferred installation space S is located on the side of the intake duct 12, the air taken in through the intake duct 12 is less likely to be thermally affected by the preferred installation space S. In other words, when comparing the case where the heat source component is arranged in the suitable installation space S and the case where the heat source component is arranged at the position facing the other end 12b of the intake duct 12, the latter is better. The temperature of the air taken in through the intake duct 12 rises under the influence of the heat source. In the above configuration, the discharge pipe 27 serves as a heat source because it is a pipe through which high-temperature air with heat of compression passes. Therefore, by arranging the discharge pipe 27 in the suitable installation space S, it is possible to suppress the temperature rise of the air taken in through the intake duct 12 . Therefore, the temperature rise of the air taken into the intake port 21 of the compressor main body 20 is suppressed, and the compression efficiency of the compressor main body 20 can be suppressed from being lowered. In addition, a decrease in the cooling efficiency of the gas cooler 40 and the air cooling fan 41 can be similarly suppressed.

Of the four walls forming the fan duct 42, the wall facing the other end 12b of the intake duct 12 is called a partition panel 42a. Partition panel 42 a is preferably arranged between gas cooler 40 and air cooling fan 41 and intake duct 12 . Preferably, the upper end 42c of the partition panel 42a is attached to the ceiling wall 14 of the package 10, and the lower end 42b of the partition panel 42a extends to a position lower than the other end 12b of the intake duct 12.

According to this configuration, the gas cooler 40 and the air cooling fan 41 can cool the air that is transferred to the supply destination outside the package 10 through the transfer pipe 13 . The air flowing through the transfer pipe 13 is compressed to a high pressure by the compressor body 20 and has a temperature rise due to the heat of compression. compressed air can be supplied to the destination. Gas cooler 40 and air-cooling fan 41 can be noise sources, but since partition panel 42a is arranged between them and air-cooling fan 41, noise from gas cooler 40 and air-cooling fan 41 passes directly through air-intake duct 12. can be prevented from leaking out of the package 10, and the noise can be reduced.

The lower end 42b of the partition panel 42a is preferably positioned lower than the straight line L connecting the upper end 11b of the opening 11 of the package 10 and the lower end 12c of the other end 12b of the air intake duct 12 . That is, when the inside of the package 10 is viewed from the opening 11 of the package 10 through the intake duct 12, it is preferable that the gas cooler 40 and the air cooling fan 41 are not visible.

According to this configuration, since the upper end 42c of the partition panel 42a is attached to the package 10, in order for the sound waves of noise from the gas cooler 40 and the air cooling fan 41 to leak out of the package 10 through the intake duct 12, the sound waves must pass below the partition panel 42a. In particular, since the lower end 42b of the partition panel 42a is located lower than the straight line L connecting the upper end 11b of the opening 11 of the package 10 and the lower end 12c of the other end 12b of the air intake duct 12, in the up-down (vertical) direction, The sound waves must go around the partition panel 42a. Therefore, the noise from the gas cooler 40 and the air cooling fan 41 does not directly leak out of the package 10, and the noise can be reduced.

Sound absorbing materials 15 and 44 are preferably attached to the inner surface of air intake duct 12 and the surface of partition panel 42a facing air intake duct 12, respectively. The sound absorbing materials 15 and 44 may be, for example, a non-woven fabric made of a plurality of fibers to form a mesh, or a porous urethane sponge. In this embodiment, as shown in FIG. 3, a thin sound absorbing material 15 is attached to all four inner surfaces of the intake duct 12 . A sound absorbing material 44 is attached to substantially the entire surface of the partition panel 42a facing the intake duct 12. As shown in FIG.

According to this configuration, the inner surface of the air intake duct 12 and the surface of the partition panel 42a on the side facing the air intake duct 12 serve as paths for sound waves of noise. Therefore, by attaching the sound absorbing materials 15 and 44 to the paths of the sound waves, the noise can be efficiently reduced.

Further, it is preferable that the flow area of the other end 12b of the intake duct 12 is larger than the sum of the opening areas of the plurality of holes 11a of the opening 11 of the package 10. As shown in FIG.

According to this configuration, the flow path area of air (sound) leaking from the opening 11 of the package 10 through the air intake duct 12 changes in the order of small, large, and small. Specifically, the other end 12b of the air intake duct 12 has the smallest flow area in the air intake duct 12, and the flow area increases as the air intake duct 12 progresses from the other end 12b to the one end 12a. Then, in the opening 11 of the package 10, the flow path area becomes small again due to the plurality of holes 11a. Due to this change in flow path area, an expansion space is formed in the intake duct 12, and the expansion space serves as a muffling chamber. Therefore, a silencing effect is obtained, and noise can be further reduced. In addition, since the channel area of the other end 12b of the intake duct 12 is larger than the total opening area of the plurality of holes 11a of the opening 11 of the package 10, a large pressure loss occurs in the channel of the intake air. You can inhale efficiently.

(Second embodiment)
The compressor 1 of the second embodiment shown in FIGS. 5 to 7 differs from the first embodiment in the shape of the intake duct 12 and the arrangement of the intake port 21 . The configuration other than these is the same as the configuration of the compressor 1 of the first embodiment shown in FIGS. Therefore, parts similar to those in the configuration shown in FIGS. 1 to 3 are denoted by similar reference numerals, and description thereof may be omitted.

5 is a cross-sectional view taken along line VV of FIG. 6. FIG. FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG.

In this embodiment, a cutout portion 12e is provided in a plate member 12d forming the lower portion of the intake duct 12. As shown in FIG. The cutout portion 12e is formed by cutting the plate material 12d into a rectangular shape at the other end 12b of the intake duct 12 . The position and shape of the notch 12e are not particularly limited. For example, the notch 12e may be a round hole provided in the center of the air intake duct 12 in the direction in which the air intake duct 12 extends.

A partition wall 12f is provided in the air intake duct 12 so as to stand vertically and extend in the same direction as the air intake duct 12. As shown in FIG. The partition wall 12f partitions the space inside the air intake duct 12 into two spaces R1 and R2 at approximately the center. Particularly, as clearly shown in FIG. 6, the notch portion 12e is arranged in the space R2 closer to the side surface of the package 10 out of the two spaces R1 and R2 inside the intake duct 12 partitioned by the partition wall 12f. there is

An intake port 21 is arranged below the notch 12e. The intake port 21 is arranged so as to open upward toward the notch 12 e , so that air can be drawn smoothly from the intake duct 12 to the compressor main body 20 .

The sound absorbing material 15 is attached to the inner surface of the intake duct 12 as in the first embodiment. For example, the sound absorbing material 15 may be attached to the entire inner surface of the air intake duct 12 except for the notch 12e. The entire inner surface includes the upper surface of the plate member 12d and both surfaces of the partition wall 12f. A bent portion 12g may be formed by bending the edge portion of the notch portion 12e by the thickness of the sound absorbing material 15 (see the enlarged dashed circle in FIG. 8). In the example of FIG. 8, the side surface 15a of the sound absorbing material 15 is in contact with the bent portion 12g. The bending portion 12g can suppress the sound transmitted through the side surface 15a of the sound absorbing material 15 at the notch portion 12e.

According to this embodiment, the air in the air intake duct 12 can be guided toward the air intake port 21 via the notch 12e, so the air intake efficiency can be improved.

As described above, specific embodiments and modifications thereof of the present invention have been described, but the present invention is not limited to the above embodiments, and various changes can be made within the scope of the present invention.

1 package-type oil-cooled screw compressor 10 package 11 opening 11a hole 11b upper end 12 intake duct 12a one end 12b other end 12c lower end 12d plate 12e notch 12f partition wall 12g bend 13 transfer pipe 14 ceiling wall 14a exhaust port 15 Sound Absorbing Material 15a Side 20 Compressor Main Body 21 Intake Port 22 Filter Section 23 Intake Adjustment Valve 24 Discharge Port 25 Motor 26 Compressor 27 Discharge Pipe 30 Oil Collector 40 Gas Cooler 41 Cooling Fan 42 Fan Duct 42a Partition Panel 42b Lower End 42c Upper End 43 Fan Cover 44 Sound absorbing material S Suitable installation space

Claims (8)

a box-shaped package having openings on the side;
an intake duct having a cylindrical shape with both ends open , one end attached to the side surface so as to surround the opening, and the other end terminating inside the package;
an oil-cooled compressor body having an intake port and a discharge port;
an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body,
Inside the package and outside the air intake duct, between the one end and the other end of the air intake duct in the direction in which the air intake duct extends , and on the side of the air intake duct excluding the one end and the other end A package-type oil-cooled screw compressor, wherein the discharge port and the oil recovery device are arranged in a space formed in the 2. The package-type oil-cooled screw compressor according to claim 1, wherein said air intake is arranged in said space . a box-shaped package having openings on the side;
a tubular air intake duct having one end attached to the side surface so as to surround the opening and the other end terminating inside the package;
an oil-cooled compressor body having an intake port and a discharge port;
an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body;
with
The discharge port and the oil collector are arranged inside the package and outside the air intake duct between the one end and the other end of the air intake duct in the direction in which the air intake duct extends,
a plate member forming a lower portion of the intake duct;
and a notch provided in the plate,
A package -type oil-cooled screw compressor, wherein the intake port is arranged below the notch. Inside the package and outside the air intake duct, a discharge pipe that fluidly connects the discharge port and the oil recovery device between the one end and the other end of the air intake duct in the direction in which the air intake duct extends. 4. The packaged oil-flooded screw compressor of claim 3, wherein a a box-shaped package having openings on the side;
a tubular air intake duct having one end attached to the side surface so as to surround the opening and the other end terminating inside the package;
an oil-cooled compressor body having an intake port and a discharge port;
an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body;
with
The discharge port and the oil collector are arranged inside the package and outside the air intake duct between the one end and the other end of the air intake duct in the direction in which the air intake duct extends,
a partition panel disposed facing the other end of the air intake duct, having an upper end attached to the top wall of the package and a lower end extending to a position lower than the other end of the air intake duct;
a transfer pipe for transferring the fluid from which the oil has been separated by the oil collector;
a gas cooler interposed in the transfer pipe within the package for cooling fluid flowing through the transfer pipe;
an air-cooling fan that is arranged in the package and blows air toward the gas cooler;
A package -type oil-cooled screw compressor, wherein the partition panel is arranged between the gas cooler and the air-cooling fan and the intake duct in a direction in which the intake duct extends. 6. The package-type oil-cooled screw compressor according to claim 5, wherein said lower end of said partition panel is positioned lower than a straight line connecting the upper end of said opening and the lower end of said other end of said intake duct. 7. The package-type oil-cooled screw compressor according to claim 5, wherein a sound absorbing material is attached to an inner surface of said intake duct and a surface of said partition panel facing said intake duct. a box-shaped package having openings on the side;
a tubular air intake duct having one end attached to the side surface so as to surround the opening and the other end terminating inside the package;
an oil-cooled compressor body having an intake port and a discharge port;
an oil recovery device that separates and recovers oil from the fluid discharged by the compressor body;
with
The discharge port and the oil collector are arranged inside the package and outside the air intake duct between the one end and the other end of the air intake duct in the direction in which the air intake duct extends,
The air intake duct is formed such that a flow path gradually narrows from the one end to the other end,
The package -type oil-cooled screw compressor, wherein the opening is formed of a plurality of holes, and the passage area of the other end of the intake duct is larger than the total opening area of the plurality of holes.

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