JP6158069B2 - air compressor - Google Patents

Description

  The present invention relates to an air compressor, and more particularly to an air compressor that cools the inside of a compressor package.

  2. Description of the Related Art Conventionally, a package configuration in which various devices constituting an air compressor are covered with a panel or the like in a box shape for the purpose of reducing noise or the like is known. Although the package configuration is excellent in soundproofing and the like, the temperature inside the package tends to increase due to various heating elements such as a compressor body. Patent Document 1 discloses an air compressor in which a cooling turbofan is provided in the vicinity of the upper upper portion of a package, sucks air from a cooling air intake port at the bottom of the package, and exhausts air from a cooling air discharge port on the top surface of the package to perform forced air cooling.

  Cooling air introduced into the package cools heating elements such as a compressor body, an electric motor, and electric / electronic components arranged in the package. In the case of an air-cooled compressor, cooling of hot compressed air and lubricating oil is performed by cooling air in addition to these heating elements. On the other hand, in the case of a water-cooled compressor, cooling of compressed air and lubricating oil is performed by cooling water, but cooling of an electric motor and electric / electronic parts is also performed by cooling air from a package opening. Therefore, even if it is a water cooling type compressor, the structure which provides a cooling fan for cooling air introduction is common.

JP 2012-122487 A

  By the way, the cooling air receives heat every time the heating element or the like is cooled, and there is a problem that sufficient heat radiation (cooling) is difficult because the temperature rises as it becomes downstream. In particular, when downsizing the compressor, there is a restriction on the arrangement of components and parts, and it is difficult to sufficiently dissipate (cool) heat. In response to such a problem, if the cooling fan is increased in size and output, it is difficult to reduce the cost and the size of the compressor.

  In order to solve the above problems, for example, the invention described in the claims is applied. That is, an air compressor having a package type housing, wherein the package type housing includes a compressor body, an electric motor that drives the compressor body, an air cooler that cools the compressed air discharged from the compressor body, and A cooling fan that circulates the cooling air inside and outside the package housing in the package housing or near the outer surface of the package housing, and includes at least a refrigerant pipe through which a refrigerant of the air cooler circulates and a control board; Has an intake port for taking in the cooling air from the outside and an exhaust port for exhausting it to the outside, and the refrigerant pipe is arranged on the upstream side of the flow of the cooling air taken in from the intake port, and in the vicinity of the refrigerant pipe And the said control board | substrate is arrange | positioned in the downstream of the flow of the said cooling air.

  Further, for example, as another application invention, an air compressor having a package type housing, wherein the package main body includes a compressor main body, an electric motor for driving the compressor main body, and oil supplied to the compressor main body. An oil cooler that cools the refrigerant, a refrigerant pipe through which the refrigerant of the oil cooler circulates, and a control board, and the cooling air flow between the outside and the inside of the package type enclosure is provided near the outer surface of the package type enclosure or the enclosure. The package housing has an intake port for taking in the cooling air from the outside and an exhaust port for exhausting the outside to the outside, and the refrigerant pipe is located upstream of the flow of the cooling air taken in from the intake port. The control board may be arranged near the refrigerant pipe and downstream of the cooling air flow.

  According to one aspect of the present invention, the cooling air introduced into the package is cooled and used for cooling other components and equipment, so that the cooling performance of the compressor is improved, and compactness and noise reduction are also achieved. It has the effect of promoting.

It is a mimetic diagram showing an example of outline composition of a package type compressor which is one embodiment to which the present invention is applied. It is a perspective view from the right rear which shows the example of an internal structure of the package type compressor of this embodiment. It is a perspective view from the left front which shows the example of an internal structure of the package type compressor of this embodiment. It is a perspective view from the left front which shows the example of an external structure of the package type compressor of this embodiment.

Hereinafter, as a package type compressor which is an embodiment to which the present invention is applied, a water-cooled package type oil-free screw compressor will be described as an example with reference to the drawings.
Here, for example, as shown in FIG. 4, the package-type compressor has a casing configured to cover almost the entire outer periphery of the compressor with a panel of metal or the like. The package housing is composed of a combination of various divided panels depending on the installation location. The panels are joined to each other with relatively high confidentiality in order to achieve a soundproofing effect and the like, but a part of the panels can be easily removed in consideration of maintainability.

FIG. 1 shows a schematic configuration of a water-cooled oil-free screw compressor 30 that is a package type compressor. The oil-free screw compressor 30 has a compressor body 1. The compressor body 1 includes a pair of screw rotors of a male rotor and a female rotor (not shown). The present invention is not limited to such a rotor, and various types of rotors such as a scroll type, a reciprocating type, a claw type, and a single or triple screw type can be applied.
A pinion gear 3 is fitted to the shaft end of the male rotor, and the pinion gear 3 meshes with a bull gear 4 fitted to one of the intermediate shafts in the gear casing 2.

  A pulley 5 is attached to the other of the intermediate shafts, and a belt 7 is mounted on the pulley 5 as a driving force transmission body. The belt 7 is also mounted on the pulley 6 attached to the shaft end of the electric motor 8, and the power of the electric motor 8 is transmitted to the compressor body 1. In addition to the pulley and belt combination, the drive mechanism may be a gear and chain, or may be a structure in which the rotor shaft and the output shaft of the electric machine 8 are directly connected. In the present embodiment, a configuration example of a pulley and a belt is applied.

  A suction throttle valve 10 that adjusts the amount of air sucked into the compressor main body 1 is disposed on the suction side of the compressor main body 1. Foreign matter is removed from the air by the suction filter 9, the air passes through the suction throttle valve 10, is sucked into the compressor body 1, is compressed to a predetermined pressure, and is discharged from the compressor body outlet. The compressed air discharged from the compressor body 1 is cooled by a water-cooled precooler 11 provided downstream thereof, and then guided to a water-cooled aftercooler 13 via a check valve 12. The compressed air cooled by the aftercooler 13 is discharged from the compressed air outlet. Here, the air passage in the aftercooler 13 is configured by a U-shaped tube, and the inlet / outlet thereof is configured by an integrated cooler header 14.

  Generally, in an oil-free screw compressor, unlike a refueling type compressor, there is nothing to cool in the process of compressing air, which is a working gas, and therefore the compressor main body generates heat particularly by heat of compression. Moreover, since the compressed gas after compression is high temperature, it may not be suitable for a demand source to use. For this reason, the oil-free compressor 30 is supplied with cooling water to each part of the compressor. The path of this cooling water is as follows.

  Cooling water cooled in the atmosphere or in a cooling tower (not shown) branches at the cooling water inlet into a path for cooling the aftercooler 13, the precooler 11, the compressor body 1, and a path for cooling the oil cooler 15. . The aftercooler 13, the precooler 11, and the path on the side for cooling the compressor main body 1 are first guided in the order of the aftercooler 13 and the precooler 11, and the air discharged from the compressor main body 1 is cooled and provided in the casing of the compressor main body 1. It is led to the cooling jacket and cools the compressor body. On the other hand, the path on the side for cooling the oil cooler 15 is led to the oil cooler 15 to cool the lubricating oil, and merges with the path on the side for cooling the aftercooler 13, the precooler 11, and the compressor body 1 and returns to the outside. It is supposed to be.

  The lubricating oil cooled by the oil cooler 11 is fitted to the bearing portion (not shown) of the compressor body 1, the timing gear portion, the pinion gear 3, and the intermediate shaft bearing portion and intermediate shaft in the gear casing 2. The lubricated bull gear 4 is lubricated and then stored in an oil sump provided at the lower portion of the gear casing 2. Thereafter, the lubricating oil is guided to the oil cooler 11 by an oil pump (not shown) and cooled, and circulates through this lubricating path.

  Next, the cooling of equipment by cooling air, which is one of the features of this embodiment, will be described. In addition to the compressor body 1, the oil-free screw compressor 30 includes a heating element such as an electric motor 8 and a control panel 16 for storing electrical and electronic products. These cooling elements are cooled by cooling air taken from the package opening. Done. The cooling air is taken in from the cooling air intake port 21 shown in FIG. 4 and discharged from the cooling air exhaust port 22. The path of this cooling air is as follows.

The electric motor 8 is provided with a self-cooling fan 25 on the rear side, and the electric motor 8 is cooled by the cooling air taken from the outside of the package and the cooling air by the self-cooling fan 25. Thereafter, the cooling air passes through the pulley 6 attached to the output shaft of the electric motor 8 and flows in the direction of the control panel 16.
As shown in FIG. 2, the control panel 16 is disposed near the outermost periphery of the side surface in the package, and a cooling air induction duct 18 is disposed in the vicinity of the inside of the package. The cooling air flowing in the direction of the control panel 16 is guided to the cooling air guide duct 18.

  An oil cooler cooling water inlet pipe 19 and an oil cooler cooling water outlet pipe 20, which are cooling water paths for cooling the lubricating oil by the oil cooler 15, are disposed inside the cooling air guide duct 18. Is used to cool the cooling air whose temperature has risen by cooling the electric motor 8. That is, the cooling air cooled by the oil cooler cooling water inlet pipe 19 and the oil cooler cooling water outlet pipe 20 in the cooling air guide duct 18 is guided to the control panel 16. After cooling the control panel 16, the cooling air is discharged to the outside by a cooling fan 17 provided for exhausting the cooling air at the upper part in the package (or the outer upper surface of the package). The pulley 6 attached to the shaft end portion of the electric motor 8 has a belt 7 attached to the outer periphery, but the inside is configured in the shape of a blade, thereby increasing the cooling air.

  As described above, according to the oil-free compressor 30, the cooling air is cooled in the low-temperature portions such as the oil cooler cooling water inlet pipe 19 and the oil cooler cooling water outlet pipe 20 that are disposed for the purpose of cooling the oil cooler 15. Furthermore, by using a structure in which the cooling air is increased by the pulley 6, the cooling performance of electrical components and the like can be improved even if the cooling air volume is small. The improvement in the cooling performance of the compressor can promote the downsizing and omission of the cooling fan, and contribute to the improvement of the flexibility of the layout of each component and device in the package, and the compressor can be further downsized. To do. Further, it is possible to reduce the opening for taking in or discharging the cooling air, and it is possible to further reduce noise.

  In the present embodiment, both the cooling water inlet pipe 19 and the cooling water outlet pipe 20 are arranged in the vicinity of the upstream of the cooling air to the control board 16, but only the cooling water inlet pipe 19 is in the vicinity of the upstream. It is good also as a structure arrange | positioned. The temperature of the refrigerant (cooling water) flowing through the cooling water inlet pipe 19 is sufficiently lowered in the outside air or the cooling tower, so that the pipe 19 can also ensure a sufficiently low temperature, but performs heat exchange with oil and compressed air. After that, the temperature of the refrigerant (cooling water) increases accordingly. Therefore, when the temperature of the cooling water outlet pipe 20 is, for example, equal to or higher than the cooling air guided to the cooling air guide duct 18, only the cooling water inlet pipe 19 is provided in the vicinity of the upstream side of the control board 16. It is good.

  In this embodiment, the oil-free screw compressor 30 has been described as an example. However, in the case of an air-cooled oil-free screw compressor, a dryer pipe or a compressor is used to dehumidify compressed air instead of the cooling water pipe. The same effect can be obtained by using a relatively low temperature mechanism such as coolant piping used for cooling the main body. Further, even in the case of an oil supply type air compressor that injects oil into the compression working chamber, dryer piping or the like can be used, and in the case of a water injection type air compressor that injects water into the compression working chamber. A water supply pipe or a dryer pipe to a cooling device for cooling the water can also be used. Various configurations can be applied without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Compressor body, 2 ... Gear casing, 3 ... Pinion gear, 4 ... Bull gear, 5, 6 ... Pulley, 7 ... Belt, 8 ... Electric motor, 9 ... Suction filter, 10 ... Suction throttle valve, 11 ... Precooler, 12 ... Check valve, 13 ... After cooler, 14 ... After cooler header, 15 ... Oil cooler, 16 ... Control panel, 17 ... Cooling fan, 18 ... Cooling air induction duct, 19 ... Oil cooler cooling water inlet piping, 20 ... Oil cooler Cooling water outlet piping, 21 ... cooling air intake port, 22 ... cooling air exhaust port, 25, self-cooling fan, 30 ... oil-free compressor

Claims (4)

A package body, a compressor main body, an electric motor that drives the compressor main body, an air cooler that cools the compressed air discharged from the compressor main body, a refrigerant pipe through which a refrigerant of the air cooler flows, and a control board; Comprising at least
A cooling fan that circulates cooling air outside the package type housing and inside the package type housing in the package type housing or in the vicinity of the outer surface of the package type housing;
The package type housing has an intake port for taking in the cooling air from the outside, and an exhaust port for exhausting to the outside,
The refrigerant pipe is arranged on the upstream side of the flow of cooling air taken from the intake port,
The control board is disposed in the vicinity of the refrigerant pipe and downstream of the cooling air flow,
An air compressor in which the electric motor is disposed on the downstream side of the intake port and the upstream side of the refrigerant pipe. The air compressor according to claim 1 ,
An air duct is provided adjacent to the control board to guide the cooling air taken in from the intake port to the exhaust port side,
The refrigerant pipe is an air compressor disposed inside an air duct. A package body, a compressor main body, an electric motor that drives the compressor main body, an oil cooler that cools oil supplied to the compressor main body, a refrigerant pipe through which refrigerant of the oil cooler flows, and a control base And at least
A cooling fan that circulates cooling air inside the package housing and inside the package housing in the package housing or near the outer surface of the package housing,
The package type housing has an intake port for taking in the cooling air from the outside, and an exhaust port for exhausting to the outside,
The refrigerant pipe is arranged on the upstream side of the flow of cooling air taken from the intake port,
The control board is disposed in the vicinity of the refrigerant pipe and downstream of the cooling air flow,
An air compressor in which the electric motor is disposed on the downstream side of the intake port and the upstream side of the refrigerant pipe. The air compressor according to claim 3 ,
An air duct is provided adjacent to the control board to guide the cooling air taken in from the intake port to the exhaust port side,
An air compressor in which the refrigerant pipe is disposed inside an air duct.

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