JP7106691B1 - Fluid mechanical system - Google Patents

Abstract

A fluid machine system in which exhaust air from another fluid machine covers the amount of heat required to prevent freezing or the like. A fluid machine system having a plurality of package type fluid machines each having a compressor body for compressing a fluid and a power source for operating the compressor body, a circulation path connecting an exhaust port and an exhaust port of the other package type fluid machine; and a circulation path located on the path of the circulation path to permit and restrict the flow of exhaust air discharged to the outside of the circulation path. The flow path switching device causes at least part of the exhaust air discharged from the exhaust port of the one package-type fluid machine to flow into the other package-type fluid machine. [Selection diagram] Fig. 1

Description

The present invention relates to fluid mechanical systems.

Patent Literature 1 discloses a compressor structure that discharges drain generated during cooling of compressed gas to the outside of the machine without freezing it. Patent Literature 1 discloses that "one end of the bypass circuit communicates with the primary side of the aftercooler, and the other end communicates with a drain circuit that communicates with the lower end of the drain collecting portion of the drain separator. After being discharged into the drain circuit as a mixed fluid together with part of the compressed gas in the drain separator and passing through the restriction, it joins with the warm compressed gas introduced through the bypass circuit. The compressed gas in the mixed fluid does not drop in pressure abruptly, and as a result, the exhaust noise is reduced and the drain is prevented from freezing."

JP 2003-176784 A

As described in Patent Document 1, the internal structure of a fluid machine such as a compressor has portions where freezing is not allowed. In the installation environment of fluid machinery, the outside temperature of the installation environment is an important condition. For example, if the outside temperature drops below freezing, circulating water and lubricating oil may freeze or increase in viscosity, and electronic devices may freeze. . There is a demand for a technology that efficiently protects against freezing when installed in a low-temperature environment.

In order to solve the above problems, for example, the technology described in the claims is used. The present application discloses a plurality of techniques for solving the above problems. One example is a package type fluid having a compressor body for compressing a fluid and a power source for operating the compressor body. A fluid machine system having a plurality of machines, comprising: a circulation path connecting an exhaust port of one package-type fluid machine and an exhaust port of another package-type fluid machine; a channel switching device for permitting and restricting the flow of the exhaust air discharged to the outside of the circulation path; It is made to flow into a package-type fluid machine.

According to the present invention, in a fluid machine system installed in a place with a low outside air temperature, such as a sub-zero environment, the heat of the fluid machine that exhausts relatively high-temperature exhaust air is stopped or the heat of the fluid machine with a lower load is stopped. It can be used to prevent freezing of machines.

Problems, configurations, and effects other than those described above will be clarified by the following description of the embodiments.

1 is a schematic diagram showing the configuration of a package-type compressor system according to an embodiment of the present invention; FIG. FIG. 2 is a schematic diagram showing how exhaust air from one package-type compressor flows into the other package-type compressor in the package-type compressor system shown in FIG. 1 ; FIG. 2 is a schematic diagram showing how the exhaust air from one package-type compressor and the exhaust air from the other package-type compressor are discharged to the outside of an external duct in the package-type compressor system shown in FIG. 1 ;

EMBODIMENT OF THE INVENTION Hereafter, the form of the thing which implements this invention is demonstrated using drawing.

FIG. 1 shows a schematic configuration of a compressor system according to this embodiment. The compressor system includes a plurality of package-type compressors 1a and 1b, and has a configuration in which cooling air flowing through these compressors is connected via an external duct 160. As shown in FIG. The configuration will be described below, but in this embodiment, the same compressor is applied to the package compressors 1a and 1b, and the description will mainly be given to 1a.

The package-type compressor 1a has components such as a drive source 101a, a gearbox 102a, a first-stage compressor 103a, and a two-stage compressor 104a mounted on a common base (not shown) or the like. A cover 105a is provided on the side surface and the top surface to cover the entirety of these components.

The driving source 101a is an electric motor, and provides rotational force to the first-stage compressor main body 103a and the second-stage compressor main body 104a through the gearbox 102a. In this embodiment, an electric motor is used as the drive source, but the present invention can also be applied to a drive source that utilizes natural energy such as an internal combustion engine, wind power, and water power. Also, the electric motor 101a is described as having a self-excited fan for taking in air from the outside of the cover 105a, but it may be configured to take in outside air using a separately-excited fan.

The speed increaser 102a is composed of, for example, a combination of a pinion gear and a bull gear, and is mechanically connected to the first-stage compressor main body 103a and the two-stage compressor main body a to change their rotation ratio. The gearbox 102a is not limited to this, and may be a power transmission mechanism using a chain, belt, pulley, or the like. In this example, the configuration includes the speed increaser 102a, but the present invention can also apply a direct connection configuration in which the compressor main body and the driving source do not use the speed increasing mechanism.

The first-stage compressor main body 103a and the second-stage compressor main body 104a each have, for example, a positive displacement compression mechanism, and constitute a two-stage compressor. As positive displacement compressors, various types such as screw, scroll, reciprocating, claw and the like can be applied. The present invention is not limited to this, and may be a multi-stage configuration including a compressor body in addition to the first-stage compressor body 103a and the two-stage compressor body 104a, and 103a and 104a function as single-stage compressors. It may be a configuration.

The cover 105a has an intake port 107a and an exhaust port 108a communicating with the outside on its side surface or top surface. The intake port 107a is connected to an internal intake duct 106a that introduces outside air from the counter-output side of the electric motor 106a toward the inner side of the cover 105a. Outside air is taken into the inside of the package type compressor 1 by the rotation of the self-excited fan of the electric motor 101a. Some of the outside air taken in from the intake port 107a is used as cooling air for components such as the electric motor 101a, the gearbox 102a, the first-stage compressor main body 103a and the second-stage compressor main body 104a, and some is used for the first-stage compression. Air is drawn in through 103a of the machine body. If an air-cooled heat exchanger is provided for cooling the compressed gas, outside air may also be used for this heat exchange.

In this embodiment, the intake port 107a is arranged downstream of the driving source 101a, and the exhaust port 108a is arranged on the side of the compressor body (103a and 104a). That is, in general, the compressor tends to be a heating element with a higher temperature in the first-stage compressor main body 103a and the second-stage compressor main body 104a than in the heat generated by the electric motor 101a due to the heat of compression. Therefore, each component is cooled by outside air in the order in which the temperature becomes relatively low.

The exhaust port 108a is connected to an internal exhaust duct 109a extending inside the cover 105a, and external air taken into the package compressor 1 (excluding external air sucked by the main body of the compressor) flows through the package compressor 1. (external duct 150a to be mentioned).

The control unit 110a is a device that performs various controls of the package-type compressor 1a. good.). The power conversion device 111a turns on/off the electric power supplied to the electric motor 101a and changes the electric power frequency according to a command from the control unit 110a, thereby causing the package-type compressor 1 to operate at a variable speed. Variable speed operation includes, for example, P, PI, PID control operation, load/no load operation, and the like. Note that the control unit 110a may be configured as an external control device via a wired or wireless communication line.

Next, the external duct 150 and the channel switching device 160 will be described. The external duct 150 connects the exhaust port 109a of the package type compressor 1a and the exhaust port 109b of the package type compressor 1b. The channel switching device 160 is a channel switching mechanism that is positioned in the middle of the external duct 150 and that permits or restricts discharge of exhaust air flowing through the external duct 150 to the outside of the external duct. In this embodiment, a rotating plate that can be tilted by rotation is used, but the present invention is not limited to this configuration. The rotation of the external duct 15 can be switched manually or automatically, and the rotation angle (that is, the degree of opening at which exhaust air flowing through the external duct is discharged to the outside of the external duct) can be switched in multiple stages.

FIG. 2 shows an overview of the operation mode of this embodiment. First, while the package-type compressor 1a is in operation (for example, during full-speed operation), high-temperature exhaust air that has cooled the internal heating element is discharged to the external duct 150 from the exhaust port 109a. At this time, when the two-stage compressor main body 1b is stopped or in no-load operation, if the outside air temperature is equal to or lower than a predetermined temperature, components such as the electric motor 101b and the compressor main bodies 103a and 104b included in the package-type compressor 1b are relatively low temperature. Such a low temperature condition causes freezing of components of the package compressor 1b and an increase in the viscosity of the lubricating fluid (oil or water), which may cause a load or malfunction in starting or switching to load operation.

Therefore, in the present embodiment, exhaust air from the package-type compressor 1a, which generates a relatively large amount of heat during operation, is flowed through the duct 150 into the package-type compressor 1b, which generates a relatively low amount of heat, and is heated. As a result, one of the features is to suppress freezing and an increase in the viscosity of the lubricating liquid, which may cause obstacles when starting the package-type compressor 1b or switching to load operation.

More specifically, by "closing (prohibiting or restricting discharge to the outside from the external duct)" the flow path switching device 160, from the exhaust port 109b of the package-type compressor 1b, from the package-type compressor 1a Some or all of the high temperature exhaust air flows to the package type compressor 1b to heat its components.

Next, a case where the package type compressor 1b is also started or shifted to load operation will be described.
FIG. 3 shows a state in which the channel switching device 160 is "opened (fully opened)". In this case, the high-temperature cooling air flowing out from the exhaust ports 109a and 109b of the package type compressors 1a and 1b is discharged to the outside of the external duct 150 by the flow switching device 160, and a normal cooling effect can be expected. can be done.

Thus, according to the present embodiment, the package-type compressor 1b that is stopped or under low load can be easily heated by the high-temperature exhaust air from the other package-type compressor 1a that generates a relatively large amount of heat. It is possible to easily perform equipment maintenance and suppress performance deterioration according to the outside temperature. In particular, for a package-type compressor that requires heating, there is no need to add a special heating mechanism or energy, and the exhaust heat is used, which contributes to an energy-saving effect.

Although the embodiments of the present invention have been described above, the present invention is not limited to the various configurations described above, and various modifications can be made without departing from the spirit of the present invention. For example, the number of package-type compressors is not limited to two, but three or more may be used. may For example, if one rated specification is higher than the other, the degree of opening of the channel switching device 160 may be appropriately adjusted to prevent excessive heating.

In addition, in the case of a system that generates compressed gas by so-called multiple unit control in which multiple package-type compressors merge into multiple discharge piping systems, the flow path is changed according to the switching between operation and stop of each package-type compressor. The degree of opening of the switching device 160 may be automatically varied.

Further, in the present embodiment, the compressor main body that generates compressed gas from the atmosphere (air) has been described, but the fluid machine that compresses other gases may also be used.

DESCRIPTION OF SYMBOLS 1a, 1b... package type compressor, 101a, 101b... drive source, 102a, 102b... speed increaser, 103a, 103b... first stage compressor main body, 104a, 104b... two stage compressor main body, 105a, 105b... cover, 106a, 106b... Internal air intake duct, 107a, 107b... Air inlet, 108a, 108b... Air outlet, 109a, 109b... Internal air exhaust duct, 101a, 101b... Control unit, 111a, 111b... Power converter, 150... External duct, 160 Flow switching device

Claims (5)

a compressor body that compresses a fluid;
A fluid machine system having a plurality of packaged fluid machines each having a power source for operating the compressor body,
The fluid mechanical system is
a circulation path connecting the exhaust port of the first package type fluid machine and the exhaust port of the second package type fluid machine;
a flow path switching device positioned on the path of the circulation path for permitting and restricting the flow of exhaust air discharged to the outside of the circulation path;
When the first package-type fluid machine is in operation and the second package-type fluid machine is stopped or in a no-load operation, the flow path switching device operates from the exhaust port of the first package-type fluid machine. A fluid machine system that switches at least part of the exhaust air to flow into a second package type fluid machine. The fluid mechanical system according to claim 1,
The fluid mechanical system , wherein the flow path switching device performs switching so as to prohibit or restrict the flow of the exhaust air discharged from the external duct . The fluid mechanical system according to claim 1,
A fluid machine in which the flow path switching device permits the flow of exhaust air discharged to the outside of the circulation path when the second package-type fluid machine switches from stop to operation or from no-load operation to load operation. system. The fluid mechanical system according to claim 1,
A fluid machine system, wherein at least one of the package type fluid machines has different rated specifications from the other package type fluid machines. The fluid mechanical system according to claim 1,
A fluid machine system, wherein the package-type fluid machine is a package-type compressor that generates compressed gas from the atmosphere.

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