JP5672171B2 - Turbo compressor - Google Patents

Description

  The present invention relates to a turbo compressor used for a power source or a process in a factory, and more particularly, to a turbo compressor that is compact and quiet by incorporating an air discharge silencer chamber in a casing.

  Conventionally, as described in Patent Document 1, as a turbo compressor, a two-stage turbo compressor is proposed in which a fluid compressed by a first stage compressor is further compressed by a second stage compressor and discharged. Has been. Such a turbo compressor has a casing made of a casting, and a first stage compressor and a second stage compressor are installed on the casing. The impeller of the first stage compressor and the impeller of the second stage compressor are connected by a rotating shaft. The rotation shaft is arranged in parallel with the output shaft of the drive motor, and is rotated by the drive motor via a gear device at the center.

  In the turbo compressor, outside air is sucked from the suction port, and the outside air is compressed by the first stage compressor and sent to the first cooling chamber of the casing. A first heat exchanger is accommodated in the first cooling chamber. The compressed air is cooled by the first heat exchanger, sent from the first cooling chamber to the second stage compressor, and further compressed. The air compressed by the second stage compressor is sent to the second cooling chamber of the housing. A second heat exchanger is accommodated in the second cooling chamber. The compressed air is cooled by the second heat exchanger and discharged from the second cooling chamber through the discharge port.

  The turbo compressor described in Patent Document 1 has a devised layout in the housing for miniaturization, and the housing includes a first cooling chamber containing a first heat exchanger, The second cooling chamber containing the heat exchanger and the oil tank containing the lubricating oil are closely arranged.

  In a general centrifugal turbo compressor, when the compressed air becomes surplus in a factory or the like and the consumption amount of the compressed air is reduced with respect to the amount of sucking outside air, the outlet pressure of the compressor rises. At this time, when the pressure value detected by the sensor installed at the compressor outlet exceeds a preset value, the vent valve installed at the second cooling chamber outlet is opened, and the compressed air is sent to the outside air. discharge. Moreover, in order to reduce the noise generated by the opening of the air release valve, an air discharge silencer is installed between the air release valve and the air outlet.

Japanese Patent No. 3470410

  By the way, as the above-described centrifugal silencer for a centrifugal turbo compressor, one having a low pressure loss must be used in order to prevent a surging phenomenon. Surging is a phenomenon in which backflow of air occurs in the impeller. When surging occurs, normal operation cannot be performed with intense pulsation. For this reason, it is common to use a muffler with a small pressure loss or a duct with a sound-absorbing material attached to the discharge silencer to mute and decelerate the air. However, since the noise reduction effect is commensurate with the size of the blast silencer, there is a problem that the blast noise cannot be sufficiently suppressed in a compact centrifugal turbo compressor.

  Therefore, the present invention is proposed in view of the above-described circumstances, and can be installed in a narrow place including an air discharge silencer. Also, when the compressed air is discharged to the outside air. An object of the present invention is to provide a turbo compressor capable of sufficiently reducing noise.

  In order to solve the above-described problems and achieve the above object, a turbo compressor according to the present invention has the following configuration.

[Configuration 1]
A housing, a centrifugal first stage compressor installed on the housing, a centrifugal second stage compressor installed on the housing, a first stage compressor and a second stage compressor; And a drive means for driving. The housing houses a first cooling chamber in which a first heat exchanger is housed and outside air compressed by the first stage compressor is sent, and a second heat exchanger is housed in the housing. The air that has passed through the first cooling chamber is further compressed by the second stage compressor, sent to the second cooling chamber, the oil tank that contains the lubricating oil sent to the driving means, and the second cooling chamber to be released to the atmosphere. It is divided into an air discharge silencer chamber to which exhaust is sent, and the air discharge silencer chamber houses the air discharge silencer and is located between the first cooling chamber and the second cooling chamber and the oil tank. It is characterized by.

[Configuration 2]
In the turbo compressor having the configuration 1, the housing is integrally formed of a casting together with a partition plate that partitions the interior into a first cooling chamber, a second cooling chamber, an oil tank, and a blast silencer chamber. It is characterized by that.

  In the turbo compressor according to the present invention, by having the configuration 1, the air discharge silencer chamber is located between the first cooling chamber and the second cooling chamber, and the oil tank in the housing. The silencing effect by the air discharge silencer can be increased, and an air layer exists between the oil tank and the first and second cooling chambers, and exhaust gas passing through the air discharge silencer chamber causes The temperature rise of the lubricating oil is suppressed.

  In the turbo compressor, the manufacturing cost can be reduced by reducing the number of parts, and the turbo compressor can be installed in a narrow place including an air discharge silencer.

  Further, in the turbo compressor according to the present invention, by having the configuration 2, the casing is integrally formed of the casting together with the partition plate for partitioning the inside, so that the silencing effect by the air blowing silencer is increased. be able to.

  That is, the present invention provides a turbo compressor that can be installed in a narrow place including a wind release silencer and that can sufficiently reduce noise when exhaust is discharged to the outside air. It can be done.

It is a top view of the turbo compressor concerning the embodiment of the present invention. 1 is a side view of a turbo compressor according to an embodiment of the present invention. 1 is a front view of a turbo compressor according to an embodiment of the present invention. It is a cross-sectional view which shows the structure of the housing | casing of the turbo compressor which concerns on embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a plan view of a turbo compressor according to an embodiment of the present invention.

  FIG. 2 is a side view of the turbo compressor according to the embodiment of the present invention.

  FIG. 3 is a front view of the turbo compressor according to the embodiment of the present invention.

  The turbo compressor according to the present invention is a so-called geared turbo compressor, and has a casing 46 made of a casting, as shown in FIGS. 1 to 3, on the casing 46, a centrifugal first stage. A compressor 5 and a centrifugal second stage compressor 6 are installed.

  This turbo compressor rotates the impellers (impellers) of the first-stage and second-stage compressors 5 and 6 at high speed via the gear unit 3 by means of the output shaft 2 of the drive motor 1 serving as a drive means. This is a two-stage compressor that compresses air (gas) by giving kinetic energy to the air (gas) and efficiently decelerating and converting it to pressure. In this turbo compressor, intermediate cooling is performed to approximate isothermal compression, and volumetric efficiency is increased to increase overall compression efficiency.

  The drive motor 1 is a so-called flange motor, and is fixed on the housing 46 via the flange 1a. The rotating shaft 4 is disposed in parallel to the output shaft 2 of the drive motor 1 and is connected to the output shaft 2 via a gear device (speed increaser) 3. A first stage compressor 5 is provided at the end of the rotating shaft 4 on the drive motor 1 side. A second stage compressor 6 is provided at the opposite end of the rotating shaft 4. The rotating shaft 4 is transmitted with a driving force through the gear unit 3 at the center, and the impeller of the first stage compressor 5 is attached to one end side which is the drive motor 1 side, and the second stage compressor is attached to the other end side. Six impellers are attached.

  The first-stage and second-stage compressors 5 and 6 are configured to include a diffuser and a spiral chamber around an impeller attached to the rotary shaft 4. The first-stage and second-stage compressors 5 and 6 accelerate the air (gas) sucked in the central portion of the impeller radially outward by rotating the impeller at high speed. The accelerated air is decelerated through the diffuser and swirl chamber, and the speed is converted to pressure.

  In the gear device 3, a large gear (bull gear) is connected to the output shaft 2 of the drive motor 1, and a small gear (pinion gear) meshed with the large gear rotates at a speed to transmit the driving force to the rotating shaft 4. To do.

  FIG. 4 is a cross-sectional view showing the configuration of the casing of the turbo compressor according to the embodiment of the present invention.

  As shown in FIG. 4, the housing 46 is filled with lubricating oil necessary for the first and second cooling chambers 44 and 45 that serve as a passage for introducing air (gas), the bearing of the rotary shaft 4, and the gear device 3. The oil tank 60 is divided into an air discharge silencer chamber (blow tank) 80. The first cooling chamber 44 and the second cooling chamber 45 accommodate a first heat exchanger (intercooler) 47 and a second heat exchanger (aftercooler) 48 for cooling air (gas). Yes. The casing 46 is integrally formed of a casting together with a partition plate that partitions the interior into a first cooling chamber 44, a second cooling chamber 45, an oil tank 60, and a ventilating silencer chamber 80. The air discharge silencer chamber 80 houses the air discharge silencer 82 and is located between the first cooling chamber 44 and the second cooling chamber 45 and the oil tank 60.

  As shown in FIG. 1, the suction pipe 7 and the suction filter 8 of the first stage compressor 5 are arranged on the side of the drive motor 1. The suction filter 8 is for preventing inhalation of foreign matter in the atmospheric air. In this turbo compressor, the outside air is sucked from the suction pipe 7 by the first stage compressor 5, and this outside air is compressed by the first stage compressor 5, passes through the air passage portion of the housing 46, and is shown in FIG. As shown, the air is sent from the first cooling chamber inlet 44 a to the first cooling chamber 44 of the housing 46.

  The compressed air sent to the first cooling chamber 44 is about 200 ° C., but is cooled by the first heat exchanger 47. The air cooled by the first heat exchanger 47 is sent from the first cooling chamber 44 to the second stage compressor 6 via the first cooling chamber outlet 44 b and the pipe 9.

  The second stage compressor 6 further compresses the sent air and sends the compressed air to the second cooling chamber 45 of the casing 46 from the second cooling chamber inlet 45 a via the air passage portion 10 of the casing 46. The air sent to the second cooling chamber 45 is cooled to about 40 ° C. by the second heat exchanger 48. The air cooled by the second heat exchanger 48 is discharged from the second cooling chamber 45 through the second cooling chamber outlet 45b. The air discharged from the second cooling chamber outlet 45b is sent through a pipe (not shown) for use in a factory or the like.

  In the turbo compressor, when the compressed air becomes surplus in a factory or the like, and the consumption amount of the compressed air is reduced with respect to the amount of sucking outside air, the outlet pressure of the compressor increases. At this time, when the pressure value detected by the sensor installed at the compressor outlet exceeds a preset value, the air discharge valve 83 is opened. At this time, the compressed exhaust that is not used is sent into the blast silencer chamber 80 via the pipe 81 connecting the second cooling chamber outlet 45b and the blast silencer chamber inlet 80a. The exhaust gas sent to the discharge silencer chamber 80 passes through the discharge silencer 82 accommodated in the discharge silencer chamber 80 and is discharged to the outside air from the discharge silencer chamber outlet 80b. The air discharge silencer 82 introduces compressed exhaust gas, releases it in the air discharge silencer chamber 80 while silencing it, and reduces the flow rate of the exhaust gas, thereby reducing noise at the air outlet of the turbo compressor. The air release silencer 82 is configured to have a structure including a muffler with a small pressure loss and a duct on which a sound absorbing material is affixed to suppress noise.

  In this turbo compressor, for the lubrication of other units constituting this turbo compressor, that is, a suction control valve that controls the flow rate of air, a control panel that controls operation and stop and control valves, bearings, and gears The required oil supply device and the smoke exhaust device that keeps the inside of the housing 46 at a negative pressure in order to prevent the lubricating oil from leaking out of the housing 46 are all installed on the housing 46 to save space. ing.

  Further, in this turbo compressor, since the discharge silencer 82 is housed in the housing 46, the number of parts can be reduced, the manufacturing cost can be reduced, and the discharge silencer is also included. It can be installed in a small place.

  Further, in this turbo compressor, the air discharge silencer chamber 80 is located between the first cooling chamber and the second cooling chamber 44, 45 and the oil tank 60, and the casing 46 is made of cast metal. By being configured integrally, it is possible to increase the silencing effect of the wind silencer 82. For example, even if the sound pressure level when compressed exhaust is discharged exceeds 120 dB, this wind noise can be sound-insulated and attenuated by the wind silencer chamber 80, and the outside of the turbo compressor Noise can be sufficiently reduced.

  Further, in this turbo compressor, the oil tank is provided by the presence of an air layer between the oil tank 60 and the first and second cooling chambers 44 and 45 and by the exhaust gas passing through the air discharge silencer chamber 80. The temperature rise of the lubricating oil in 60 is suppressed. Conventionally, when the oil tank 60 is built in the housing 46, heat exchange occurs in the partition walls between the first and second cooling chambers 44 and 45, and the lubricating oil absorbs heat from the high-temperature air, and the cooled air is discharged. There is a risk that it will warm again. When this phenomenon occurs, it is necessary to increase the capacity of the oil cooler, and the efficiency of the compressor is reduced due to an increase in the air temperature. In this turbo compressor, since the temperature rise of the lubricating oil in the oil tank 60 is suppressed, it is not necessary to increase the capacity of the oil cooler, and the compressor efficiency may be lowered due to the rise in air temperature. Absent.

  The present invention is applied to a turbo compressor used for a power source or a process in a factory, and in particular, to a turbo compressor that is compact and quiet by incorporating a blast silencer chamber in a casing.

5 First Stage Compressor 6 Second Stage Compressor 44 First Cooling Chamber 45 Second Cooling Chamber 46 Housing 47 First Heat Exchanger 48 Second Heat Exchanger 60 Oil Tank 80 Breathing Silencer Chamber

Claims (2)

A housing,
A centrifugal first stage compressor installed on the housing;
A centrifugal second stage compressor installed on the housing;
Drive means for driving the first stage compressor and the second stage compressor,
Inside the housing is a first cooling chamber in which the first heat exchanger is housed and the outside air compressed by the first stage compressor is sent, and a second heat exchanger is housed in the first cooling chamber. A second cooling chamber in which air is further compressed and sent by the second stage compressor, an oil tank that contains lubricating oil sent to the driving means, and an exhaust discharged to the atmosphere through the second cooling chamber. It is partitioned from the blast silencer room that is sent,
The turbo-compressor, wherein the ventilator silencer chamber houses the ventilator silencer and is located between the first cooling chamber and the second cooling chamber and the oil tank. The casing is integrally formed of a casting, with a partition plate that partitions the interior into the first cooling chamber, the second cooling chamber, the oil tank, and the air discharge silencer chamber. The turbo compressor according to claim 1, wherein:

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