JP3480009B2 - Centrifugal compressor - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a centrifugal compressor. 2. Description of the Related Art FIGS. 6 to 8 show an example of a conventional centrifugal compressor. The centrifugal compressor employs an impeller (shown in the drawing) which sucks gas from outside the compressor and compresses the gas. ), And an intercooler unit 2 for cooling the compressed gas discharged from the first scroll unit 1.
A second-stage scroll section 3 containing an impeller (not shown) for sucking and compressing the compressed gas cooled by the intercooler section 2 and cooling the compressed gas discharged from the second-stage scroll section 3 After-cooler section 4
A gear box housing part 5 containing a speed increasing gear mechanism connected to impellers in the scroll parts 1 and 3
And a motor 6 for driving the speed increasing gear mechanism. The outlet of the first-stage scroll section 1 and the inlet of the intercooler section 2 are connected by a communication pipe 7, and the outlet of the intercooler section 2 and the inlet of the second-stage scroll section 3 are connected by a communication pipe 8. The outlet of the second intercooler 4 and the inlet of the aftercooler section 4 are connected by a communication pipe 9 respectively. The scroll portions 1 and 3 and the gear box housing portion 5 are formed by casting metal (cast iron), and the body portions of the cooler portions 2 and 4 are formed of a metal plate (steel plate). Is formed by baking. The two scroll parts 1, 3 are fixed to the side surface of the gear box housing part 5, and the gear box housing part 5, the motor 6, and the two cooler parts 2, 4 are fixed to a base 10 respectively. It is attached to the panel 11. Further, a lubricating oil pump (not shown), an oil cooler (not shown), and an oil filter (not shown) are attached to the common base plate 11. The common base 11 has a structure in which metal plate members are assembled by welding, and a lubricating oil tank is formed inside. The lubricating oil stored in the lubricating oil tank is
The above-described lubricating oil pump passes through an oil cooler and an oil filter, through which a bearing portion of an impeller and a bearing portion of a gear constituting a speed increasing gear mechanism, and a meshing portion of the gear are formed. Injected,
The lubricating oil injected into each of these parts is collected in the lubricating oil tank. In FIGS. 6 to 8, reference numeral 12 denotes a gas inlet formed in the first-stage scroll section 1, and reference numeral 13 denotes a gas discharge pipe connected to the after-cooler section 4. . In the centrifugal compressor having the above configuration,
When the motor 6 is operated, the rotational force of the motor 6 is transmitted to the gear box housing part 5 via the speed increasing gear mechanism in the gear box housing part 5 and to the impellers in the scroll parts 1 and 3, and the impellers rotate. The gas to be compressed is sucked from the outside of the compressor through the gas inlet 12 into the inside of the first scroll part 1. The gas is compressed when passing sequentially through the first-stage scroll unit 1, the inter-cooler unit 2, the second-stage scroll unit 3, and the after-cooler unit 4, and is appropriately cooled to a predetermined pressure. The compressed gas is discharged outside the compressor. However, in the conventional centrifugal compressor, the two coolers 2, 4 and the communication pipes 7, 8, 9 formed of a metal plate and exposed to the outside.
Since the gas flows through the inside, noise is high when the centrifugal compressor is operating. The present invention solves the above-mentioned situation,
It is an object of the present invention to provide a centrifugal compressor with low noise during operation. In order to achieve the above object, a centrifugal compressor according to the present invention has a compressor base having an intercooler chamber and an aftercooler chamber, and a gear including a speed-increasing gear mechanism. A compression unit including a box housing portion, a first-stage scroll portion containing an impeller connected to the speed-increasing gear mechanism, and a second-stage scroll portion containing an impeller connected to the speed-increasing gear mechanism. A first-stage discharge flow path for guiding the gas compressed in the first-stage scroll section into the intercooler chamber, and a second-stage discharge path for guiding the gas cooled in the intercooler chamber into the second-stage scroll section. The two-stage suction passage and the second-stage discharge passage that guides the gas compressed in the second-stage scroll section into the aftercooler chamber.
It is provided inside the compressor body of integral casting . According to the centrifugal compressor of the present invention, each part constituting the compressor main body is formed by integral casting, and a gas flow path is provided inside the compressor main body. The pressure loss of the gas flowing inside the compressor body can be reduced by setting the shape of the compressor to the optimum shape. Further, since the thickness of the member forming the gas flow path inside the compressor body is relatively large, noise during operation is reduced. Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show an embodiment of a centrifugal compressor according to the present invention, in which 14 is a compressor body, and the compressor body 14 has a compressor base 15 having a hollow structure,
Gear box housing part 16, first stage scroll part 17, second stage scroll part 18, motor mount 1
And a structure in which these parts are integrally formed by casting. A lubricating oil storage chamber 22 for storing lubricating oil is formed at a portion near the one end A side inside the compressor base 15, and a portion near the other end B side inside the compressor base 15 is formed. ,
An intercooler room 20 containing a heat exchange element (not shown) and an aftercooler room 21 containing a heat exchange element (not shown) are formed. Opening covers 29 and 30 are attached to the end of the compressor base 15 near the one end A side so as to separately cover the openings 26 and 27 of the lubricating oil storage chamber 22, respectively. At the end near the other end B side of the opening 15, the opening 2 of the intercooler chamber 20 and the aftercooler chamber 21 is provided.
An opening cover 28 is attached so as to integrally cover 4 and 25. The opening cover 28 is provided with a pipe (not shown) for supplying and receiving a cooling medium to and from the heat exchange elements housed in the cooler chambers 20 and 21. By flowing a cooling medium from the outside of the compressor base to each heat exchange element, heat exchange is performed between the cooling medium and the gas inside the two cooler chambers 20 and 21 to cool the gas. It has become. The aftercooler chamber 21 is provided with a gas outlet 46 which opens to the outside. Further, a lubricating oil supply port 23 for supplying lubricating oil to the lubricating oil storage chamber 22 is provided on an upper side surface of the end of the compressor base 15 near the one end A side. The inside of the base 15 extends vertically from the lubricating oil storage chamber 22 to the lubricating oil suction port 43 provided on the upper surface of the end near the other end B side of the compressor base 15 through the bottom of the after-cut after cooler chamber 21. A lubricating oil suction channel 44 is formed. The gear box housing 16 is provided above the compressor base 15, and contains therein a speed increasing gear mechanism (not shown) having an input shaft and an output shaft. A gear box cover 31 for covering the speed increasing gear mechanism is provided on the upper end of the gear box housing 16.
Is attached. Further, inside the gear box housing section 16, the lubricating oil storage chamber 2 is provided from a portion where the speed increasing gear is installed.
2, a lubricating oil recovery flow path 45 is formed. The lubricating oil suction port 43 has a lubricating oil pump (not shown) mounted outside the compressor base 15.
Is connected, and the lubricating oil pump is connected to the lubricating oil storage chamber 22.
The lubricating oil sucked from the gear box housing portion 16 passes through an oil cooler (not shown) and an oil filter (not shown) attached to the outside of the compressor base 15.
The lubricating oil injected into the installation portion of the speed increasing gear mechanism, and further injected into the installation portion of the speed increasing gear mechanism, is collected in the lubricating oil storage chamber 22 through the lubricating oil recovery flow path 45. ing. The first scroll portion 17 is provided on the upper portion of the compressor base 15 so as to be located near one end A of the gear box housing portion 16 and is connected to the output shaft of the speed increasing gear mechanism. It has a scroll chamber 32 that houses an impeller (not shown). An opening cover 34 is attached to an end of the first-stage scroll portion 17 near the one end A so as to cover the opening 33 of the scroll chamber 32. 35 are provided. Further, a first-stage discharge passage 36 extending from the scroll chamber 32 to the vicinity of one end A side of the intercooler chamber 20 inside the compressor base 15 is provided inside the first-stage scroll portion 17. (The inlet 47 of the first-stage discharge passage 36 is indicated by a solid line in FIG. 4 and the outlet 48 of the first-stage discharge passage 36 is indicated by a two-dot chain line in FIG. 3). The gas that is rotated and flows into the first scroll portion 17 from the gas inlet 35 and is compressed flows through the first discharge passage 36 into the intercooler chamber 20. The second scroll portion 18 is provided on the upper portion of the compressor base 15 so as to be located near the other end B of the gear box housing portion 16 and is connected to the output shaft of the speed increasing gear mechanism. And a scroll chamber 37 in which an impeller (not shown) is mounted. An opening cover 39 is attached to an end of the second stage scroll portion 18 near the other end B side so as to cover the opening 38 of the scroll chamber 37. Further, inside the second stage scroll portion 18, a second stage suction flow passage 40 extending from the vicinity of the other end B side end of the intercooler chamber 20 inside the compressor base 15 to the scroll chamber 37. And a second-stage discharge passage 41 extending from the scroll chamber 37 to the vicinity of the end of the after-cooler chamber 21 inside the compressor base 15 from the other end B side. The entrance 49 of 40 is shown in FIG.
4 and a solid line in FIG. 4, an outlet 50 of the second-stage suction passage 40 is shown by a solid line in FIG. 4, and an inlet 51 of the second-stage discharge passage 41 is shown in FIG. The outlet 52 of the second-stage discharge passage 41 is indicated by a two-dot chain line in FIG. 3), and the impeller rotates from the second-stage suction passage 40 to the second-stage scroll 18. The gas that flows in and is compressed is supplied to the second-stage discharge channel 41.
, And flows into the aftercooler chamber 21. The motor mount 19 is provided above the compressor base 15 so as to be located near one end A of the gear box housing 16 and is connected to the input shaft of the speed increasing gear mechanism. The motor 42 is supported. Hereinafter, the operation of this embodiment will be described. When the motor 42 is operated while the heat exchange element two cooling media contained in the intercooler chamber 20 and the aftercooler chamber 21 are circulated, the rotational force of the motor 42 increases the speed inside the gearbox housing 16. The gas to be compressed is transmitted to the impellers in the scroll portions 17 and 18 via the gear mechanism, and the impellers rotate, so that the gas to be compressed is sucked into the first stage scroll portion 17 from the outside of the compressor via the gas inlet 35. Is done. The gas sucked into the first-stage scroll section 17 is compressed by the first-stage scroll section 17 and the impeller, guided to the intercooler chamber 20 through the first-stage discharge passage 36, and It is cooled by performing heat exchange with a cooling medium flowing inside the heat exchange element. Further, the gas cooled in the intercooler chamber 20 is sucked into the second scroll portion 18 by the rotation of the impeller. The gas sucked into the second-stage scroll portion 18 is compressed by the second-stage scroll portion 18 and the impeller, guided to the aftercooler chamber 21 through the second-stage discharge passage 41, and It is cooled by performing heat exchange with a cooling medium flowing inside the heat exchange element 21 and is discharged to the outside of the compressor via a gas outlet 46 provided in the aftercooler chamber 21. In the centrifugal compressor described above, the compressor base 1
5, a compressor body 14 including a gear box housing part 16, a first stage scroll part 17, and a second stage scroll part 18 are formed by integral casting. 20, a second-stage suction passage 40 extending from the intercooler chamber 20 to the second scroll section 18, and a second-stage discharge extending from the second scroll section 18 to the aftercooler chamber 21. Since the flow path 41 and the inside of the compressor main body 14 are provided inside the compressor main body 14, the pressure loss of the gas flowing through the inside of the compressor main body 14 is reduced by optimizing the shape of each of the flow paths 36, 40, 41. Can be smaller. Further, since the thickness of the member forming the gas flow path inside the compressor main body 14 is relatively large, noise during operation is reduced. Incidentally, the centrifugal compressor of the present invention is not limited to the above-described embodiment, and it is needless to say that various changes can be made without departing from the gist of the present invention. As described above, in the centrifugal compressor of the present invention, various excellent effects as described below can be obtained. (1) Compressor base and gear box housing And a first-stage discharge passage extending from the first-stage scroll section to the intercooler chamber, while forming a compressor body including a first section, a first-stage scroll section, and a second-stage scroll section by integral casting. Since a second-stage suction passage extending from the second-stage scroll portion to the second-stage scroll portion and a second-stage discharge passage extending from the second-stage scroll portion to the aftercooler chamber are provided inside the integrally cast compressor body. In addition, the pressure loss of the gas flowing inside the compressor body can be reduced by making each flow path an optimal shape. (2) Since the thickness of the member forming the gas flow path inside the compressor body is relatively large, noise during operation is reduced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing one embodiment of a centrifugal compressor of the present invention. FIG. 2 is a view taken in the direction of arrows II-II in FIG. FIG. 3 is a view taken in the direction of arrows III-III in FIG. 1; FIG. 4 is a view taken in the direction of arrows IV-IV in FIG. 2; FIG. 5 is a view taken in the direction of arrows VV in FIG. 2; FIG. 6 is a side view showing an example of a conventional centrifugal compressor. FIG. 7 is a view taken along the line VII-VII in FIG. 6; FIG. 8 is a view taken in the direction of arrows VIII-VIII in FIG. 6; [Description of Signs] 14 Compressor body 15 Compressor base 16 Gear box housing 17 First stage scroll unit 18 Second stage scroll unit 20 Intercooler room 21 Aftercooler room 36 First stage discharge passage 40 Second stage suction flow Road 41 Second stage discharge channel

──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Shinichi Ozaki 3-2-16-1 Toyosu, Koto-ku, Tokyo Ishikawa-jima-Harima Heavy Industries, Ltd. Toyosu General Office (72) Inventor Kanji Mashima Toyosu-san, Koto-ku, Tokyo 2-16, Ishikawa Shima-Harima Heavy Industries, Ltd.Toyosu Sogo Office (72) Inventor Kentaro Ito 3-2-1, Toyosu, Koto-ku, Tokyo Ishikawa Shima-Harima Heavy Industries Toyosu Sogo Co., Ltd. (56) JP-A-47-280 (JP, A) JP-A-55-35168 (JP, A) JP-A-48-93403 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F04C 18/02 311 F04C 29/02 361

Claims (1)

(57) [Claim 1] A compressor base having an intercooler chamber and an aftercooler chamber, a gear box housing section housing a speed increasing gear mechanism, and connected to the speed increasing gear mechanism. A first-stage scroll portion having an impeller therein and a second-stage scroll portion having an impeller connected to the speed increasing gear mechanism are formed by integral casting to form a compressor body; A first-stage discharge flow path that guides gas compressed in the intercooler chamber into the intercooler chamber, a second-stage suction flow path that guides gas cooled in the intercooler chamber into the second-stage scroll part, and compressed in the second-stage scroll part. Centrifugal compressor, wherein a second-stage discharge flow path for guiding the gas into the aftercooler chamber is provided inside the integrally cast compressor body.