JPH0614498U - Centrifugal compressor - Google Patents

Abstract

(57) [Summary] [Purpose] The objective is to reduce the overall required space, reduce the number of members such as pipes and scrolls, and shorten the flow path that guides the working fluid from the impeller at the front stage to the impeller at the rear stage. [Composition] Connected in the middle of the flow path for guiding the working fluid from the former impeller to the latter impeller in the vicinity of the outer periphery of the rotating shaft in the centrifugal compressor that cools the working fluid guided from the former impeller to the latter impeller by the intercooler. The inside of the formed cylindrical container is partially partitioned by a partition plate, and an intercooler is provided in the U-shaped flow path.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal compressor applied to compression and feeding of various gases. In addition, the centrifugal compressor in this specification includes a centrifugal blower.

[0002]

[Prior art]

 FIG. 2 is an explanatory diagram of a conventional four-stage centrifugal compressor that is applied to compress and send various gases. In the figure, the present centrifugal compressor is designed so that intercooling is performed between each stage. In the figure, reference numeral 011 is a first stage compressor, 012 is a second stage compressor, 013 is a third stage compressor, and 014 is a second stage compressor. 4 stage compressor, 021 1st stage intercooler, 022 2nd stage intercooler, 023 3rd stage intercooler, 031 1st stage discharge pipeline, 032 2nd stage discharge pipeline, 033 is the third stage discharge pipe line, 041 is the first stage suction pipe line, 042 is the second stage suction pipe line, 043 is the third stage suction pipe line, 044 is the fourth stage suction pipe line, and 050 is the speed increasing gear. Reference numeral 060 denotes a driving motor.

[0003]

[Problems to be solved by the device]

 In the conventional centrifugal compressor as described above, the high-pressure gas discharged from the outlets of the respective stage compressors 011, 012, 013 is separately placed on the floor through the scroll and the respective stage discharge lines 031, 032, 033. Are cooled by heat exchange in each of the column-shaped intermediate coolers 021, 022, 023, and again pass through the suction pipe lines 042, 043, 044 of the respective stages and the scrolls to the compressors 012, 013 of the next stage. Since the intercoolers 021, 022, 023 for each stage are separately placed on the floor, the overall required space is large, and the number of members such as pipelines and scrolls increases, and The flow path for guiding the working fluid from each stage compressor 011, 012, 013 to the next stage compressor 012, 013, 014 becomes longer, and the pressure in the flow path is increased. Loss is larger.

[0004]

[Means for Solving the Problems]

 The centrifugal compressor according to the present invention is intended to solve the above-mentioned problems, and in a centrifugal compressor in which a working fluid guided from an impeller at a front stage to an impeller at a rear stage is cooled by an intercooler, a centrifugal compressor is provided in the vicinity of an outer periphery of a rotating shaft. A tubular container is connected in the middle of the flow path that guides the working fluid from the preceding impeller to the latter impeller, and the inside of the cylindrical container is partially partitioned by a partition plate to form a U-shaped flow path. The intercooler is provided in the flow path.

[0005]

[Action]

 That is, in the centrifugal compressor according to the present invention, from the impeller of the former stage to the impeller of the latter stage in the vicinity of the outer circumference of the rotating shaft in the centrifugal compressor in which the working fluid guided from the impeller of the former stage to the impeller of the latter stage is cooled by the intercooler. An intermediate cooler is provided in a U-shaped flow path formed by partitioning the inside of a cylindrical container connected in the middle of the flow path for guiding the working fluid. Is a cylindrical container provided in the vicinity of the outer circumference of the rotary shaft of the centrifugal compressor, and is divided into a U shape by a partition plate to form an inner peripheral side flow path and an outer peripheral side flow path to provide an intercooler. As a result, the overall required space is small, and the number of components such as pipes and scrolls is reduced, and the flow path that guides the working fluid from the impeller in the previous stage to the impeller in the subsequent stage is shortened.

[0006]

【Example】

 FIG. 1 is an explanatory diagram of a two-stage centrifugal compressor according to an embodiment of the present invention. In the figure, the centrifugal compressor according to the present embodiment is used for compression and air supply of various machine bodies, and intermediate cooling is performed between each stage. Reference numeral 10 in the figure indicates the main centrifugal compression Machine inlet, 11 shroud case, 12 stay, 13 first stage impeller, 14 first stage diffuser, 21 thrust bearing, 22 journal bearing, 40 rotary shaft, 50 intercooler, 51 Is an inner flow passage, 52 is an inner cooler, 53 is an outer flow passage, 54 is an outer cooler, 55 is a double cylindrical container, 61 is a return bend, 62 is a second stage impeller, and 63 is a third A two-stage diffuser, 64 is a second stage scroll, 52a is a fin, 52b is a tube, 56 is a lower cylinder, 57 is a partition plate, and 58 is an upper cylinder.

In the present centrifugal compressor, if the intercooler is separately installed like the conventional centrifugal compressor to perform the intercooling, the overall required space is large, and the space for the pipe line, the scroll, etc. is large. As the number of members increases, the flow path becomes longer and the pressure loss in the flow path becomes larger. Therefore, as shown in the figure, the intercooler 50 is a double cylinder with the outer circumference of the rotary shaft 40 of the present centrifugal compressor. It is contained in a container 55. The inside of the double cylindrical container 55 is partially divided into an inner peripheral side flow passage 51 and an outer peripheral side flow passage 53 by a partition plate 57 to form a U-shaped flow passage, and the working fluid is transferred to the first stage impeller. It is provided in the middle of the flow path from 13 to the second stage impeller 62, and the working fluid enters from one end of the inner peripheral side flow path 51 to bypass the partition plate 57 and enters the outer peripheral side flow path 53 to enter the other end. Is coming out from. Further, a plurality of tubes 52b for flowing the refrigerant in the circumferential direction are arranged in the inner peripheral side flow passage 51 and the outer peripheral side flow passage 53 in the double cylindrical container 55, and a large number of fins 52a are arranged on the outer periphery of the tube 52b. Is installed.

The gas flowing from the inlet 10 of the centrifugal compressor passes through the flow path formed by the shroud case 11 and the stay 12 and is boosted and accelerated by the first stage impeller 13 and then decelerated by the diffuser 14. The pressure is increased and flows into the inner circumferential side passage 51. The gas flowing into the inner peripheral side flow passage 51 is cooled through the inner cooler 52, bypasses the partition plate 57 in a U-shape, and then further cooled through the outer cooler 54, and the outer flow passage 53. Through it and flows into the return bend 61. Then, the pressure is increased and accelerated by the second-stage impeller 62, decelerated and increased by the second-stage diffuser 63, flows into the second-stage scroll 64, and is discharged from the outlet of the second-stage scroll 64. Generally, the required power in the centrifugal compressor is proportional to the absolute temperature of the working fluid at the inlet, but the required power is reduced by cooling the high-pressure gas with the intercooler 50. In the centrifugal compressor in which the high pressure gas is cooled by the intercooler 50 to reduce the required power as described above, the inside of the double cylindrical container 55 provided on the outer circumference of the rotary shaft 40 is divided into inner and outer circumferences by the partition plate 57. By forming the inner peripheral side flow passages 51 and 53 in a letter shape and providing the inner cooler 52 and the outer cooler 54 in the inner peripheral side flow passages 51 and 53, respectively, the first stage The flow path for introducing high-pressure gas from the impeller 13 to the second-stage impeller 62 is shortened to reduce the pressure loss in the flow path, the connection from the first-stage impeller 13 to the second-stage impeller 62 is facilitated, and the refrigerant flow The intercooler 50 can be made compact by simplifying the passage, and the multistage centrifugal compressor can be made compact as a whole.

[0009]

[Effect of device]

 The centrifugal compressor according to the present invention is configured as described above, and since the flow passage for introducing the working fluid from the impeller at the front stage to the impeller at the rear stage becomes short, the pressure loss in the flow passage becomes small.

[Brief description of drawings]

FIG. 1 (a) is a sectional view of a two-stage centrifugal compressor according to an embodiment of the present invention, and FIG. 1 (b) is a perspective view of an intercooler thereof.

2 (a) is a plan view of a conventional four-stage centrifugal compressor, FIG. 2 (b) is a bb arrow view in FIG. 2 (a), and FIG. 2 (c) is cc. FIG.

[Explanation of symbols]

 11 Shroud Case 12 Stay 13 First Stage Impeller 14 First Stage Diffuser 21 Thrust Bearing 22 Journal Bearing 40 Rotating Shaft 50 Intercooler 51 Inner Circumferential Side Flow Channel 52 Inner Cooler 53 Outer Circumferential Side Flow Channel 54 Outer Cooler 55 Duplex Cylindrical container 61 Return bend 62 Second stage impeller 63 Second stage diffuser 64 Second stage scroll 52a Fin 52b Tube 56 Lower cylinder 57 Partition plate 58 Upper cylinder

Claims (1)

[Scope of utility model registration request] 1. A centrifugal compressor for cooling a working fluid guided from an impeller of a preceding stage to an impeller of a succeeding stage by an intercooler, a flow of guiding the working fluid from said impeller of said preceding stage to said impeller of said latter stage in the vicinity of the outer periphery of a rotating shaft. A tubular container is connected in the middle of the passage, the inside of the tubular container is partially partitioned by a partition plate to form a U-shaped passage, and the intercooler is provided in the passage. Centrifugal compressor.