Abstract: A suction pipe 200 of a centrifugal compressor 20, the centrifugal compressor 20 having a suction port 22 that is open to direct the working fluid to an impeller 21, the suction pipe 200 including a first opening portion 31 to be directly or indirectly connected to the suction port 22 and a second opening portion 32 positioned upstream from the first opening portion 31 in the flow direction of the working fluid. The second opening portion 32 is positioned below the first opening portion 31 in the vertical direction. The first opening portion 31 and the second opening portion 32 are open toward the same direction.

Abstract: A rotary machine 100 includes a bearing 10, a rotary shaft 20, a turbine wheel 30, a turbine nozzle 31, and a first cavity 40. The bearing 10 has a first end face 10a and a second end face 10b each positioned in the axial direction of the rotary shaft 20. The distance from the first end face 10a to the turbine wheel 30 is shorter than the distance from the second end face 10b to the turbine wheel 30. The first cavity 40 is positioned, in the axial direction of the rotary shaft 20, between a back surface 31b of the turbine nozzle 31 and the second end face 10b of the bearing 10 or between the back surface 31b of the turbine nozzle 31 and a space 11 that the second end face 10b of the bearing 10 faces. The first cavity 40 is present in the zone overlapping with the turbine nozzle 31 in a radial direction of the rotary shaft 20.

Abstract: Train monitoring equipment for a train formed by coupling a plurality of sets of cars of fixed formations, comprising monitoring stations mounted in the respective cars of the train and connected serially by transmission lines. Presetting switches are provided in the respective monitoring stations for presetting the formation numbers of the sets of cars in which the respective monitoring stations are located. One of the monitoring stations which serves as the control station transmits its formation number to the other monitoring stations which then register their station numbers on the basis of conformity or non-conformity of the preset formation numbers with the received formation numbers.

Abstract: An automatic vehicle testing apparatus in which data representing conditions of units to be controlled are transmitted through optical transmission lines between a central station and terminal stations mounted on vehicles, which may be railroad cars. The central station can be placed in an automatic test mode. A test controller installed at a test location is operated to place the central station in the test mode. A response signal generating unit for operating each of the units in the vehicles and a monitoring unit for monitoring operations thereof are connected between each terminal station and the respective unit to be controlled. The data in the automatic test mode is transmitted through the optical transmission lines.