JPH0262318A - Method of reducing pressure in pipeline of high-speed transport system - Google Patents

Abstract

PURPOSE:To simplify the constitution and to reduce the pressure reducing efficiency by providing an exhauster on the arrival side, thereby drawing off compressed air generated in running of a vehicle in the above system for transporting the vehicle in a pipeline. CONSTITUTION:When a vehicle 4 is travelled from the start side to the arrival side, as it approaches the arrival side, the pressure in the pipeline 1 on the arrival side increases. At this time, an exhauster 5 is operated and a valve 6 is opened to discharge air in the pipeline 1, so that the pressure is reduced. By this arrangement, the pressure can be reduced efficiently in a simple constitution.

Description

DETAILED DESCRIPTION OF THE INVENTION (a) Industrial Application The present invention relates to a method for depressurizing a pipeline in a high-speed transportation system in which vehicles run at high speed within the pipeline.

(B) Prior art In recent years, high-speed transportation has been developed to transport materials or people using long-distance pipelines as guideways and by means of moving vehicles that mainly use their own power or external power such as linear motors to travel at high speeds. systems have been researched and developed. In order to reduce running resistance, there is a need for a method for reducing the pressure in the guideway.

Conventionally, in order to depressurize a long-distance pipeline, as shown in Figure 2, both ends of pipe #11 are sealed with shutters 2, etc., and exhaust floors or exhaust devices such as vacuum pumps are installed at appropriate intervals. 3 to exhaust the air in the pipe line 1 is generally adopted, but this method has the following problems. .

(2) The air between the exhaust devices 3 gathers in the vicinity of the exhaust W3 due to the pressure gradient of the air generated when the pressure is reduced in the vicinity of the device 3, but since the speed is extremely low, it takes a long time to reduce the pressure.

- It is necessary to arrange a large number of exhaust devices t3 along the entire long-distance pipe #t1, which not only increases the installation cost but also increases the cost of laying power supply, control cables, etc.

(c) Problems to be Solved by the Invention The problem to be solved by the present invention is to obtain a method for efficiently depressurizing the g-way in a high-speed transportation system at low cost.

(d) Means for Solving the Problems The method for depressurizing a pipeline according to the present invention is to provide an exhaust system on the arrival side of the pipeline in a high-speed transportation system in which vehicles run at high speed in the pipeline. The above-mentioned problem is solved by means of driving a vehicle from the side toward the arrival side and exhausting air compressed by the vehicle to the outside of the pipe by the exhaust device.

(e) Effect In the method of the present invention, a vehicle is run from the departure side toward the arrival side with the departure side of the conduit being almost cut off from outside air, and the air that has moved toward the arrival side is transferred to the arrival side. The pressure inside the pipe is reduced by exhausting it outside the pipe using an exhaust device connected to the pipe.

(F) Embodiment An embodiment of the pipe-based pressure reduction method of the present invention will be described with reference to FIG.

In a general high-speed transportation system 10, vehicles 4 travel at high speed within a conduit 1 using their own power or external power such as a linear motor.

In order to reduce the air resistance inside the pipe 8@1 when the vehicle 4 runs, in the present invention, the departure side and the arrival side of the pipe #11 are sealed with shutters 2, and the exhaust is placed on the arrival side of the pipe #11. Device! j5 is provided, the vehicle 4 is run from the departure side to the arrival side of the conduit, and the air compressed by the vehicle 4 is exhausted to the outside of the conduit 1 by the exhaust device 5.

As the exhaust system w5, a conventional exhaust blower or a vacuum pump may be used. When the pressure on the arriving side becomes higher than the outside air due to the running of the vehicle, the air is quickly exhausted by opening the valve 6. The sealing by the shutter 2 does not necessarily have to be performed strictly.

When the vehicle 4 is driven from the departure side toward the arrival side under the above-described configuration, the air within the conduit 1 moves toward the arrival side. As the vehicle 4 approaches the arrival side, the pressure in the arrival pipe I#11 increases - so the arrival pipe 1
When the air inside the pipe 1181 is exhausted by the exhaust system W5 connected to the exhaust system W5, the air can be efficiently exhausted because the pressure in the vicinity thereof has increased. Further, by providing a valve 6 on the arrival (F+) and opening this valve 6 when the pressure inside the pipe on the arrival side becomes higher than the atmosphere, efficient exhaust can be achieved.

The severity of the drive system is mainly determined based on the steady state (vehicle running at the design speed with the pipe line depressurized to a predetermined pressure), so the vehicle speed remains at the design speed until depressurization is completed. The vehicle speed is often not reached, i.e. the vehicle is initially driven at a relatively low speed to exhaust the air, and as the line is depressurized the vehicle speed is increased. By repeating the vehicle drive several times, the pressure inside the pipe is reduced to a predetermined pressure.

Next, a specific example of the method of the present invention will be described in comparison with a conventional method.

■ Pipeline: Cross-sectional area 3M, length 500km, ■
Vehicle: Cross-sectional area 1.9M, weight 51 tons, propulsion force 5 tons, fi high speed 500 kl/hour, departs every 5 minutes, ■ Required degree of vacuum (pressure inside the pipe after exhaust): +r to 100
/rd abs (0,01kg/aJ ab
s)■ Implementation results: Exhaust blower capacity (13/lin) and exhaust time required (n
Figure 3 shows the relationship between According to the method, it only takes about 3 hours, which is about 1/12th of the time. Furthermore, in the case of the 30013/lin exhaust blower, this effect is even more apparent. While the conventional method requires 16 days, the method of the present invention requires less than 5 hours, which is only about 1/80th of that time.

The conventional method requires two days even if a large-scale exhaust blower of 3000 n'/nin is used, whereas the method of the present invention can exhaust the air in 1/8 of the time using a 1/10 blower. In addition, the conventional method requires 240,000nf to exhaust in 5 hours.
/ nin huge scale exhaust blower group is required. Furthermore, according to the method of the present invention, about 40 trains will run during this period, and it is also possible to make this a part of commercial (transport) operation.

(g) Effects According to the method of the present invention, the compressed air is discharged to the arrival side, so the exhaust efficiency is greatly improved, and depressurization can be performed even while the vehicle is in motion, reducing the overall cost. You can achieve down.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of the pipe-based pressure reduction method of the present invention. FIG. 2 is an explanatory diagram of a conventional pipe-based pressure reduction method, and FIG. 3 is a graph showing the results of implementing the present invention. 1: Pipeline 2: Shutter 3.5: Exhaust system 4: Vehicle 6: Valve patent applicant Takenaka Corporation Co., Ltd. Sumitomo Metal Industries Co., Ltd.

Claims (1)

[Claims] In a high-speed transportation system in which vehicles run at high speed in a conduit, an exhaust device is installed on the arrival side of the conduit, and the vehicle is run from the departure side of the conduit to the arrival side, and the air compressed by the vehicle is discharged from the A method for reducing pressure inside a pipeline for a high-speed transportation system, which is characterized by exhausting the air outside the pipeline using an exhaust device.