JPH0451086Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial field of application] This invention relates to a water supply system for railway vehicles, and particularly uses an electric pump as a power source.

[Conventional technology]

As a water supply system for railway vehicles, water is conventionally supplied from the ground to a water tank via a mechanical water/air supply switching valve (automatic five-way valve), and when the water is full, the valve is switched to shut off the water supply pipe and the water is compressed into the water tank. Air is supplied and the pressure used to provide water supply services. Note that this water tank varies depending on the vehicle structure, and may be placed on the floor, but generally it is installed under the floor and distributes water to customer service facilities such as toilets and washrooms. In this case, compressed air for the vehicle's brakes is depressurized and then pressurized and distributed to the water tank, and a mechanical air supply and water supply switching valve is used to supply water from the ground to the water tank. Because of this, there were many failures, and rust and dust inside the piping caused the switching valve to malfunction, causing problems in terms of service. Furthermore, since the entire water tank is pressurized with air supply (normal pressure is about 1 kg/cm ² ), the water tank had to be used as an internal pressure vessel. As described above, in the past, a large number of valves and a water tank as an internal pressure vessel are used, which causes troubles and maintenance problems, and also increases the cost of the entire device. Fig. 2 is a typical system diagram of a water supply system for a railway vehicle that has been used conventionally, in which 9 is a chilli, 10 is an auxiliary air reservoir, 11 is a check valve, 12 is a pressure reducing valve, 13 is a safety valve, 14 15 is a drain valve, 15 is a water/air supply switching valve, and 16 is a water tank. Water is supplied from the ground to the water tank through the water supply and air switching valve 15, and the water and air switching valve 15 is switched so that pressurized air from the outside is supplied to the water tank 9, check valve 11, pressure reducing valve 12, safety valve 13, and drain valve. Water supply service is provided to the water in the water tank 16 through each of the 14 valves and the water/air supply switching valve 15.

[Problem that the invention attempts to solve]

However, this type of water supply device using pressurized supply air that has been used in the past has problems such as being troublesome to maintain and frequently breaking down, and improvements are desired.

However, as long as the current method is used, many devices such as supply air pressurization switching valves are required to be used in the device, and it is thought that there is a limit to the improvement of the problem.

[Means for solving problems]

Considering the various shortcomings of the conventional water supply system for railway vehicles, the inventor of the present invention, after repeated prototyping and experiments, stopped using a mechanical air supply water supply switching valve and replaced it with an electric one. By adopting an automatic water supply pump, the electric water pump can be automatically operated to automate water supply and distribution operations, and it also eliminates the use of compressed air from the vehicle, which prevents the occurrence of breakdowns that occur with conventional water supply systems. This is how it was done.

[Effect]

In this way, this invention includes a water tank 1 for storing water supplied from the ground, an electric water pump 3, a pressure water tank 4, a pressure sensor 7 for constant pressure control, and a controller 6 for automatically controlling the motor of the electric water pump 3. As a result, only the amount of water required for water supply is pressurized and stored in the pressure water tank 4, making it possible to provide water supply service with a small capacity pressure water tank.

〔Example〕

FIG. 1 is a system diagram of an embodiment of the water supply device according to this invention, where 1 is a water tank and 2 is a check valve. 3 is an electric water pump, 4 is a pressure water tank, 5 is a pressure sensor, 6 is a controller, and 7 is a water level sensor.
Further, 8 is an electric shutoff valve which is controlled by a signal from the water level sensor 7 and can automatically shut off the water supply from the ground. Further, 8' is a pressure sensor for detecting the water supply pressure from the ground.

The water thus stored in the water tank 1 is pumped up by the electric water pump 3 and sent under pressure to the pressure water tank 4. In this case, the pressure in the pressure water tank 4 is detected by a pressure sensor 5, and the controller 6 controls the motor of the electric water pump 3 to control the water supply pressure within a certain range to provide stable water supply service.

[Effect of idea]

In this way, in the past, a large pressure tank of about 1000 was required to pressurize the entire water tank 16, but in this invention, only the amount of water necessary for supplying water is pressurized and stored in the pressure water tank 4. Water supply services can be provided using a pressurized water tank with a small capacity. Further, since pressurization is not performed by pressurized air as in the conventional case, mechanical valves such as the chilicosi 9, the pressure reducing valve 12, and the air/water supply switching valve 15 are not required.

Therefore, with the device according to this invention, the reliability of the entire device has been greatly improved, and it has become possible to save labor and reduce costs for maintenance.

[Brief explanation of drawings]

FIG. 1 is a system diagram of an embodiment of the water supply system for railway vehicles according to this invention, and FIG. 2 is a system diagram of a conventional water supply system. In the figure, 1 is a water tank, 2 is a check valve, 3 is an electric water pump, 4 is a pressure water tank, 5 is a pressure sensor, 6
is a controller, 7 is a water level sensor, 8 is an electric shut-off valve, and 8' is a pressure sensor.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An atmospheric pressure water tank 1 for storing water, a pressure water tank 4 for providing water supply service, and an electric motor that sends water from the water tank 1 to the pressure water tank 4 through the check valve 2. The electric water pump 3 is automatically controlled by comprising a water pump 3, a pressure sensor 5 that detects the pressure of the pressure water tank 4, and a control 6 that controls the motor of the electric water pump 3 by detecting the pressure of the pressure water tank. A water supply system for railway vehicles that provides water supply services by controlling the water supply pressure within a certain range. (2) The water supply system for a railway vehicle according to claim 1, wherein the water supply from the ground to the water tank 1 is shut off using an electric shutoff valve 8 in response to a signal from a water level sensor 7.