JP2005186800A - Air-conditioner for railway vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air conditioner for a railway vehicle having a high reliable water drain system not providing any water drain mechanism using a motor like a water drain pump but providing a water drain system using compressed air. <P>SOLUTION: This air conditioner for a railway vehicle is operated such that drain water 3 discharged out of an indoor heat exchanger accumulated in a drain pan 1 is discharged out of a vehicle through a solenoid valve 8 and an ejector 7 for changing a pressure in a drain pipe 4 into a negative pressure. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an air conditioner for a railway vehicle.

  Conventionally, in an air conditioner for a railway vehicle that runs at high speed, drain water generated in the indoor heat exchanger is once received by the drain pan, and the drain water collected in the drain pan is taken outside the vehicle via the drain pump and drain pipe. Draining. And the drainage pump with which the drain pan is equipped is always operated if the power supply for enabling a rail vehicle to run becomes a live line state.

  On the other hand, a float switch is provided in the drain pan, and when the drain pump is not drained due to failure or the like, this float switch is operated, and the air conditioner is protected and stopped by its output.

  However, in such a conventional system, if the drainage pump fails, the entire air conditioner stops, and as a result, there is a problem that leads to a decrease in service to passengers.

  The present invention has been made in view of such a conventional technical problem, and is not a drainage mechanism that uses a motor like a drainage pump, but a drainage system that uses compressed air to provide highly reliable drainage. An object of the present invention is to provide an air conditioner for a railway vehicle including the system.

  The present invention also reduces the operation rate of the drainage pump by operating the operation rate at a certain time interval or changing the method of using the float switch for detecting the water level even if the drainage pump similar to the conventional one is used. It is an object of the present invention to provide a durable railway vehicle air conditioner that can extend the life of a drainage pump.

  The air conditioner for a railway vehicle of the invention of claim 1 drains drain water discharged from the indoor heat exchanger accumulated in the drain pan to the outside of the vehicle by an electromagnetic valve and an ejector for making negative pressure in the drain pipe. It is a feature.

  The air conditioner for a railway vehicle according to the invention of claim 2 drains the drain water discharged from the indoor heat exchanger accumulated in the drain pan to the outside of the vehicle based on the principle of Bernoulli's law using the air flow velocity at high speed travel. It is characterized by this.

  The air conditioner for a railway vehicle according to the invention of claim 3 includes a timer for operating the drainage pump provided in the drain pan that receives drain water discharged from the indoor heat exchanger at a certain time interval. It is a feature.

  According to a fourth aspect of the present invention, there is provided an air conditioner for a railway vehicle, wherein a drain pump provided in a drain pan that receives drain water discharged from an indoor heat exchanger is provided with drain water in the drain pan by a float switch provided in the drain pan. Only when it is detected that a certain level of water level has occurred, the vehicle is operated.

  According to the present invention, drain water discharged from the indoor heat exchanger that accumulates in the drain pan is drained out of the vehicle by the drainage system that drains it with a solenoid valve and an ejector or by the Bernoulli's law principle using the air flow velocity at high speed. By providing the drainage system for draining drain water, it is possible to drain the drain water using compressed air, and it is possible to provide a railway vehicle air conditioner equipped with a highly reliable drainage system.

  Further, according to the present invention, the drainage pump provided in the drain pan that receives drain water discharged from the indoor heat exchanger is operated at a certain time interval, or the drain pump is provided by a float switch provided in the drain pan. By operating the drainage pump only when it detects that a certain level of water level has occurred in the pan, it is possible to extend the life of the drainage pump by lowering the operation rate of the drainage pump. Can be provided.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an air conditioner for a railway vehicle according to a first embodiment of the present invention. In the railway vehicle air conditioner of this embodiment, the drain pan 1 is provided with a water level detection float switch 2 and a drain pipe 4 for pumping up drain water 3, and drains the drain water 3 to the outside. A drain pipe 4 is connected via a drain hole and a rubber hose. A pipe 5 branched from the middle of the drain pipe 4 is provided with an ejector 7 connected to an air reservoir 6 of the vehicle, and the portion beyond the branch portion is under negative pressure. A two-way valve 8 having a solenoid valve is disposed upstream of the branch portion of the drain pipe 4, and when the drain water 3 accumulates in the drain pan 1 by the cooling operation of this apparatus, the float switch 2 is pushed up to energize the solenoid valve. Accordingly, the two-way valve 8 is operated, the drain water pumping portion of the drain pipe 4 is set to a negative pressure, and drainage is performed outside the apparatus.

  When this drainage is performed for a certain period of time, the water level of the drain pan 1 falls and the float switch 2 falls, the energization of the solenoid valve stops and the two-way valve 8 operates in the reverse direction, and the drain water pumping part of the drain pipe 4 Becomes the same as the pressure in the device, and drainage stops.

  Thus, in the railway vehicle air conditioner according to the first embodiment of the present invention, without using the drainage pump provided in the drain pan 1 that receives the drain water 3 discharged from the indoor heat exchanger, By draining with the two-way valve 8 provided with the electromagnetic valve and the ejector 7, the drain water 3 of the drain pan 1 can be discharged without a drain pump, and a highly reliable drainage system can be provided.

  Next, a railcar air conditioner according to a second embodiment of the present invention will be described with reference to FIG. The drain pan 1 is provided with a drain pipe 4 for pumping the drain water 3, and the drain pipe is connected to the outside via a drain hole and a rubber hose for draining the drain water 3. The front end of the pipe 5 branched from the middle of the drain pipe 4 is disposed at a position for receiving the traveling wind 10 of the vehicle, and the part beyond the branch section 9 of the drain pipe is under negative pressure.

  In the second embodiment, if the vehicle travels at a high speed, the traveling wind 10 causes negative pressure on the front side of the branching portion 9 of the drain pipe 4, and the drain water accumulated in the drain pan 1 by the principle of Bernoulli's law. 3 is drained by the drain pipe 4 and drained outside the vehicle.

  As a result, in the second embodiment, Bernoulli's law using the traveling wind 10 of the vehicle without using the drainage pump provided in the drain pan 1 that receives the drain water 3 discharged from the indoor heat exchanger. By draining according to the principle, the drain water 3 of the drain pan 1 can be discharged, and a highly reliable drainage system can be provided.

  Next, a railcar air conditioner according to a third embodiment of the present invention will be described with reference to FIG. In the present embodiment, the drain pan 1 is provided with a drain pump 11 for pumping the drain water 3 and a drain pipe 4 for keeping the air tight, and through a drain hole and a rubber hose for draining the drain water 3 to the outside. The drain water 3 is pumped up by the drain pump 11, and the drain water is discharged to the outside. A timer 12 is provided on the power source side of the drainage pump 11, and the drainage pump 11 is operated at a certain time interval for a predetermined time.

  With this configuration, in the railway vehicle air conditioner of the present embodiment, drain water 3 is drained for a certain period of time during which the drain pump 11 is operating, and drainage is stopped otherwise. The operation time interval of the drain pump 11 is appropriately set according to the cooling capacity of the air conditioner.

  Thus, according to the third embodiment, the drainage pump 11 provided in the drain pan 1 that receives the drain water 3 discharged from the indoor heat exchanger is operated at a certain time interval to operate the drainage pump. By reducing the operation rate of 3, the life of the drainage pump 11 can be extended, and a durable railway vehicle air conditioner can be provided.

  Next, a railcar air conditioner according to a fourth embodiment of the present invention will be described with reference to FIG. The drain pan 1 detects the abnormality of the first float switch 13 for detecting the water level and the drain pump 11, that is, when the drain pump 11 breaks down, it detects that the water level of the drain pan 1 rises and protects the air conditioner. Therefore, a second float switch 14 for stopping the cooling operation is arranged. A drainage pump 11 for pumping the drain water 3 and a drain pipe 4 for keeping airtightness are connected to a drain hole for draining the drain water 3 to the outside through a rubber hose.

  In the railway vehicle air conditioner according to the fourth embodiment, when the drain water 3 accumulates in the drain pan 1 by cooling, the first float switch 13 for detecting the water level is pushed up, and the drain pump 4 is energized to drain the water. Done. When drainage is performed for a certain time, the water level of the drain pan 1 is lowered, and the first float switch 13 for detecting the water level is lowered, the energization of the drainage pump 4 is stopped and the drainage is stopped. If the drain pump 1 fails to drain the drain pan 1 and the water level pushes up the second float switch 14, the operation signal of the second float switch 14 is used for cooling operation to protect the air conditioner. Is output as a signal to stop.

  Thus, in the railway vehicle air conditioner of the fourth embodiment, the drainage pump is used only when the water level of the drain water 3 in the drain pan 1 is generated to some extent by the float switch 13 provided in the drain pan 1. By operating 11, the drainage pump 11 can be extended in life by lowering the operation rate of the drainage pump 11, and a durable railway vehicle air conditioner can be provided.

Explanatory drawing of the 1st Embodiment of this invention. Explanatory drawing of the 2nd Embodiment of this invention. Explanatory drawing of the 3rd Embodiment of this invention. Explanatory drawing of the 4th Embodiment of this invention.

Explanation of symbols

1 Drain pan 2 Float switch 3 Drain water 4 Drain pipe 5 Piping 7 Ejector 10 Running air 11 Drain pump 12 Timer 13 First float switch 14 Second float switch

Claims (4)

  An air conditioner for a railway vehicle, characterized in that drain water discharged from an indoor heat exchanger that accumulates in a drain pan is drained outside the vehicle by an electromagnetic valve and an ejector for making the inside of a drain pipe have a negative pressure.   An air conditioner for a railway vehicle characterized in that drain water discharged from an indoor heat exchanger that accumulates in a drain pan is drained to the outside of the vehicle based on the principle of Bernoulli's law using the air flow velocity during high-speed traveling.   An air conditioner for a railway vehicle, comprising a timer for operating a drain pump installed in a drain pan that receives drain water discharged from an indoor heat exchanger at a certain time interval. The drainage pump installed in the drain pan that receives the drain water discharged from the indoor heat exchanger is operated only when it is detected that the drain water level in the drain pan has been generated to some extent by the float switch provided in the drain pan. An air conditioner for a railway vehicle, characterized in that:

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