JPH037245Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a cleaning liquid jetting device in which the jetting and stopping of cleaning liquid from a cleaning liquid nozzle installed in a window cleaning machine for a railway vehicle, etc. is controlled by an operating valve. .

[Conventional technology]

Conventionally, as shown in FIG. 7, one example of this type of cleaning liquid ejecting device has separate cleaning liquid nozzles 1 corresponding to both the driver's seat side and the passenger seat side.
a, 1b, a three-position, three-port multi-position directional switching valve as shown in the figure was used as the operating valve 2. A first outlet-side cleaning liquid supply pipe 3 is connected to the two output ports Wa and Wb of the operation valve 2, respectively, to the cleaning liquid nozzle 1a on the driver's seat side.
a, and a second one leading to the cleaning liquid nozzle 1b on the passenger seat side.
The outlet side cleaning liquid supply pipe 3b is connected to the outlet side cleaning liquid supply pipe 3b, while the inlet side cleaning liquid supply pipe 3 common to these
It is arranged across the input port F of the operation valve 2 and the cleaning liquid tank 4. The cleaning liquid tank 4 is also supplied with an air pipe 8 having a pressure-controlled pressure reducing valve 7 from a pressure air source 6 that is common to both the driver's side and passenger's side window cleaning machine drive units 5a and 5b. , the compressed air is supplied only when it is possible to supply pressurized air to the drive devices 5a and 5b.

According to this, the second outlet side cleaning liquid supply pipe 3
When the operating valve 2 is switched to the position where only b is shut off, the cleaning liquid remains sealed inside. Further, the operation valve 2 is located at a position where all of the first outlet side cleaning liquid supply line 3a, the second outlet side cleaning liquid supply line 3b, and the inlet side cleaning liquid supply line 3 are shut off.
When they are switched, the cleaning liquid remains sealed inside them. In this case, even if the pressure reducing valve 7 is shut off and the internal pressure of the cleaning liquid tank 4 becomes 0 kg/cm ² , the cleaning liquid inside the inlet side cleaning liquid supply pipe 3 is kept under vacuum, so it cannot return to the cleaning liquid tank 4. There isn't.

[The problem that the idea aims to solve]

For example, if cleaning liquid is sealed in the inlet-side cleaning liquid supply pipe 3 or the outlet-side cleaning liquid supply pipes 3a and 3b, even in the winter, if the vehicle is being operated, problems may occur due to the effect of heating inside the vehicle. Although this does not occur, when the vehicle is left unattended in the winter, even if the cleaning liquid has a low freezing temperature, the pipes 3, 3a,
3b may freeze inside, so
There are drawbacks such as pipe cracking and the inability to immediately resupply the cleaning liquid. In particular, as is well known, the strength of the piping system forming these pipe lines 3, 3a, and 3b is extremely weak, and therefore the pipe cracks are likely to occur.

Therefore, as a measure to prevent the cleaning liquid from freezing, it is conceivable to install a heater in the piping system of each conduit, or to install a pump or the like to discharge the cleaning liquid in each conduit. However, due to the installation positions of the cleaning liquid tank 4, operating valve 2, etc., these means require long piping systems, so the heaters, pumps, etc. must have a large capacity, which increases the size of the equipment and increases the cost of these heaters and pumps. Wiring for the pump, etc. is also required separately, which increases costs and makes it difficult to realize. Also, before stopping the operation of the vehicle, the cleaning liquid in the cleaning liquid tank 4 is poured into each cleaning liquid nozzle 1a,
It is also possible to drain the entire amount from 1b, but in this case, not only would it be necessary to fill the cleaning liquid tank 4 each time the vehicle is restarted, but in general, the cleaning liquid tank 4 would be too small for practical purposes. Because it is quite large due to the demands of
It takes a long time to discharge the entire amount, which is impractical.

This invention was made in order to improve such conventional drawbacks, and the cleaning liquid inside the cleaning liquid supply pipe can be discharged from the cleaning liquid nozzle by simply switching and controlling the operating valve without installing the heater or pump. It is an object of the present invention to provide a cleaning liquid ejecting device that can prevent the cleaning liquid from freezing in the pipeline and pipe cracking caused by the freezing of the cleaning liquid by returning the cleaning liquid to the cleaning liquid tank.

[Means for Solving the Problem] The means for solving this technical problem includes a pressure air source, a cleaning liquid tank connected to the pressure air source through an air pipe, and a cleaning liquid tank attached to a window cleaner of a vehicle. a cleaning liquid nozzle, an input port connected to an inlet side cleaning liquid supply line from the cleaning liquid tank, and an output port connected to an outlet side cleaning liquid supply line leading to the cleaning liquid nozzle, and communicating and connecting these two ports. In a cleaning liquid ejecting device for a vehicle window cleaner, which is equipped with a control valve that can be shut off, another new input port is provided to the control valve to connect an air branch pipe branched from an air pipe line. In this case, when the input port and the output port are cut off, the new input port is configured to freely communicate with the input port and the output port.

[Effect]

Since the present invention is configured as described above, the cleaning liquid in the cleaning liquid tank is supplied to the cleaning liquid nozzle by the pressure from the pressure air source through the cleaning liquid supply pipe on the inlet side, the operating valve 2, and the cleaning liquid supply pipe on the outlet side. When the air branch is closed, the air branch is shut off by the operating valve, but when the cleaning liquid supply is cut off by operating the operating valve, the air branch and the inlet-side cleaning liquid supply pipe or the outlet-side cleaning liquid supply pipe are closed. Since the pipes are in communication with the cleaning liquid supply pipes, pressurized air from the pressurized air source enters these cleaning liquid supply pipes, and the cleaning water remaining inside is returned to the cleaning liquid tank or discharged to the outside from the cleaning liquid nozzle. Therefore, freezing within the cleaning liquid supply pipe line and pipe cracking caused by this can be prevented.

〔Example〕

Hereinafter, one embodiment to which the present invention is applied will be described in detail based on the drawings.

In FIG. 1, the cleaning liquid tank 4 includes a window cleaning machine drive device 5a, similar to that of the conventional example described above.
When pressurized air is supplied to the drive device 5a from the pressure air source 6, which is the operating source, through the air conduit 8 equipped with the pressure reducing valve 7, the pressure air for generating the cleaning liquid jetting pressure passes through the pressure reducing valve. Air is supplied through 7. Further, as the operation valve 2, a multi-position directional switching valve with 4 positions and 3 ports is employed.

That is, as is clear from the illustration, the operating valve 2 includes an input port F for jetting cleaning liquid, an input port IA for supplying pressurized air, and an output port Wa for jetting cleaning liquid, and also has an input port F for jetting cleaning liquid. A cleaning liquid ejection position A that communicates only the output port Wa, a cleaning liquid stop position B that blocks all three ports F, Wa, and IA, and an output port Wa that connects the input port IA for pressurized air supply to the output port Wa for cleaning liquid ejection.
and a cleaning liquid return position D that connects input port IA for pressurized air supply to input port F for jetting cleaning liquid, and switching between these positions A, B, C, and D. is now possible. The inlet side cleaning liquid supply pipe line 3 from the cleaning liquid tank 4 is connected to the input port F for cleaning liquid jetting, and the output port Wa for cleaning liquid jetting.
An outlet-side cleaning liquid supply pipe 3a leading to the cleaning liquid nozzle 1a is connected to the cleaning liquid nozzle 1a, and an air branch pipe 9 branched from the air pipe 8 is further connected to an input port IA for supplying pressurized air.

In the above, when the operation valve 2 is switched to the A position, the cleaning liquid in the cleaning liquid tank 4 is force-fed from the inlet side cleaning liquid supply line 3 through the outlet side cleaning liquid supply line 3a, and is ejected from the cleaning liquid nozzle 1a. Furthermore, at position B, the inlet side cleaning liquid supply pipe 3 and the outlet side cleaning liquid supply pipe 3a are cut off, so the cleaning liquid is not jetted out, and the cleaning liquid is sealed inside these pipes 3, 3a. Furthermore, at this B position, the input port IA for supplying pressurized air is also shut off. Next, when the switch is made to position C, the air from the air branch line 9 flows into the cleaning liquid nozzle 1a through the outlet side cleaning liquid supply line 3a, so that the cleaning liquid sealed inside the nozzle is turned into a cleaning liquid by air pressure. It is pushed out and discharged from the nozzle 1a. At this time,
The cleaning liquid remains sealed in the cleaning liquid supply pipe 3 on the inlet side. Subsequently, when the switch is switched to the D position, the outlet side cleaning liquid supply pipe 3a is shut off, while air from the air branch line 9 flows into the inlet side cleaning liquid supply pipe 3. At this time, the inside of the cleaning liquid tank 4 is pressurized by the pressure air reduced by the pressure reducing valve 7 from the air pipe line 8, but according to Pascal's principle, the cleaning liquid tank 4 is sealed in the cleaning liquid supply line 3 on the inlet side. The cleaning liquid that was in the tank 4 is pushed back into the cleaning liquid tank 4 until it reaches the same level as the cleaning liquid level. 2 and 3 show the specific structure of the operating valve 2. As shown in FIG. That is, by rotating the knob 2a in the forward and reverse directions, the rotary valve 2
The circumferential long holes 10a and 10b provided in b,
It is designed to overlap one output port Wa and two input ports F and IA provided on the fixed valve 2c. FIG. 4 shows the specific switching state of the operating valve 2, in which the figure a shows the A position explained in Fig. 1, the figure b shows the same B position, and the figure c shows the same C position. In the figure, output port Wa and input port IA are on the main body (fixed) side, and input port F and slotted holes 10a and 10b are located on the main body (fixed) side.
is provided on the rotary valve 2b side.

FIG. 5 shows another embodiment. This embodiment differs from the one in FIG. 1 in that window cleaners are provided on both the driver's seat side and the passenger seat side, and cleaning liquid nozzles 1a and 1b are attached to these, respectively. The operating valve 2 is a multi-position directional switching valve with 6 positions and 4 ports.
That is, as is clear from the illustration, the two output ports Wa and Wb of the operating valve 2 are connected to a first outlet side cleaning liquid supply pipe 3a leading to the cleaning liquid nozzle 1a on the driver's seat side, and a cleaning liquid supply line 3a on the passenger side. Nozzle 1
A second outlet-side cleaning liquid supply pipe 3b leading to the cleaning liquid supply pipe 3b is connected thereto. In addition, the cleaning liquid jetting positions A include a dual jetting position A1 where the input port F for cleaning fluid jetting is communicated with both of the two output ports Wa and Wb, and a single jetting position A2 where the cleaning fluid jetting input port F is connected only to the output port Wa on the driver's seat side. Further, as a cleaning liquid discharge position C, a first one-side discharge position C1 communicates the input port IA for supplying pressurized air only to the output port Wa on the driver's seat side, and a first one side discharge position C1 communicates only with the output port Wb on the passenger seat side. A second one-side discharge position C2 is provided for communication. The rest of the structure is the same as that explained in FIG. 1, and the operation is also the same, so the same reference numerals are given to the same components as those in the same figure, and their explanations will be explained below. Omitted.

FIG. 6 shows a modification of the operating valve 2. This operation valve 2 is a multi-position directional switching valve with 5 positions and 4 ports, and has a first one-side discharge position C1 and a second one-side discharge position C in the operation valve 2 explained in FIG.
By combining 2 and 2 in one position, the input port IA for pressurized air jetting is connected to both the output port Wa for jetting cleaning liquid on the driver's side and the output port Wb for jetting cleaning liquid on the passenger side. Position C
3. Since the other points are the same as the operating valve 2 described in FIG. 5, corresponding elements are given the same reference numerals and their explanation will be omitted.

[Effect of idea]

As described above, in the present invention, the operating valve is provided with a discharge position and a return position that communicate the pressurized air source with the cleaning liquid supply pipes on the inlet and outlet sides. When switched, pressurized air is continuously supplied into the cleaning liquid supply pipe, allowing the cleaning liquid to be reliably discharged from the cleaning liquid nozzle or returned to the cleaning liquid tank, and preventing the cleaning liquid from freezing in the cleaning liquid supply pipe. It is. Furthermore, since the present invention does not require a separate heater, pump, etc., it is possible to provide a cleaning liquid ejecting device of approximately the same size as the conventional device at a low cost.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of the present invention, Fig. 2 is a front view of the operating valve, Fig. 3 is a vertical side view of the operating valve, and Fig. 4 is a schematic diagram of the embodiment of the present invention.
5 is a circuit diagram of another embodiment, FIG. 6 is an explanatory diagram showing a modified example of the operating valve, and FIG. 7 is a circuit diagram of a conventional example. 1a, 1b...Cleaning liquid nozzle, 2...Operation valve,
3...Inlet side cleaning liquid supply pipe line, 3a, 3b...Outlet side cleaning liquid supply line, 4...Cleaning liquid tank, 8...
...Air pipe line, 9...Air branch pipe line, F...Input port for squirting cleaning liquid, Wa, Wb...Output port for squirting cleaning liquid, IA...Input port for supplying pressurized air, C...Cleaning liquid Discharging position, C1...First one-sided discharging position, C2...Second one-sided discharging position, C
3...Both discharge position, D...Cleaning liquid return position.

Claims (1)

[Claims for Utility Model Registration] A pressurized air source, a cleaning liquid tank connected to the pressurized air source through an air pipe, a cleaning liquid nozzle attached to a vehicle window cleaner, and an inlet side cleaning liquid from the cleaning liquid tank. an input port connected to a supply pipe line and an output port connected to an outlet-side cleaning liquid supply line leading to the cleaning liquid nozzle;
In the washing liquid ejecting device for a vehicle window cleaner, which is equipped with an operating valve that can freely connect and shut off two ports, there is another novel feature in which an air branch pipe branched from an air pipe line is connected to the operating valve. A window cleaning machine for a vehicle, characterized in that an input port is provided so that when the input port and the output port are cut off, the new input port can freely communicate with the input port and the output port. Cleaning liquid jetting device.