JPS643723Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a cleaning liquid jetting device for a vehicle in which jetting and stopping of cleaning liquid from a cleaning liquid nozzle provided in a window cleaning machine for a vehicle is controlled by an operation valve.

Conventionally, as this type of cleaning liquid jetting device, part 1
For example, as shown in FIG. 9, separate cleaning liquid nozzles 1a,
1b, a 3-position, 3-port multi-position directional switching valve as shown in the figure was used as the operating valve 2. And the two output ports of operation valve 2
First outlet side cleaning liquid supply pipes 3a leading to the cleaning liquid nozzle 1a on the driver's seat side in Wa and Wb, respectively.
and a second outlet side cleaning liquid supply pipe 3b leading to the cleaning liquid nozzle 1b on the passenger seat side are connected,
An inlet side cleaning liquid supply pipe 3 common to these is arranged across the input port F of the operating valve 2 and the cleaning liquid tank 4. In addition, in the cleaning liquid tank 4,
Window cleaning machine drive device 5 on both the driver's seat side and the passenger's seat side
When pressurized air is supplied to the drive devices 5a and 5b from a pressure air source 6 common to the drives 5a and 5b through a pneumatic supply and discharge pipe 8 equipped with a pressure reducing valve 7, the pressure is reduced. The structure was such that air was supplied after being depressurized by a valve 7.

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.

For example, if cleaning liquid is sealed in the inlet side cleaning liquid supply pipe 3, no problem will occur if the vehicle is being operated in the winter due to the effect of heating the inside of the vehicle, but if the vehicle is left unattended during the winter. In such a case,
The cleaning liquid may freeze inside the inlet-side cleaning liquid supply pipe 3, which may cause cracking of the pipe or make it impossible to immediately re-supply the cleaning liquid. The first outlet side cleaning liquid supply line 3a and the second outlet side cleaning liquid supply line 3b also have similar drawbacks. 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 measures to prevent the cleaning liquid from freezing, it is possible to install a heater in the piping system of each conduit or to convert the cleaning liquid into an antifreeze liquid. However, the former is
This is difficult to realize because the piping system is long due to the mounting positions of the cleaning liquid tank 4, the operating valve 2, etc., and the latter is not preferable because it increases the cost of the cleaning liquid. Also, before stopping the operation of the vehicle, drain the cleaning liquid in the cleaning liquid tank 4 to each cleaning liquid nozzle 1.
It is conceivable that the entire amount may be discharged from a and 1b, but in this case, not only must the cleaning liquid be filled into the cleaning liquid tank 4 each time the vehicle is restarted, but generally speaking, the cleaning liquid tank 4 must be filled with cleaning liquid.
However, due to practical requirements, it is quite large and requires a long time to discharge the entire amount, which is impractical.

This idea was made in order to improve the drawbacks of the conventional method.The cleaning liquid in the cleaning liquid supply pipe connecting the cleaning liquid tank and the cleaning liquid nozzle is returned to the cleaning liquid tank, and the cleaning liquid in the cleaning liquid supply pipe is frozen. The technical challenge is to prevent pipe cracking and the like caused by this.

The means to solve this technical problem is to arrange a solenoid valve in the pneumatic supply/drain line that supplies pressurized air to the cleaning liquid tank in order to generate the liquid pressure for jetting the cleaning liquid, and to connect the cleaning liquid tank and the cleaning liquid nozzle. A float valve operated valve is arranged in the cleaning liquid supply pipe connecting the When the float of the valve is seated and the cleaning liquid supply line is cut off, and the air pressure in the cleaning liquid tank disappears due to the demagnetization of the solenoid valve, the float of the float valve type operation valve is unseated and the cleaning liquid supply line is closed. This is because a switching position that is communicated is provided. By applying such means, it is possible to demagnetize the electromagnetic valve to eliminate the air pressure in the cleaning liquid tank, and to return the cleaning liquid in the cleaning liquid supply pipe to the cleaning liquid tank via the operating valve. Therefore, it is possible to prevent the cleaning liquid in the cleaning liquid supply conduit from freezing and pipe cracking caused by this.

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

In FIG. 1, a pressure reducing valve 7 and a solenoid valve 9 on the downstream side thereof are disposed in an air pressure supply/discharge pipe 8 that connects a pressure air source 6, which is an operating source of a window cleaning machine drive device 5a, and a cleaning liquid tank 4. has been done. The pressure reducing valve 7 is the ninth
As explained in the figure, the open state is maintained by the air pressure of the pressurized air source 6. Moreover, the solenoid valve 9 is
When the solenoid valve power switch SW is turned on, it is energized and switched to the air supply position Supply/discharge pipe 8
can be switched to the atmosphere release position Y, which releases the air to the atmosphere. On the other hand, a float valve type operation valve 10 is arranged in a cleaning liquid supply pipe line connecting the cleaning liquid tank 4 and the cleaning liquid nozzle 1a. Float valve type operation valve 1
0, a 2-position, 2-port switching valve is used, and its input port F is connected to the inlet side cleaning liquid supply pipe 3 from the cleaning liquid tank 4, and its output port Wa is connected to the cleaning liquid nozzle 1a. The outlet side cleaning liquid supply pipe 3a is maintained. Further, an example of the float valve type operation valve 10 is the second
As shown in Figs.
In the internal passage 11 connecting the and output port Wa,
A float valve mechanism 12 is provided, and the float valve mechanism 12 is configured to be switched between a free state and a restrained state by the vertical movement of a cam 14 that responds to a handle 13 and a piston 15 that interlocks with the cam 14. ing. Here, the free state is a state where the piston 15 and the float 12a of the float valve mechanism 12 are separated by being pushed upward by the return spring 16, and as shown in FIG. is shown in the first position A. In addition, the restrained state is a state in which the piston 15 is pushed down by the cam 14 against the urging force of the return spring 16, and in conjunction with this, the float 12a of the float valve mechanism 12 is prevented from being seated by the piston 15. 1, and is shown in the second position B in FIG. In addition, in FIG. 4, 12b is the float valve mechanism 1.
This is the second valve seat.

In the above configuration, the cleaning liquid tank 4 is installed at a lower position than the cleaning liquid nozzle 1a, and when the solenoid valve power switch SW is turned on and the solenoid valve 9 is switched to the air supply position , a pressure reducing valve 7 from the pressure air source 6 to the cleaning liquid tank 4
Since pressurized air is supplied through the pressure air source 6, a pressure lower than the air pressure of the compressed air from the pressure air source 6 is generated in the cleaning liquid tank 4, and the liquid pressure for jetting the cleaning liquid due to this pressure causes the cleaning liquid to flow into the inlet. The inside of the side cleaning liquid supply pipe 3 is pushed up. Therefore, at this time, if the float valve type operation valve 10 is switched to the first position A, the float 12a is pushed up by the above-mentioned hydraulic pressure and is seated on the valve seat 12b, so that the float valve type operation valve 10 is switched to the first position A. The internal passage 11 of the valve 10 is blocked (indicated by a solid line at the first position A of the operation valve 10), and the jetting of the cleaning liquid from the cleaning liquid nozzle 1a is stopped. Cleaning liquid is sealed inside the internal passage 11 of 10 and the outlet side cleaning liquid supply pipe 3a. On the other hand, from this state, when the vehicle is stopped, the solenoid valve power switch SW is turned off, and the solenoid valve 9 is switched to the atmosphere release position Y, the pressurized air in the cleaning liquid tank 4 is discharged and the pressure reaches 0 kg/ ^cm2 . Therefore, the float 12a of the float valve type operating valve 10 moves away from the valve seat 12b, and the internal passage 11 thereof is opened (a passage indicated by a dotted line in the first position A of the operating valve 10 is formed). Therefore, depending on the height difference between the cleaning liquid nozzle 1a and the cleaning liquid tank 4, the outlet side cleaning liquid supply pipe 3a and the internal passage 1 of the float valve type operation valve 10 are
The cleaning liquid sealed in the cleaning liquid supply pipe 1 and the inlet side cleaning liquid supply pipe 3 returns to the cleaning liquid tank 4 due to its own weight.

Further, when the solenoid valve 9 is in the air supply position X and the float valve type operation valve 10 is switched to the second position B, the cleaning liquid is ejected from the cleaning liquid nozzle 1a.
Next, when the float valve type operation valve 10 is switched to the first position A, as described above, the cleaning liquid nozzle 1
The ejection of cleaning liquid from a is stopped.

FIG. 5 shows another embodiment. This embodiment differs from the one in FIG.
a, 5b are provided, and cleaning liquid nozzles 1a, 1b are attached to these, respectively.Along with this, a 3-position, 3-port switching valve is adopted as the float valve type operation valve 10.

As an example of such a float valve operated valve 10 is shown in FIGS. 6, 7, and 8, an input port F and two output ports Wa,
Float valve type operating valves 12, 12 are provided in the respective internal passages 11a, 11b connecting with Wb, and these float valve mechanisms 12, 12,
A cam 14 responsive to the handle 13 and the cam 14
By means of separate pistons 15, 15 interlocked with
The structure is such that it can be switched to the above-mentioned free state and restrained state at the same time. As is clear from FIG. 5, the two output ports Wa and Wb of the float valve type operation valve 10 each have a first outlet-side cleaning liquid supply pipe 3a leading to the cleaning liquid nozzle 1a on the driver's seat side. A second outlet side cleaning liquid supply pipe 3b communicating with the cleaning liquid nozzle 1b on the passenger seat side is connected. Further, in the first position A of the float valve type operation valve 10, the above-mentioned float valve mechanism 12, 12 is connected to both the two output ports Wa, Wb.
In the second position B, the above-mentioned restraint state of the float valve mechanism 12 is set in both the two output ports Wa and Wb, but the second outlet side cleaning liquid supply pipe 3b is in the free state. The connected output port Wb is cut off. Furthermore, in the third position C,
The above-mentioned constraint state is set for both output ports Wa and Wb of No. 2.

Therefore, when the solenoid valve 9 is switched to the air supply position X, the float valve type operation valve 1
0 is switched to the first position A, the jetting of the cleaning liquid from the cleaning liquid nozzles 1a and 1b on both the driver's seat side and the passenger seat side is stopped. Then, from this state, when the solenoid valve 9 is switched to the atmosphere open position Y, the first outlet side cleaning liquid supply line 3a, the second outlet side cleaning liquid supply line 3b, and the internal passage of the float valve type operation valve 10 are opened. 11 and inlet side cleaning liquid supply pipe 3
The cleaning liquid sealed in the cleaning liquid nozzle 1a,
Depending on the height difference between 1b and the cleaning liquid tank 4, it returns to the cleaning liquid tank 4 by its own weight.

Furthermore, when the solenoid valve 9 is in the air supply position When switched to the third position C, cleaning liquid is ejected from the cleaning liquid nozzles 1a and 1b on both the driver's seat side and the passenger seat side.

Further, when the solenoid valve 9 is in the atmosphere open position Y and the float valve type operation valve 10 is switched to the second position B, the first outlet side cleaning liquid supply pipe 3a and the internal passage 11 of the float valve type operation valve 10 are switched to the second position B. The cleaning liquid sealed in the inlet side cleaning liquid supply pipe 3 then returns to the cleaning liquid tank 4. Furthermore, when the solenoid valve 9 is in the atmosphere open position Y, if the float valve type operation valve 10 is switched to the third position C, it is the same as the case where the float valve type operation valve 10 is switched to the first position A. be. Other points are the same as those described in FIGS. 1 to 4, so corresponding elements are designated by the same reference numerals and description thereof will be omitted.

As detailed above, according to this invention, when the float valve type operation valve is switched to the first position A and the solenoid valve is in the excited state, the jetting of the cleaning liquid is stopped and the solenoid valve is activated. In the demagnetized state, the cleaning water sealed in the cleaning liquid supply pipe is
Conventionally, it returns to the cleaning liquid tank due to its own weight.
It becomes possible to provide a cleaning liquid ejecting device at a low cost that can prevent the problem of freezing of the liquid inside the cleaning liquid pipe and the occurrence of pipe cracking caused by the freezing of the liquid in the pipe.

[Brief explanation of drawings]

Fig. 1 is a circuit diagram of an embodiment of this invention, Fig. 2 is a front view of a float valve operated valve, Fig. 3 is a plan view of the same, Fig. 4 is a vertical sectional view of the same, and Fig. 5 is another embodiment. FIG. 6 is a front view of a modified example of the float valve operated valve, FIG. 7 is a plan view of the same, FIG. 8 is a vertical sectional view of the same, and FIG. 9 is a circuit diagram of a conventional example. 1a, 1b...Cleaning liquid nozzle, 3...Cleaning liquid supply pipe, 4...Cleaning liquid tank, 6...Pressure air source, 8...Pneumatic supply and discharge pipe, 9...Solenoid valve, 10
...Float valve type operation valve.

Claims (1)

[Scope of utility model registration request] In the cleaning liquid jetting device of a vehicle window cleaning machine, in which the jetting and stopping of cleaning liquid from the cleaning liquid nozzle installed in the vehicle window cleaning machine is controlled by an operating valve, pressurized air is supplied to the cleaning liquid tank in order to generate the liquid pressure for jetting the cleaning liquid. A solenoid valve is placed in the pneumatic supply/drainage line that supplies the cleaning liquid, and a float valve operated valve is placed in the cleaning liquid supply line that connects the cleaning liquid tank and the cleaning liquid nozzle. When air pressure is supplied to the cleaning liquid tank, the float of the float operation valve is seated due to the liquid pressure of the cleaning liquid, cutting off the cleaning liquid supply pipe, and the demagnetization of the solenoid valve causes the air pressure in the cleaning liquid tank to be 1. A cleaning liquid ejecting device for a vehicle window cleaning machine, characterized in that a switching position is provided in which a float of a float valve-type operating valve is released and a cleaning supply pipe is communicated with when the float valve disappears.