JP2005014787A - Window washer device and window washer liquid heating device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a window washer device capable of efficiently heating and injecting washing liquid at a small consumed power. <P>SOLUTION: In this window washer device 1, a high frequency power is temporarily supplied to a heating coil 7 in accordance with an injection timing of washing liquid, and the washing liquid in a stainless tube 6 is quickly induction-heated. Therefore, current is efficiently conducted, so as to prevent a battery from running out of electricity and the like. Because only the cleaning liquid flowing through the stainless tube 6, but not the whole cleaning liquid in the entire tank 2 is heated, the cleaning liquid can be spontaneously heated to high temperatures, so as to quickly melt snow and ice. As a result, the cleaning liquid can be saved. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a window washer device that injects a cleaning liquid onto a window glass of a vehicle, and more particularly to a window washer device that heats and injects the cleaning liquid when the window glass of a vehicle freezes or accumulates snow.
[0002]
[Prior art]
When the window glass of a vehicle freezes or accumulates snow, the attached ice or snow may not be easily removed by merely injecting the cleaning liquid onto the window glass by the window washer device and operating the wiper. Therefore, as a countermeasure in such a case, a technique is known in which the cleaning liquid stored in the tank of the window washer device is heated in advance and sprayed when the window glass freezes or accumulates (for example, Patent Document 1). .
[0003]
In such a technique, the tank itself is constituted by a heat insulating container, and a heater is provided inside the tank. The temperature of the cleaning liquid in the tank is constantly monitored by a sensor, and whenever the temperature falls below a predetermined temperature, the heater is automatically turned on and heated to keep the temperature of the cleaning liquid at a certain level or higher. The sprayed cleaning liquid can be sprayed.
[0004]
[Patent Document 1]
Japanese Utility Model Laid-Open No. 5-16524 (paragraph number [0008] etc.)
[0005]
[Problems to be solved by the invention]
However, in the conventional window washer device described above, the entire cleaning liquid in the tank is always kept at a temperature at which it can be defrosted. For example, when the vehicle is stopped for a long period of time, even if the tank itself has a heat insulation structure. Therefore, it is necessary to energize the heater frequently, which increases the power consumption of the battery and may cause a so-called battery exhaustion.
[0006]
In addition, when heating the cleaning liquid stored in the tank, it is not preferable to set the temperature of the cleaning liquid to a very high temperature in consideration of the thermal deterioration of the tank and the occurrence of problems due to evaporation of the cleaning liquid. For this reason, the temperature of the cleaning liquid is generally limited to a certain value or less. As a result, when snow is stored, a large amount of cleaning liquid must be used, which increases the number of times the cleaning liquid is replenished.
[0007]
The present invention has been made in view of these points, and provides a window washer liquid heating apparatus that can efficiently heat a cleaning liquid with low power consumption, and a window washer apparatus that can efficiently dissolve snow accumulation and the like by applying the window washer liquid heating apparatus. The purpose is to provide.
[0008]
[Means for Solving the Problems]
In the present invention, in order to solve the above problem, a tank for storing the cleaning liquid, a pump for pumping out the cleaning liquid stored in the tank and pumping it, an injection nozzle for injecting the cleaning liquid, and the injection nozzle from the tank to the injection nozzle Supplying a high-frequency power to the heating coil in accordance with the timing of spraying the cleaning liquid, a metal tube provided at least in a part of the piping path, a heating coil arranged to wind around the metal pipe, There is provided a window washer device comprising heating means for inductively heating the cleaning liquid flowing in the metal tube toward the spray nozzle.
[0009]
Here, the “metal pipe” may be configured to be connected to, for example, a resin pipe constituting the pipe path, or, when the entire pipe path is a metal pipe, the metal pipe A heating coil may be wound around a part of the tube.
[0010]
The heating means may supply high-frequency power to the heating coil simultaneously with the driving of the window washer device, for example, or may supply high-frequency power with a certain time difference from the driving. The function of the heating means may be realized in hardware by a predetermined circuit, or may be realized in software by a predetermined program.
[0011]
According to such a window washer device, high-frequency power is supplied to the heating coil in synchronization with the spray timing of the cleaning liquid, and the cleaning liquid in the metal tube is induction-heated. That is, a magnetic field generated by a current flowing in the heating coil generates an eddy current in the metal tube, and the metal tube is heated by Joule heat due to the eddy current and the electric resistance (skin resistance) of the metal tube. In particular, since the eddy current has a property of flowing more as it approaches the metal surface (skin effect), the temperature of the metal tube, which is the tube material, can be instantaneously raised by the supply amount of high-frequency power, and the internal cleaning liquid can be quickly discharged. And it can be heated to high temperatures.
[0012]
For this reason, it is not necessary to heat the cleaning liquid by energizing it frequently so that the cleaning liquid is always at a certain temperature or higher as in the prior art, and it is only necessary to supply high-frequency power in accordance with the cleaning liquid injection timing. When power is supplied, the battery can be prevented from running out.
[0013]
Moreover, since it is the structure which heats a metal tube temporarily, a washing | cleaning liquid can also be heated to the high temperature near the boiling point, for example. For this reason, a high temperature washing | cleaning liquid can be injected and this can be rapidly melt | dissolved with a little washing | cleaning liquid, when it accumulates snow. As a result, the cleaning liquid can be saved.
[0014]
As described above, the window washer device of the present invention can efficiently heat and spray the cleaning liquid with low power consumption, and can efficiently melt icing or snow accumulation.
Further, in the present invention, a tank for storing the cleaning liquid, a pump for pumping out the cleaning liquid stored in the tank and pumping it, an injection nozzle for injecting the cleaning liquid, a coil wound around the tank, and the injection nozzle from the tank The metal pipe provided in at least a part of the pipe route leading to the pipe, and both ends of the metal pipe as terminals are used to supply high-frequency power to the metal pipe in accordance with the spraying timing of the cleaning liquid, and the jet inside the metal pipe There is provided a window washer device comprising heating means for inductively heating the cleaning liquid flowing toward the nozzle.
[0015]
According to such a window washer device, the metal tube itself is wound in a coil shape, generates heat upon receiving the supplied high-frequency power, and heats the cleaning liquid flowing inside. As a result, the same effect as described above by induction heating can be obtained. Moreover, since a heating coil is not required, the number of parts can be reduced as a whole window washer device.
[0016]
By the way, such cleaning liquid heating is necessary when the surrounding environment is cold, for example, when the window glass of the vehicle freezes or accumulates snow, but it depends on the season and the surrounding environment where the vehicle is placed. May be unnecessary. In such a case, heating the cleaning liquid similarly is a waste of electric power, which is not preferable.
[0017]
Therefore, when the first detection means detects the outside air temperature and the heating means detects that the outside air temperature detected by the first detection means is equal to or higher than a preset temperature, the supply amount of the high frequency power is limited. It is good to.
[0018]
Here, “restricting the supply amount of high-frequency power” means stopping the supply of the high-frequency power itself or reducing the supply amount of the high-frequency power (the same applies hereinafter). The latter is effective, for example, when the ambient temperature is not so low and snow storage, icing, frost, etc. adhering to the window glass melt relatively easily. With such a configuration, the power consumption of the entire window washer device can be reduced.
[0019]
The “preset temperature” may be provided in stages, and can be set as appropriate in consideration of, for example, a melting experiment such as freezing, or the specifications of the window washer device.
[0020]
In addition, when the cleaning liquid of the window washer device is emptied, if the heating is performed as described above, particularly when the heating temperature is high, the temperature of the metal tube and its peripheral devices rises, causing damage or failure. There is concern.
[0021]
Therefore, when the second detection unit detects the temperature of the metal tube and the heating unit detects that the temperature of the metal tube detected by the second detection unit is equal to or higher than a preset temperature, the supply amount of the high frequency power It is better to limit
[0022]
As for the “preset temperature” here, for example, the rising temperature of the metal tube when the cleaning liquid in the tank is actually emptied is experimentally detected or calculated, the heat resistance temperature of the metal tube and peripheral devices, Or it can set suitably as a standard which judges the overheating state of the metal tube in consideration of the use conditions etc. of a window washer device.
[0023]
In this way, damage to the metal tube and its peripheral devices due to overheating of the metal tube can be prevented.
In addition, when using induction heating, there is a concern that electromagnetic waves generated in the coil portion may become noise and adversely affect peripheral devices.
[0024]
Therefore, in order to prevent or suppress the leakage of the magnetic flux generated by the heating coil to the outside, it is preferable to provide a shielding member that covers the heating coil and the metal tube inside thereof from the outside. Further, when the metal tube itself forms a coil portion, a shielding member that covers the metal tube from the outside may be provided.
[0025]
In addition, the heating temperature of the cleaning liquid can be set from the outside by the temperature control switch, and when the heating means has set the heating temperature of the cleaning liquid by the temperature control switch, the supply set in advance to approach the heating temperature. You may comprise so that supply of high frequency electric power may be controlled so that it may become quantity. In this way, the occupant can control the heating of the cleaning liquid by operating the temperature adjustment switch after judging the necessity of heating the cleaning liquid by looking at the state of the window glass of the vehicle.
[0026]
Further, the present invention includes a tank for storing the cleaning liquid, a pump for pumping out the cleaning liquid stored in the tank and pumping it, an injection nozzle for injecting the cleaning liquid, and a pipe extending from the tank to the injection nozzle. A window washer liquid heating device that is used in a window washer device and is capable of heating the cleaning liquid, and is connected in the middle of the piping path and passes through the cleaning liquid from the tank toward the spray nozzle, and the metal A heating coil arranged so as to be wound around the tube, and high-frequency power is supplied to the heating coil in accordance with the spray timing of the cleaning liquid, and the cleaning liquid flowing in the metal pipe toward the spray nozzle is induction-heated. And a window washer liquid heating device comprising a heating means.
[0027]
By applying such a window washer liquid heating device to a window washer device, the same effect as described above by induction heating can be obtained.
Further, the present invention includes a tank for storing the cleaning liquid, a pump for pumping out the cleaning liquid stored in the tank and pumping it, an injection nozzle for injecting the cleaning liquid, and a pipe extending from the tank to the injection nozzle. A window washer liquid heating device that is used in a window washer device and that can heat the cleaning liquid, is wound in a coil shape, is connected in the middle of the path of the piping, and passes through the cleaning liquid from the tank toward the spray nozzle Heating by induction heating of the cleaning liquid flowing in the metal pipe toward the spray nozzle by supplying high-frequency power to the heating coil in synchronization with the spray timing of the cleaning liquid, using both ends of the metal pipe as terminals. And a window washer liquid heating device.
[0028]
By applying such a window washer liquid heating device to a window washer device, the same effect as described above by induction heating can be obtained. Moreover, since a heating coil is not required, the number of parts can be reduced as a whole window washer liquid heating device.
[0029]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[First Embodiment]
FIG. 1 is an explanatory diagram showing a schematic configuration of the window washer device according to the first embodiment of the present invention.
[0030]
The window washer device 1 is mounted on a vehicle (not shown), a tank 2 for storing the cleaning liquid, a pump 3 for pumping out the cleaning liquid stored in the tank 2, a jet nozzle 4 for injecting the cleaning liquid, and a tank 2. The resin tubes 5a and 5b and the stainless steel pipe 6 constituting the piping path from the nozzle to the injection nozzle 4, the heating coil 7 arranged so as to be wound around the stainless steel pipe 6, and the cleaning liquid injection timing. A high frequency generation circuit 8 (heating means) for supplying and controlling high frequency power to the heating coil 7 is provided. A signal line extending from a window washer switch 9 provided in the passenger compartment is connected to the pump 3 and the high frequency generation circuit 8, and when the window washer switch 9 is turned on by a driver, a drive signal representing it is input. .
[0031]
The pump 3 is interposed in a tube 5 a extending from the tank, and a tube 5 b is connected to the injection nozzle 4. The stainless steel pipe 6 is connected so as to be interposed between both tubes 5a and 5b.
[0032]
The heating coil 7 is wound along the longitudinal direction of the stainless steel tube 6, and both ends thereof are connected to lead wires extending from the high frequency generation circuit 8.
The high frequency generation circuit 8 includes a temperature sensor 12 (first detection means) for detecting the outside air temperature and a temperature sensor 13 (second detection means) for detecting the surface temperature of the stainless steel tube 6. Connected so that signals can be input.
[0033]
As shown in FIG. 2, the high-frequency generation circuit 8 is composed of a high-frequency inverter, and MOSFETs Q1 to Q4 connected to the battery 11 and gate voltages V1 to V4 are applied to the MOSFETs Q1 to Q4, respectively, and switching control is performed. Thus, the inverter control circuit 21 is configured to control the induced current flowing through the heating coil 7. Further, in order to prevent a DC component from being generated in the supply voltage and applied to the heating coil 7, a DC cutting capacitor 22 is provided between the contact between the MOSFETs Q1 and Q2 and the heating coil 7. Is provided. Further, a temperature adjustment switch 23 is provided so that the occupant can adjust the temperature of the cleaning liquid in the cab of the vehicle. This temperature control switch 23 is composed of a variable resistor, and can set the heating temperature of the cleaning liquid freely. Therefore, the vehicle occupant can raise the cleaning liquid to an appropriate temperature by observing the icing / storing state of the window glass during snowfall. When the temperature control signal from the temperature control switch 23 is input, the inverter control circuit 21 performs heating control based on the temperature control signal.
[0034]
When an induction magnetic field is generated in the heating coil 7 by switching the supply voltage by the inverter control circuit 21, an eddy current is generated in the stainless steel tube 6 by the induction magnetic field. Then, Joule heat corresponding to the eddy current and the skin resistance of the stainless steel tube 6 is generated, whereby the cleaning liquid flowing inside the stainless steel tube 6 is heated.
[0035]
In the present embodiment, the frequency of the high frequency power output from the high frequency generation circuit 8 is set to about 20 kHz, and the stainless steel tube 6 is employed as a metal tube suitable for induction heating at this time. FIG. 3 is an explanatory diagram showing the relationship between the metal tube material and its skin resistance based on the frequency of the high-frequency power supplied. The greater the skin resistance, the greater the Joule heat and the heating performance.
[0036]
According to the figure, as a material having a relatively large skin resistance, iron and the like can be cited in addition to stainless steel (SUS430, SUS304, etc.). These materials generate large Joule heat when induced currents of the same magnitude flow, and can realize induction heating at a high temperature. On the other hand, for example, materials such as copper and aluminum have a relatively low skin resistance, making it difficult to perform induction heating at a high temperature. Therefore, in order to inductively heat the latter material, it is necessary to use a high frequency generator capable of outputting a large current or to supply power at a high frequency at which the skin resistance increases. When the frequency of the high frequency power output from the high frequency generation circuit 8 is set to about 20 kHz as in the present embodiment, it can be seen that stainless steel, iron, or the like is suitable.
[0037]
Next, the control operation of the window washer device 1 will be described.
FIG. 4 is an explanatory diagram showing a specific operation of the high-frequency generator circuit 8. FIG. 4 (a) is a timing chart when the heating amount of the heating coil 7 is increased, and FIG. FIG. 4C is a timing chart when the heating amount is moderate, and FIG. 3C is a timing chart when the heating amount is reduced. In each figure, the upper stage shows the timing of on / off control of the gate voltages V1 to V4 to each MOSFET, and the lower stage shows the voltage VL applied to the heating coil 7 at that time, and thereby the heating coil 7. The change of the induced current IL flowing through is shown. In each figure, the horizontal axis represents time (ms), and the vertical axis represents voltage VL (V) and induced current IL (A).
[0038]
The inverter control circuit 21 starts energization control in synchronization with the drive signal input from the window washer switch 9, and the outside air temperature detected by the temperature sensor 12, the temperature of the stainless steel tube 6 detected by the temperature sensor 13, and the temperature adjustment. Based on the set temperature of the switch 23, the supply amount of the high frequency power supplied to the heating coil 7 is controlled.
[0039]
That is, when the outside air temperature is a preset extremely low temperature (for example, −5 ° C. or lower) and the vehicle window glass is assumed to have a lot of snow accumulation or icing or difficult to melt, the outside air temperature is a preset low temperature. (For example, higher than −5 ° C. and lower than 5 ° C.), and when the temperature of the attached snow or ice is assumed to be easily melted even if it is not high, and the outside air temperature is other than that (for example, 5 The heating control state is changed in each case where the temperature is equal to or higher than ° C. and the temperature is assumed to be free of snow and ice. That is, when it is determined that the temperature is extremely low, the amount of high-frequency power supplied to the heating coil 7 is increased to heat the cleaning liquid to a high temperature (for example, 60 ° C.). When it is determined that the temperature is low, the supply amount of the high-frequency power is decreased to heat the cleaning liquid to a temperature lower than the high temperature (for example, 50 ° C.). Furthermore, when it is determined that the temperature is other than that, the supply of the high frequency power is stopped so that the cleaning liquid is not heated.
[0040]
Further, when the vehicle occupant observes icing and snow accumulation on the window glass of the vehicle and operates the temperature adjustment switch 23, the cleaning liquid is heated to the set temperature within a predetermined temperature range (for example, a range up to 80 ° C.).
[0041]
In the present embodiment, on / off switching of MOSFETs Q1, Q4 and MOSFETs Q2, Q3 is controlled to generate a desired induced electromotive force in heating coil 7.
That is, when increasing the heating amount, as shown in FIG. 4A, the gate voltages V1 and V4 (solid lines in the figure) and the gate voltages V2 and V3 (broken lines in the figure) are alternately shown in the upper part of the figure. ON / OFF control. As a result, the positive / negative switching cycle of the voltage VL (broken line in the figure) becomes longer as shown in the lower part of the figure, and as a result, the induced current IL (solid line in the figure) increases. Since the magnitude of the eddy current generated in the stainless steel pipe 6 is proportional to the magnitude of the induced current IL generated in the heating coil 7, the Joule heat generated in the stainless steel pipe 6 at this time is 2 times the magnitude of the induced current IL. It is proportional to the product of the multiplication and the skin resistance of the heating coil 7.
[0042]
On the other hand, when the heating amount is moderate, as shown in FIG. 5B, the gate voltages V1 and V4 and the gate voltages V2 and V3 are turned on and off at predetermined intervals as shown in the upper part of FIG. Control off. As a result, the positive / negative switching cycle of the voltage VL is shorter than that when the heating amount is large as shown in the lower part of the figure, and as a result, the magnitude of the induced current IL is also reduced. As a result, Joule heat generated in the stainless steel tube 6 is reduced.
[0043]
Further, when the heating amount is made small, the gate voltages V1, V4 and the gate voltages V2, V3 are intermittently turned on / off at large intervals as shown in the upper part of the figure, as shown in FIG. To do. As a result, the positive / negative switching cycle of the voltage VL is further shorter than that in the heating amount as shown in the lower part of the figure, and the magnitude of the induced current IL is further reduced. As a result, Joule heat generated in the stainless steel tube 6 is further reduced.
[0044]
Further, the inverter control circuit 21 determines that the outside temperature or the temperature adjustment switch 23 described above is used when the surface temperature of the stainless steel pipe 6 is equal to or higher than a preset temperature at which the cleaning liquid in the tank 2 is assumed to be empty. Regardless of the set temperature, the supply of high-frequency power to the heating coil 7 is stopped. In the present embodiment, the rising temperature of the stainless pipe 6 immediately after the cleaning liquid in the tank is actually emptied is experimentally detected, and the temperature is set in advance.
[0045]
When the window washer switch 9 is turned on by a vehicle occupant, a drive signal is input to each of the pump 3 and the high frequency generation circuit 8.
When the pump 3 receives this drive signal, the actuator is driven to pump out the cleaning liquid stored in the tank 2 and pump it toward the injection nozzle 4. At the same time, the high frequency generation circuit 8 is driven to perform any of the above-described heating controls based on input signals from the temperature sensors 12 and 13 and the temperature adjustment switch 23.
[0046]
That is, when the surface temperature of the stainless steel tube 6 detected by the temperature sensor 13 is equal to or higher than the set value described above, the high-frequency power is not supplied and the cleaning liquid is not heated. On the other hand, when the outside air temperature detected by the temperature sensor 12 is the above-described extremely low temperature or low temperature, or when the temperature adjustment switch 23 is operated, high-frequency power of an amount corresponding to the set temperature is supplied. . Then, the stainless steel tube 6 is heated by induction heating, and the temperature of the cleaning liquid flowing through the stainless steel tube instantaneously rises to the same level as the stainless steel tube 6.
[0047]
In this way, when the appropriate temperature of the cleaning liquid is sprayed from the spray nozzle 4 toward the window glass of the vehicle, and there is snow accumulation or freezing, it can be easily melted.
In the present embodiment, the stainless steel tube 6, the heating coil 7, the high frequency generation circuit 8, the temperature sensors 12, 13 and the temperature control switch 23 correspond to the window washer liquid heating device.
[0048]
[Second Embodiment]
Next, a second embodiment of the present invention will be described. The present embodiment is the same as the configuration of the first embodiment except that the configuration of the portion that generates induction heating is different, and therefore the same components are denoted by the same reference numerals. The description is omitted. FIG. 5 is an explanatory diagram showing a schematic configuration of the stainless steel tube of the present embodiment.
[0049]
As shown in the figure, in the present embodiment, the stainless steel tube 206 itself is wound to constitute a coil portion. Therefore, the heating coil 7 as in the first embodiment is not provided. The power supply terminals of the high frequency generation circuit 8 are connected to both ends of the stainless steel tube 206, respectively.
[0050]
For this reason, when the window washer switch 9 is turned on by a vehicle occupant, the high-frequency generation circuit 8 is driven, and any one of the above-described heating controls is executed based on the input signals from the temperature sensors 12 and 13. When the high-frequency power is supplied to the stainless steel tube 206, the cleaning liquid flowing inside the stainless steel tube 206 is heated by induction heating.
[0051]
According to the present embodiment, the same effects as those of the first embodiment can be obtained, and since the heating coil is not required, the number of parts can be reduced as the whole window washer device.
[0052]
The preferred embodiment of the present invention has been described above, but the present invention is not limited to the specific embodiment, and it can be changed and modified within the spirit of the present invention. Not too long.
[0053]
For example, in the configuration of the first embodiment, when a transformer is necessary depending on the shape and material of the heating coil 7, a matching transformer 210 as shown in FIG. 6 may be employed.
[0054]
As shown in FIG. 7, in the configuration of the first embodiment, a shielding member 310 that electromagnetically shields the heating coil 7 and the stainless steel tube 6 therein from the outside may be provided. As a material of the shielding member 310, for example, an aluminum material or a ferrite core can be employed. These materials have a relatively low skin resistance as described above, and are hardly heated at the frequency (20 kHz) when the stainless steel tube 6 is heated. For this reason, it is possible to prevent other parts of the vehicle (such as bonnet covers and iron parts such as engine parts) from being heated by heat conduction through these materials. Moreover, since the magnetic force lines leaking from the heating coil 7 can be shielded, a noise prevention effect for the electronic control device and the car audio can be obtained. The shielding member 310 may be a box-shaped member made of a plate material as shown in the figure, but may be covered with a mesh member that is fine to some extent. Such a shielding structure can be similarly applied to the configuration of the second embodiment.
[0055]
In each of the above embodiments, the high frequency generation circuit 8 is configured as a circuit that performs hardware processing. However, the high frequency generation circuit 8 is configured by a microcomputer and input signals from the temperature sensors 12 and 13 are displayed. Based on the above, a determination may be made when performing the heating control, and this may be processed in a software manner.
[0056]
Furthermore, although the drive signal from the window washer switch 9 was directly input to the pump 3 and the high frequency generation circuit 8, the drive signal was once input via a vehicle control controller (electronic control device). There may be.
[0057]
【The invention's effect】
As described above, in the present invention, high-frequency power is temporarily supplied to the heating coil in synchronization with the spray timing of the cleaning liquid, and the cleaning liquid in the metal tube is rapidly induction-heated. For this reason, it can energize efficiently and a battery run-out etc. can be prevented. Further, since only the cleaning liquid flowing through the metal pipe is heated, not the cleaning liquid in the entire tank, the cleaning liquid can be instantaneously heated to a high temperature, and snow accumulation and freezing can be quickly melted. As a result, the cleaning liquid can be saved.
[0058]
Further, if the metal tube itself is coiled and energized, the number of parts can be further reduced as the whole window washer device.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram illustrating a schematic configuration of a window washer device according to a first embodiment of the invention.
FIG. 2 is an explanatory diagram showing a schematic configuration of a high frequency generation circuit constituting the window washer device.
FIG. 3 is an explanatory diagram showing the relationship between the material of a metal tube and its skin resistance based on the frequency of high-frequency power to be supplied.
FIG. 4 is an explanatory diagram showing a specific operation of the high frequency generation circuit.
FIG. 5 is an explanatory diagram showing a schematic configuration of a stainless steel tube constituting a window washer device according to a second embodiment of the present invention.
FIG. 6 is an explanatory diagram illustrating a modification of the first embodiment of this invention.
FIG. 7 is an explanatory diagram illustrating a modification of the first embodiment of this invention.
[Explanation of symbols]
1 Window washer device
2 tanks
3 Pump
4 Injection nozzle
6,206 Stainless tube
7 Heating coil
8 High frequency generator
9 Window washer switch
11 battery
12, 13 Temperature sensor
21 Inverter control circuit
23 Temperature control switch
210 Matching transformer
310 Shielding member
IL induced current
Q1, Q2, Q3, Q4 MOSFET

Claims (10)

A tank for storing cleaning liquid;
A pump that pumps out and pumps the cleaning liquid stored in the tank;
An injection nozzle for injecting the cleaning liquid;
A metal pipe provided in at least a part of a piping path from the tank to the injection nozzle;
A heating coil arranged to wind around the metal tube;
Heating means for supplying high-frequency power to the heating coil in accordance with the spray timing of the cleaning liquid, and for inductively heating the cleaning liquid flowing in the metal pipe toward the spray nozzle;
A window washer device comprising: A tank for storing cleaning liquid;
A pump that pumps out and pumps the cleaning liquid stored in the tank;
An injection nozzle for injecting the cleaning liquid;
A metal pipe wound in a coil shape and provided in at least a part of a piping path from the tank to the injection nozzle;
Heating means for supplying high-frequency power to the metal pipe in synchronization with the spray timing of the cleaning liquid and induction heating the cleaning liquid flowing in the metal pipe toward the spray nozzle, using both ends of the metal pipe as terminals,
A window washer device comprising: A first detecting means for detecting the outside air temperature;
The heating means limits the supply amount of the high-frequency power when the outside air temperature detected by the first detection means is equal to or higher than a preset temperature. The window washer device described. A second detection means for detecting the temperature of the metal tube;
The said heating means restrict | limits the supply amount of the said high frequency electric power, when the temperature of the metal tube which the said 2nd detection means detected is more than preset temperature. The window washer device according to 2. The window according to claim 1, wherein a shielding member is provided to cover the heating coil and a metal tube inside thereof in order to prevent or suppress leakage of magnetic flux generated by the heating coil to the outside. Washer device. The window washer device according to claim 2, wherein a shielding member is provided to cover the metal tube from the outside in order to prevent or suppress leakage of magnetic flux generated in the metal tube to the outside. The window washer device according to claim 1, wherein the metal tube is made of stainless steel or iron. A temperature control switch capable of setting the heating temperature of the cleaning liquid from the outside,
When the heating temperature of the cleaning liquid is set by the temperature adjustment switch, the heating means controls the supply of the high-frequency power so that the supply amount is set in advance to approach the heating temperature. The window washer device according to claim 1 or 2. A tank for storing cleaning liquid;
A pump that pumps out and pumps the cleaning liquid stored in the tank;
An injection nozzle for injecting the cleaning liquid;
Piping from the tank to the injection nozzle;
A window washer liquid heating device capable of heating the cleaning liquid,
A metal pipe that is connected in the middle of the path of the pipe and passes the cleaning liquid from the tank toward the spray nozzle,
A heating coil arranged to wind around the metal tube;
Heating means for supplying high-frequency power to the heating coil in accordance with the spray timing of the cleaning liquid, and for inductively heating the cleaning liquid flowing in the metal pipe toward the spray nozzle;
A window washer liquid heating device. A tank for storing cleaning liquid;
A pump that pumps out and pumps the cleaning liquid stored in the tank;
An injection nozzle for injecting the cleaning liquid;
Piping from the tank to the injection nozzle;
A window washer liquid heating device capable of heating the cleaning liquid,
A metal tube wound in a coil shape, connected in the middle of the path of the piping, and passing a cleaning liquid from the tank toward the spray nozzle;
Heating means for supplying high-frequency power to the metal pipe in synchronization with the spray timing of the cleaning liquid and induction heating the cleaning liquid flowing in the metal pipe toward the spray nozzle, using both ends of the metal pipe as terminals,
A window washer liquid heating device.

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