JP2012144194A - Heating device of washer liquid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating device that is capable of quickly raising a temperature of a washer liquid by a relatively low electric current, capable of heating the washer liquid of relatively large capacity, and capable of keeping a state of warming the washer liquid for a little while after cutting off a power supply.SOLUTION: This heating device 10 includes a structure for storing a small heating chamber 14 in an inside space 13 of a heat reserving hot water storage chamber 12 and storing an electric heater 16 in an inside space 15 of the small heating chamber 14. The heat reserving hot water storage chamber 12 has a heat insulation structure. The small heating chamber 14 has proper thermal conductivity. The washer liquid fed from a washer tank 72 is supplied to the small heating chamber 14 by passing through the heat reserving hot water storage chamber 12, and is heated by a heater 16, and is injected from a washer nozzle. Heat of the washer liquid in the small heating chamber 14 is thermally conducted in a wall surface of the small heating chamber 14, and is transmitted to the washer liquid in the heat reserving hot water storage chamber 12.

Description

  The present invention relates to a device that is disposed between a washer tank and a washer nozzle of a vehicle-mounted washer device, and warms the washer fluid with an electric heater, and can quickly raise the washer fluid at a relatively low current, and relatively A large volume of washer fluid can be heated, and even after the power is turned off, the washer fluid can be kept warm for a while, and the power required for temperature rise can be reduced when the power is turned on again. It is what I did.

  As a washer liquid heating device, there are a device using waste heat of an engine (Patent Document 1) and a device using an electric heater (Prior Art 2).

Japanese Patent Laid-Open No. 2002-264779 Japanese Utility Model Publication No. 6-27391

  The washer fluid heating device is intended to be used for defrosting, particularly in the cold winter, but there is a problem that it takes time for the washer fluid to warm up after the engine is started if the waste heat of the engine is used. In addition, a large current (40 amps or more) is required to raise the temperature of the washer fluid rapidly when using an electric heater. There is a problem that a large relay, a transistor element, or the like is required, which is expensive.

  The present invention has been made in view of the above points, and can quickly raise the washer fluid at a relatively low current, can heat a relatively large volume of washer fluid, and even after turning off the power for a while. Is intended to provide a washer fluid warming device that can maintain a warmed state of the washer fluid and reduce the power required for temperature rise when the power is turned on again.

  The washer fluid warming device of the present invention is a device that is disposed between a washer tank and a washer nozzle of a vehicle-mounted washer device, warms the washer fluid fed from the washer tank, and sends it to the washer nozzle. A heat insulating hot water storage wall having a heat insulating structure in which a vacuum layer is formed between an inner wall and an outer wall, wherein a washer liquid flowing out of the washer tank by driving a washer pump flows into the internal space; and A small heating chamber having a wall surface with a higher thermal conductivity than the wall surface, accommodated in the internal space of the heat retaining hot water storage chamber, wherein the washer liquid in the heat insulating hot water storage chamber flows into the internal space by driving the washer pump; Electricity that is accommodated in the internal space of the small heating chamber and heats the washer fluid in the small heating chamber A heater, and the internal space of the heat insulation hot water storage chamber is set to a size capable of accommodating a larger volume of washer liquid than the internal space of the small heating chamber, and flows out of the small heating chamber by driving the washer pump. The heated washer liquid is supplied to the washer nozzle.

  According to this invention, it is possible to warm the washer liquid in the small heating chamber and spray it from the washer nozzle by energizing the electric heater. The small heating chamber accommodates a small volume of washer fluid compared to the hot water storage chamber, so that the washer fluid in the small heating chamber can be rapidly heated without using a large current. When the washer liquid is not sprayed, the washer liquid in the heat retaining hot water storage chamber can be warmed through heat conduction on the wall surface of the small heating chamber. Since the heat insulation hot water storage room has a heat insulating structure, it can be kept warm for some time after the power is turned off, and the power required for temperature rise can be reduced when the power is turned on again.

  In this invention, the heat insulation hot water storage chamber has an opening communicating with the internal space from an external space, and a small heating chamber containing the electric heater is mounted on a lid that closes the opening, and the small heating chamber Can be inserted through the opening and accommodated in the internal space of the heat retaining hot water storage chamber, and the opening can be closed with the lid. According to this, a structure is simple and it can assemble easily. The lid supplies electric power to the washer fluid inflow passage for allowing the washer fluid to flow into the heat-retaining hot water storage chamber from the outside, the washer fluid outflow passage for allowing the washer fluid in the small heating chamber to flow outside, and the electric heater. It can have an electric wire lead-out path which pulls out an electric wire outside. According to this, it is not necessary to configure the washer liquid inflow path, the washer liquid outflow path, and the wire lead-out path in the heat insulating hot water storage chamber, and the configuration is simple and can be easily assembled.

  In the present invention, the small heating chamber is formed in a cylindrical shape extending in the vertical direction, and further includes a plate-shaped movable diaphragm lid that is accommodated in an internal space of the small heating chamber, and the electric heater is a rod-shaped Arranged along the central axis of the cylinder of the small heating chamber, the movable throttle cover has a central hole, and is arranged to be movable up and down along the electric heater through the electric heater in the central hole, The movable diaphragm lid is pushed up by a washer liquid flowing from the lower part of the internal space to cause the washer liquid on the upper side of the movable diaphragm lid to flow out of the small heating chamber, and when the inflow of the washer liquid stops, its own weight and / or The movable washer is lowered by a spring force, and when it is lowered, the washer liquid on the lower side of the movable diaphragm lid is removed from the gap between the inner surface of the small heating chamber and the movable diaphragm lid, the outer surface of the electric heater and the movable Inside the aperture lid Gap between the inner surface of the hole can be made to move to the upper side of the movable throttling lid through at least any one of the cavity formed in the plane of the movable throttling lid. According to this, when the washer liquid is sprayed from the washer nozzle, the washer liquid heated to the upper side of the movable diaphragm lid in the small heating chamber and supplied to the washer nozzle and still warmed from the lower portion of the small heating chamber Since the movable diaphragm cover can be prevented from being mixed with the washer liquid that is not used, the warm washer liquid can be ejected from the washer nozzle.

  According to the present invention, the bottom of the cylinder of the small heating chamber is closed with a plate material in which a throttle port is formed, and the washer liquid in the internal space of the heat retaining hot water storage chamber flows into the internal space of the small heating chamber through the throttle port. It can be made to. According to this, it is possible to suppress the warmed washer liquid in the small heating chamber from escaping from the lower portion of the small heating chamber. Further, according to the present invention, the washer liquid flows into the internal space from the upper part of the heat retaining hot water chamber and descends, and the lowered washer liquid flows into the internal space from the lower part of the small heating chamber and rises. It can have a flow path. According to this, the flow of the washer liquid in the heating device can be improved. Further, according to the present invention, the heat insulation hot water storage chamber and the small heating chamber can each be formed in a concentric cylindrical shape, for example. According to this, the heating device can be made compact, and can be installed in a narrow place such as an engine room of a vehicle.

It is a figure which shows Embodiment 1 of the heating apparatus by this invention, and is the front view and top view which show through the inside of a heating apparatus. It is the front view and top view which show through the heat insulation hot water storage chamber of the heating apparatus of FIG. It is the front view and top view which show through the lid | cover of the heating apparatus of FIG. FIG. 4 is a front view and a plan view showing a sealing rubber (O-ring) attached to the lid of FIG. It is the front view and top view which show through the small heating chamber of the heating apparatus of FIG. It is the front view and top view which see through and shows the lower cover of the heating apparatus of FIG. It is the front view and top view which show through the movable diaphragm lid of the heating apparatus of FIG. It is a figure which shows the electric system and supply system of a washer liquid when the heating apparatus of FIG. 1 is added to the existing washer apparatus. It is a schematic diagram which shows operation | movement of the heating apparatus of FIG. It is a graph which shows the experimental result of the temperature rise experiment by the prototype of the heating apparatus of FIG. 1, and shows the temperature change of the water in the small heating chamber after energizing a heater. It is a chart which shows the experimental result of the temperature rise experiment by the prototype of the heating apparatus of FIG. 1, and shows the change of the rise temperature from the initial temperature of the water in the heat insulation hot water storage chamber. It is a graph which shows the thermal insulation characteristic experiment result by the prototype of the heating apparatus of FIG. It is a figure which shows Embodiment 2 of the heating apparatus by this invention, and is a front view which shows through the inside of a heating apparatus typically.

Embodiment 1
Embodiment 1 of the present invention will be described. FIGS. 1-7 is the figure which showed the inside of the heating apparatus 10 by this embodiment transparently. FIG. 1 shows an assembled state, and FIGS. 2 to 7 show components (the scales are not the same between the drawings). The heating device 10 is installed in the engine room of the vehicle in a vertically upright state as shown in FIG. In FIG. 1, a heating device 10 concentrically accommodates a cylindrical small heating chamber 14 in an internal space 13 of a cylindrical heat-retaining hot water storage chamber 12, and a round bar-shaped electric heater in an internal space 15 of the small heating chamber 14. (Hereinafter referred to as “heater”) 16 is concentrically accommodated. The heater 16 and the small heating chamber 14 are concentrically attached to the lower surface of the lid 30, and the small heating chamber 14 containing the heater 16 is inserted into the internal space 13 from the upper opening 26 of the thermal insulation hot water storage chamber 12, so that the lid 30 is kept warm. The whole is integrated by being screwed into the upper part of the chamber 12 and screwed. The washer liquid is fed from the washer tank 72 (FIG. 8) through the hose 54 to the internal space 13 of the heat retaining hot water storage chamber 12, and through the throttle port 60 at the lower end surface of the small heating chamber 14. And is heated by the heater 16 here. The heated washer liquid is supplied to the washer nozzle 80 (FIG. 8) through the hose 56, and sprayed toward the wiper wiping range of the front window, the rear window, the headlamp with wiper, and the like. The capacity of the washer liquid stored in the internal space 13 of the heat insulation hot water storage chamber 12 (the volume of the internal space 13 of the heat insulation hot water storage chamber 12 excluding the volume of the small heat storage chamber 14) is stored in the internal space 15 of the small heat storage chamber 14. Is set to be sufficiently larger than the capacity of the washer liquid (the volume of the internal space 15 of the small heating chamber 14 excluding the volume of the heater 16).

  The heat insulation hot water storage chamber 12 has the same structure as a thermos bottle, and has a heat insulating wall surface 24 in which a vacuum layer 22 is formed between the inner wall 18 and the outer wall 20 as shown in FIG. The inner wall 18 is made of a metal such as stainless steel or glass having a metal layer plated on the surface on the vacuum layer 22 side. The outer wall 20 is made of a metal such as stainless steel. A lower end portion of the heat insulation hot water storage chamber 12 is closed, and an opening 26 is formed at the upper end portion. A screw 32 for screwing and attaching the lid 30 is formed on the outer peripheral surface of the wall portion 28 constituting the opening 26.

  The opening 26 of the heat insulation hot water storage chamber 12 is closed with a lid 30. The lid 30 is made of resin or the like, and includes a core portion 33 and an outer peripheral wall 34 surrounding the core portion 33 on the lower surface side as shown in FIG. A groove 36 that opens downward is formed between the core portion 33 and the outer peripheral wall 34. A screw 38 is formed on the inner peripheral surface of the outer peripheral wall 34. The groove 36 accommodates the sealing rubber (O-ring) 40 shown in FIG. The sealing rubber 40 is accommodated in the groove 36, the wall portion 28 of the opening 26 of the heat retaining hot water storage chamber 12 is inserted into the groove 36, the lid 30 is turned, the screws 32 and 38 are screwed together, and the screws 32 and 38 are tightly tightened. The opening 26 of the hot water storage chamber 12 is sealed with a lid 30. At this time, the core 33 is inserted into the opening 26.

  A wire lead-out path 44 (FIG. 3) for drawing out an electric wire 42 (FIG. 1) for supplying electric power to the heater 16 is formed on the central axis of the core portion 33 of the lid 30. When a lead wire (not shown) of a temperature sensor (not shown) that detects the temperature of the washer fluid in the internal space 15 of the small heating chamber 14 is drawn out to the outside, it can be drawn out using the wire lead-out path 44. . The core portion 33 is formed with a washer fluid inflow passage 46 through which the washer fluid flows into the heat retaining hot water storage chamber 12 from the outside, and a washer fluid outflow passage 48 through which the washer fluid in the small heating chamber 14 flows out. Since the washer liquid outflow path 48 is opened upward in the small heating chamber 14, even if the washer liquid in the washer tank 72 (FIG. 8) is emptied, the small heating chamber 14 is prevented from being emptied. Thus, the heater 16 can be prevented from being blown. Hose connection ports 50 and 52 communicating with the washer liquid inflow path 46 and the washer liquid outflow path 48 are formed on the upper surface of the lid 30 so as to protrude. Hoses 54 and 56 (FIG. 1) are inserted and connected to the hose connection ports 50 and 52.

  A round bar-shaped heater 16 (FIG. 1) is fixedly mounted on the lower surface central axis of the lid 30. The heater 16 is configured by enclosing a heating wire heater, a PTC ceramic heater or the like in a cylindrical case such as a metal pipe or a ceramic pipe. If a so-called auto heater having a temperature control function with a built-in temperature sensor is used as the heater 16, it is not necessary to separately install a temperature sensor in the small heating chamber 14. A small heating chamber 14 is fixedly attached to the lower surface of the lid 30 in a state where the heater 16 is accommodated in the internal space 15. The small heating chamber 14 is formed of a cylindrical member as shown in FIG. The small heating chamber 14 has an appropriate thermal conductivity, and is constituted by a non-insulating structure (structure having no vacuum layer) made of a material such as a resin such as hard vinyl chloride, ceramics, or metal. The upper end portion 14a of the small heating chamber 14 is closed by the lower surface of the lid 30, and the lower end portion 14b is closed by joining a disk-shaped lower lid 58 shown in FIG. The lower lid 58 can be made of the same material (resin, ceramics, metal, etc.) as the small heating chamber 14. A plurality of apertures 60 are formed in the lower lid 58. The washer liquid in the internal space 13 of the heat retaining hot water storage chamber 12 flows into the internal space 15 of the small heating chamber 14 through the throttle port 60.

  A disc-shaped movable diaphragm lid 61 is accommodated in the internal space 15 of the small heating chamber 14. The movable diaphragm lid 61 is made of a material such as hard vinyl chloride having a specific gravity slightly larger than that of the washer liquid. As shown in FIG. 7, the movable diaphragm lid 61 is formed in a disk shape, and a circular center hole 62 is formed at the center. The outer diameter of the movable diaphragm lid 61 is slightly smaller than the inner diameter of the small heating chamber 14, and the inner diameter of the center hole 62 is slightly larger than the outer diameter of the heater 16. The movable diaphragm cover 61 is accommodated in the internal space 15 of the small heating chamber 14 by inserting the heater 16 into the center hole 62, and is arranged so as to be movable up and down along the heater 16.

  FIG. 8 shows an electric system and a washer fluid supply system when the heating device 10 having the above configuration is added to an existing washer device. FIG. 8 shows a case where temperature control is performed using a machine-detection type temperature sensor made of a bimetal or a shape memory alloy installed in the small heating chamber 14 of the heating apparatus 10 or the like. A portion surrounded by a dotted line is a portion added to an existing washer device in order to use the heating device 10. The heater 16 and the washer motor 76 are driven using the battery 63 as a power source. In other words, the heater 16 and the mechanical detection type temperature sensor 64 are connected in series to the battery 63 via the ignition switch 66 and the relay switch 68. The mechanical detection type temperature sensor 64 is composed of a switch (mechanical thermostat) having a movable contact made of bimetal, shape memory alloy, or the like, and when the temperature of the washer liquid in the small heating chamber 14 is lower than a set temperature (for example, 60 ° C.). When the switch is turned on and the set temperature is exceeded, the switch is turned off. The timer circuit 70 turns on and off the relay switch 68. In order to reduce power consumption at the time of starting the ignition (during driving of the cell motor), the timer circuit 70 is turned on until a predetermined time (for example, several seconds) elapses after the ignition switch 66 is turned on. The relay switch 68 is kept off, and after the predetermined time has elapsed, the relay switch 68 is kept on until the ignition switch 66 is turned off. The washer tank 72 is filled with washer liquid. When the washer switch 74 is turned on by an operation of the driver or the like, the washer motor 76 is energized, whereby the washer pump 78 is driven, and the washer liquid in the washer tank 72 passes through the hose 54 to the heating device 10. Supplied. The washer liquid heated by the warming device 10 is supplied to the washer nozzle 80 through the hose 56 and injected.

FIG. 9 shows the operation of the heating device 10. Each process shown to (1)-(4) is demonstrated.
(1) A state when the washer switch 74 (FIG. 8) is turned on is shown. The washer liquid 82 fed from the washer tank 72 is injected into the upper space of the heat insulation hot water storage chamber 12 through the hose 54. Along with this, the washer fluid 82 in the heat retaining hot water storage chamber 12 descends and flows into the small heating chamber 14 from the throttle port 60 of the lower lid 58. At this time, the movable diaphragm lid 61 in the small heating chamber 14 is pushed up by the inflowing washer liquid 82. As a result, the warmed washer fluid 82 on the upper side of the movable diaphragm lid 61 is discharged from the warming device 10 via the hose 56 and sprayed from the washer nozzle 80.
(2) When the washer switch 74 is turned off, the supply of the washer fluid 82 from the washer tank 72 is stopped. Accordingly, the movable diaphragm lid 61 is lowered by its own weight. At this time, the washer fluid 82 below the movable diaphragm lid 61 moves to the upper side of the movable diaphragm lid 61 through the gap 84 between the outer circumferential surface of the movable diaphragm lid 61 and the inner circumferential surface of the small heating chamber 14. .
(3) Since energization to the heater 16 is continuously performed, the washer liquid 82 in the small heating chamber 14 is heated. Since the small heating chamber 14 has a small capacity, the washer liquid 82 in the small heating chamber 14 can be rapidly heated even if the output of the heater 16 is relatively small (that is, even with a relatively small current of, for example, about 5 amperes). it can. At this time, the movable throttle cover 61 lands on the lower lid 58 and closes the throttle opening 60 of the lower lid 58, so that the warm washer fluid 82 in the small heating chamber 14 passes through the throttle opening 60 and the heat retaining hot water storage chamber. Escape to the internal space 13 can be suppressed. When the washer liquid 82 in the small heating chamber 14 is warmed and the washer switch 74 is turned on again, the warmed washer liquid 82 is supplied to the washer nozzle 80 through the hose 56 and sprayed again by the step (1). .
(4) If the washer switch 74 is kept off in the above step (3), the heat of the washer liquid 82 in the small heating chamber 14 is transferred to the washer in the heat retaining hot water storage chamber 12 by the heat conduction of the wall surface of the small heating chamber 14. Heat is transferred to the liquid 82 and the washer liquid 82 in the heat retaining hot water storage chamber 12 is heated. When the temperature of the washer liquid 82 in the small heating chamber 14 exceeds the set temperature (for example, 60 ° C.) of the mechanical detection type temperature sensor 64 (FIG. 8), the mechanical detection type temperature sensor 64 is turned off and the heater 16 is energized. Stopped. Since the heat insulation hot water storage chamber 12 has a heat insulating structure, the washer liquid 82 in the heating device 10 is kept warm even when the energization to the heater 16 is stopped. When the temperature of the washer liquid 82 in the small heating chamber 14 falls below a predetermined value, energization to the heater 16 is resumed, and thereafter energization / stop of the heater 16 is repeated until the ignition switch 66 is turned off. When the ignition switch 66 is turned off, the energization to the heater 16 is also stopped. However, since the heat retaining hot water storage chamber 12 has a heat insulating structure, the washer fluid 82 in the warming device 10 is kept warm for a long time.

《Experimental example》
The warming device 10 is prototyped and water is filled in the small heating chamber 14 and the heat-retaining hot water storage chamber 12 and the heater 16 is continuously energized. The temperature drop characteristic (heat retention characteristic) of the water in the temperature apparatus 10 was measured. The prototype of the heating apparatus 10 was produced using the following parts.
・ Insulated hot water storage chamber 12: Uses a commercially available thermos-type water bottle body as it is. ・ Lid 30: Remodels the cover of the thermos-type water tube used in the hot-water storage hot water chamber 12. -Small heating chamber 14: Rigid polyvinyl chloride tube. Vinyl plate / movable diaphragm lid 61: hard vinyl chloride plate / heater 16: heating wire heater (output 60 watts)
The total amount of water in the heating device 10 (the total amount of water charged in the small heating chamber 14 and the hot water storage chamber 12) is 485 ml, and the capacity of the small heating chamber 14 is 50 ml. The initial temperature of water in the temperature increase experiment (FIGS. 10 and 11) was 14 ° C., and the initial temperature of water in the heat retention characteristic experiment (FIG. 12) was 60 ° C.

  FIG. 10 shows the temperature change of the water in the small heating chamber 14 after the heater 16 is energized. According to this, it reached 85 ° or more in about 5 minutes after the start of energization. FIG. 11 shows a change in the rising temperature of the water in the heat retaining hot water storage chamber 12 (the rising temperature with respect to the initial temperature of 14 ° C.). According to this, a temperature increase of 70 ° or more occurs 40 minutes after the start of energization.

  FIG. 12 shows the temperature change of the water in the heating device 10 when the temperature of the water in the heating device 10 is set to 60 ° C. and the energization to the heater 16 is kept stopped. It measured about each case where external temperature is -5 degreeC, -10 degreeC, -15 degreeC, -20 degreeC, -25 degreeC, and -30 degreeC. According to this, the water temperature after the lapse of 10 hours is 27 ° C. when the outside air temperature is −5 ° C., and 13 ° C. when the outside air temperature is −30 ° C. Therefore, for example, when the vehicle is driven and returned home at night, the water temperature can still be kept warm at the start of the next morning, and the time and power required for the temperature increase at the start can be suppressed.

<< Embodiment 2 >>
Embodiment 2 of the present invention will be described. FIG. 13 is a view schematically showing the heating device 86 according to this embodiment as seen through the inside. The heating device 86 has a lid 30 fitted with the small heating chamber 14 and the heater 16 arranged on the lower side, thereby improving the heat insulation of the upper part where the high-temperature washer liquid is accumulated, so that heat can escape from the upper part. And the heat retention performance is further improved. The same reference numerals are used for portions common to the first embodiment. The heating device 86 is installed in the engine room of the vehicle in a vertically standing state as shown in FIG. The heating device 86 concentrically accommodates a small heating chamber 14 which is cylindrical and has an appropriate thermal conductivity in the inner space 13 of the heat insulating hot water storage chamber 12 having a cylindrical and heat insulating structure. A round bar-shaped heater 16 is concentrically accommodated. The heater 16 and the small heating chamber 14 are attached to the lower surface of the lid 30, and the heater 16 and the small heating chamber 14 are inserted into the internal space 13 from the lower opening 26 of the heat retaining hot water storage chamber 12, and the lid 30 is placed below the heat retaining hot water storage chamber 12. The whole is integrated by screwing it firmly on. The washer liquid is fed from the washer tank 72 (FIG. 8) through the hose 54 to the internal space 13 of the heat retaining hot water storage chamber 12, and through the throttle port 60 at the lower end surface of the small heating chamber 14. Here, it is heated by the heater 16, is sent to the washer nozzle 80 (FIG. 8) through the hose 56, and is sprayed toward the wiper wiping range in the front window, the rear window, the headlamp, and the like. The capacity of the washer liquid stored in the internal space 13 of the heat insulation hot water storage chamber 12 (the volume of the internal space 13 of the heat insulation hot water storage chamber 12 excluding the volume of the small heat storage chamber 14) is stored in the internal space 15 of the small heat storage chamber 14. Is set to be sufficiently larger than the capacity of the washer liquid (the volume of the internal space 15 of the small heating chamber 14 excluding the volume of the heater 16).

  The lid 30 has an electric wire 42 for supplying power to the heater 16, an inflow pipe (washer liquid inflow path) 88 for injecting washer liquid into the upper part of the internal space 13 of the heat insulation hot water storage chamber 12, and an upper part of the internal space 15 of the small heating chamber 14. An outflow pipe (washer liquid outflow passage) 90 for allowing the warmed washer liquid to flow out is installed in a watertight state. A temperature sensor 92 is disposed in the internal space 15 of the small heating chamber 14. The lead wire 94 of the temperature sensor 92 penetrates the lid 30 in a watertight manner and is drawn to the outside. Instead of disposing the temperature sensor 92 independently, a so-called auto heater having a temperature control function and a built-in temperature sensor may be used as the heater 16.

  As with the heating device 10 of the first embodiment, the heating device 86 can be used by configuring the electric system and the washer fluid supply system of FIG. 8 and operating as shown in FIG. That is, when the heater 16 is energized, the washer liquid in the small heating chamber 14 is heated, and the heat is further transferred to the washer liquid in the heat retaining hot water storage chamber 12 by heat conduction of the wall surface of the small heating chamber 14. The washer liquid in the heat insulation hot water storage chamber 12 is heated. When the washer switch 74 (FIG. 8) is turned on, the washer liquid fed from the washer tank 72 (FIG. 8) is supplied to the upper portion of the internal space 13 of the heat retaining hot water storage chamber 12 through the inflow pipe 88. , And flows into the small heating chamber 14 from the throttle port 60 of the lower lid 58. At this time, the movable diaphragm lid 61 in the small heating chamber 14 is pushed up by the inflowing washer liquid. As a result, the warmed washer liquid on the upper side of the movable throttle cover 61 is discharged from the heating device 86 through the outflow pipe 90 from the upper part of the small heating chamber 14, and is sprayed from the washer nozzle 80 (FIG. 8). Since the outflow pipe 90 constituting the washer liquid outflow path 48 is opened upward in the small heating chamber 14, even if the washer liquid in the washer tank 72 (FIG. 8) becomes empty, the inside of the small heating chamber 14 remains. It is prevented that the heater 16 becomes empty, and the heater 16 can be prevented from being blown. Other operations are the same as those described in the first embodiment.

  In the first and second embodiments, the movable diaphragm lid 61 is lowered by its own weight, but a weak spring 96 is fitted to the heater 16 as shown by a two-dot chain line in FIGS. A force (extension force) is applied to the movable diaphragm lid 61, and the movable diaphragm lid 61 is lowered by the extension force of the spring 96 (or by the combined force of the extension force of the spring 96 and the weight of the movable diaphragm lid 61). You can also. In the first and second embodiments, the movement of the washer fluid from the lower side to the upper side of the movable diaphragm lid 61 when the movable diaphragm lid 61 is lowered is caused by the outer peripheral surface of the movable diaphragm lid 61 and the small heating chamber 14. Although it was performed through the gap 84 with the inner peripheral surface, it was separately formed in the gap between the outer peripheral surface of the heater 16 and the center hole 62 of the movable diaphragm lid 61 and in the plane of the movable diaphragm lid 61. You may make it carry out through voids, such as a hole with a valve (a valve is arrange | positioned so that it may open when it closes and descends when the movable aperture lid 61 raises), and a notch. In the first and second embodiments, a water level sensor may be disposed in the small heating chamber 14 so that the heater 16 is energized on condition that the water level in the small heating chamber 14 is equal to or higher than a predetermined value. . In the first and second embodiments, as shown in FIG. 8, the washer fluid is fed using the existing washer pump 78 attached to the washer tank 72. When the road resistance increases and the washer fluid is not sprayed from the washer nozzle 80 with sufficient momentum, a washer pump is added to the heating device and the washer fluid is fed by driving the two washer pumps in series. It can also be done.

  DESCRIPTION OF SYMBOLS 10 ... Warming device, 12 ... Thermal insulation hot water storage chamber, 13 ... Internal space of thermal insulation hot water storage chamber, 14 ... Small heating chamber, 15 ... Internal space of small heating chamber, 16 ... Electric heater, 18 ... Inner wall of thermal insulation hot water storage chamber, DESCRIPTION OF SYMBOLS 20 ... Outer wall of heat insulation hot water storage room, 22 ... Vacuum layer, 24 ... Wall surface of heat insulation hot water storage room (wall surface of heat insulation structure), 26 ... Opening part of heat insulation hot water storage room, 30 ... Cover, 44 ... Electric wire extraction path, 46 ... Washer liquid Inflow path, 48 ... washer liquid outflow path, 58 ... lower lid (plate material on which the throttle port is formed), 60 ... lower lid throttle port, 61 ... movable throttle lid, 62 ... central hole of the movable throttle lid, 72 ... Washer tank, 78 ... Washer pump, 80 ... Washer nozzle, 82 ... Washer liquid, 84 ... Gap between the outer peripheral surface of the movable throttle cover and the inner peripheral surface of the small heating chamber, 86 ... Warming device, 88 ... Inflow pipe (Washer liquid inflow path), 9 ... outflow pipe (washer fluid outflow path), 92 ... temperature sensor, 96 ... spring

Claims (6)

A device that is disposed between a washer tank and a washer nozzle of a vehicle-mounted washer device, heats the washer liquid fed from the washer tank, and sends it to the washer nozzle,
A heat insulating hot water storage chamber having a heat insulating wall surface in which a vacuum layer is formed between an inner wall and an outer wall, and a washer liquid flowing out of the washer tank by driving a washer pump flows into the internal space;
A small-sized wall having a higher thermal conductivity than the wall surface of the heat insulation hot water storage chamber, accommodated in the internal space of the heat insulation hot water storage chamber, and allowing the washer liquid in the heat insulation hot water storage chamber to flow into the internal space by driving the washer pump A heating chamber;
An electric heater that is housed and arranged in the internal space of the small heating chamber, and that heats the washer fluid in the small heating chamber;
The internal space of the heat retaining hot water chamber is set to a size that can accommodate a larger volume of washer fluid than the internal space of the small heating chamber,
A washer fluid warming device in which warmed washer fluid flowing out of the small heating chamber is supplied to the washer nozzle by driving the washer pump. The heat insulation hot water storage chamber has an opening communicating from the external space to the internal space,
A small heating chamber containing the electric heater is attached to the lid that closes the opening,
The washer liquid heating apparatus according to claim 1, wherein the small heating chamber is inserted through the opening and accommodated in the internal space of the heat retaining hot water storage chamber, and the opening is closed with the lid. The lid is
A washer fluid inflow passage for allowing the washer fluid to flow into the heat retaining hot water storage chamber from the outside;
A washer liquid outflow passage for flowing out the washer liquid in the small heating chamber;
The washer liquid heating device according to claim 2, further comprising: a wire lead-out path for drawing out an electric wire for supplying electric power to the electric heater. The small heating chamber is formed in a cylindrical shape extending in the vertical direction,
It further has a plate-like movable diaphragm lid accommodated in the internal space of the small heating chamber,
The electric heater is in the shape of a rod and is disposed along the central axis of the cylinder of the small heating chamber,
The movable diaphragm lid has a center hole, and is arranged so as to be movable up and down along the electric heater through the electric heater in the central hole.
The movable diaphragm lid is pushed up by a washer liquid flowing from the lower part of the internal space to cause the washer liquid on the upper side of the movable diaphragm lid to flow out of the small heating chamber, and when the inflow of the washer liquid stops, its own weight and / or The movable washer is lowered by a spring force, and when it is lowered, the washer liquid on the lower side of the movable diaphragm lid is removed from the gap between the inner surface of the small heating chamber and the movable diaphragm lid, the outer surface of the electric heater and the movable The movable diaphragm lid is moved to the upper side of the movable diaphragm lid through at least one of a gap between the inner surface of the center hole of the movable diaphragm lid and a void formed in the surface of the movable diaphragm lid. 3. The washer fluid heating device according to 3.   The bottom portion of the cylinder of the small heating chamber is closed with a plate material in which a throttle port is formed, and the washer liquid in the internal space of the heat retaining hot water storage chamber is caused to flow into the internal space of the small heating chamber through the throttle port. The washer fluid heating device described.   The washer liquid has a flow path for the washer liquid that flows into the internal space from the upper part of the heat insulation hot water storage chamber and descends, and the lowered washer liquid flows into the internal space from the lower part of the small heating chamber and rises. Item 6. The washer liquid heating device according to Item 4 or 5.

Images