WASHER FLUID WARMING DEVICE
A warming device capable of quickly increasing a temperature of a washer fluid with a relatively-low current, warming a relatively-large volume of washer fluid, and further retaining a washer fluid in a warmed state for some time after a power supply is turned off is provided. A warming device includes a structure in which a small heating chamber is housed in an inner space of a heat-retaining hot fluid storage chamber and an electric heater is housed in an inner space of the small heating chamber. The heat-retaining hot fluid storage chamber has a heat-insulating structure. The small heating chamber has a moderate thermal conductivity. A washer fluid fed from a washer tank is supplied to the small heating chamber through the heat-retaining hot fluid storage chamber, warmed by the heater and ejected from a washer nozzle.
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The disclosure of Japanese Patent Application No. JP2011-005277 filed on Jan. 13, 2011 including the specification, drawings, claims and abstract is incorporated herein by reference in its entirety.
BACKGROUND OF THE INVENTION1. Field of the Invention
The present invention relates to a device arranged between a washer tank and a washer nozzle in a washer apparatus on board a vehicle, the device warming a washer fluid via an electric heater and being configured so as to be capable of quickly increasing a temperature of a washer fluid with a relatively-low current, warming a relatively-large volume of washer fluid, and furthermore, retaining a washer fluid in a warmed state for some time after a power supply being turned off, enabling reduction of power required for increasing the temperature of the washer fluid when the power supply is turned on next time.
2. Description of the Related Art
For washer fluid warming devices, there have been provided, e.g., those that use engine waste heat (Japanese Patent Laid-Open No. 2002-264779), and those that use an electric heater (Japanese Utility Model Laid-Open No. 6-27391).
A washer fluid warming device is particularly expected for use for frost removal in a cold winter; however, those that use engine waste heat have the problem of requiring long time to warm a washer fluid from engine starting. Meanwhile, those that use an electric heater require a large current (40 amperes or more) for quickly increasing the temperature of a washer fluid, causing problems such as overusing a battery already weakened by a low temperature and requiring, e.g., a large relay having thick electric wires and large contacts as well as transistor devices, resulting in a cost increase.
The present invention has been made in view of the aforementioned points, and an object of the present invention is to provide a washer fluid warming device capable of quickly increasing a temperature of a washer fluid with a relatively-low current, warming a relatively-large volume of washer fluid, and furthermore, retaining a washer fluid in a warmed state for some time after a power supply is turned off, enabling reduction of power required for increasing the temperature of the washer fluid when the power supply is turned on next time.
SUMMARY OF THE INVENTIONThe present invention provides a washer fluid warming device arranged between a washer tank and a washer nozzle in a washer apparatus on board a vehicle, the washer fluid warming device warming a washer fluid sent in from the washer tank and sending the washer fluid out to the washer nozzle, the device including: a heat-retaining hot fluid storage chamber including a wall having a heat-insulating structure in which a vacuum layer is provided between an inner wall and an outer wall and including an inner space into which the washer fluid flowing out of the washer tank flows as a result of a washer pump being driven; a small heating chamber including a wall having a thermal conductivity higher than that of the wall of the heat-retaining hot fluid storage chamber, being housed in the inner space of the heat-retaining hot fluid storage chamber, and further including an inner space into which the washer fluid in the heat-retaining hot fluid storage chamber flows as a result of the washer pump being driven; and an electric heater housed in the inner space of the small heating chamber, the electric heater warming the washer fluid in the small heating chamber, wherein the inner space of the heat-retaining hot fluid storage chamber is set to have a size capable of accommodating a volume of washer fluid that is larger than a volume of washer fluid that can be accommodated by the inner space of the small heating chamber; and wherein the warmed washer fluid flowing out of the small heating chamber is supplied to the washer nozzle as a result of the washer pump being driven.
According to the present invention, upon power being supplied to the electric heater, a washer fluid in the small heating chamber can be warmed and ejected from the washer nozzle. The small heating chamber accommodates a volume of washer fluid that is smaller than a volume of washer fluid that can be accommodated by the heat-retaining hot fluid storage chamber, and thus, the temperature of the washer fluid in the small heating chamber can quickly be increased without using a large current. When the washer fluid is not ejected, the washer fluid in the heat-retaining hot fluid storage chamber can be warmed by means of thermal conduction via the wall of the small heating chamber. Since the heat-retaining hot fluid storage chamber has a heat-insulating structure, the washer fluid can be retained in a warmed state for some time after a power supply is turned off, enabling reduction of power required for increasing the temperature of the washer fluid when the power supply is turned on next time.
In the present invention, it is possible that: the heat-retaining hot fluid storage chamber includes an opening that provides communication between an outer space and the inner space thereof; the small heating chamber with the electric heater housed therein is attached to a lid that occludes the opening; and the small heating chamber is inserted into the inner space of the heat-retaining hot fluid storage chamber from the opening and thereby housed in the inner space of the heat-retaining hot fluid storage chamber and the opening is occluded by the lid. Consequently, a simple configuration can be provided, enabling easy assembly. Also, it is possible that: the lid includes a washer fluid inflow channel that allows the washer fluid to flow from the outside into the heat-retaining hot fluid storage chamber, a washer fluid outflow channel that allows the washer fluid in the small heating chamber to flow out to the outside, and an electric wire leading channel that allows an electric wire for supplying power to the electric heater to be led to the outside. Consequently, the necessity for the washer fluid inflow channel, the washer fluid outflow channel and the electric wire leading channel to be formed in the heat-retaining hot fluid storage chamber can be eliminated, providing a simple configuration and thus enabling easy assembly.
In the present invention, it is possible that: the small heating chamber is formed in a tubular shape extending in a vertical direction; the washer fluid warming device further includes a plate-shaped movable throttle lid housed in the inner space of the small heating chamber; the electric heater has a stick-like shape and is arranged along a central axis of the tubular small heating chamber; the movable throttle lid includes a central hole, and the electric heater is inserted through the central hole and arranged so that the movable throttle lid can ascend/descend along the electric heater, and upon the movable throttle lid being pushed up by the washer fluid flowing in from a lower portion of the inner space of the small heating chamber, the movable throttle lid makes the washer fluid on an upper side of the movable throttle lid flow out of the small heating chamber, and upon the inflow of the washer fluid being stopped, the movable throttle lid descends by its own weight and/or a spring force, and during the descent, the washer fluid on a lower side of the movable throttle lid is moved to the upper side of the movable throttle lid via at least any one of a gap between an inner face of the small heating chamber and the movable throttle lid, a gap between an outer face of the electric heater and an inner face of the central hole of the movable throttle lid, and a void formed within a face of the movable throttle lid. Consequently, when a washer fluid is ejected from the washer nozzle, the washer fluid warmed on the upper side of the movable throttle lid in the small heating chamber, which is to be supplied to the washer nozzle, and the washer fluid flowing in from the lower portion of the small heating chamber, which is not warmed yet, can be prevented from being mixed, as a result of the movable throttle lid functioning as a partition, enabling the warm washer fluid to be ejected from the washer nozzle.
In the present invention, it is possible that a bottom of the tubular small heating chamber is occluded by a plate material in which a throttle port is formed, through which the washer fluid in the inner space of the heat-retaining hot fluid storage chamber flows into the inner space of the small heating chamber. Consequently, it is possible to prevent a warmed washer fluid in the small heating chamber from flowing out from the lower portion of the small heating chamber. Furthermore, in the present invention, it is possible that the washer fluid warming device further includes a washer fluid flow passage in which the washer fluid flows into the inner space of the heat-retaining hot fluid storage chamber from an upper portion of the heat-retaining hot fluid storage chamber and descends in the inner space of the heat-retaining hot fluid storage chamber, and the washer fluid that has descended flows into the inner space of the small heating chamber from a lower portion of the small heating chamber and ascends in the inner space of the small heating chamber. Consequently, it is possible to provide a favorable flow of a washer fluid in the warming device. Furthermore, in the present invention, the heat-retaining hot fluid storage chamber and the small heating chamber can be formed in, for example, respective tubular shapes concentric to each other. Consequently, the warming device can have a compact structure, and thus can be installed in a narrow space such as an engine room of a vehicle.
A first embodiment of the present invention will be described.
The heat-retaining hot fluid storage chamber 12 has a structure similar to that of a vacuum bottle, and as illustrated in
The opening 26 of the heat-retaining hot fluid storage chamber 12 is closed by the lid 30. The lid 30 is made of, e.g., a resin, and as illustrated in
An electric wire leading channel 44 (
The round bar-shaped heater 16 (
A discoid movable throttle lid 61 is housed in the inner space 15 of the small heating chamber 14. The movable throttle lid 61 is made of a material, such as a hard vinyl chloride resin, having a specific gravity that is somewhat larger than that of the washer fluid. As illustrated in
(1) A state in which the washer switch 74 (
(2) Upon the washer switch 74 being turned off, the supply of the washer fluid 82 from the washer tank 72 is stopped. Consequently, the movable throttle lid 61 descends by means of its own weight. Here, the washer fluid 82 on the lower side of the movable throttle lid 61 moves to the upper side of the movable throttle lid 61 via a gap 84 between an outer periphery of the movable throttle lid 61 and an inner periphery of the small heating chamber 14.
(3) Since the power supply to the heater 16 is continued, the washer fluid 82 in the small heating chamber 14 is warmed. Since the small heating chamber 14 has a small volumetric capacity, even if an output of the heater 16 is relatively small (that is, a relatively small current of, for example, around five amperes), a temperature of the washer fluid 82 in the small heating chamber 14 can quickly be increased. Furthermore, here, the movable throttle lid 61 occludes the throttle ports 60 of the lower lid 58 as a result of landing on the lower lid 58, enabling the warmed washer fluid 82 in the small heating chamber 14 to be prevented from flowing out to the inner space 13 of the heat-retaining hot fluid storage chamber 12 through the throttle ports 60. Upon the washer fluid 82 in the small heating chamber 14 being warmed and the washer switch 74 being turned on again, the warmed washer fluid 82 is supplied to the washer nozzle 80 through the hose 56 and ejected again through step (1) above.
(4) If the washer switch 74 is left off in step (3) above, heat of the washer fluid 82 in the small heating chamber 14 is conducted to the washer fluid 82 in the heat-retaining hot fluid storage chamber 12 by means of thermal conduction via a wall of the small heating chamber 14, whereby the washer fluid 82 in the heat-retaining hot fluid storage chamber 12 is warmed. When the temperature of the washer fluid 82 in the small heating chamber 14 exceeds a set temperature (for example, 60 deg C.) of the mechanical sensing-type temperature sensor 64 (
A prototype of the warming device 10 is fabricated, and a temperature increase characteristic of water when the small heating chamber 14 and the heat-retaining hot fluid storage chamber 12 are filled with the water and power is continuously supplied to the heater 16, and a temperature decrease characteristic (heat-retaining characteristic) of the water in the warming device 10 after the power supply to the heater 16 is stopped were measured. The prototype of the warming device 10 was fabricated using the following parts.
Heat-retaining hot fluid storage chamber 12: a body of a commercially-available vacuum water bottle was used as it is.
Lid 30: a lid of the vacuum water bottle used for the heat-retaining hot fluid storage chamber 12 was modified and used.
Small heating chamber 14: a hard vinyl chloride resin tube
Lower lid 58: a hard vinyl chloride resin plate
Movable throttle lid 61: a hard vinyl chloride resin plate
Heater 16: electrical heating wire-used heater (output of 60 watts)
A total amount of the water in the warming device 10 (a sum of amounts of water charged in the small heating chamber 14 and the heat-retaining hot fluid storage chamber 12) was 485 ml, and the small heating chamber 14 has a volumetric capacity of 50 ml. An initial temperature of the water in a temperature increase test (
A second embodiment of the present invention will be described.
An electric wire 42 for supplying power to the heater 16, an inflow pipe (washer fluid inflow channel) 88 for injecting the washer fluid to an upper portion of the inner space 13 of the heat-retaining hot fluid storage chamber 12, and an outflow pipe (washer fluid outflow channel) 90 that allows the warmed washer fluid in an upper portion of the inner space 15 of the small heating chamber 14 to flow out to the outside penetrate the lid 30 and are attached to the lid 30 in a watertight state. A temperature sensor 92 is provided inside the inner space 15 of the small heating chamber 14. A lead wire 94 for the temperature sensor 92 watertightly penetrates the lid 30 and is led to the outside. Instead of providing the temperature sensor 92 independently, what is called an auto heater including a temperature sensor therein and having a temperature control function can be used as the heater 16.
As with the warming device 10 according to the first embodiment, the warming device 86 can be included in the electrical system and the washer fluid feeding system in
Although in the first and second embodiments, the movable throttle lid 61 descends by means of its own weight, as illustrated in an alternate long and two short dashes line in
Claims
1. A washer fluid warming device arranged between a washer tank and a washer nozzle in a washer apparatus on board a vehicle, the washer fluid warming device warming a washer fluid sent in from the washer tank and sending the washer fluid out to the washer nozzle, the device comprising:
- a heat-retaining hot fluid storage chamber including a wall having a heat-insulating structure in which a vacuum layer is provided between an inner wall and an outer wall and including an inner space into which the washer fluid flowing out of the washer tank flows as a result of a washer pump being driven;
- a small heating chamber including a wall having a thermal conductivity higher than that of the wall of the heat-retaining hot fluid storage chamber, being housed in the inner space of the heat-retaining hot fluid storage chamber, and further including an inner space into which the washer fluid in the heat-retaining hot fluid storage chamber flows as a result of the washer pump being driven; and
- an electric heater housed in the inner space of the small heating chamber, the electric heater warming the washer fluid in the small heating chamber,
- wherein the inner space of the heat-retaining hot fluid storage chamber is set to have a size capable of accommodating a volume of washer fluid that is larger than a volume of washer fluid that can be accommodated by the inner space of the small heating chamber; and
- wherein the warmed washer fluid flowing out of the small heating chamber is supplied to the washer nozzle as a result of the washer pump being driven.
2. The washer fluid warming device according to claim 1,
- wherein the heat-retaining hot fluid storage chamber includes an opening that provides communication between an outer space and the inner space thereof;
- wherein the small heating chamber with the electric heater housed therein is attached to a lid that occludes the opening; and
- wherein the small heating chamber is inserted into the inner space of the heat-retaining hot fluid storage chamber from the opening and thereby housed in the inner space of the heat-retaining hot fluid storage chamber and the opening is occluded by the lid.
3. The washer fluid warming device according to claim 2,
- wherein the lid includes:
- a washer fluid inflow channel that allows the washer fluid to flow from the outside into the heat-retaining hot fluid storage chamber;
- a washer fluid outflow channel that allows the washer fluid in the small heating chamber to flow out to the outside; and
- an electric wire leading channel that allows an electric wire for supplying power to the electric heater to be led to the outside.
4. The washer fluid warming device according to claim 2,
- wherein the small heating chamber is formed in a tubular shape extending in a vertical direction;
- wherein the washer fluid warming device further includes a plate-shaped movable throttle lid housed in the inner space of the small heating chamber;
- wherein the electric heater has a stick-like shape and is arranged along a central axis of the tubular small heating chamber;
- wherein the movable throttle lid includes a central hole, and the electric heater is inserted through the central hole and arranged so that the movable throttle lid can ascend/descend along the electric heater, and
- wherein upon the movable throttle lid being pushed up by the washer fluid flowing in from a lower portion of the inner space of the small heating chamber, the movable throttle lid makes the washer fluid on an upper side of the movable throttle lid flow out of the small heating chamber, and upon the inflow of the washer fluid being stopped, the movable throttle lid descends by its own weight and/or a spring force, and during the descent, the washer fluid on a lower side of the movable throttle lid is moved to the upper side of the movable throttle lid via at least any one of a gap between an inner face of the small heating chamber and the movable throttle lid, a gap between an outer face of the electric heater and an inner face of the central hole of the movable throttle lid, and a void formed within a face of the movable throttle lid.
5. The washer fluid warming device according to claim 3,
- wherein the small heating chamber is formed in a tubular shape extending in a vertical direction;
- wherein the washer fluid warming device further includes a plate-shaped movable throttle lid housed in the inner space of the small heating chamber;
- wherein the electric heater has a stick-like shape and is arranged along a central axis of the tubular small heating chamber;
- wherein the movable throttle lid includes a central hole, and the electric heater is inserted through the central hole and arranged so that the movable throttle lid can ascend/descend along the electric heater, and
- wherein upon the movable throttle lid being pushed up by the washer fluid flowing in from a lower portion of the inner space of the small heating chamber, the movable throttle lid makes the washer fluid on an upper side of the movable throttle lid flow out of the small heating chamber, and upon the inflow of the washer fluid being stopped, the movable throttle lid descends by its own weight and/or a spring force, and during the descent, the washer fluid on a lower side of the movable throttle lid is moved to the upper side of the movable throttle lid via at least any one of a gap between an inner face of the small heating chamber and the movable throttle lid, a gap between an outer face of the electric heater and an inner face of the central hole of the movable throttle lid, and a void formed within a face of the movable throttle lid.
6. The washer fluid warming device according to claim 4, wherein a bottom of the tubular small heating chamber is occluded by a plate material in which a throttle port is formed, through which the washer fluid in the inner space of the heat-retaining hot fluid storage chamber flows into the inner space of the small heating chamber.
7. The washer fluid warming device according to claim 5, wherein a bottom of the tubular small heating chamber is occluded by a plate material in which a throttle port is formed, through which the washer fluid in the inner space of the heat-retaining hot fluid storage chamber flows into the inner space of the small heating chamber.
8. The washer fluid warming device according to claim 4, further comprising a washer fluid flow passage in which the washer fluid flows into the inner space of the heat-retaining hot fluid storage chamber from an upper portion of the heat-retaining hot fluid storage chamber and descends in the inner space of the heat-retaining hot fluid storage chamber, and the washer fluid that has descended flows into the inner space of the small heating chamber from a lower portion of the small heating chamber and ascends in the inner space of the small heating chamber.
9. The washer fluid warming device according to claim 5, further comprising a washer fluid flow passage in which the washer fluid flows into the inner space of the heat-retaining hot fluid storage chamber from an upper portion of the heat-retaining hot fluid storage chamber and descends in the inner space of the heat-retaining hot fluid storage chamber, and the washer fluid that has descended flows into the inner space of the small heating chamber from a lower portion of the small heating chamber and ascends in the inner space of the small heating chamber.
10. The washer fluid warming device according to claim 6, further comprising a washer fluid flow passage in which the washer fluid flows into the inner space of the heat-retaining hot fluid storage chamber from an upper portion of the heat-retaining hot fluid storage chamber and descends in the inner space of the heat-retaining hot fluid storage chamber, and the washer fluid that has descended flows into the inner space of the small heating chamber from a lower portion of the small heating chamber and ascends in the inner space of the small heating chamber.
11. The washer fluid warming device according to claim 7, further comprising a washer fluid flow passage in which the washer fluid flows into the inner space of the heat-retaining hot fluid storage chamber from an upper portion of the heat-retaining hot fluid storage chamber and descends in the inner space of the heat-retaining hot fluid storage chamber, and the washer fluid that has descended flows into the inner space of the small heating chamber from a lower portion of the small heating chamber and ascends in the inner space of the small heating chamber.
Type: Application
Filed: Dec 6, 2011
Publication Date: Jul 19, 2012
Applicant: MURAKAMI CORPORATION (Shizuoka-city)
Inventors: Hidenori SATO (Fujieda-city), Masaki KOBAYASHI (Fujieda-city)
Application Number: 13/311,751
International Classification: F24H 1/18 (20060101);