JP3680831B2 - Electric water heater - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an electric water heater used in a general home or office, and more particularly to an electric water heater provided with a water storage tank in addition to a water heater container.
[0002]
[Prior art]
Conventionally, as this kind of electric water heater, a water storage tank is arranged at the bottom of the water heater container, and when the water in the water heater container is reduced to a predetermined amount, it is detected and water supply that connects the water heater container and the water storage tank. The water in the water storage tank was automatically replenished to the container through a pipe. (For example, refer to Patent Document 1).
[0003]
[Patent Document 1]
JP-A-5-293046 [0004]
[Problems to be solved by the invention]
However, in the conventional configuration, when the control base is inundated by water that has entered the main body, the control circuit becomes abnormal, the water supply pump is continuously operated regardless of the amount of water in the container, and the main body is When water was continuously supplied into the container and more water was supplied than the rated water amount, there was a problem that when the water was boiled there, the hot water spilled out from the steam port or outlet port provided on the lid above the main body water-bathing container.
[0005]
The present invention solves the above-mentioned conventional problems, even when the water supply pump is in a continuous operation state with a simple configuration so that the water level in the main body container does not rise above a certain level, and the water is heated in that state. However, an object of the present invention is to provide an electric water heater in which the internal pressure in the water heater container is prevented from rising by allowing the steam to be discharged, so that hot water does not spill out from the steam port or the hot water outlet.
[0006]
[Means for Solving the Problems]
In order to solve the above-described conventional problems, the electric water heater of the present invention is provided with a water heater container and a water storage tank, and when water is supplied from the water storage tank to the water heater container, water is supplied to a water inlet provided at the upper part of the water storage tank. A part or all of the liquid was led to a water supply path connecting the water storage tank and the water heater container, and supplied into the water heater container from the water supply port.
[0007]
Furthermore, when the water supply pump is in a continuous operation state, the water level in the kettle container is prevented from rising above a predetermined water level by overflowing from the inlet, and a steam vent provided in the lid Is provided above a predetermined level above the predetermined water level, so that steam can be discharged even when boiling in that state, thereby suppressing an increase in internal pressure in the kettle, The hot water does not spill from the outlet.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
The invention described in claim 1 is a water storage tank that stores liquid, a water heater container that is provided in a main body and that stores and heats liquid, a lid that covers the top of the water heater container, and a water tank that stores liquid in the water tank. A water supply path for sending to the container, a water supply means for supplying the liquid in the water storage tank to an inlet provided in the upper part of the water storage tank, and a lead-out path for taking out the liquid in the kettle container outside the container And a part or all of the liquid fed to the inlet is led to the water supply channel and supplied into the water heater container, and the steam vent hole provided on the water heater container side of the lid is the injection hole. It was provided above the overflow part provided at the inlet, and the highest water level point of the outlet path was provided above the steam vent.
[0009]
With this configuration, when the water supply pump is in continuous operation, if the water level in the water heater container becomes the same level as the inlet, liquid overflows from the inlet into the water supply tank, so the water level in the water heater container is poured. Since it rises only to the height of the inlet, even if it is heated in that state, it will flow out of the body through the steam vent from the steam vent provided in the lid of the water heater container, so the internal pressure in the water heater container will rise. It is possible to prevent spillage from the steam outlet or the steam port provided in the lid.
[0010]
The invention according to claim 2 provides a steam passage by providing a plurality of steam vent holes so that it is difficult to block all the steam vent holes at the same time with the momentum of boiling water in the water heater container. It is possible to prevent the internal pressure in the container from rising and spilling from the outlet port or the steam port provided in the lid.
[0011]
【Example】
Embodiments of the present invention will be described below with reference to FIGS.
[0012]
(Example 1)
A first embodiment of the present invention will be described with reference to FIG. In the main body, a water heater 1, a lid 7, a control unit 10, a water supply path 17, a lead-out path 5, a pump 4, a water supply pump drive motor 13 a and a water level sensor 9 are provided. A water storage tank 11 is detachably attached to the water heater 1. In the water storage tank 11, there are provided water supply means 12 having a water supply pump 13 and a pumping path 14, a water receiving portion 15 formed around an inlet 16 communicating with the outside of the water storage tank 11, a tank valve, and a water level stopper 22. Is provided.
[0013]
A tank valve 19 made of a soft rubber such as silicone rubber is provided at the inlet 16 so as to be urged by a spring and always close the inlet 16. This prevents water from spilling from the inlet 16 due to vibration when water is supplied to the water storage tank 11 and transported.
[0014]
However, in the configuration like the present embodiment in which the water storage tank 11 is arranged on the side surface of the water heater 1, it is easy to replenish water from the top. For this reason, a tank lid 11a is provided at the upper part of the water storage tank 11, and the tank lid 11a is taken and supplied from the upper part at the time of replenishment. However, when water is supplied by such a method, a part of the water supply is directly applied to the tank valve 19. Since the tank valve 19 is made of soft rubber as described above, if water is repeatedly applied directly to the tank valve 19, the tank valve 19 may be damaged and may not perform its role sufficiently. Therefore, in this embodiment, a cover 20 is provided above the tank valve 19.
[0015]
In the water heater configured as described above, the water heater container 1 heats the stored water 2 to a predetermined temperature or keeps the water 2 at a predetermined temperature by a heating element 3 as a heating means attached to the bottom. The water 2 in the kettle 1 is led out of the body through the lead-out port 6 through the lead-out path 5 by a pump 4 which is a lead-out means. Reference numeral 7 denotes a lid that covers the upper opening of the kettle 1, and a steam vent 8 a is provided on the kettle side of the lid 7, and the steam generated in the kettle 1 is evacuated from the steam vent 8 a. To the outside through the steam passage 8c inside the lid body 7 and from the steam port 8b.
[0016]
A water level sensor 9 is a water level detection means, which includes three water level detection elements, a full water level detection element 9a, a water supply level detection element 9b, and a heating stop water level detection element 9c. A light receiving element is combined to detect whether or not each water level is reached.
[0017]
The full water level detecting element 9a detects whether or not the amount of water 2 in the water heater 1 is the upper limit water level A1 (first water level) of the water 2 contained in the water heater 1. The water supply level detecting element 9b detects that the amount of the water 2 has reached the water level (second water level) at which the water is heated and water supply into the container 1 is started. The heating stop water level detecting element 9c detects that the amount of water 2 has reached the lower limit water level of the water 2 contained in the kettle 1 (in this embodiment, the level just above the bottom of the kettle 1). The heating stop water level detecting element 9c stops the heating operation by the heating element 3 when the water amount of the water 2 reaches the lower limit water level in order to prevent empty watering or the like when the water supply into the kettle container 1 is not sufficient. It is provided for.
[0018]
Based on the detection signal of the water supply detection element 9b, the control unit 10 drives the water supply pump drive motor 13a when the amount of water 2 in the kettle 1 decreases to the second water level, and is magnetically coupled to the water supply pump drive motor 13a. Then, the water supply pump 13 (water supply means 12) provided in the water storage tank 11 that is interlocked is operated. When the water supply pump 13 is activated, the water 2 stored in the water storage tank 11 passes through the pumping path 14 (water supply means 12), and is poured from the pumping path outlet 14a (water supply means 12) to the water receiver 15 to receive the water. The water is discharged out of the water storage tank 11 through an inlet 16 provided at the bottom of the portion 15.
[0019]
When the water storage tank 11 is attached to the main body, the tank valve 19 urged to close the inlet 16 by the spring is lifted and the inlet 16 is opened, so the water storage tank The water 2 discharged from the 11 inlets 16 is injected into the upper end of the water supply channel 17.
[0020]
Since the supply amount per unit time of the water 2 supplied to the water receiver 15 by the water supply means 12 is larger than the discharge amount per unit time discharged from the inlet 16, the difference in the amount of water was supplied. The water 2 returns to the water storage tank 11 from the overflow portion 15a. That is, part of the water 2 in the water storage tank 11 circulates in the water storage tank 11 through the water supply means 12. As a result, the amount of water discharged from the water inlet 16 does not depend greatly on the amount of water supplied from the water supply means 12.
[0021]
As described above, when the water level in the water heater container 1 is equal to or lower than the second water level, a stable amount of water is injected into the water supply channel 17, so that a stable amount of water is supplied into the water heater container 1 from the water supply port 17 a. 2 is automatically added.
[0022]
When the full water level detecting element 9a detects that the water level of the water 2 has reached the full water level A1, the control unit 10 recognizes this and stops the driving of the water supply pump drive motor 13a. Stops and the refilling of water into the water heater 1 is stopped.
[0023]
In addition, the control method of the supply amount of the water 2 into the kettle 1 is limited to a method in which the water level is detected by the water level sensor 9 and the water supply pump 13 is driven or stopped according to the detection result as described above. For example, the required amount of water may be obtained by driving the water supply pump 13 for a required time. Further, the water receiver 15 may be integrally formed as a part of the water storage tank 11 or may be a separate part.
[0024]
Further, water is pumped by the water supply pump 13 and guided to the inlet 16, and in the middle from the pumping path 14 to the inlet 16, the water pumped in the pumping path 14 can be overflowed, so that a predetermined amount is added to the kettle 1. It becomes possible to eliminate water supply. This overflow structure can be easily obtained by providing a space open to the atmosphere between the pumping channel outlet 14 a and the water supply receiving portion 15. By providing this overflow portion, when water is supplied from the water storage tank 11 to the kettle 1, the water level sensor 9 normally detects that the water 2 has been supplied up to the full water detection 9 a and detects the position of the float 18. Even if the water level sensor 9 erroneously detects the water level due to some abnormality or the water supply pump 13 does not stop due to an abnormality of the control unit 10 or the like, when the amount of water in the kettle 1 reaches the water supply receiving unit 15 or more, Since the water 2 overflows into the water storage tank 11 from the upper end of the water supply receiving portion 15, no further water is supplied to the kettle 1.
[0025]
Further, as a method of overflowing, if a notch 15a is provided in a part of the water supply receiving part 15 and the water overflows from this part, the overflow direction becomes constant and the pumping channel outlet 14a and the water supply receiving part 15 There is no need to provide a space between them.
[0026]
Further, according to the present embodiment, the water receiving portion 15 that receives the liquid supplied by the water supply means 12 and guides the liquid to the water injection port 16 is provided, and the water receiving portion 15 can overflow the liquid into the water storage tank 11. Therefore, the difference between the supply amount of the liquid from the water supply means 12 and the liquid led out of the water storage tank 11 from the inlet 16 (that is, the flow rate of the liquid injected into the water supply path 17) Then, since it returns to the water storage tank 11, it is possible to stabilize the supply of liquid from the water supply port 17 a to the water heater container 1 by reducing the change in the amount of water supply or the effect of variation of the water supply means 12.
[0027]
Further, when the water supply pump 13 is in a continuous operation state, the water level in the kettle 1 is prevented from rising above a predetermined level by overflowing the inlet 16, and provided on the lid 7. The steam vent hole 8a is provided at a certain level above the predetermined water level, so that steam can be discharged even when the water is boiled in that state, thereby increasing the internal pressure in the kettle 1. The hot water is not spilled from the steam port 8 or the outlet port 6.
[0028]
Furthermore, the highest water level point 6b of the lead-out path 6 is provided above the steam vent hole 8a. Thus, when the steam vent hole 8a is closed with the momentum of boiling of the water 2 in the kettle container 1, the internal pressure in the kettle container 1 rises, and the kettle container 16 is placed in the inlet 16 at a position lower than the steam vent hole 8a. It is possible to prevent the water 2 in 1 from flowing backward and spilling from the outlet 6a. It is desirable to provide the highest water level point 6b of the lead-out path 6 as far as possible above the steam vent hole 8a.
[0029]
(Example 2)
A second embodiment of the present invention will be described with reference to FIG. By providing a plurality of steam vents 8a, it is difficult to block all the steam vents 8a at the same time by boiling the water 2 in the kettle 1 so that a steam passage is secured and the internal pressure in the kettle 1 is maintained. Can be prevented from rising and spilling from the outlet port 6a or the steam port 8b provided in the lid 7. Although it is more difficult to spill the steam vent hole 8a as much as possible, at the same time, the heat in the kettle 1 is likely to flow out of the steam vent hole 8a and the heat insulation efficiency is deteriorated, so that the size of the steam vent hole 8a is reduced. The number is preferably about 4 to 8 with a diameter of about 5 mm.
[0030]
【The invention's effect】
As described above, according to the present invention, with a simple configuration, even when the water supply pump is in a continuous operation state, the water level in the main body container does not rise above a certain level, It is possible to provide an electric water heater that prevents the internal pressure in the water heater container from increasing and prevents hot water from spilling from the steam port or the hot water outlet.
[Brief description of the drawings]
FIG. 1 is a sectional view of an electric water heater in Embodiment 1 of the present invention. FIG. 2 is a sectional view of an electric water heater in Embodiment 2 of the present invention.
1 Water heater 2 Water 3 Heating means (heating element)
4 Pump (hot water supply means)
6 Lead-out path 6a Lead-out port 6b Maximum water level point 7 Lid 8a Steam vent 8b Steam port 8c Steam passage 9 Water level sensor (water level detection means)
9a Full water level detector (first water level)
9b Water supply level detection means (second water level)
9c Heating stop water level detection element (second water level)
DESCRIPTION OF SYMBOLS 10 Control part 11 Water storage tank 12 Water supply means 13 Water supply pump (water supply means)
14 Pumping channel (water supply means)
15 Water receiving part 16 Inlet (water supply means)
17 Water supply channel 17a Water supply port

Claims (2)

A water storage tank that stores liquid; a water heater container that is provided in the main body and stores and heats the liquid; a lid that covers the top of the water heater container; a water supply path for sending the liquid in the water storage tank to the water heater container; A water supply means for supplying the liquid in the water storage tank to an inlet provided in an upper part of the water storage tank, and a lead-out path for taking out the liquid in the kettle container out of the vessel, and supplying water to the inlet A part or the whole of the liquid is led to the water supply channel and supplied into the water heater container, and a steam vent hole provided on the water heater container side of the lid is located above the overflow portion provided at the inlet. An electric water heater provided at the top and the highest water level of the outlet passage above the steam vent. The electric water heater according to claim 1, wherein a plurality of steam vent holes are provided.

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